Gamut transformation of the paint color in Ganesh

src/gpu/GrDrawContext.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBatchTest.h"
 #include "GrColor.h"
 #include "GrDrawContext.h"
@@ skipping 68 matching lines @@
                              sk_sp<SkColorSpace> colorSpace,
                              const SkSurfaceProps* surfaceProps,
                              GrAuditTrail* auditTrail,
                              GrSingleOwner* singleOwner)
     : fDrawingManager(drawingMgr)
     , fRenderTarget(std::move(rt))
     , fDrawTarget(SkSafeRef(fRenderTarget->getLastDrawTarget()))
     , fContext(context)
     , fInstancedPipelineInfo(fRenderTarget.get())
     , fColorSpace(std::move(colorSpace))
+    , fColorXformFromSRGB(nullptr)
     , fSurfaceProps(SkSurfacePropsCopyOrDefault(surfaceProps))
     , fAuditTrail(auditTrail)
 #ifdef SK_DEBUG
     , fSingleOwner(singleOwner)
 #endif
 {
+    if (fColorSpace) {
+        // sRGB sources are very common (SkColor, etc...), so we cache that gamut transformation
+        auto srgbColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
+        fColorXformFromSRGB = GrColorSpaceXform::Make(srgbColorSpace.get(), fColorSpace.get());
+    }
     SkDEBUGCODE(this->validate();)
 }
 
 #ifdef SK_DEBUG
 void GrDrawContext::validate() const {
     SkASSERT(fRenderTarget);
     ASSERT_OWNED_RESOURCE(fRenderTarget);
 
     if (fDrawTarget && !fDrawTarget->isClosed()) {
         SkASSERT(fRenderTarget->getLastDrawTarget() == fDrawTarget);
@@ skipping 1323 matching lines @@
 
 void GrDrawContext::drawBatch(const GrPipelineBuilder& pipelineBuilder, const GrClip& clip,
                               GrDrawBatch* batch) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(fAuditTrail, "GrDrawContext::drawBatch");
 
     this->getDrawTarget()->drawBatch(pipelineBuilder, this, clip, batch);
 }