mix-blend-mode implementation for accelerated layers

cc/trees/layer_tree_host_pixeltest_blending.cc

Index: cc/trees/layer_tree_host_pixeltest_blending.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_blending.cc b/cc/trees/layer_tree_host_pixeltest_blending.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7a492a1d5bfde2cc2e11afa89d82057645b60256
--- /dev/null
+++ b/cc/trees/layer_tree_host_pixeltest_blending.cc
@@ -0,0 +1,120 @@
+// 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.
+
+#include "cc/layers/solid_color_layer.h"
+#include "cc/layers/texture_layer.h"
+#include "cc/test/layer_tree_pixel_test.h"
+
+#if !defined(OS_ANDROID)
+
+namespace cc {
+namespace {
+
+SkXfermode::Mode const kBlendModes[] = {
+    SkXfermode::kSrcOver_Mode,   SkXfermode::kScreen_Mode,
+    SkXfermode::kOverlay_Mode,   SkXfermode::kDarken_Mode,
+    SkXfermode::kLighten_Mode,   SkXfermode::kColorDodge_Mode,
+    SkXfermode::kColorBurn_Mode, SkXfermode::kHardLight_Mode,
+    SkXfermode::kSoftLight_Mode, SkXfermode::kDifference_Mode,
+    SkXfermode::kExclusion_Mode, SkXfermode::kMultiply_Mode,
+    SkXfermode::kHue_Mode,       SkXfermode::kSaturation_Mode,
+    SkXfermode::kColor_Mode,     SkXfermode::kLuminosity_Mode};
+
+const int kBlendModesCount = arraysize(kBlendModes);
+
+class LayerTreeHostBlendingPixelTest : public LayerTreePixelTest {
+ protected:
+  void RunBlendingWithRootPixelTestType(PixelTestType type) {
+    const int kLaneWidth = 15;
+    const int kLaneHeight = kBlendModesCount * kLaneWidth;
+    const int kRootSize = (kBlendModesCount + 2) * kLaneWidth;
+
+    scoped_refptr<SolidColorLayer> background =
+        CreateSolidColorLayer(gfx::Rect(kRootSize, kRootSize), kCSSOrange);
+
+    // Orange child layers will blend with the green background
+    for (int i = 0; i < kBlendModesCount; ++i) {
+      gfx::Rect child_rect(
+          (i + 1) * kLaneWidth, kLaneWidth, kLaneWidth, kLaneHeight);
+      scoped_refptr<SolidColorLayer> green_lane =
+          CreateSolidColorLayer(child_rect, kCSSGreen);
+      background->AddChild(green_lane);
+      green_lane->SetBlendMode(kBlendModes[i]);
+    }
+
+    RunPixelTest(type,
+                 background,
+                 base::FilePath(FILE_PATH_LITERAL("blending_with_root.png")));
+  }
+
+  void RunBlendingWithTransparentPixelTestType(PixelTestType type) {
+    const int kLaneWidth = 15;
+    const int kLaneHeight = kBlendModesCount * kLaneWidth;
+    const int kRootSize = (kBlendModesCount + 2) * kLaneWidth;
+
+    scoped_refptr<SolidColorLayer> root =
+        CreateSolidColorLayer(gfx::Rect(kRootSize, kRootSize), kCSSBrown);
+
+    scoped_refptr<SolidColorLayer> background = CreateSolidColorLayer(
+        gfx::Rect(0, kLaneWidth * 2, kRootSize, kLaneWidth), kCSSOrange);
+
+    root->AddChild(background);
+    background->SetIsRootForIsolatedGroup(true);
+
+    // Orange child layers will blend with the green background
+    for (int i = 0; i < kBlendModesCount; ++i) {
+      gfx::Rect child_rect(
+          (i + 1) * kLaneWidth, -kLaneWidth, kLaneWidth, kLaneHeight);
+      scoped_refptr<SolidColorLayer> green_lane =
+          CreateSolidColorLayer(child_rect, kCSSGreen);
+      background->AddChild(green_lane);
+      green_lane->SetBlendMode(kBlendModes[i]);
+    }
+
+    RunPixelTest(type,
+                 root,
+                 base::FilePath(FILE_PATH_LITERAL("blending_transparent.png")));
+  }
+};
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRoot_GL) {
+  RunBlendingWithRootPixelTestType(GL_WITH_BITMAP);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithBackgroundFilter) {
+  const int kLaneWidth = 15;
+  const int kLaneHeight = kBlendModesCount * kLaneWidth;
+  const int kRootSize = (kBlendModesCount + 2) * kLaneWidth;
+
+  scoped_refptr<SolidColorLayer> background =
+      CreateSolidColorLayer(gfx::Rect(kRootSize, kRootSize), kCSSOrange);
+
+  // Orange child layers have a background filter set and they will blend with
+  // the green background
+  for (int i = 0; i < kBlendModesCount; ++i) {
+    gfx::Rect child_rect(
+        (i + 1) * kLaneWidth, kLaneWidth, kLaneWidth, kLaneHeight);
+    scoped_refptr<SolidColorLayer> green_lane =
+        CreateSolidColorLayer(child_rect, kCSSGreen);
+    background->AddChild(green_lane);
+
+    FilterOperations filters;
+    filters.Append(FilterOperation::CreateGrayscaleFilter(.75));
+    green_lane->SetBackgroundFilters(filters);
+    green_lane->SetBlendMode(kBlendModes[i]);
+  }
+
+  RunPixelTest(GL_WITH_BITMAP,
+               background,
+               base::FilePath(FILE_PATH_LITERAL("blending_and_filter.png")));
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithTransparent_GL) {
+  RunBlendingWithTransparentPixelTestType(GL_WITH_BITMAP);
+}
+
+}  // namespace
+}  // namespace cc
+
+#endif  // OS_ANDROID