Require sRGB write control for sRGB support. Add flag to GrPaint to suppress linear -> sRGB convers…

include/gpu/GrCaps.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrCaps_DEFINED
 #define GrCaps_DEFINED
 
@@ skipping 119 matching lines @@
     GrCaps(const GrContextOptions&);
 
     virtual SkString dump() const;
 
     GrShaderCaps* shaderCaps() const { return fShaderCaps; }
 
     bool npotTextureTileSupport() const { return fNPOTTextureTileSupport; }
     /** To avoid as-yet-unnecessary complexity we don't allow any partial support of MIP Maps (e.g.
         only for POT textures) */
     bool mipMapSupport() const { return fMipMapSupport; }
+
+    /**
+     * Skia convention is that a device only has sRGB support if it supports sRGB formats for both
+     * textures and framebuffers. In addition:
+     *   Decoding to linear of an sRGB texture can be disabled.
+     *   Encoding and gamma-correct blending to an sRGB framebuffer can be disabled.
+     */
     bool srgbSupport() const { return fSRGBSupport; }
     bool twoSidedStencilSupport() const { return fTwoSidedStencilSupport; }
     bool stencilWrapOpsSupport() const { return  fStencilWrapOpsSupport; }
     bool discardRenderTargetSupport() const { return fDiscardRenderTargetSupport; }
     bool gpuTracingSupport() const { return fGpuTracingSupport; }
     bool compressedTexSubImageSupport() const { return fCompressedTexSubImageSupport; }
     bool oversizedStencilSupport() const { return fOversizedStencilSupport; }
     bool textureBarrierSupport() const { return fTextureBarrierSupport; }
     bool sampleLocationsSupport() const { return fSampleLocationsSupport; }
     bool usesMixedSamples() const { return fUsesMixedSamples; }
@@ skipping 165 matching lines @@
     virtual void onApplyOptionsOverrides(const GrContextOptions&) {};
 
     bool fSuppressPrints : 1;
     bool fImmediateFlush: 1;
     bool fDrawPathMasksToCompressedTextureSupport : 1;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif