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kolibrios/programs/develop/libraries/cairo/src/cairo-surface-fallback.c
Sergey Semyonov (Serge) 37b6abf576 cairo-1.10.2 
git-svn-id: svn://kolibrios.org@1892 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-02-28 06:05:46 +00:00

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/* -*- 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"
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;
}
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;
}
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;
}
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