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-box-inline.h"
#include "cairo-boxes-private.h"
#include "cairo-clip-inline.h"
#include "cairo-clip-private.h"
#include "cairo-composite-rectangles-private.h"
#include "cairo-compositor-private.h"
#include "cairo-error-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-pattern-inline.h"
#include "cairo-paginated-private.h"
#include "cairo-recording-surface-inline.h"
#include "cairo-surface-subsurface-private.h"
#include "cairo-surface-snapshot-inline.h"
#include "cairo-surface-observer-private.h"
#include "cairo-region-private.h"
#include "cairo-spans-private.h"
#include "cairo-traps-private.h"
#include "cairo-tristrip-private.h"
typedef cairo_int_status_t
(*draw_func_t) (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x,
int src_y,
int dst_x,
int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip);
static void do_unaligned_row(void (*blt)(void *closure,
int16_t x, int16_t y,
int16_t w, int16_t h,
uint16_t coverage),
void *closure,
const cairo_box_t *b,
int tx, int y, int h,
uint16_t coverage)
{
int x1 = _cairo_fixed_integer_part (b->p1.x) - tx;
int x2 = _cairo_fixed_integer_part (b->p2.x) - tx;
if (x2 > x1) {
if (! _cairo_fixed_is_integer (b->p1.x)) {
blt(closure, x1, y, 1, h,
coverage * (256 - _cairo_fixed_fractional_part (b->p1.x)));
x1++;
}
if (x2 > x1)
blt(closure, x1, y, x2-x1, h, (coverage << 8) - (coverage >> 8));
if (! _cairo_fixed_is_integer (b->p2.x))
blt(closure, x2, y, 1, h,
coverage * _cairo_fixed_fractional_part (b->p2.x));
} else
blt(closure, x1, y, 1, h,
coverage * (b->p2.x - b->p1.x));
}
static void do_unaligned_box(void (*blt)(void *closure,
int16_t x, int16_t y,
int16_t w, int16_t h,
uint16_t coverage),
void *closure,
const cairo_box_t *b, int tx, int ty)
{
int y1 = _cairo_fixed_integer_part (b->p1.y) - ty;
int y2 = _cairo_fixed_integer_part (b->p2.y) - ty;
if (y2 > y1) {
if (! _cairo_fixed_is_integer (b->p1.y)) {
do_unaligned_row(blt, closure, b, tx, y1, 1,
256 - _cairo_fixed_fractional_part (b->p1.y));
y1++;
}
if (y2 > y1)
do_unaligned_row(blt, closure, b, tx, y1, y2-y1, 256);
if (! _cairo_fixed_is_integer (b->p2.y))
do_unaligned_row(blt, closure, b, tx, y2, 1,
_cairo_fixed_fractional_part (b->p2.y));
} else
do_unaligned_row(blt, closure, b, tx, y1, 1,
b->p2.y - b->p1.y);
}
struct blt_in {
const cairo_traps_compositor_t *compositor;
cairo_surface_t *dst;
cairo_boxes_t boxes;
};
static void blt_in(void *closure,
int16_t x, int16_t y,
int16_t w, int16_t h,
uint16_t coverage)
{
struct blt_in *info = closure;
cairo_color_t color;
if (CAIRO_ALPHA_SHORT_IS_OPAQUE (coverage))
return;
_cairo_box_from_integers (&info->boxes.chunks.base[0], x, y, w, h);
_cairo_color_init_rgba (&color, 0, 0, 0, coverage / (double) 0xffff);
info->compositor->fill_boxes (info->dst,
CAIRO_OPERATOR_IN, &color,
&info->boxes);
}
static void
add_rect_with_offset (cairo_boxes_t *boxes, int x1, int y1, int x2, int y2, int dx, int dy)
{
cairo_box_t box;
cairo_int_status_t status;
box.p1.x = _cairo_fixed_from_int (x1 - dx);
box.p1.y = _cairo_fixed_from_int (y1 - dy);
box.p2.x = _cairo_fixed_from_int (x2 - dx);
box.p2.y = _cairo_fixed_from_int (y2 - dy);
status = _cairo_boxes_add (boxes, CAIRO_ANTIALIAS_DEFAULT, &box);
assert (status == CAIRO_INT_STATUS_SUCCESS);
}
static cairo_int_status_t
combine_clip_as_traps (const cairo_traps_compositor_t *compositor,
cairo_surface_t *mask,
const cairo_clip_t *clip,
const cairo_rectangle_int_t *extents)
{
cairo_polygon_t polygon;
cairo_fill_rule_t fill_rule;
cairo_antialias_t antialias;
cairo_traps_t traps;
cairo_surface_t *src;
cairo_box_t box;
cairo_rectangle_int_t fixup;
int src_x, src_y;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = _cairo_clip_get_polygon (clip, &polygon,
&fill_rule, &antialias);
if (status)
return status;
_cairo_traps_init (&traps);
status = _cairo_bentley_ottmann_tessellate_polygon (&traps,
&polygon,
fill_rule);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
return status;
src = compositor->pattern_to_surface (mask, NULL, FALSE,
extents, NULL,
&src_x, &src_y);
if (unlikely (src->status)) {
_cairo_traps_fini (&traps);
return src->status;
}
status = compositor->composite_traps (mask, CAIRO_OPERATOR_IN, src,
src_x, src_y,
extents->x, extents->y,
extents,
antialias, &traps);
_cairo_traps_extents (&traps, &box);
_cairo_box_round_to_rectangle (&box, &fixup);
_cairo_traps_fini (&traps);
cairo_surface_destroy (src);
if (unlikely (status))
return status;
if (! _cairo_rectangle_intersect (&fixup, extents))
return CAIRO_STATUS_SUCCESS;
if (fixup.width < extents->width || fixup.height < extents->height) {
cairo_boxes_t clear;
_cairo_boxes_init (&clear);
/* top */
if (fixup.y != extents->y) {
add_rect_with_offset (&clear,
extents->x, extents->y,
extents->x + extents->width,
fixup.y,
extents->x, extents->y);
}
/* left */
if (fixup.x != extents->x) {
add_rect_with_offset (&clear,
extents->x, fixup.y,
fixup.x,
fixup.y + fixup.height,
extents->x, extents->y);
}
/* right */
if (fixup.x + fixup.width != extents->x + extents->width) {
add_rect_with_offset (&clear,
fixup.x + fixup.width,
fixup.y,
extents->x + extents->width,
fixup.y + fixup.height,
extents->x, extents->y);
}
/* bottom */
if (fixup.y + fixup.height != extents->y + extents->height) {
add_rect_with_offset (&clear,
extents->x,
fixup.y + fixup.height,
extents->x + extents->width,
extents->y + extents->height,
extents->x, extents->y);
}
status = compositor->fill_boxes (mask,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear);
_cairo_boxes_fini (&clear);
}
return status;
}
static cairo_status_t
__clip_to_surface (const cairo_traps_compositor_t *compositor,
const cairo_composite_rectangles_t *composite,
const cairo_rectangle_int_t *extents,
cairo_surface_t **surface)
{
cairo_surface_t *mask;
cairo_polygon_t polygon;
cairo_fill_rule_t fill_rule;
cairo_antialias_t antialias;
cairo_traps_t traps;
cairo_boxes_t clear;
cairo_surface_t *src;
int src_x, src_y;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = _cairo_clip_get_polygon (composite->clip, &polygon,
&fill_rule, &antialias);
if (status)
return status;
_cairo_traps_init (&traps);
status = _cairo_bentley_ottmann_tessellate_polygon (&traps,
&polygon,
fill_rule);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
return status;
mask = _cairo_surface_create_scratch (composite->surface,
CAIRO_CONTENT_ALPHA,
extents->width,
extents->height,
NULL);
if (unlikely (mask->status)) {
_cairo_traps_fini (&traps);
return status;
}
src = compositor->pattern_to_surface (mask, NULL, FALSE,
extents, NULL,
&src_x, &src_y);
if (unlikely (status = src->status))
goto error;
status = compositor->acquire (mask);
if (unlikely (status))
goto error;
_cairo_boxes_init_from_rectangle (&clear,
0, 0,
extents->width,
extents->height);
status = compositor->fill_boxes (mask,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear);
if (unlikely (status))
goto error_release;
status = compositor->composite_traps (mask, CAIRO_OPERATOR_ADD, src,
src_x, src_y,
extents->x, extents->y,
extents,
antialias, &traps);
if (unlikely (status))
goto error_release;
compositor->release (mask);
*surface = mask;
out:
cairo_surface_destroy (src);
_cairo_traps_fini (&traps);
return status;
error_release:
compositor->release (mask);
error:
cairo_surface_destroy (mask);
goto out;
}
static cairo_surface_t *
traps_get_clip_surface (const cairo_traps_compositor_t *compositor,
const cairo_composite_rectangles_t *composite,
const cairo_rectangle_int_t *extents)
{
cairo_surface_t *surface = NULL;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = __clip_to_surface (compositor, composite, extents, &surface);
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
surface = _cairo_surface_create_scratch (composite->surface,
CAIRO_CONTENT_ALPHA,
extents->width,
extents->height,
CAIRO_COLOR_WHITE);
if (unlikely (surface->status))
return surface;
status = _cairo_clip_combine_with_surface (composite->clip, surface,
extents->x, extents->y);
}
if (unlikely (status)) {
cairo_surface_destroy (surface);
surface = _cairo_surface_create_in_error (status);
}
return surface;
}
static void blt_unaligned_boxes(const cairo_traps_compositor_t *compositor,
cairo_surface_t *surface,
int dx, int dy,
cairo_box_t *boxes,
int num_boxes)
{
struct blt_in info;
int i;
info.compositor = compositor;
info.dst = surface;
_cairo_boxes_init (&info.boxes);
info.boxes.num_boxes = 1;
for (i = 0; i < num_boxes; i++) {
cairo_box_t *b = &boxes[i];
if (! _cairo_fixed_is_integer (b->p1.x) ||
! _cairo_fixed_is_integer (b->p1.y) ||
! _cairo_fixed_is_integer (b->p2.x) ||
! _cairo_fixed_is_integer (b->p2.y))
{
do_unaligned_box(blt_in, &info, b, dx, dy);
}
}
}
static cairo_surface_t *
create_composite_mask (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *draw_closure,
draw_func_t draw_func,
draw_func_t mask_func,
const cairo_composite_rectangles_t *extents)
{
cairo_surface_t *surface, *src;
cairo_int_status_t status;
int src_x, src_y;
TRACE ((stderr, "%s\n", __FUNCTION__));
surface = _cairo_surface_create_scratch (dst, CAIRO_CONTENT_ALPHA,
extents->bounded.width,
extents->bounded.height,
NULL);
if (unlikely (surface->status))
return surface;
src = compositor->pattern_to_surface (surface,
&_cairo_pattern_white.base,
FALSE,
&extents->bounded,
&extents->bounded,
&src_x, &src_y);
if (unlikely (src->status)) {
cairo_surface_destroy (surface);
return src;
}
status = compositor->acquire (surface);
if (unlikely (status)) {
cairo_surface_destroy (src);
cairo_surface_destroy (surface);
return _cairo_surface_create_in_error (status);
}
if (!surface->is_clear) {
cairo_boxes_t clear;
_cairo_boxes_init_from_rectangle (&clear,
0, 0,
extents->bounded.width,
extents->bounded.height);
status = compositor->fill_boxes (surface,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear);
if (unlikely (status))
goto error;
surface->is_clear = TRUE;
}
if (mask_func) {
status = mask_func (compositor, surface, draw_closure,
CAIRO_OPERATOR_SOURCE, src, src_x, src_y,
extents->bounded.x, extents->bounded.y,
&extents->bounded, extents->clip);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
surface->is_clear = FALSE;
goto out;
}
if (unlikely (status != CAIRO_INT_STATUS_UNSUPPORTED))
goto error;
}
/* Is it worth setting the clip region here? */
status = draw_func (compositor, surface, draw_closure,
CAIRO_OPERATOR_ADD, src, src_x, src_y,
extents->bounded.x, extents->bounded.y,
&extents->bounded, NULL);
if (unlikely (status))
goto error;
surface->is_clear = FALSE;
if (extents->clip->path != NULL) {
status = combine_clip_as_traps (compositor, surface,
extents->clip, &extents->bounded);
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
status = _cairo_clip_combine_with_surface (extents->clip, surface,
extents->bounded.x,
extents->bounded.y);
}
if (unlikely (status))
goto error;
} else if (extents->clip->boxes) {
blt_unaligned_boxes(compositor, surface,
extents->bounded.x, extents->bounded.y,
extents->clip->boxes, extents->clip->num_boxes);
}
out:
compositor->release (surface);
cairo_surface_destroy (src);
return surface;
error:
compositor->release (surface);
if (status != CAIRO_INT_STATUS_NOTHING_TO_DO) {
cairo_surface_destroy (surface);
surface = _cairo_surface_create_in_error (status);
}
cairo_surface_destroy (src);
return surface;
}
/* 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 (const cairo_traps_compositor_t *compositor,
const cairo_composite_rectangles_t*extents,
draw_func_t draw_func,
draw_func_t mask_func,
void *draw_closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x, int src_y)
{
cairo_surface_t *dst = extents->surface;
cairo_surface_t *mask;
TRACE ((stderr, "%s\n", __FUNCTION__));
mask = create_composite_mask (compositor, dst, draw_closure,
draw_func, mask_func,
extents);
if (unlikely (mask->status))
return mask->status;
if (mask->is_clear)
goto skip;
if (src != NULL || dst->content != CAIRO_CONTENT_ALPHA) {
compositor->composite (dst, op, src, mask,
extents->bounded.x + src_x,
extents->bounded.y + src_y,
0, 0,
extents->bounded.x, extents->bounded.y,
extents->bounded.width, extents->bounded.height);
} else {
compositor->composite (dst, op, mask, NULL,
0, 0,
0, 0,
extents->bounded.x, extents->bounded.y,
extents->bounded.width, extents->bounded.height);
}
skip:
cairo_surface_destroy (mask);
return CAIRO_STATUS_SUCCESS;
}
/* 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 (const cairo_traps_compositor_t *compositor,
const cairo_composite_rectangles_t*extents,
draw_func_t draw_func,
void *draw_closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x, int src_y)
{
cairo_surface_t *dst = extents->surface;
cairo_surface_t *tmp, *clip;
cairo_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
tmp = _cairo_surface_create_scratch (dst, dst->content,
extents->bounded.width,
extents->bounded.height,
NULL);
if (unlikely (tmp->status))
return tmp->status;
status = compositor->acquire (tmp);
if (unlikely (status)) {
cairo_surface_destroy (tmp);
return status;
}
compositor->composite (tmp,
dst->is_clear ? CAIRO_OPERATOR_CLEAR : CAIRO_OPERATOR_SOURCE,
dst, NULL,
extents->bounded.x, extents->bounded.y,
0, 0,
0, 0,
extents->bounded.width, extents->bounded.height);
status = draw_func (compositor, tmp, draw_closure, op,
src, src_x, src_y,
extents->bounded.x, extents->bounded.y,
&extents->bounded, NULL);
if (unlikely (status))
goto cleanup;
clip = traps_get_clip_surface (compositor, extents, &extents->bounded);
if (unlikely ((status = clip->status)))
goto cleanup;
if (dst->is_clear) {
compositor->composite (dst, CAIRO_OPERATOR_SOURCE, tmp, clip,
0, 0,
0, 0,
extents->bounded.x, extents->bounded.y,
extents->bounded.width, extents->bounded.height);
} else {
compositor->lerp (dst, tmp, clip,
0, 0,
0,0,
extents->bounded.x, extents->bounded.y,
extents->bounded.width, extents->bounded.height);
}
cairo_surface_destroy (clip);
cleanup:
compositor->release (tmp);
cairo_surface_destroy (tmp);
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 (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
draw_func_t draw_func,
draw_func_t mask_func,
void *draw_closure,
cairo_surface_t *src,
int src_x,
int src_y,
const cairo_composite_rectangles_t *extents)
{
cairo_surface_t *mask;
TRACE ((stderr, "%s\n", __FUNCTION__));
/* Create a surface that is mask IN clip */
mask = create_composite_mask (compositor, dst, draw_closure,
draw_func, mask_func,
extents);
if (unlikely (mask->status))
return mask->status;
if (mask->is_clear)
goto skip;
if (dst->is_clear) {
compositor->composite (dst, CAIRO_OPERATOR_SOURCE, src, mask,
extents->bounded.x + src_x, extents->bounded.y + src_y,
0, 0,
extents->bounded.x, extents->bounded.y,
extents->bounded.width, extents->bounded.height);
} else {
compositor->lerp (dst, src, mask,
extents->bounded.x + src_x, extents->bounded.y + src_y,
0, 0,
extents->bounded.x, extents->bounded.y,
extents->bounded.width, extents->bounded.height);
}
skip:
cairo_surface_destroy (mask);
return CAIRO_STATUS_SUCCESS;
}
static cairo_bool_t
can_reduce_alpha_op (cairo_operator_t op)
{
int iop = op;
switch (iop) {
case CAIRO_OPERATOR_OVER:
case CAIRO_OPERATOR_SOURCE:
case CAIRO_OPERATOR_ADD:
return TRUE;
default:
return FALSE;
}
}
static cairo_bool_t
reduce_alpha_op (cairo_composite_rectangles_t *extents)
{
cairo_surface_t *dst = extents->surface;
cairo_operator_t op = extents->op;
const cairo_pattern_t *pattern = &extents->source_pattern.base;
return dst->is_clear &&
dst->content == CAIRO_CONTENT_ALPHA &&
_cairo_pattern_is_opaque_solid (pattern) &&
can_reduce_alpha_op (op);
}
static cairo_status_t
fixup_unbounded_with_mask (const cairo_traps_compositor_t *compositor,
const cairo_composite_rectangles_t *extents)
{
cairo_surface_t *dst = extents->surface;
cairo_surface_t *mask;
TRACE ((stderr, "%s\n", __FUNCTION__));
/* XXX can we avoid querying the clip surface again? */
mask = traps_get_clip_surface (compositor, extents, &extents->unbounded);
if (unlikely (mask->status))
return mask->status;
/* top */
if (extents->bounded.y != extents->unbounded.y) {
int x = extents->unbounded.x;
int y = extents->unbounded.y;
int width = extents->unbounded.width;
int height = extents->bounded.y - y;
compositor->composite (dst, CAIRO_OPERATOR_DEST_OUT, mask, NULL,
0, 0,
0, 0,
x, y,
width, height);
}
/* left */
if (extents->bounded.x != extents->unbounded.x) {
int x = extents->unbounded.x;
int y = extents->bounded.y;
int width = extents->bounded.x - x;
int height = extents->bounded.height;
compositor->composite (dst, CAIRO_OPERATOR_DEST_OUT, mask, NULL,
0, y - extents->unbounded.y,
0, 0,
x, y,
width, height);
}
/* right */
if (extents->bounded.x + extents->bounded.width != extents->unbounded.x + extents->unbounded.width) {
int x = extents->bounded.x + extents->bounded.width;
int y = extents->bounded.y;
int width = extents->unbounded.x + extents->unbounded.width - x;
int height = extents->bounded.height;
compositor->composite (dst, CAIRO_OPERATOR_DEST_OUT, mask, NULL,
x - extents->unbounded.x, y - extents->unbounded.y,
0, 0,
x, y,
width, height);
}
/* bottom */
if (extents->bounded.y + extents->bounded.height != extents->unbounded.y + extents->unbounded.height) {
int x = extents->unbounded.x;
int y = extents->bounded.y + extents->bounded.height;
int width = extents->unbounded.width;
int height = extents->unbounded.y + extents->unbounded.height - y;
compositor->composite (dst, CAIRO_OPERATOR_DEST_OUT, mask, NULL,
0, y - extents->unbounded.y,
0, 0,
x, y,
width, height);
}
cairo_surface_destroy (mask);
return CAIRO_STATUS_SUCCESS;
}
static void
add_rect (cairo_boxes_t *boxes, int x1, int y1, int x2, int y2)
{
cairo_box_t box;
cairo_int_status_t status;
box.p1.x = _cairo_fixed_from_int (x1);
box.p1.y = _cairo_fixed_from_int (y1);
box.p2.x = _cairo_fixed_from_int (x2);
box.p2.y = _cairo_fixed_from_int (y2);
status = _cairo_boxes_add (boxes, CAIRO_ANTIALIAS_DEFAULT, &box);
assert (status == CAIRO_INT_STATUS_SUCCESS);
}
static cairo_status_t
fixup_unbounded (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_surface_t *dst = extents->surface;
cairo_boxes_t clear, tmp;
cairo_box_t box;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (extents->bounded.width == extents->unbounded.width &&
extents->bounded.height == extents->unbounded.height)
{
return CAIRO_STATUS_SUCCESS;
}
assert (extents->clip->path == NULL);
/* 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 == NULL) {
if (extents->bounded.width == 0 || extents->bounded.height == 0) {
goto empty;
} else {
/* top */
if (extents->bounded.y != extents->unbounded.y) {
add_rect (&clear,
extents->unbounded.x, extents->unbounded.y,
extents->unbounded.x + extents->unbounded.width,
extents->bounded.y);
}
/* left */
if (extents->bounded.x != extents->unbounded.x) {
add_rect (&clear,
extents->unbounded.x, extents->bounded.y,
extents->bounded.x,
extents->bounded.y + extents->bounded.height);
}
/* right */
if (extents->bounded.x + extents->bounded.width != extents->unbounded.x + extents->unbounded.width) {
add_rect (&clear,
extents->bounded.x + extents->bounded.width,
extents->bounded.y,
extents->unbounded.x + extents->unbounded.width,
extents->bounded.y + extents->bounded.height);
}
/* bottom */
if (extents->bounded.y + extents->bounded.height != extents->unbounded.y + extents->unbounded.height) {
add_rect (&clear,
extents->unbounded.x,
extents->bounded.y + extents->bounded.height,
extents->unbounded.x + extents->unbounded.width,
extents->unbounded.y + extents->unbounded.height);
}
}
} else if (boxes->num_boxes) {
_cairo_boxes_init (&tmp);
assert (boxes->is_pixel_aligned);
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 {
empty:
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);
}
/* Now 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;
}
status = compositor->fill_boxes (dst,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear);
error:
_cairo_boxes_fini (&clear);
return status;
}
enum {
NEED_CLIP_REGION = 0x1,
NEED_CLIP_SURFACE = 0x2,
FORCE_CLIP_REGION = 0x4,
};
static cairo_bool_t
need_bounded_clip (cairo_composite_rectangles_t *extents)
{
unsigned int flags = 0;
if (extents->clip->num_boxes > 1 ||
extents->mask.width > extents->unbounded.width ||
extents->mask.height > extents->unbounded.height)
{
flags |= NEED_CLIP_REGION;
}
if (extents->clip->num_boxes > 1 ||
extents->mask.width > extents->bounded.width ||
extents->mask.height > extents->bounded.height)
{
flags |= FORCE_CLIP_REGION;
}
if (! _cairo_clip_is_region (extents->clip))
flags |= NEED_CLIP_SURFACE;
return flags;
}
static cairo_bool_t
need_unbounded_clip (cairo_composite_rectangles_t *extents)
{
unsigned int flags = 0;
if (! extents->is_bounded) {
flags |= NEED_CLIP_REGION;
if (! _cairo_clip_is_region (extents->clip))
flags |= NEED_CLIP_SURFACE;
}
if (extents->clip->path != NULL)
flags |= NEED_CLIP_SURFACE;
return flags;
}
static cairo_status_t
clip_and_composite (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
draw_func_t draw_func,
draw_func_t mask_func,
void *draw_closure,
unsigned int need_clip)
{
cairo_surface_t *dst = extents->surface;
cairo_operator_t op = extents->op;
cairo_pattern_t *source = &extents->source_pattern.base;
cairo_surface_t *src;
int src_x, src_y;
cairo_region_t *clip_region = NULL;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (reduce_alpha_op (extents)) {
op = CAIRO_OPERATOR_ADD;
source = NULL;
}
if (op == CAIRO_OPERATOR_CLEAR) {
op = CAIRO_OPERATOR_DEST_OUT;
source = NULL;
}
compositor->acquire (dst);
if (need_clip & NEED_CLIP_REGION) {
const cairo_rectangle_int_t *limit;
if ((need_clip & FORCE_CLIP_REGION) == 0)
limit = &extents->unbounded;
else
limit = &extents->destination;
clip_region = _cairo_clip_get_region (extents->clip);
if (clip_region != NULL &&
cairo_region_contains_rectangle (clip_region,
limit) == CAIRO_REGION_OVERLAP_IN)
clip_region = NULL;
if (clip_region != NULL) {
status = compositor->set_clip_region (dst, clip_region);
if (unlikely (status)) {
compositor->release (dst);
return status;
}
}
}
if (extents->bounded.width == 0 || extents->bounded.height == 0)
goto skip;
src = compositor->pattern_to_surface (dst, source, FALSE,
&extents->bounded,
&extents->source_sample_area,
&src_x, &src_y);
if (unlikely (status = src->status))
goto error;
if (op == CAIRO_OPERATOR_SOURCE) {
status = clip_and_composite_source (compositor, dst,
draw_func, mask_func, draw_closure,
src, src_x, src_y,
extents);
} else {
if (need_clip & NEED_CLIP_SURFACE) {
if (extents->is_bounded) {
status = clip_and_composite_with_mask (compositor, extents,
draw_func, mask_func,
draw_closure,
op, src, src_x, src_y);
} else {
status = clip_and_composite_combine (compositor, extents,
draw_func, draw_closure,
op, src, src_x, src_y);
}
} else {
status = draw_func (compositor,
dst, draw_closure,
op, src, src_x, src_y,
0, 0,
&extents->bounded,
extents->clip);
}
}
cairo_surface_destroy (src);
skip:
if (status == CAIRO_STATUS_SUCCESS && ! extents->is_bounded) {
if (need_clip & NEED_CLIP_SURFACE)
status = fixup_unbounded_with_mask (compositor, extents);
else
status = fixup_unbounded (compositor, extents, NULL);
}
error:
if (clip_region)
compositor->set_clip_region (dst, NULL);
compositor->release (dst);
return status;
}
/* meta-ops */
typedef struct {
cairo_traps_t traps;
cairo_antialias_t antialias;
} composite_traps_info_t;
static cairo_int_status_t
composite_traps (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x, int src_y,
int dst_x, int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
composite_traps_info_t *info = closure;
TRACE ((stderr, "%s\n", __FUNCTION__));
return compositor->composite_traps (dst, op, src,
src_x - dst_x, src_y - dst_y,
dst_x, dst_y,
extents,
info->antialias, &info->traps);
}
typedef struct {
cairo_tristrip_t strip;
cairo_antialias_t antialias;
} composite_tristrip_info_t;
static cairo_int_status_t
composite_tristrip (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x, int src_y,
int dst_x, int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
composite_tristrip_info_t *info = closure;
TRACE ((stderr, "%s\n", __FUNCTION__));
return compositor->composite_tristrip (dst, op, src,
src_x - dst_x, src_y - dst_y,
dst_x, dst_y,
extents,
info->antialias, &info->strip);
}
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;
surface = _cairo_surface_get_source (surface, NULL);
return _cairo_surface_is_recording (surface);
}
static cairo_surface_t *
recording_pattern_get_surface (const cairo_pattern_t *pattern)
{
cairo_surface_t *surface;
surface = ((const cairo_surface_pattern_t *) pattern)->surface;
return _cairo_surface_get_source (surface, NULL);
}
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 *) recording_pattern_get_surface (pattern);
if (surface->unbounded)
return TRUE;
return _cairo_rectangle_contains_rectangle (&surface->extents, sample);
}
static cairo_bool_t
op_reduces_to_source (cairo_composite_rectangles_t *extents)
{
if (extents->op == CAIRO_OPERATOR_SOURCE)
return TRUE;
if (extents->surface->is_clear)
return extents->op == CAIRO_OPERATOR_OVER || extents->op == CAIRO_OPERATOR_ADD;
return FALSE;
}
static cairo_status_t
composite_aligned_boxes (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_surface_t *dst = extents->surface;
cairo_operator_t op = extents->op;
cairo_bool_t need_clip_mask = ! _cairo_clip_is_region (extents->clip);
cairo_bool_t op_is_source;
cairo_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (need_clip_mask &&
(! extents->is_bounded || extents->op == CAIRO_OPERATOR_SOURCE))
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
op_is_source = op_reduces_to_source (extents);
/* Are we just copying a recording surface? */
if (! need_clip_mask && op_is_source &&
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->acquire (dst);
if (unlikely (status))
return status;
status = compositor->fill_boxes (dst,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
boxes);
compositor->release (dst);
if (unlikely (status))
return status;
}
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 (recording_pattern_get_surface (source),
m, dst, recording_clip);
_cairo_clip_destroy (recording_clip);
return status;
}
status = compositor->acquire (dst);
if (unlikely (status))
return status;
if (! need_clip_mask &&
(op == CAIRO_OPERATOR_CLEAR ||
extents->source_pattern.base.type == CAIRO_PATTERN_TYPE_SOLID))
{
const cairo_color_t *color;
if (op == CAIRO_OPERATOR_CLEAR) {
color = CAIRO_COLOR_TRANSPARENT;
} else {
color = &((cairo_solid_pattern_t *) &extents->source_pattern)->color;
if (op_is_source)
op = CAIRO_OPERATOR_SOURCE;
}
status = compositor->fill_boxes (dst, op, color, boxes);
}
else
{
cairo_surface_t *src, *mask = NULL;
cairo_pattern_t *source = &extents->source_pattern.base;
int src_x, src_y;
int mask_x = 0, mask_y = 0;
if (need_clip_mask) {
mask = traps_get_clip_surface (compositor,
extents, &extents->bounded);
if (unlikely (mask->status))
return mask->status;
mask_x = -extents->bounded.x;
mask_y = -extents->bounded.y;
if (op == CAIRO_OPERATOR_CLEAR) {
source = NULL;
op = CAIRO_OPERATOR_DEST_OUT;
}
} else if (op_is_source)
op = CAIRO_OPERATOR_SOURCE;
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_STATUS_SUCCESS && ! extents->is_bounded)
status = fixup_unbounded (compositor, extents, boxes);
compositor->release (dst);
return status;
}
static cairo_status_t
upload_boxes (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_surface_t *dst = extents->surface;
const cairo_pattern_t *source = &extents->source_pattern.base;
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((cairo_surface_pattern_t *)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->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_int_status_t
trim_extents_to_traps (cairo_composite_rectangles_t *extents,
cairo_traps_t *traps)
{
cairo_box_t box;
_cairo_traps_extents (traps, &box);
return _cairo_composite_rectangles_intersect_mask_extents (extents, &box);
}
static cairo_int_status_t
trim_extents_to_tristrip (cairo_composite_rectangles_t *extents,
cairo_tristrip_t *strip)
{
cairo_box_t box;
_cairo_tristrip_extents (strip, &box);
return _cairo_composite_rectangles_intersect_mask_extents (extents, &box);
}
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
boxes_for_traps (cairo_boxes_t *boxes,
cairo_traps_t *traps,
cairo_antialias_t antialias)
{
int i, j;
/* first check that the traps are rectilinear */
if (antialias == CAIRO_ANTIALIAS_NONE) {
for (i = 0; i < traps->num_traps; i++) {
const cairo_trapezoid_t *t = &traps->traps[i];
if (_cairo_fixed_integer_round_down (t->left.p1.x) !=
_cairo_fixed_integer_round_down (t->left.p2.x) ||
_cairo_fixed_integer_round_down (t->right.p1.x) !=
_cairo_fixed_integer_round_down (t->right.p2.x))
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
}
} else {
for (i = 0; i < traps->num_traps; i++) {
const cairo_trapezoid_t *t = &traps->traps[i];
if (t->left.p1.x != t->left.p2.x || t->right.p1.x != t->right.p2.x)
return CAIRO_INT_STATUS_UNSUPPORTED;
}
}
_cairo_boxes_init (boxes);
boxes->chunks.base = (cairo_box_t *) traps->traps;
boxes->chunks.size = traps->num_traps;
if (antialias != CAIRO_ANTIALIAS_NONE) {
for (i = j = 0; i < traps->num_traps; i++) {
/* Note the traps and boxes alias so we need to take the local copies first. */
cairo_fixed_t x1 = traps->traps[i].left.p1.x;
cairo_fixed_t x2 = traps->traps[i].right.p1.x;
cairo_fixed_t y1 = traps->traps[i].top;
cairo_fixed_t y2 = traps->traps[i].bottom;
if (x1 == x2 || y1 == y2)
continue;
boxes->chunks.base[j].p1.x = x1;
boxes->chunks.base[j].p1.y = y1;
boxes->chunks.base[j].p2.x = x2;
boxes->chunks.base[j].p2.y = y2;
j++;
if (boxes->is_pixel_aligned) {
boxes->is_pixel_aligned =
_cairo_fixed_is_integer (x1) && _cairo_fixed_is_integer (y1) &&
_cairo_fixed_is_integer (x2) && _cairo_fixed_is_integer (y2);
}
}
} else {
boxes->is_pixel_aligned = TRUE;
for (i = j = 0; i < traps->num_traps; i++) {
/* Note the traps and boxes alias so we need to take the local copies first. */
cairo_fixed_t x1 = traps->traps[i].left.p1.x;
cairo_fixed_t x2 = traps->traps[i].right.p1.x;
cairo_fixed_t y1 = traps->traps[i].top;
cairo_fixed_t y2 = traps->traps[i].bottom;
/* round down here to match Pixman's behavior when using traps. */
boxes->chunks.base[j].p1.x = _cairo_fixed_round_down (x1);
boxes->chunks.base[j].p1.y = _cairo_fixed_round_down (y1);
boxes->chunks.base[j].p2.x = _cairo_fixed_round_down (x2);
boxes->chunks.base[j].p2.y = _cairo_fixed_round_down (y2);
j += (boxes->chunks.base[j].p1.x != boxes->chunks.base[j].p2.x &&
boxes->chunks.base[j].p1.y != boxes->chunks.base[j].p2.y);
}
}
boxes->chunks.count = j;
boxes->num_boxes = j;
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_status_t
clip_and_composite_boxes (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes);
static cairo_status_t
clip_and_composite_polygon (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_antialias_t antialias,
cairo_fill_rule_t fill_rule,
cairo_bool_t curvy)
{
composite_traps_info_t traps;
cairo_surface_t *dst = extents->surface;
cairo_bool_t clip_surface = ! _cairo_clip_is_region (extents->clip);
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (polygon->num_edges == 0) {
status = CAIRO_INT_STATUS_SUCCESS;
if (! extents->is_bounded) {
cairo_region_t *clip_region = _cairo_clip_get_region (extents->clip);
if (clip_region &&
cairo_region_contains_rectangle (clip_region,
&extents->unbounded) == CAIRO_REGION_OVERLAP_IN)
clip_region = NULL;
if (clip_region != NULL) {
status = compositor->set_clip_region (dst, clip_region);
if (unlikely (status))
return status;
}
if (clip_surface)
status = fixup_unbounded_with_mask (compositor, extents);
else
status = fixup_unbounded (compositor, extents, NULL);
if (clip_region != NULL)
compositor->set_clip_region (dst, NULL);
}
return status;
}
if (extents->clip->path != NULL && extents->is_bounded) {
cairo_polygon_t clipper;
cairo_fill_rule_t clipper_fill_rule;
cairo_antialias_t clipper_antialias;
status = _cairo_clip_get_polygon (extents->clip,
&clipper,
&clipper_fill_rule,
&clipper_antialias);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
if (clipper_antialias == antialias) {
status = _cairo_polygon_intersect (polygon, fill_rule,
&clipper, clipper_fill_rule);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t * clip = _cairo_clip_copy_region (extents->clip);
_cairo_clip_destroy (extents->clip);
extents->clip = clip;
fill_rule = CAIRO_FILL_RULE_WINDING;
}
_cairo_polygon_fini (&clipper);
}
}
}
if (antialias == CAIRO_ANTIALIAS_NONE && curvy) {
cairo_boxes_t boxes;
_cairo_boxes_init (&boxes);
status = _cairo_rasterise_polygon_to_boxes (polygon, fill_rule, &boxes);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
assert (boxes.is_pixel_aligned);
status = clip_and_composite_boxes (compositor, extents, &boxes);
}
_cairo_boxes_fini (&boxes);
if ((status != CAIRO_INT_STATUS_UNSUPPORTED))
return status;
}
_cairo_traps_init (&traps.traps);
if (antialias == CAIRO_ANTIALIAS_NONE && curvy) {
status = _cairo_rasterise_polygon_to_traps (polygon, fill_rule, antialias, &traps.traps);
} else {
status = _cairo_bentley_ottmann_tessellate_polygon (&traps.traps, polygon, fill_rule);
}
if (unlikely (status))
goto CLEANUP_TRAPS;
status = trim_extents_to_traps (extents, &traps.traps);
if (unlikely (status))
goto CLEANUP_TRAPS;
/* Use a fast path if the trapezoids consist of a set of boxes. */
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (1) {
cairo_boxes_t boxes;
status = boxes_for_traps (&boxes, &traps.traps, antialias);
if (status == CAIRO_INT_STATUS_SUCCESS) {
status = clip_and_composite_boxes (compositor, extents, &boxes);
/* XXX need to reconstruct the traps! */
assert (status != CAIRO_INT_STATUS_UNSUPPORTED);
}
}
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
/* Otherwise render the trapezoids to a mask and composite in the usual
* fashion.
*/
unsigned int flags = 0;
/* For unbounded operations, the X11 server will estimate the
* affected rectangle and apply the operation to that. However,
* there are cases where this is an overestimate (e.g. the
* clip-fill-{eo,nz}-unbounded test).
*
* The clip will trim that overestimate to our expectations.
*/
if (! extents->is_bounded)
flags |= FORCE_CLIP_REGION;
traps.antialias = antialias;
status = clip_and_composite (compositor, extents,
composite_traps, NULL, &traps,
need_unbounded_clip (extents) | flags);
}
CLEANUP_TRAPS:
_cairo_traps_fini (&traps.traps);
return status;
}
struct composite_opacity_info {
const cairo_traps_compositor_t *compositor;
uint8_t op;
cairo_surface_t *dst;
cairo_surface_t *src;
int src_x, src_y;
double opacity;
};
static void composite_opacity(void *closure,
int16_t x, int16_t y,
int16_t w, int16_t h,
uint16_t coverage)
{
struct composite_opacity_info *info = closure;
const cairo_traps_compositor_t *compositor = info->compositor;
cairo_surface_t *mask;
int mask_x, mask_y;
cairo_color_t color;
cairo_solid_pattern_t solid;
_cairo_color_init_rgba (&color, 0, 0, 0, info->opacity * coverage);
_cairo_pattern_init_solid (&solid, &color);
mask = compositor->pattern_to_surface (info->dst, &solid.base, TRUE,
&_cairo_unbounded_rectangle,
&_cairo_unbounded_rectangle,
&mask_x, &mask_y);
if (likely (mask->status == CAIRO_STATUS_SUCCESS)) {
if (info->src) {
compositor->composite (info->dst, info->op, info->src, mask,
x + info->src_x, y + info->src_y,
mask_x, mask_y,
x, y,
w, h);
} else {
compositor->composite (info->dst, info->op, mask, NULL,
mask_x, mask_y,
0, 0,
x, y,
w, h);
}
}
cairo_surface_destroy (mask);
}
static cairo_int_status_t
composite_opacity_boxes (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x,
int src_y,
int dst_x,
int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
const cairo_solid_pattern_t *mask = closure;
struct composite_opacity_info info;
int i;
TRACE ((stderr, "%s\n", __FUNCTION__));
info.compositor = compositor;
info.op = op;
info.dst = dst;
info.src = src;
info.src_x = src_x;
info.src_y = src_y;
info.opacity = mask->color.alpha / (double) 0xffff;
/* XXX for lots of boxes create a clip region for the fully opaque areas */
for (i = 0; i < clip->num_boxes; i++)
do_unaligned_box(composite_opacity, &info,
&clip->boxes[i], dst_x, dst_y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
composite_boxes (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x,
int src_y,
int dst_x,
int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
cairo_traps_t traps;
cairo_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = _cairo_traps_init_boxes (&traps, closure);
if (unlikely (status))
return status;
status = compositor->composite_traps (dst, op, src,
src_x - dst_x, src_y - dst_y,
dst_x, dst_y,
extents,
CAIRO_ANTIALIAS_DEFAULT, &traps);
_cairo_traps_fini (&traps);
return status;
}
static cairo_status_t
clip_and_composite_boxes (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (boxes->num_boxes == 0 && extents->is_bounded)
return CAIRO_STATUS_SUCCESS;
status = trim_extents_to_boxes (extents, boxes);
if (unlikely (status))
return status;
if (boxes->is_pixel_aligned && extents->clip->path == NULL &&
extents->source_pattern.base.type == CAIRO_PATTERN_TYPE_SURFACE &&
(op_reduces_to_source (extents) ||
(extents->op == CAIRO_OPERATOR_OVER &&
(extents->source_pattern.surface.surface->content & CAIRO_CONTENT_ALPHA) == 0)))
{
status = upload_boxes (compositor, extents, boxes);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
}
/* 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,
antialias, fill_rule, FALSE);
clip = extents->clip;
extents->clip = saved_clip;
_cairo_polygon_fini (&polygon);
}
_cairo_clip_destroy (clip);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
}
/* Use a fast path if the boxes are pixel aligned (or nearly aligned!) */
if (boxes->is_pixel_aligned) {
status = composite_aligned_boxes (compositor, extents, boxes);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
}
return clip_and_composite (compositor, extents,
composite_boxes, NULL, boxes,
need_unbounded_clip (extents));
}
static cairo_int_status_t
composite_traps_as_boxes (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
composite_traps_info_t *info)
{
cairo_boxes_t boxes;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (! _cairo_traps_to_boxes (&info->traps, info->antialias, &boxes))
return CAIRO_INT_STATUS_UNSUPPORTED;
return clip_and_composite_boxes (compositor, extents, &boxes);
}
static cairo_int_status_t
clip_and_composite_traps (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
composite_traps_info_t *info,
unsigned flags)
{
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = trim_extents_to_traps (extents, &info->traps);
if (unlikely (status != CAIRO_INT_STATUS_SUCCESS))
return status;
status = CAIRO_INT_STATUS_UNSUPPORTED;
if ((flags & FORCE_CLIP_REGION) == 0)
status = composite_traps_as_boxes (compositor, extents, info);
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
/* For unbounded operations, the X11 server will estimate the
* affected rectangle and apply the operation to that. However,
* there are cases where this is an overestimate (e.g. the
* clip-fill-{eo,nz}-unbounded test).
*
* The clip will trim that overestimate to our expectations.
*/
if (! extents->is_bounded)
flags |= FORCE_CLIP_REGION;
status = clip_and_composite (compositor, extents,
composite_traps, NULL, info,
need_unbounded_clip (extents) | flags);
}
return status;
}
static cairo_int_status_t
clip_and_composite_tristrip (const cairo_traps_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
composite_tristrip_info_t *info)
{
cairo_int_status_t status;
unsigned int flags = 0;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = trim_extents_to_tristrip (extents, &info->strip);
if (unlikely (status != CAIRO_INT_STATUS_SUCCESS))
return status;
if (! extents->is_bounded)
flags |= FORCE_CLIP_REGION;
status = clip_and_composite (compositor, extents,
composite_tristrip, NULL, info,
need_unbounded_clip (extents) | flags);
return status;
}
struct composite_mask {
cairo_surface_t *mask;
int mask_x, mask_y;
};
static cairo_int_status_t
composite_mask (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x,
int src_y,
int dst_x,
int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
struct composite_mask *data = closure;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (src != NULL) {
compositor->composite (dst, op, src, data->mask,
extents->x + src_x, extents->y + src_y,
extents->x + data->mask_x, extents->y + data->mask_y,
extents->x - dst_x, extents->y - dst_y,
extents->width, extents->height);
} else {
compositor->composite (dst, op, data->mask, NULL,
extents->x + data->mask_x, extents->y + data->mask_y,
0, 0,
extents->x - dst_x, extents->y - dst_y,
extents->width, extents->height);
}
return CAIRO_STATUS_SUCCESS;
}
struct composite_box_info {
const cairo_traps_compositor_t *compositor;
cairo_surface_t *dst;
cairo_surface_t *src;
int src_x, src_y;
uint8_t op;
};
static void composite_box(void *closure,
int16_t x, int16_t y,
int16_t w, int16_t h,
uint16_t coverage)
{
struct composite_box_info *info = closure;
const cairo_traps_compositor_t *compositor = info->compositor;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (! CAIRO_ALPHA_SHORT_IS_OPAQUE (coverage)) {
cairo_surface_t *mask;
cairo_color_t color;
cairo_solid_pattern_t solid;
int mask_x, mask_y;
_cairo_color_init_rgba (&color, 0, 0, 0, coverage / (double)0xffff);
_cairo_pattern_init_solid (&solid, &color);
mask = compositor->pattern_to_surface (info->dst, &solid.base, FALSE,
&_cairo_unbounded_rectangle,
&_cairo_unbounded_rectangle,
&mask_x, &mask_y);
if (likely (mask->status == CAIRO_STATUS_SUCCESS)) {
compositor->composite (info->dst, info->op, info->src, mask,
x + info->src_x, y + info->src_y,
mask_x, mask_y,
x, y,
w, h);
}
cairo_surface_destroy (mask);
} else {
compositor->composite (info->dst, info->op, info->src, NULL,
x + info->src_x, y + info->src_y,
0, 0,
x, y,
w, h);
}
}
static cairo_int_status_t
composite_mask_clip_boxes (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x,
int src_y,
int dst_x,
int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
struct composite_mask *data = closure;
struct composite_box_info info;
int i;
TRACE ((stderr, "%s\n", __FUNCTION__));
info.compositor = compositor;
info.op = CAIRO_OPERATOR_SOURCE;
info.dst = dst;
info.src = data->mask;
info.src_x = data->mask_x;
info.src_y = data->mask_y;
info.src_x += dst_x;
info.src_y += dst_y;
for (i = 0; i < clip->num_boxes; i++)
do_unaligned_box(composite_box, &info, &clip->boxes[i], dst_x, dst_y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
composite_mask_clip (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x,
int src_y,
int dst_x,
int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
struct composite_mask *data = closure;
cairo_polygon_t polygon;
cairo_fill_rule_t fill_rule;
composite_traps_info_t info;
cairo_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = _cairo_clip_get_polygon (clip, &polygon,
&fill_rule, &info.antialias);
if (unlikely (status))
return status;
_cairo_traps_init (&info.traps);
status = _cairo_bentley_ottmann_tessellate_polygon (&info.traps,
&polygon,
fill_rule);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
return status;
status = composite_traps (compositor, dst, &info,
CAIRO_OPERATOR_SOURCE,
data->mask,
data->mask_x + dst_x, data->mask_y + dst_y,
dst_x, dst_y,
extents, NULL);
_cairo_traps_fini (&info.traps);
return status;
}
/* high-level compositor interface */
static cairo_int_status_t
_cairo_traps_compositor_paint (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents)
{
cairo_traps_compositor_t *compositor = (cairo_traps_compositor_t*)_compositor;
cairo_boxes_t boxes;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = compositor->check_composite (extents);
if (unlikely (status))
return status;
_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_traps_compositor_mask (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents)
{
const cairo_traps_compositor_t *compositor = (cairo_traps_compositor_t*)_compositor;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = compositor->check_composite (extents);
if (unlikely (status))
return status;
if (extents->mask_pattern.base.type == CAIRO_PATTERN_TYPE_SOLID &&
extents->clip->path == NULL) {
status = clip_and_composite (compositor, extents,
composite_opacity_boxes,
composite_opacity_boxes,
&extents->mask_pattern,
need_unbounded_clip (extents));
} else {
struct composite_mask data;
data.mask = compositor->pattern_to_surface (extents->surface,
&extents->mask_pattern.base,
TRUE,
&extents->bounded,
&extents->mask_sample_area,
&data.mask_x,
&data.mask_y);
if (unlikely (data.mask->status))
return data.mask->status;
status = clip_and_composite (compositor, extents,
composite_mask,
extents->clip->path ? composite_mask_clip : composite_mask_clip_boxes,
&data, need_bounded_clip (extents));
cairo_surface_destroy (data.mask);
}
return status;
}
static cairo_int_status_t
_cairo_traps_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_traps_compositor_t *compositor = (cairo_traps_compositor_t *)_compositor;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = compositor->check_composite (extents);
if (unlikely (status))
return status;
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (_cairo_path_fixed_stroke_is_rectilinear (path)) {
cairo_boxes_t boxes;
_cairo_boxes_init_with_clip (&boxes, extents->clip);
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 && 0 &&
_cairo_clip_is_region (extents->clip)) /* XXX */
{
composite_tristrip_info_t info;
info.antialias = antialias;
_cairo_tristrip_init_with_clip (&info.strip, extents->clip);
status = _cairo_path_fixed_stroke_to_tristrip (path, style,
ctm, ctm_inverse,
tolerance,
&info.strip);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = clip_and_composite_tristrip (compositor, extents, &info);
_cairo_tristrip_fini (&info.strip);
}
if (status == CAIRO_INT_STATUS_UNSUPPORTED &&
path->has_curve_to && antialias == CAIRO_ANTIALIAS_NONE) {
cairo_polygon_t polygon;
_cairo_polygon_init_with_clip (&polygon, extents->clip);
status = _cairo_path_fixed_stroke_to_polygon (path, style,
ctm, ctm_inverse,
tolerance,
&polygon);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = clip_and_composite_polygon (compositor,
extents, &polygon,
CAIRO_ANTIALIAS_NONE,
CAIRO_FILL_RULE_WINDING,
TRUE);
_cairo_polygon_fini (&polygon);
}
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
cairo_int_status_t (*func) (const 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_traps_t *traps);
composite_traps_info_t info;
unsigned flags;
if (antialias == CAIRO_ANTIALIAS_BEST || antialias == CAIRO_ANTIALIAS_GOOD) {
func = _cairo_path_fixed_stroke_polygon_to_traps;
flags = 0;
} else {
func = _cairo_path_fixed_stroke_to_traps;
flags = need_bounded_clip (extents) & ~NEED_CLIP_SURFACE;
}
info.antialias = antialias;
_cairo_traps_init_with_clip (&info.traps, extents->clip);
status = func (path, style, ctm, ctm_inverse, tolerance, &info.traps);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = clip_and_composite_traps (compositor, extents, &info, flags);
_cairo_traps_fini (&info.traps);
}
return status;
}
static cairo_int_status_t
_cairo_traps_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_traps_compositor_t *compositor = (cairo_traps_compositor_t *)_compositor;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = compositor->check_composite (extents);
if (unlikely (status))
return status;
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (_cairo_path_fixed_fill_is_rectilinear (path)) {
cairo_boxes_t boxes;
_cairo_boxes_init_with_clip (&boxes, extents->clip);
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;
#if 0
if (extents->mask.width > extents->unbounded.width ||
extents->mask.height > extents->unbounded.height)
{
cairo_box_t limits;
_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);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
status = _cairo_polygon_intersect_with_boxes (&polygon, &fill_rule,
extents->clip->boxes,
extents->clip->num_boxes);
}
#else
_cairo_polygon_init_with_clip (&polygon, extents->clip);
status = _cairo_path_fixed_fill_to_polygon (path, tolerance, &polygon);
#endif
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
status = clip_and_composite_polygon (compositor, extents, &polygon,
antialias, fill_rule, path->has_curve_to);
}
_cairo_polygon_fini (&polygon);
}
return status;
}
static cairo_int_status_t
composite_glyphs (const cairo_traps_compositor_t *compositor,
cairo_surface_t *dst,
void *closure,
cairo_operator_t op,
cairo_surface_t *src,
int src_x, int src_y,
int dst_x, int dst_y,
const cairo_rectangle_int_t *extents,
cairo_clip_t *clip)
{
cairo_composite_glyphs_info_t *info = closure;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (op == CAIRO_OPERATOR_ADD && (dst->content & CAIRO_CONTENT_COLOR) == 0)
info->use_mask = 0;
return compositor->composite_glyphs (dst, op, src,
src_x, src_y,
dst_x, dst_y,
info);
}
static cairo_int_status_t
_cairo_traps_compositor_glyphs (const cairo_compositor_t *_compositor,
cairo_composite_rectangles_t *extents,
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_bool_t overlap)
{
const cairo_traps_compositor_t *compositor = (cairo_traps_compositor_t *)_compositor;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = compositor->check_composite (extents);
if (unlikely (status))
return status;
_cairo_scaled_font_freeze_cache (scaled_font);
status = compositor->check_composite_glyphs (extents,
scaled_font, glyphs,
&num_glyphs);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_composite_glyphs_info_t info;
info.font = scaled_font;
info.glyphs = glyphs;
info.num_glyphs = num_glyphs;
info.use_mask = overlap || ! extents->is_bounded;
info.extents = extents->bounded;
status = clip_and_composite (compositor, extents,
composite_glyphs, NULL, &info,
need_bounded_clip (extents) | FORCE_CLIP_REGION);
}
_cairo_scaled_font_thaw_cache (scaled_font);
return status;
}
void
_cairo_traps_compositor_init (cairo_traps_compositor_t *compositor,
const cairo_compositor_t *delegate)
{
compositor->base.delegate = delegate;
compositor->base.paint = _cairo_traps_compositor_paint;
compositor->base.mask = _cairo_traps_compositor_mask;
compositor->base.fill = _cairo_traps_compositor_fill;
compositor->base.stroke = _cairo_traps_compositor_stroke;
compositor->base.glyphs = _cairo_traps_compositor_glyphs;
}