commit-bot@chromium.org
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eaa7797990
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Add luminance mask transfer modes.
This adds kSrcInLum_Mode and kDstInLum_Mode, to support CSS and SVG luminance masks (http://www.w3.org/TR/css-masking/#MaskValues , http://www.w3.org/TR/SVG/masking.html#Masking ).
The transfer coefficient is computed according to http://www.w3.org/TR/2011/REC-SVG11-20110816/filters.html#feColorMatrixElement "luminance-to-alpha":
luma = 0.2125 * r + 0.7154 * g + 0.0721 * b
R=bsalomon@google.com, reed@google.com, robertphillips@google.com, vandebo@chromium.org
Author: fmalita@chromium.org
Review URL: https://chromiumcodereview.appspot.com/22918012
git-svn-id: http://skia.googlecode.com/svn/trunk@10887 2bbb7eff-a529-9590-31e7-b0007b416f81
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2013-08-23 13:13:12 +00:00 |
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