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Bug #2986: Add acceleration of GetImage using DownloadFromScreen for the

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ZPixmap, planeMask ~= FB_ALLONES, bitsPerPixel >= 8 case. I'm pretty
    convinced that this is the only case that we care about at all. Tested
    with xwd -root and xwd on a gnome-terminal, in a composited environment
    or not.
This commit is contained in:
Eric Anholt 2006-03-29 22:25:17 +00:00
commit e799dd68e2
3 changed files with 63 additions and 2 deletions
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47
exa/exa_accel.c
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@ -947,15 +947,58 @@ exaPaintWindow(WindowPtr pWin, RegionPtr pRegion, int what)
}
/**
* GetImage isn't accelerated yet, but performs migration so that we'll
* hopefully avoid the read-from-framebuffer cost.
* Accelerates GetImage for solid ZPixmap downloads from framebuffer memory.
*
* This is probably the only case we actually care about. The rest fall through
* to migration and ExaCheckGetImage, which hopefully will result in migration
* pushing the pixmap out of framebuffer.
*/
void
exaGetImage (DrawablePtr pDrawable, int x, int y, int w, int h,
unsigned int format, unsigned long planeMask, char *d)
{
ExaScreenPriv (pDrawable->pScreen);
ExaMigrationRec pixmaps[1];
PixmapPtr pPix;
int xoff, yoff;
Bool ok;
if (pExaScr->swappedOut || pExaScr->info->DownloadFromScreen == NULL)
goto fallback;
/* Only cover the ZPixmap, solid copy case. */
if (format != ZPixmap || !EXA_PM_IS_SOLID(pDrawable, planeMask))
goto fallback;
/* Only try to handle the 8bpp and up cases, since we don't want to think
* about <8bpp.
*/
if (pDrawable->bitsPerPixel < 8)
goto fallback;
/* Migrate, but assume that we could accelerate the download. It is up to
* the migration scheme to ensure that this case doesn't result in bad
* moving of pixmaps.
*/
pixmaps[0].as_dst = FALSE;
pixmaps[0].as_src = TRUE;
pixmaps[0].pPix = exaGetDrawablePixmap (pDrawable);
exaDoMigration (pixmaps, 1, TRUE);
pPix = exaGetOffscreenPixmap (pDrawable, &xoff, &yoff);
if (pPix == NULL)
goto fallback;
xoff += pDrawable->x;
yoff += pDrawable->y;
ok = pExaScr->info->DownloadFromScreen(pPix, x + xoff, y + yoff, w, h, d,
PixmapBytePad(pDrawable, w));
if (ok) {
exaWaitSync(pDrawable->pScreen);
return;
}
fallback:
pixmaps[0].as_dst = FALSE;
pixmaps[0].as_src = TRUE;
pixmaps[0].pPix = exaGetDrawablePixmap (pDrawable);