Logo Search packages:      
Sourcecode: cairo version File versions  Download package

cairo-surface-fallback.c

/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2002 University of Southern California
 * Copyright © 2005 Red Hat, Inc.
 *
 * 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 University of Southern
 * California.
 *
 * Contributor(s):
 *    Carl D. Worth <cworth@cworth.org>
 *      Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
 *    Chris Wilson <chris@chris-wilson.co.uk>
 */

#include "cairoint.h"

#include "cairo-boxes-private.h"
#include "cairo-clip-private.h"
#include "cairo-composite-rectangles-private.h"
#include "cairo-error-private.h"
#include "cairo-region-private.h"
#include "cairo-spans-private.h"
#include "cairo-surface-fallback-private.h"

00051 typedef struct {
    cairo_surface_t *dst;
    cairo_rectangle_int_t extents;
    cairo_image_surface_t *image;
    cairo_rectangle_int_t image_rect;
    void *image_extra;
} fallback_state_t;

/**
 * _fallback_init:
 *
 * Acquire destination image surface needed for an image-based
 * fallback.
 *
 * Return value: %CAIRO_INT_STATUS_NOTHING_TO_DO if the extents are not
 * visible, %CAIRO_STATUS_SUCCESS if some portion is visible and all
 * went well, or some error status otherwise.
 **/
static cairo_int_status_t
_fallback_init (fallback_state_t *state,
            cairo_surface_t  *dst,
            int               x,
            int               y,
            int               width,
            int               height)
{
    cairo_status_t status;

    state->extents.x = x;
    state->extents.y = y;
    state->extents.width = width;
    state->extents.height = height;

    state->dst = dst;

    status = _cairo_surface_acquire_dest_image (dst, &state->extents,
                                    &state->image, &state->image_rect,
                                    &state->image_extra);
    if (unlikely (status))
      return status;


    /* XXX: This NULL value tucked away in state->image is a rather
     * ugly interface. Cleaner would be to push the
     * CAIRO_INT_STATUS_NOTHING_TO_DO value down into
     * _cairo_surface_acquire_dest_image and its backend
     * counterparts. */
    assert (state->image != NULL);

    return CAIRO_STATUS_SUCCESS;
}

static void
_fallback_fini (fallback_state_t *state)
{
    _cairo_surface_release_dest_image (state->dst, &state->extents,
                               state->image, &state->image_rect,
                               state->image_extra);
}

typedef cairo_status_t
(*cairo_draw_func_t) (void                          *closure,
                  cairo_operator_t               op,
                  const cairo_pattern_t         *src,
                  cairo_surface_t               *dst,
                  int                            dst_x,
                  int                            dst_y,
                  const cairo_rectangle_int_t   *extents,
                  cairo_region_t              *clip_region);

static cairo_status_t
_create_composite_mask_pattern (cairo_surface_pattern_t       *mask_pattern,
                        cairo_clip_t                  *clip,
                        cairo_draw_func_t              draw_func,
                        void                          *draw_closure,
                        cairo_surface_t               *dst,
                        const cairo_rectangle_int_t   *extents)
{
    cairo_surface_t *mask;
    cairo_region_t *clip_region = NULL, *fallback_region = NULL;
    cairo_status_t status;
    cairo_bool_t clip_surface = FALSE;

    if (clip != NULL) {
      status = _cairo_clip_get_region (clip, &clip_region);
      if (unlikely (_cairo_status_is_error (status) ||
                  status == CAIRO_INT_STATUS_NOTHING_TO_DO))
      {
          return status;
      }

      clip_surface = status == CAIRO_INT_STATUS_UNSUPPORTED;
    }

    /* We need to use solid here, because to use CAIRO_OPERATOR_SOURCE with
     * a mask (as called via _cairo_surface_mask) triggers assertion failures.
     */
    mask = _cairo_surface_create_similar_solid (dst,
                                    CAIRO_CONTENT_ALPHA,
                                    extents->width,
                                    extents->height,
                                    CAIRO_COLOR_TRANSPARENT,
                                    TRUE);
    if (unlikely (mask->status))
      return mask->status;

    if (clip_region && (extents->x || extents->y)) {
      fallback_region = cairo_region_copy (clip_region);
      status = fallback_region->status;
      if (unlikely (status))
          goto CLEANUP_SURFACE;

      cairo_region_translate (fallback_region,
                        -extents->x,
                        -extents->y);
      clip_region = fallback_region;
    }

    status = draw_func (draw_closure, CAIRO_OPERATOR_ADD,
                  &_cairo_pattern_white.base, mask,
                  extents->x, extents->y,
                  extents,
                  clip_region);
    if (unlikely (status))
      goto CLEANUP_SURFACE;

    if (clip_surface)
      status = _cairo_clip_combine_with_surface (clip, mask, extents->x, extents->y);

    _cairo_pattern_init_for_surface (mask_pattern, mask);

 CLEANUP_SURFACE:
    if (fallback_region)
        cairo_region_destroy (fallback_region);
    cairo_surface_destroy (mask);

    return status;
}

/* Handles compositing with a clip surface when the operator allows
 * us to combine the clip with the mask
 */
static cairo_status_t
_clip_and_composite_with_mask (cairo_clip_t                  *clip,
                         cairo_operator_t               op,
                         const cairo_pattern_t         *src,
                         cairo_draw_func_t              draw_func,
                         void                          *draw_closure,
                         cairo_surface_t               *dst,
                         const cairo_rectangle_int_t   *extents)
{
    cairo_surface_pattern_t mask_pattern;
    cairo_status_t status;

    status = _create_composite_mask_pattern (&mask_pattern,
                                   clip,
                                   draw_func, draw_closure,
                                   dst, extents);
    if (likely (status == CAIRO_STATUS_SUCCESS)) {
      status = _cairo_surface_composite (op,
                                 src, &mask_pattern.base, dst,
                                 extents->x,     extents->y,
                                 0,              0,
                                 extents->x,     extents->y,
                                 extents->width, extents->height,
                                 NULL);

      _cairo_pattern_fini (&mask_pattern.base);
    }

    return status;
}

/* Handles compositing with a clip surface when we have to do the operation
 * in two pieces and combine them together.
 */
static cairo_status_t
_clip_and_composite_combine (cairo_clip_t                  *clip,
                       cairo_operator_t               op,
                       const cairo_pattern_t         *src,
                       cairo_draw_func_t              draw_func,
                       void                          *draw_closure,
                       cairo_surface_t               *dst,
                       const cairo_rectangle_int_t   *extents)
{
    cairo_surface_t *intermediate;
    cairo_surface_pattern_t pattern;
    cairo_surface_pattern_t clip_pattern;
    cairo_surface_t *clip_surface;
    int clip_x, clip_y;
    cairo_status_t status;

    /* We'd be better off here creating a surface identical in format
     * to dst, but we have no way of getting that information. Instead
     * we ask the backend to create a similar surface of identical content,
     * in the belief that the backend will do something useful - like use
     * an identical format. For example, the xlib backend will endeavor to
     * use a compatible depth to enable core protocol routines.
     */
    intermediate =
      _cairo_surface_create_similar_scratch (dst, dst->content,
                                     extents->width,
                                     extents->height);
    if (intermediate == NULL) {
      intermediate =
          _cairo_image_surface_create_with_content (dst->content,
                                          extents->width,
                                          extents->width);
    }
    if (unlikely (intermediate->status))
      return intermediate->status;

    /* Initialize the intermediate surface from the destination surface */
    _cairo_pattern_init_for_surface (&pattern, dst);
    status = _cairo_surface_composite (CAIRO_OPERATOR_SOURCE,
                               &pattern.base, NULL, intermediate,
                               extents->x,     extents->y,
                               0,              0,
                               0,              0,
                               extents->width, extents->height,
                               NULL);
    _cairo_pattern_fini (&pattern.base);
    if (unlikely (status))
      goto CLEANUP_SURFACE;

    status = (*draw_func) (draw_closure, op,
                     src, intermediate,
                     extents->x, extents->y,
                     extents,
                     NULL);
    if (unlikely (status))
      goto CLEANUP_SURFACE;

    assert (clip->path != NULL);
    clip_surface = _cairo_clip_get_surface (clip, dst, &clip_x, &clip_y);
    if (unlikely (clip_surface->status))
      goto CLEANUP_SURFACE;

    _cairo_pattern_init_for_surface (&clip_pattern, clip_surface);

    /* Combine that with the clip */
    status = _cairo_surface_composite (CAIRO_OPERATOR_DEST_IN,
                               &clip_pattern.base, NULL, intermediate,
                               extents->x - clip_x,
                               extents->y - clip_y,
                               0, 0,
                               0, 0,
                               extents->width, extents->height,
                               NULL);
    if (unlikely (status))
      goto CLEANUP_CLIP;

    /* Punch the clip out of the destination */
    status = _cairo_surface_composite (CAIRO_OPERATOR_DEST_OUT,
                               &clip_pattern.base, NULL, dst,
                               extents->x - clip_x,
                               extents->y - clip_y,
                               0, 0,
                               extents->x, extents->y,
                               extents->width, extents->height,
                               NULL);
    if (unlikely (status))
      goto CLEANUP_CLIP;

    /* Now add the two results together */
    _cairo_pattern_init_for_surface (&pattern, intermediate);
    status = _cairo_surface_composite (CAIRO_OPERATOR_ADD,
                               &pattern.base, NULL, dst,
                               0,              0,
                               0,              0,
                               extents->x,     extents->y,
                               extents->width, extents->height,
                               NULL);
    _cairo_pattern_fini (&pattern.base);

 CLEANUP_CLIP:
    _cairo_pattern_fini (&clip_pattern.base);
 CLEANUP_SURFACE:
    cairo_surface_destroy (intermediate);

    return status;
}

/* Handles compositing for %CAIRO_OPERATOR_SOURCE, which is special; it's
 * defined as (src IN mask IN clip) ADD (dst OUT (mask IN clip))
 */
static cairo_status_t
_clip_and_composite_source (cairo_clip_t                  *clip,
                      const cairo_pattern_t         *src,
                      cairo_draw_func_t              draw_func,
                      void                          *draw_closure,
                      cairo_surface_t               *dst,
                      const cairo_rectangle_int_t   *extents)
{
    cairo_surface_pattern_t mask_pattern;
    cairo_region_t *clip_region = NULL;
    cairo_status_t status;

    if (clip != NULL) {
      status = _cairo_clip_get_region (clip, &clip_region);
      if (unlikely (_cairo_status_is_error (status) ||
                  status == CAIRO_INT_STATUS_NOTHING_TO_DO))
      {
          return status;
      }
    }

    /* Create a surface that is mask IN clip */
    status = _create_composite_mask_pattern (&mask_pattern,
                                   clip,
                                   draw_func, draw_closure,
                                   dst, extents);
    if (unlikely (status))
      return status;

    /* Compute dest' = dest OUT (mask IN clip) */
    status = _cairo_surface_composite (CAIRO_OPERATOR_DEST_OUT,
                               &mask_pattern.base, NULL, dst,
                               0,              0,
                               0,              0,
                               extents->x,     extents->y,
                               extents->width, extents->height,
                               clip_region);

    if (unlikely (status))
      goto CLEANUP_MASK_PATTERN;

    /* Now compute (src IN (mask IN clip)) ADD dest' */
    status = _cairo_surface_composite (CAIRO_OPERATOR_ADD,
                               src, &mask_pattern.base, dst,
                               extents->x,     extents->y,
                               0,              0,
                               extents->x,     extents->y,
                               extents->width, extents->height,
                               clip_region);

 CLEANUP_MASK_PATTERN:
    _cairo_pattern_fini (&mask_pattern.base);
    return status;
}

static int
_cairo_rectangle_empty (const cairo_rectangle_int_t *rect)
{
    return rect->width == 0 || rect->height == 0;
}

/**
 * _clip_and_composite:
 * @clip: a #cairo_clip_t
 * @op: the operator to draw with
 * @src: source pattern
 * @draw_func: function that can be called to draw with the mask onto a surface.
 * @draw_closure: data to pass to @draw_func.
 * @dst: destination surface
 * @extents: rectangle holding a bounding box for the operation; this
 *           rectangle will be used as the size for the temporary
 *           surface.
 *
 * When there is a surface clip, we typically need to create an intermediate
 * surface. This function handles the logic of creating a temporary surface
 * drawing to it, then compositing the result onto the target surface.
 *
 * @draw_func is to called to draw the mask; it will be called no more
 * than once.
 *
 * Return value: %CAIRO_STATUS_SUCCESS if the drawing succeeded.
 **/
static cairo_status_t
_clip_and_composite (cairo_clip_t                  *clip,
                 cairo_operator_t               op,
                 const cairo_pattern_t         *src,
                 cairo_draw_func_t              draw_func,
                 void                          *draw_closure,
                 cairo_surface_t               *dst,
                 const cairo_rectangle_int_t   *extents)
{
    cairo_status_t status;

    if (_cairo_rectangle_empty (extents))
      /* Nothing to do */
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_CLEAR) {
      src = &_cairo_pattern_white.base;
      op = CAIRO_OPERATOR_DEST_OUT;
    }

    if (op == CAIRO_OPERATOR_SOURCE) {
      status = _clip_and_composite_source (clip,
                                   src,
                                   draw_func, draw_closure,
                                   dst, extents);
    } else {
      cairo_bool_t clip_surface = FALSE;
      cairo_region_t *clip_region = NULL;

      if (clip != NULL) {
          status = _cairo_clip_get_region (clip, &clip_region);
          if (unlikely (_cairo_status_is_error (status) ||
                    status == CAIRO_INT_STATUS_NOTHING_TO_DO))
          {
            return status;
          }

          clip_surface = status == CAIRO_INT_STATUS_UNSUPPORTED;
      }

      if (clip_surface) {
          if (_cairo_operator_bounded_by_mask (op)) {
            status = _clip_and_composite_with_mask (clip, op,
                                          src,
                                          draw_func, draw_closure,
                                          dst, extents);
          } else {
            status = _clip_and_composite_combine (clip, op,
                                          src,
                                          draw_func, draw_closure,
                                          dst, extents);
          }
      } else {
          status = draw_func (draw_closure, op,
                        src, dst,
                        0, 0,
                        extents,
                        clip_region);
      }
    }

    return status;
}

/* Composites a region representing a set of trapezoids.
 */
static cairo_status_t
_composite_trap_region (cairo_clip_t            *clip,
                  const cairo_pattern_t   *src,
                  cairo_operator_t         op,
                  cairo_surface_t         *dst,
                  cairo_region_t          *trap_region,
                  const cairo_rectangle_int_t   *extents)
{
    cairo_status_t status;
    cairo_surface_pattern_t mask_pattern;
    cairo_pattern_t *mask = NULL;
    int mask_x = 0, mask_y =0;

    if (clip != NULL) {
      cairo_surface_t *clip_surface = NULL;
      int clip_x, clip_y;

      clip_surface = _cairo_clip_get_surface (clip, dst, &clip_x, &clip_y);
      if (unlikely (clip_surface->status))
          return clip_surface->status;

      if (op == CAIRO_OPERATOR_CLEAR) {
          src = &_cairo_pattern_white.base;
          op = CAIRO_OPERATOR_DEST_OUT;
      }

      _cairo_pattern_init_for_surface (&mask_pattern, clip_surface);
      mask_x = extents->x - clip_x;
      mask_y = extents->y - clip_y;
      mask = &mask_pattern.base;
    }

    status = _cairo_surface_composite (op, src, mask, dst,
                               extents->x, extents->y,
                               mask_x, mask_y,
                               extents->x, extents->y,
                               extents->width, extents->height,
                               trap_region);

    if (mask != NULL)
      _cairo_pattern_fini (mask);

    return status;
}

00530 typedef struct {
    cairo_traps_t *traps;
    cairo_antialias_t antialias;
} cairo_composite_traps_info_t;

static cairo_status_t
_composite_traps_draw_func (void                          *closure,
                      cairo_operator_t               op,
                      const cairo_pattern_t         *src,
                      cairo_surface_t               *dst,
                      int                            dst_x,
                      int                            dst_y,
                      const cairo_rectangle_int_t   *extents,
                      cairo_region_t              *clip_region)
{
    cairo_composite_traps_info_t *info = closure;
    cairo_status_t status;
    cairo_region_t *extents_region = NULL;

    if (dst_x != 0 || dst_y != 0)
      _cairo_traps_translate (info->traps, - dst_x, - dst_y);

    if (clip_region == NULL &&
        !_cairo_operator_bounded_by_source (op)) {
        extents_region = cairo_region_create_rectangle (extents);
        if (unlikely (extents_region->status))
            return extents_region->status;
        cairo_region_translate (extents_region, -dst_x, -dst_y);
        clip_region = extents_region;
    }

    status = _cairo_surface_composite_trapezoids (op,
                                                  src, dst, info->antialias,
                                                  extents->x,         extents->y,
                                                  extents->x - dst_x, extents->y - dst_y,
                                                  extents->width,     extents->height,
                                                  info->traps->traps,
                                                  info->traps->num_traps,
                                                  clip_region);

    if (extents_region)
        cairo_region_destroy (extents_region);

    return status;
}

enum {
    HAS_CLEAR_REGION = 0x1,
};

static cairo_status_t
_clip_and_composite_region (const cairo_pattern_t *src,
                      cairo_operator_t op,
                      cairo_surface_t *dst,
                      cairo_region_t *trap_region,
                      cairo_clip_t *clip,
                      cairo_rectangle_int_t *extents)
{
    cairo_region_t clear_region;
    unsigned int has_region = 0;
    cairo_status_t status;

    if (! _cairo_operator_bounded_by_mask (op) && clip == NULL) {
      /* If we optimize drawing with an unbounded operator to
       * _cairo_surface_fill_rectangles() or to drawing with a
       * clip region, then we have an additional region to clear.
       */
      _cairo_region_init_rectangle (&clear_region, extents);
      status = cairo_region_subtract (&clear_region, trap_region);
      if (unlikely (status))
          return status;

      if (! cairo_region_is_empty (&clear_region))
          has_region |= HAS_CLEAR_REGION;
    }

    if ((src->type == CAIRO_PATTERN_TYPE_SOLID || op == CAIRO_OPERATOR_CLEAR) &&
      clip == NULL)
    {
      const cairo_color_t *color;

      if (op == CAIRO_OPERATOR_CLEAR)
          color = CAIRO_COLOR_TRANSPARENT;
      else
          color = &((cairo_solid_pattern_t *)src)->color;

      /* Solid rectangles special case */
      status = _cairo_surface_fill_region (dst, op, color, trap_region);
    } else {
      /* For a simple rectangle, we can just use composite(), for more
       * rectangles, we have to set a clip region. The cost of rasterizing
       * trapezoids is pretty high for most backends currently, so it's
       * worthwhile even if a region is needed.
       *
       * If we have a clip surface, we set it as the mask; this only works
       * for bounded operators other than SOURCE; for unbounded operators,
       * clip and mask cannot be interchanged. For SOURCE, the operator
       * as implemented by the backends is different in its handling
       * of the mask then what we want.
       *
       * CAIRO_INT_STATUS_UNSUPPORTED will be returned if the region has
       * more than rectangle and the destination doesn't support clip
       * regions. In that case, we fall through.
       */
      status = _composite_trap_region (clip, src, op, dst,
                               trap_region, extents);
    }

    if (has_region & HAS_CLEAR_REGION) {
      if (status == CAIRO_STATUS_SUCCESS) {
          status = _cairo_surface_fill_region (dst,
                                     CAIRO_OPERATOR_CLEAR,
                                     CAIRO_COLOR_TRANSPARENT,
                                     &clear_region);
      }
      _cairo_region_fini (&clear_region);
    }

    return status;
}

/* avoid using region code to re-validate boxes */
static cairo_status_t
_fill_rectangles (cairo_surface_t *dst,
              cairo_operator_t op,
              const cairo_pattern_t *src,
              cairo_traps_t *traps,
              cairo_clip_t *clip)
{
    const cairo_color_t *color;
    cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)];
    cairo_rectangle_int_t *rects = stack_rects;
    cairo_status_t status;
    int i;

    if (! traps->is_rectilinear || ! traps->maybe_region)
      return CAIRO_INT_STATUS_UNSUPPORTED;

    /* XXX: convert clip region to geometric boxes? */
    if (clip != NULL)
      return CAIRO_INT_STATUS_UNSUPPORTED;

    /* XXX: fallback for the region_subtract() operation */
    if (! _cairo_operator_bounded_by_mask (op))
      return CAIRO_INT_STATUS_UNSUPPORTED;

    if (! (src->type == CAIRO_PATTERN_TYPE_SOLID || op == CAIRO_OPERATOR_CLEAR))
      return CAIRO_INT_STATUS_UNSUPPORTED;

    if (traps->has_intersections) {
      if (traps->is_rectangular) {
          status = _cairo_bentley_ottmann_tessellate_rectangular_traps (traps, CAIRO_FILL_RULE_WINDING);
      } else {
          status = _cairo_bentley_ottmann_tessellate_rectilinear_traps (traps, CAIRO_FILL_RULE_WINDING);
      }
      if (unlikely (status))
          return status;
    }

    for (i = 0; i < traps->num_traps; i++) {
      if (! _cairo_fixed_is_integer (traps->traps[i].top)          ||
          ! _cairo_fixed_is_integer (traps->traps[i].bottom)       ||
          ! _cairo_fixed_is_integer (traps->traps[i].left.p1.x)    ||
          ! _cairo_fixed_is_integer (traps->traps[i].right.p1.x))
      {
          traps->maybe_region = FALSE;
          return CAIRO_INT_STATUS_UNSUPPORTED;
      }
    }

    if (traps->num_traps > ARRAY_LENGTH (stack_rects)) {
      rects = _cairo_malloc_ab (traps->num_traps,
                          sizeof (cairo_rectangle_int_t));
      if (unlikely (rects == NULL))
          return _cairo_error (CAIRO_STATUS_NO_MEMORY);
    }

    for (i = 0; i < traps->num_traps; i++) {
      int x1 = _cairo_fixed_integer_part (traps->traps[i].left.p1.x);
      int y1 = _cairo_fixed_integer_part (traps->traps[i].top);
      int x2 = _cairo_fixed_integer_part (traps->traps[i].right.p1.x);
      int y2 = _cairo_fixed_integer_part (traps->traps[i].bottom);

      rects[i].x = x1;
      rects[i].y = y1;
      rects[i].width = x2 - x1;
      rects[i].height = y2 - y1;
    }

    if (op == CAIRO_OPERATOR_CLEAR)
      color = CAIRO_COLOR_TRANSPARENT;
    else
      color = &((cairo_solid_pattern_t *)src)->color;

    status =  _cairo_surface_fill_rectangles (dst, op, color, rects, i);

    if (rects != stack_rects)
      free (rects);

    return status;
}

/* fast-path for very common composite of a single rectangle */
static cairo_status_t
_composite_rectangle (cairo_surface_t *dst,
                  cairo_operator_t op,
                  const cairo_pattern_t *src,
                  cairo_traps_t *traps,
                  cairo_clip_t *clip)
{
    cairo_rectangle_int_t rect;

    if (clip != NULL)
      return CAIRO_INT_STATUS_UNSUPPORTED;

    if (traps->num_traps > 1 || ! traps->is_rectilinear || ! traps->maybe_region)
      return CAIRO_INT_STATUS_UNSUPPORTED;

    if (! _cairo_fixed_is_integer (traps->traps[0].top)          ||
      ! _cairo_fixed_is_integer (traps->traps[0].bottom)       ||
      ! _cairo_fixed_is_integer (traps->traps[0].left.p1.x)    ||
      ! _cairo_fixed_is_integer (traps->traps[0].right.p1.x))
    {
      traps->maybe_region = FALSE;
      return CAIRO_INT_STATUS_UNSUPPORTED;
    }

    rect.x = _cairo_fixed_integer_part (traps->traps[0].left.p1.x);
    rect.y = _cairo_fixed_integer_part (traps->traps[0].top);
    rect.width  = _cairo_fixed_integer_part (traps->traps[0].right.p1.x) - rect.x;
    rect.height = _cairo_fixed_integer_part (traps->traps[0].bottom) - rect.y;

    return _cairo_surface_composite (op, src, NULL, dst,
                             rect.x, rect.y,
                             0, 0,
                             rect.x, rect.y,
                             rect.width, rect.height,
                             NULL);
}

/* Warning: This call modifies the coordinates of traps */
static cairo_status_t
_clip_and_composite_trapezoids (const cairo_pattern_t *src,
                        cairo_operator_t op,
                        cairo_surface_t *dst,
                        cairo_traps_t *traps,
                        cairo_antialias_t antialias,
                        cairo_clip_t *clip,
                        cairo_rectangle_int_t *extents)
{
    cairo_composite_traps_info_t traps_info;
    cairo_region_t *clip_region = NULL;
    cairo_bool_t clip_surface = FALSE;
    cairo_status_t status;

    if (traps->num_traps == 0 && _cairo_operator_bounded_by_mask (op))
      return CAIRO_STATUS_SUCCESS;

    if (clip != NULL) {
      status = _cairo_clip_get_region (clip, &clip_region);
      if (unlikely (_cairo_status_is_error (status)))
          return status;
      if (unlikely (status == CAIRO_INT_STATUS_NOTHING_TO_DO))
          return CAIRO_STATUS_SUCCESS;

      clip_surface = status == CAIRO_INT_STATUS_UNSUPPORTED;
    }

    /* Use a fast path if the trapezoids consist of a simple region,
     * but we can only do this if we do not have a clip surface, or can
     * substitute the mask with the clip.
     */
    if (! clip_surface ||
      (_cairo_operator_bounded_by_mask (op) && op != CAIRO_OPERATOR_SOURCE))
    {
      cairo_region_t *trap_region = NULL;

        if (_cairo_operator_bounded_by_source (op)) {
            status = _fill_rectangles (dst, op, src, traps, clip);
            if (status != CAIRO_INT_STATUS_UNSUPPORTED)
                return status;

            status = _composite_rectangle (dst, op, src, traps, clip);
            if (status != CAIRO_INT_STATUS_UNSUPPORTED)
                return status;
        }

      status = _cairo_traps_extract_region (traps, &trap_region);
      if (unlikely (_cairo_status_is_error (status)))
          return status;

      if (trap_region != NULL) {
          status = cairo_region_intersect_rectangle (trap_region, extents);
          if (unlikely (status)) {
            cairo_region_destroy (trap_region);
            return status;
          }

          if (clip_region != NULL) {
            status = cairo_region_intersect (trap_region, clip_region);
            if (unlikely (status)) {
                cairo_region_destroy (trap_region);
                return status;
            }
          }

          if (_cairo_operator_bounded_by_mask (op)) {
            cairo_rectangle_int_t trap_extents;

            cairo_region_get_extents (trap_region, &trap_extents);
            if (! _cairo_rectangle_intersect (extents, &trap_extents)) {
                cairo_region_destroy (trap_region);
                return CAIRO_STATUS_SUCCESS;
            }
          }

          status = _clip_and_composite_region (src, op, dst,
                                     trap_region,
                                     clip_surface ? clip : NULL,
                                     extents);
          cairo_region_destroy (trap_region);

          if (likely (status != CAIRO_INT_STATUS_UNSUPPORTED))
            return status;
      }
    }

    /* No fast path, exclude self-intersections and clip trapezoids. */
    if (traps->has_intersections) {
      if (traps->is_rectangular)
          status = _cairo_bentley_ottmann_tessellate_rectangular_traps (traps, CAIRO_FILL_RULE_WINDING);
      else if (traps->is_rectilinear)
          status = _cairo_bentley_ottmann_tessellate_rectilinear_traps (traps, CAIRO_FILL_RULE_WINDING);
      else
          status = _cairo_bentley_ottmann_tessellate_traps (traps, CAIRO_FILL_RULE_WINDING);
      if (unlikely (status))
          return status;
    }

    /* Otherwise render the trapezoids to a mask and composite in the usual
     * fashion.
     */
    traps_info.traps = traps;
    traps_info.antialias = antialias;

    return _clip_and_composite (clip, op, src,
                        _composite_traps_draw_func,
                        &traps_info, dst, extents);
}

cairo_status_t
_cairo_surface_fallback_paint (cairo_surface_t        *surface,
                         cairo_operator_t        op,
                         const cairo_pattern_t  *source,
                         cairo_clip_t           *clip)
{
    cairo_composite_rectangles_t extents;
    cairo_rectangle_int_t rect;
    cairo_clip_path_t *clip_path = clip ? clip->path : NULL;
    cairo_box_t boxes_stack[32], *clip_boxes = boxes_stack;
    cairo_boxes_t  boxes;
    int num_boxes = ARRAY_LENGTH (boxes_stack);
    cairo_status_t status;
    cairo_traps_t traps;

    if (!_cairo_surface_get_extents (surface, &rect))
        ASSERT_NOT_REACHED;

    status = _cairo_composite_rectangles_init_for_paint (&extents,
                                           rect.width,
                                           rect.height,
                                           op, source,
                                           clip);
    if (unlikely (status))
      return status;

    if (_cairo_clip_contains_extents (clip, &extents))
      clip = NULL;

    status = _cairo_clip_to_boxes (&clip, &extents, &clip_boxes, &num_boxes);
    if (unlikely (status))
      return status;

    /* If the clip cannot be reduced to a set of boxes, we will need to
     * use a clipmask. Paint is special as it is the only operation that
     * does not implicitly use a mask, so we may be able to reduce this
     * operation to a fill...
     */
    if (clip != NULL && clip_path->prev == NULL &&
      _cairo_operator_bounded_by_mask (op))
    {
      return _cairo_surface_fill (surface, op, source,
                            &clip_path->path,
                            clip_path->fill_rule,
                            clip_path->tolerance,
                            clip_path->antialias,
                            NULL);
    }

    /* meh, surface-fallback is dying anyway... */
    _cairo_boxes_init_for_array (&boxes, clip_boxes, num_boxes);
    status = _cairo_traps_init_boxes (&traps, &boxes);
    if (unlikely (status))
      goto CLEANUP_BOXES;

    status = _clip_and_composite_trapezoids (source, op, surface,
                                   &traps, CAIRO_ANTIALIAS_DEFAULT,
                                   clip,
                                             extents.is_bounded ? &extents.bounded : &extents.unbounded);
    _cairo_traps_fini (&traps);

CLEANUP_BOXES:
    if (clip_boxes != boxes_stack)
      free (clip_boxes);

    return status;
}

static cairo_status_t
_cairo_surface_mask_draw_func (void                        *closure,
                         cairo_operator_t             op,
                         const cairo_pattern_t       *src,
                         cairo_surface_t             *dst,
                         int                          dst_x,
                         int                          dst_y,
                         const cairo_rectangle_int_t *extents,
                         cairo_region_t            *clip_region)
{
    cairo_pattern_t *mask = closure;
    cairo_status_t status;
    cairo_region_t *extents_region = NULL;

    if (clip_region == NULL &&
        !_cairo_operator_bounded_by_source (op)) {
        extents_region = cairo_region_create_rectangle (extents);
        if (unlikely (extents_region->status))
            return extents_region->status;
        cairo_region_translate (extents_region, -dst_x, -dst_y);
        clip_region = extents_region;
    }

    if (src) {
      status = _cairo_surface_composite (op,
                                           src, mask, dst,
                                           extents->x,         extents->y,
                                           extents->x,         extents->y,
                                           extents->x - dst_x, extents->y - dst_y,
                                           extents->width,     extents->height,
                                           clip_region);
    } else {
      status = _cairo_surface_composite (op,
                                           mask, NULL, dst,
                                           extents->x,         extents->y,
                                           0,                  0, /* unused */
                                           extents->x - dst_x, extents->y - dst_y,
                                           extents->width,     extents->height,
                                           clip_region);
    }

    if (extents_region)
        cairo_region_destroy (extents_region);

    return status;
}

cairo_status_t
_cairo_surface_fallback_mask (cairo_surface_t         *surface,
                        cairo_operator_t         op,
                        const cairo_pattern_t   *source,
                        const cairo_pattern_t   *mask,
                        cairo_clip_t            *clip)
{
    cairo_composite_rectangles_t extents;
    cairo_rectangle_int_t rect;
    cairo_status_t status;

    if (!_cairo_surface_get_extents (surface, &rect))
        ASSERT_NOT_REACHED;

    status = _cairo_composite_rectangles_init_for_mask (&extents,
                                          rect.width, rect.height,
                                          op, source, mask, clip);
    if (unlikely (status))
      return status;

    if (_cairo_clip_contains_extents (clip, &extents))
      clip = NULL;

    if (clip != NULL && extents.is_bounded) {
      status = _cairo_clip_rectangle (clip, &extents.bounded);
      if (unlikely (status))
          return status;
    }

    return _clip_and_composite (clip, op, source,
                        _cairo_surface_mask_draw_func,
                        (void *) mask,
                        surface,
                                extents.is_bounded ? &extents.bounded : &extents.unbounded);
}

cairo_status_t
_cairo_surface_fallback_stroke (cairo_surface_t       *surface,
                        cairo_operator_t   op,
                        const cairo_pattern_t   *source,
                        cairo_path_fixed_t      *path,
                        const cairo_stroke_style_t    *stroke_style,
                        const cairo_matrix_t          *ctm,
                        const cairo_matrix_t          *ctm_inverse,
                        double                   tolerance,
                        cairo_antialias_t  antialias,
                        cairo_clip_t            *clip)
{
    cairo_polygon_t polygon;
    cairo_traps_t traps;
    cairo_box_t boxes_stack[32], *clip_boxes = boxes_stack;
    int num_boxes = ARRAY_LENGTH (boxes_stack);
    cairo_composite_rectangles_t extents;
    cairo_rectangle_int_t rect;
    cairo_status_t status;

    if (!_cairo_surface_get_extents (surface, &rect))
        ASSERT_NOT_REACHED;

    status = _cairo_composite_rectangles_init_for_stroke (&extents,
                                            rect.width,
                                            rect.height,
                                            op, source,
                                            path, stroke_style, ctm,
                                            clip);
    if (unlikely (status))
      return status;

    if (_cairo_clip_contains_extents (clip, &extents))
      clip = NULL;

    status = _cairo_clip_to_boxes (&clip, &extents, &clip_boxes, &num_boxes);
    if (unlikely (status))
      return status;

    _cairo_polygon_init (&polygon);
    _cairo_polygon_limit (&polygon, clip_boxes, num_boxes);

    _cairo_traps_init (&traps);
    _cairo_traps_limit (&traps, clip_boxes, num_boxes);

    if (path->is_rectilinear) {
      status = _cairo_path_fixed_stroke_rectilinear_to_traps (path,
                                                stroke_style,
                                                ctm,
                                                &traps);
      if (likely (status == CAIRO_STATUS_SUCCESS))
          goto DO_TRAPS;

      if (_cairo_status_is_error (status))
          goto CLEANUP;
    }

    status = _cairo_path_fixed_stroke_to_polygon (path,
                                      stroke_style,
                                      ctm, ctm_inverse,
                                      tolerance,
                                      &polygon);
    if (unlikely (status))
      goto CLEANUP;

    if (polygon.num_edges == 0)
      goto DO_TRAPS;

    if (_cairo_operator_bounded_by_mask (op)) {
      _cairo_box_round_to_rectangle (&polygon.extents, &extents.mask);
      if (! _cairo_rectangle_intersect (&extents.bounded, &extents.mask))
          goto CLEANUP;
    }

    /* Fall back to trapezoid fills. */
    status = _cairo_bentley_ottmann_tessellate_polygon (&traps,
                                          &polygon,
                                          CAIRO_FILL_RULE_WINDING);
    if (unlikely (status))
      goto CLEANUP;

  DO_TRAPS:
    status = _clip_and_composite_trapezoids (source, op, surface,
                                   &traps, antialias,
                                   clip,
                                             extents.is_bounded ? &extents.bounded : &extents.unbounded);
  CLEANUP:
    _cairo_traps_fini (&traps);
    _cairo_polygon_fini (&polygon);
    if (clip_boxes != boxes_stack)
      free (clip_boxes);

    return status;
}

cairo_status_t
_cairo_surface_fallback_fill (cairo_surface_t         *surface,
                        cairo_operator_t         op,
                        const cairo_pattern_t   *source,
                        cairo_path_fixed_t      *path,
                        cairo_fill_rule_t        fill_rule,
                        double                   tolerance,
                        cairo_antialias_t        antialias,
                        cairo_clip_t            *clip)
{
    cairo_polygon_t polygon;
    cairo_traps_t traps;
    cairo_box_t boxes_stack[32], *clip_boxes = boxes_stack;
    int num_boxes = ARRAY_LENGTH (boxes_stack);
    cairo_bool_t is_rectilinear;
    cairo_composite_rectangles_t extents;
    cairo_rectangle_int_t rect;
    cairo_status_t status;

    if (!_cairo_surface_get_extents (surface, &rect))
        ASSERT_NOT_REACHED;

    status = _cairo_composite_rectangles_init_for_fill (&extents,
                                          rect.width,
                                          rect.height,
                                          op, source, path,
                                          clip);
    if (unlikely (status))
      return status;

    if (_cairo_clip_contains_extents (clip, &extents))
      clip = NULL;

    status = _cairo_clip_to_boxes (&clip, &extents, &clip_boxes, &num_boxes);
    if (unlikely (status))
      return status;

    _cairo_traps_init (&traps);
    _cairo_traps_limit (&traps, clip_boxes, num_boxes);

    _cairo_polygon_init (&polygon);
    _cairo_polygon_limit (&polygon, clip_boxes, num_boxes);

    if (path->is_empty_fill)
      goto DO_TRAPS;

    is_rectilinear = _cairo_path_fixed_is_rectilinear_fill (path);
    if (is_rectilinear) {
      status = _cairo_path_fixed_fill_rectilinear_to_traps (path,
                                                fill_rule,
                                                &traps);
      if (likely (status == CAIRO_STATUS_SUCCESS))
          goto DO_TRAPS;

      if (_cairo_status_is_error (status))
          goto CLEANUP;
    }

    status = _cairo_path_fixed_fill_to_polygon (path, tolerance, &polygon);
    if (unlikely (status))
      goto CLEANUP;

    if (polygon.num_edges == 0)
      goto DO_TRAPS;

    if (_cairo_operator_bounded_by_mask (op)) {
      _cairo_box_round_to_rectangle (&polygon.extents, &extents.mask);
      if (! _cairo_rectangle_intersect (&extents.bounded, &extents.mask))
          goto CLEANUP;
    }

    if (is_rectilinear) {
      status = _cairo_bentley_ottmann_tessellate_rectilinear_polygon (&traps,
                                                      &polygon,
                                                      fill_rule);
      if (likely (status == CAIRO_STATUS_SUCCESS))
          goto DO_TRAPS;

      if (unlikely (_cairo_status_is_error (status)))
          goto CLEANUP;
    }

    /* Fall back to trapezoid fills. */
    status = _cairo_bentley_ottmann_tessellate_polygon (&traps,
                                          &polygon,
                                          fill_rule);
    if (unlikely (status))
      goto CLEANUP;

  DO_TRAPS:
    status = _clip_and_composite_trapezoids (source, op, surface,
                                   &traps, antialias,
                                   clip,
                                             extents.is_bounded ? &extents.bounded : &extents.unbounded);
  CLEANUP:
    _cairo_traps_fini (&traps);
    _cairo_polygon_fini (&polygon);
    if (clip_boxes != boxes_stack)
      free (clip_boxes);

    return status;
}

01229 typedef struct {
    cairo_scaled_font_t *font;
    cairo_glyph_t *glyphs;
    int num_glyphs;
} cairo_show_glyphs_info_t;

static cairo_status_t
_cairo_surface_old_show_glyphs_draw_func (void                          *closure,
                                cairo_operator_t               op,
                                const cairo_pattern_t         *src,
                                cairo_surface_t               *dst,
                                int                            dst_x,
                                int                            dst_y,
                                const cairo_rectangle_int_t *extents,
                                cairo_region_t        *clip_region)
{
    cairo_show_glyphs_info_t *glyph_info = closure;
    cairo_status_t status;
    cairo_region_t *extents_region = NULL;

    if (clip_region == NULL &&
        !_cairo_operator_bounded_by_source (op)) {
        extents_region = cairo_region_create_rectangle (extents);
        if (unlikely (extents_region->status))
            return extents_region->status;
        cairo_region_translate (extents_region, -dst_x, -dst_y);
        clip_region = extents_region;
    }

    /* Modifying the glyph array is fine because we know that this function
     * will be called only once, and we've already made a copy of the
     * glyphs in the wrapper.
     */
    if (dst_x != 0 || dst_y != 0) {
      int i;

      for (i = 0; i < glyph_info->num_glyphs; ++i) {
          ((cairo_glyph_t *) glyph_info->glyphs)[i].x -= dst_x;
          ((cairo_glyph_t *) glyph_info->glyphs)[i].y -= dst_y;
      }
    }

    status = _cairo_surface_old_show_glyphs (glyph_info->font, op, src,
                                   dst,
                                   extents->x, extents->y,
                                   extents->x - dst_x,
                                   extents->y - dst_y,
                                   extents->width,
                                   extents->height,
                                   glyph_info->glyphs,
                                   glyph_info->num_glyphs,
                                   clip_region);

    if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
      status = _cairo_scaled_font_show_glyphs (glyph_info->font,
                                                 op,
                                                 src, dst,
                                                 extents->x,         extents->y,
                                                 extents->x - dst_x,
                                                 extents->y - dst_y,
                                                 extents->width,     extents->height,
                                                 glyph_info->glyphs,
                                                 glyph_info->num_glyphs,
                                                 clip_region);
    }

    if (extents_region)
        cairo_region_destroy (extents_region);

    return status;
}

cairo_status_t
_cairo_surface_fallback_show_glyphs (cairo_surface_t        *surface,
                             cairo_operator_t          op,
                             const cairo_pattern_t    *source,
                             cairo_glyph_t            *glyphs,
                             int                 num_glyphs,
                             cairo_scaled_font_t      *scaled_font,
                             cairo_clip_t       *clip)
{
    cairo_show_glyphs_info_t glyph_info;
    cairo_composite_rectangles_t extents;
    cairo_rectangle_int_t rect;
    cairo_status_t status;

    if (!_cairo_surface_get_extents (surface, &rect))
        ASSERT_NOT_REACHED;

    status = _cairo_composite_rectangles_init_for_glyphs (&extents,
                                            rect.width,
                                            rect.height,
                                            op, source,
                                            scaled_font,
                                            glyphs, num_glyphs,
                                            clip,
                                            NULL);
    if (unlikely (status))
      return status;

    if (_cairo_clip_contains_rectangle (clip, &extents.mask))
      clip = NULL;

    if (clip != NULL && extents.is_bounded) {
      status = _cairo_clip_rectangle (clip, &extents.bounded);
      if (unlikely (status))
          return status;
    }

    glyph_info.font = scaled_font;
    glyph_info.glyphs = glyphs;
    glyph_info.num_glyphs = num_glyphs;

    return _clip_and_composite (clip, op, source,
                        _cairo_surface_old_show_glyphs_draw_func,
                        &glyph_info,
                        surface,
                                extents.is_bounded ? &extents.bounded : &extents.unbounded);
}

cairo_surface_t *
_cairo_surface_fallback_snapshot (cairo_surface_t *surface)
{
    cairo_surface_t *snapshot;
    cairo_status_t status;
    cairo_format_t format;
    cairo_surface_pattern_t pattern;
    cairo_image_surface_t *image;
    void *image_extra;

    status = _cairo_surface_acquire_source_image (surface,
                                      &image, &image_extra);
    if (unlikely (status))
      return _cairo_surface_create_in_error (status);

    format = image->format;
    if (format == CAIRO_FORMAT_INVALID) {
      /* Non-standard images formats can be generated when retrieving
       * images from unusual xservers, for example.
       */
      format = _cairo_format_from_content (image->base.content);
    }
    snapshot = cairo_image_surface_create (format,
                                 image->width,
                                 image->height);
    if (cairo_surface_status (snapshot)) {
      _cairo_surface_release_source_image (surface, image, image_extra);
      return snapshot;
    }

    _cairo_pattern_init_for_surface (&pattern, &image->base);
    status = _cairo_surface_paint (snapshot,
                           CAIRO_OPERATOR_SOURCE,
                           &pattern.base,
                           NULL);
    _cairo_pattern_fini (&pattern.base);
    _cairo_surface_release_source_image (surface, image, image_extra);
    if (unlikely (status)) {
      cairo_surface_destroy (snapshot);
      return _cairo_surface_create_in_error (status);
    }

    return snapshot;
}

cairo_status_t
_cairo_surface_fallback_composite (cairo_operator_t          op,
                           const cairo_pattern_t      *src,
                           const cairo_pattern_t      *mask,
                           cairo_surface_t            *dst,
                           int                         src_x,
                           int                         src_y,
                           int                         mask_x,
                           int                         mask_y,
                           int                         dst_x,
                           int                         dst_y,
                           unsigned int                width,
                           unsigned int                height,
                           cairo_region_t       *clip_region)
{
    fallback_state_t state;
    cairo_region_t *fallback_region = NULL;
    cairo_status_t status;

    status = _fallback_init (&state, dst, dst_x, dst_y, width, height);
    if (unlikely (status))
      return status;

    /* We know this will never fail with the image backend; but
     * instead of calling into it directly, we call
     * _cairo_surface_composite so that we get the correct device
     * offset handling.
     */

    if (clip_region != NULL && (state.image_rect.x || state.image_rect.y)) {
      fallback_region = cairo_region_copy (clip_region);
      status = fallback_region->status;
      if (unlikely (status))
          goto FAIL;

      cairo_region_translate (fallback_region,
                        -state.image_rect.x,
                        -state.image_rect.y);
      clip_region = fallback_region;
    }

    status = _cairo_surface_composite (op, src, mask,
                               &state.image->base,
                               src_x, src_y, mask_x, mask_y,
                               dst_x - state.image_rect.x,
                               dst_y - state.image_rect.y,
                               width, height,
                               clip_region);
  FAIL:
    if (fallback_region != NULL)
      cairo_region_destroy (fallback_region);
    _fallback_fini (&state);

    return status;
}

cairo_status_t
_cairo_surface_fallback_fill_rectangles (cairo_surface_t         *surface,
                               cairo_operator_t   op,
                               const cairo_color_t     *color,
                               cairo_rectangle_int_t   *rects,
                               int                num_rects)
{
    fallback_state_t state;
    cairo_rectangle_int_t *offset_rects = NULL;
    cairo_status_t status;
    int x1, y1, x2, y2;
    int i;

    assert (surface->snapshot_of == NULL);

    if (num_rects <= 0)
      return CAIRO_STATUS_SUCCESS;

    /* Compute the bounds of the rectangles, so that we know what area of the
     * destination surface to fetch
     */
    x1 = rects[0].x;
    y1 = rects[0].y;
    x2 = rects[0].x + rects[0].width;
    y2 = rects[0].y + rects[0].height;

    for (i = 1; i < num_rects; i++) {
      if (rects[i].x < x1)
          x1 = rects[i].x;
      if (rects[i].y < y1)
          y1 = rects[i].y;

      if ((int) (rects[i].x + rects[i].width) > x2)
          x2 = rects[i].x + rects[i].width;
      if ((int) (rects[i].y + rects[i].height) > y2)
          y2 = rects[i].y + rects[i].height;
    }

    status = _fallback_init (&state, surface, x1, y1, x2 - x1, y2 - y1);
    if (unlikely (status))
      return status;

    /* If the fetched image isn't at 0,0, we need to offset the rectangles */

    if (state.image_rect.x != 0 || state.image_rect.y != 0) {
      offset_rects = _cairo_malloc_ab (num_rects, sizeof (cairo_rectangle_int_t));
      if (unlikely (offset_rects == NULL)) {
          status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
          goto DONE;
      }

      for (i = 0; i < num_rects; i++) {
          offset_rects[i].x = rects[i].x - state.image_rect.x;
          offset_rects[i].y = rects[i].y - state.image_rect.y;
          offset_rects[i].width = rects[i].width;
          offset_rects[i].height = rects[i].height;
      }

      rects = offset_rects;
    }

    status = _cairo_surface_fill_rectangles (&state.image->base,
                                   op, color,
                                   rects, num_rects);

    free (offset_rects);

 DONE:
    _fallback_fini (&state);

    return status;
}

cairo_status_t
_cairo_surface_fallback_composite_trapezoids (cairo_operator_t          op,
                                    const cairo_pattern_t    *pattern,
                                    cairo_surface_t          *dst,
                                    cairo_antialias_t       antialias,
                                    int               src_x,
                                    int               src_y,
                                    int               dst_x,
                                    int               dst_y,
                                    unsigned int            width,
                                    unsigned int            height,
                                    cairo_trapezoid_t        *traps,
                                    int               num_traps,
                                    cairo_region_t          *clip_region)
{
    fallback_state_t state;
    cairo_region_t *fallback_region = NULL;
    cairo_trapezoid_t *offset_traps = NULL;
    cairo_status_t status;

    status = _fallback_init (&state, dst, dst_x, dst_y, width, height);
    if (unlikely (status))
      return status;

    /* If the destination image isn't at 0,0, we need to offset the trapezoids */

    if (state.image_rect.x != 0 || state.image_rect.y != 0) {
      offset_traps = _cairo_malloc_ab (num_traps, sizeof (cairo_trapezoid_t));
      if (offset_traps == NULL) {
          status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
          goto FAIL;
      }

      _cairo_trapezoid_array_translate_and_scale (offset_traps, traps, num_traps,
                                                    - state.image_rect.x, - state.image_rect.y,
                                                    1.0, 1.0);
      traps = offset_traps;

      /* similarly we need to adjust the region */
      if (clip_region != NULL) {
          fallback_region = cairo_region_copy (clip_region);
          status = fallback_region->status;
          if (unlikely (status))
            goto FAIL;

          cairo_region_translate (fallback_region,
                            -state.image_rect.x,
                            -state.image_rect.y);
          clip_region = fallback_region;
      }
    }

    status = _cairo_surface_composite_trapezoids (op, pattern,
                                        &state.image->base,
                                      antialias,
                                      src_x, src_y,
                                      dst_x - state.image_rect.x,
                                      dst_y - state.image_rect.y,
                                      width, height,
                                      traps, num_traps,
                                      clip_region);
 FAIL:
    if (offset_traps != NULL)
      free (offset_traps);

    if (fallback_region != NULL)
      cairo_region_destroy (fallback_region);

    _fallback_fini (&state);

    return status;
}

cairo_status_t
_cairo_surface_fallback_clone_similar (cairo_surface_t      *surface,
                               cairo_surface_t  *src,
                               int         src_x,
                               int         src_y,
                               int         width,
                               int         height,
                               int        *clone_offset_x,
                               int        *clone_offset_y,
                               cairo_surface_t **clone_out)
{
    cairo_surface_t *new_surface;
    cairo_surface_pattern_t pattern;
    cairo_status_t status;

    new_surface = _cairo_surface_create_similar_scratch (surface,
                                           src->content,
                                           width, height);
    if (new_surface == NULL)
      return CAIRO_INT_STATUS_UNSUPPORTED;
    if (unlikely (new_surface->status))
      return new_surface->status;

    /* We have to copy these here, so that the coordinate spaces are correct */
    new_surface->device_transform = src->device_transform;
    new_surface->device_transform_inverse = src->device_transform_inverse;

    _cairo_pattern_init_for_surface (&pattern, src);
    cairo_matrix_init_translate (&pattern.base.matrix, src_x, src_y);
    pattern.base.filter = CAIRO_FILTER_NEAREST;

    status = _cairo_surface_paint (new_surface,
                           CAIRO_OPERATOR_SOURCE,
                           &pattern.base,
                           NULL);
    _cairo_pattern_fini (&pattern.base);

    if (unlikely (status)) {
      cairo_surface_destroy (new_surface);
      return status;
    }

    *clone_offset_x = src_x;
    *clone_offset_y = src_y;
    *clone_out = new_surface;
    return CAIRO_STATUS_SUCCESS;
}

Generated by  Doxygen 1.6.0   Back to index