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Bug #15369: Don't reduce Over to Src for transform + RepeatNone.

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Only do no-src-alpha optimizations for a RepeatNone source if we can
easily probe that we won't sample outside the edges of the source.
This commit is contained in:
Owen Taylor 2008-06-24 12:40:47 -04:00 committed by Adam Jackson
parent 100afae578
commit 574c62e305
1 changed files with 14 additions and 2 deletions
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16
render/picture.c
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@ -1548,12 +1548,24 @@ FreePictFormat (pointer pPictFormat,
* being careful to avoid these cases.
*/
static CARD8
ReduceCompositeOp (CARD8 op, PicturePtr pSrc, PicturePtr pMask, PicturePtr pDst)
ReduceCompositeOp (CARD8 op, PicturePtr pSrc, PicturePtr pMask, PicturePtr pDst,
INT16 xSrc, INT16 ySrc, CARD16 width, CARD16 height)
{
Bool no_src_alpha, no_dst_alpha;
/* Sampling off the edge of a RepeatNone picture introduces alpha
* even if the picture itself doesn't have alpha. We don't try to
* detect every case where we don't sample off the edge, just the
* simplest case where there is no transform on the source
* picture.
*/
no_src_alpha = PICT_FORMAT_COLOR(pSrc->format) &&
PICT_FORMAT_A(pSrc->format) == 0 &&
(pSrc->repeatType != RepeatNone ||
(!pSrc->transform &&
xSrc >= 0 && ySrc >= 0 &&
xSrc + width <= pSrc->pDrawable->width &&
ySrc + height <= pSrc->pDrawable->height)) &&
pSrc->alphaMap == NULL &&
pMask == NULL;
no_dst_alpha = PICT_FORMAT_COLOR(pDst->format) &&
@ -1655,7 +1667,7 @@ CompositePicture (CARD8 op,
ValidatePicture (pMask);
ValidatePicture (pDst);
op = ReduceCompositeOp (op, pSrc, pMask, pDst);
op = ReduceCompositeOp (op, pSrc, pMask, pDst, xSrc, ySrc, width, height);
if (op == PictOpDst)
return;