andreacavalli/xserver-multidpi
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Miscomputing pitch in 24bpp modes because of rounding errors.

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This commit is contained in:
Keith Packard 2004-05-20 19:51:44 +00:00
parent b9d920f3dc
commit cde51fd05b
1 changed files with 20 additions and 8 deletions
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28
hw/kdrive/mach64/mach64draw.c
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@ -350,7 +350,6 @@ mach64Setup (PixmapPtr pDst, PixmapPtr pSrc, CARD32 combo, int wait)
CARD32 DP_SET_GUI_ENGINE;
int i;
KdCheckSync (pScreen);
for (i = 0; i < NACCELREG; i++)
if (mach64AccelReg[i].depth == pDst->drawable.depth &&
mach64AccelReg[i].bitsPerPixel == pDst->drawable.bitsPerPixel)
@ -361,14 +360,22 @@ mach64Setup (PixmapPtr pDst, PixmapPtr pSrc, CARD32 combo, int wait)
DP_SET_GUI_ENGINE = mach64AccelReg[i].DP_SET_GUI_ENGINE;
reg = mach64c->reg;
triple = (pDst->drawable.bitsPerPixel == 24);
if (!reg)
return FALSE;
/* pixels / 8 = ((bytes * 8) / bpp) / 8 = bytes / bpp */
DST_PITCH = pDst->devKind / pDst->drawable.bitsPerPixel;
triple = (pDst->drawable.bitsPerPixel == 24);
if (triple)
DST_PITCH *= 3;
{
/* bytes / 8 = bytes >> 3 */
DST_PITCH = pDst->devKind >> 3;
}
else
{
/* pixels / 8 = ((bytes * 8) / bpp) / 8 = bytes / bpp */
DST_PITCH = pDst->devKind / pDst->drawable.bitsPerPixel;
}
/* bytes / 8 */
DST_OFFSET = ((CARD8 *) pDst->devPrivate.ptr - pScreenPriv->screen->memory_base) >> 3;
@ -380,10 +387,15 @@ mach64Setup (PixmapPtr pDst, PixmapPtr pSrc, CARD32 combo, int wait)
0);
if (pSrc)
{
/* pixels / 8 = ((bytes * 8) / bpp) / 8 = bytes / bpp */
SRC_PITCH = pSrc->devKind / pSrc->drawable.bitsPerPixel;
if (triple)
SRC_PITCH *= 3;
{
SRC_PITCH = pSrc->devKind >> 3;
}
else
{
/* pixels / 8 = ((bytes * 8) / bpp) / 8 = bytes / bpp */
SRC_PITCH = pSrc->devKind / pSrc->drawable.bitsPerPixel;
}
/* bytes / 8 */
SRC_OFFSET = ((CARD8 *) pSrc->devPrivate.ptr - pScreenPriv->screen->memory_base) >> 3;