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The spec requires the resulting RGB channels for LuminanceToAlpha to be
0 (and not just scaled by the luminance value</facepalm>):
| R' | | 0 0 0 0 0 | | R |
| G' | | 0 0 0 0 0 | | G |
| B' | = | 0 0 0 0 0 | * | B |
| A' | | 0.2125 0.7154 0.0721 0 0 | | A |
| 1 | | 0 0 0 0 1 | | 1 |
(http://www.w3.org/TR/2011/REC-SVG11-20110816/filters.html#feColorMatrixElement)
This doesn't affect luminance masking (which depends only on the
resulting alpha channel), but other color filter users may care
about all color components.
R=bsalomon@google.com, reed@google.com, robertphillips@google.com
Author: fmalita@chromium.org
Review URL: https://codereview.chromium.org/26467003
git-svn-id: http://skia.googlecode.com/svn/trunk@11713 2bbb7eff-a529-9590-31e7-b0007b416f81
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commit-bot@chromium.org