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image: Allow a snapshot to steal the original memory upon finish

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-04-27 11:41:41 +01:00
parent 957a9cc619
commit 455b4de1fc
3 changed files with 22 additions and 0 deletions
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18
src/cairo-image-surface.c
View file

@ -753,6 +753,24 @@ _cairo_image_surface_snapshot (void *abstract_surface)
cairo_image_surface_t *image = abstract_surface;
cairo_image_surface_t *clone;
/* If we own the image, we can simply steal the memory for the snapshot */
if (image->owns_data && image->base._finishing) {
clone = (cairo_image_surface_t *)
_cairo_image_surface_create_for_pixman_image (image->pixman_image,
image->pixman_format);
if (unlikely (clone->base.status))
return &clone->base;
image->pixman_image = NULL;
image->owns_data = FALSE;
clone->transparency = image->transparency;
clone->color = image->color;
clone->owns_data = FALSE;
return &clone->base;
}
clone = (cairo_image_surface_t *)
_cairo_image_surface_create_with_pixman_format (NULL,
image->pixman_format,

1
src/cairo-surface-private.h
View file

@ -65,6 +65,7 @@ struct _cairo_surface {
unsigned int serial;
cairo_damage_t *damage;
unsigned _finishing : 1;
unsigned finished : 1;
unsigned is_clear : 1;
unsigned has_font_options : 1;

3
src/cairo-surface.c
View file

@ -108,6 +108,7 @@ const cairo_surface_t name = { \
0, /* unique id */ \
0, /* serial */ \
NULL, /* damage */ \
FALSE, /* _finishing */ \
FALSE, /* finished */ \
TRUE, /* is_clear */ \
FALSE, /* has_font_options */ \
@ -905,6 +906,8 @@ _cairo_surface_finish (cairo_surface_t *surface)
cairo_surface_flush (surface);
/* update the snapshots *before* we declare the surface as finished */
surface->_finishing = TRUE;
_cairo_surface_detach_snapshots (surface);
if (surface->snapshot_of != NULL)
_cairo_surface_detach_snapshot (surface);