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kolibrios-fun/contrib/sdk/sources/cairo/src/cairo-analysis-surface.c
Sergey Semyonov (Serge) 754f9336f0 upload sdk 
git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60
2013-12-15 08:09:20 +00:00

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/*
* Copyright © 2006 Keith Packard
* Copyright © 2007 Adrian Johnson
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Keith Packard
*
* Contributor(s):
* Keith Packard <keithp@keithp.com>
* Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairoint.h"
#include "cairo-analysis-surface-private.h"
#include "cairo-box-inline.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-paginated-private.h"
#include "cairo-recording-surface-inline.h"
#include "cairo-surface-snapshot-inline.h"
#include "cairo-surface-subsurface-inline.h"
#include "cairo-region-private.h"
typedef struct {
cairo_surface_t base;
cairo_surface_t *target;
cairo_bool_t first_op;
cairo_bool_t has_supported;
cairo_bool_t has_unsupported;
cairo_region_t supported_region;
cairo_region_t fallback_region;
cairo_box_t page_bbox;
cairo_bool_t has_ctm;
cairo_matrix_t ctm;
} cairo_analysis_surface_t;
cairo_int_status_t
_cairo_analysis_surface_merge_status (cairo_int_status_t status_a,
cairo_int_status_t status_b)
{
/* fatal errors should be checked and propagated at source */
assert (! _cairo_int_status_is_error (status_a));
assert (! _cairo_int_status_is_error (status_b));
/* return the most important status */
if (status_a == CAIRO_INT_STATUS_UNSUPPORTED ||
status_b == CAIRO_INT_STATUS_UNSUPPORTED)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (status_a == CAIRO_INT_STATUS_IMAGE_FALLBACK ||
status_b == CAIRO_INT_STATUS_IMAGE_FALLBACK)
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
if (status_a == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN ||
status_b == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
return CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN;
if (status_a == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY ||
status_b == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY)
return CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY;
/* at this point we have checked all the valid internal codes, so... */
assert (status_a == CAIRO_INT_STATUS_SUCCESS &&
status_b == CAIRO_INT_STATUS_SUCCESS);
return CAIRO_INT_STATUS_SUCCESS;
}
struct proxy {
cairo_surface_t base;
cairo_surface_t *target;
};
static cairo_status_t
proxy_finish (void *abstract_surface)
{
return CAIRO_STATUS_SUCCESS;
}
static const cairo_surface_backend_t proxy_backend = {
CAIRO_INTERNAL_SURFACE_TYPE_NULL,
proxy_finish,
};
static cairo_surface_t *
attach_proxy (cairo_surface_t *source,
cairo_surface_t *target)
{
struct proxy *proxy;
proxy = malloc (sizeof (*proxy));
if (unlikely (proxy == NULL))
return _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);
_cairo_surface_init (&proxy->base, &proxy_backend, NULL, target->content);
proxy->target = target;
_cairo_surface_attach_snapshot (source, &proxy->base, NULL);
return &proxy->base;
}
static void
detach_proxy (cairo_surface_t *proxy)
{
cairo_surface_finish (proxy);
cairo_surface_destroy (proxy);
}
static cairo_int_status_t
_analyze_recording_surface_pattern (cairo_analysis_surface_t *surface,
const cairo_pattern_t *pattern)
{
const cairo_surface_pattern_t *surface_pattern;
cairo_analysis_surface_t *tmp;
cairo_surface_t *source, *proxy;
cairo_matrix_t p2d;
cairo_status_t status, analysis_status;
assert (pattern->type == CAIRO_PATTERN_TYPE_SURFACE);
surface_pattern = (const cairo_surface_pattern_t *) pattern;
assert (surface_pattern->surface->type == CAIRO_SURFACE_TYPE_RECORDING);
source = surface_pattern->surface;
proxy = _cairo_surface_has_snapshot (source, &proxy_backend);
if (proxy != NULL) {
/* nothing untoward found so far */
return CAIRO_STATUS_SUCCESS;
}
tmp = (cairo_analysis_surface_t *)
_cairo_analysis_surface_create (surface->target);
if (unlikely (tmp->base.status))
return tmp->base.status;
proxy = attach_proxy (source, &tmp->base);
p2d = pattern->matrix;
status = cairo_matrix_invert (&p2d);
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_multiply (&tmp->ctm, &p2d, &surface->ctm);
tmp->has_ctm = ! _cairo_matrix_is_identity (&tmp->ctm);
source = _cairo_surface_get_source (source, NULL);
status = _cairo_recording_surface_replay_and_create_regions (source,
&tmp->base);
analysis_status = tmp->has_unsupported ? CAIRO_INT_STATUS_IMAGE_FALLBACK : CAIRO_INT_STATUS_SUCCESS;
detach_proxy (proxy);
cairo_surface_destroy (&tmp->base);
if (unlikely (status))
return status;
return analysis_status;
}
static cairo_int_status_t
_add_operation (cairo_analysis_surface_t *surface,
cairo_rectangle_int_t *rect,
cairo_int_status_t backend_status)
{
cairo_int_status_t status;
cairo_box_t bbox;
if (rect->width == 0 || rect->height == 0) {
/* Even though the operation is not visible we must be careful
* to not allow unsupported operations to be replayed to the
* backend during CAIRO_PAGINATED_MODE_RENDER */
if (backend_status == CAIRO_INT_STATUS_SUCCESS ||
backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY ||
backend_status == CAIRO_INT_STATUS_NOTHING_TO_DO)
{
return CAIRO_INT_STATUS_SUCCESS;
}
else
{
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
}
}
_cairo_box_from_rectangle (&bbox, rect);
if (surface->has_ctm) {
int tx, ty;
if (_cairo_matrix_is_integer_translation (&surface->ctm, &tx, &ty)) {
rect->x += tx;
rect->y += ty;
tx = _cairo_fixed_from_int (tx);
bbox.p1.x += tx;
bbox.p2.x += tx;
ty = _cairo_fixed_from_int (ty);
bbox.p1.y += ty;
bbox.p2.y += ty;
} else {
_cairo_matrix_transform_bounding_box_fixed (&surface->ctm,
&bbox, NULL);
if (bbox.p1.x == bbox.p2.x || bbox.p1.y == bbox.p2.y) {
/* Even though the operation is not visible we must be
* careful to not allow unsupported operations to be
* replayed to the backend during
* CAIRO_PAGINATED_MODE_RENDER */
if (backend_status == CAIRO_INT_STATUS_SUCCESS ||
backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY ||
backend_status == CAIRO_INT_STATUS_NOTHING_TO_DO)
{
return CAIRO_INT_STATUS_SUCCESS;
}
else
{
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
}
}
_cairo_box_round_to_rectangle (&bbox, rect);
}
}
if (surface->first_op) {
surface->first_op = FALSE;
surface->page_bbox = bbox;
} else
_cairo_box_add_box(&surface->page_bbox, &bbox);
/* If the operation is completely enclosed within the fallback
* region there is no benefit in emitting a native operation as
* the fallback image will be painted on top.
*/
if (cairo_region_contains_rectangle (&surface->fallback_region, rect) == CAIRO_REGION_OVERLAP_IN)
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
if (backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY) {
/* A status of CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY indicates
* that the backend only supports this operation if the
* transparency removed. If the extents of this operation does
* not intersect any other native operation, the operation is
* natively supported and the backend will blend the
* transparency into the white background.
*/
if (cairo_region_contains_rectangle (&surface->supported_region, rect) == CAIRO_REGION_OVERLAP_OUT)
backend_status = CAIRO_INT_STATUS_SUCCESS;
}
if (backend_status == CAIRO_INT_STATUS_SUCCESS) {
/* Add the operation to the supported region. Operations in
* this region will be emitted as native operations.
*/
surface->has_supported = TRUE;
return cairo_region_union_rectangle (&surface->supported_region, rect);
}
/* Add the operation to the unsupported region. This region will
* be painted as an image after all native operations have been
* emitted.
*/
surface->has_unsupported = TRUE;
status = cairo_region_union_rectangle (&surface->fallback_region, rect);
/* The status CAIRO_INT_STATUS_IMAGE_FALLBACK is used to indicate
* unsupported operations to the recording surface as using
* CAIRO_INT_STATUS_UNSUPPORTED would cause cairo-surface to
* invoke the cairo-surface-fallback path then return
* CAIRO_STATUS_SUCCESS.
*/
if (status == CAIRO_INT_STATUS_SUCCESS)
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
else
return status;
}
static cairo_status_t
_cairo_analysis_surface_finish (void *abstract_surface)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
_cairo_region_fini (&surface->supported_region);
_cairo_region_fini (&surface->fallback_region);
cairo_surface_destroy (surface->target);
return CAIRO_STATUS_SUCCESS;
}
static cairo_bool_t
_cairo_analysis_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_analysis_surface_t *surface = abstract_surface;
return _cairo_surface_get_extents (surface->target, rectangle);
}
static void
_rectangle_intersect_clip (cairo_rectangle_int_t *extents, const cairo_clip_t *clip)
{
if (clip != NULL)
_cairo_rectangle_intersect (extents, _cairo_clip_get_extents (clip));
}
static void
_cairo_analysis_surface_operation_extents (cairo_analysis_surface_t *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip,
cairo_rectangle_int_t *extents)
{
cairo_bool_t is_empty;
is_empty = _cairo_surface_get_extents (&surface->base, extents);
if (_cairo_operator_bounded_by_source (op)) {
cairo_rectangle_int_t source_extents;
_cairo_pattern_get_extents (source, &source_extents);
_cairo_rectangle_intersect (extents, &source_extents);
}
_rectangle_intersect_clip (extents, clip);
}
static cairo_int_status_t
_cairo_analysis_surface_paint (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t backend_status;
cairo_rectangle_int_t extents;
if (surface->target->backend->paint == NULL) {
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
} else {
backend_status =
surface->target->backend->paint (surface->target,
op, source, clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
backend_status = _analyze_recording_surface_pattern (surface, source);
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
return _add_operation (surface, &extents, backend_status);
}
static cairo_int_status_t
_cairo_analysis_surface_mask (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
const cairo_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t backend_status;
cairo_rectangle_int_t extents;
if (surface->target->backend->mask == NULL) {
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
} else {
backend_status =
surface->target->backend->mask (surface->target,
op, source, mask, clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN) {
cairo_int_status_t backend_source_status = CAIRO_STATUS_SUCCESS;
cairo_int_status_t backend_mask_status = CAIRO_STATUS_SUCCESS;
if (source->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_t *src_surface = ((cairo_surface_pattern_t *)source)->surface;
src_surface = _cairo_surface_get_source (src_surface, NULL);
if (_cairo_surface_is_recording (src_surface)) {
backend_source_status =
_analyze_recording_surface_pattern (surface, source);
if (_cairo_int_status_is_error (backend_source_status))
return backend_source_status;
}
}
if (mask->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_t *mask_surface = ((cairo_surface_pattern_t *)mask)->surface;
mask_surface = _cairo_surface_get_source (mask_surface, NULL);
if (_cairo_surface_is_recording (mask_surface)) {
backend_mask_status =
_analyze_recording_surface_pattern (surface, mask);
if (_cairo_int_status_is_error (backend_mask_status))
return backend_mask_status;
}
}
backend_status =
_cairo_analysis_surface_merge_status (backend_source_status,
backend_mask_status);
}
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
if (_cairo_operator_bounded_by_mask (op)) {
cairo_rectangle_int_t mask_extents;
_cairo_pattern_get_extents (mask, &mask_extents);
_cairo_rectangle_intersect (&extents, &mask_extents);
}
return _add_operation (surface, &extents, backend_status);
}
static cairo_int_status_t
_cairo_analysis_surface_stroke (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
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_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t backend_status;
cairo_rectangle_int_t extents;
if (surface->target->backend->stroke == NULL) {
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
} else {
backend_status =
surface->target->backend->stroke (surface->target, op,
source, path, style,
ctm, ctm_inverse,
tolerance, antialias,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
backend_status = _analyze_recording_surface_pattern (surface, source);
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
if (_cairo_operator_bounded_by_mask (op)) {
cairo_rectangle_int_t mask_extents;
cairo_int_status_t status;
status = _cairo_path_fixed_stroke_extents (path, style,
ctm, ctm_inverse,
tolerance,
&mask_extents);
if (unlikely (status))
return status;
_cairo_rectangle_intersect (&extents, &mask_extents);
}
return _add_operation (surface, &extents, backend_status);
}
static cairo_int_status_t
_cairo_analysis_surface_fill (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t backend_status;
cairo_rectangle_int_t extents;
if (surface->target->backend->fill == NULL) {
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
} else {
backend_status =
surface->target->backend->fill (surface->target, op,
source, path, fill_rule,
tolerance, antialias,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
backend_status = _analyze_recording_surface_pattern (surface, source);
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
if (_cairo_operator_bounded_by_mask (op)) {
cairo_rectangle_int_t mask_extents;
_cairo_path_fixed_fill_extents (path, fill_rule, tolerance,
&mask_extents);
_cairo_rectangle_intersect (&extents, &mask_extents);
}
return _add_operation (surface, &extents, backend_status);
}
static cairo_int_status_t
_cairo_analysis_surface_show_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t status, backend_status;
cairo_rectangle_int_t extents, glyph_extents;
/* Adapted from _cairo_surface_show_glyphs */
if (surface->target->backend->show_glyphs != NULL) {
backend_status =
surface->target->backend->show_glyphs (surface->target, op,
source,
glyphs, num_glyphs,
scaled_font,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
else if (surface->target->backend->show_text_glyphs != NULL)
{
backend_status =
surface->target->backend->show_text_glyphs (surface->target, op,
source,
NULL, 0,
glyphs, num_glyphs,
NULL, 0,
FALSE,
scaled_font,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
else
{
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
backend_status = _analyze_recording_surface_pattern (surface, source);
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
if (_cairo_operator_bounded_by_mask (op)) {
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs,
num_glyphs,
&glyph_extents,
NULL);
if (unlikely (status))
return status;
_cairo_rectangle_intersect (&extents, &glyph_extents);
}
return _add_operation (surface, &extents, backend_status);
}
static cairo_bool_t
_cairo_analysis_surface_has_show_text_glyphs (void *abstract_surface)
{
cairo_analysis_surface_t *surface = abstract_surface;
return cairo_surface_has_show_text_glyphs (surface->target);
}
static cairo_int_status_t
_cairo_analysis_surface_show_text_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const char *utf8,
int utf8_len,
cairo_glyph_t *glyphs,
int num_glyphs,
const cairo_text_cluster_t *clusters,
int num_clusters,
cairo_text_cluster_flags_t cluster_flags,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t status, backend_status;
cairo_rectangle_int_t extents, glyph_extents;
/* Adapted from _cairo_surface_show_glyphs */
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
if (surface->target->backend->show_text_glyphs != NULL) {
backend_status =
surface->target->backend->show_text_glyphs (surface->target, op,
source,
utf8, utf8_len,
glyphs, num_glyphs,
clusters, num_clusters,
cluster_flags,
scaled_font,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_UNSUPPORTED &&
surface->target->backend->show_glyphs != NULL)
{
backend_status =
surface->target->backend->show_glyphs (surface->target, op,
source,
glyphs, num_glyphs,
scaled_font,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
backend_status = _analyze_recording_surface_pattern (surface, source);
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
if (_cairo_operator_bounded_by_mask (op)) {
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs,
num_glyphs,
&glyph_extents,
NULL);
if (unlikely (status))
return status;
_cairo_rectangle_intersect (&extents, &glyph_extents);
}
return _add_operation (surface, &extents, backend_status);
}
static const cairo_surface_backend_t cairo_analysis_surface_backend = {
CAIRO_INTERNAL_SURFACE_TYPE_ANALYSIS,
_cairo_analysis_surface_finish,
NULL,
NULL, /* create_similar */
NULL, /* create_similar_image */
NULL, /* map_to_image */
NULL, /* unmap */
NULL, /* source */
NULL, /* acquire_source_image */
NULL, /* release_source_image */
NULL, /* snapshot */
NULL, /* copy_page */
NULL, /* show_page */
_cairo_analysis_surface_get_extents,
NULL, /* get_font_options */
NULL, /* flush */
NULL, /* mark_dirty_rectangle */
_cairo_analysis_surface_paint,
_cairo_analysis_surface_mask,
_cairo_analysis_surface_stroke,
_cairo_analysis_surface_fill,
NULL, /* fill_stroke */
_cairo_analysis_surface_show_glyphs,
_cairo_analysis_surface_has_show_text_glyphs,
_cairo_analysis_surface_show_text_glyphs
};
cairo_surface_t *
_cairo_analysis_surface_create (cairo_surface_t *target)
{
cairo_analysis_surface_t *surface;
cairo_status_t status;
status = target->status;
if (unlikely (status))
return _cairo_surface_create_in_error (status);
surface = malloc (sizeof (cairo_analysis_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
/* I believe the content type here is truly arbitrary. I'm quite
* sure nothing will ever use this value. */
_cairo_surface_init (&surface->base,
&cairo_analysis_surface_backend,
NULL, /* device */
CAIRO_CONTENT_COLOR_ALPHA);
cairo_matrix_init_identity (&surface->ctm);
surface->has_ctm = FALSE;
surface->target = cairo_surface_reference (target);
surface->first_op = TRUE;
surface->has_supported = FALSE;
surface->has_unsupported = FALSE;
_cairo_region_init (&surface->supported_region);
_cairo_region_init (&surface->fallback_region);
surface->page_bbox.p1.x = 0;
surface->page_bbox.p1.y = 0;
surface->page_bbox.p2.x = 0;
surface->page_bbox.p2.y = 0;
return &surface->base;
}
void
_cairo_analysis_surface_set_ctm (cairo_surface_t *abstract_surface,
const cairo_matrix_t *ctm)
{
cairo_analysis_surface_t *surface;
if (abstract_surface->status)
return;
surface = (cairo_analysis_surface_t *) abstract_surface;
surface->ctm = *ctm;
surface->has_ctm = ! _cairo_matrix_is_identity (&surface->ctm);
}
void
_cairo_analysis_surface_get_ctm (cairo_surface_t *abstract_surface,
cairo_matrix_t *ctm)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
*ctm = surface->ctm;
}
cairo_region_t *
_cairo_analysis_surface_get_supported (cairo_surface_t *abstract_surface)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
return &surface->supported_region;
}
cairo_region_t *
_cairo_analysis_surface_get_unsupported (cairo_surface_t *abstract_surface)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
return &surface->fallback_region;
}
cairo_bool_t
_cairo_analysis_surface_has_supported (cairo_surface_t *abstract_surface)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
return surface->has_supported;
}
cairo_bool_t
_cairo_analysis_surface_has_unsupported (cairo_surface_t *abstract_surface)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
return surface->has_unsupported;
}
void
_cairo_analysis_surface_get_bounding_box (cairo_surface_t *abstract_surface,
cairo_box_t *bbox)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
*bbox = surface->page_bbox;
}
/* null surface type: a surface that does nothing (has no side effects, yay!) */
static cairo_int_status_t
_return_success (void)
{
return CAIRO_STATUS_SUCCESS;
}
/* These typedefs are just to silence the compiler... */
typedef cairo_int_status_t
(*_paint_func) (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip);
typedef cairo_int_status_t
(*_mask_func) (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
const cairo_clip_t *clip);
typedef cairo_int_status_t
(*_stroke_func) (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
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_clip_t *clip);
typedef cairo_int_status_t
(*_fill_func) (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip);
typedef cairo_int_status_t
(*_show_glyphs_func) (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip);
static const cairo_surface_backend_t cairo_null_surface_backend = {
CAIRO_INTERNAL_SURFACE_TYPE_NULL,
NULL, /* finish */
NULL, /* only accessed through the surface functions */
NULL, /* create_similar */
NULL, /* create similar image */
NULL, /* map to image */
NULL, /* unmap image*/
NULL, /* source */
NULL, /* acquire_source_image */
NULL, /* release_source_image */
NULL, /* snapshot */
NULL, /* copy_page */
NULL, /* show_page */
NULL, /* get_extents */
NULL, /* get_font_options */
NULL, /* flush */
NULL, /* mark_dirty_rectangle */
(_paint_func) _return_success, /* paint */
(_mask_func) _return_success, /* mask */
(_stroke_func) _return_success, /* stroke */
(_fill_func) _return_success, /* fill */
NULL, /* fill_stroke */
(_show_glyphs_func) _return_success, /* show_glyphs */
NULL, /* has_show_text_glyphs */
NULL /* show_text_glyphs */
};
cairo_surface_t *
_cairo_null_surface_create (cairo_content_t content)
{
cairo_surface_t *surface;
surface = malloc (sizeof (cairo_surface_t));
if (unlikely (surface == NULL)) {
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
}
_cairo_surface_init (surface,
&cairo_null_surface_backend,
NULL, /* device */
content);
return surface;
}
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