Retire setGradientSpaceTransform, setPatternSpaceTransform

third_party/WebKit/Source/platform/graphics/Pattern.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2013 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 42 matching lines @@
     , m_externalMemoryAllocated(0)
 {
     adjustExternalMemoryAllocated(externalMemoryAllocated);
 }
 
 Pattern::~Pattern()
 {
     adjustExternalMemoryAllocated(-m_externalMemoryAllocated);
 }
 
-void Pattern::applyToPaint(SkPaint& paint)
+namespace {
+
+inline bool cachedShaderIsValid(const sk_sp<SkShader>& shader, const SkMatrix* matrix)
 {
-    if (!m_pattern)
-        m_pattern = createShader();
+    if (!shader)
+        return false;
 
-    paint.setShader(m_pattern);
+    const SkMatrix& shaderLocalMatrix = shader->getLocalMatrix();
+    if (!matrix)
+        return shaderLocalMatrix.isIdentity();
+
+    return shaderLocalMatrix == *matrix;
 }
 
-void Pattern::setPatternSpaceTransform(const AffineTransform& patternSpaceTransformation)
+} // anonymous namespace
+
+void Pattern::applyToPaint(SkPaint& paint, const SkMatrix* localMatrix) const
 {
-    if (patternSpaceTransformation == m_patternSpaceTransformation)
-        return;
+    if (!cachedShaderIsValid(m_cachedShader, localMatrix))
+        m_cachedShader = createShader(localMatrix);
 
-    m_patternSpaceTransformation = patternSpaceTransformation;
-    m_pattern.reset();
+    paint.setShader(m_cachedShader);
 }
 
 void Pattern::adjustExternalMemoryAllocated(int64_t delta)
 {
     delta = std::max(-m_externalMemoryAllocated, delta);
 
     v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(delta);
 
     m_externalMemoryAllocated += delta;
 }
 
 } // namespace blink