cairo-surface-snapshot.c [plain text]
#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_status_t status = CAIRO_STATUS_SUCCESS;
if (surface->clone != NULL) {
cairo_surface_finish (surface->clone);
status = surface->clone->status;
cairo_surface_destroy (surface->clone);
}
return status;
}
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,
_cairo_surface_snapshot_finish,
_cairo_surface_snapshot_acquire_source_image,
_cairo_surface_snapshot_release_source_image,
NULL, NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
_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;
status = _cairo_surface_acquire_source_image (snapshot->target, &image, &extra);
if (unlikely (status)) {
snapshot->target = _cairo_surface_create_in_error (status);
status = _cairo_surface_set_error (surface, 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)) {
if (clone->stride == image->stride) {
memcpy (clone->data, image->data, image->stride * image->height);
} else {
pixman_image_composite32 (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;
status = _cairo_surface_set_error (surface, clone->base.status);
}
_cairo_surface_release_source_image (snapshot->target, image, extra);
snapshot->target = snapshot->clone;
snapshot->base.type = snapshot->target->type;
}
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 = _cairo_surface_has_snapshot (surface, surface->backend);
if (snap != NULL)
return cairo_surface_reference (snap);
snap = surface->backend->snapshot (surface);
if (snap != NULL) {
if (unlikely (snap->status))
return snap;
status = _cairo_surface_copy_mime_data (snap, surface);
if (unlikely (status)) {
cairo_surface_destroy (snap);
return _cairo_surface_create_in_error (status);
}
snap->device_transform = surface->device_transform;
snap->device_transform_inverse = surface->device_transform_inverse;
_cairo_surface_attach_snapshot (surface, 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,
surface->content);
snapshot->base.type = surface->type;
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;
_cairo_surface_attach_snapshot (surface,
&snapshot->base,
_cairo_surface_snapshot_copy_on_write);
return &snapshot->base;
}