Created attachment 148306 [details] Testcase The attached file displays a few copies of an image masked by itself. On the left side it is also under a clip-path that is as big as the image. The clip-path should not have any effect on the displayed images. In Firefox, Opera, as well as Safari, the left side exactly matches the right. Chrome draws one-pixel wide lines around the object that change with zoom levels (the image is only fine if it is perfectly aligned on pixel boundaries).
Created attachment 148307 [details] Screenshot with artifacts on left side
Note: If the clipping path is complex (i.e. containing more than one path and thus skipping pathOnlyClipping (http://code.google.com/p/chromium/source/search?q=RenderSVGResourceClipper%3A%3ApathOnlyClipping&origq=RenderSVGResourceClipper%3A%3ApathOnlyClipping&btnG=Search+Trunk)), the images are drawn properly.
Created attachment 148316 [details] Testcase with simple and complex clipping This uses pathOnlyClipping on the left side and forces image buffer clipping on the right by including an additional empty <rect /> in the clip path. The right side is OK, the left one has artifacts.