float components in xfermodes

src/core/SkBlitter.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlitter.h"
 #include "SkAntiRun.h"
 #include "SkColor.h"
 #include "SkColorFilter.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMask.h"
 #include "SkMaskFilter.h"
 #include "SkString.h"
 #include "SkTLazy.h"
 #include "SkUtils.h"
 #include "SkXfermode.h"
 #include "SkXfermodeInterpretation.h"
 
+// define this for testing srgb blits
+//#define SK_SUPPORT_SRGB_RASTER
+
+#ifdef SK_SUPPORT_SRGB_RASTER
+    #define ALLOW_SRGB  true
+#else
+    #define ALLOW_SRGB  false
+#endif
+
 SkBlitter::~SkBlitter() {}
 
 bool SkBlitter::isNullBlitter() const { return false; }
 
 bool SkBlitter::resetShaderContext(const SkShader::ContextRec&) {
     return true;
 }
 
 SkShader::Context* SkBlitter::getShaderContext() const {
     return nullptr;
@@ skipping 866 matching lines @@
                 blitter = allocator->createT<SkA8_Blitter>(device, *paint);
             }
             break;
 
         case kRGB_565_SkColorType:
             blitter = SkBlitter_ChooseD565(device, *paint, shaderContext, allocator);
             break;
 
         case kN32_SkColorType:
             if (shader) {
-                blitter = allocator->createT<SkARGB32_Shader_Blitter>(
-                        device, *paint, shaderContext);
+                if (shaderContext->supports4f() && ALLOW_SRGB) {
+                    blitter = allocator->createT<SkARGB32_Shader4f_Blitter>(
+                                                                  device, *paint, shaderContext);
+                } else {
+                    blitter = allocator->createT<SkARGB32_Shader_Blitter>(
+                            device, *paint, shaderContext);
+                }
             } else if (paint->getColor() == SK_ColorBLACK) {
                 blitter = allocator->createT<SkARGB32_Black_Blitter>(device, *paint);
             } else if (paint->getAlpha() == 0xFF) {
                 blitter = allocator->createT<SkARGB32_Opaque_Blitter>(device, *paint);
             } else {
                 blitter = allocator->createT<SkARGB32_Blitter>(device, *paint);
             }
             break;
 
         default:
@@ skipping 53 matching lines @@
     fShaderContext->~Context();
     SkShader::Context* ctx = fShader->createContext(rec, (void*)fShaderContext);
     if (nullptr == ctx) {
         // Need a valid context in fShaderContext's storage, so we can later (or our caller) call
         // the in-place destructor.
         new (fShaderContext) SkZeroShaderContext(*fShader, rec);
         return false;
     }
     return true;
 }