95140 2012-08-27 15:34:41 -0700 [chromium] WebGL canvas cleared by printing 2013-04-15 08:21:45 -0700 1 1 1 Unclassified WebKit WebGL 528+ (Nightly build) Unspecified Unspecified RESOLVED WONTFIX P2 Normal --- 1 jamesr webkit-unassigned gman jbauman kbr schenney twiz zmo oldest_to_newest 705775 0 jamesr 2012-08-27 15:34:41 -0700 Load up a page with WebGL that doesn't repaint on every frame (for instance http://trac.webkit.org/export/126806/trunk/LayoutTests/fast/canvas/webgl/webgl-composite-modes.html) and print. The webgl canvas content is gone after printing if the preserveDrawingBuffer attribute is false. It appears the readback is destructive on the canvas. 705783 1 kbr 2012-08-27 15:37:55 -0700 Darn it -- this keeps regressing. We need a way to write printing layout tests. 705792 2 jamesr 2012-08-27 15:43:05 -0700 Maybe we could add a testRunner hook that "prints" into a null WebCanvas so at least we'd hit all of the printing logic in WebKit and verify that it didn't hose any state, even though we couldn't test on what showed up in the printed output? 705802 3 kbr 2012-08-27 15:46:06 -0700 That would be an improvement -- it would catch this particular error -- but it would be better if we could also (optionally) examine the printed results as a pixel test. 875844 4 schenney 2013-04-15 08:21:45 -0700 https://code.google.com/p/chromium/issues/detail?id=231368