Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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.
* Copyright © 2011 Intel Corporation
*
* 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
*
* 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-compositor-private.h"
#include "cairo-clip-inline.h"
#include "cairo-clip-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-paginated-private.h"
#include "cairo-pattern-inline.h"
#include "cairo-region-private.h"
#include "cairo-recording-surface-inline.h"
#include "cairo-spans-compositor-private.h"
#include "cairo-surface-subsurface-private.h"
#include "cairo-surface-snapshot-private.h"
#include "cairo-surface-observer-private.h"
typedef struct {
cairo_polygon_t *polygon;
cairo_fill_rule_t fill_rule;
cairo_antialias_t antialias;
} composite_spans_info_t;
static cairo_int_status_t
composite_polygon (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_fill_rule_t fill_rule,
cairo_antialias_t antialias);
static cairo_int_status_t
composite_boxes (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes);
static cairo_int_status_t
clip_and_composite_polygon (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_fill_rule_t fill_rule,
cairo_antialias_t antialias);
static cairo_surface_t *
get_clip_surface (const cairo_spans_compositor_t *compositor,
cairo_surface_t *dst,
const cairo_clip_t *clip,
const cairo_rectangle_int_t *extents)
{
cairo_composite_rectangles_t composite;
cairo_surface_t *surface;
cairo_box_t box;
cairo_polygon_t polygon;
const cairo_clip_path_t *clip_path;
cairo_antialias_t antialias;
cairo_fill_rule_t fill_rule;
cairo_int_status_t status;
assert (clip->path);
surface = _cairo_surface_create_scratch (dst,
CAIRO_CONTENT_ALPHA,
extents->width,
extents->height,
CAIRO_COLOR_TRANSPARENT);
_cairo_box_from_rectangle (&box, extents);
_cairo_polygon_init (&polygon, &box, 1);
clip_path = clip->path;
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&polygon);
if (unlikely (status))
goto cleanup_polygon;
polygon.num_limits = 0;
antialias = clip_path->antialias;
fill_rule = clip_path->fill_rule;
if (clip->boxes) {
cairo_polygon_t intersect;
cairo_boxes_t tmp;
_cairo_boxes_init_for_array (&tmp, clip->boxes, clip->num_boxes);
status= _cairo_polygon_init_boxes (&intersect, &tmp);
if (unlikely (status))
goto cleanup_polygon;
status = _cairo_polygon_intersect (&polygon, fill_rule,
&intersect, CAIRO_FILL_RULE_WINDING);
_cairo_polygon_fini (&intersect);
if (unlikely (status))
goto cleanup_polygon;
fill_rule = CAIRO_FILL_RULE_WINDING;
}
polygon.limits = NULL;
polygon.num_limits = 0;
clip_path = clip_path->prev;
while (clip_path) {
if (clip_path->antialias == antialias) {
cairo_polygon_t next;
_cairo_polygon_init (&next, NULL, 0);
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&next);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = _cairo_polygon_intersect (&polygon, fill_rule,
&next, clip_path->fill_rule);
_cairo_polygon_fini (&next);
if (unlikely (status))
goto cleanup_polygon;
fill_rule = CAIRO_FILL_RULE_WINDING;
}
clip_path = clip_path->prev;
}
_cairo_polygon_translate (&polygon, -extents->x, -extents->y);
status = _cairo_composite_rectangles_init_for_polygon (&composite, surface,
CAIRO_OPERATOR_ADD,
&_cairo_pattern_white.base,
&polygon,
NULL);
if (unlikely (status))
goto cleanup_polygon;
status = composite_polygon (compositor, &composite,
&polygon, fill_rule, antialias);
_cairo_composite_rectangles_fini (&composite);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
goto error;
_cairo_polygon_init (&polygon, &box, 1);
clip_path = clip->path;
antialias = clip_path->antialias == CAIRO_ANTIALIAS_DEFAULT ? CAIRO_ANTIALIAS_NONE : CAIRO_ANTIALIAS_DEFAULT;
clip_path = clip_path->prev;
while (clip_path) {
if (clip_path->antialias == antialias) {
if (polygon.num_edges == 0) {
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&polygon);
fill_rule = clip_path->fill_rule;
polygon.limits = NULL;
polygon.num_limits = 0;
} else {
cairo_polygon_t next;
_cairo_polygon_init (&next, NULL, 0);
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&next);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = _cairo_polygon_intersect (&polygon, fill_rule,
&next, clip_path->fill_rule);
_cairo_polygon_fini (&next);
fill_rule = CAIRO_FILL_RULE_WINDING;
}
if (unlikely (status))
goto error;
}
clip_path = clip_path->prev;
}
if (polygon.num_edges) {
_cairo_polygon_translate (&polygon, -extents->x, -extents->y);
status = _cairo_composite_rectangles_init_for_polygon (&composite, surface,
CAIRO_OPERATOR_IN,
&_cairo_pattern_white.base,
&polygon,
NULL);
if (unlikely (status))
goto cleanup_polygon;
status = composite_polygon (compositor, &composite,
&polygon, fill_rule, antialias);
_cairo_composite_rectangles_fini (&composite);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
goto error;
}
return surface;
cleanup_polygon:
_cairo_polygon_fini (&polygon);
error:
cairo_surface_destroy (surface);
return _cairo_int_surface_create_in_error (status);
}
static cairo_int_status_t
fixup_unbounded_mask (const cairo_spans_compositor_t *compositor,
const cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_composite_rectangles_t composite;
cairo_surface_t *clip;
cairo_int_status_t status;
TRACE((stderr, "%s\n", __FUNCTION__));
clip = get_clip_surface (compositor, extents->surface, extents->clip,
&extents->unbounded);
if (unlikely (clip->status)) {
if ((cairo_int_status_t)clip->status == CAIRO_INT_STATUS_NOTHING_TO_DO)
return CAIRO_STATUS_SUCCESS;
return clip->status;
}
status = _cairo_composite_rectangles_init_for_boxes (&composite,
extents->surface,
CAIRO_OPERATOR_CLEAR,
&_cairo_pattern_clear.base,
boxes,
NULL);
if (unlikely (status))
goto cleanup_clip;
_cairo_pattern_init_for_surface (&composite.mask_pattern.surface, clip);
composite.mask_pattern.base.filter = CAIRO_FILTER_NEAREST;
composite.mask_pattern.base.extend = CAIRO_EXTEND_NONE;
status = composite_boxes (compositor, &composite, boxes);
_cairo_pattern_fini (&composite.mask_pattern.base);
_cairo_composite_rectangles_fini (&composite);
cleanup_clip:
cairo_surface_destroy (clip);
return status;
}
static cairo_int_status_t
fixup_unbounded_polygon (const cairo_spans_compositor_t *compositor,
const cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_polygon_t polygon, intersect;
cairo_composite_rectangles_t composite;
cairo_fill_rule_t fill_rule;
cairo_antialias_t antialias;
cairo_int_status_t status;
TRACE((stderr, "%s\n", __FUNCTION__));
/* Can we treat the clip as a regular clear-polygon and use it to fill? */
status = _cairo_clip_get_polygon (extents->clip, &polygon,
&fill_rule, &antialias);
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
return status;
status= _cairo_polygon_init_boxes (&intersect, boxes);
if (unlikely (status))
goto cleanup_polygon;
status = _cairo_polygon_intersect (&polygon, fill_rule,
&intersect, CAIRO_FILL_RULE_WINDING);
_cairo_polygon_fini (&intersect);
if (unlikely (status))
goto cleanup_polygon;
status = _cairo_composite_rectangles_init_for_polygon (&composite,
extents->surface,
CAIRO_OPERATOR_CLEAR,
&_cairo_pattern_clear.base,
&polygon,
NULL);
if (unlikely (status))
goto cleanup_polygon;
status = composite_polygon (compositor, &composite,
&polygon, fill_rule, antialias);
_cairo_composite_rectangles_fini (&composite);
cleanup_polygon:
_cairo_polygon_fini (&polygon);
return status;
}
static cairo_int_status_t
fixup_unbounded_boxes (const cairo_spans_compositor_t *compositor,
const cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_boxes_t tmp, clear;
cairo_box_t box;
cairo_int_status_t status;
assert (boxes->is_pixel_aligned);
TRACE ((stderr, "%s\n", __FUNCTION__));
if (extents->bounded.width == extents->unbounded.width &&
extents->bounded.height == extents->unbounded.height)
{
return CAIRO_STATUS_SUCCESS;
}
/* subtract the drawn boxes from the unbounded area */
_cairo_boxes_init (&clear);
box.p1.x = _cairo_fixed_from_int (extents->unbounded.x + extents->unbounded.width);
box.p1.y = _cairo_fixed_from_int (extents->unbounded.y);
box.p2.x = _cairo_fixed_from_int (extents->unbounded.x);
box.p2.y = _cairo_fixed_from_int (extents->unbounded.y + extents->unbounded.height);
if (boxes->num_boxes) {
_cairo_boxes_init (&tmp);
status = _cairo_boxes_add (&tmp, CAIRO_ANTIALIAS_DEFAULT, &box);
assert (status == CAIRO_INT_STATUS_SUCCESS);
tmp.chunks.next = &boxes->chunks;
tmp.num_boxes += boxes->num_boxes;
status = _cairo_bentley_ottmann_tessellate_boxes (&tmp,
CAIRO_FILL_RULE_WINDING,
&clear);
tmp.chunks.next = NULL;
if (unlikely (status))
goto error;
} else {
box.p1.x = _cairo_fixed_from_int (extents->unbounded.x);
box.p2.x = _cairo_fixed_from_int (extents->unbounded.x + extents->unbounded.width);
status = _cairo_boxes_add (&clear, CAIRO_ANTIALIAS_DEFAULT, &box);
assert (status == CAIRO_INT_STATUS_SUCCESS);
}
/* If we have a clip polygon, we need to intersect with that as well */
if (extents->clip->path) {
status = fixup_unbounded_polygon (compositor, extents, &clear);
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
status = fixup_unbounded_mask (compositor, extents, &clear);
} else {
/* Otherwise just intersect with the clip boxes */
if (extents->clip->num_boxes) {
_cairo_boxes_init_for_array (&tmp,
extents->clip->boxes,
extents->clip->num_boxes);
status = _cairo_boxes_intersect (&clear, &tmp, &clear);
if (unlikely (status))
goto error;
}
if (clear.is_pixel_aligned) {
status = compositor->fill_boxes (extents->surface,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear);
} else {
cairo_composite_rectangles_t composite;
status = _cairo_composite_rectangles_init_for_boxes (&composite,
extents->surface,
CAIRO_OPERATOR_CLEAR,
&_cairo_pattern_clear.base,
&clear,
NULL);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
status = composite_boxes (compositor, &composite, &clear);
_cairo_composite_rectangles_fini (&composite);
}
}
}
error:
_cairo_boxes_fini (&clear);
return status;
}
static cairo_surface_t *
unwrap_source (const cairo_pattern_t *pattern)
{
cairo_rectangle_int_t limit;
return _cairo_pattern_get_source ((cairo_surface_pattern_t *)pattern,
&limit);
}
static cairo_bool_t
is_recording_pattern (const cairo_pattern_t *pattern)
{
cairo_surface_t *surface;
if (pattern->type != CAIRO_PATTERN_TYPE_SURFACE)
return FALSE;
surface = ((const cairo_surface_pattern_t *) pattern)->surface;
return _cairo_surface_is_recording (surface);
}
static cairo_bool_t
recording_pattern_contains_sample (const cairo_pattern_t *pattern,
const cairo_rectangle_int_t *sample)
{
cairo_recording_surface_t *surface;
if (! is_recording_pattern (pattern))
return FALSE;
if (pattern->extend == CAIRO_EXTEND_NONE)
return TRUE;
surface = (cairo_recording_surface_t *) unwrap_source (pattern);
if (surface->unbounded)
return TRUE;
return _cairo_rectangle_contains_rectangle (&surface->extents, sample);
}
static cairo_bool_t
op_reduces_to_source (const cairo_composite_rectangles_t *extents,
cairo_bool_t no_mask)
{
if (extents->op == CAIRO_OPERATOR_SOURCE)
return TRUE;
if (extents->surface->is_clear)
return extents->op == CAIRO_OPERATOR_OVER || extents->op == CAIRO_OPERATOR_ADD;
if (no_mask && extents->op == CAIRO_OPERATOR_OVER)
return _cairo_pattern_is_opaque (&extents->source_pattern.base,
&extents->source_sample_area);
return FALSE;
}
static cairo_status_t
upload_boxes (const cairo_spans_compositor_t *compositor,
const cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_surface_t *dst = extents->surface;
const cairo_surface_pattern_t *source = &extents->source_pattern.surface;
cairo_surface_t *src;
cairo_rectangle_int_t limit;
cairo_int_status_t status;
int tx, ty;
TRACE ((stderr, "%s\n", __FUNCTION__));
src = _cairo_pattern_get_source(source, &limit);
if (!(src->type == CAIRO_SURFACE_TYPE_IMAGE || src->type == dst->type))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! _cairo_matrix_is_integer_translation (&source->base.matrix, &tx, &ty))
return CAIRO_INT_STATUS_UNSUPPORTED;
/* Check that the data is entirely within the image */
if (extents->bounded.x + tx < limit.x || extents->bounded.y + ty < limit.y)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (extents->bounded.x + extents->bounded.width + tx > limit.x + limit.width ||
extents->bounded.y + extents->bounded.height + ty > limit.y + limit.height)
return CAIRO_INT_STATUS_UNSUPPORTED;
tx += limit.x;
ty += limit.y;
if (src->type == CAIRO_SURFACE_TYPE_IMAGE)
status = compositor->draw_image_boxes (dst,
(cairo_image_surface_t *)src,
boxes, tx, ty);
else
status = compositor->copy_boxes (dst, src, boxes, &extents->bounded,
tx, ty);
return status;
}
static cairo_bool_t
_clip_is_region (const cairo_clip_t *clip)
{
int i;
if (clip->is_region)
return TRUE;
if (clip->path)
return FALSE;
for (i = 0; i < clip->num_boxes; i++) {
const cairo_box_t *b = &clip->boxes[i];
if (!_cairo_fixed_is_integer (b->p1.x | b->p1.y | b->p2.x | b->p2.y))
return FALSE;
}
return TRUE;
}
static cairo_int_status_t
composite_aligned_boxes (const cairo_spans_compositor_t *compositor,
const cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_surface_t *dst = extents->surface;
cairo_operator_t op = extents->op;
const cairo_pattern_t *source = &extents->source_pattern.base;
cairo_int_status_t status;
cairo_bool_t need_clip_mask = ! _clip_is_region (extents->clip);
cairo_bool_t op_is_source;
cairo_bool_t no_mask;
cairo_bool_t inplace;
TRACE ((stderr, "%s: need_clip_mask=%d, is-bounded=%d\n",
__FUNCTION__, need_clip_mask, extents->is_bounded));
if (need_clip_mask && ! extents->is_bounded) {
TRACE ((stderr, "%s: unsupported clip\n", __FUNCTION__));
return CAIRO_INT_STATUS_UNSUPPORTED;
}
no_mask = extents->mask_pattern.base.type == CAIRO_PATTERN_TYPE_SOLID &&
CAIRO_COLOR_IS_OPAQUE (&extents->mask_pattern.solid.color);
op_is_source = op_reduces_to_source (extents, no_mask);
inplace = ! need_clip_mask && op_is_source && no_mask;
TRACE ((stderr, "%s: op-is-source=%d [op=%d], no-mask=%d, inplace=%d\n",
__FUNCTION__, op_is_source, op, no_mask, inplace));
if (op == CAIRO_OPERATOR_SOURCE && (need_clip_mask || ! no_mask)) {
/* SOURCE with a mask is actually a LERP in cairo semantics */
if ((compositor->flags & CAIRO_SPANS_COMPOSITOR_HAS_LERP) == 0) {
TRACE ((stderr, "%s: unsupported lerp\n", __FUNCTION__));
return CAIRO_INT_STATUS_UNSUPPORTED;
}
}
/* Are we just copying a recording surface? */
if (inplace &&
recording_pattern_contains_sample (&extents->source_pattern.base,
&extents->source_sample_area))
{
cairo_clip_t *recording_clip;
const cairo_pattern_t *source = &extents->source_pattern.base;
const cairo_matrix_t *m;
cairo_matrix_t matrix;
/* XXX could also do tiling repeat modes... */
/* first clear the area about to be overwritten */
if (! dst->is_clear) {
status = compositor->fill_boxes (dst,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
boxes);
if (unlikely (status))
return status;
dst->is_clear = TRUE;
}
m = &source->matrix;
if (_cairo_surface_has_device_transform (dst)) {
cairo_matrix_multiply (&matrix,
&source->matrix,
&dst->device_transform);
m = &matrix;
}
recording_clip = _cairo_clip_from_boxes (boxes);
status = _cairo_recording_surface_replay_with_clip (unwrap_source (source),
m, dst, recording_clip);
_cairo_clip_destroy (recording_clip);
return status;
}
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (! need_clip_mask && no_mask && source->type == CAIRO_PATTERN_TYPE_SOLID) {
const cairo_color_t *color;
color = &((cairo_solid_pattern_t *) source)->color;
if (op_is_source)
op = CAIRO_OPERATOR_SOURCE;
status = compositor->fill_boxes (dst, op, color, boxes);
} else if (inplace && source->type == CAIRO_PATTERN_TYPE_SURFACE) {
status = upload_boxes (compositor, extents, boxes);
}
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
cairo_surface_t *src;
cairo_surface_t *mask = NULL;
int src_x, src_y;
int mask_x = 0, mask_y = 0;
/* All typical cases will have been resolved before now... */
if (need_clip_mask) {
mask = get_clip_surface (compositor, dst, extents->clip,
&extents->bounded);
if (unlikely (mask->status))
return mask->status;
mask_x = -extents->bounded.x;
mask_y = -extents->bounded.y;
}
/* XXX but this is still ugly */
if (! no_mask) {
src = compositor->pattern_to_surface (dst,
&extents->mask_pattern.base,
TRUE,
&extents->bounded,
&extents->mask_sample_area,
&src_x, &src_y);
if (unlikely (src->status)) {
cairo_surface_destroy (mask);
return src->status;
}
if (mask != NULL) {
status = compositor->composite_boxes (mask, CAIRO_OPERATOR_IN,
src, NULL,
src_x, src_y,
0, 0,
mask_x, mask_y,
boxes, &extents->bounded);
cairo_surface_destroy (src);
} else {
mask = src;
mask_x = src_x;
mask_y = src_y;
}
}
src = compositor->pattern_to_surface (dst, source, FALSE,
&extents->bounded,
&extents->source_sample_area,
&src_x, &src_y);
if (likely (src->status == CAIRO_STATUS_SUCCESS)) {
status = compositor->composite_boxes (dst, op, src, mask,
src_x, src_y,
mask_x, mask_y,
0, 0,
boxes, &extents->bounded);
cairo_surface_destroy (src);
} else
status = src->status;
cairo_surface_destroy (mask);
}
if (status == CAIRO_INT_STATUS_SUCCESS && ! extents->is_bounded)
status = fixup_unbounded_boxes (compositor, extents, boxes);
return status;
}
static cairo_bool_t
composite_needs_clip (const cairo_composite_rectangles_t *composite,
const cairo_box_t *extents)
{
return !_cairo_clip_contains_box (composite->clip, extents);
}
static cairo_int_status_t
composite_boxes (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_abstract_span_renderer_t renderer;
cairo_rectangular_scan_converter_t converter;
const struct _cairo_boxes_chunk *chunk;
cairo_int_status_t status;
cairo_box_t box;
TRACE ((stderr, "%s\n", __FUNCTION__));
_cairo_box_from_rectangle (&box, &extents->unbounded);
if (composite_needs_clip (extents, &box)) {
TRACE ((stderr, "%s: unsupported clip\n", __FUNCTION__));
return CAIRO_INT_STATUS_UNSUPPORTED;
}
_cairo_rectangular_scan_converter_init (&converter, &extents->unbounded);
for (chunk = &boxes->chunks; chunk != NULL; chunk = chunk->next) {
const cairo_box_t *box = chunk->base;
int i;
for (i = 0; i < chunk->count; i++) {
status = _cairo_rectangular_scan_converter_add_box (&converter, &box[i], 1);
if (unlikely (status))
goto cleanup_converter;
}
}
status = compositor->renderer_init (&renderer, extents,
CAIRO_ANTIALIAS_DEFAULT, FALSE);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = converter.base.generate (&converter.base, &renderer.base);
compositor->renderer_fini (&renderer, status);
cleanup_converter:
converter.base.destroy (&converter.base);
return status;
}
static cairo_int_status_t
composite_polygon (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_fill_rule_t fill_rule,
cairo_antialias_t antialias)
{
cairo_abstract_span_renderer_t renderer;
cairo_scan_converter_t *converter;
cairo_bool_t needs_clip;
cairo_int_status_t status;
if (extents->is_bounded)
needs_clip = extents->clip->path != NULL;
else
needs_clip = !_clip_is_region (extents->clip) || extents->clip->num_boxes > 1;
TRACE ((stderr, "%s - needs_clip=%d\n", __FUNCTION__, needs_clip));
if (needs_clip) {
TRACE ((stderr, "%s: unsupported clip\n", __FUNCTION__));
return CAIRO_INT_STATUS_UNSUPPORTED;
converter = _cairo_clip_tor_scan_converter_create (extents->clip,
polygon,
fill_rule, antialias);
} else {
const cairo_rectangle_int_t *r = &extents->unbounded;
if (antialias == CAIRO_ANTIALIAS_FAST) {
converter = _cairo_tor22_scan_converter_create (r->x, r->y,
r->x + r->width,
r->y + r->height,
fill_rule, antialias);
status = _cairo_tor22_scan_converter_add_polygon (converter, polygon);
} else if (antialias == CAIRO_ANTIALIAS_NONE) {
converter = _cairo_mono_scan_converter_create (r->x, r->y,
r->x + r->width,
r->y + r->height,
fill_rule);
status = _cairo_mono_scan_converter_add_polygon (converter, polygon);
} else {
converter = _cairo_tor_scan_converter_create (r->x, r->y,
r->x + r->width,
r->y + r->height,
fill_rule, antialias);
status = _cairo_tor_scan_converter_add_polygon (converter, polygon);
}
}
if (unlikely (status))
goto cleanup_converter;
status = compositor->renderer_init (&renderer, extents,
antialias, needs_clip);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = converter->generate (converter, &renderer.base);
compositor->renderer_fini (&renderer, status);
cleanup_converter:
converter->destroy (converter);
return status;
}
static cairo_int_status_t
trim_extents_to_boxes (cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_box_t box;
_cairo_boxes_extents (boxes, &box);
return _cairo_composite_rectangles_intersect_mask_extents (extents, &box);
}
static cairo_int_status_t
trim_extents_to_polygon (cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon)
{
return _cairo_composite_rectangles_intersect_mask_extents (extents,
&polygon->extents);
}
static cairo_int_status_t
clip_and_composite_boxes (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_int_status_t status;
cairo_polygon_t polygon;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = trim_extents_to_boxes (extents, boxes);
if (unlikely (status))
return status;
if (boxes->num_boxes == 0) {
if (extents->is_bounded)
return CAIRO_STATUS_SUCCESS;
return fixup_unbounded_boxes (compositor, extents, boxes);
}
/* Can we reduce drawing through a clip-mask to simply drawing the clip? */
if (extents->clip->path != NULL && extents->is_bounded) {
cairo_polygon_t polygon;
cairo_fill_rule_t fill_rule;
cairo_antialias_t antialias;
cairo_clip_t *clip;
clip = _cairo_clip_copy (extents->clip);
clip = _cairo_clip_intersect_boxes (clip, boxes);
if (_cairo_clip_is_all_clipped (clip))
return CAIRO_INT_STATUS_NOTHING_TO_DO;
status = _cairo_clip_get_polygon (clip, &polygon,
&fill_rule, &antialias);
_cairo_clip_path_destroy (clip->path);
clip->path = NULL;
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t *saved_clip = extents->clip;
extents->clip = clip;
status = clip_and_composite_polygon (compositor, extents, &polygon,
fill_rule, antialias);
clip = extents->clip;
extents->clip = saved_clip;
_cairo_polygon_fini (&polygon);
}
_cairo_clip_destroy (clip);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
}
if (boxes->is_pixel_aligned) {
status = composite_aligned_boxes (compositor, extents, boxes);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
}
status = composite_boxes (compositor, extents, boxes);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
status = _cairo_polygon_init_boxes (&polygon, boxes);
if (unlikely (status))
return status;
status = composite_polygon (compositor, extents, &polygon,
CAIRO_FILL_RULE_WINDING,
CAIRO_ANTIALIAS_DEFAULT);
_cairo_polygon_fini (&polygon);
return status;
}
static cairo_int_status_t
clip_and_composite_polygon (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_fill_rule_t fill_rule,
cairo_antialias_t antialias)
{
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
/* XXX simply uses polygon limits.point extemities, tessellation? */
status = trim_extents_to_polygon (extents, polygon);
if (unlikely (status))
return status;
if (_cairo_polygon_is_empty (polygon)) {
cairo_boxes_t boxes;
if (extents->is_bounded)
return CAIRO_STATUS_SUCCESS;
_cairo_boxes_init (&boxes);
extents->bounded.width = extents->bounded.height = 0;
return fixup_unbounded_boxes (compositor, extents, &boxes);
}
if (extents->is_bounded && extents->clip->path) {
cairo_polygon_t clipper;
cairo_antialias_t clip_antialias;
cairo_fill_rule_t clip_fill_rule;
TRACE((stderr, "%s - combining shape with clip polygon\n",
__FUNCTION__));
status = _cairo_clip_get_polygon (extents->clip,
&clipper,
&clip_fill_rule,
&clip_antialias);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t *old_clip;
if (clip_antialias == antialias) {
status = _cairo_polygon_intersect (polygon, fill_rule,
&clipper, clip_fill_rule);
_cairo_polygon_fini (&clipper);
if (unlikely (status))
return status;
old_clip = extents->clip;
extents->clip = _cairo_clip_copy_region (extents->clip);
_cairo_clip_destroy (old_clip);
status = trim_extents_to_polygon (extents, polygon);
if (unlikely (status))
return status;
fill_rule = CAIRO_FILL_RULE_WINDING;
} else {
_cairo_polygon_fini (&clipper);
}
}
}
return composite_polygon (compositor, extents,
polygon, fill_rule, antialias);
}
/* high-level compositor interface */
static cairo_int_status_t
_cairo_spans_compositor_paint (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents)
{
const cairo_spans_compositor_t *compositor = (cairo_spans_compositor_t*)_compositor;
cairo_boxes_t boxes;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
_cairo_clip_steal_boxes (extents->clip, &boxes);
status = clip_and_composite_boxes (compositor, extents, &boxes);
_cairo_clip_unsteal_boxes (extents->clip, &boxes);
return status;
}
static cairo_int_status_t
_cairo_spans_compositor_mask (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents)
{
const cairo_spans_compositor_t *compositor = (cairo_spans_compositor_t*)_compositor;
cairo_int_status_t status;
cairo_boxes_t boxes;
TRACE ((stderr, "%s\n", __FUNCTION__));
_cairo_clip_steal_boxes (extents->clip, &boxes);
status = clip_and_composite_boxes (compositor, extents, &boxes);
_cairo_clip_unsteal_boxes (extents->clip, &boxes);
return status;
}
static cairo_int_status_t
_cairo_spans_compositor_stroke (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents,
const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_antialias_t antialias)
{
const cairo_spans_compositor_t *compositor = (cairo_spans_compositor_t*)_compositor;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
TRACE_ (_cairo_debug_print_path (stderr, path));
TRACE_ (_cairo_debug_print_clip (stderr, extents->clip));
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (_cairo_path_fixed_stroke_is_rectilinear (path)) {
cairo_boxes_t boxes;
_cairo_boxes_init (&boxes);
if (! _cairo_clip_contains_rectangle (extents->clip, &extents->mask))
_cairo_boxes_limit (&boxes,
extents->clip->boxes,
extents->clip->num_boxes);
status = _cairo_path_fixed_stroke_rectilinear_to_boxes (path,
style,
ctm,
antialias,
&boxes);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = clip_and_composite_boxes (compositor, extents, &boxes);
_cairo_boxes_fini (&boxes);
}
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
cairo_polygon_t polygon;
cairo_box_t limits;
cairo_fill_rule_t fill_rule = CAIRO_FILL_RULE_WINDING;
if (! _cairo_rectangle_contains_rectangle (&extents->unbounded,
&extents->mask))
{
if (extents->clip->num_boxes == 1) {
_cairo_polygon_init (&polygon, extents->clip->boxes, 1);
} else {
_cairo_box_from_rectangle (&limits, &extents->unbounded);
_cairo_polygon_init (&polygon, &limits, 1);
}
}
else
{
_cairo_polygon_init (&polygon, NULL, 0);
}
status = _cairo_path_fixed_stroke_to_polygon (path,
style,
ctm, ctm_inverse,
tolerance,
&polygon);
TRACE_ (_cairo_debug_print_polygon (stderr, &polygon));
polygon.num_limits = 0;
if (status == CAIRO_INT_STATUS_SUCCESS && extents->clip->num_boxes > 1) {
status = _cairo_polygon_intersect_with_boxes (&polygon, &fill_rule,
extents->clip->boxes,
extents->clip->num_boxes);
}
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t *saved_clip = extents->clip;
if (extents->is_bounded) {
extents->clip = _cairo_clip_copy_path (extents->clip);
extents->clip = _cairo_clip_intersect_box(extents->clip,
&polygon.extents);
}
status = clip_and_composite_polygon (compositor, extents, &polygon,
fill_rule, antialias);
if (extents->is_bounded) {
_cairo_clip_destroy (extents->clip);
extents->clip = saved_clip;
}
}
_cairo_polygon_fini (&polygon);
}
return status;
}
static cairo_int_status_t
_cairo_spans_compositor_fill (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
const cairo_spans_compositor_t *compositor = (cairo_spans_compositor_t*)_compositor;
cairo_int_status_t status;
TRACE((stderr, "%s op=%d, antialias=%d\n", __FUNCTION__, extents->op, antialias));
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (_cairo_path_fixed_fill_is_rectilinear (path)) {
cairo_boxes_t boxes;
TRACE((stderr, "%s - rectilinear\n", __FUNCTION__));
_cairo_boxes_init (&boxes);
if (! _cairo_clip_contains_rectangle (extents->clip, &extents->mask))
_cairo_boxes_limit (&boxes,
extents->clip->boxes,
extents->clip->num_boxes);
status = _cairo_path_fixed_fill_rectilinear_to_boxes (path,
fill_rule,
antialias,
&boxes);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = clip_and_composite_boxes (compositor, extents, &boxes);
_cairo_boxes_fini (&boxes);
}
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
cairo_polygon_t polygon;
cairo_box_t limits;
TRACE((stderr, "%s - polygon\n", __FUNCTION__));
if (! _cairo_rectangle_contains_rectangle (&extents->unbounded,
&extents->mask))
{
TRACE((stderr, "%s - clipping to bounds\n", __FUNCTION__));
if (extents->clip->num_boxes == 1) {
_cairo_polygon_init (&polygon, extents->clip->boxes, 1);
} else {
_cairo_box_from_rectangle (&limits, &extents->unbounded);
_cairo_polygon_init (&polygon, &limits, 1);
}
}
else
{
_cairo_polygon_init (&polygon, NULL, 0);
}
status = _cairo_path_fixed_fill_to_polygon (path, tolerance, &polygon);
TRACE_ (_cairo_debug_print_polygon (stderr, &polygon));
polygon.num_limits = 0;
if (status == CAIRO_INT_STATUS_SUCCESS && extents->clip->num_boxes > 1) {
TRACE((stderr, "%s - polygon intersect with %d clip boxes\n",
__FUNCTION__, extents->clip->num_boxes));
status = _cairo_polygon_intersect_with_boxes (&polygon, &fill_rule,
extents->clip->boxes,
extents->clip->num_boxes);
}
TRACE_ (_cairo_debug_print_polygon (stderr, &polygon));
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t *saved_clip = extents->clip;
if (extents->is_bounded) {
TRACE((stderr, "%s - polygon discard clip boxes\n",
__FUNCTION__));
extents->clip = _cairo_clip_copy_path (extents->clip);
extents->clip = _cairo_clip_intersect_box(extents->clip,
&polygon.extents);
}
status = clip_and_composite_polygon (compositor, extents, &polygon,
fill_rule, antialias);
if (extents->is_bounded) {
_cairo_clip_destroy (extents->clip);
extents->clip = saved_clip;
}
}
_cairo_polygon_fini (&polygon);
TRACE((stderr, "%s - polygon status=%d\n", __FUNCTION__, status));
}
return status;
}
void
_cairo_spans_compositor_init (cairo_spans_compositor_t *compositor,
const cairo_compositor_t *delegate)
{
compositor->base.delegate = delegate;
compositor->base.paint = _cairo_spans_compositor_paint;
compositor->base.mask = _cairo_spans_compositor_mask;
compositor->base.fill = _cairo_spans_compositor_fill;
compositor->base.stroke = _cairo_spans_compositor_stroke;
compositor->base.glyphs = NULL;
}