commit 9e3f1bf4e5cd8fc59554f986f36d6b034e99f9eb
author brianosman <brianosman@google.com> Thu Mar 17 12:26:37 2016 -0700
committer Commit bot <commit-bot@chromium.org> Thu Mar 17 12:26:37 2016 -0700
tree 15fc5d36dc3c97fbcb8e634d23f3a87fe48685bc
parent 0e3129d734212089f872f0e7de8f2537861a3f89

sRGB support in Ganesh. Several pieces:

sRGB support now also requires GL_EXT_texture_sRGB_decode, which allows
us to disable sRGB -> Linear conversion when reading textures. This gives
us an easy way to support "legacy" L32 mode. We disable decoding based on
the pixel config of the render target. Textures can override that behavior
(specifically for format-conversion draws where we want that behavior).

Added sBGRA pixel config, which is not-really-a-format. It's just sRGBA
internally, and the external format is BGR order, so TexImage calls will
swizzle correctly. This lets us interact with sRGB raster surfaces on BGR
platforms.

Devices without sRGB support behave like they always have: conversion from
color type and profile type ignores sRGB and always returns linear pixel
configs.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1789663002

Review URL: https://codereview.chromium.org/1789663002