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commit-bot@chromium.org authored
Update comment in header to make it more clear that the picture should be unaltered after creating the shader. We want our shaders to be immutable, and this supports that. Make the factory return NULL if the shader would have never drawn anyway i.e. for a null picture or picture with no width/height. Addresses comments I brought up in https://codereview.chromium.org/221923007/#msg16. BUG=skia:1976 R=reed@google.com, fmalita@chromium.org, robertphillips@google.com Author: scroggo@google.com Review URL: https://codereview.chromium.org/238253005 git-svn-id: http://skia.googlecode.com/svn/trunk@14288 2bbb7eff-a529-9590-31e7-b0007b416f81
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