Hi
I am trying to scale down a (possibly shaped) window using XRender to a pixmap.
The transform matrix is the usual matrix for scaling, i.e:
1.0 0.0 0.0
0.0 1.0 0.0
0.0 0.0 scale
My code does exactly this:
pa.subwindow_mode = IncludeInferiors;
srcPicture = XRenderCreatePicture (dpy, window_id, render_format,
CPSubwindowMode, &pa);
XRenderSetPictureFilter (dpy, srcPicture, FilterBest, NULL, 0);
region = XFixesCreateRegionFromWindow (dpy, window_id,
WindowRegionBounding);
XFixesSetPictureClipRegion (dpy, srcPicture, 0, 0, region);
XFixesDestroyRegion (dpy, region);
render_format = XRenderFindStandardFormat (dpy, PictStandardARGB32);
destPicture = XRenderCreatePicture (dpy, pixmap, render_format, 0, NULL);
XRenderFillRectangle (dpy, PictOpSrc, destPicture, &c, 0, 0,
dest_w, dest_h);
XRenderSetPictureTransform (dpy, srcPicture, &transform);
XRenderComposite (dpy, PictOpOver, srcPicture, None, destPicture,
0, 0, 0, 0, 0, 0, dest_w, dest_h);
The scaling works as expected, but the problem is that the clipping
region set on the source picture is applied *after* the transformation
and not before (thus possibly ruining the result when the window is
shaped), and I fail to understand why.
Could someone help me understanding what I'm doing wrong here?
Cheers,
Olivier.
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