From 00de16b7ac54d4c620e0be3565c83f58e01567ac Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Sat, 4 Jun 2011 13:47:15 +0200
Subject: [PATCH] image: Don't crash on weird pixman formats
_pixel_to_solid() used to assert that it got a known cairo_format_t.
However, this might not be the case when backends decide to use a pixman
format that is not representable by a cairo format (X and DirectFB are
examples for backends that do that).
This patch makes _pixel_to_solid() return NULL in that case and fixes
the callers to deal with it.
https://bugs.freedesktop.org/show_bug.cgi?id=37916
---
src/cairo-image-surface.c | 23 ++++++++++++++++-------
1 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/src/cairo-image-surface.c b/src/cairo-image-surface.c
index 93ccfe5..a2345b2 100644
--- a/src/cairo-image-surface.c
+++ b/src/cairo-image-surface.c
@@ -1246,10 +1246,12 @@ _pixel_to_solid (cairo_image_surface_t *image, int x, int y)
switch (image->format) {
default:
- case CAIRO_FORMAT_INVALID:
ASSERT_NOT_REACHED;
return NULL;
+ case CAIRO_FORMAT_INVALID:
+ return NULL;
+
case CAIRO_FORMAT_A1:
pixel = *(uint8_t *) (image->data + y * image->stride + x/8);
return pixel & (1 << (x&7)) ? _pixman_black_image () : _pixman_transparent_image ();
@@ -1364,7 +1366,9 @@ _pixman_image_for_surface (const cairo_surface_pattern_t *pattern,
}
else
{
- return _pixel_to_solid (source, sample.x, sample.y);
+ pixman_image = _pixel_to_solid (source, sample.x, sample.y);
+ if (pixman_image)
+ return pixman_image;
}
}
@@ -1403,9 +1407,11 @@ _pixman_image_for_surface (const cairo_surface_pattern_t *pattern,
if (sample.width == 1 && sample.height == 1) {
if (is_contained) {
- return _pixel_to_solid (source,
- sub->extents.x + sample.x,
- sub->extents.y + sample.y);
+ pixman_image = _pixel_to_solid (source,
+ sub->extents.x + sample.x,
+ sub->extents.y + sample.y);
+ if (pixman_image)
+ return pixman_image;
} else {
if (extend == CAIRO_EXTEND_NONE)
return _pixman_transparent_image ();
@@ -1468,8 +1474,11 @@ _pixman_image_for_surface (const cairo_surface_pattern_t *pattern,
else
{
pixman_image = _pixel_to_solid (image, sample.x, sample.y);
- _cairo_surface_release_source_image (pattern->surface, image, extra);
- return pixman_image;
+ if (pixman_image)
+ {
+ _cairo_surface_release_source_image (pattern->surface, image, extra);
+ return pixman_image;
+ }
}
}
--
1.7.7.6