/* Copyright (C) 2001-2025 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.

*/

/* Implementation of (path-based) clipping */

#include "gx.h"

#include "gxdevice.h"

#include "gxclip.h"

#include "gxpath.h"

#include "gxcpath.h"

#include "gzcpath.h"

#include "gsutil.h"  /* For gs_next_ids */

/* Define whether to look for vertical clipping regions. */

#define CHECK_VERTICAL_CLIPPING

/* ------ Rectangle list clipper ------ */

/* Device for clipping with a region. */

/* We forward non-drawing operations, but we must be sure to intercept */

/* all drawing operations. */

static dev_proc_open_device(clip_open);

static dev_proc_fill_rectangle(clip_fill_rectangle);

static dev_proc_fill_rectangle_hl_color(clip_fill_rectangle_hl_color);

static dev_proc_copy_mono(clip_copy_mono);

static dev_proc_copy_planes(clip_copy_planes);

static dev_proc_copy_color(clip_copy_color);

static dev_proc_copy_alpha(clip_copy_alpha);

static dev_proc_copy_alpha_hl_color(clip_copy_alpha_hl_color);

static dev_proc_fill_mask(clip_fill_mask);

static dev_proc_strip_tile_rectangle(clip_strip_tile_rectangle);

static dev_proc_strip_tile_rect_devn(clip_strip_tile_rect_devn);

static dev_proc_strip_copy_rop2(clip_strip_copy_rop2);

static dev_proc_get_clipping_box(clip_get_clipping_box);

static dev_proc_get_bits_rectangle(clip_get_bits_rectangle);

static dev_proc_fill_path(clip_fill_path);

static dev_proc_transform_pixel_region(clip_transform_pixel_region);

static dev_proc_fill_stroke_path(clip_fill_stroke_path);

/* The device descriptor. */

static void

clipper_initialize_device_procs(gx_device *dev)

{

    set_dev_proc(dev, open_device, clip_open);

    set_dev_proc(dev, get_initial_matrix, gx_forward_get_initial_matrix);

    set_dev_proc(dev, map_rgb_color, gx_forward_map_rgb_color);

    set_dev_proc(dev, map_color_rgb, gx_forward_map_color_rgb);

    set_dev_proc(dev, fill_rectangle, clip_fill_rectangle);

    set_dev_proc(dev, copy_mono, clip_copy_mono);

    set_dev_proc(dev, copy_color, clip_copy_color);

    set_dev_proc(dev, get_params, gx_forward_get_params);

    set_dev_proc(dev, put_params, gx_forward_put_params);

    set_dev_proc(dev, map_cmyk_color, gx_forward_map_cmyk_color);

    set_dev_proc(dev, get_page_device, gx_forward_get_page_device);

    set_dev_proc(dev, get_alpha_bits, gx_forward_get_alpha_bits);

    set_dev_proc(dev, copy_alpha, clip_copy_alpha);

    set_dev_proc(dev, fill_path, clip_fill_path);

    set_dev_proc(dev, fill_mask, clip_fill_mask);

    set_dev_proc(dev, strip_tile_rectangle, clip_strip_tile_rectangle);

    set_dev_proc(dev, get_clipping_box, clip_get_clipping_box);

    set_dev_proc(dev, get_bits_rectangle, clip_get_bits_rectangle);

    set_dev_proc(dev, composite, gx_forward_composite);

    set_dev_proc(dev, get_hardware_params, gx_forward_get_hardware_params);

    set_dev_proc(dev, get_color_mapping_procs, gx_forward_get_color_mapping_procs);

    set_dev_proc(dev, get_color_comp_index, gx_forward_get_color_comp_index);

    set_dev_proc(dev, encode_color, gx_forward_encode_color);

    set_dev_proc(dev, decode_color, gx_forward_decode_color);

    set_dev_proc(dev, fill_rectangle_hl_color, clip_fill_rectangle_hl_color);

    set_dev_proc(dev, include_color_space, gx_forward_include_color_space);

    set_dev_proc(dev, update_spot_equivalent_colors, gx_forward_update_spot_equivalent_colors);

    set_dev_proc(dev, ret_devn_params, gx_forward_ret_devn_params);

    set_dev_proc(dev, fillpage, gx_forward_fillpage);

    set_dev_proc(dev, dev_spec_op, gx_forward_dev_spec_op);

    set_dev_proc(dev, copy_planes, clip_copy_planes);

    set_dev_proc(dev, get_profile, gx_forward_get_profile);

    set_dev_proc(dev, set_graphics_type_tag, gx_forward_set_graphics_type_tag);

    set_dev_proc(dev, strip_copy_rop2, clip_strip_copy_rop2);

    set_dev_proc(dev, strip_tile_rect_devn, clip_strip_tile_rect_devn);

    set_dev_proc(dev, copy_alpha_hl_color, clip_copy_alpha_hl_color);

    set_dev_proc(dev, transform_pixel_region, clip_transform_pixel_region);

    set_dev_proc(dev, fill_stroke_path, clip_fill_stroke_path);

    /* Ideally the following defaults would be filled in for us, but that

     * doesn't work at the moment. */

    set_dev_proc(dev, sync_output, gx_default_sync_output);

    set_dev_proc(dev, output_page, gx_default_output_page);

    set_dev_proc(dev, close_device, gx_default_close_device);

    set_dev_proc(dev, draw_thin_line, gx_default_draw_thin_line);

    set_dev_proc(dev, stroke_path, gx_default_stroke_path);

    set_dev_proc(dev, fill_trapezoid, gx_default_fill_trapezoid);

    set_dev_proc(dev, fill_parallelogram, gx_default_fill_parallelogram);

    set_dev_proc(dev, fill_triangle, gx_default_fill_triangle);

    set_dev_proc(dev, draw_thin_line, gx_default_draw_thin_line);

    set_dev_proc(dev, begin_typed_image, gx_default_begin_typed_image);

    set_dev_proc(dev, text_begin, gx_default_text_begin);

    set_dev_proc(dev, fill_linear_color_scanline, gx_default_fill_linear_color_scanline);

    set_dev_proc(dev, fill_linear_color_trapezoid, gx_default_fill_linear_color_trapezoid);

    set_dev_proc(dev, fill_linear_color_triangle, gx_default_fill_linear_color_triangle);

}

void

gx_device_clip_finalize(const gs_memory_t *cmem, void *vpdev)

{

    gx_device_clip *dev = (gx_device_clip *)vpdev;

    if (dev->target != NULL) {

        rc_decrement(dev->target, "gx_device_clip_finalize");

        dev->target = NULL;

    }

    if (dev->rect_list != NULL) {

        rc_decrement(dev->rect_list, "finalizing clipper device");

        dev->rect_list = NULL;

    }

}

static const gx_device_clip gs_clip_device =

{std_device_std_body(gx_device_clip,

                     clipper_initialize_device_procs, "clipper",

                     0, 0, 1, 1)

};

/* Make a clipping device. */

void

gx_make_clip_device_on_stack(gx_device_clip * dev, const gx_clip_path *pcpath, gx_device *target)

{

    gx_device_init_on_stack((gx_device *)dev, (const gx_device *)&gs_clip_device, target->memory);

    dev->cpath = pcpath;

    dev->list = *gx_cpath_list(pcpath);

    /* NOTE we do not count up the rect list even though we've taken a reference to it.

     * this is because we would then need to count it down in gx_destroy_clip_device_on_stack

     * and I have found at least one place where we do not call that function (!)

     * We should be safe though, the clip rectangle list should not disappear before we

     * exit the calling function at which point this device will disappear too.

     */

    dev->translation.x = 0;

    dev->translation.y = 0;

    dev->HWResolution[0] = target->HWResolution[0];

    dev->HWResolution[1] = target->HWResolution[1];

    dev->sgr = target->sgr;

    gx_device_set_target((gx_device_forward *)dev, target);

    dev->pad = target->pad;

    dev->log2_align_mod = target->log2_align_mod;

    dev->num_planar_planes = target->num_planar_planes;

    dev->graphics_type_tag = target->graphics_type_tag; /* initialize to same as target */

    dev->non_strict_bounds = target->non_strict_bounds;

    /* There is no finalization for device on stack so no rc increment */

    (*dev_proc(dev, open_device)) ((gx_device *)dev);

}

void

gx_destroy_clip_device_on_stack(gx_device_clip * dev)

{

    if (dev->target != NULL)

        rc_decrement(dev->target, "gx_destroy_clip_device_on_stack");

    if (dev->cpath)

        ((gx_clip_path *)dev->cpath)->cached = (dev->current == &dev->list.single ? NULL : dev->current); /* Cast away const */

}

gx_device *

gx_make_clip_device_on_stack_if_needed(gx_device_clip * dev, const gx_clip_path *pcpath, gx_device *target, gs_fixed_rect *rect)

{

    /* Reduce area if possible */

    if (rect->p.x < pcpath->outer_box.p.x)

        rect->p.x = pcpath->outer_box.p.x;

    if (rect->q.x > pcpath->outer_box.q.x)

        rect->q.x = pcpath->outer_box.q.x;

    if (rect->p.y < pcpath->outer_box.p.y)

        rect->p.y = pcpath->outer_box.p.y;

    if (rect->q.y > pcpath->outer_box.q.y)

        rect->q.y = pcpath->outer_box.q.y;

    /* Check for area being trivially clipped away. */

    if (rect->p.x >= rect->q.x || rect->p.y >= rect->q.y)

        return NULL;

    if (pcpath->inner_box.p.x <= rect->p.x && pcpath->inner_box.p.y <= rect->p.y &&

        pcpath->inner_box.q.x >= rect->q.x && pcpath->inner_box.q.y >= rect->q.y)

    {

        /* Area is trivially included. No need for clip. */

        return target;

    }

    gx_device_init_on_stack((gx_device *)dev, (const gx_device *)&gs_clip_device, target->memory);

    dev->list = *gx_cpath_list(pcpath);

    dev->translation.x = 0;

    dev->translation.y = 0;

    dev->HWResolution[0] = target->HWResolution[0];

    dev->HWResolution[1] = target->HWResolution[1];

    dev->sgr = target->sgr;

    gx_device_set_target((gx_device_forward *)dev, target);

    dev->pad = target->pad;

    dev->log2_align_mod = target->log2_align_mod;

    dev->num_planar_planes = target->num_planar_planes;

    dev->graphics_type_tag = target->graphics_type_tag; /* initialize to same as target */

    dev->non_strict_bounds = target->non_strict_bounds;

    /* There is no finalization for device on stack so no rc increment */

    (*dev_proc(dev, open_device)) ((gx_device *)dev);

    return (gx_device *)dev;

}

void

gx_make_clip_device_in_heap(gx_device_clip *dev,

                      const gx_clip_path   *pcpath,

                            gx_device      *target,

                            gs_memory_t    *mem)

{

    /* Can never fail */

    (void)gx_device_init((gx_device *)dev,

                         (const gx_device *)&gs_clip_device, mem, true);

    dev->list = *gx_cpath_list(pcpath);

    dev->rect_list = pcpath->rect_list;

    /* Bug #706771 we must make sure that the clip rectangle list does not

     * vanish while we still have a pointer to it. Do that by increasing the

     * reference count (obviously). We will decrement it in the device's finalize

     * routine.

     */

    rc_increment(dev->rect_list);

    dev->translation.x = 0;

    dev->translation.y = 0;

    dev->HWResolution[0] = target->HWResolution[0];

    dev->HWResolution[1] = target->HWResolution[1];

    dev->sgr = target->sgr;

    dev->pad = target->pad;

    dev->log2_align_mod = target->log2_align_mod;

    dev->num_planar_planes = target->num_planar_planes;

    dev->non_strict_bounds = target->non_strict_bounds;

    gx_device_set_target((gx_device_forward *)dev, target);

    gx_device_retain((gx_device *)dev, true); /* will free explicitly */

    /* Can never fail */

    (void)(*dev_proc(dev, open_device)) ((gx_device *)dev);

}

/* Define debugging statistics for the clipping loops. */

/* #define COLLECT_STATS_CLIP */

#ifdef COLLECT_STATS_CLIP

struct stats_clip_s {

    long

         loops, out, in_y, in, in1, down, up, x, no_x;

} stats_clip;

static const uint clip_interval = 10000;

# define INCR(v) (++(stats_clip.v))

# define INCR_THEN(v, e) (INCR(v), (e))

#else

# define INCR(v) DO_NOTHING

# define INCR_THEN(v, e) (e)

#endif

/*

 * Enumerate the rectangles of the x,w,y,h argument that fall within

 * the clipping region.

 * NB: if the clip list is transposed, then x, y, xe, and ye are already

 *     transposed and will need to be switched for the call to "process"

 */

static int

clip_enumerate_rest(gx_device_clip * rdev,

                    int x, int y, int xe, int ye,

                    int (*process)(clip_callback_data_t * pccd,

                                   int xc, int yc, int xec, int yec),

                    clip_callback_data_t * pccd)

{

    gx_clip_rect *rptr = rdev->current;   /* const within algorithm */

    int yc;

    int code;

#ifdef COLLECT_STATS_CLIP

    if (INCR(loops) % clip_interval == 0 && gs_debug_c('q')) {

        dmprintf5(rdev->memory,

                  "[q]loops=%ld out=%ld in_y=%ld in=%ld in1=%ld\n",

                  stats_clip.loops, stats_clip.out, stats_clip.in,

                  stats_clip.in_y, stats_clip.in1);

        dmprintf4(rdev->memory,

                  "[q]   down=%ld up=%ld x=%ld no_x=%ld\n",

                  stats_clip.down, stats_clip.up, stats_clip.x,

                  stats_clip.no_x);

    }

#endif

    /*

     * Warp the cursor forward or backward to the first rectangle row

     * that could include a given y value.  Assumes rptr is set, and

     * updates it.  Specifically, after this loop, either rptr == 0 (if

     * the y value is greater than all y values in the list), or y <

     * rptr->ymax and either rptr->prev == 0 or y >= rptr->prev->ymax.

     * Note that y <= rptr->ymin is possible.

     *

     * In the first case below, the while loop is safe because if there

     * is more than one rectangle, there is a 'stopper' at the end of

     * the list.

     */

    if (y >= rptr->ymax) {

        /* Bug 706875: The 'stopper' here is a rectangle from (max_int, max_int) to

         * (max_int, max_int). Hence it doesn't 'stop' cases when y == max_int.

         * These shouldn't really happen, but let's be sure. */

        if (y == max_int)

            return 0;

        if ((rptr = rptr->next) != 0)

            while (INCR_THEN(up, y >= rptr->ymax))

                rptr = rptr->next;

    } else

        while (rptr->prev != 0 && y < rptr->prev->ymax)

            INCR_THEN(down, rptr = rptr->prev);

    if (rptr == 0 || (yc = rptr->ymin) >= ye) {

        INCR(out);

        if (rdev->list.count > 1)

            rdev->current =

                (rptr != 0 ? rptr :

                 y >= rdev->current->ymax ? rdev->list.tail :

                 rdev->list.head);

        return 0;

    }

    rdev->current = rptr;

    if (yc < y)

        yc = y;

    do {

        const int ymax = rptr->ymax;

        int yec = min(ymax, ye);

        if_debug2m('Q', rdev->memory, "[Q]yc=%d yec=%d\n", yc, yec);

        do {

            int xc = rptr->xmin;

            int xec = rptr->xmax;

            if (xc < x)

                xc = x;

            if (xec > xe)

                xec = xe;

            if (xec > xc) {

                clip_rect_print('Q', "match", rptr);

                if_debug2m('Q', rdev->memory, "[Q]xc=%d xec=%d\n", xc, xec);

                INCR(x);

/*

 * Conditionally look ahead to detect unclipped vertical strips.  This is

 * really only valuable for 90 degree rotated images or (nearly-)vertical

 * lines with convex clipping regions; if we ever change images to use

 * source buffering and destination-oriented enumeration, we could probably

 * take out the code here with no adverse effects.

 */

#ifdef CHECK_VERTICAL_CLIPPING

                if (xec - xc == pccd->w) { /* full width */

                    /* Look ahead for a vertical swath. */

                    while ((rptr = rptr->next) != 0 &&

                           rptr->ymin == yec &&

                           rptr->ymax <= ye &&

                           rptr->xmin <= x &&

                           rptr->xmax >= xe

                           )

                        yec = rptr->ymax;

                } else

                    rptr = rptr->next;

#else

                rptr = rptr->next;

#endif

                if (rdev->list.transpose)

                    code = process(pccd, yc, xc, yec, xec);

                else

                    code = process(pccd, xc, yc, xec, yec);

                if (code < 0)

                    return code;

            } else {

                INCR_THEN(no_x, rptr = rptr->next);

            }

            if (rptr == 0)

                return 0;

        }

        while (rptr->ymax == ymax);

    } while ((yc = rptr->ymin) < ye);

    return 0;

}

static int

clip_enumerate(gx_device_clip * rdev, int x, int y, int w, int h,

               int (*process)(clip_callback_data_t * pccd,

                              int xc, int yc, int xec, int yec),

               clip_callback_data_t * pccd)

{

    int xe, ye;

    const gx_clip_rect *rptr = rdev->current;

    if (w <= 0 || h <= 0)

        return 0;

    pccd->tdev = rdev->target;

    x += rdev->translation.x;

    xe = x + w;

    y += rdev->translation.y;

    ye = y + h;

    /* pccd is non-transposed */

    pccd->x = x, pccd->y = y;

    pccd->w = w, pccd->h = h;

    /* transpose x, y, xe, ye for clip checking */

    if (rdev->list.transpose) {

        x = pccd->y;

        y = pccd->x;

        xe = x + h;

        ye = y + w;

    }

    /* Check for the region being entirely within the current rectangle. */

    if (y >= rptr->ymin && ye <= rptr->ymax &&

        x >= rptr->xmin && xe <= rptr->xmax

        ) {

        if (rdev->list.transpose) {

            return INCR_THEN(in, process(pccd, y, x, ye, xe));

        } else {

            return INCR_THEN(in, process(pccd, x, y, xe, ye));

        }

    }

    return clip_enumerate_rest(rdev, x, y, xe, ye, process, pccd);

}

/* Open a clipping device */

static int

clip_open(gx_device * dev)

{

    gx_device_clip *const rdev = (gx_device_clip *) dev;

    gx_device *tdev = rdev->target;

    /* Initialize the cursor. */

    rdev->current =

        (rdev->list.head == 0 ? &rdev->list.single : (rdev->cpath && rdev->cpath->cached ? rdev->cpath->cached : rdev->list.head));

    rdev->color_info = tdev->color_info;

    rdev->cached_colors = tdev->cached_colors;

    rdev->width = tdev->width;

    rdev->height = tdev->height;

    gx_device_copy_color_procs(dev, tdev);

    rdev->clipping_box_set = false;

    rdev->memory = tdev->memory;

    return 0;

}

/* Fill a rectangle */

int

clip_call_fill_rectangle(clip_callback_data_t * pccd, int xc, int yc, int xec, int yec)

{

    return (*dev_proc(pccd->tdev, fill_rectangle))

        (pccd->tdev, xc, yc, xec - xc, yec - yc, pccd->color[0]);

}

static int

clip_fill_rectangle_t0(gx_device * dev, int x, int y, int w, int h,

                       gx_color_index color)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    clip_callback_data_t ccdata;

    /* We handle the fastest cases in-line here. */

    gx_device *tdev = rdev->target;

    /*const*/ gx_clip_rect *rptr = rdev->current;

    int xe, ye;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    xe = x + w;

    y += rdev->translation.y;

    ye = y + h;

    /* ccdata is non-transposed */

    ccdata.x = x, ccdata.y = y;

    ccdata.w = w, ccdata.h = h;

    /* We open-code the most common cases here. */

    if ((y >= rptr->ymin && ye <= rptr->ymax) ||

        ((rptr = rptr->next) != 0 &&

         y >= rptr->ymin && ye <= rptr->ymax)

        ) {

        rdev->current = rptr; /* may be redundant, but awkward to avoid */

        INCR(in_y);

        if (x >= rptr->xmin && xe <= rptr->xmax) {

            INCR(in);

            return dev_proc(tdev, fill_rectangle)(tdev, x, y, w, h, color);

        }

        else if ((rptr->prev == 0 || rptr->prev->ymax != rptr->ymax) &&

                 (rptr->next == 0 || rptr->next->ymax != rptr->ymax)

                 ) {

            INCR(in1);

            if (x < rptr->xmin)

                x = rptr->xmin;

            if (xe > rptr->xmax)

                xe = rptr->xmax;

            if (x >= xe)

                 return 0;

            return dev_proc(tdev, fill_rectangle)(tdev, x, y, xe - x, h, color);

        }

    }

    ccdata.tdev = tdev;

    ccdata.color[0] = color;

    return clip_enumerate_rest(rdev, x, y, xe, ye, clip_call_fill_rectangle, &ccdata);

}

static int

clip_fill_rectangle_t1(gx_device * dev, int x, int y, int w, int h,

                       gx_color_index color)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    clip_callback_data_t ccdata;

    /* We handle the fastest cases in-line here. */

    gx_device *tdev = rdev->target;

    /*const*/ gx_clip_rect *rptr = rdev->current;

    int xe, ye;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    y += rdev->translation.y;

    /* ccdata is non-transposed */

    ccdata.x = x, ccdata.y = y;

    ccdata.w = w, ccdata.h = h;

    x = ccdata.y;

    y = ccdata.x;

    xe = x + h;

    ye = y + w;

    /* We open-code the most common cases here. */

    if ((y >= rptr->ymin && ye <= rptr->ymax) ||

        ((rptr = rptr->next) != 0 &&

         y >= rptr->ymin && ye <= rptr->ymax)

        ) {

        rdev->current = rptr; /* may be redundant, but awkward to avoid */

        INCR(in_y);

        if (x >= rptr->xmin && xe <= rptr->xmax) {

            INCR(in);

            return dev_proc(tdev, fill_rectangle)(tdev, y, x, w, h, color);

        }

        else if ((rptr->prev == 0 || rptr->prev->ymax != rptr->ymax) &&

                 (rptr->next == 0 || rptr->next->ymax != rptr->ymax)

                 ) {

            INCR(in1);

            if (x < rptr->xmin)

                x = rptr->xmin;

            if (xe > rptr->xmax)

                xe = rptr->xmax;

            if (x >= xe)

                 return 0;

            return dev_proc(tdev, fill_rectangle)(tdev, y, x, w, xe - x, color);

        }

    }

    ccdata.tdev = tdev;

    ccdata.color[0] = color;

    return clip_enumerate_rest(rdev, x, y, xe, ye, clip_call_fill_rectangle, &ccdata);

}

static int

clip_fill_rectangle_s0(gx_device * dev, int x, int y, int w, int h,

                       gx_color_index color)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    gx_device *tdev = rdev->target;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    w += x;

    y += rdev->translation.y;

    h += y;

    if (x < rdev->list.single.xmin)

        x = rdev->list.single.xmin;

    if (w > rdev->list.single.xmax)

        w = rdev->list.single.xmax;

    if (y < rdev->list.single.ymin)

        y = rdev->list.single.ymin;

    if (h > rdev->list.single.ymax)

        h = rdev->list.single.ymax;

    w -= x;

    h -= y;

    if (w <= 0 || h <= 0)

        return 0;

    return dev_proc(tdev, fill_rectangle)(tdev, x, y, w, h, color);

}

static int

clip_fill_rectangle_s1(gx_device * dev, int x, int y, int w, int h,

                       gx_color_index color)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    gx_device *tdev = rdev->target;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    w += x;

    y += rdev->translation.y;

    h += y;

    /* Now, treat x/w as y/h and vice versa as transposed. */

    if (x < rdev->list.single.ymin)

        x = rdev->list.single.ymin;

    if (w > rdev->list.single.ymax)

        w = rdev->list.single.ymax;

    if (y < rdev->list.single.xmin)

        y = rdev->list.single.xmin;

    if (h > rdev->list.single.xmax)

        h = rdev->list.single.xmax;

    w -= x;

    h -= y;

    if (w <= 0 || h <= 0)

        return 0;

    return dev_proc(tdev, fill_rectangle)(tdev, x, y, w, h, color);

}

static int

clip_fill_rectangle(gx_device * dev, int x, int y, int w, int h,

                    gx_color_index color)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    if (rdev->list.transpose) {

        if (rdev->list.count == 1)

            dev_proc(rdev, fill_rectangle) = clip_fill_rectangle_s1;

        else

            dev_proc(rdev, fill_rectangle) = clip_fill_rectangle_t1;

    } else {

        if (rdev->list.count == 1)

            dev_proc(rdev, fill_rectangle) = clip_fill_rectangle_s0;

        else

            dev_proc(rdev, fill_rectangle) = clip_fill_rectangle_t0;

    }

    return dev_proc(rdev, fill_rectangle)(dev, x, y, w, h, color);

}

int

clip_call_fill_rectangle_hl_color(clip_callback_data_t * pccd, int xc, int yc,

                                  int xec, int yec)

{

    gs_fixed_rect rect;

    rect.p.x = int2fixed(xc);

    rect.p.y = int2fixed(yc);

    rect.q.x = int2fixed(xec);

    rect.q.y = int2fixed(yec);

    return (*dev_proc(pccd->tdev, fill_rectangle_hl_color))

        (pccd->tdev, &rect, pccd->pgs, pccd->pdcolor, pccd->pcpath);

}

static int

clip_fill_rectangle_hl_color_t0(gx_device *dev, const gs_fixed_rect *rect,

    const gs_gstate *pgs, const gx_drawing_color *pdcolor,

    const gx_clip_path *pcpath)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    clip_callback_data_t ccdata;

    gx_device *tdev = rdev->target;

    gx_clip_rect *rptr = rdev->current;

    int xe, ye;

    int w, h, x, y;

    gs_fixed_rect newrect;

    x = fixed2int(rect->p.x);

    y = fixed2int(rect->p.y);

    w = fixed2int(rect->q.x) - x;

    h = fixed2int(rect->q.y) - y;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    xe = x + w;

    y += rdev->translation.y;

    ye = y + h;

    /* ccdata is non-transposed */

    ccdata.x = x, ccdata.y = y;

    ccdata.w = w, ccdata.h = h;

    /* We open-code the most common cases here. */

    if ((y >= rptr->ymin && ye <= rptr->ymax) ||

        ((rptr = rptr->next) != 0 &&

         y >= rptr->ymin && ye <= rptr->ymax)

        ) {

        rdev->current = rptr; /* may be redundant, but awkward to avoid */

        INCR(in_y);

        if (x >= rptr->xmin && xe <= rptr->xmax) {

            INCR(in);

            newrect.p.x = int2fixed(x);

            newrect.p.y = int2fixed(y);

            newrect.q.x = int2fixed(x + w);

            newrect.q.y = int2fixed(y + h);

            return dev_proc(tdev, fill_rectangle_hl_color)(tdev, &newrect, pgs,

                                                           pdcolor, pcpath);

        }

        else if ((rptr->prev == 0 || rptr->prev->ymax != rptr->ymax) &&

                 (rptr->next == 0 || rptr->next->ymax != rptr->ymax)

                 ) {

            INCR(in1);

            if (x < rptr->xmin)

                x = rptr->xmin;

            if (xe > rptr->xmax)

                xe = rptr->xmax;

            if (x >= xe)

                return 0;

            else {

                newrect.p.x = int2fixed(x);

                newrect.p.y = int2fixed(y);

                newrect.q.x = int2fixed(xe);

                newrect.q.y = int2fixed(y + h);

                return dev_proc(tdev, fill_rectangle_hl_color)(tdev, &newrect, pgs,

                                                               pdcolor, pcpath);

            }

        }

    }

    ccdata.tdev = tdev;

    ccdata.pdcolor = pdcolor;

    ccdata.pgs = pgs;

    ccdata.pcpath = pcpath;

    return clip_enumerate_rest(rdev, x, y, xe, ye,

                               clip_call_fill_rectangle_hl_color, &ccdata);

}

static int

clip_fill_rectangle_hl_color_t1(gx_device *dev, const gs_fixed_rect *rect,

    const gs_gstate *pgs, const gx_drawing_color *pdcolor,

    const gx_clip_path *pcpath)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    clip_callback_data_t ccdata;

    gx_device *tdev = rdev->target;

    gx_clip_rect *rptr = rdev->current;

    int xe, ye;

    int w, h, x, y;

    gs_fixed_rect newrect;

    x = fixed2int(rect->p.x);

    y = fixed2int(rect->p.y);

    w = fixed2int(rect->q.x) - x;

    h = fixed2int(rect->q.y) - y;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    y += rdev->translation.y;

    /* ccdata is non-transposed */

    ccdata.x = x, ccdata.y = y;

    ccdata.w = w, ccdata.h = h;

    /* transpose x, y, xe, ye for clip checking */

    x = ccdata.y;

    y = ccdata.x;

    xe = x + h;

    ye = y + w;

    /* We open-code the most common cases here. */

    if ((y >= rptr->ymin && ye <= rptr->ymax) ||

        ((rptr = rptr->next) != 0 &&

         y >= rptr->ymin && ye <= rptr->ymax)

        ) {

        rdev->current = rptr; /* may be redundant, but awkward to avoid */

        INCR(in_y);

        if (x >= rptr->xmin && xe <= rptr->xmax) {

            INCR(in);

            newrect.p.x = int2fixed(y);

            newrect.p.y = int2fixed(x);

            newrect.q.x = int2fixed(y + h);

            newrect.q.y = int2fixed(x + w);

            return dev_proc(tdev, fill_rectangle_hl_color)(tdev, &newrect, pgs,

                                                           pdcolor, pcpath);

        }

        else if ((rptr->prev == 0 || rptr->prev->ymax != rptr->ymax) &&

                 (rptr->next == 0 || rptr->next->ymax != rptr->ymax)

                 ) {

            INCR(in1);

            if (x < rptr->xmin)

                x = rptr->xmin;

            if (xe > rptr->xmax)

                xe = rptr->xmax;

            if (x >= xe)

                return 0;

            else {

                newrect.p.x = int2fixed(y);

                newrect.p.y = int2fixed(x);

                newrect.q.x = int2fixed(y+h);

                newrect.q.y = int2fixed(xe);

                return dev_proc(tdev, fill_rectangle_hl_color)(tdev, &newrect, pgs,

                                                               pdcolor, pcpath);

            }

        }

    }

    ccdata.tdev = tdev;

    ccdata.pdcolor = pdcolor;

    ccdata.pgs = pgs;

    ccdata.pcpath = pcpath;

    return clip_enumerate_rest(rdev, x, y, xe, ye,

                               clip_call_fill_rectangle_hl_color, &ccdata);

}

static int

clip_fill_rectangle_hl_color_s0(gx_device *dev, const gs_fixed_rect *rect,

    const gs_gstate *pgs, const gx_drawing_color *pdcolor,

    const gx_clip_path *pcpath)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    gx_device *tdev = rdev->target;

    int w, h, x, y;

    gs_fixed_rect newrect;

    x = fixed2int(rect->p.x);

    y = fixed2int(rect->p.y);

    w = fixed2int(rect->q.x) - x;

    h = fixed2int(rect->q.y) - y;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    w += x;

    y += rdev->translation.y;

    h += y;

    if (x < rdev->list.single.xmin)

        x = rdev->list.single.xmin;

    if (w > rdev->list.single.xmax)

        w = rdev->list.single.xmax;

    if (y < rdev->list.single.ymin)

        y = rdev->list.single.ymin;

    if (h > rdev->list.single.ymax)

        h = rdev->list.single.ymax;

    w -= x;

    h -= y;

    if (w <= 0 || h <= 0)

        return 0;

    newrect.p.x = int2fixed(x);

    newrect.p.y = int2fixed(y);

    newrect.q.x = int2fixed(x + w);

    newrect.q.y = int2fixed(y + h);

    return dev_proc(tdev, fill_rectangle_hl_color)(tdev, &newrect, pgs,

                                                   pdcolor, pcpath);

}

static int

clip_fill_rectangle_hl_color_s1(gx_device *dev, const gs_fixed_rect *rect,

    const gs_gstate *pgs, const gx_drawing_color *pdcolor,

    const gx_clip_path *pcpath)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    gx_device *tdev = rdev->target;

    int w, h, x, y;

    gs_fixed_rect newrect;

    x = fixed2int(rect->p.x);

    y = fixed2int(rect->p.y);

    w = fixed2int(rect->q.x) - x;

    h = fixed2int(rect->q.y) - y;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    w += x;

    y += rdev->translation.y;

    h += y;

    /* Now, treat x/w as y/h and vice versa as transposed. */

    if (x < rdev->list.single.ymin)

        x = rdev->list.single.ymin;

    if (w > rdev->list.single.ymax)

        w = rdev->list.single.ymax;

    if (y < rdev->list.single.xmin)

        y = rdev->list.single.xmin;

    if (h > rdev->list.single.xmax)

        h = rdev->list.single.xmax;

    w -= x;

    h -= y;

    if (w <= 0 || h <= 0)

        return 0;

    newrect.p.x = int2fixed(y);

    newrect.p.y = int2fixed(x);

    newrect.q.x = int2fixed(y + h);

    newrect.q.y = int2fixed(x + w);

    return dev_proc(tdev, fill_rectangle_hl_color)(tdev, &newrect, pgs,

                                                   pdcolor, pcpath);

}

static int

clip_fill_rectangle_hl_color(gx_device *dev, const gs_fixed_rect *rect,

    const gs_gstate *pgs, const gx_drawing_color *pdcolor,

    const gx_clip_path *pcpath)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    if (rdev->list.transpose) {

        if (rdev->list.count == 1)

            dev_proc(rdev, fill_rectangle_hl_color) = clip_fill_rectangle_hl_color_s1;

        else

            dev_proc(rdev, fill_rectangle_hl_color) = clip_fill_rectangle_hl_color_t1;

    } else {

        if (rdev->list.count == 1)

            dev_proc(rdev, fill_rectangle_hl_color) = clip_fill_rectangle_hl_color_s0;

        else

            dev_proc(rdev, fill_rectangle_hl_color) = clip_fill_rectangle_hl_color_t0;

    }

    return dev_proc(rdev, fill_rectangle_hl_color)(dev, rect, pgs, pdcolor, pcpath);

}

/* Copy a monochrome rectangle */

int

clip_call_copy_mono(clip_callback_data_t * pccd, int xc, int yc, int xec, int yec)

{

    return (*dev_proc(pccd->tdev, copy_mono))

        (pccd->tdev, pccd->data + (yc - pccd->y) * pccd->raster,

         pccd->sourcex + xc - pccd->x, pccd->raster, gx_no_bitmap_id,

         xc, yc, xec - xc, yec - yc, pccd->color[0], pccd->color[1]);

}

static int

clip_copy_mono_t0(gx_device * dev,

                  const byte * data, int sourcex, int raster, gx_bitmap_id id,

                  int x, int y, int w, int h,

                  gx_color_index color0, gx_color_index color1)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    clip_callback_data_t ccdata;

    /* We handle the fastest case in-line here. */

    gx_device *tdev = rdev->target;

    const gx_clip_rect *rptr = rdev->current;

    int xe, ye;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    xe = x + w;

    y += rdev->translation.y;

    ye = y + h;

    /* ccdata is non-transposed */

    ccdata.x = x, ccdata.y = y;

    ccdata.w = w, ccdata.h = h;

    if (y >= rptr->ymin && ye <= rptr->ymax) {

        INCR(in_y);

        if (x >= rptr->xmin && xe <= rptr->xmax) {

            INCR(in);

            return dev_proc(tdev, copy_mono)

                    (tdev, data, sourcex, raster, id, x, y, w, h, color0, color1);

        }

    }

    ccdata.tdev = tdev;

    ccdata.data = data, ccdata.sourcex = sourcex, ccdata.raster = raster;

    ccdata.color[0] = color0, ccdata.color[1] = color1;

    return clip_enumerate_rest(rdev, x, y, xe, ye,

                               clip_call_copy_mono, &ccdata);

}

static int

clip_copy_mono_t1(gx_device * dev,

                  const byte * data, int sourcex, int raster, gx_bitmap_id id,

                  int x, int y, int w, int h,

                  gx_color_index color0, gx_color_index color1)

{

    gx_device_clip *rdev = (gx_device_clip *) dev;

    clip_callback_data_t ccdata;

    /* We handle the fastest case in-line here. */

    gx_device *tdev = rdev->target;

    const gx_clip_rect *rptr = rdev->current;

    int xe, ye;

    if (w <= 0 || h <= 0)

        return 0;

    x += rdev->translation.x;

    y += rdev->translation.y;

    /* ccdata is non-transposed */

    ccdata.x = x, ccdata.y = y;

    ccdata.w = w, ccdata.h = h;

    x = ccdata.y;

    y = ccdata.x;

    xe = x + h;

    ye = y + w;

    if (y >= rptr->ymin && ye <= rptr->ymax) {

        INCR(in_y);

        if (x >= rptr->xmin && xe <= rptr->xmax) {

            INCR(in);

            /* Untranspose coords here. */

            return dev_proc(tdev, copy_mono)

                    (tdev, data, sourcex, raster, id, y, x, w, h, color0, color1);