[Webkit-unassigned] [Bug 51455] [chromium] Reduce canvas.toDataURL("image/png") run-time costs 300% (compression strategy)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51455





--- Comment #2 from noel gordon <noel.gordon at gmail.com>  2010-12-22 18:12:36 PST ---
Extraction results for 800 x 600 px test image, this to determine the compression level used by chromium with the default libpng compressor.

safari 5.0.3 win32 (baseline)
   x, extract image/png 167 ms length: 1171790 bytes

chrome 10 win32 dev, for compression levels [1-9]
   1, extract image/png 168 ms length: 1237066 bytes
   2, extract image/png 179 ms length: 1222386 bytes
   3, extract image/png 216 ms length: 1188118 bytes
   4, extract image/png 264 ms length: 1136778 bytes
   5, extract image/png 331 ms length: 1120050 bytes
   6, extract image/png 510 ms length: 1098442 bytes ** default
   7, extract image/png 623 ms length: 1091738 bytes
   8, extract image/png 890 ms length: 1087218 bytes
   9, extract image/png 929 ms length: 1086930 bytes

Conclusion: chrome uses the default compression level 6, and is noticeably slower
than Safari even though we both use libpng. For a compressed output size matching
Safari (compression level 3), chrome is still ~50% slower than Safari.

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