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cairo/src/cairo-meta-surface.c

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/* cairo - a vector graphics library with display and print output
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 Red Hat, Inc.
*
* Contributor(s):
* Kristian Høgsberg <krh@redhat.com>
*/
#include "cairoint.h"
#include "cairo-meta-surface-private.h"
#include "cairo-clip-private.h"
static const cairo_surface_backend_t cairo_meta_surface_backend;
cairo_surface_t *
_cairo_meta_surface_create (double width, double height)
{
cairo_meta_surface_t *meta;
meta = malloc (sizeof (cairo_meta_surface_t));
if (meta == NULL) {
_cairo_error (CAIRO_STATUS_NO_MEMORY);
return (cairo_surface_t*) &_cairo_surface_nil;
}
meta->width = width;
meta->height = height;
_cairo_surface_init (&meta->base, &cairo_meta_surface_backend);
_cairo_array_init (&meta->commands, sizeof (cairo_command_t *));
return &meta->base;
}
static cairo_surface_t *
_cairo_meta_surface_create_similar (void *abstract_surface,
cairo_content_t content,
int width,
int height)
{
return _cairo_meta_surface_create (width, height);
}
static cairo_status_t
_cairo_meta_surface_finish (void *abstract_surface)
{
cairo_meta_surface_t *meta = abstract_surface;
cairo_command_t *command;
cairo_command_t **elements;
int i, num_elements;
num_elements = meta->commands.num_elements;
elements = (cairo_command_t **) meta->commands.elements;
for (i = 0; i < num_elements; i++) {
command = elements[i];
switch (command->type) {
case CAIRO_COMMAND_COMPOSITE:
_cairo_pattern_fini (&command->composite.src_pattern.base);
if (command->composite.mask_pattern_pointer)
_cairo_pattern_fini (command->composite.mask_pattern_pointer);
free (command);
break;
case CAIRO_COMMAND_FILL_RECTANGLES:
free (command->fill_rectangles.rects);
free (command);
break;
case CAIRO_COMMAND_COMPOSITE_TRAPEZOIDS:
_cairo_pattern_fini (&command->composite_trapezoids.pattern.base);
free (command->composite_trapezoids.traps);
free (command);
break;
case CAIRO_COMMAND_INTERSECT_CLIP_PATH:
if (command->intersect_clip_path.path_pointer)
_cairo_path_fixed_fini (&command->intersect_clip_path.path);
free (command);
break;
case CAIRO_COMMAND_SHOW_GLYPHS:
cairo_scaled_font_destroy (command->show_glyphs.scaled_font);
_cairo_pattern_fini (&command->show_glyphs.pattern.base);
free (command->show_glyphs.glyphs);
free (command);
break;
case CAIRO_COMMAND_FILL:
_cairo_pattern_fini (&command->fill.pattern.base);
_cairo_path_fixed_fini (&command->fill.path);
free (command);
break;
default:
ASSERT_NOT_REACHED;
}
}
_cairo_array_fini (&meta->commands);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_init_pattern_with_snapshot (cairo_pattern_t *pattern,
const cairo_pattern_t *other)
{
cairo_status_t status;
_cairo_pattern_init_copy (pattern, other);
if (pattern->type == CAIRO_PATTERN_SURFACE) {
cairo_surface_pattern_t *surface_pattern = (cairo_surface_pattern_t *) pattern;
cairo_surface_t *surface = surface_pattern->surface;
surface_pattern->surface = _cairo_surface_snapshot (surface);
cairo_surface_destroy (surface);
if (status)
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_meta_surface_composite (cairo_operator_t operator,
cairo_pattern_t *src_pattern,
cairo_pattern_t *mask_pattern,
void *abstract_surface,
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_status_t status;
cairo_meta_surface_t *meta = abstract_surface;
cairo_command_composite_t *command;
command = malloc (sizeof (cairo_command_composite_t));
if (command == NULL)
return CAIRO_STATUS_NO_MEMORY;
command->type = CAIRO_COMMAND_COMPOSITE;
command->operator = operator;
status = _init_pattern_with_snapshot (&command->src_pattern.base, src_pattern);
if (status)
goto CLEANUP_COMMAND;
if (mask_pattern) {
status = _init_pattern_with_snapshot (&command->mask_pattern.base, mask_pattern);
if (status)
goto CLEANUP_SOURCE;
command->mask_pattern_pointer = &command->mask_pattern.base;
} else {
command->mask_pattern_pointer = NULL;
}
command->src_x = src_x;
command->src_y = src_y;
command->mask_x = mask_x;
command->mask_y = mask_y;
command->dst_x = dst_x;
command->dst_y = dst_y;
command->width = width;
command->height = height;
status = _cairo_array_append (&meta->commands, &command);
if (status)
goto CLEANUP_MASK;
return CAIRO_STATUS_SUCCESS;
CLEANUP_MASK:
_cairo_pattern_fini (command->mask_pattern_pointer);
CLEANUP_SOURCE:
_cairo_pattern_fini (&command->src_pattern.base);
CLEANUP_COMMAND:
free (command);
return status;
}
static cairo_int_status_t
_cairo_meta_surface_fill_rectangles (void *abstract_surface,
cairo_operator_t operator,
const cairo_color_t *color,
cairo_rectangle_t *rects,
int num_rects)
{
cairo_status_t status;
cairo_meta_surface_t *meta = abstract_surface;
cairo_command_fill_rectangles_t *command;
command = malloc (sizeof (cairo_command_fill_rectangles_t));
if (command == NULL)
return CAIRO_STATUS_NO_MEMORY;
command->type = CAIRO_COMMAND_FILL_RECTANGLES;
command->operator = operator;
command->color = *color;
command->rects = malloc (sizeof (cairo_rectangle_t) * num_rects);
if (command->rects == NULL) {
free (command);
return CAIRO_STATUS_NO_MEMORY;
}
memcpy (command->rects, rects, sizeof (cairo_rectangle_t) * num_rects);
command->num_rects = num_rects;
status = _cairo_array_append (&meta->commands, &command);
if (status) {
free (command->rects);
free (command);
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_meta_surface_composite_trapezoids (cairo_operator_t operator,
cairo_pattern_t *pattern,
void *abstract_surface,
cairo_antialias_t antialias,
int x_src,
int y_src,
int x_dst,
int y_dst,
unsigned int width,
unsigned int height,
cairo_trapezoid_t *traps,
int num_traps)
{
cairo_status_t status;
cairo_meta_surface_t *meta = abstract_surface;
cairo_command_composite_trapezoids_t *command;
command = malloc (sizeof (cairo_command_composite_trapezoids_t));
if (command == NULL)
return CAIRO_STATUS_NO_MEMORY;
command->type = CAIRO_COMMAND_COMPOSITE_TRAPEZOIDS;
command->operator = operator;
_init_pattern_with_snapshot (&command->pattern.base, pattern);
command->antialias = antialias;
command->x_src = x_src;
command->y_src = y_src;
command->x_dst = x_dst;
command->y_dst = y_dst;
command->width = width;
command->height = height;
command->traps = malloc (sizeof (cairo_trapezoid_t) * num_traps);
if (command->traps == NULL) {
_cairo_pattern_fini (&command->pattern.base);
free (command);
return CAIRO_STATUS_NO_MEMORY;
}
memcpy (command->traps, traps, sizeof (cairo_trapezoid_t) * num_traps);
command->num_traps = num_traps;
status = _cairo_array_append (&meta->commands, &command);
if (status) {
_cairo_pattern_fini (&command->pattern.base);
free (command->traps);
free (command);
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_meta_surface_intersect_clip_path (void *dst,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_meta_surface_t *meta = dst;
cairo_command_intersect_clip_path_t *command;
cairo_status_t status;
command = malloc (sizeof (cairo_command_intersect_clip_path_t));
if (command == NULL)
return CAIRO_STATUS_NO_MEMORY;
command->type = CAIRO_COMMAND_INTERSECT_CLIP_PATH;
if (path) {
status = _cairo_path_fixed_init_copy (&command->path, path);
if (status) {
free (command);
return status;
}
command->path_pointer = &command->path;
} else {
command->path_pointer = NULL;
}
command->fill_rule = fill_rule;
command->tolerance = tolerance;
command->antialias = antialias;
status = _cairo_array_append (&meta->commands, &command);
if (status) {
if (path)
_cairo_path_fixed_fini (&command->path);
free (command);
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_meta_surface_get_extents (void *abstract_surface,
cairo_rectangle_t *rectangle)
{
cairo_meta_surface_t *meta = abstract_surface;
/* Currently this is used for getting the extents of the surface
* before calling cairo_paint(). This is the only this that
* requires the meta surface to have an explicit size. If paint
* was just a backend function, this would not be necessary. */
rectangle->x = 0;
rectangle->y = 0;
rectangle->width = meta->width;
rectangle->height = meta->height;
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_meta_surface_old_show_glyphs (cairo_scaled_font_t *scaled_font,
cairo_operator_t operator,
cairo_pattern_t *pattern,
void *abstract_surface,
int source_x,
int source_y,
int dest_x,
int dest_y,
unsigned int width,
unsigned int height,
const cairo_glyph_t *glyphs,
int num_glyphs)
{
cairo_status_t status;
cairo_meta_surface_t *meta = abstract_surface;
cairo_command_show_glyphs_t *command;
command = malloc (sizeof (cairo_command_show_glyphs_t));
if (command == NULL)
return CAIRO_STATUS_NO_MEMORY;
command->type = CAIRO_COMMAND_SHOW_GLYPHS;
command->scaled_font = cairo_scaled_font_reference (scaled_font);
command->operator = operator;
_init_pattern_with_snapshot (&command->pattern.base, pattern);
command->source_x = source_x;
command->source_y = source_y;
command->dest_x = dest_x;
command->dest_y = dest_y;
command->width = width;
command->height = height;
command->glyphs = malloc (sizeof (cairo_glyph_t) * num_glyphs);
if (command->glyphs == NULL) {
_cairo_pattern_fini (&command->pattern.base);
free (command);
return CAIRO_STATUS_NO_MEMORY;
}
memcpy (command->glyphs, glyphs, sizeof (cairo_glyph_t) * num_glyphs);
command->num_glyphs = num_glyphs;
status = _cairo_array_append (&meta->commands, &command);
if (status) {
_cairo_pattern_fini (&command->pattern.base);
free (command->glyphs);
free (command);
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_meta_surface_fill (void *abstract_surface,
cairo_operator_t operator,
cairo_pattern_t *pattern,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_meta_surface_t *meta = abstract_surface;
cairo_command_fill_t *command;
cairo_status_t status;
command = malloc (sizeof (cairo_command_fill_t));
if (command == NULL)
return CAIRO_STATUS_NO_MEMORY;
command->type = CAIRO_COMMAND_FILL;
command->operator = operator;
_init_pattern_with_snapshot (&command->pattern.base, pattern);
status = _cairo_path_fixed_init_copy (&command->path, path);
if (status) {
_cairo_pattern_fini (&command->pattern.base);
free (command);
return CAIRO_STATUS_NO_MEMORY;
}
command->fill_rule = fill_rule;
command->tolerance = tolerance;
command->antialias = antialias;
status = _cairo_array_append (&meta->commands, &command);
if (status) {
_cairo_path_fixed_fini (&command->path);
_cairo_pattern_fini (&command->pattern.base);
free (command);
return status;
}
return CAIRO_STATUS_SUCCESS;
}
/**
* _cairo_surface_is_meta:
* @surface: a #cairo_surface_t
*
* Checks if a surface is a #cairo_meta_surface_t
*
* Return value: TRUE if the surface is a meta surface
**/
cairo_bool_t
_cairo_surface_is_meta (const cairo_surface_t *surface)
{
return surface->backend == &cairo_meta_surface_backend;
}
static const cairo_surface_backend_t cairo_meta_surface_backend = {
_cairo_meta_surface_create_similar,
_cairo_meta_surface_finish,
NULL, /* acquire_source_image */
NULL, /* release_source_image */
NULL, /* acquire_dest_image */
NULL, /* release_dest_image */
NULL, /* clone_similar */
_cairo_meta_surface_composite,
_cairo_meta_surface_fill_rectangles,
_cairo_meta_surface_composite_trapezoids,
NULL, /* copy_page */
NULL, /* show_page */
NULL, /* set_clip_region */
_cairo_meta_surface_intersect_clip_path,
_cairo_meta_surface_get_extents,
_cairo_meta_surface_old_show_glyphs,
NULL, /* get_font_options */
NULL, /* flush */
NULL, /* mark_dirty_rectangle */
NULL, /* scaled_font_fini */
NULL, /* scaled_glyph_fini */
/* Here are the drawing functions, (which are in some sense the
* only things that cairo_meta_surface should need to
* implement). */
NULL, /* paint */
NULL, /* mask */
NULL, /* stroke */
_cairo_meta_surface_fill,
NULL /* show_glyphs */
};
cairo_int_status_t
_cairo_meta_surface_replay (cairo_surface_t *surface,
cairo_surface_t *target)
{
cairo_meta_surface_t *meta;
cairo_command_t *command, **elements;
int i, num_elements;
cairo_int_status_t status;
cairo_traps_t traps;
cairo_clip_t clip;
meta = (cairo_meta_surface_t *) surface;
status = CAIRO_STATUS_SUCCESS;
_cairo_clip_init (&clip, target);
num_elements = meta->commands.num_elements;
elements = (cairo_command_t **) meta->commands.elements;
for (i = 0; i < num_elements; i++) {
command = elements[i];
switch (command->type) {
case CAIRO_COMMAND_COMPOSITE:
status = _cairo_surface_set_clip (target, &clip);
if (status)
break;
status = _cairo_surface_composite
(command->composite.operator,
&command->composite.src_pattern.base,
command->composite.mask_pattern_pointer,
target,
command->composite.src_x,
command->composite.src_y,
command->composite.mask_x,
command->composite.mask_y,
command->composite.dst_x,
command->composite.dst_y,
command->composite.width,
command->composite.height);
break;
case CAIRO_COMMAND_FILL_RECTANGLES:
status = _cairo_surface_set_clip (target, &clip);
if (status)
break;
status = _cairo_surface_fill_rectangles
(target,
command->fill_rectangles.operator,
&command->fill_rectangles.color,
command->fill_rectangles.rects,
command->fill_rectangles.num_rects);
break;
case CAIRO_COMMAND_COMPOSITE_TRAPEZOIDS:
status = _cairo_surface_set_clip (target, &clip);
if (status)
break;
status = _cairo_surface_composite_trapezoids
(command->composite_trapezoids.operator,
&command->composite_trapezoids.pattern.base,
target,
command->composite_trapezoids.antialias,
command->composite_trapezoids.x_src,
command->composite_trapezoids.y_src,
command->composite_trapezoids.x_dst,
command->composite_trapezoids.y_dst,
command->composite_trapezoids.width,
command->composite_trapezoids.height,
command->composite_trapezoids.traps,
command->composite_trapezoids.num_traps);
break;
case CAIRO_COMMAND_INTERSECT_CLIP_PATH:
/* XXX Meta surface clipping is broken and requires some
* cairo-gstate.c rewriting. Work around it for now. */
if (command->intersect_clip_path.path_pointer == NULL)
status = _cairo_clip_reset (&clip);
else
status = _cairo_clip_clip (&clip,
command->intersect_clip_path.path_pointer,
command->intersect_clip_path.fill_rule,
command->intersect_clip_path.tolerance,
command->intersect_clip_path.antialias,
target);
break;
case CAIRO_COMMAND_SHOW_GLYPHS:
status = _cairo_surface_set_clip (target, &clip);
if (status)
break;
status = _cairo_surface_old_show_glyphs
(command->show_glyphs.scaled_font,
command->show_glyphs.operator,
&command->show_glyphs.pattern.base,
target,
command->show_glyphs.source_x,
command->show_glyphs.source_y,
command->show_glyphs.dest_x,
command->show_glyphs.dest_y,
command->show_glyphs.width,
command->show_glyphs.height,
command->show_glyphs.glyphs,
command->show_glyphs.num_glyphs);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
break;
status = (*command->show_glyphs.scaled_font->backend->
show_glyphs) (command->show_glyphs.scaled_font,
command->show_glyphs.operator,
&command->show_glyphs.pattern.base,
target,
command->show_glyphs.source_x,
command->show_glyphs.source_y,
command->show_glyphs.dest_x,
command->show_glyphs.dest_y,
command->show_glyphs.width,
command->show_glyphs.height,
command->show_glyphs.glyphs,
command->show_glyphs.num_glyphs);
break;
case CAIRO_COMMAND_FILL:
status = _cairo_surface_set_clip (target, &clip);
if (status)
break;
status = _cairo_surface_fill (target,
command->fill.operator,
&command->fill.pattern.base,
&command->fill.path,
command->fill.fill_rule,
command->fill.tolerance,
command->fill.antialias);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
break;
_cairo_traps_init (&traps);
status = _cairo_path_fixed_fill_to_traps (&command->fill.path,
command->fill.fill_rule,
command->fill.tolerance,
&traps);
if (status) {
_cairo_traps_fini (&traps);
break;
}
status = _cairo_surface_clip_and_composite_trapezoids (&command->fill.pattern.base,
command->fill.operator,
target,
&traps,
&clip,
command->fill.antialias);
_cairo_traps_fini (&traps);
break;
default:
ASSERT_NOT_REACHED;
}
if (status)
break;
}
_cairo_clip_fini (&clip);
return status;
}
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