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[mmx] Fix mask creation bugs

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This line:

    mask = mask | mask >> 8 | mask >> 16 | mask >> 24;

only works when mask has 0s in the lower 24 bits, so add

     mask &= 0xff000000;

before.

Reported by Todd Rinaldo on the #cairo IRC channel.
This commit is contained in:
Søren Sandmann Pedersen 2010-04-07 19:34:41 -04:00
parent 714559dccd
commit a652d5c154
1 changed files with 2 additions and 0 deletions
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2
pixman/pixman-mmx.c
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@ -1385,6 +1385,7 @@ mmx_composite_over_8888_n_8888 (pixman_implementation_t *imp,
PIXMAN_IMAGE_GET_LINE (src_image, src_x, src_y, uint32_t, src_stride, src_line, 1);
mask = _pixman_image_get_solid (mask_image, dst_image->bits.format);
mask &= 0xff000000;
mask = mask | mask >> 8 | mask >> 16 | mask >> 24;
vmask = load8888 (mask);
srca = MC (4x00ff);
@ -1470,6 +1471,7 @@ mmx_composite_over_x888_n_8888 (pixman_implementation_t *imp,
PIXMAN_IMAGE_GET_LINE (src_image, src_x, src_y, uint32_t, src_stride, src_line, 1);
mask = _pixman_image_get_solid (mask_image, dst_image->bits.format);
mask &= 0xff000000;
mask = mask | mask >> 8 | mask >> 16 | mask >> 24;
vmask = load8888 (mask);
srca = MC (4x00ff);