[Bug 35579] Poor performance in Firefox 4

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Mar 24 15:41:21 PDT 2011


--- Comment #18 from Konstantin Svist <fry.kun at gmail.com> 2011-03-24 15:41:21 PDT ---
If you look at the code on the page, it does indeed have a single image that's
640x7760 in size, but it only renders a 640x480 part of it on each draw
ctx.drawImage(img, 0, offset, 640, 480, 0, 0, 64, 48);

My guess is that since this is a single call, the driver rejects the operation
from being done in hardware (because the source image is too large), and
switches fully to the software rendering -- software then "crops" the image and
performs all the necessary transformations.
If that's the case, can't the transformation be done in hardware after the

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