/src/cairo/util/cairo-script/cairo-script-operators.c

Source
/*
 * Copyright © 2008 Chris Wilson <chris@chris-wilson.co.uk>
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is Chris Wilson.
 *
 * Contributor(s):
 *  Chris Wilson <chris@chris-wilson.co.uk>
 */

#include "config.h"

/* TODO real path type */

#include "cairo-script-private.h"

#if CAIRO_HAS_SCRIPT_SURFACE
#include "cairo-script.h"
#endif

#include <stdio.h> /* snprintf */
#include <stdlib.h> /* mkstemp */
#include <string.h>

#include <math.h>
#include <limits.h> /* INT_MAX */
#include <assert.h>

#if HAVE_ZLIB
#include <zlib.h>
#endif

#if HAVE_LZO
#include <lzo2a.h>
#endif

#ifdef HAVE_MMAP
# ifdef HAVE_UNISTD_H
#  include <sys/mman.h>
#  include <unistd.h>
# else
#  undef HAVE_MMAP
# endif
#endif

typedef struct _csi_proxy {
    csi_t *ctx;
    void *ptr;
    csi_dictionary_t *dictionary;
    csi_destroy_func_t destroy_func;
    void *destroy_data;
} csi_proxy_t;

typedef struct _csi_blob {
    csi_list_t list;
    unsigned long hash;
    uint8_t *bytes;
    unsigned int len;
} csi_blob_t;

static const cairo_user_data_key_t _csi_proxy_key;
static const cairo_user_data_key_t _csi_blob_key;

enum mime_type {
    MIME_TYPE_NONE = 0,
    MIME_TYPE_PNG
};

#define check(CNT) do {\
    if (_csi_unlikely (! _csi_check_ostack (ctx, (CNT)))) \
  return _csi_error (CSI_STATUS_INVALID_SCRIPT); \
} while (0)
#define pop(CNT) _csi_pop_ostack (ctx, (CNT))
#define push(OBJ) _csi_push_ostack (ctx, (OBJ))

static csi_proxy_t *
_csi_proxy_create (csi_t *ctx,
       void *ptr,
       csi_dictionary_t *dictionary,
       csi_destroy_func_t destroy_func,
       void *destroy_data)
{
    csi_proxy_t *proxy;

    proxy = _csi_slab_alloc (ctx, sizeof (csi_proxy_t));
    if (proxy == NULL)
  return NULL;

    proxy->ctx = cairo_script_interpreter_reference (ctx);
    proxy->ptr = ptr;
    proxy->destroy_func = destroy_func;
    proxy->destroy_data = destroy_data;
    proxy->dictionary = dictionary;
    if (dictionary != NULL)
  dictionary->base.ref++;

    return proxy;
}

static void
_csi_proxy_destroy (void *closure)
{
    csi_proxy_t *proxy = closure;
    csi_t *ctx = proxy->ctx;

    /* XXX this doesn't work because user_data_destroy is called too late.
     * Considering another hook into the (cairo internal) object system.
     */
    if (proxy->destroy_func != NULL)
  proxy->destroy_func (proxy->destroy_data, proxy->ptr);

    if (proxy->dictionary != NULL && --proxy->dictionary->base.ref == 0)
  csi_dictionary_free (ctx, proxy->dictionary);

    _csi_slab_free (ctx, proxy, sizeof (csi_proxy_t));
    cairo_script_interpreter_destroy (ctx);
}

static void
_csi_blob_hash (csi_blob_t *blob, const uint32_t *data, int len)
{
    unsigned long hash = blob->hash;
    /* very simple! */
    while (len--) {
  unsigned long c = *data++;
  hash *= 33;
  hash ^= c;
    }
    blob->hash = hash;
}

static csi_boolean_t
_csi_blob_equal (const csi_list_t *link, void *data)
{
    csi_blob_t *A, *B;

    A = csi_container_of (link, csi_blob_t, list);
    B = data;

    if (A->len != B->len)
  return FALSE;

    if (A->hash != B->hash)
  return FALSE;

    return memcmp (A->bytes, B->bytes, A->len) == 0;
}

static void
_csi_blob_init (csi_blob_t *blob, uint8_t *bytes, int len)
{
    blob->hash = 5381;
    blob->len = len;
    blob->bytes = bytes;
}

static csi_list_t *
_csi_list_unlink (csi_list_t *head, csi_list_t *link)
{
    if (link->next != NULL)
  link->next->prev = link->prev;
    if (link->prev != NULL)
  link->prev->next = link->next;
    else
  head = link->next;
    return head;
}

static csi_list_t *
_csi_list_prepend (csi_list_t *head, csi_list_t *link)
{
    if (head != NULL)
  head->prev = link;
    link->next = head;
    link->prev = NULL;
    return link;
}

static csi_list_t *
_csi_list_find (csi_list_t *head,
    csi_boolean_t (*predicate) (const csi_list_t *link, void *data),
    void *data)
{
    while (head != NULL) {
  if (predicate (head, data))
      return head;
  head = head->next;
    }

    return NULL;
}

static csi_status_t
_csi_ostack_get_boolean (csi_t *ctx, unsigned int i, csi_boolean_t *out)
{
    csi_object_t *obj;
    int type;

    obj = _csi_peek_ostack (ctx, i);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_BOOLEAN:
  *out = obj->datum.boolean;
  break;
    case CSI_OBJECT_TYPE_INTEGER:
  *out = !! obj->datum.integer;
  break;
    case CSI_OBJECT_TYPE_REAL:
  *out = obj->datum.real != 0.;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_integer (csi_t *ctx, unsigned int i, csi_integer_t *out)
{
    csi_object_t *obj;
    int type;

    obj = _csi_peek_ostack (ctx, i);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_BOOLEAN:
  *out = obj->datum.boolean;
  break;
    case CSI_OBJECT_TYPE_INTEGER:
  *out = obj->datum.integer;
  break;
    case CSI_OBJECT_TYPE_REAL:
  *out = obj->datum.real;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_number (csi_t *ctx, unsigned int i, double *out)
{
    csi_object_t *obj;
    int type;

    obj = _csi_peek_ostack (ctx, i);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_BOOLEAN:
  *out = obj->datum.boolean;
  break;
    case CSI_OBJECT_TYPE_INTEGER:
  *out = obj->datum.integer;
  break;
    case CSI_OBJECT_TYPE_REAL:
  *out = obj->datum.real;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    return CSI_STATUS_SUCCESS;
}

static double
_csi_object_as_real (csi_object_t *obj)
{
    int type;

    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_BOOLEAN:
  return obj->datum.boolean;
    case CSI_OBJECT_TYPE_INTEGER:
  return obj->datum.integer;
    case CSI_OBJECT_TYPE_REAL:
  return obj->datum.real;
    default:
  return 0;
    }
}

static csi_status_t
_csi_ostack_get_name (csi_t *ctx, unsigned int i, csi_name_t *out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (csi_object_get_type (obj) != CSI_OBJECT_TYPE_NAME))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.name;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_context (csi_t *ctx, unsigned int i, cairo_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (csi_object_get_type (obj) != CSI_OBJECT_TYPE_CONTEXT))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.cr;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_font_face (csi_t *ctx, unsigned int i, cairo_font_face_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (csi_object_get_type (obj) != CSI_OBJECT_TYPE_FONT))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.font_face;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_pattern (csi_t *ctx, unsigned int i, cairo_pattern_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (csi_object_get_type (obj) != CSI_OBJECT_TYPE_PATTERN))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.pattern;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_scaled_font (csi_t *ctx, unsigned int i,
           cairo_scaled_font_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely
  (csi_object_get_type (obj) != CSI_OBJECT_TYPE_SCALED_FONT))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    *out = obj->datum.scaled_font;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_surface (csi_t *ctx, unsigned int i, cairo_surface_t **out)
{
    csi_object_t *obj;
    int type;

    obj = _csi_peek_ostack (ctx, i);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  *out = cairo_get_target (obj->datum.cr);
  break;
    case CSI_OBJECT_TYPE_SURFACE:
  *out = obj->datum.surface;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_array (csi_t *ctx, unsigned int i, csi_array_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (csi_object_get_type (obj) != CSI_OBJECT_TYPE_ARRAY))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.array;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_procedure (csi_t *ctx, unsigned int i, csi_array_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (! csi_object_is_procedure (obj)))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.array;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_dictionary (csi_t *ctx, unsigned int i, csi_dictionary_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely
  (csi_object_get_type (obj) != CSI_OBJECT_TYPE_DICTIONARY))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    *out = obj->datum.dictionary;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_matrix (csi_t *ctx, unsigned int i, cairo_matrix_t *out)
{
    csi_object_t *obj;
    int type;

    obj = _csi_peek_ostack (ctx, i);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_MATRIX:
  *out = obj->datum.matrix->matrix;
  return CSI_STATUS_SUCCESS;

    case CSI_OBJECT_TYPE_ARRAY:
  if (obj->datum.array->stack.len == 6) {
      cairo_matrix_init (out,
             csi_number_get_value (&obj->datum.array->stack.objects[0]),
             csi_number_get_value (&obj->datum.array->stack.objects[1]),
             csi_number_get_value (&obj->datum.array->stack.objects[2]),
             csi_number_get_value (&obj->datum.array->stack.objects[3]),
             csi_number_get_value (&obj->datum.array->stack.objects[4]),
             csi_number_get_value (&obj->datum.array->stack.objects[5]));
      return CSI_STATUS_SUCCESS;
  }
  /* else fall through */
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
}

static csi_status_t
_csi_dictionary_get_integer (csi_t *ctx,
           csi_dictionary_t *dict,
           const char *name,
           csi_boolean_t optional,
           long *value)
{
    csi_status_t status;
    csi_object_t key, obj;
    int type;

    status = csi_name_new_static (ctx, &key, name);
    if (_csi_unlikely (status))
  return status;

    if (optional && ! csi_dictionary_has (dict, key.datum.name))
  return CSI_STATUS_SUCCESS;

    status = csi_dictionary_get (ctx, dict, key.datum.name, &obj);
    if (_csi_unlikely (status))
  return status;

    type = csi_object_get_type (&obj);
    switch (type) {
    case CSI_OBJECT_TYPE_BOOLEAN:
  *value = obj.datum.boolean;
  break;
    case CSI_OBJECT_TYPE_INTEGER:
  *value = obj.datum.integer;
  break;
    case CSI_OBJECT_TYPE_REAL:
  *value = obj.datum.real;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_dictionary_get_number (csi_t *ctx,
          csi_dictionary_t *dict,
          const char *name,
          csi_boolean_t optional,
          double *value)
{
    csi_status_t status;
    csi_object_t key, obj;

    status = csi_name_new_static (ctx, &key, name);
    if (_csi_unlikely (status))
  return status;

    if (optional && ! csi_dictionary_has (dict, key.datum.name))
  return CSI_STATUS_SUCCESS;

    status = csi_dictionary_get (ctx, dict, key.datum.name, &obj);
    if (_csi_unlikely (status))
  return status;

    *value = csi_number_get_value (&obj);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_string (csi_t *ctx, unsigned int i, csi_string_t **out)
{
    csi_object_t *obj;

    obj = _csi_peek_ostack (ctx, i);
    if (_csi_unlikely (csi_object_get_type (obj) != CSI_OBJECT_TYPE_STRING))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    *out = obj->datum.string;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_csi_ostack_get_string_constant (csi_t *ctx, unsigned int i, const char **out)
{
    csi_object_t *obj;
    int type;

    obj = _csi_peek_ostack (ctx, i);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_NAME:
  *out = (const char *) obj->datum.name;
  break;
    case CSI_OBJECT_TYPE_STRING:
  *out = obj->datum.string->string;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_do_cairo_op (csi_t *ctx, void (*op) (cairo_t *))
{
    cairo_t *cr;
    csi_status_t status;

    check (1);

    status = _csi_ostack_get_context (ctx, 0, &cr);
    if (_csi_unlikely (status))
  return status;

    op (cr);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
end_dict_construction (csi_t *ctx)
{
    csi_object_t obj;
    csi_dictionary_t *dict;
    csi_status_t status;

    status = csi_dictionary_new (ctx, &obj);
    if (_csi_unlikely (status))
  return status;

    dict = obj.datum.dictionary;
    do {
  csi_object_t *name, *value;

  check (1);

  value = _csi_peek_ostack (ctx, 0);
  if (csi_object_get_type (value) == CSI_OBJECT_TYPE_MARK) {
      pop (1);
      break;
  }

  check (2);

  name = _csi_peek_ostack (ctx, 1);
  if (_csi_unlikely
      (csi_object_get_type (name) != CSI_OBJECT_TYPE_NAME))
  {
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  }

  status = csi_dictionary_put (ctx, dict, name->datum.name, value);
  if (_csi_unlikely (status))
      return status;

  pop (2);
    } while (TRUE);

    return push (&obj);
}

static csi_status_t
end_array_construction (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    int len = 0;

    do {
  check (len + 1);

  if (csi_object_get_type (_csi_peek_ostack (ctx, len)) ==
      CSI_OBJECT_TYPE_MARK)
  {
      break;
  }

  len++;
    } while (TRUE);

    status = csi_array_new (ctx, len, &obj);
    if (_csi_unlikely (status))
  return status;

    if (len != 0) {
  csi_array_t *array;

  array = obj.datum.array;
  memcpy (array->stack.objects,
    _csi_peek_ostack (ctx, len - 1),
    sizeof (csi_object_t) * len);
  array->stack.len = len;
    }
    ctx->ostack.len -= len + 1;

    return push (&obj);
}

static csi_status_t
_alpha (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    double a;

    check (1);

    status = _csi_ostack_get_number (ctx, 0, &a);
    if (_csi_unlikely (status))
  return status;

    pop (1);

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_rgba (0, 0, 0, a);
    return push (&obj);
}

static csi_status_t
_add (csi_t *ctx)
{
    csi_object_t *A;
    csi_object_t *B;
    csi_object_type_t type_a, type_b;

    check (2);

    B = _csi_peek_ostack (ctx, 0);
    A = _csi_peek_ostack (ctx, 1);

    type_a = csi_object_get_type (A);
    if (_csi_unlikely (! (type_a == CSI_OBJECT_TYPE_INTEGER ||
          type_a == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    type_b = csi_object_get_type (B);
    if (_csi_unlikely (! (type_b == CSI_OBJECT_TYPE_INTEGER ||
          type_b == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);

    if (type_a == CSI_OBJECT_TYPE_REAL &&
  type_b == CSI_OBJECT_TYPE_REAL)
    {
  return _csi_push_ostack_real (ctx, A->datum.real + B->datum.real);

    }
    else if (type_a == CSI_OBJECT_TYPE_INTEGER &&
       type_b == CSI_OBJECT_TYPE_INTEGER)
    {
  return _csi_push_ostack_integer (ctx,
           A->datum.integer + B->datum.integer);
    }
    else
    {
  double v;

  if (type_a == CSI_OBJECT_TYPE_REAL)
      v = A->datum.real;
  else
      v = A->datum.integer;

  if (type_b == CSI_OBJECT_TYPE_REAL)
      v += B->datum.real;
  else
      v += B->datum.integer;

  return _csi_push_ostack_real (ctx, v);
    }
}

static csi_status_t
_add_color_stop (csi_t *ctx)
{
    csi_status_t status;
    double offset, r, g, b, a;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */

    check (6);

    status = _csi_ostack_get_number (ctx, 0, &a);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &b);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &g);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &r);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 4, &offset);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_pattern (ctx, 5, &pattern);
    if (_csi_unlikely (status))
  return status;

    cairo_pattern_add_color_stop_rgba (pattern, offset, r, g, b, a);

    pop (5);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_and (csi_t *ctx)
{
    csi_object_t *a, *b;
    int type;

    check (2);

    a = _csi_peek_ostack (ctx, 0);
    b = _csi_peek_ostack (ctx, 1);
    if (_csi_unlikely (csi_object_get_type (a) != csi_object_get_type (b)))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    pop (2);
    type = csi_object_get_type (a);
    switch (type) {
    case CSI_OBJECT_TYPE_INTEGER:
  return _csi_push_ostack_integer (ctx,
           a->datum.integer & b->datum.integer);
    case CSI_OBJECT_TYPE_BOOLEAN:
  return _csi_push_ostack_boolean (ctx,
           a->datum.boolean & b->datum.boolean);
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
}

static csi_status_t
_arc (csi_t *ctx)
{
    csi_status_t status;
    double x, y, r;
    double theta1, theta2;
    cairo_t *cr;

    check (6);

    status = _csi_ostack_get_number (ctx, 0, &theta2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &theta1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &r);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 4, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 5, &cr);
    if (_csi_unlikely (status))
  return status;

    /* XXX handle path object */

    cairo_arc (cr, x, y, r, theta1, theta2);
    pop (5);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_arc_negative (csi_t *ctx)
{
    csi_status_t status;
    double x, y, r;
    double theta1, theta2;
    cairo_t *cr;

    check (6);

    status = _csi_ostack_get_number (ctx, 0, &theta2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &theta1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &r);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 4, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 5, &cr);
    if (_csi_unlikely (status))
  return status;

    /* XXX handle path object */

    cairo_arc_negative (cr, x, y, r, theta1, theta2);
    pop (5);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_array (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;

    status = csi_array_new (ctx, 0, &obj);
    if (_csi_unlikely (status))
  return status;

    return push (&obj);
}

static csi_status_t
_bind_substitute (csi_t *ctx, csi_array_t *array)
{
    csi_status_t status;
    csi_integer_t i, n;
    csi_dictionary_t *dict;

    /* perform operator substitution on the executable array (procedure) */
    dict = ctx->dstack.objects[0].datum.dictionary;
    n = array->stack.len;
    for (i = 0; i < n; i++) {
  csi_object_t *obj = &array->stack.objects[i];

  if (obj->type == (CSI_OBJECT_TYPE_NAME | CSI_OBJECT_ATTR_EXECUTABLE)) {
      csi_dictionary_entry_t *entry;

      entry = _csi_hash_table_lookup (&dict->hash_table,
              (csi_hash_entry_t *)
              &obj->datum.name);
      if (entry != NULL)
    *obj = entry->value;
  } else if (csi_object_is_procedure (obj)) {
      status = _bind_substitute (ctx, obj->datum.array);
      if (_csi_unlikely (status))
    return status;
  }
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_idiom_substitute (csi_t *ctx, csi_array_t *array)
{
#if 0
    csi_status_t status;
    csi_integer_t i, j;

    /* XXX substring search, build array once then search for
     * longest matching idiom, repeat. */

    /* scan the top-most array for sequences we can pre-compile */

    /* now recurse for subroutines */
    j = array->stack.len;
    for (i = 0; i < j; i++) {
  csi_object_t *obj = &array->stack.objects[i];

  if (csi_object_is_procedure (obj)) {
      status = _idiom_substitute (ctx, obj->datum.array);
      if (_csi_unlikely (_cairo_is_error (status))
    return status;
  }
    }
#endif

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_bind (csi_t *ctx)
{
    csi_array_t *array;
    csi_status_t status;

    check (1);

    status = _csi_ostack_get_procedure (ctx, 0, &array);
    if (_csi_unlikely (status))
  return status;

    status = _bind_substitute (ctx, array);
    if (_csi_unlikely (status))
  return status;

    status = _idiom_substitute (ctx, array);
    if (_csi_unlikely (status))
  return status;

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_bitshift (csi_t *ctx)
{
    long v, shift;
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &shift);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 1, &v);
    if (_csi_unlikely (status))
  return status;

    if (shift < 0) {
  shift = -shift;
  v >>= shift;
    } else
  v <<= shift;

    pop (1);
    _csi_peek_ostack (ctx, 0)->datum.integer = v;

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_clip (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_clip);
}

static csi_status_t
_clip_preserve (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_clip_preserve);
}

static csi_status_t
_close_path (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_close_path);
}

static csi_status_t
_context (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    cairo_surface_t *surface;
    cairo_t *cr;
    csi_context_create_func_t hook;
    csi_proxy_t *proxy;

    check (1);

    status = _csi_ostack_get_surface (ctx, 0, &surface);
    if (_csi_unlikely (status))
  return status;

    hook = ctx->hooks.context_create;
    if (hook != NULL)
  cr = hook (ctx->hooks.closure, surface);
    else
  cr = cairo_create (surface);

    proxy = _csi_proxy_create (ctx, cr, NULL,
             ctx->hooks.context_destroy,
             ctx->hooks.closure);
    if (_csi_unlikely (proxy == NULL)) {
  cairo_destroy (cr);
  return _csi_error (CSI_STATUS_NO_MEMORY);
    }

    status = cairo_set_user_data (cr, &_csi_proxy_key,
          proxy, _csi_proxy_destroy);
    if (_csi_unlikely (status)) {
  _csi_proxy_destroy (proxy);
  cairo_destroy (cr);
  return status;
    }

    pop (1);
    obj.type = CSI_OBJECT_TYPE_CONTEXT;
    obj.datum.cr = cr;
    return push (&obj);
}

static csi_status_t
_copy (csi_t *ctx)
{
    csi_object_t *obj;
    int type;

    check (1);

    obj = csi_object_reference (_csi_peek_ostack (ctx, 0));
    pop (1);

    type = csi_object_get_type (obj);
    switch (type) {
  /*XXX array, string, dictionary, etc */
    case CSI_OBJECT_TYPE_INTEGER:
  {
      long i, n;

      n = obj->datum.integer;
      if (_csi_unlikely (n < 0))
    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
      check (n);

      for (i = n; i--; ) {
    csi_status_t status;

    status = _csi_push_ostack_copy (ctx,
            _csi_peek_ostack (ctx, n-1));
    if (_csi_unlikely (status))
        return status;
      }
      break;
  }
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_copy_page (csi_t *ctx)
{
    csi_object_t *obj;
    int type;

    check (1);

    obj = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_copy_page (obj->datum.cr);
  if (ctx->hooks.copy_page != NULL)
      ctx->hooks.copy_page (ctx->hooks.closure, obj->datum.cr);
  break;
    case CSI_OBJECT_TYPE_SURFACE:
  cairo_surface_copy_page (obj->datum.surface);
  /* XXX hook? */
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_curve_to (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *obj;
    int type;
    double x1, y1;
    double x2, y2;
    double x3, y3;

    check (7);

    status = _csi_ostack_get_number (ctx, 0, &y3);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x3);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &y2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &x2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 4, &y1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 5, &x1);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 6);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_curve_to (obj->datum.cr, x1, y1, x2, y2, x3, y3);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  cairo_mesh_pattern_curve_to (obj->datum.pattern,
             x1, y1, x2, y2, x3, y3);
  break;
  /* XXX handle path object */
    }

    pop (6);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_cvi (csi_t *ctx)
{
    csi_object_t *val, obj;
    int type;

    check (1);

    val = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (val);
    switch (type) {
    case CSI_OBJECT_TYPE_INTEGER:
  return CSI_STATUS_SUCCESS;

    case CSI_OBJECT_TYPE_REAL:
  pop (1);
  return _csi_push_ostack_integer (ctx, val->datum.real);

    case CSI_OBJECT_TYPE_STRING:
  if (! _csi_parse_number (&obj,
         val->datum.string->string,
         val->datum.string->len))
  {
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  }

  pop (1);
  if (csi_object_get_type (&obj) == CSI_OBJECT_TYPE_INTEGER)
      return push (&obj);
  else
      return _csi_push_ostack_integer (ctx, obj.datum.real);

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
}

static csi_status_t
_cvr (csi_t *ctx)
{
    csi_object_t *val, obj;
    int type;

    check (1);

    val = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (val);
    switch (type) {
    case CSI_OBJECT_TYPE_REAL:
  return CSI_STATUS_SUCCESS;

    case CSI_OBJECT_TYPE_INTEGER:
  pop (1);
  return _csi_push_ostack_real (ctx, val->datum.integer);

    case CSI_OBJECT_TYPE_STRING:
  if (! _csi_parse_number (&obj,
         val->datum.string->string,
         val->datum.string->len))
  {
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  }

  pop (1);
  if (csi_object_get_type (&obj) == CSI_OBJECT_TYPE_REAL)
      return push (&obj);
  else
      return _csi_push_ostack_real (ctx, obj.datum.integer);

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
}

static csi_status_t
_def (csi_t *ctx)
{
    csi_name_t name = 0; /* silence the compiler */
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_name (ctx, 1, &name);
    if (_csi_unlikely (status))
  return status;

    status = _csi_name_define (ctx, name, _csi_peek_ostack (ctx, 0));
    if (_csi_unlikely (status))
  return status;

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_dict (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;

    status = csi_dictionary_new (ctx, &obj);
    if (_csi_unlikely (status))
  return status;

    return push (&obj);
}

static csi_status_t
_div (csi_t *ctx)
{
    csi_object_t *A;
    csi_object_t *B;
    csi_object_type_t type_a, type_b;

    check (2);

    B = _csi_peek_ostack (ctx, 0);
    A = _csi_peek_ostack (ctx, 1);

    type_a = csi_object_get_type (A);
    if (_csi_unlikely (! (type_a == CSI_OBJECT_TYPE_INTEGER ||
          type_a == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    type_b = csi_object_get_type (B);
    if (_csi_unlikely (! (type_b == CSI_OBJECT_TYPE_INTEGER ||
          type_b == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);

    if (type_a == CSI_OBJECT_TYPE_REAL &&
  type_b == CSI_OBJECT_TYPE_REAL)
    {
  return _csi_push_ostack_real (ctx, A->datum.real / B->datum.real);

    }
    else if (type_a == CSI_OBJECT_TYPE_INTEGER &&
       type_b == CSI_OBJECT_TYPE_INTEGER)
    {
  return _csi_push_ostack_integer (ctx,
           A->datum.integer / B->datum.integer);
    }
    else
    {
  double v;

  if (type_a == CSI_OBJECT_TYPE_REAL)
      v = A->datum.real;
  else
      v = A->datum.integer;

  if (type_b == CSI_OBJECT_TYPE_REAL)
      v /= B->datum.real;
  else
      v /= B->datum.integer;

  return _csi_push_ostack_real (ctx, v);
    }
}

static csi_status_t
_duplicate (csi_t *ctx)
{
    check (1);

    return _csi_push_ostack_copy (ctx, _csi_peek_ostack (ctx, 0));
}

static csi_status_t
_eq (csi_t *ctx)
{
    csi_object_t *a, *b;
    csi_boolean_t v;

    check (2);

    b = _csi_peek_ostack (ctx, 0);
    a = _csi_peek_ostack (ctx, 1);

    v = csi_object_eq (a, b);

    pop (2);
    return _csi_push_ostack_boolean (ctx, v);
}

static csi_status_t
_exch (csi_t *ctx)
{
    return _csi_stack_exch (&ctx->ostack);
}

static csi_status_t
_false (csi_t *ctx)
{
    return _csi_push_ostack_boolean (ctx, FALSE);
}

static csi_status_t
_fill (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_fill);
}

static csi_status_t
_fill_preserve (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_fill_preserve);
}

static csi_status_t
_filter (csi_t *ctx)
{
    csi_object_t *src;
    csi_dictionary_t *dict = NULL;
    csi_status_t status;
    const char *name = NULL; /* silence the compiler */
    const struct filters {
  const char *name;
  csi_status_t (*constructor) (csi_t *t,
               csi_object_t *,
               csi_dictionary_t *,
               csi_object_t *);
    } filters[] = {
  { "ascii85", csi_file_new_ascii85_decode },
#if HAVE_ZLIB
  { "deflate", csi_file_new_deflate_decode },
#endif
#if 0
  { "lzw", csi_file_new_lzw_decode },
#endif
  { NULL, NULL }
    }, *filter;
    int cnt;

    check (2);

    status = _csi_ostack_get_string_constant (ctx, 0, &name);
    if (_csi_unlikely (status))
  return status;

    src = _csi_peek_ostack (ctx, 1);
    cnt = 2;
    if (csi_object_get_type (src) == CSI_OBJECT_TYPE_DICTIONARY) {
  dict = src->datum.dictionary;

  check (3);

  src = _csi_peek_ostack (ctx, 2);
  cnt = 3;
    }

    for (filter = filters; filter->name != NULL; filter++) {
  if (strcmp (name, filter->name) == 0) {
      csi_object_t file;

      status = filter->constructor (ctx, &file, dict, src);
      if (_csi_unlikely (status))
    return status;

      pop (cnt);
      return push (&file);
  }
    }

    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
}

static cairo_status_t
_type3_init (cairo_scaled_font_t *scaled_font,
       cairo_t *cr,
       cairo_font_extents_t *metrics)
{
    cairo_font_face_t *face;
    csi_proxy_t *proxy;
    csi_t *ctx;
    csi_dictionary_t *font;
    csi_object_t key;
    csi_object_t obj;
    csi_array_t *array;
    csi_status_t status;

    face = cairo_scaled_font_get_font_face (scaled_font);
    proxy = cairo_font_face_get_user_data (face, &_csi_proxy_key);
    if (_csi_unlikely (proxy == NULL))
  return CAIRO_STATUS_NO_MEMORY;

    ctx = proxy->ctx;
    font = proxy->dictionary;

    status = csi_name_new_static (ctx, &key, "metrics");
    if (_csi_unlikely (status))
  return CAIRO_STATUS_NO_MEMORY;

    if (! csi_dictionary_has (font, key.datum.name))
  return CAIRO_STATUS_SUCCESS;

    status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
    if (_csi_unlikely (status))
  return status;

    if (csi_object_get_type (&obj) != CSI_OBJECT_TYPE_ARRAY)
  return CAIRO_STATUS_USER_FONT_ERROR;

    array = obj.datum.array;
    if (array->stack.len != 5)
  return CAIRO_STATUS_USER_FONT_ERROR;

    metrics->ascent  = csi_number_get_value (&array->stack.objects[0]);
    metrics->descent = csi_number_get_value (&array->stack.objects[1]);
    metrics->height  = csi_number_get_value (&array->stack.objects[2]);
    metrics->max_x_advance = csi_number_get_value (&array->stack.objects[3]);
    metrics->max_y_advance = csi_number_get_value (&array->stack.objects[4]);

    return CAIRO_STATUS_SUCCESS;
}

static cairo_status_t
_type3_lookup (cairo_scaled_font_t *scaled_font,
         unsigned long unicode,
         unsigned long *glyph)
{
    cairo_font_face_t *face;
    csi_proxy_t *proxy;
    csi_t *ctx;
    csi_dictionary_t *font;
    csi_object_t obj, key;
    csi_array_t *array;
    char buf[12];
    csi_integer_t i;
    cairo_status_t status;

    face = cairo_scaled_font_get_font_face (scaled_font);
    proxy = cairo_font_face_get_user_data (face, &_csi_proxy_key);
    if (_csi_unlikely (proxy == NULL))
  return CAIRO_STATUS_USER_FONT_ERROR;

    ctx = proxy->ctx;
    font = proxy->dictionary;

    status = csi_name_new_static (ctx, &key, "encoding");
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    if (! csi_dictionary_has (font, key.datum.name)) {
  *glyph = unicode;
  return CAIRO_STATUS_SUCCESS;
    }

    status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    if (_csi_unlikely (csi_object_get_type (&obj) != CSI_OBJECT_TYPE_ARRAY))
  return CAIRO_STATUS_USER_FONT_ERROR;

    snprintf (buf, sizeof (buf), "uni%04lu", unicode);
    array = obj.datum.array;
    for (i = 0; i < array->stack.len; i++) {
  csi_object_t *name;

  name = &array->stack.objects[i];
  if (csi_object_get_type (name) != CSI_OBJECT_TYPE_NAME)
      continue;

  if (strcmp ((char *) name->datum.name, buf) == 0) {
      *glyph = i;
      return CAIRO_STATUS_SUCCESS;
  }
    }

    return CAIRO_STATUS_USER_FONT_ERROR;
}

static cairo_status_t
_type3_render (cairo_scaled_font_t *scaled_font,
         unsigned long glyph_index,
         cairo_t *cr,
         cairo_text_extents_t *metrics)
{
    cairo_font_face_t *face;
    csi_proxy_t *proxy;
    csi_t *ctx;
    csi_dictionary_t *font;
    csi_array_t *glyphs;
    csi_object_t *glyph;
    csi_object_t key;
    csi_object_t obj;
    csi_object_t render;
    csi_status_t status;

    face = cairo_scaled_font_get_font_face (scaled_font);
    proxy = cairo_font_face_get_user_data (face, &_csi_proxy_key);
    if (_csi_unlikely (proxy == NULL))
  return CAIRO_STATUS_USER_FONT_ERROR;

    ctx = proxy->ctx;
    font = proxy->dictionary;

    status = csi_name_new_static (ctx, &key, "glyphs");
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    if (_csi_unlikely (csi_object_get_type (&obj) != CSI_OBJECT_TYPE_ARRAY))
  return CAIRO_STATUS_USER_FONT_ERROR;

    glyphs = obj.datum.array;
    glyph = &glyphs->stack.objects[glyph_index];
    if (csi_object_get_type (glyph) == CSI_OBJECT_TYPE_NULL)
  return CAIRO_STATUS_SUCCESS; /* .notdef */

    if (_csi_unlikely (csi_object_get_type (glyph) != CSI_OBJECT_TYPE_DICTIONARY))
  return CAIRO_STATUS_USER_FONT_ERROR;

    status = csi_name_new_static (ctx, &key, "metrics");
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    font = glyph->datum.dictionary;
    if (csi_dictionary_has (font, key.datum.name)) {
  csi_array_t *array;

  status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return CAIRO_STATUS_USER_FONT_ERROR;

  if (_csi_unlikely (csi_object_get_type (&obj) !=
           CSI_OBJECT_TYPE_ARRAY))
      return CAIRO_STATUS_USER_FONT_ERROR;

  array = obj.datum.array;
  if (_csi_unlikely (array->stack.len != 6))
      return CAIRO_STATUS_USER_FONT_ERROR;

  metrics->x_bearing = csi_number_get_value (&array->stack.objects[0]);
  metrics->y_bearing = csi_number_get_value (&array->stack.objects[1]);
  metrics->width = csi_number_get_value (&array->stack.objects[2]);
  metrics->height = csi_number_get_value (&array->stack.objects[3]);
  metrics->x_advance = csi_number_get_value (&array->stack.objects[4]);
  metrics->y_advance = csi_number_get_value (&array->stack.objects[5]);
    }

    status = csi_name_new_static (ctx, &key, "render");
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    status = csi_dictionary_get (ctx, font, key.datum.name, &render);
    if (_csi_unlikely (status))
  return CAIRO_STATUS_USER_FONT_ERROR;

    if (_csi_unlikely (! csi_object_is_procedure (&render)))
  return CAIRO_STATUS_USER_FONT_ERROR;

    obj.type = CSI_OBJECT_TYPE_CONTEXT;
    obj.datum.cr = cairo_reference (cr);
    status = push (&obj);
    if (_csi_unlikely (status)) {
  cairo_destroy (cr);
  return CAIRO_STATUS_USER_FONT_ERROR;
    }

    status = csi_object_execute (ctx, &render);
    pop (1);
    return status ? CAIRO_STATUS_USER_FONT_ERROR : CAIRO_STATUS_SUCCESS;
}

static csi_status_t
_font_type3 (csi_t *ctx,
       csi_dictionary_t *font,
       cairo_font_face_t **font_face_out)
{
    cairo_font_face_t *font_face;

    font_face = cairo_user_font_face_create ();
    cairo_user_font_face_set_init_func (font_face, _type3_init);
    cairo_user_font_face_set_unicode_to_glyph_func (font_face, _type3_lookup);
    cairo_user_font_face_set_render_glyph_func (font_face, _type3_render);

    *font_face_out = font_face;
    return CSI_STATUS_SUCCESS;
}

#if CAIRO_HAS_FT_FONT
#include <cairo-ft.h>
#include <ft2build.h>
#include FT_FREETYPE_H

static FT_Library _ft_lib;

struct _ft_face_data {
    csi_t *ctx;
    csi_blob_t blob;
    FT_Face face;
    csi_string_t *source;
    void *bytes;
    cairo_font_face_t *font_face;
};

static void
_ft_done_face (void *closure)
{
    struct _ft_face_data *data = closure;
    csi_t *ctx;

    ctx = data->ctx;

    if (data->face != NULL)
  FT_Done_Face (data->face);

    ctx->_faces = _csi_list_unlink (ctx->_faces, &data->blob.list);

    if (data->source != NULL) {
  if (--data->source->base.ref == 0)
      csi_string_free (ctx, data->source);
    } else {
#ifdef HAVE_MMAP
  munmap (data->blob.bytes, data->blob.len);
#endif
    }

    if (data->bytes != NULL)
  _csi_free (ctx, data->bytes);

    _csi_slab_free (ctx, data, sizeof (*data));

    cairo_script_interpreter_destroy (ctx);
}

struct mmap_vec {
    const uint8_t *bytes;
    size_t num_bytes;
};

#ifdef HAVE_MMAP
/* manual form of swapping for swapless systems like tiny */
static void *
_mmap_bytes (const struct mmap_vec *vec, int count)
{
    char template[] = "/tmp/csi-font.XXXXXX";
    void *ptr;
    int fd;
    int num_bytes;

    fd = mkstemp (template);
    if (fd == -1)
  return MAP_FAILED;

    unlink (template);
    num_bytes = 0;
    while (count--) {
  const uint8_t *bytes = vec->bytes;
  size_t len = vec->num_bytes;
  while (len) {
      int ret = write (fd, bytes, len);
      if (ret < 0) {
    close (fd);
    return MAP_FAILED;
      }
      len -= ret;
      bytes += ret;
  }

  num_bytes += vec->num_bytes;
  vec++;
    }

    ptr = mmap (NULL, num_bytes, PROT_READ, MAP_SHARED, fd, 0);
    close (fd);

    return ptr;
}
#endif

static void *
inflate_string (csi_t *ctx, csi_string_t *src)
{
    uint8_t *bytes;

    bytes = _csi_alloc (ctx, src->deflate + 1);
    if (bytes == NULL)
  return NULL;

    switch (src->method) {
    case ZLIB:
    {
#if HAVE_ZLIB
        uLongf length = src->deflate;
  if (uncompress ((Bytef *) bytes, &length,
      (Bytef *) src->string, src->len) == Z_OK)
  {
            bytes[length] = '\0';
            return bytes;
  }
#endif
  break;
    }
    case LZO:
    {
#if HAVE_LZO
        lzo_uint length = src->deflate;
  if (lzo2a_decompress ((Bytef *) src->string, src->len,
            (Bytef *) bytes, &length,
            NULL) == LZO_E_OK)
  {
            bytes[length] = '\0';
            return bytes;
  }
#endif
  break;
    }
    case NONE:
    default:
        break;
    }

    _csi_free (ctx, bytes);
    return NULL;
}

static csi_status_t
_ft_create_for_source (csi_t *ctx,
           csi_string_t *source,
           int index, int load_flags,
           cairo_font_face_t **font_face_out)
{
    csi_blob_t tmpl;
    struct _ft_face_data *data;
    csi_list_t *link;
    FT_Error err;
    cairo_font_face_t *font_face;
    csi_status_t status;
    struct mmap_vec vec[2];
    int vec_count;
    void *bytes;
    int len;

    /* check for an existing FT_Face (kept alive by the font cache) */
    /* XXX index/flags */
    _csi_blob_init (&tmpl, (uint8_t *) source->string, source->len);
    _csi_blob_hash (&tmpl, (uint32_t *) source->string, source->len / sizeof (uint32_t));
    link = _csi_list_find (ctx->_faces, _csi_blob_equal, &tmpl);
    if (link) {
  if (--source->base.ref == 0)
      csi_string_free (ctx, source);
  data = csi_container_of (link, struct _ft_face_data, blob.list);
  *font_face_out = cairo_font_face_reference (data->font_face);
  return CSI_STATUS_SUCCESS;
    }

    /* no existing font_face, create new FT_Face */
    if (_ft_lib == NULL) {
  err = FT_Init_FreeType (&_ft_lib);
  if (_csi_unlikely (err != FT_Err_Ok))
      return _csi_error (CSI_STATUS_NO_MEMORY);
    }

    data = _csi_slab_alloc (ctx, sizeof (*data));
    data->bytes = NULL;
    data->source = source;

    vec[0].bytes = tmpl.bytes;
    vec[0].num_bytes = tmpl.len;

    if (source->deflate) {
  len = source->deflate;
  bytes = inflate_string (ctx, source);
  if (_csi_unlikely (bytes == NULL))
      return _csi_error (CSI_STATUS_NO_MEMORY);

  vec[1].bytes = bytes;
  vec[1].num_bytes = len;
  data->bytes = bytes;
  vec_count = 2;
    } else {
  bytes = tmpl.bytes;
  len = tmpl.len;
  vec_count = 1;
    }

    data->face = NULL;
    ctx->_faces = _csi_list_prepend (ctx->_faces, &data->blob.list);
    data->ctx = cairo_script_interpreter_reference (ctx);
    data->blob.hash = tmpl.hash;
    data->blob.len = tmpl.len;
#ifdef HAVE_MMAP
    data->blob.bytes = _mmap_bytes (vec, vec_count);
    if (data->blob.bytes != MAP_FAILED) {
  if (--source->base.ref == 0)
      csi_string_free (ctx, source);

  if (source->deflate) {
      _csi_free (ctx, bytes);
      bytes = data->blob.bytes + vec[0].num_bytes;
  } else
      bytes = data->blob.bytes;

  data->source = NULL;
  data->bytes = NULL;
    } else {
  data->blob.bytes = tmpl.bytes;
    }
#else
    data->blob.bytes = tmpl.bytes;
#endif

    err = FT_New_Memory_Face (_ft_lib,
            bytes, len,
            index,
            &data->face);
    if (_csi_unlikely (err != FT_Err_Ok)) {
  _ft_done_face (data);

  if (err == FT_Err_Out_Of_Memory)
      return _csi_error (CSI_STATUS_NO_MEMORY);

  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    font_face = cairo_ft_font_face_create_for_ft_face (data->face, load_flags);
    status = cairo_font_face_set_user_data (font_face,
              &_csi_blob_key,
              data, _ft_done_face);
    if (_csi_unlikely (status)) {
  _ft_done_face (data);
  cairo_font_face_destroy (font_face);
  return status;
    }

    data->font_face = font_face;
    *font_face_out = font_face;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_ft_create_for_pattern (csi_t *ctx,
      csi_string_t *string,
      cairo_font_face_t **font_face_out)
{
#if CAIRO_HAS_FC_FONT
    csi_blob_t tmpl;
    struct _ft_face_data *data;
    csi_list_t *link;
    cairo_font_face_t *font_face;
    FcPattern *pattern, *resolved;
    csi_status_t status;
    struct mmap_vec vec;
    void *bytes;

    _csi_blob_init (&tmpl, (uint8_t *) string->string, string->len);
    _csi_blob_hash (&tmpl, (uint32_t *) string->string, string->len / sizeof (uint32_t));
    link = _csi_list_find (ctx->_faces, _csi_blob_equal, &tmpl);
    if (link) {
  if (--string->base.ref == 0)
      csi_string_free (ctx, string);
  data = csi_container_of (link, struct _ft_face_data, blob.list);
  *font_face_out = cairo_font_face_reference (data->font_face);
  return CSI_STATUS_SUCCESS;
    }

    if (string->deflate) {
  bytes = inflate_string (ctx, string);
  if (_csi_unlikely (bytes == NULL))
      return _csi_error (CSI_STATUS_NO_MEMORY);
    } else {
  bytes = tmpl.bytes;
    }

    pattern = FcNameParse (bytes);
    if (!pattern)
    {
      /* Fontconfig's representation of charset changed mid 2014;
       * We used to record charset before that.  Remove everything
       * after charset if that's present, and try again.  */
      char *s = strstr ((char *) bytes, ":charset=");
      if (s)
      {
  *s = '\0';
  pattern = FcNameParse (bytes);
      }
    }
    if (bytes != tmpl.bytes)
  _csi_free (ctx, bytes);

retry:
    resolved = pattern;
    if (cairo_version () < CAIRO_VERSION_ENCODE (1, 9, 0)) {
  /* prior to 1.9, you needed to pass a resolved pattern */
  resolved = FcFontMatch (NULL, pattern, NULL);
  if (_csi_unlikely (resolved == NULL)) {
      FcPatternDestroy (pattern);
      return _csi_error (CSI_STATUS_NO_MEMORY);
  }
    }

    font_face = cairo_ft_font_face_create_for_pattern (resolved);
    if (resolved != pattern)
  FcPatternDestroy (resolved);

    if (cairo_font_face_status (font_face)) {
  char *filename = NULL;

  /* Try a manual fallback process by eliminating specific requests */

  if (FcPatternGetString (pattern,
        FC_FILE, 0,
        (FcChar8 **) &filename) == FcResultMatch) {
      FcPatternDel (pattern, FC_FILE);
      goto retry;
  }
    }

    FcPatternDestroy (pattern);

    data = _csi_slab_alloc (ctx, sizeof (*data));
    ctx->_faces = _csi_list_prepend (ctx->_faces, &data->blob.list);
    data->ctx = cairo_script_interpreter_reference (ctx);
    data->blob.hash = tmpl.hash;
    data->blob.len = tmpl.len;
    data->bytes = NULL;
    data->face = NULL;
#ifdef HAVE_MMAP
    vec.bytes = tmpl.bytes;
    vec.num_bytes = tmpl.len;
    data->blob.bytes = _mmap_bytes (&vec, 1);
    if (data->blob.bytes != MAP_FAILED) {
  data->source = NULL;
  if (--string->base.ref == 0)
      csi_string_free (ctx, string);
    } else {
  data->blob.bytes = tmpl.bytes;
  data->source = string;
    }
#else
    data->blob.bytes = tmpl.bytes;
    data->source = string;
#endif

    status = cairo_font_face_set_user_data (font_face,
              &_csi_blob_key,
              data, _ft_done_face);
    if (_csi_unlikely (status)) {
  _ft_done_face (data);
  cairo_font_face_destroy (font_face);
  return status;
    }

    data->font_face = font_face;
    *font_face_out = font_face;
    return CSI_STATUS_SUCCESS;
#else
    if (--string->base.ref == 0)
  csi_string_free (ctx, string);
    return CSI_INT_STATUS_UNSUPPORTED;
#endif
}

static csi_status_t
_ft_type42_create (csi_t *ctx,
       csi_dictionary_t *font,
       cairo_font_face_t **font_face_out)
{
    csi_object_t key;
    csi_status_t status;

    /* two basic sub-types, either an FcPattern or embedded font */
    status = csi_name_new_static (ctx, &key, "pattern");
    if (_csi_unlikely (status))
  return status;

    if (csi_dictionary_has (font, key.datum.name)) {
  csi_object_t obj;
  int type;

  status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return status;

  type = csi_object_get_type (&obj);
  switch (type) {
  case CSI_OBJECT_TYPE_FILE:
      status = _csi_file_as_string (ctx, obj.datum.file, &obj);
      if (_csi_unlikely (status))
    return status;
      break;
  case CSI_OBJECT_TYPE_STRING:
      obj.datum.object->ref++;
      break;
  default:
      return  _csi_error (CSI_STATUS_INVALID_SCRIPT);
  }

  return _ft_create_for_pattern (ctx,
               obj.datum.string,
               font_face_out);
    }

    status = csi_name_new_static (ctx, &key, "source");
    if (_csi_unlikely (status))
  return status;

    if (csi_dictionary_has (font, key.datum.name)) {
  csi_object_t obj;
  long index, flags;
  int type;

  index = 0;
  status = _csi_dictionary_get_integer (ctx, font, "index", TRUE, &index);
  if (_csi_unlikely (status))
      return status;

  flags = 0;
  status = _csi_dictionary_get_integer (ctx, font, "flags", TRUE, &flags);
  if (_csi_unlikely (status))
      return status;

  status = csi_name_new_static (ctx, &key, "source");
  if (_csi_unlikely (status))
      return status;
  status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return status;
  type = csi_object_get_type (&obj);
  switch (type) {
  case CSI_OBJECT_TYPE_FILE:
      status = _csi_file_as_string (ctx, obj.datum.file, &obj);
      if (_csi_unlikely (status))
    return status;
      break;
  case CSI_OBJECT_TYPE_STRING:
      obj.datum.object->ref++;
      break;
  default:
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  }

  return _ft_create_for_source (ctx, obj.datum.string,
              index, flags,
              font_face_out);
    }

    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
}
#else
#define _ft_type42_create(ctx, font, face_out) CSI_INT_STATUS_UNSUPPORTED
#endif

static char *
_fc_strcpy (csi_t *ctx, const char *str)
{
    char *ret;
    int len;

    ret = strchr (str, ':');
    if (ret != NULL)
  len = ret - str;
    else
  len = strlen (str);

    ret = _csi_alloc (ctx, len+1);
    if (_csi_unlikely (ret == NULL))
  return NULL;

    memcpy (ret, str, len);
    ret[len] = '\0';

    return ret;
}

static cairo_font_face_t *
_select_font (const char *name)
{
    cairo_surface_t *surface;
    cairo_font_face_t *face;
    cairo_t *cr;

    /* create a dummy context to choose a font */
    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 0, 0);
    cr = cairo_create (surface);
    cairo_surface_destroy (surface);

    cairo_select_font_face (cr, name,
          CAIRO_FONT_SLANT_NORMAL,
          CAIRO_FONT_WEIGHT_NORMAL);
    face = cairo_font_face_reference (cairo_get_font_face (cr));
    cairo_destroy (cr);

    return face;
}

static csi_status_t
_ft_fallback_create_for_pattern (csi_t *ctx,
         csi_string_t *string,
         cairo_font_face_t **font_face_out)
{
    char *str, *name;

    str = string->string;
#if 0
    name = strstr (str, "fullname=");
    if (name != NULL)
  str = name + 9;
#endif

    name = _fc_strcpy (ctx, str);
    if (_csi_unlikely (name == NULL))
  return _csi_error (CSI_STATUS_NO_MEMORY);

    *font_face_out = _select_font (name);
    _csi_free (ctx, name);

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_ft_type42_fallback_create (csi_t *ctx,
          csi_dictionary_t *font,
          cairo_font_face_t **font_face_out)
{
    csi_object_t key;
    csi_status_t status;

    /* attempt to select a similar font */

    /* two basic sub-types, either an FcPattern or embedded font */
    status = csi_name_new_static (ctx, &key, "pattern");
    if (_csi_unlikely (status))
  return status;

    if (csi_dictionary_has (font, key.datum.name)) {
  csi_object_t obj;
  int type;

  status = csi_dictionary_get (ctx, font, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return status;

  type = csi_object_get_type (&obj);
  switch (type) {
  case CSI_OBJECT_TYPE_FILE:
      status = _csi_file_as_string (ctx, obj.datum.file, &obj);
      if (_csi_unlikely (status))
    return status;
      break;
  case CSI_OBJECT_TYPE_STRING:
      obj.datum.object->ref++;
      break;
  default:
      return  _csi_error (CSI_STATUS_INVALID_SCRIPT);
  }

  return _ft_fallback_create_for_pattern (ctx,
            obj.datum.string,
            font_face_out);
    }

    /* XXX: enable the trace to run */
    *font_face_out = _select_font ("Sans");
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_font_type42 (csi_t *ctx, csi_dictionary_t *font, cairo_font_face_t **font_face)
{
    csi_status_t status;

    status = _ft_type42_create (ctx, font, font_face);
    if (_csi_likely (status != CSI_INT_STATUS_UNSUPPORTED))
  return status;

    return _ft_type42_fallback_create (ctx, font, font_face);
}

static csi_status_t
_font (csi_t *ctx)
{
    csi_dictionary_t *font;
    csi_status_t status;
    cairo_font_face_t *font_face = NULL; /* silence the compiler */
    csi_proxy_t *proxy;
    csi_object_t obj;
    long type;

    check (1);

    status = _csi_ostack_get_dictionary (ctx, 0, &font);
    if (_csi_unlikely (status))
  return status;

    status = _csi_dictionary_get_integer (ctx, font, "type", FALSE, &type);
    if (_csi_unlikely (status))
  return status;

    switch (type) {
    case 3:
  status = _font_type3 (ctx, font, &font_face);
  break;
    case 42:
  status = _font_type42 (ctx, font, &font_face);
  break;
    default:
  status = _csi_error (CSI_STATUS_INVALID_SCRIPT);
  break;
    }

    if (_csi_unlikely (status))
  return status;

    /* transfer ownership of dictionary to cairo_font_face_t */
    proxy = _csi_proxy_create (ctx, font_face, font, NULL, NULL);
    if (_csi_unlikely (proxy == NULL)) {
  cairo_font_face_destroy (font_face);
  return _csi_error (CSI_STATUS_NO_MEMORY);
    }

    status = cairo_font_face_set_user_data (font_face,
              &_csi_proxy_key,
              proxy, _csi_proxy_destroy);
    if (_csi_unlikely (status)) {
  _csi_proxy_destroy (proxy);
  cairo_font_face_destroy (font_face);
  return status;
    }

    obj.type = CSI_OBJECT_TYPE_FONT;
    obj.datum.font_face = font_face;

    pop (1);
    status = push (&obj);
    if (_csi_unlikely (status)) {
  cairo_font_face_destroy (font_face);
  return status;
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_for (csi_t *ctx)
{
    csi_array_t *proc;
    csi_status_t status;
    long i, inc, limit;

    check (4);

    status = _csi_ostack_get_procedure (ctx, 0, &proc);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 1, &limit);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 2, &inc);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 3, &i);
    if (_csi_unlikely (status))
  return status;

    proc->base.ref++;
    pop (4);

    for (; i <= limit; i += inc) {
  status = _csi_push_ostack_integer (ctx, i);
  if (_csi_unlikely (status))
      break;

  status = _csi_array_execute (ctx, proc);
  if (_csi_unlikely (status))
      break;
    }

    if (--proc->base.ref == 0)
  csi_array_free (ctx, proc);
    return status;
}

static csi_status_t
_ge (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *a, *b;
    int cmp;

    check (2);

    b = _csi_peek_ostack (ctx, 0);
    a = _csi_peek_ostack (ctx, 1);

    status = csi_object_compare (a, b, &cmp);
    if (_csi_unlikely (status))
  return status;

    pop (2);
    return _csi_push_ostack_boolean (ctx, cmp >= 0);
}

static csi_status_t
_proxy_get (csi_proxy_t *proxy,
      csi_name_t key)
{
    csi_object_t obj;
    csi_status_t status;

    if (_csi_unlikely (proxy == NULL || proxy->dictionary == NULL))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    status = csi_dictionary_get (proxy->ctx, proxy->dictionary, key, &obj);
    if (_csi_unlikely (status))
  return status;

    return _csi_push_ostack_copy (proxy->ctx, &obj);
}

static csi_status_t
_context_get (csi_t *ctx,
        cairo_t *cr,
        csi_name_t key)
{
    csi_status_t status;
    csi_object_t obj;

    if (strcmp ((char *) key, "current-point") == 0) {
  double x, y;

  cairo_get_current_point (cr, &x, &y);

  status = _csi_push_ostack_real (ctx, x);
  if (_csi_unlikely (status))
      return status;
  status = _csi_push_ostack_real (ctx, y);
  if (_csi_unlikely (status))
      return status;

  return CSI_STATUS_SUCCESS;
    } else if (strcmp ((char *) key, "source") == 0) {
  obj.type = CSI_OBJECT_TYPE_PATTERN;
  obj.datum.pattern = cairo_pattern_reference (cairo_get_source (cr));
    } else if (strcmp ((char *) key, "target") == 0) {
  obj.type = CSI_OBJECT_TYPE_SURFACE;
  obj.datum.surface = cairo_surface_reference (cairo_get_target (cr));
    } else if (strcmp ((char *) key, "group-target") == 0) {
  obj.type = CSI_OBJECT_TYPE_SURFACE;
  obj.datum.surface = cairo_surface_reference (cairo_get_group_target (cr));
    } else if (strcmp ((char *) key, "scaled-font") == 0) {
  obj.type = CSI_OBJECT_TYPE_SCALED_FONT;
  obj.datum.scaled_font = cairo_scaled_font_reference (cairo_get_scaled_font (cr));
    } else if (strcmp ((char *) key, "font-face") == 0) {
  obj.type = CSI_OBJECT_TYPE_FONT;
  obj.datum.font_face = cairo_font_face_reference (cairo_get_font_face (cr));
    } else
  return _proxy_get (cairo_get_user_data (cr, &_csi_proxy_key), key);

    return push (&obj);
}

static csi_status_t
_font_get (csi_t *ctx,
     cairo_font_face_t *font_face,
     csi_name_t key)
{
    return _proxy_get (cairo_font_face_get_user_data (font_face,
                  &_csi_proxy_key),
           key);
}

static csi_status_t
_pattern_get (csi_t *ctx,
        cairo_pattern_t *pattern,
        csi_name_t key)
{
    csi_status_t status;

    if (strcmp ((char *) key, "type") == 0)
  return _csi_push_ostack_integer (ctx, cairo_pattern_get_type (pattern));

    if (strcmp ((char *) key, "filter") == 0)
  return _csi_push_ostack_integer (ctx, cairo_pattern_get_filter (pattern));

    if (strcmp ((char *) key, "extend") == 0)
  return _csi_push_ostack_integer (ctx, cairo_pattern_get_extend (pattern));

    if (strcmp ((char *) key, "matrix") == 0) {
  csi_object_t obj;
  cairo_matrix_t m;

  cairo_pattern_get_matrix (pattern, &m);
  status = csi_matrix_new_from_matrix (ctx, &obj, &m);
  if (_csi_unlikely (status))
      return status;

  return push (&obj);
    }

    return _proxy_get (cairo_pattern_get_user_data (pattern, &_csi_proxy_key),
           key);
}

static csi_status_t
_scaled_font_get (csi_t *ctx,
      cairo_scaled_font_t *font,
      csi_name_t key)
{
    return _proxy_get (cairo_scaled_font_get_user_data (font, &_csi_proxy_key),
           key);
}

static csi_status_t
_surface_get (csi_t *ctx,
        cairo_surface_t *surface,
        csi_name_t key)
{
    if (strcmp ((char *) key, "type") == 0) {
  return _csi_push_ostack_integer (ctx, cairo_surface_get_type (surface));
    }

    if (strcmp ((char *) key, "content") == 0) {
  return _csi_push_ostack_integer (ctx,
           cairo_surface_get_content (surface));
    }

    return _proxy_get (cairo_surface_get_user_data (surface, &_csi_proxy_key),
           key);
}

static csi_status_t
_get (csi_t *ctx)
{
    csi_object_t *key, *src, obj;
    csi_status_t status;
    int type;

    check (2);

    key = _csi_peek_ostack (ctx, 0);
    src = _csi_peek_ostack (ctx, 1);
    pop (1);
    type = csi_object_get_type (src);
    switch (type) {
    case CSI_OBJECT_TYPE_DICTIONARY:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  status = csi_dictionary_get (ctx,
             src->datum.dictionary,
             key->datum.name,
             &obj);
  break;
    case CSI_OBJECT_TYPE_ARRAY:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_INTEGER))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  status = csi_array_get (ctx,
        src->datum.array,
        key->datum.integer,
        &obj);
  break;
#if 0
    case CSI_OBJECT_TYPE_STRING:
  status = csi_string_get (src, key, &obj);
  break;
#endif

    case CSI_OBJECT_TYPE_CONTEXT:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  return _context_get (ctx, src->datum.cr, key->datum.name);

    case CSI_OBJECT_TYPE_FONT:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  return _font_get (ctx, src->datum.font_face, key->datum.name);

    case CSI_OBJECT_TYPE_PATTERN:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  return _pattern_get (ctx, src->datum.pattern, key->datum.name);

    case CSI_OBJECT_TYPE_SCALED_FONT:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  return _scaled_font_get (ctx, src->datum.scaled_font, key->datum.name);

    case CSI_OBJECT_TYPE_SURFACE:
  if (_csi_unlikely (csi_object_get_type (key) != CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);
  return _surface_get (ctx, src->datum.surface, key->datum.name);

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    if (_csi_unlikely (status))
  return status;

    return _csi_push_ostack_copy (ctx, &obj);
}

struct glyph_advance_cache {
    csi_t *ctx;
    double glyph_advance[256][2];
    unsigned long have_glyph_advance[256];
};

static void
glyph_advance_cache_destroy (void *closure)
{
    struct glyph_advance_cache *cache = closure;
    _csi_free (cache->ctx, cache);
}

static int
_glyph_string (csi_t *ctx,
         csi_array_t *array,
         cairo_scaled_font_t *scaled_font,
         cairo_glyph_t *glyphs)
{
    struct glyph_advance_cache uncached;
    struct glyph_advance_cache *cache;
    csi_integer_t nglyphs, i, j;
    double x, y, dx;
    cairo_status_t status;

    if (cairo_scaled_font_status (scaled_font))
  return 0;

    cache = cairo_scaled_font_get_user_data (scaled_font,
               (cairo_user_data_key_t *) ctx);
    if (cache == NULL) {
  cache = _csi_alloc (ctx, sizeof (*cache));
  if (_csi_likely (cache != NULL)) {
      cache->ctx = ctx;
      memset (cache->have_glyph_advance, 0xff,
        sizeof (cache->have_glyph_advance));

      status = cairo_scaled_font_set_user_data (scaled_font,
                  (cairo_user_data_key_t *) ctx,
                  cache,
                  glyph_advance_cache_destroy);
      if (_csi_unlikely (status)) {
    _csi_free (ctx, cache);
    cache = NULL;
      }
  }
    }

    if (_csi_unlikely (cache == NULL)) {
  cache = &uncached;

  cache->ctx = ctx;
  memset (cache->have_glyph_advance, 0xff,
    sizeof (cache->have_glyph_advance));
    }

    nglyphs = 0;
    x = y = 0;
    for (i = 0; i < array->stack.len; i++) {
  const csi_object_t *obj = &array->stack.objects[i];
  int type = csi_object_get_type (obj);

  switch (type) {
  case CSI_OBJECT_TYPE_ARRAY: {
      const csi_array_t *glyph_array = obj->datum.array;
      for (j = 0; j < glyph_array->stack.len; j++) {
    unsigned long g;
    int gi;

    obj = &glyph_array->stack.objects[j];
    if (csi_object_get_type (obj) != CSI_OBJECT_TYPE_INTEGER)
        break;
    g = obj->datum.integer;

    glyphs[nglyphs].index = g;
    glyphs[nglyphs].x = x;
    glyphs[nglyphs].y = y;

    gi = g % ARRAY_LENGTH (cache->have_glyph_advance);
    if (cache->have_glyph_advance[gi] != g) {
        cairo_text_extents_t extents;

        cairo_scaled_font_glyph_extents (scaled_font,
                 &glyphs[nglyphs], 1,
                 &extents);

        cache->glyph_advance[gi][0] = extents.x_advance;
        cache->glyph_advance[gi][1] = extents.y_advance;
        cache->have_glyph_advance[gi] = g;
    }

    x += cache->glyph_advance[gi][0];
    y += cache->glyph_advance[gi][1];
    nglyphs++;
      }
      break;
  }

  case CSI_OBJECT_TYPE_STRING: {
      const csi_string_t *glyph_string = obj->datum.string;
      for (j = 0; j < glyph_string->len; j++) {
    uint8_t g;

    g = glyph_string->string[j];
    glyphs[nglyphs].index = g;
    glyphs[nglyphs].x = x;
    glyphs[nglyphs].y = y;

    if (cache->have_glyph_advance[g] != g) {
        cairo_text_extents_t extents;

        cairo_scaled_font_glyph_extents (scaled_font,
                 &glyphs[nglyphs], 1,
                 &extents);

        cache->glyph_advance[g][0] = extents.x_advance;
        cache->glyph_advance[g][1] = extents.y_advance;
        cache->have_glyph_advance[g] = g;
    }

    x += cache->glyph_advance[g][0];
    y += cache->glyph_advance[g][1];
    nglyphs++;
      }
      break;
  }

  case CSI_OBJECT_TYPE_INTEGER:
  case CSI_OBJECT_TYPE_REAL: /* dx or x*/
      dx = csi_number_get_value (obj);
      if (i+1 == array->stack.len)
    break;

      type = csi_object_get_type (&array->stack.objects[i+1]);
      switch (type) {
      case CSI_OBJECT_TYPE_INTEGER:
      case CSI_OBJECT_TYPE_REAL: /* y */
    y = csi_number_get_value (&array->stack.objects[i+1]);
    x = dx;
    i++;
    break;

      default:
    x += dx;
      }
  }
    }

    return nglyphs;
}

static csi_status_t
_glyph_path (csi_t *ctx)
{
    csi_array_t *array;
    csi_status_t status;
    cairo_t *cr;
    cairo_glyph_t stack_glyphs[256], *glyphs;
    csi_integer_t nglyphs, i;

    check (2);

    status = _csi_ostack_get_array (ctx, 0, &array);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    /* count glyphs */
    nglyphs = 0;
    for (i = 0; i < array->stack.len; i++) {
  csi_object_t *obj = &array->stack.objects[i];
  int type = csi_object_get_type (obj);
  switch (type) {
  case CSI_OBJECT_TYPE_ARRAY:
      nglyphs += obj->datum.array->stack.len;
      break;
  case CSI_OBJECT_TYPE_STRING:
      nglyphs += obj->datum.string->len;
      break;
  }
    }
    if (nglyphs == 0) {
  pop (1);
  return CSI_STATUS_SUCCESS;
    }

    if (nglyphs > ARRAY_LENGTH (stack_glyphs)) {
  if (_csi_unlikely ((unsigned) nglyphs >= INT_MAX / sizeof (cairo_glyph_t)))
      return _csi_error (CSI_STATUS_NO_MEMORY);

  glyphs = _csi_alloc (ctx, sizeof (cairo_glyph_t) * nglyphs);
  if (_csi_unlikely (glyphs == NULL))
      return _csi_error (CSI_STATUS_NO_MEMORY);
    } else
  glyphs = stack_glyphs;

    nglyphs = _glyph_string (ctx, array, cairo_get_scaled_font (cr), glyphs);
    cairo_glyph_path (cr, glyphs, nglyphs);

    if (glyphs != stack_glyphs)
  _csi_free (ctx, glyphs);

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_gray (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    double g;

    check (1);

    status = _csi_ostack_get_number (ctx, 0, &g);
    if (_csi_unlikely (status))
  return status;

    pop (1);

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_rgba (g, g, g, 1);
    return push (&obj);
}

static csi_status_t
_gt (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *a, *b;
    int cmp;

    check (2);

    b = _csi_peek_ostack (ctx, 0);
    a = _csi_peek_ostack (ctx, 1);

    status = csi_object_compare (a, b, &cmp);
    if (_csi_unlikely (status))
  return status;

    pop (2);
    return _csi_push_ostack_boolean (ctx, cmp > 0);
}

static csi_status_t
_identity (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;

    status = csi_matrix_new (ctx, &obj);
    if (_csi_unlikely (status))
  return status;

    return push (&obj);
}

static csi_status_t
_if (csi_t *ctx)
{
    csi_array_t *proc;
    csi_boolean_t predicate = FALSE; /* silence the compiler */
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_procedure (ctx, 0, &proc);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_boolean (ctx, 1, &predicate);
    if (_csi_unlikely (status))
  return status;

    proc->base.ref++;
    pop (2);

    if (predicate)
  status = _csi_array_execute (ctx, proc);

    if (--proc->base.ref == 0)
  csi_array_free (ctx, proc);

    return status;
}

static csi_status_t
_ifelse (csi_t *ctx)
{
    csi_array_t *true_proc, *false_proc;
    csi_boolean_t predicate = FALSE; /* silence the compiler */
    csi_status_t status;

    check (3);

    status = _csi_ostack_get_procedure (ctx, 0, &false_proc);
    if (_csi_unlikely (status))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    status = _csi_ostack_get_procedure (ctx, 1, &true_proc);
    if (_csi_unlikely (status))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    status = _csi_ostack_get_boolean (ctx, 2, &predicate);
    if (_csi_unlikely (status))
  return status;

    true_proc->base.ref++;
    false_proc->base.ref++;
    pop (3);

    if (predicate)
  status = _csi_array_execute (ctx, true_proc);
    else
  status = _csi_array_execute (ctx, false_proc);

    if (--true_proc->base.ref == 0)
  csi_array_free (ctx, true_proc);
    if (--false_proc->base.ref == 0)
  csi_array_free (ctx, false_proc);

    return status;
}

static csi_status_t
_image_read_raw (csi_t *ctx,
     csi_object_t *src,
     cairo_format_t format,
     int width, int height,
     cairo_surface_t **image_out)
{
    cairo_surface_t *image;
    uint8_t *bp, *data;
    int rem, len, ret, x, rowlen, instride, stride;
    cairo_status_t status;

    if (width == 0 || height == 0) {
  *image_out = cairo_image_surface_create (format, 0, 0);
  return CSI_STATUS_SUCCESS;
    }

    if (ctx->hooks.create_source_image != NULL) {
  image = ctx->hooks.create_source_image (ctx->hooks.closure,
            format, width, height,
            0);

  stride = cairo_image_surface_get_stride (image);
  data = cairo_image_surface_get_data (image);
    } else {
  stride = cairo_format_stride_for_width (format, width);
  data = malloc (stride * height);
  if (data == NULL)
      return CAIRO_STATUS_NO_MEMORY;

  image = cairo_image_surface_create_for_data (data, format,
                 width, height, stride);
  status = cairo_surface_set_user_data (image,
                (const cairo_user_data_key_t *) image,
                data, free);
  if (status) {
      cairo_surface_destroy (image);
      free (image);
      return status;
  }
    }

    switch (format) {
    case CAIRO_FORMAT_A1:
  instride = rowlen = (width+7)/8;
  break;
    case CAIRO_FORMAT_A8:
  instride = rowlen = width;
  break;
    case CAIRO_FORMAT_RGB16_565:
  instride = rowlen = 2 * width;
  break;
    case CAIRO_FORMAT_RGB24:
  rowlen = 3 * width;
  instride = 4 *width;
  break;
    default:
    case CAIRO_FORMAT_RGB30:
    case CAIRO_FORMAT_INVALID:
    case CAIRO_FORMAT_ARGB32:
  instride = rowlen = 4 * width;
  break;
    case CAIRO_FORMAT_RGB96F:
  instride = rowlen = 12 * width;
  break;
    case CAIRO_FORMAT_RGBA128F:
  instride = rowlen = 16 * width;
  break;
    }
    len = rowlen * height;

    if (rowlen == instride &&
  src->type == CSI_OBJECT_TYPE_STRING &&
  len == src->datum.string->deflate)
    {
  csi_string_t *s = src->datum.string;

  switch (s->method) {
  default:
  case NONE:
err_decompress:
      cairo_surface_destroy (image);
      return _csi_error (CSI_STATUS_READ_ERROR);

  case ZLIB:
        {
#if HAVE_ZLIB
            uLongf out = s->deflate;
      if (uncompress ((Bytef *) data, &out,
          (Bytef *) s->string, s->len) != Z_OK)
#endif
    goto err_decompress;
      break;
        }

  case LZO:
        {
#if HAVE_LZO
            lzo_uint out = s->deflate;
      if (lzo2a_decompress ((Bytef *) s->string, s->len,
          (Bytef *) data, &out,
          NULL))
#endif
    goto err_decompress;
      break;
        }
  }
    }
    else
    {
  csi_object_t file;

  status = csi_object_as_file (ctx, src, &file);
  if (_csi_unlikely (status)) {
      cairo_surface_destroy (image);
      return status;
  }

  bp = data;
  rem = len;
  while (rem) {
      ret = csi_file_read (file.datum.file, bp, rem);
      if (_csi_unlikely (ret == 0)) {
    cairo_surface_destroy (image);
    return _csi_error (CSI_STATUS_READ_ERROR);
      }
      rem -= ret;
      bp += ret;
  }

  if (len != height * stride) {
      while (--height) {
    uint8_t *row = data + height * stride;

    /* XXX pixel conversion */
    switch (format) {
    case CAIRO_FORMAT_A1:
        for (x = rowlen; x--; ) {
      uint8_t byte = *--bp;
      row[x] = CSI_BITSWAP8_IF_LITTLE_ENDIAN (byte);
        }
        break;
    case CAIRO_FORMAT_A8:
        for (x = width; x--; )
      row[x] = *--bp;
        break;
    case CAIRO_FORMAT_RGB16_565:
        for (x = width; x--; ) {
#ifdef WORDS_BIGENDIAN
      row[2*x + 1] = *--bp;
      row[2*x + 0] = *--bp;
#else
      row[2*x + 0] = *--bp;
      row[2*x + 1] = *--bp;
#endif
        }
        break;
    case CAIRO_FORMAT_RGB24:
        for (x = width; x--; ) {
#ifdef WORDS_BIGENDIAN
      row[4*x + 3] = *--bp;
      row[4*x + 2] = *--bp;
      row[4*x + 1] = *--bp;
      row[4*x + 0] = 0xff;
#else
      row[4*x + 0] = *--bp;
      row[4*x + 1] = *--bp;
      row[4*x + 2] = *--bp;
      row[4*x + 3] = 0xff;
#endif
        }
        break;
    case CAIRO_FORMAT_RGB96F:
    case CAIRO_FORMAT_RGBA128F:
    case CAIRO_FORMAT_RGB30:
    case CAIRO_FORMAT_INVALID:
    case CAIRO_FORMAT_ARGB32:
        /* stride == width */
        break;
    }

    memset (row + instride, 0, stride - instride);
      }

      /* need to treat last row carefully */
      switch (format) {
      case CAIRO_FORMAT_A1:
    for (x = rowlen; x--; ) {
        uint8_t byte = *--bp;
        data[x] = CSI_BITSWAP8_IF_LITTLE_ENDIAN (byte);
    }
    break;
      case CAIRO_FORMAT_A8:
    for (x = width; x--; )
        data[x] = *--bp;
    break;
      case CAIRO_FORMAT_RGB16_565:
    for (x = width; x--; ) {
#ifdef WORDS_BIGENDIAN
        data[2*x + 1] = *--bp;
        data[2*x + 0] = *--bp;
#else
        data[2*x + 0] = *--bp;
        data[2*x + 1] = *--bp;
#endif
    }
    break;
      case CAIRO_FORMAT_RGB24:
    for (x = width; --x>1; ) {
#ifdef WORDS_BIGENDIAN
        data[4*x + 3] = *--bp;
        data[4*x + 2] = *--bp;
        data[4*x + 1] = *--bp;
        data[4*x + 0] = 0xff;
#else
        data[4*x + 0] = *--bp;
        data[4*x + 1] = *--bp;
        data[4*x + 2] = *--bp;
        data[4*x + 3] = 0xff;
#endif
    }
    if (width > 1) {
        uint8_t rgb[2][3];
        /* shuffle the last couple of overlapping pixels */
        rgb[1][0] = data[5];
        rgb[1][1] = data[4];
        rgb[1][2] = data[3];
        rgb[0][0] = data[2];
        rgb[0][1] = data[1];
        rgb[0][2] = data[0];
#ifdef WORDS_BIGENDIAN
        data[4] = 0xff;
        data[5] = rgb[1][2];
        data[6] = rgb[1][1];
        data[7] = rgb[1][0];
        data[0] = 0xff;
        data[1] = rgb[0][2];
        data[2] = rgb[0][1];
        data[3] = rgb[0][0];
#else
        data[7] = 0xff;
        data[6] = rgb[1][2];
        data[5] = rgb[1][1];
        data[4] = rgb[1][0];
        data[3] = 0xff;
        data[2] = rgb[0][2];
        data[1] = rgb[0][1];
        data[0] = rgb[0][0];
#endif
    } else {
#ifdef WORDS_BIGENDIAN
        data[0] = 0xff;
        data[1] = data[0];
        data[2] = data[1];
        data[3] = data[2];
#else
        data[3] = data[0];
        data[0] = data[2];
        data[2] = data[3];
        data[3] = 0xff;
#endif
    }
    break;
      case CAIRO_FORMAT_RGBA128F:
      case CAIRO_FORMAT_RGB96F:
      case CAIRO_FORMAT_RGB30:
      case CAIRO_FORMAT_INVALID:
      case CAIRO_FORMAT_ARGB32:
    /* stride == width */
    break;
      }
      memset (data + instride, 0, stride - instride);
  } else {
#ifndef WORDS_BIGENDIAN
      switch (format) {
      case CAIRO_FORMAT_A1:
    for (x = 0; x < len; x++) {
        uint8_t byte = data[x];
        data[x] = CSI_BITSWAP8_IF_LITTLE_ENDIAN (byte);
    }
    break;
      case CAIRO_FORMAT_RGB16_565:
    {
        uint32_t *rgba = (uint32_t *) data;
        for (x = len/2; x--; rgba++) {
      *rgba = bswap_16 (*rgba);
        }
    }
    break;
      case CAIRO_FORMAT_ARGB32:
    {
        uint32_t *rgba = (uint32_t *) data;
        for (x = len/4; x--; rgba++) {
      *rgba = bswap_32 (*rgba);
        }
    }
    break;

      case CAIRO_FORMAT_A8:
    break;

      case CAIRO_FORMAT_RGBA128F:
      case CAIRO_FORMAT_RGB96F:
      case CAIRO_FORMAT_RGB30:
      case CAIRO_FORMAT_RGB24:
      case CAIRO_FORMAT_INVALID:
      default:
    break;
      }
#endif
  }
  csi_object_free (ctx, &file);
    }

    cairo_surface_mark_dirty (image);
    *image_out = image;
    return CSI_STATUS_SUCCESS;
}

static cairo_status_t
png_read_func (void *closure, uint8_t *data, unsigned int len)
{
    int ret;

    ret = csi_file_read (closure, data, len);
    if ((unsigned int) ret != len)
  return CAIRO_STATUS_READ_ERROR;

    return CAIRO_STATUS_SUCCESS;
}

static csi_status_t
_image_read_png (csi_file_t *src, cairo_surface_t **out)
{
#if CAIRO_HAS_PNG_FUNCTIONS
    *out = cairo_image_surface_create_from_png_stream (png_read_func, src);
    return cairo_surface_status (*out);
#else
    return CAIRO_STATUS_READ_ERROR;
#endif
}

struct _image_tag {
    csi_t *ctx;
    csi_blob_t blob;
    cairo_surface_t *surface;
};

static void
_image_tag_done (void *closure)
{
    struct _image_tag *tag = closure;
    csi_t *ctx = tag->ctx;

    ctx->_images = _csi_list_unlink (ctx->_images, &tag->blob.list);
    _csi_slab_free (ctx, tag, sizeof (*tag));
    cairo_script_interpreter_destroy (ctx);
}

static void
_image_hash (csi_blob_t *blob,
       cairo_surface_t *surface)
{
    uint32_t  value;

    value = cairo_image_surface_get_width (surface);
    _csi_blob_hash (blob, &value, 1);

    value = cairo_image_surface_get_height (surface);
    _csi_blob_hash (blob, &value, 1);

    value = cairo_image_surface_get_format (surface);
    _csi_blob_hash (blob, &value, 1);
}

static cairo_surface_t *
_image_cached (csi_t *ctx, cairo_surface_t *surface)
{
    csi_blob_t tmpl;
    csi_list_t *link;
    uint8_t *data;
    int stride, height;
    struct _image_tag *tag;

    /* check for an existing image  */

    data = cairo_image_surface_get_data (surface);
    stride = cairo_image_surface_get_stride (surface);
    height = cairo_image_surface_get_height (surface);
    _csi_blob_init (&tmpl, data, stride * height);
    _image_hash (&tmpl, surface);
    link = _csi_list_find (ctx->_images, _csi_blob_equal, &tmpl);
    if (link) {
  cairo_surface_destroy (surface);
  tag = csi_container_of (link, struct _image_tag, blob.list);
  return cairo_surface_reference (tag->surface);
    }

    /* none found, insert a tag for this one */

    tag = _csi_slab_alloc (ctx, sizeof (struct _image_tag));
    if (tag == NULL)
  return surface;

    ctx->_images = _csi_list_prepend (ctx->_images, &tag->blob.list);
    tag->ctx = cairo_script_interpreter_reference (ctx);
    tag->blob.hash = tmpl.hash;
    tag->blob.bytes = tmpl.bytes;
    tag->blob.len = tmpl.len;
    tag->surface = surface;

    if (cairo_surface_set_user_data (surface, &_csi_blob_key,
             tag, _image_tag_done))
    {
  _image_tag_done (tag);
    }

    return surface;
}

static csi_status_t
_image_load_from_dictionary (csi_t *ctx,
           csi_dictionary_t *dict,
           cairo_surface_t **image_out)
{
    csi_object_t obj, key;
    long width;
    long height;
    long format;
    cairo_surface_t *image = NULL; /* silence the compiler */
    csi_status_t status;

    /* check for "status? */

    status = _csi_dictionary_get_integer (ctx, dict, "width", FALSE, &width);
    if (_csi_unlikely (status))
  return status;
    status = _csi_dictionary_get_integer (ctx, dict, "height", FALSE, &height);
    if (_csi_unlikely (status))
  return status;

    format = CAIRO_FORMAT_ARGB32;
    status = _csi_dictionary_get_integer (ctx, dict, "format", TRUE, &format);
    if (_csi_unlikely (status))
  return status;

    status = csi_name_new_static (ctx, &key, "source");
    if (_csi_unlikely (status))
  return status;

    if (csi_dictionary_has (dict, key.datum.name)) {
  enum mime_type mime_type;
  csi_object_t file;

  status = csi_dictionary_get (ctx, dict, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return status;

  status = csi_name_new_static (ctx, &key, "mime-type");
  if (_csi_unlikely (status))
      return status;

  mime_type = MIME_TYPE_NONE;
  if (csi_dictionary_has (dict, key.datum.name)) {
      csi_object_t type_obj;
      const char *type_str;
      int type;

      status = csi_dictionary_get (ctx, dict, key.datum.name, &type_obj);
      if (_csi_unlikely (status))
    return status;

      type = csi_object_get_type (&type_obj);
      switch (type) {
      case CSI_OBJECT_TYPE_STRING:
    type_str = type_obj.datum.string->string;
    break;
      case CSI_OBJECT_TYPE_NAME:
    type_str = (char *) type_obj.datum.name;
    break;
      default:
    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
      }

      if (strcmp (type_str, CAIRO_MIME_TYPE_PNG) == 0)
    mime_type = MIME_TYPE_PNG;
  }


  /* XXX hook for general mime-type decoder */

  switch (mime_type) {
  case MIME_TYPE_NONE:
      status = _image_read_raw (ctx, &obj, format, width, height, &image);
      break;
  case MIME_TYPE_PNG:
      status = csi_object_as_file (ctx, &obj, &file);
      if (_csi_unlikely (status))
    return status;

      status = _image_read_png (file.datum.file, &image);
      csi_object_free (ctx, &file);
      break;
  }
  if (_csi_unlikely (status))
      return status;

  image = _image_cached (ctx, image);
    } else
  image = cairo_image_surface_create (format, width, height);

    *image_out = image;
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_image (csi_t *ctx)
{
    csi_dictionary_t *dict;
    cairo_surface_t *image;
    csi_status_t status;
    csi_object_t obj;

    check (1);

    status = _csi_ostack_get_dictionary (ctx, 0, &dict);
    if (_csi_unlikely (status))
  return status;

    status = _image_load_from_dictionary (ctx, dict, &image);
    if (_csi_unlikely (status))
  return status;

    pop (1);
    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = image;
    return push (&obj);
}

static csi_status_t
_index (csi_t *ctx)
{
    csi_status_t status;
    long n;

    check (1);

    status = _csi_ostack_get_integer (ctx, 0,  &n);
    if (_csi_unlikely (status))
  return status;

    pop (1);

    check (n);
    return _csi_push_ostack_copy (ctx, _csi_peek_ostack (ctx, n));
}

static csi_status_t
_integer (csi_t *ctx)
{
    csi_object_t *obj;
    int type;

    check (1);

    obj = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_INTEGER:
  break;
    case CSI_OBJECT_TYPE_REAL:
  obj->datum.integer = obj->datum.real;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    obj->type = CSI_OBJECT_TYPE_INTEGER;

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_invert (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    cairo_matrix_t m;

    check (1);

    status = _csi_ostack_get_matrix (ctx, 0, &m);
    if (_csi_unlikely (status))
  return status;

    cairo_matrix_invert (&m);

    status = csi_matrix_new_from_matrix (ctx, &obj, &m);
    if (_csi_unlikely (status))
  return status;

    pop (1);

    return push (&obj);
}

static csi_status_t
_le (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *a, *b;
    int cmp;

    check (2);

    b = _csi_peek_ostack (ctx, 0);
    a = _csi_peek_ostack (ctx, 1);

    status = csi_object_compare (a, b, &cmp);
    if (_csi_unlikely (status))
  return status;

    pop (2);
    return _csi_push_ostack_boolean (ctx, cmp <= 0);
}

static csi_status_t
_linear (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    double x1, y1, x2, y2;

    check (4);

    status = _csi_ostack_get_number (ctx, 0, &y2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &y1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &x1);
    if (_csi_unlikely (status))
  return status;

    pop (4);

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_linear (x1, y1, x2, y2);
    return push (&obj);
}

static csi_status_t
_line_to (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *obj;
    int type;
    double x, y;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;

    /* XXX path object */

    obj = _csi_peek_ostack (ctx, 2);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_line_to (obj->datum.cr, x, y);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  cairo_mesh_pattern_line_to (obj->datum.pattern, x, y);
  break;
    }

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_lt (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *a, *b;
    int cmp;

    check (2);

    b = _csi_peek_ostack (ctx, 0);
    a = _csi_peek_ostack (ctx, 1);

    status = csi_object_compare (a, b, &cmp);
    if (_csi_unlikely (status))
  return status;

    pop (2);
    return _csi_push_ostack_boolean (ctx, cmp < 0);
}

static csi_status_t
_mark (csi_t *ctx)
{
    return _csi_push_ostack_mark (ctx);
}

static csi_status_t
_ne (csi_t *ctx)
{
    csi_object_t *a, *b;
    csi_boolean_t v;

    check (2);

    b = _csi_peek_ostack (ctx, 0);
    a = _csi_peek_ostack (ctx, 1);

    v = ! csi_object_eq (a, b);

    pop (2);
    return _csi_push_ostack_boolean (ctx, v);
}

static csi_status_t
_neg (csi_t *ctx)
{
    csi_object_t *obj;
    int type;

    check (1);

    obj = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_INTEGER:
  obj->datum.integer = -obj->datum.integer;
  break;
    case CSI_OBJECT_TYPE_REAL:
  obj->datum.real = -obj->datum.real;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_not (csi_t *ctx)
{
    csi_object_t *obj;
    int type;

    check (1);

    obj = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_BOOLEAN:
  obj->datum.boolean = ! obj->datum.boolean;
  break;
    case CSI_OBJECT_TYPE_INTEGER:
  obj->type = CSI_OBJECT_TYPE_BOOLEAN;
  obj->datum.boolean = ! obj->datum.integer;
  break;
    case CSI_OBJECT_TYPE_REAL:
  obj->type = CSI_OBJECT_TYPE_BOOLEAN;
  obj->datum.boolean = obj->datum.real == 0.0;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_new_path (csi_t *ctx)
{
    /* XXX handle path object */
    return _do_cairo_op (ctx, cairo_new_path);
}

static csi_status_t
_new_sub_path (csi_t *ctx)
{
    /* XXX handle path object */
    return _do_cairo_op (ctx, cairo_new_sub_path);
}

static csi_status_t
_null (csi_t *ctx)
{
    return _csi_push_ostack_null (ctx);
}

static csi_status_t
_mask (csi_t *ctx)
{
    cairo_t *cr;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_pattern (ctx, 0, &pattern);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_mask (cr, pattern);
    pop (1);

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_matrix (csi_t *ctx)
{
    csi_object_t *obj, matrix;
    double v[6];
    csi_status_t status;
    int n;

    check (1);

    obj = _csi_peek_ostack (ctx, 0);
    if (csi_object_is_number (obj)) {
  check (6);

  for (n = 6; n--; ) {
      status = _csi_ostack_get_number (ctx, 5-n, &v[n]);
      if (_csi_unlikely (status))
    return status;
  }
  status = csi_matrix_new_from_values (ctx, &matrix, v);
  if (_csi_unlikely (status))
      return status;

  pop (6);
    } else {
  csi_array_t *array;

  status = _csi_ostack_get_array (ctx, 0, &array);
  if (_csi_unlikely (status))
      return status;

  status = csi_matrix_new_from_array (ctx, &matrix, array);
  if (_csi_unlikely (status))
      return status;

  pop (1);
    }

    return push (&matrix);
}

static csi_status_t
_map_to_image (csi_t *ctx)
{
    csi_object_t obj;
    csi_array_t *array;
    csi_status_t status;
    cairo_rectangle_int_t extents, *r;
    cairo_surface_t *surface;

    check (2);

    status = _csi_ostack_get_array (ctx, 0, &array);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_surface (ctx, 1, &surface);
    if (_csi_unlikely (status))
  return status;

    switch (array->stack.len) {
    case 0:
  r = NULL;
  break;
    case 4:
  extents.x = floor (_csi_object_as_real (&array->stack.objects[0]));
  extents.y = floor (_csi_object_as_real (&array->stack.objects[1]));
  extents.width = ceil (_csi_object_as_real (&array->stack.objects[2]));
  extents.height = ceil (_csi_object_as_real (&array->stack.objects[3]));
  r = &extents;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = cairo_surface_reference (cairo_surface_map_to_image (surface, r));
    pop (1);
    return push (&obj);
}

static csi_status_t
_unmap_image (csi_t *ctx)
{
    cairo_surface_t *surface, *image;
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_surface (ctx, 0, &image);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 1, &surface);
    if (_csi_unlikely (status))
  return status;

    cairo_surface_unmap_image (surface, image);

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_mesh (csi_t *ctx)
{
    csi_object_t obj;

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_mesh ();
    return push (&obj);
}

static csi_status_t
_mesh_begin_patch (csi_t *ctx)
{
    csi_status_t status;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */

    check (1);

    status = _csi_ostack_get_pattern (ctx, 0, &pattern);
    if (_csi_unlikely (status))
  return status;

    cairo_mesh_pattern_begin_patch (pattern);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_mesh_end_patch (csi_t *ctx)
{
    csi_status_t status;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */

    check (1);

    status = _csi_ostack_get_pattern (ctx, 0, &pattern);
    if (_csi_unlikely (status))
  return status;

    cairo_mesh_pattern_end_patch (pattern);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_mesh_set_control_point (csi_t *ctx)
{
    csi_status_t status;
    double x, y;
    csi_integer_t point;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */

    check (4);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 2, &point);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_pattern (ctx, 3, &pattern);
    if (_csi_unlikely (status))
  return status;

    cairo_mesh_pattern_set_control_point (pattern, point, x, y);

    pop (3);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_mesh_set_corner_color (csi_t *ctx)
{
    csi_status_t status;
    double r, g, b, a;
    csi_integer_t corner;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */

    check (6);

    status = _csi_ostack_get_number (ctx, 0, &a);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &b);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &g);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &r);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 4, &corner);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_pattern (ctx, 5, &pattern);
    if (_csi_unlikely (status))
  return status;

    cairo_mesh_pattern_set_corner_color_rgba (pattern, corner, r, g, b, a);

    pop (5);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_mod (csi_t *ctx)
{
    csi_integer_t x, y;
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;

    pop (2);
    return _csi_push_ostack_integer (ctx, x % y);
}

static csi_status_t
_move_to (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *obj;
    int type;
    double x, y;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 2);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_move_to (obj->datum.cr, x, y);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  cairo_mesh_pattern_move_to (obj->datum.pattern, x, y);
  break;

  /* XXX path object */
    }

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_mul (csi_t *ctx)
{
    csi_object_t *A;
    csi_object_t *B;
    csi_object_type_t type_a, type_b;

    check (2);

    B = _csi_peek_ostack (ctx, 0);
    A = _csi_peek_ostack (ctx, 1);

    type_a = csi_object_get_type (A);
    if (_csi_unlikely (! (type_a == CSI_OBJECT_TYPE_INTEGER ||
          type_a == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
    type_b = csi_object_get_type (B);
    if (_csi_unlikely (! (type_b == CSI_OBJECT_TYPE_INTEGER ||
          type_b == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);

    if (type_a == CSI_OBJECT_TYPE_REAL &&
  type_b == CSI_OBJECT_TYPE_REAL)
    {
  return _csi_push_ostack_real (ctx, A->datum.real * B->datum.real);

    }
    else if (type_a == CSI_OBJECT_TYPE_INTEGER &&
       type_b == CSI_OBJECT_TYPE_INTEGER)
    {
  return _csi_push_ostack_integer (ctx,
           A->datum.integer * B->datum.integer);
    }
    else
    {
  double v;

  if (type_a == CSI_OBJECT_TYPE_REAL)
      v = A->datum.real;
  else
      v = A->datum.integer;

  if (type_b == CSI_OBJECT_TYPE_REAL)
      v *= B->datum.real;
  else
      v *= B->datum.integer;

  return _csi_push_ostack_real (ctx, v);
    }
}

static csi_status_t
_or (csi_t *ctx)
{
    csi_object_t *a, *b;
    int type;

    check (2);

    a = _csi_peek_ostack (ctx, 0);
    b = _csi_peek_ostack (ctx, 1);
    if (_csi_unlikely (csi_object_get_type (a) != csi_object_get_type (b)))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    pop (2);
    type = csi_object_get_type (a);
    switch (type) {
    case CSI_OBJECT_TYPE_INTEGER:
  return _csi_push_ostack_integer (ctx,
           a->datum.integer | b->datum.integer);
    case CSI_OBJECT_TYPE_BOOLEAN:
  return _csi_push_ostack_boolean (ctx,
           a->datum.boolean | b->datum.boolean);
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
}

static csi_status_t
_paint (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_paint);
}

static csi_status_t
_paint_with_alpha (csi_t *ctx)
{
    cairo_t *cr;
    csi_status_t status;
    double alpha;

    check (2);

    status = _csi_ostack_get_number (ctx, 0, &alpha);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_paint_with_alpha (cr, alpha);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_pattern (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    cairo_surface_t *surface;

    check (1);

    status = _csi_ostack_get_surface (ctx, 0, &surface);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_for_surface (surface);

    pop (1);
    return push (&obj);
}

static csi_status_t
_pop (csi_t *ctx)
{
    check (1);
    pop (1);

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_pop_group (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    cairo_t *cr;

    check (1);

    status = _csi_ostack_get_context (ctx, 0, &cr);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pop_group (cr);

    return push (&obj);
}

static csi_status_t
_push_group (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    long content;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &content);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_push_group_with_content (cr, content);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_radial (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    double x1, y1, r1, x2, y2, r2;

    check (6);

    status = _csi_ostack_get_number (ctx, 0, &r2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &y2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &x2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &r1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 4, &y1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 5, &x1);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_radial (x1, y1, r1, x2, y2, r2);
    pop (6);
    return push (&obj);
}

static csi_status_t
_rectangle (csi_t *ctx)
{
    csi_status_t status;
    double x, y;
    double w, h;
    cairo_t *cr;

    check (5);

    status = _csi_ostack_get_number (ctx, 0, &h);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &w);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 4, &cr);
    if (_csi_unlikely (status))
  return status;

    /* XXX path object */

    cairo_rectangle (cr, x, y, w, h);
    pop(4);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_rel_curve_to (csi_t *ctx)
{
    csi_status_t status;
    double x1, y1;
    double x2, y2;
    double x3, y3;
    cairo_t *cr;

    check (7);

    status = _csi_ostack_get_number (ctx, 0, &y3);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x3);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &y2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &x2);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 4, &y1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 5, &x1);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 6, &cr);
    if (_csi_unlikely (status))
  return status;

    /* XXX path object */

    cairo_rel_curve_to (cr, x1, y1, x2, y2, x3, y3);
    pop (6);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_rel_line_to (csi_t *ctx)
{
    csi_status_t status;
    double x, y;
    cairo_t *cr;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 2, &cr);
    if (_csi_unlikely (status))
  return status;

    /* XXX path object */

    cairo_rel_line_to (cr, x, y);
    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_rel_move_to (csi_t *ctx)
{
    csi_status_t status;
    double x, y;
    cairo_t *cr;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 2, &cr);
    if (_csi_unlikely (status))
  return status;

    /* XXX path object */
    cairo_rel_move_to (cr, x, y);
    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_repeat (csi_t *ctx)
{
    csi_array_t *proc;
    csi_integer_t count;
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_procedure (ctx, 0, &proc);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_integer (ctx, 1, &count);
    if (_csi_unlikely (status))
  return status;

    if (_csi_unlikely (count < 0))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    proc->base.ref++;
    pop (2);

    while (count--) {
  status = _csi_array_execute (ctx, proc);
  if (_csi_unlikely (status))
      break;
    }

    if (--proc->base.ref == 0)
  csi_array_free (ctx, proc);

    return status;
}

static csi_status_t
_reset_clip (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_reset_clip);
}

static csi_status_t
_restore (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_restore);
}

static csi_status_t
_rgb (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    double r,g,b;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &b);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &g);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &r);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_rgb (r, g, b);
    pop (3);
    return push (&obj);
}

static csi_status_t
_rgba (csi_t *ctx)
{
    csi_object_t obj;
    csi_status_t status;
    double r,g,b,a;

    check (4);

    status = _csi_ostack_get_number (ctx, 0, &a);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &b);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &g);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &r);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_PATTERN;
    obj.datum.pattern = cairo_pattern_create_rgba (r, g, b, a);
    pop (4);
    return push (&obj);
}

static csi_status_t
_roll (csi_t *ctx)
{
    csi_status_t status;
    long j, n;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &j);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 1, &n);
    if (_csi_unlikely (status))
  return status;

    pop (2);
    check (n);
    return _csi_stack_roll (ctx, &ctx->ostack, j, n);
}

static csi_status_t
_rotate (csi_t *ctx)
{
    csi_object_t *obj;
    csi_status_t status;
    double theta;
    int type;

    check (2);

    status = _csi_ostack_get_number (ctx, 0, &theta);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_rotate (obj->datum.cr, theta);
  break;

    case CSI_OBJECT_TYPE_PATTERN:
  {
      cairo_matrix_t ctm;
      cairo_pattern_get_matrix (obj->datum.pattern, &ctm);
      cairo_matrix_rotate (&ctm, theta);
      cairo_pattern_set_matrix (obj->datum.pattern, &ctm);
  }
  break;


    case CSI_OBJECT_TYPE_MATRIX:
  cairo_matrix_rotate (&obj->datum.matrix->matrix, theta);
  break;

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_save (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_save);
}

static csi_status_t
_scale (csi_t *ctx)
{
    csi_object_t *obj;
    csi_status_t status;
    double x, y;
    int type;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 2);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_scale (obj->datum.cr, x, y);
  break;

    case CSI_OBJECT_TYPE_PATTERN:
  {
      cairo_matrix_t ctm;
      cairo_pattern_get_matrix (obj->datum.pattern, &ctm);
      cairo_matrix_scale (&ctm, x, y);
      cairo_pattern_set_matrix (obj->datum.pattern, &ctm);
  }
  break;


    case CSI_OBJECT_TYPE_MATRIX:
  cairo_matrix_scale (&obj->datum.matrix->matrix, x, y);
  break;

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_font_options_load_from_dictionary (csi_t *ctx,
            csi_dictionary_t *dict,
            cairo_font_options_t *options)
{
    const struct {
  const char *key;
  void (*setter) (cairo_font_options_t *, int val);
    } properties[] = {
  { "antialias",
      (void (*)(cairo_font_options_t *, int val))
    cairo_font_options_set_antialias },
  { "subpixel-order",
      (void (*)(cairo_font_options_t *, int val))
    cairo_font_options_set_subpixel_order },
  { "hint-style",
      (void (*)(cairo_font_options_t *, int val))
    cairo_font_options_set_hint_style },
  { "hint-metrics",
      (void (*)(cairo_font_options_t *, int val))
    cairo_font_options_set_hint_metrics },
  { NULL, NULL },
    }, *prop = properties;

    while (prop->key != NULL) {
  csi_object_t key, value;
  csi_status_t status;

  status = csi_name_new_static (ctx, &key, prop->key);
  if (_csi_unlikely (status))
      return status;

  if (csi_dictionary_has (dict, key.datum.name)) {
      status = csi_dictionary_get (ctx, dict, key.datum.name, &value);
      if (_csi_unlikely (status))
    return status;

      if (_csi_unlikely (csi_object_get_type (&value) !=
         CSI_OBJECT_TYPE_INTEGER))
      {
    csi_object_free (ctx, &value);
    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
      }

      prop->setter (options, value.datum.integer);
  }

  prop++;
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_scaled_font (csi_t *ctx)
{
    csi_object_t obj;
    csi_dictionary_t *dict;
    cairo_font_face_t *font_face = NULL; /* silence the compiler */
    cairo_matrix_t font_matrix, ctm;
    cairo_font_options_t *options;
    csi_status_t status;

    check (4);

    status = _csi_ostack_get_dictionary (ctx, 0, &dict);
    if (_csi_unlikely (status))
  return status;
    options = cairo_font_options_create ();
    status = _font_options_load_from_dictionary (ctx, dict, options);
    if (_csi_unlikely (status)) {
  cairo_font_options_destroy (options);
  return status;
    }

    status = _csi_ostack_get_matrix (ctx, 1, &ctm);
    if (_csi_unlikely (status)) {
  cairo_font_options_destroy (options);
  return status;
    }

    status = _csi_ostack_get_matrix (ctx, 2, &font_matrix);
    if (_csi_unlikely (status)) {
  cairo_font_options_destroy (options);
  return status;
    }

    status = _csi_ostack_get_font_face (ctx, 3, &font_face);
    if (_csi_unlikely (status)) {
  cairo_font_options_destroy (options);
  return status;
    }

    obj.type = CSI_OBJECT_TYPE_SCALED_FONT;
    obj.datum.scaled_font = cairo_scaled_font_create (font_face,
                  &font_matrix,
                  &ctm,
                  options);
    cairo_font_options_destroy (options);
    pop (4);
    return push (&obj);
}

static csi_status_t
_select_font_face (csi_t *ctx)
{
    cairo_t *cr;
    long weight;
    long slant;
    csi_string_t *family;
    csi_status_t status;

    check (4);

    status = _csi_ostack_get_integer (ctx, 0,  &weight);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 1, &slant);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_string (ctx, 2, &family);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 3, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_select_font_face (cr, family->string, slant, weight);
    pop (3);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_context_set (csi_t *ctx,
        cairo_t *cr,
        csi_name_t key,
        csi_object_t *obj)
{
    if (strcmp ((char *) key, "source") == 0) {
  if (_csi_unlikely (csi_object_get_type (obj) !=
           CSI_OBJECT_TYPE_PATTERN))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  cairo_set_source (cr, obj->datum.pattern);
  return CSI_STATUS_SUCCESS;
    }

    if (strcmp ((char *) key, "scaled-font") == 0) {
  if (_csi_unlikely (csi_object_get_type (obj) !=
           CSI_OBJECT_TYPE_SCALED_FONT))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  cairo_set_scaled_font (cr, obj->datum.scaled_font);
  return CSI_STATUS_SUCCESS;
    }

    if (strcmp ((char *) key, "font-face") == 0) {
  if (_csi_unlikely (csi_object_get_type (obj) !=
           CSI_OBJECT_TYPE_FONT))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  cairo_set_font_face (cr, obj->datum.font_face);
  return CSI_STATUS_SUCCESS;
    }

    /* return _proxy_set()? */
    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
}

static csi_status_t
_set (csi_t *ctx)
{
    csi_object_t *key, *value, *dst;
    csi_status_t status;
    int type;

    check (3);

    value = _csi_peek_ostack (ctx, 0);
    key = _csi_peek_ostack (ctx, 1);
    dst = _csi_peek_ostack (ctx, 2);

    type = csi_object_get_type (dst);
    switch (type) {
    case CSI_OBJECT_TYPE_DICTIONARY:
  if (_csi_unlikely (csi_object_get_type (key) !=
           CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  status = csi_dictionary_put (ctx,
             dst->datum.dictionary,
             key->datum.name,
             value);
  break;
    case CSI_OBJECT_TYPE_ARRAY:
  if (_csi_unlikely (csi_object_get_type (key) !=
           CSI_OBJECT_TYPE_INTEGER))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  status = csi_array_put (ctx,
        dst->datum.array,
        key->datum.integer,
        value);
  break;

    case CSI_OBJECT_TYPE_CONTEXT:
  if (_csi_unlikely (csi_object_get_type (key) !=
           CSI_OBJECT_TYPE_NAME))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  status = _context_set (ctx,
             dst->datum.cr,
             key->datum.name,
             value);
  break;

    case CSI_OBJECT_TYPE_STRING:
#if 0
  status = csi_string_put (dst, key, value);
  break;
#endif
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);
    return status;
}

static csi_status_t
_set_antialias (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    long antialias;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &antialias);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_antialias (cr, antialias);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_dash (csi_t *ctx)
{
    csi_array_t *array;
    csi_status_t status;
    cairo_t *cr;
    double offset;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &offset);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_array (ctx, 1, &array);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 2, &cr);
    if (_csi_unlikely (status))
  return status;

    if (array->stack.len == 0) {
  cairo_set_dash (cr, NULL, 0., 0.);
    } else {
  double stack_dashes[8];
  double *dashes;
  csi_integer_t n;

  if (_csi_likely (array->stack.len < ARRAY_LENGTH (stack_dashes))) {
      dashes = stack_dashes;
  } else {
      if (_csi_unlikely ((unsigned) array->stack.len >= INT_MAX / sizeof (double)))
    return _csi_error (CSI_STATUS_NO_MEMORY);
      dashes = _csi_alloc (ctx, sizeof (double) * array->stack.len);
      if (_csi_unlikely (dashes == NULL))
    return _csi_error (CSI_STATUS_NO_MEMORY);
  }

  for (n = 0; n < array->stack.len; n++) {
      if (_csi_unlikely (! csi_object_is_number
         (&array->stack.objects[n])))
      {
    if (dashes != stack_dashes)
        _csi_free (ctx, dashes);
    return _csi_error (CSI_STATUS_INVALID_SCRIPT);
      }

      dashes[n] = csi_number_get_value (&array->stack.objects[n]);
  }

  cairo_set_dash (cr, dashes, n, offset);

  if (dashes != stack_dashes)
      _csi_free (ctx, dashes);
    }

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_device_offset (csi_t *ctx)
{
    csi_status_t status;
    cairo_surface_t *surface;
    double x, y;

    check (3);

    status = _csi_ostack_get_number (ctx, 0,  &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 2, &surface);
    if (_csi_unlikely (status))
  return status;

    cairo_surface_set_device_offset (surface, x, y);
    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_device_scale (csi_t *ctx)
{
    csi_status_t status;
    cairo_surface_t *surface;
    double x, y;

    check (3);

    status = _csi_ostack_get_number (ctx, 0,  &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 2, &surface);
    if (_csi_unlikely (status))
  return status;

    cairo_surface_set_device_scale (surface, x, y);
    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_extend (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *obj;
    long extend;
    int type;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &extend);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_pattern_set_extend (cairo_get_source (obj->datum.cr),
          extend);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  cairo_pattern_set_extend (obj->datum.pattern, extend);
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_fallback_resolution (csi_t *ctx)
{
    csi_status_t status;
    cairo_surface_t *surface;
    double dpi_x, dpi_y;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &dpi_y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &dpi_x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 2, &surface);
    if (_csi_unlikely (status))
  return status;

    cairo_surface_set_fallback_resolution (surface, dpi_x, dpi_y);
    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_fill_rule (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    long fill_rule;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &fill_rule);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_fill_rule (cr, fill_rule);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_filter (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *obj;
    long filter;
    int type;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &filter);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_pattern_set_filter (cairo_get_source (obj->datum.cr),
          filter);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  cairo_pattern_set_filter (obj->datum.pattern, filter);
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_font_face (csi_t *ctx)
{
    cairo_t *cr;
    cairo_font_face_t *font = NULL; /* silence the compiler */
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_font_face (ctx, 0, &font);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_font_face (cr, font);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_font_options (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    csi_dictionary_t *dict;
    cairo_font_options_t *options;

    check (2);

    status = _csi_ostack_get_dictionary (ctx, 0, &dict);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    options = cairo_font_options_create ();
    status = _font_options_load_from_dictionary (ctx, dict, options);
    if (_csi_unlikely (status))
  return status;

    cairo_set_font_options (cr, options);
    cairo_font_options_destroy (options);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_font_matrix (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    cairo_matrix_t m;

    check (2);

    status = _csi_ostack_get_matrix (ctx, 0, &m);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_font_matrix (cr, &m);
    pop(1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_font_size (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    double size;

    check (2);

    status = _csi_ostack_get_number (ctx, 0, &size);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_font_size (cr, size);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_line_cap (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    long line_cap;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &line_cap);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_line_cap (cr, line_cap);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_line_join (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    long line_join;

    status = _csi_ostack_get_integer (ctx, 0, &line_join);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_line_join (cr, line_join);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_line_width (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    double line_width;

    check (2);

    status = _csi_ostack_get_number (ctx, 0, &line_width);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_line_width (cr, line_width);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_hairline (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    cairo_bool_t set_hairline = FALSE; /* silence the compiler */

    check (2);

    status = _csi_ostack_get_boolean (ctx, 0, &set_hairline);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
  if (_csi_unlikely (status))
  return status;

    cairo_set_hairline (cr, set_hairline);
  pop (1);
  return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_matrix (csi_t *ctx)
{
    csi_object_t *obj;
    csi_status_t status;
    cairo_matrix_t m;
    int type;

    check (2);

    status = _csi_ostack_get_matrix (ctx, 0, &m);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_set_matrix (obj->datum.cr, &m);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  cairo_pattern_set_matrix (obj->datum.pattern, &m);
  break;
    case CSI_OBJECT_TYPE_MATRIX:
  obj->datum.matrix->matrix = m;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

struct _mime_tag {
    csi_t *ctx;
    csi_string_t *source;
};
static void
_mime_tag_destroy (void *closure)
{
    struct _mime_tag *tag = closure;

    if (--tag->source->base.ref)
  csi_string_free (tag->ctx, tag->source);

    _csi_slab_free (tag->ctx, tag, sizeof (struct _mime_tag));
}

static csi_status_t
_set_mime_data (csi_t *ctx)
{
    csi_status_t status;
    csi_object_t *obj;
    const char *mime = NULL; /* silence the compiler */
    csi_object_t source;
    cairo_surface_t *surface;
    struct _mime_tag *tag;
    int type;

    check (3);

    obj = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_FILE:
  status = _csi_file_as_string (ctx, obj->datum.file, &source);
  if (_csi_unlikely (status))
      return status;

  break;

    case CSI_OBJECT_TYPE_STRING:
  source = *csi_object_reference (obj);
  break;

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    status = _csi_ostack_get_string_constant (ctx, 1, &mime);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_surface (ctx, 2, &surface);
    if (_csi_unlikely (status))
  return status;


    /* XXX free source */
    tag = _csi_slab_alloc (ctx, sizeof (struct _mime_tag));
    if (_csi_unlikely (tag == NULL))
  return _csi_error (CSI_STATUS_NO_MEMORY);
    tag->ctx = cairo_script_interpreter_reference (ctx);
    tag->source = source.datum.string;
    tag->source->base.ref++;

    status = cairo_surface_set_mime_data (surface,
            mime,
            (uint8_t *)
            source.datum.string->string,
            source.datum.string->len,
            _mime_tag_destroy, tag);
    if (_csi_unlikely (status)) {
  _mime_tag_destroy (tag);
  return status;
    }

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_miter_limit (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    double miter_limit;

    check (2);

    status = _csi_ostack_get_number (ctx, 0, &miter_limit);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_miter_limit (cr, miter_limit);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_operator (csi_t *ctx)
{
    cairo_t *cr;
    long val;
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_integer (ctx, 0, &val);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_operator (cr, val);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_scaled_font (csi_t *ctx)
{
    cairo_t *cr;
    cairo_scaled_font_t *font = NULL; /* silence the compiler */
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_scaled_font (ctx, 0, &font);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_scaled_font (cr, font);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_source (csi_t *ctx)
{
    cairo_t *cr;
    cairo_pattern_t *pattern = NULL; /* silence the compiler */
    csi_status_t status;

    check (2);

    status = _csi_ostack_get_pattern (ctx, 0, &pattern);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_source (cr, pattern);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_boolean_t
_matching_images (cairo_surface_t *a, cairo_surface_t *b)
{
    cairo_format_t format_a, format_b;

    if (cairo_surface_get_type (a) != CAIRO_SURFACE_TYPE_IMAGE)
  return FALSE;
    if (cairo_surface_get_type (b) != CAIRO_SURFACE_TYPE_IMAGE)
  return FALSE;

    if (cairo_image_surface_get_height (a) != cairo_image_surface_get_height (b))
  return FALSE;

    if (cairo_image_surface_get_width (a) != cairo_image_surface_get_width (b))
  return FALSE;

    format_a = cairo_image_surface_get_format (a);
    if (format_a == CAIRO_FORMAT_RGB24)
  format_a = CAIRO_FORMAT_ARGB32;

    format_b = cairo_image_surface_get_format (b);
    if (format_b == CAIRO_FORMAT_RGB24)
  format_b = CAIRO_FORMAT_ARGB32;

    if (format_a != format_b)
  return FALSE;

    return TRUE;
}

static csi_status_t
_set_source_image (csi_t *ctx)
{
    csi_status_t status;
    cairo_surface_t *surface;
    cairo_surface_t *source;

    check (2);

    status = _csi_ostack_get_surface (ctx, 0, &source);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 1, &surface);
    if (_csi_unlikely (status))
  return status;

    /* Catch the most frequent use of simply uploading pixel data,
     * principally to remove the pixman ops from the profiles.
     */
    if (_csi_likely (_matching_images (surface, source))) {
  if (cairo_surface_get_reference_count (surface) == 1 &&
      cairo_surface_get_reference_count (source) == 1)
  {
      _csi_peek_ostack (ctx, 0)->datum.surface = surface;
      _csi_peek_ostack (ctx, 1)->datum.surface = source;
  }
  else
  {
      cairo_surface_flush (surface);
      memcpy (cairo_image_surface_get_data (surface),
        cairo_image_surface_get_data (source),
        cairo_image_surface_get_height (source) * cairo_image_surface_get_stride (source));
      cairo_surface_mark_dirty (surface);
  }
    } else {
  cairo_t *cr;

  cr = cairo_create (surface);
  cairo_set_source_surface (cr, source, 0, 0);
  cairo_paint (cr);
  cairo_destroy (cr);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_source_rgb (csi_t *ctx)
{
    csi_status_t status;
    double r,g,b;
    cairo_t *cr;

    check (4);

    status = _csi_ostack_get_number (ctx, 0, &b);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &g);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &r);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 3, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_source_rgb (cr, r, g, b);
    pop (3);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_source_rgba (csi_t *ctx)
{
    csi_status_t status;
    double r,g,b,a;
    cairo_t *cr;

    check (5);

    status = _csi_ostack_get_number (ctx, 0, &a);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &b);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &g);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &r);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 4, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_source_rgba (cr, r, g, b, a);
    pop (4);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_set_tolerance (csi_t *ctx)
{
    csi_status_t status;
    cairo_t *cr;
    double tolerance;

    check (2);

    status = _csi_ostack_get_number (ctx, 0, &tolerance);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_set_tolerance (cr, tolerance);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_transform (csi_t *ctx)
{
    csi_object_t *obj;
    csi_status_t status;
    cairo_matrix_t m;
    int type;

    check (2);

    status = _csi_ostack_get_matrix (ctx, 0, &m);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_transform (obj->datum.cr, &m);
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  {
      cairo_matrix_t ctm;
      cairo_pattern_get_matrix (obj->datum.pattern, &ctm);
      cairo_matrix_multiply (&ctm, &m, &ctm);
      cairo_pattern_set_matrix (obj->datum.pattern, &ctm);
  }
  break;
    case CSI_OBJECT_TYPE_MATRIX:
      cairo_matrix_multiply (&obj->datum.matrix->matrix,
           &m,
           &obj->datum.matrix->matrix);
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_translate (csi_t *ctx)
{
    csi_object_t *obj;
    csi_status_t status;
    double x, y;
    int type;

    check (3);

    status = _csi_ostack_get_number (ctx, 0, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &x);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 2);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_translate (obj->datum.cr, x, y);
  break;

    case CSI_OBJECT_TYPE_PATTERN:
  {
      cairo_matrix_t ctm;
      cairo_pattern_get_matrix (obj->datum.pattern, &ctm);
      cairo_matrix_translate (&ctm, x, y);
      cairo_pattern_set_matrix (obj->datum.pattern, &ctm);
  }
  break;


    case CSI_OBJECT_TYPE_MATRIX:
  cairo_matrix_translate (&obj->datum.matrix->matrix, x, y);
  break;

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_true (csi_t *ctx)
{
    return _csi_push_ostack_boolean (ctx, TRUE);
}

static csi_status_t
_show_page (csi_t *ctx)
{
    csi_object_t *obj;
    int type;

    check (1);

    obj = _csi_peek_ostack (ctx, 0);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_CONTEXT:
  cairo_show_page (obj->datum.cr);
  if (ctx->hooks.copy_page != NULL)
      ctx->hooks.copy_page (ctx->hooks.closure, obj->datum.cr);
  break;
    case CSI_OBJECT_TYPE_SURFACE:
  cairo_surface_show_page (obj->datum.surface);
  /* XXX hook? */
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_similar (csi_t *ctx)
{
    csi_object_t obj;
    long content;
    double width, height;
    cairo_surface_t *other;
    csi_status_t status;

    check (4);

    status = _csi_ostack_get_integer (ctx, 0, &content);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &height);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &width);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 3, &other);
    if (_csi_unlikely (status))
  return status;

    /* silently fix-up a common bug when writing CS */
    if ((content & CAIRO_CONTENT_COLOR_ALPHA) == 0) {
  if (_csi_unlikely (content & ~CAIRO_CONTENT_COLOR_ALPHA))
      return _csi_error (CSI_STATUS_INVALID_SCRIPT);

  switch ((int) content) {
  default:
  case CAIRO_FORMAT_ARGB32:
      content = CAIRO_CONTENT_COLOR_ALPHA;
      break;
  case CAIRO_FORMAT_RGB16_565:
  case CAIRO_FORMAT_RGB24:
      content = CAIRO_CONTENT_COLOR;
      break;
  case CAIRO_FORMAT_A8:
  case CAIRO_FORMAT_A1:
      content = CAIRO_CONTENT_ALPHA;
      break;
  }
    }

    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = cairo_surface_create_similar (other,
                  content, width, height);
    pop (4);
    return push (&obj);
}

static csi_status_t
_similar_image (csi_t *ctx)
{
    csi_object_t obj;
    long format;
    double width, height;
    cairo_surface_t *other;
    csi_status_t status;

    check (4);

    status = _csi_ostack_get_number (ctx, 0, &height);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &width);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_integer (ctx, 2, &format);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 3, &other);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = cairo_surface_create_similar_image (other,
                  format,
                  width, height);
    pop (4);
    return push (&obj);
}

static csi_status_t
_subsurface (csi_t *ctx)
{
    csi_object_t obj;
    double x, y, width, height;
    cairo_surface_t *target;
    csi_status_t status;

    check (5);

    status = _csi_ostack_get_number (ctx, 0, &height);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 1, &width);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 2, &y);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_number (ctx, 3, &x);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 4, &target);
    if (_csi_unlikely (status))
  return status;

    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = cairo_surface_create_for_rectangle (target, x, y, width, height);
    pop (5);
    return push (&obj);
}

static csi_status_t
_show_text (csi_t *ctx)
{
    csi_status_t status;
    csi_string_t *text;
    cairo_t *cr;

    check (2);

    status = _csi_ostack_get_string (ctx, 0, &text);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_show_text (cr, text->string);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_show_glyphs (csi_t *ctx)
{
    csi_array_t *array;
    csi_status_t status;
    cairo_t *cr;
    cairo_glyph_t stack_glyphs[256], *glyphs;
    csi_integer_t nglyphs, i;

    check (2);

    status = _csi_ostack_get_array (ctx, 0, &array);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    /* count glyphs */
    nglyphs = 0;
    for (i = 0; i < array->stack.len; i++) {
  csi_object_t *obj = &array->stack.objects[i];
  int type = csi_object_get_type (obj);
  switch (type) {
  case CSI_OBJECT_TYPE_ARRAY:
      nglyphs += obj->datum.array->stack.len;
      break;
  case CSI_OBJECT_TYPE_STRING:
      nglyphs += obj->datum.string->len;
      break;
  }
    }
    if (nglyphs == 0) {
  pop (1);
  return CSI_STATUS_SUCCESS;
    }

    if (nglyphs > ARRAY_LENGTH (stack_glyphs)) {
  if (_csi_unlikely ((unsigned) nglyphs >= INT_MAX / sizeof (cairo_glyph_t)))
      return _csi_error (CSI_STATUS_NO_MEMORY);

  glyphs = _csi_alloc (ctx, sizeof (cairo_glyph_t) * nglyphs);
  if (_csi_unlikely (glyphs == NULL))
      return _csi_error (CSI_STATUS_NO_MEMORY);
    } else
  glyphs = stack_glyphs;

    nglyphs = _glyph_string (ctx, array, cairo_get_scaled_font (cr), glyphs);
    cairo_show_glyphs (cr, glyphs, nglyphs);

    if (glyphs != stack_glyphs)
  _csi_free (ctx, glyphs);

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_show_text_glyphs (csi_t *ctx)
{
    csi_object_t *obj;
    csi_array_t *array;
    csi_string_t *string;
    csi_string_t *utf8_string;
    csi_status_t status;
    cairo_t *cr;
    cairo_text_cluster_t stack_clusters[256], *clusters;
    cairo_glyph_t stack_glyphs[256], *glyphs;
    csi_integer_t nglyphs, nclusters, i;
    long direction;
    int type;

    check (5);

    status = _csi_ostack_get_integer (ctx, 0, &direction);
    if (_csi_unlikely (status))
  return status;

    obj = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (obj);
    switch (type) {
    case CSI_OBJECT_TYPE_ARRAY:
  array = obj->datum.array;
  nclusters = array->stack.len / 2;
  if (nclusters > ARRAY_LENGTH (stack_clusters)) {
      if (_csi_unlikely ((unsigned) nclusters >= INT_MAX / sizeof (cairo_text_cluster_t)))
    return _csi_error (CSI_STATUS_NO_MEMORY);
      clusters = _csi_alloc (ctx, sizeof (cairo_text_cluster_t) * nclusters);
      if (_csi_unlikely (clusters == NULL))
    return _csi_error (CSI_STATUS_NO_MEMORY);
  } else
      clusters = stack_clusters;

  for (i = 0; i < nclusters; i++) {
      clusters[i].num_bytes = csi_number_get_value (&array->stack.objects[2*i+0]);
      clusters[i].num_glyphs = csi_number_get_value (&array->stack.objects[2*i+1]);
  }
  break;

    case CSI_OBJECT_TYPE_STRING:
  string = obj->datum.string;
  nclusters = string->len / 2;
  if (nclusters > ARRAY_LENGTH (stack_clusters)) {
      if (_csi_unlikely ((unsigned) nclusters >= INT_MAX / sizeof (cairo_text_cluster_t)))
    return _csi_error (CSI_STATUS_NO_MEMORY);
      clusters = _csi_alloc (ctx, sizeof (cairo_text_cluster_t) * nclusters);
      if (_csi_unlikely (clusters == NULL))
    return _csi_error (CSI_STATUS_NO_MEMORY);
  } else
      clusters = stack_clusters;

  for (i = 0; i < nclusters; i++) {
      clusters[i].num_bytes = string->string[2*i+0];
      clusters[i].num_glyphs = string->string[2*i+1];
  }
  break;

    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    status = _csi_ostack_get_array (ctx, 2, &array);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_string (ctx, 3, &utf8_string);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 4, &cr);
    if (_csi_unlikely (status))
  return status;

    /* count glyphs */
    nglyphs = 0;
    for (i = 0; i < array->stack.len; i++) {
  obj = &array->stack.objects[i];
  type = csi_object_get_type (obj);
  switch (type) {
  case CSI_OBJECT_TYPE_ARRAY:
      nglyphs += obj->datum.array->stack.len;
      break;
  case CSI_OBJECT_TYPE_STRING:
      nglyphs += obj->datum.string->len;
      break;
  }
    }
    if (nglyphs == 0) {
  pop (4);
  return CSI_STATUS_SUCCESS;
    }

    if (nglyphs > ARRAY_LENGTH (stack_glyphs)) {
  if (_csi_unlikely ((unsigned) nglyphs >= INT_MAX / sizeof (cairo_glyph_t)))
      return _csi_error (CSI_STATUS_NO_MEMORY);

  glyphs = _csi_alloc (ctx, sizeof (cairo_glyph_t) * nglyphs);
  if (_csi_unlikely (glyphs == NULL))
      return _csi_error (CSI_STATUS_NO_MEMORY);
    } else
  glyphs = stack_glyphs;

    nglyphs = _glyph_string (ctx, array, cairo_get_scaled_font (cr), glyphs);
    cairo_show_text_glyphs (cr,
          utf8_string->string, utf8_string->len,
          glyphs, nglyphs,
          clusters, nclusters,
          direction);

    if (clusters != stack_clusters)
  _csi_free (ctx, clusters);
    if (glyphs != stack_glyphs)
  _csi_free (ctx, glyphs);

    pop (4);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_stroke (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_stroke);
}

static csi_status_t
_stroke_preserve (csi_t *ctx)
{
    return _do_cairo_op (ctx, cairo_stroke_preserve);
}

static csi_status_t
_sub (csi_t *ctx)
{
    csi_object_t *A;
    csi_object_t *B;
    csi_object_type_t type_a, type_b;

    check (2);

    B = _csi_peek_ostack (ctx, 0);
    A = _csi_peek_ostack (ctx, 1);

    type_a = csi_object_get_type (A);
    if (_csi_unlikely (! (type_a == CSI_OBJECT_TYPE_INTEGER ||
          type_a == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    type_b = csi_object_get_type (B);
    if (_csi_unlikely (! (type_b == CSI_OBJECT_TYPE_INTEGER ||
          type_b == CSI_OBJECT_TYPE_REAL)))
    {
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (2);

    if (type_a == CSI_OBJECT_TYPE_REAL &&
  type_b == CSI_OBJECT_TYPE_REAL)
    {
  return _csi_push_ostack_real (ctx, A->datum.real - B->datum.real);

    }
    else if (type_a == CSI_OBJECT_TYPE_INTEGER &&
       type_b == CSI_OBJECT_TYPE_INTEGER)
    {
  return _csi_push_ostack_integer (ctx,
           A->datum.integer - B->datum.integer);
    }
    else
    {
  double v;

  if (type_a == CSI_OBJECT_TYPE_REAL)
      v = A->datum.real;
  else
      v = A->datum.integer;

  if (type_b == CSI_OBJECT_TYPE_REAL)
      v -= B->datum.real;
  else
      v -= B->datum.integer;

  return _csi_push_ostack_real (ctx, v);
    }
}

static csi_status_t
_surface (csi_t *ctx)
{
    csi_object_t obj;
    csi_dictionary_t *dict;
    csi_proxy_t *proxy;
    csi_object_t key;
    double width, height;
    csi_surface_create_func_t hook;
    long content;
    cairo_surface_t *surface;
    long uid;
    csi_status_t status;

    check (1);

    status = _csi_ostack_get_dictionary (ctx, 0, &dict);
    if (_csi_unlikely (status))
  return status;

    status = _csi_dictionary_get_number (ctx, dict, "width", FALSE, &width);
    if (_csi_unlikely (status))
  return status;
    status = _csi_dictionary_get_number (ctx, dict, "height", FALSE, &height);
    if (_csi_unlikely (status))
  return status;

    content = CAIRO_CONTENT_COLOR_ALPHA;
    status = _csi_dictionary_get_integer (ctx, dict, "content", TRUE, &content);
    if (_csi_unlikely (status))
  return status;

    uid = 0;
    status = _csi_dictionary_get_integer (ctx, dict, "uid", TRUE, &uid);
    if (_csi_unlikely (status))
  return status;
    if (uid == 0) {
  status = _csi_dictionary_get_integer (ctx, dict, "drawable", TRUE, &uid);
  if (_csi_unlikely (status))
      return status;
    }

    hook = ctx->hooks.surface_create;
    assert (hook != NULL);

    surface = hook (ctx->hooks.closure, content, width, height, uid);
    if (_csi_unlikely (surface == NULL)) {
  return _csi_error (CSI_STATUS_NULL_POINTER);
    }

    proxy = _csi_proxy_create (ctx, surface, dict,
             ctx->hooks.surface_destroy,
             ctx->hooks.closure);
    if (_csi_unlikely (proxy == NULL)) {
  cairo_surface_destroy (surface);
  return _csi_error (CSI_STATUS_NO_MEMORY);
    }

    status = cairo_surface_set_user_data (surface,
            &_csi_proxy_key,
            proxy, _csi_proxy_destroy);
    if (_csi_unlikely (status)) {
  _csi_proxy_destroy (proxy);
  cairo_surface_destroy (surface);
  return status;
    }

    status = csi_name_new_static (ctx, &key, "fallback-resolution");
    if (_csi_unlikely (status)) {
  cairo_surface_destroy (surface);
  return status;
    }
    if (csi_dictionary_has (dict, key.datum.name)) {
  status = csi_dictionary_get (ctx, dict, key.datum.name, &obj);
  if (_csi_unlikely (status)) {
      cairo_surface_destroy (surface);
      return status;
  }
  if (csi_object_get_type (&obj) == CSI_OBJECT_TYPE_ARRAY) {
      csi_array_t *array = obj.datum.array;
      if (array->stack.len == 2) {
    cairo_surface_set_fallback_resolution (surface,
                   csi_number_get_value
                   (&array->stack.objects[0]),
                   csi_number_get_value
                   (&array->stack.objects[1]));
      }
  }
    }
    /* initialise surface to source */
    status = csi_name_new_static (ctx, &key, "source");
    if (_csi_unlikely (status)) {
  cairo_surface_destroy (surface);
  return status;
    }
    if (csi_dictionary_has (dict, key.datum.name)) {
  cairo_surface_t *image;
  cairo_t *cr;

  status = _image_load_from_dictionary (ctx, dict, &image);
  if (_csi_unlikely (status)) {
      cairo_surface_destroy (surface);
      return status;
  }

  cr = cairo_create (surface);
  cairo_set_source_surface (cr, image, 0, 0);
  cairo_surface_destroy (image);
  cairo_paint (cr);
  status = cairo_status (cr);
  cairo_destroy (cr);

  if (_csi_unlikely (status))
      return status;
    }

    status = csi_name_new_static (ctx, &key, "device-offset");
    if (_csi_unlikely (status)) {
  cairo_surface_destroy (surface);
  return status;
    }
    if (csi_dictionary_has (dict, key.datum.name)) {
  status = csi_dictionary_get (ctx, dict, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return status;

  if (csi_object_get_type (&obj) == CSI_OBJECT_TYPE_ARRAY) {
      csi_array_t *array = obj.datum.array;

      if (array->stack.len == 2) {
    cairo_surface_set_device_offset (surface,
             csi_number_get_value
             (&array->stack.objects[0]),
             csi_number_get_value
             (&array->stack.objects[1]));
      }
  }
    }

    status = csi_name_new_static (ctx, &key, "device-scale");
    if (_csi_unlikely (status)) {
  cairo_surface_destroy (surface);
  return status;
    }
    if (csi_dictionary_has (dict, key.datum.name)) {
  status = csi_dictionary_get (ctx, dict, key.datum.name, &obj);
  if (_csi_unlikely (status))
      return status;

  if (csi_object_get_type (&obj) == CSI_OBJECT_TYPE_ARRAY) {
      csi_array_t *array = obj.datum.array;

      if (array->stack.len == 2) {
    cairo_surface_set_device_scale (surface,
            csi_number_get_value
            (&array->stack.objects[0]),
            csi_number_get_value
            (&array->stack.objects[1]));
      }
  }
    }

    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = surface;
    pop (1);
    return push (&obj);
}

static csi_status_t
_record (csi_t *ctx)
{
    csi_object_t obj;
    long content;
    csi_array_t *array;
    csi_status_t status;
    cairo_rectangle_t extents;
    cairo_rectangle_t *r;

    check (2);

    status = _csi_ostack_get_array (ctx, 0, &array);
    if (_csi_unlikely (status))
  return status;

    status = _csi_ostack_get_integer (ctx, 1, &content);
    if (_csi_unlikely (status))
  return status;

    switch (array->stack.len) {
    case 0:
  r = NULL;
  break;
    case 2:
  extents.x = extents.y = 0;
  extents.width = _csi_object_as_real (&array->stack.objects[0]);
  extents.height = _csi_object_as_real (&array->stack.objects[1]);
  r = &extents;
  break;
    case 4:
  extents.x = _csi_object_as_real (&array->stack.objects[0]);
  extents.y = _csi_object_as_real (&array->stack.objects[1]);
  extents.width = _csi_object_as_real (&array->stack.objects[2]);
  extents.height = _csi_object_as_real (&array->stack.objects[3]);
  r = &extents;
  break;
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    obj.type = CSI_OBJECT_TYPE_SURFACE;
    obj.datum.surface = cairo_recording_surface_create (content, r);
    pop (2);
    return push (&obj);
}

static csi_status_t
_text_path (csi_t *ctx)
{
    csi_status_t status;
    csi_string_t *text;
    cairo_t *cr;

    check (2);

    status = _csi_ostack_get_string (ctx, 0, &text);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_context (ctx, 1, &cr);
    if (_csi_unlikely (status))
  return status;

    cairo_text_path (cr, text->string);
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_undef (csi_t *ctx)
{
    csi_name_t name = 0; /* silence the compiler */
    csi_status_t status;

    check (1);

    status = _csi_ostack_get_name (ctx, 0, &name);
    if (_csi_unlikely (status))
  return status;

    status = _csi_name_undefine (ctx, name);
    if (_csi_unlikely (status))
  return status;

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_unset (csi_t *ctx)
{
    csi_object_t *dst;
    csi_name_t name = 0; /* silence the compiler */
    csi_status_t status;
    int type;

    check (2);

    status = _csi_ostack_get_name (ctx, 0, &name);
    if (_csi_unlikely (status))
  return status;

    dst = _csi_peek_ostack (ctx, 1);
    type = csi_object_get_type (dst);
    switch (type) {
    case CSI_OBJECT_TYPE_DICTIONARY:
  csi_dictionary_remove (ctx, dst->datum.dictionary, name);
  break;
    case CSI_OBJECT_TYPE_STRING:
    case CSI_OBJECT_TYPE_ARRAY:
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_write_to_png (csi_t *ctx)
{
    csi_status_t status;
    csi_string_t *filename;
    cairo_surface_t *surface;

    check (2);

    status = _csi_ostack_get_string (ctx, 0, &filename);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 1, &surface);
    if (_csi_unlikely (status))
  return status;

#if CAIRO_HAS_PNG_FUNCTIONS
    status = cairo_surface_write_to_png (surface, filename->string);
    if (_csi_unlikely (status))
  return status;
#else
    return CAIRO_STATUS_WRITE_ERROR;
#endif

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_write_to_script (csi_t *ctx)
{
    csi_status_t status;
    csi_string_t *filename;
    cairo_surface_t *record;

    check (2);

    status = _csi_ostack_get_string (ctx, 0, &filename);
    if (_csi_unlikely (status))
  return status;
    status = _csi_ostack_get_surface (ctx, 1, &record);
    if (_csi_unlikely (status))
  return status;

    if (cairo_surface_get_type (record) != CAIRO_SURFACE_TYPE_RECORDING)
  return CAIRO_STATUS_SURFACE_TYPE_MISMATCH;

#if CAIRO_HAS_SCRIPT_SURFACE
    {
  cairo_device_t *script;

  script = cairo_script_create (filename->string);
  status = cairo_script_from_recording_surface (script, record);
  cairo_device_destroy (script);
  if (_csi_unlikely (status))
      return status;
    }
#else
    return CAIRO_STATUS_WRITE_ERROR;
#endif

    pop (1);
    return CSI_STATUS_SUCCESS;
}

static csi_status_t
_xor (csi_t *ctx)
{
    csi_object_t *a, *b;
    int type;

    check (2);

    a = _csi_peek_ostack (ctx, 0);
    b = _csi_peek_ostack (ctx, 1);
    if (_csi_unlikely (csi_object_get_type (a) != csi_object_get_type (b)))
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);

    pop (2);
    type = csi_object_get_type (a);
    switch (type) {
    case CSI_OBJECT_TYPE_INTEGER:
  return _csi_push_ostack_integer (ctx,
           a->datum.integer ^ b->datum.integer);
    case CSI_OBJECT_TYPE_BOOLEAN:
  return _csi_push_ostack_boolean (ctx,
           a->datum.boolean ^ b->datum.boolean);
    default:
  return _csi_error (CSI_STATUS_INVALID_SCRIPT);
    }
}

static csi_status_t
_debug_print (csi_t *ctx)
{
    csi_object_t *obj;

    check (1);
    obj = _csi_peek_ostack (ctx, 0);
    switch (csi_object_get_type (obj)) {
    case CSI_OBJECT_TYPE_NULL:
  fprintf (stderr, "NULL\n");
  break;

  /* atomics */
    case CSI_OBJECT_TYPE_BOOLEAN:
  fprintf (stderr, "boolean: %s\n",
     obj->datum.boolean ? "true" : "false");
  break;
    case CSI_OBJECT_TYPE_INTEGER:
  fprintf (stderr, "integer: %ld\n", obj->datum.integer);
  break;
    case CSI_OBJECT_TYPE_MARK:
  fprintf (stderr, "mark\n");
  break;
    case CSI_OBJECT_TYPE_NAME:
  fprintf (stderr, "name: %s\n", (char *) obj->datum.name);
  break;
    case CSI_OBJECT_TYPE_OPERATOR:
  fprintf (stderr, "operator: %p\n", obj->datum.ptr);
  break;
    case CSI_OBJECT_TYPE_REAL:
  fprintf (stderr, "real: %g\n", obj->datum.real);
  break;

  /* compound */
    case CSI_OBJECT_TYPE_ARRAY:
  fprintf (stderr, "array\n");
  break;
    case CSI_OBJECT_TYPE_DICTIONARY:
  fprintf (stderr, "dictionary\n");
  break;
    case CSI_OBJECT_TYPE_FILE:
  fprintf (stderr, "file\n");
  break;
    case CSI_OBJECT_TYPE_MATRIX:
  fprintf (stderr, "matrix: [%g %g %g %g %g %g]\n",
     obj->datum.matrix->matrix.xx,
     obj->datum.matrix->matrix.yx,
     obj->datum.matrix->matrix.xy,
     obj->datum.matrix->matrix.yy,
     obj->datum.matrix->matrix.x0,
     obj->datum.matrix->matrix.y0);
  break;
    case CSI_OBJECT_TYPE_STRING:
  fprintf (stderr, "string: %s\n", obj->datum.string->string);
  break;

  /* cairo */
    case CSI_OBJECT_TYPE_CONTEXT:
  fprintf (stderr, "context\n");
  break;
    case CSI_OBJECT_TYPE_FONT:
  fprintf (stderr, "font\n");
  break;
    case CSI_OBJECT_TYPE_PATTERN:
  fprintf (stderr, "pattern\n");
  break;
    case CSI_OBJECT_TYPE_SCALED_FONT:
  fprintf (stderr, "scaled-font\n");
  break;
    case CSI_OBJECT_TYPE_SURFACE:
  fprintf (stderr, "surface\n");
  break;
    }
    pop (1);
    return CSI_STATUS_SUCCESS;
}

static const csi_operator_def_t
_defs[] = {
    { "<<", _mark },
    { ">>", end_dict_construction },
    { "[", _mark },
    { "]", end_array_construction },
    { "a", _alpha },
    { "abs", NULL },
    { "add", _add },
    { "add-color-stop", _add_color_stop },
    { "and", _and },
    { "arc", _arc },
    { "arc-negative", _arc_negative },
    { "arc-", _arc_negative },
    { "arc-to", NULL },
    { "array", _array },
    { "astore", NULL },
    { "atan", NULL },
    { "bind", _bind },
    { "bitshift", _bitshift },
    { "c", _curve_to },
    { "C", _rel_curve_to },
    { "ceiling", NULL },
    { "clear", NULL },
    { "clear-to-mark", NULL },
    { "clip", _clip },
    { "clip-extents", NULL },
    { "clip-preserve", _clip_preserve },
    { "clip+", _clip_preserve },
    { "close-path", _close_path },
    { "context", _context },
    { "copy", _copy },
    { "copy-page", _copy_page },
    { "cos", NULL },
    { "count", NULL },
    { "count-to-mark", NULL },
    { "curve-to", _curve_to },
    { "cvi", _cvi },
    { "cvr", _cvr },
    { "def", _def },
    { "device-to-user", NULL },
    { "device-to-user-distance", NULL },
    { "dict", _dict },
    { "div", _div },
    { "dup", _duplicate },
    { "eq", _eq },
    { "exch", _exch },
    { "exec", NULL },
    { "exp", NULL },
    { "false", _false },
    { "fill", _fill },
    { "fill-extents", NULL },
    { "fill-preserve", _fill_preserve },
    { "fill+", _fill_preserve },
    { "filter", _filter },
    { "floor", NULL },
    { "font", _font },
    { "for", _for },
    { "forall", NULL },
    { "g", _gray },
    { "ge", _ge },
    { "get", _get },
    { "glyph-path", _glyph_path },
    { "gt", _gt },
    { "h", _close_path },
    { "identity", _identity },
    { "if", _if },
    { "ifelse", _ifelse },
    { "image", _image },
    { "index", _index },
    { "integer", _integer },
    { "invert", _invert },
    { "in-stroke", NULL },
    { "in-fill", NULL },
    { "known", NULL },
    { "l", _line_to },
    { "L", _rel_line_to },
    { "languagelevel", NULL },
    { "le", _le },
    { "length", NULL },
    { "linear", _linear },
    { "line-to", _line_to },
    { "ln", NULL },
    { "load", NULL },
    { "log", NULL },
    { "loop", NULL },
    { "lt", _lt },
    { "m", _move_to },
    { "M", _rel_move_to },
    { "map-to-image", _map_to_image },
    { "mark", _mark },
    { "mask", _mask },
    { "matrix", _matrix },

    { "mesh", _mesh },
    { "begin-patch", _mesh_begin_patch },
    { "end-patch", _mesh_end_patch },
    { "set-control-point", _mesh_set_control_point },
    { "set-corner-color", _mesh_set_corner_color },

    { "mod", _mod },
    { "move-to", _move_to },
    { "mul", _mul },
    { "multiply", NULL },
    { "n", _new_path },
    { "N", _new_sub_path },
    { "ne", _ne },
    { "neg", _neg },
    { "new-path", _new_path },
    { "new-sub-path", _new_sub_path },
    { "not", _not },
    { "null", _null },
    { "or", _or },
    { "paint", _paint },
    { "paint-with-alpha", _paint_with_alpha },
    { "pattern", _pattern },
    { "pop", _pop },
    { "pop-group", _pop_group },
    { "push-group", _push_group },
    { "radial", _radial },
    { "rand", NULL },
    { "record", _record },
    { "rectangle", _rectangle },
    { "repeat", _repeat },
    { "restore", _restore },
    { "rel-curve-to", _rel_curve_to },
    { "rel-line-to", _rel_line_to },
    { "rel-move-to", _rel_move_to },
    { "reset-clip", _reset_clip },
    { "rgb", _rgb },
    { "rgba", _rgba },
    { "roll", _roll },
    { "rotate", _rotate },
    { "round", NULL },
    { "run", NULL },
    { "save", _save },
    { "scale", _scale },
    { "scaled-font", _scaled_font },
    { "select-font-face", _select_font_face },
    { "set", _set },
    { "set-antialias", _set_antialias },
    { "set-dash", _set_dash },
    { "set-device-offset", _set_device_offset },
    { "set-device-scale", _set_device_scale },
    { "set-extend", _set_extend },
    { "set-fallback-resolution", _set_fallback_resolution },
    { "set-fill-rule", _set_fill_rule },
    { "set-filter", _set_filter },
    { "set-font-face", _set_font_face },
    { "set-font-options", _set_font_options },
    { "set-font-matrix", _set_font_matrix },
    { "set-font-size", _set_font_size },
    { "set-line-cap", _set_line_cap },
    { "set-line-join", _set_line_join },
    { "set-line-width", _set_line_width },
    { "set-hairline", _set_hairline },
    { "set-matrix", _set_matrix },
    { "set-miter-limit", _set_miter_limit },
    { "set-mime-data", _set_mime_data },
    { "set-operator", _set_operator },
    { "set-scaled-font", _set_scaled_font },
    { "set-source", _set_source },
    { "set-source-image", _set_source_image },
    { "set-source-rgb", _set_source_rgb },
    { "set-source-rgba", _set_source_rgba },
    { "set-tolerance", _set_tolerance },
    { "show-glyphs", _show_glyphs },
    { "show-text", _show_text },
    { "show-text-glyphs", _show_text_glyphs },
    { "show-page", _show_page },
    { "similar", _similar },
    { "similar-image", _similar_image },
    { "sin", NULL },
    { "sqrt", NULL },
    { "sub", _sub },
    { "subsurface", _subsurface },
    { "surface", _surface },
    { "string", NULL },
    { "stroke", _stroke },
    { "stroke-extents", NULL },
    { "stroke-preserve", _stroke_preserve },
    { "stroke+", _stroke_preserve },
    { "text-path", _text_path },
    { "transform", _transform },
    { "transform-distance", NULL },
    { "transform-point", NULL },
    { "translate", _translate },
    { "true", _true },
    { "type", NULL },
    { "undef", _undef },
    { "unmap-image", _unmap_image },
    { "unset", _unset },
    { "user-to-device", NULL },
    { "user-to-device-distance", NULL },
    { "where", NULL },
    { "write-to-png", _write_to_png },
    { "write-to-script", _write_to_script },
    { "xor", _xor },

    { "=", _debug_print },

    { NULL, NULL },
};

const csi_operator_def_t *
_csi_operators (void)
{
    return _defs;
}

static const csi_integer_constant_def_t
_integer_constants[] = {
    { "CLEAR",    CAIRO_OPERATOR_CLEAR },
    { "SOURCE",   CAIRO_OPERATOR_SOURCE },
    { "OVER",   CAIRO_OPERATOR_OVER },
    { "IN",   CAIRO_OPERATOR_IN },
    { "OUT",    CAIRO_OPERATOR_OUT },
    { "ATOP",   CAIRO_OPERATOR_ATOP },
    { "DEST",   CAIRO_OPERATOR_DEST },
    { "DEST_OVER",  CAIRO_OPERATOR_DEST_OVER },
    { "DEST_IN",  CAIRO_OPERATOR_DEST_IN },
    { "DEST_OUT", CAIRO_OPERATOR_DEST_OUT },
    { "DEST_ATOP",  CAIRO_OPERATOR_DEST_ATOP },
    { "XOR",    CAIRO_OPERATOR_XOR },
    { "ADD",    CAIRO_OPERATOR_ADD },
    { "SATURATE", CAIRO_OPERATOR_SATURATE },
    { "MULTIPLY", CAIRO_OPERATOR_MULTIPLY },
    { "SCREEN",   CAIRO_OPERATOR_SCREEN },
    { "OVERLAY",  CAIRO_OPERATOR_OVERLAY },
    { "DARKEN",   CAIRO_OPERATOR_DARKEN },
    { "LIGHTEN",  CAIRO_OPERATOR_LIGHTEN },
    { "DODGE",    CAIRO_OPERATOR_COLOR_DODGE },
    { "BURN",   CAIRO_OPERATOR_COLOR_BURN },
    { "HARD_LIGHT", CAIRO_OPERATOR_HARD_LIGHT },
    { "SOFT_LIGHT", CAIRO_OPERATOR_SOFT_LIGHT },
    { "DIFFERENCE", CAIRO_OPERATOR_DIFFERENCE },
    { "EXCLUSION",  CAIRO_OPERATOR_EXCLUSION },
    { "HSL_HUE",  CAIRO_OPERATOR_HSL_HUE },
    { "HSL_SATURATION", CAIRO_OPERATOR_HSL_SATURATION },
    { "HSL_COLOR",  CAIRO_OPERATOR_HSL_COLOR },
    { "HSL_LUMINOSITY", CAIRO_OPERATOR_HSL_LUMINOSITY },

    { "WINDING",  CAIRO_FILL_RULE_WINDING },
    { "EVEN_ODD", CAIRO_FILL_RULE_EVEN_ODD },

    { "ANTIALIAS_DEFAULT",  CAIRO_ANTIALIAS_DEFAULT },
    { "ANTIALIAS_NONE",   CAIRO_ANTIALIAS_NONE },
    { "ANTIALIAS_GRAY",   CAIRO_ANTIALIAS_GRAY },
    { "ANTIALIAS_SUBPIXEL", CAIRO_ANTIALIAS_SUBPIXEL },
    { "ANTIALIAS_FAST",   CAIRO_ANTIALIAS_FAST },
    { "ANTIALIAS_GOOD",   CAIRO_ANTIALIAS_GOOD },
    { "ANTIALIAS_BEST",   CAIRO_ANTIALIAS_BEST },

    { "LINE_CAP_BUTT",    CAIRO_LINE_CAP_BUTT },
    { "LINE_CAP_ROUND",   CAIRO_LINE_CAP_ROUND },
    { "LINE_CAP_SQUARE",  CAIRO_LINE_CAP_SQUARE },

    { "LINE_JOIN_MITER",  CAIRO_LINE_JOIN_MITER },
    { "LINE_JOIN_ROUND",  CAIRO_LINE_JOIN_ROUND },
    { "LINE_JOIN_BEVEL",  CAIRO_LINE_JOIN_BEVEL },

    { "EXTEND_NONE",    CAIRO_EXTEND_NONE },
    { "EXTEND_REPEAT",    CAIRO_EXTEND_REPEAT },
    { "EXTEND_REFLECT",   CAIRO_EXTEND_REFLECT },
    { "EXTEND_PAD",   CAIRO_EXTEND_PAD },

    { "FILTER_FAST",    CAIRO_FILTER_FAST },
    { "FILTER_GOOD",    CAIRO_FILTER_GOOD },
    { "FILTER_BEST",    CAIRO_FILTER_BEST },
    { "FILTER_BILINEAR",  CAIRO_FILTER_BILINEAR },
    { "FILTER_NEAREST",   CAIRO_FILTER_NEAREST },
    { "FILTER_GAUSSIAN",  CAIRO_FILTER_GAUSSIAN },

    { "SLANT_NORMAL",   CAIRO_FONT_SLANT_NORMAL },
    { "SLANT_ITALIC",   CAIRO_FONT_SLANT_ITALIC },
    { "SLANT_OBLIQUE",    CAIRO_FONT_SLANT_OBLIQUE },

    { "WEIGHT_NORMAL",    CAIRO_FONT_WEIGHT_NORMAL },
    { "WEIGHT_BOLD",    CAIRO_FONT_WEIGHT_BOLD },

    { "SUBPIXEL_ORDER_DEFAULT", CAIRO_SUBPIXEL_ORDER_DEFAULT },
    { "SUBPIXEL_ORDER_RGB", CAIRO_SUBPIXEL_ORDER_RGB },
    { "SUBPIXEL_ORDER_BGR", CAIRO_SUBPIXEL_ORDER_BGR },
    { "SUBPIXEL_ORDER_VRGB",  CAIRO_SUBPIXEL_ORDER_VRGB },
    { "SUBPIXEL_ORDER_VBGR",  CAIRO_SUBPIXEL_ORDER_VBGR },

    { "HINT_STYLE_DEFAULT", CAIRO_HINT_STYLE_DEFAULT },
    { "HINT_STYLE_NONE",  CAIRO_HINT_STYLE_NONE },
    { "HINT_STYLE_SLIGHT",  CAIRO_HINT_STYLE_SLIGHT },
    { "HINT_STYLE_MEDIUM",  CAIRO_HINT_STYLE_MEDIUM },
    { "HINT_STYLE_FULL",  CAIRO_HINT_STYLE_FULL },

    { "HINT_METRICS_DEFAULT", CAIRO_HINT_METRICS_DEFAULT },
    { "HINT_METRICS_OFF", CAIRO_HINT_METRICS_OFF },
    { "HINT_METRICS_ON",  CAIRO_HINT_METRICS_ON },

    { "FORWARD",    0 },
    { "BACKWARD",   1 },

    { "COLOR",      CAIRO_CONTENT_COLOR },
    { "ALPHA",      CAIRO_CONTENT_ALPHA },
    { "COLOR_ALPHA",    CAIRO_CONTENT_COLOR_ALPHA },

    { "A1",     CAIRO_FORMAT_A1 },
    { "A8",     CAIRO_FORMAT_A8 },
    { "RGB16_565",    CAIRO_FORMAT_RGB16_565 },
    { "RGB24",      CAIRO_FORMAT_RGB24 },
    { "ARGB32",     CAIRO_FORMAT_ARGB32 },
    { "RGB30",      CAIRO_FORMAT_RGB30 },
    { "RGB96F",     CAIRO_FORMAT_RGB96F },
    { "RGBA128F",   CAIRO_FORMAT_RGBA128F },
    { "INVALID",    CAIRO_FORMAT_INVALID },

    { NULL, 0 }
};


const csi_integer_constant_def_t *
_csi_integer_constants (void)
{
    return _integer_constants;
}

static const csi_real_constant_def_t
_real_constants[] = {
    { "math.pi",    M_PI },
    { "math.2pi",   2 * M_PI },
    { "math.sqrt2",   M_SQRT2 },
    { "math.ln2",   M_LN2 },

    { NULL, 0 }
};

const csi_real_constant_def_t *
_csi_real_constants (void)
{
    return _real_constants;
}

Coverage Report

Created: 2026-10-17 07:00