On Fri, 04 Nov 2011 15:11:28 +0100, Hans-Peter Budek <peter.bu...@gmx.de> wrote: > Chris Wilson wrote: > > > > > Do you mind describing you use-case for alphamaps and could you create a > > little benchmark for your workload? > > -Chris > > > > > I´am programming a animated crossfade from one window to another. > Both windows are not created by my application. The content > of both windows is previously stored in a ARGB32 picture > (without a usable alpha channel). To apply an alpha channel, I use:
So what I think you want to achieve is: dst = a * srcA + (1-a) * srcB which can be acheived (and hitting the accelerated paths) with: Picture a = XRenderCreateSolidFill(dpy, &(XRenderColor){.alpha = 0xffff * Fade}); Picture ia = XRenderCreateSolidFill(dpy, &(XRenderColor){.alpha = 0xffff * (1-Fade)}); XRenderComposite(dpy, PictOpSrc, srcA, a, dst, 0, 0, 0, 0, 0, 0, width, height); XRenderComposite(dpy, PictOpAdd, srcB, ia, dst, 0, 0, 0, 0, 0, 0, width, height); XRenderFreePicture(dpy, ia); XRenderFreePicture(dpy, a); -Chris -- Chris Wilson, Intel Open Source Technology Centre
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