mix-blend-mode implementation for accelerated layers

webkit/renderer/compositor_bindings/web_blend_mode.h

+// Copyright 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 WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_BLEND_MODE_H_
+#define WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_BLEND_MODE_H_
+
+#include "third_party/WebKit/public/platform/WebBlendMode.h"
+
+namespace webkit {
+
+inline SkXfermode::Mode BlendModeToSkia(WebKit::WebBlendMode blend_mode) {
+  switch (blend_mode) {
+    case WebKit::WebBlendModeNormal:
+      return SkXfermode::kSrcOver_Mode;
+    case WebKit::WebBlendModeMultiply:
+      return SkXfermode::kMultiply_Mode;
+    case WebKit::WebBlendModeScreen:
+      return SkXfermode::kScreen_Mode;
+    case WebKit::WebBlendModeOverlay:
+      return SkXfermode::kOverlay_Mode;
+    case WebKit::WebBlendModeDarken:
+      return SkXfermode::kDarken_Mode;
+    case WebKit::WebBlendModeLighten:
+      return SkXfermode::kLighten_Mode;
+    case WebKit::WebBlendModeColorDodge:
+      return SkXfermode::kColorDodge_Mode;
+    case WebKit::WebBlendModeColorBurn:
+      return SkXfermode::kColorBurn_Mode;
+    case WebKit::WebBlendModeHardLight:
+      return SkXfermode::kHardLight_Mode;
+    case WebKit::WebBlendModeSoftLight:
+      return SkXfermode::kSoftLight_Mode;
+    case WebKit::WebBlendModeDifference:
+      return SkXfermode::kDifference_Mode;
+    case WebKit::WebBlendModeExclusion:
+      return SkXfermode::kExclusion_Mode;
+    case WebKit::WebBlendModeHue:
+      return SkXfermode::kHue_Mode;
+    case WebKit::WebBlendModeSaturation:
+      return SkXfermode::kSaturation_Mode;
+    case WebKit::WebBlendModeColor:
+      return SkXfermode::kColor_Mode;
+    case WebKit::WebBlendModeLuminosity:
+      return SkXfermode::kLuminosity_Mode;
+    default:
+      NOTREACHED();
+  }
+  return SkXfermode::kSrcOver_Mode;
+}
+
+inline WebKit::WebBlendMode BlendModeFromSkia(SkXfermode::Mode blend_mode) {
+  switch (blend_mode) {
+    case SkXfermode::kSrcOver_Mode:
+      return WebKit::WebBlendModeNormal;
+    case SkXfermode::kMultiply_Mode:
+      return WebKit::WebBlendModeMultiply;
+    case SkXfermode::kScreen_Mode:
+      return WebKit::WebBlendModeScreen;
+    case SkXfermode::kOverlay_Mode:
+      return WebKit::WebBlendModeOverlay;
+    case SkXfermode::kDarken_Mode:
+      return WebKit::WebBlendModeDarken;
+    case SkXfermode::kLighten_Mode:
+      return WebKit::WebBlendModeLighten;
+    case SkXfermode::kColorDodge_Mode:
+      return WebKit::WebBlendModeColorDodge;
+    case SkXfermode::kColorBurn_Mode:
+      return WebKit::WebBlendModeColorBurn;
+    case SkXfermode::kHardLight_Mode:
+      return WebKit::WebBlendModeHardLight;
+    case SkXfermode::kSoftLight_Mode:
+      return WebKit::WebBlendModeSoftLight;
+    case SkXfermode::kDifference_Mode:
+      return WebKit::WebBlendModeDifference;
+    case SkXfermode::kExclusion_Mode:
+      return WebKit::WebBlendModeExclusion;
+    case SkXfermode::kHue_Mode:
+      return WebKit::WebBlendModeHue;
+    case SkXfermode::kSaturation_Mode:
+      return WebKit::WebBlendModeSaturation;
+    case SkXfermode::kColor_Mode:
+      return WebKit::WebBlendModeColor;
+    case SkXfermode::kLuminosity_Mode:
+      return WebKit::WebBlendModeLuminosity;
+    default:
+      NOTREACHED();
+  }
+  return WebKit::WebBlendModeNormal;
+}
+
+}  // namespace webkit
+
+#endif  // WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_BLEND_MODE_H_