After commit commit 6b3e5cd39c81941a73ed709eadf8beae5407dc05 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Jul 20 14:32:10 2011 +0100 xcb: Reduce one pass for masking, now just 2 passes required! Another 10% off fishbowl for both snb and pnv. [Note this exposes the bugs in the polygon clipper; naive *and* broken.] Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> I have next (still invisible) line from the bottom on the top of webpage in firefox (please chec the attached screenshot). It appears during scrolling and goes away after redraw. For example, it can be easily reproduced on page http://cacm.acm.org/magazines/2011/8/114933-the-robustness-principle-reconsidered/fulltext Sorry for ambiguous summary.
Created attachment 49726 [details] screenshot
We fixed one related bug: commit cac96c8083214f8e5aa65e9a527f9fa3e813b149 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Jul 27 17:02:53 2011 +0100 polygon: Fix clipping of edges outside of their range Uli Schlachter analysed the error behind the polygon reduction and discovered that it was due to the clipping of a line which intersects the clip box (p1, p2) but is range limited by (top, bottom) to be inside the clip box. Fixes hatching Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> commit d7abdab931c1219314c07c0ecf21b0afef19108a Author: Andrea Canciani <ranma42@gmail.com> Date: Wed Jul 27 18:58:03 2011 +0200 polygon: Fix generic case of edge clipping The edge clipper is more complicated than it should be and contains a subtle bug: when an edge is almost horizontal, it is always considered as having a positive slope. Explain what should be done and do it in a simpler way. Fixes horizontal-clip. does this fix yours? If not we need another test case...
Screenshot was taken on latest git: HEAD is now at 2342e4d image: extend support of direct replay for paginated surfaces
Still the same with HEAD is now at 7b5b29c xcb: Handle deferred clear in _upload_image_inplace
Still happens with cairo git-61c0f67.
cannot reproduce with latest git
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