andreacavalli/xserver-multidpi
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Don't let alpha maps recurse in fb. Bug 23581.

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Recursive alpha maps (where one picture's alpha map is set to a
picture with an external alpha map) would be all fine and dandy,
except for the case where the client constructs a loop. Detecting this
case when setting the alpha map values would be difficult as any time
an alpha map is set, the server would have to check for the looping
case.

Instead, a far simpler fix is to simply disallow recursive alpha maps
in the rendering code, the Render spec is ambiguous in this area and
allows us to to ignore the recursive case.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Keith Packard 2010-05-21 09:01:43 -07:00
parent 70a94c5b7a
commit ff70848e62
1 changed files with 18 additions and 6 deletions
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24
fb/fbpict.c
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@ -332,8 +332,11 @@ create_bits_picture (PicturePtr pict,
return image;
}
static pixman_image_t *
image_from_pict_internal (PicturePtr pict, Bool has_clip, int *xoff, int *yoff, Bool is_alpha_map);
static void
set_image_properties (pixman_image_t *image, PicturePtr pict, Bool has_clip, int *xoff, int *yoff)
set_image_properties (pixman_image_t *image, PicturePtr pict, Bool has_clip, int *xoff, int *yoff, Bool is_alpha_map)
{
pixman_repeat_t repeat;
pixman_filter_t filter;
@ -382,10 +385,13 @@ set_image_properties (pixman_image_t *image, PicturePtr pict, Bool has_clip, int
pixman_image_set_repeat (image, repeat);
if (pict->alphaMap)
/* Fetch alpha map unless 'pict' is being used
* as the alpha map for this operation
*/
if (pict->alphaMap && !is_alpha_map)
{
int alpha_xoff, alpha_yoff;
pixman_image_t *alpha_map = image_from_pict (pict->alphaMap, FALSE, &alpha_xoff, &alpha_yoff);
pixman_image_t *alpha_map = image_from_pict_internal (pict->alphaMap, FALSE, &alpha_xoff, &alpha_yoff, TRUE);
pixman_image_set_alpha_map (
image, alpha_map, pict->alphaOrigin.x, pict->alphaOrigin.y);
@ -417,8 +423,8 @@ set_image_properties (pixman_image_t *image, PicturePtr pict, Bool has_clip, int
pixman_image_set_source_clipping (image, TRUE);
}
pixman_image_t *
image_from_pict (PicturePtr pict, Bool has_clip, int *xoff, int *yoff)
static pixman_image_t *
image_from_pict_internal (PicturePtr pict, Bool has_clip, int *xoff, int *yoff, Bool is_alpha_map)
{
pixman_image_t *image = NULL;
@ -452,11 +458,17 @@ image_from_pict (PicturePtr pict, Bool has_clip, int *xoff, int *yoff)
}
if (image)
set_image_properties (image, pict, has_clip, xoff, yoff);
set_image_properties (image, pict, has_clip, xoff, yoff, is_alpha_map);
return image;
}
pixman_image_t *
image_from_pict (PicturePtr pict, Bool has_clip, int *xoff, int *yoff)
{
return image_from_pict_internal (pict, has_clip, xoff, yoff, FALSE);
}
void
free_pixman_pict (PicturePtr pict, pixman_image_t *image)
{