/* Copyright (C) 2001-2024 Artifex Software, Inc.

   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or

   implied.

   This software is distributed under license and may not be copied,

   modified or distributed except as expressly authorized under the terms

   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact

   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,

   CA 94129, USA, for further information.

*/

/* Level 2 character operators */

#include "ghost.h"

#include "oper.h"

#include "gsmatrix.h"   /* for gxfont.h */

#include "gstext.h"

#include "gxfixed.h"    /* for gxfont.h */

#include "gxfont.h"

#include "gxtext.h"

#include "ialloc.h"

#include "ichar.h"

#include "igstate.h"

#include "iname.h"

#include "ibnum.h"

#include "estack.h"

#include "memory_.h"

/* Common setup for glyphshow and .glyphwidth. */

static int

glyph_show_setup(i_ctx_t *i_ctx_p, gs_glyph *pglyph)

{

    os_ptr op = osp;

    check_op(1);

    switch (gs_currentfont(igs)->FontType) {

        case ft_CID_encrypted:

        case ft_CID_user_defined:

        case ft_CID_TrueType:

        case ft_CID_bitmap:

            check_int_leu(*op, GS_MAX_GLYPH - GS_MIN_CID_GLYPH);

            *pglyph = (gs_glyph) op->value.intval + GS_MIN_CID_GLYPH;

            break;

        default:

            check_type(*op, t_name);

            *pglyph = name_index(imemory, op);

    }

    return op_show_enum_setup(i_ctx_p);

}

/* <charname> glyphshow - */

static int

zglyphshow(i_ctx_t *i_ctx_p)

{

    es_ptr ep = esp;        /* Save in case of error */

    gs_glyph glyph = GS_NO_GLYPH;

    gs_text_enum_t *penum;

    int code;

    if ((code = glyph_show_setup(i_ctx_p, &glyph)) != 0)

        return code;

    if ((code = gs_glyphshow_begin(igs, glyph, imemory_local, &penum)) < 0)

        return code;

    *(op_proc_t *)&penum->enum_client_data = zglyphshow;

    if ((code = op_show_finish_setup(i_ctx_p, penum, 1, NULL)) < 0) {

        ifree_object(penum, "zglyphshow");

        return code;

    }

    code = op_show_continue_pop(i_ctx_p, 1);

    if (code < 0) {

        /* We must restore the exec stack pointer back to the point where we entered, in case

         * we 'retry' the operation (eg having increased the operand stack).

         * We'll rely on gc to handle the enumerator.

         * Bug #700618/#707485

         */

        esp = ep;

    }

    return code;

}

/* <string> <numarray|numstring> xshow - */

/* <string> <numarray|numstring> yshow - */

/* <string> <numarray|numstring> xyshow - */

static int

moveshow(i_ctx_t *i_ctx_p, bool have_x, bool have_y)

{

    os_ptr op = osp;

    gs_text_enum_t *penum = NULL;

    int code;

    int format;

    uint i, size, widths_needed;

    float *values;

    bool CPSI_mode = gs_currentcpsimode(imemory);

    check_op(2);

    code = op_show_setup(i_ctx_p, op - 1);

    if (code != 0)

        return code;

    format = num_array_format(op);

    if (format < 0)

        return format;

    size = num_array_size(op, format);

    values = (float *)ialloc_byte_array(size, sizeof(float), "moveshow");

    if (values == 0)

        return_error(gs_error_VMerror);

    if (CPSI_mode)

        memset(values, 0, size * sizeof(values[0])); /* Safety. */

    if ((code = gs_xyshow_begin(igs, op[-1].value.bytes, r_size(op - 1),

                                (have_x ? values : (float *)0),

                                (have_y ? values : (float *)0),

                                size, imemory_local, &penum)) < 0) {

        ifree_object(values, "moveshow");

        if (penum) /* if there was an error, the text_enum may not have been allocated */

            penum->text.x_widths = penum->text.y_widths = NULL;

        return code;

    }

    if (CPSI_mode) {

        /* CET 13-29.PS page 2 defines a longer width array

           then the text requires, and CPSI silently ignores extra elements.

           So we need to compute exact number of characters

           to know how many elements to load and type check. */

        code = gs_text_count_chars(igs, gs_get_text_params(penum), imemory);

        if (code < 0)

            return code;

        widths_needed = code;

        if (have_x && have_y)

            widths_needed <<= 1;

    } else

        widths_needed = size;

    for (i = 0; i < widths_needed; ++i) {

        ref value;

        switch (code = num_array_get(imemory, op, format, i, &value)) {

        case t_integer:

            values[i] = (float)value.value.intval; break;

        case t_real:

            values[i] = value.value.realval; break;

        case t_null:

            code = gs_note_error(gs_error_rangecheck);

            /* falls through */

        default:

            ifree_object(values, "moveshow");

        penum->text.x_widths = penum->text.y_widths = NULL;

            return code;

        }

    }

    if ((code = op_show_finish_setup(i_ctx_p, penum, 2, NULL)) < 0) {

        ifree_object(values, "moveshow");

        penum->text.x_widths = penum->text.y_widths = NULL;

        return code;

    }

    pop(2);

    return op_show_continue(i_ctx_p);

}

static int

zxshow(i_ctx_t *i_ctx_p)

{

    return moveshow(i_ctx_p, true, false);

}

static int

zyshow(i_ctx_t *i_ctx_p)

{

    return moveshow(i_ctx_p, false, true);

}

static int

zxyshow(i_ctx_t *i_ctx_p)

{

    return moveshow(i_ctx_p, true, true);

}

/* ------ Initialization procedure ------ */

const op_def zcharx_op_defs[] =

{

    op_def_begin_level2(),

    {"1glyphshow", zglyphshow},

    {"2xshow", zxshow},

    {"2xyshow", zxyshow},

    {"2yshow", zyshow},

    op_def_end(0)

};