Optimize alpha software PictureDrawQuads.

skia/ext/alpha_proxy_canvas.h

+// Copyright (c) 2013 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.
+
+#ifndef SKIA_EXT_ALPHA_PROXY_CANVAS_H_
+#define SKIA_EXT_ALPHA_PROXY_CANVAS_H_
+
+#include "base/compiler_specific.h"
+#include "third_party/skia/include/utils/SkProxyCanvas.h"
+
+namespace skia {
+
+class SK_API AlphaProxyCanvas : public SkProxyCanvas {
+ public:
+  AlphaProxyCanvas(SkCanvas* target, float opacity, bool allow_filter);
+  virtual ~AlphaProxyCanvas();
+
+  virtual int saveLayer(const SkRect* bounds,
+                        const SkPaint* paint,
+                        SkCanvas::SaveFlags flags) OVERRIDE;
+  virtual void drawPaint(const SkPaint& paint) OVERRIDE;
+  virtual void drawPoints(SkCanvas::PointMode mode,
+                          size_t count,
+                          const SkPoint pts[],
+                          const SkPaint& paint) OVERRIDE;
+  virtual void drawRect(const SkRect& rect, const SkPaint& paint) OVERRIDE;
+  virtual void drawOval(const SkRect& oval, const SkPaint& paint) OVERRIDE;
+  virtual void drawRRect(const SkRRect& rrect, const SkPaint& paint) OVERRIDE;
+  virtual void drawPath(const SkPath& path, const SkPaint& paint) OVERRIDE;
+  virtual void drawBitmap(const SkBitmap& bitmap,
+                          SkScalar left,
+                          SkScalar top,
+                          const SkPaint* paint) OVERRIDE;
+  virtual void drawBitmapRectToRect(const SkBitmap& bitmap,
+                                    const SkRect* src,
+                                    const SkRect& dst,
+                                    const SkPaint* paint,
+                                    DrawBitmapRectFlags flags) OVERRIDE;
+  virtual void drawBitmapMatrix(const SkBitmap& bitmap,
+                                const SkMatrix& m,
+                                const SkPaint* paint) OVERRIDE;
+  virtual void drawBitmapNine(const SkBitmap& bitmap,
+                              const SkIRect& center,
+                              const SkRect& dst,
+                              const SkPaint* paint) OVERRIDE;
+  virtual void drawSprite(const SkBitmap& bitmap,
+                          int left,
+                          int top,
+                          const SkPaint* paint) OVERRIDE;
+  virtual void drawText(const void* text,
+                        size_t byteLength,
+                        SkScalar x,
+                        SkScalar y,
+                        const SkPaint& paint) OVERRIDE;
+  virtual void drawPosText(const void* text,
+                           size_t byteLength,
+                           const SkPoint pos[],
+                           const SkPaint& paint) OVERRIDE;
+  virtual void drawPosTextH(const void* text,
+                            size_t byteLength,
+                            const SkScalar xpos[],
+                            SkScalar constY,
+                            const SkPaint& paint) OVERRIDE;
+  virtual void drawTextOnPath(const void* text,
+                              size_t byteLength,
+                              const SkPath& path,
+                              const SkMatrix* matrix,
+                              const SkPaint& paint) OVERRIDE;
+  virtual void drawVertices(SkCanvas::VertexMode vmode,
+                            int vertexCount,
+                            const SkPoint vertices[],
+                            const SkPoint texs[],
+                            const SkColor colors[],
+                            SkXfermode* xmode,
+                            const uint16_t indices[],
+                            int indexCount,
+                            const SkPaint& paint) OVERRIDE;
+
+ private:
+  typedef SkProxyCanvas INHERITED;
+
+  SkPaint AlphaPaint(const SkPaint* paint) const;
+
+  float opacity_;
+  bool allow_filter_;
+};
+
+}  // namespace skia
+
+#endif  // SKIA_EXT_ALPHA_PROXY_CANVAS_H_
+