Implement PaintRenderingContext2D off BaseRenderingContext2D

third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.cpp b/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c9da7ab97a53200d4d54569b5e46a3f253d159fb
--- /dev/null
+++ b/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.cpp
@@ -0,0 +1,72 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/csspaint/PaintRenderingContext2D.h"
+
+#include "platform/graphics/ImageBuffer.h"
+
+namespace blink {
+
+PaintRenderingContext2D::PaintRenderingContext2D(PassOwnPtr<ImageBuffer> imageBuffer)
+    : m_imageBuffer(imageBuffer)
+{
+    m_clipAntialiasing = AntiAliased;
+    modifiableState().setShouldAntialias(true);
+}
+
+int PaintRenderingContext2D::width() const
+{
+    ASSERT(m_imageBuffer);
+    return m_imageBuffer->size().width();
+}
+
+int PaintRenderingContext2D::height() const
+{
+    ASSERT(m_imageBuffer);
+    return m_imageBuffer->size().height();
+}
+
+bool PaintRenderingContext2D::parseColorOrCurrentColor(Color& color, const String& colorString) const
+{
+    // We ignore "currentColor" for PaintRenderingContext2D and just make it
+    // "black". "currentColor" can be emulated by having "color" as an input
+    // property for the css-paint-api.
+    // https://github.com/w3c/css-houdini-drafts/issues/133
+    return ::blink::parseColorOrCurrentColor(color, colorString, nullptr);
+}
+
+SkCanvas* PaintRenderingContext2D::drawingCanvas() const
+{
+    return m_imageBuffer->canvas();
+}
+
+SkCanvas* PaintRenderingContext2D::existingDrawingCanvas() const
+{
+    ASSERT(m_imageBuffer);
+    return m_imageBuffer->canvas();
+}
+
+AffineTransform PaintRenderingContext2D::baseTransform() const
+{
+    ASSERT(m_imageBuffer);
+    return m_imageBuffer->baseTransform();
+}
+
+void PaintRenderingContext2D::didDraw(const SkIRect& dirtyRect)
+{
+    ASSERT(m_imageBuffer);
+    return m_imageBuffer->didDraw(SkRect::Make(dirtyRect));
+}
+
+void PaintRenderingContext2D::validateStateStack()
+{
+#if ENABLE(ASSERT)
+    SkCanvas* skCanvas = existingDrawingCanvas();
+    if (skCanvas) {
+        ASSERT(static_cast<size_t>(skCanvas->getSaveCount()) == m_stateStack.size());
+    }
+#endif
+}
+
+} // namespace blink