diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2013-02-08 22:17:13 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2013-02-08 22:17:13 +0000 |
| commit | d4651676e1496f0354acb0ef045e8b65601edf6d (patch) | |
| tree | 57f9b03aa6396ca868dbeb10e7eef7befd7c5d11 | |
| parent | 2d7ac9e737f37daf8490c27e6a04c65bba642645 (diff) | |
win32: Clear the similar-image before returning to the user
Our userspace API mandates that surfaces created for the user are
cleared before they are returned. Make it so for the win32 similar image
constructor.
Reported-by: Michael Henning <drawoc@darkrefraction.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=60519
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
| -rw-r--r-- | src/win32/cairo-win32-display-surface.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/win32/cairo-win32-display-surface.c b/src/win32/cairo-win32-display-surface.c index b0c2f903..ccd285d7 100644 --- a/src/win32/cairo-win32-display-surface.c +++ b/src/win32/cairo-win32-display-surface.c @@ -392,6 +392,7 @@ _cairo_win32_display_surface_create_similar_image (void *abstract_other, int height) { cairo_win32_display_surface_t *surface = abstract_other; + cairo_image_surface_t *image; surface = (cairo_win32_display_surface_t *) _cairo_win32_display_surface_create_for_dc (surface->win32.dc, @@ -399,7 +400,14 @@ _cairo_win32_display_surface_create_similar_image (void *abstract_other, if (surface->win32.base.status) return &surface->win32.base; - return surface->image; + /* And clear in order to comply with our user API semantics */ + image = (cairo_image_surface_t *) surface->image; + if (! image->base.is_clear) { + memset (image->data, 0, image->stride * height); + image->base.is_clear = TRUE; + } + + return &image->base; } static cairo_status_t |