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Fix tests for maximum number of colours when creating a colourmap, so a 

32-bit visual (e.g. ARGB) doesn't overflow an int when attempting to do
1 << 32. (Benjamin Herrenschmidt)
This commit is contained in:
Daniel Stone 2005-09-05 07:43:51 +00:00
parent 5c5c51fa6d
commit c8de8c23fb
1 changed files with 20 additions and 12 deletions
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32
hw/xfree86/common/xf86cmap.c
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@ -245,6 +245,14 @@ CMapCloseScreen (int i, ScreenPtr pScreen)
return (*pScreen->CloseScreen) (i, pScreen);
}
static Bool
CMapColormapUseMax(VisualPtr pVisual, CMapScreenPtr pScreenPriv)
{
if (pVisual->nplanes > 16)
return TRUE;
return ((1 << pVisual->nplanes) > pScreenPriv->maxColors);
}
static Bool
CMapAllocateColormapPrivate(ColormapPtr pmap)
{
@ -255,7 +263,7 @@ CMapAllocateColormapPrivate(ColormapPtr pmap)
int numColors;
LOCO *colors;
if((1 << pmap->pVisual->nplanes) > pScreenPriv->maxColors)
if (CMapColormapUseMax(pmap->pVisual, pScreenPriv))
numColors = pmap->pVisual->ColormapEntries;
else
numColors = 1 << pmap->pVisual->nplanes;
@ -371,7 +379,7 @@ CMapStoreColors(
(CMapColormapPtr) pmap->devPrivates[CMapColormapIndex].ptr;
int i;
if((1 << pVisual->nplanes) > pScreenPriv->maxColors) {
if (CMapColormapUseMax(pVisual, pScreenPriv)) {
int index;
num = 0;
@ -440,10 +448,10 @@ CMapInstallColormap(ColormapPtr pmap)
if (miInstalledMaps[index])
pmap = miInstalledMaps[index];
if(!(pScreenPriv->flags & CMAP_PALETTED_TRUECOLOR) &&
(pmap->pVisual->class == TrueColor) &&
((1 << pmap->pVisual->nplanes) > pScreenPriv->maxColors))
return;
if (!(pScreenPriv->flags & CMAP_PALETTED_TRUECOLOR) &&
(pmap->pVisual->class == TrueColor) &&
CMapColormapUseMax(pmap->pVisual, pScreenPriv))
return;
if(LOAD_PALETTE(pmap, index))
CMapReinstallMap(pmap);
@ -572,7 +580,7 @@ CMapRefreshColors(ColormapPtr pmap, int defs, int* indices)
}
break;
case TrueColor:
if((1 << pVisual->nplanes) > pScreenPriv->maxColors) {
if (CMapColormapUseMax(pVisual, pScreenPriv)) {
for(i = 0; i <= reds; i++)
colors[i].red = gamma[i * maxValue / reds].red;
for(i = 0; i <= greens; i++)
@ -615,7 +623,7 @@ CMapRefreshColors(ColormapPtr pmap, int defs, int* indices)
}
break;
case DirectColor:
if((1 << pVisual->nplanes) > pScreenPriv->maxColors) {
if (CMapColormapUseMax(pVisual, pScreenPriv)) {
for(i = 0; i < defs; i++) {
index = indices[i];
if(index <= reds)
@ -930,9 +938,9 @@ CMapChangeGamma(
pScrn->vtSema || pScreenPriv->isDGAmode)) {
ColormapPtr pMap = miInstalledMaps[pScreen->myNum];
if(!(pScreenPriv->flags & CMAP_PALETTED_TRUECOLOR) &&
if (!(pScreenPriv->flags & CMAP_PALETTED_TRUECOLOR) &&
(pMap->pVisual->class == TrueColor) &&
((1 << pMap->pVisual->nplanes) > pScreenPriv->maxColors)) {
CMapColormapUseMax(pMap->pVisual, pScreenPriv)) {
/* if the current map doesn't have a palette look
for another map to change the gamma on. */
@ -1017,9 +1025,9 @@ xf86ChangeGammaRamp(
pScrn->vtSema || pScreenPriv->isDGAmode)) {
ColormapPtr pMap = miInstalledMaps[pScreen->myNum];
if(!(pScreenPriv->flags & CMAP_PALETTED_TRUECOLOR) &&
if (!(pScreenPriv->flags & CMAP_PALETTED_TRUECOLOR) &&
(pMap->pVisual->class == TrueColor) &&
((1 << pMap->pVisual->nplanes) > pScreenPriv->maxColors)) {
CMapColormapUseMax(pMap->pVisual, pScreenPriv)) {
/* if the current map doesn't have a palette look
for another map to change the gamma on. */