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Add new flag, KAA_OFFSCREEN_ALIGN_POT, which tells KAA to align pixmap 

pitches to a power-of-two number of bytes. Useful for Render
    acceleration on older cards.
This commit is contained in:
Eric Anholt 2004-05-14 00:34:28 +00:00
parent 2bea33e881
commit 74b2a76947
3 changed files with 20 additions and 3 deletions
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19
hw/kdrive/src/kaa.c
View File

@ -95,6 +95,18 @@ kaaPixmapSave (ScreenPtr pScreen, KdOffscreenArea *area)
}
}
static int
kaaLog2(int val)
{
int bits;
if (!val)
return 0;
for (bits = 0; val != 0; bits++)
val >>= 1;
return bits - 1;
}
static Bool
kaaPixmapAllocArea (PixmapPtr pPixmap)
{
@ -105,7 +117,12 @@ kaaPixmapAllocArea (PixmapPtr pPixmap)
int bpp = pPixmap->drawable.bitsPerPixel;
CARD16 h = pPixmap->drawable.height;
CARD16 w = pPixmap->drawable.width;
int pitch = KaaPixmapPitch (w * bpp / 8);
int pitch;
if (pKaaScr->info->flags & KAA_OFFSCREEN_ALIGN_POT && w != 1)
w = 1 << (kaaLog2(w - 1) + 1);
pitch = (w * bpp / 8 + pKaaScr->info->offscreenPitch - 1) &
~(pKaaScr->info->offscreenPitch - 1);
pKaaPixmap->devKind = pPixmap->devKind;
pKaaPixmap->devPrivate = pPixmap->devPrivate;

1
hw/kdrive/src/kaa.h
View File

@ -33,7 +33,6 @@
#define KaaGetPixmapPriv(p) ((KaaPixmapPrivPtr)(p)->devPrivates[kaaPixmapPrivateIndex].ptr)
#define KaaSetPixmapPriv(p,a) ((p)->devPrivates[kaaPixmapPrivateIndex].ptr = (pointer) (a))
#define KaaPixmapPriv(p) KaaPixmapPrivPtr pKaaPixmap = KaaGetPixmapPriv(p)
#define KaaPixmapPitch(pitch) (((pitch) + (pKaaScr->info->offscreenPitch - 1)) & ~(pKaaScr->info->offscreenPitch - 1))
typedef struct {
KaaScreenInfoPtr info;

1
hw/kdrive/src/kdrive.h
View File

@ -373,6 +373,7 @@ typedef struct _KaaScreenInfo {
} KaaScreenInfoRec, *KaaScreenInfoPtr;
#define KAA_OFFSCREEN_PIXMAPS (1 << 0)
#define KAA_OFFSCREEN_ALIGN_POT (1 << 1)
/*
* This is the only completely portable way to