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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005 Red Hat, Inc.
* Copyright © 2009 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., 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 University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <cworth@cworth.org>
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "cairoint.h"
#include "cairo-error-private.h"
#include "cairo-surface-snapshot-private.h"
static cairo_status_t
_cairo_surface_snapshot_finish (void *abstract_surface)
{
cairo_surface_snapshot_t *surface = abstract_surface;
cairo_surface_destroy (surface->clone);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_surface_snapshot_acquire_source_image (void *abstract_surface,
cairo_image_surface_t **image_out,
void **extra_out)
{
cairo_surface_snapshot_t *surface = abstract_surface;
return _cairo_surface_acquire_source_image (surface->target, image_out, extra_out);
}
static void
_cairo_surface_snapshot_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *extra)
{
cairo_surface_snapshot_t *surface = abstract_surface;
_cairo_surface_release_source_image (surface->target, image, extra);
}
static cairo_bool_t
_cairo_surface_snapshot_get_extents (void *abstract_surface,
cairo_rectangle_int_t *extents)
{
cairo_surface_snapshot_t *surface = abstract_surface;
return _cairo_surface_get_extents (surface->target, extents);
}
static const cairo_surface_backend_t _cairo_surface_snapshot_backend = {
CAIRO_INTERNAL_SURFACE_TYPE_SNAPSHOT,
NULL, /* create similar */
_cairo_surface_snapshot_finish,
_cairo_surface_snapshot_acquire_source_image,
_cairo_surface_snapshot_release_source_image,
NULL, NULL, /* acquire, release dest */
NULL, /* clone similar */
NULL, /* composite */
NULL, /* fill rectangles */
NULL, /* composite trapezoids */
NULL, /* create span renderer */
NULL, /* check span renderer */
NULL, /* copy_page */
NULL, /* show_page */
_cairo_surface_snapshot_get_extents,
};
static void
_cairo_surface_snapshot_copy_on_write (cairo_surface_t *surface)
{
cairo_surface_snapshot_t *snapshot = (cairo_surface_snapshot_t *) surface;
cairo_image_surface_t *image;
cairo_image_surface_t *clone;
void *extra;
cairo_status_t status;
/* We need to make an image copy of the original surface since the
* snapshot may exceed the lifetime of the original device, i.e.
* when we later need to use the snapshot the data may have already
* been lost.
*/
status = _cairo_surface_acquire_source_image (snapshot->target, &image, &extra);
if (unlikely (status)) {
snapshot->target = _cairo_surface_create_in_error (status);
return;
}
clone = (cairo_image_surface_t *)
_cairo_image_surface_create_with_pixman_format (NULL,
image->pixman_format,
image->width,
image->height,
0);
if (likely (clone->base.status == CAIRO_STATUS_SUCCESS)) {
pixman_image_composite (PIXMAN_OP_SRC,
image->pixman_image, NULL, clone->pixman_image,
0, 0,
0, 0,
0, 0,
image->width, image->height);
clone->base.is_clear = FALSE;
snapshot->clone = &clone->base;
} else {
snapshot->clone = &clone->base;
}
_cairo_surface_release_source_image (snapshot->target, image, extra);
snapshot->target = snapshot->clone;
}
/**
* _cairo_surface_snapshot
* @surface: a #cairo_surface_t
*
* Make an immutable reference to @surface. It is an error to call a
* surface-modifying function on the result of this function. The
* resulting 'snapshot' is a lazily copied-on-write surface i.e. it
* remains a reference to the original surface until that surface is
* written to again, at which time a copy is made of the original surface
* and the snapshot then points to that instead. Multiple snapshots of the
* same unmodified surface point to the same copy.
*
* The caller owns the return value and should call
* cairo_surface_destroy() when finished with it. This function will not
* return %NULL, but will return a nil surface instead.
*
* Return value: The snapshot surface. Note that the return surface
* may not necessarily be of the same type as @surface.
**/
cairo_surface_t *
_cairo_surface_snapshot (cairo_surface_t *surface)
{
cairo_surface_snapshot_t *snapshot;
cairo_status_t status;
if (unlikely (surface->status))
return _cairo_surface_create_in_error (surface->status);
if (surface->finished)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
if (surface->snapshot_of != NULL)
return cairo_surface_reference (surface);
if (surface->backend->snapshot != NULL) {
cairo_surface_t *snap;
snap = surface->backend->snapshot (surface);
if (snap != NULL)
return snap;
}
snapshot = (cairo_surface_snapshot_t *)
_cairo_surface_has_snapshot (surface, &_cairo_surface_snapshot_backend);
if (snapshot != NULL)
return cairo_surface_reference (&snapshot->base);
snapshot = malloc (sizeof (cairo_surface_snapshot_t));
if (unlikely (snapshot == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
_cairo_surface_init (&snapshot->base,
&_cairo_surface_snapshot_backend,
NULL, /* device */
surface->content);
snapshot->target = surface;
snapshot->clone = NULL;
status = _cairo_surface_copy_mime_data (&snapshot->base, surface);
if (unlikely (status)) {
cairo_surface_destroy (&snapshot->base);
return _cairo_surface_create_in_error (status);
}
snapshot->base.device_transform = surface->device_transform;
snapshot->base.device_transform_inverse = surface->device_transform_inverse;
status = _cairo_surface_attach_snapshot (surface,
&snapshot->base,
_cairo_surface_snapshot_copy_on_write);
if (unlikely (status)) {
cairo_surface_destroy (&snapshot->base);
return _cairo_surface_create_in_error (status);
}
return &snapshot->base;
}
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