Adding more cc pixel tests using blend modes.

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
index f01d426c614d58e2ac8d0b7808e0a0778bd02f9f..6845749052f78f601d02c1618afd0a803c234a29 100644
--- a/cc/trees/layer_tree_host_pixeltest_blending.cc
+++ b/cc/trees/layer_tree_host_pixeltest_blending.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "cc/layers/image_layer.h"
 #include "cc/layers/solid_color_layer.h"
-#include "cc/layers/texture_layer.h"
 #include "cc/test/layer_tree_pixel_test.h"
 #include "cc/test/pixel_comparator.h"
 
@@ -22,7 +22,36 @@ SkXfermode::Mode const kBlendModes[] = {
     SkXfermode::kHue_Mode,       SkXfermode::kSaturation_Mode,
     SkXfermode::kColor_Mode,     SkXfermode::kLuminosity_Mode};
 
+SkColor kCSSTestColors[] = {
+    0xffff0000,  // red
+    0xff00ff00,  // lime
+    0xff0000ff,  // blue
+    0xff00ffff,  // aqua
+    0xffff00ff,  // fuchsia
+    0xffffff00,  // yellow
+    0xff008000,  // green
+    0xff800000,  // maroon
+    0xff000080,  // navy
+    0xff800080,  // purple
+    0xff808000,  // olive
+    0xff008080,  // teal
+    0xfffa8072,  // salmon
+    0xffc0c0c0,  // silver
+    0xff000000,  // black
+    0xff808080,  // gray
+    0x80000000,  // black with transparency
+    0xffffffff,  // white
+    0x80ffffff,  // white with transparency
+    0x00000000   // transparent
+};
+
 const int kBlendModesCount = arraysize(kBlendModes);
+const int kCSSTestColorsCount = arraysize(kCSSTestColors);
+
+using RenderPassOptions = uint32;
+const uint32 kUseMasks = 1 << 0;
+const uint32 kUseAntialiasing = 1 << 1;
+const uint32 kUseColorMatrix = 1 << 2;
 
 class LayerTreeHostBlendingPixelTest : public LayerTreePixelTest {
  public:
@@ -82,6 +111,147 @@ class LayerTreeHostBlendingPixelTest : public LayerTreePixelTest {
                  root,
                  base::FilePath(FILE_PATH_LITERAL("blending_transparent.png")));
   }
+
+  scoped_refptr<Layer> CreateColorfulBackdropLayer(int width, int height) {
+    // Draw the backdrop with horizontal lanes.
+    const int kLaneWidth = width;
+    const int kLaneHeight = height / kCSSTestColorsCount;
+    SkBitmap backing_store;
+    backing_store.allocN32Pixels(width, height);
+    SkCanvas canvas(backing_store);
+    canvas.clear(SK_ColorTRANSPARENT);
+    for (int i = 0; i < kCSSTestColorsCount; ++i) {
+      SkPaint paint;
+      paint.setColor(kCSSTestColors[i]);
+      canvas.drawRect(
+          SkRect::MakeXYWH(0, i * kLaneHeight, kLaneWidth, kLaneHeight), paint);
+    }
+    scoped_refptr<ImageLayer> layer = ImageLayer::Create();
+    layer->SetIsDrawable(true);
+    layer->SetBounds(gfx::Size(width, height));
+    layer->SetBitmap(backing_store);
+    return layer;
+  }
+
+  void SetupMaskLayer(scoped_refptr<Layer> layer) {
+    const int kMaskOffset = 5;
+    gfx::Size bounds = layer->bounds();
+    scoped_refptr<ImageLayer> mask = ImageLayer::Create();
+    mask->SetIsDrawable(true);
+    mask->SetIsMask(true);
+    mask->SetBounds(bounds);
+
+    SkBitmap bitmap;
+    bitmap.allocN32Pixels(bounds.width(), bounds.height());
+    SkCanvas canvas(bitmap);
+    SkPaint paint;
+    paint.setColor(SK_ColorWHITE);
+    canvas.clear(SK_ColorTRANSPARENT);
+    canvas.drawRect(SkRect::MakeXYWH(kMaskOffset,
+                                     kMaskOffset,
+                                     bounds.width() - kMaskOffset * 2,
+                                     bounds.height() - kMaskOffset * 2),
+                    paint);
+    mask->SetBitmap(bitmap);
+    layer->SetMaskLayer(mask.get());
+  }
+
+  void SetupAntiAliasing(scoped_refptr<Layer> layer) {
+    gfx::Transform rotation;
+    rotation.RotateAboutZAxis(5.0);

[enne (OOO), 2014/10/07 19:57:58]

There's already some pixel tests for general antialiasing and render passes. 
What code changes related to blend modes when antialiasing occurs?  Is this a
configuration that needs specific testing?

[rosca, 2014/10/07 21:30:29]

These tests are going to cover each type of shader that can be set on a render
pass. We already have tests for antialiasing, but only this test will touch the
blending code inside the antialiasing shader.

+    layer->SetTransform(rotation);
+  }
+
+  void SetupColorMatrix(scoped_refptr<Layer> layer) {
+    FilterOperations filter_operations;
+    filter_operations.Append(FilterOperation::CreateSepiaFilter(1.f));
+    layer->SetFilters(filter_operations);
+  }
+
+  void CreateBlendingColorLayers(int width,
+                                 int height,
+                                 scoped_refptr<Layer> background,
+                                 RenderPassOptions flags) {
+    const int kLanesCount = kBlendModesCount + 4;
+    const int kLaneWidth = width / kLanesCount;
+    const int kLaneHeight = height;
+    const SkColor kMiscOpaqueColor = 0xffc86464;
+    const SkColor kMiscTransparentColor = 0x80c86464;
+    const SkXfermode::Mode kCoeffBlendMode = SkXfermode::kScreen_Mode;
+    const SkXfermode::Mode kShaderBlendMode = SkXfermode::kColorBurn_Mode;
+    // add vertical lanes with each of the blend modes
+    for (int i = 0; i < kLanesCount; ++i) {
+      gfx::Rect child_rect(i * kLaneWidth, 0, kLaneWidth, kLaneHeight);
+      SkXfermode::Mode blend_mode = SkXfermode::kSrcOver_Mode;
+      float opacity = 1.f;
+      SkColor color = kMiscOpaqueColor;
+
+      if (i < kBlendModesCount) {
+        blend_mode = kBlendModes[i];
+      } else if (i == kBlendModesCount) {
+        blend_mode = kCoeffBlendMode;
+        opacity = 0.5f;
+      } else if (i == kBlendModesCount + 1) {
+        blend_mode = kCoeffBlendMode;
+        color = kMiscTransparentColor;
+      } else if (i == kBlendModesCount + 2) {
+        blend_mode = kShaderBlendMode;
+        opacity = 0.5f;
+      } else if (i == kBlendModesCount + 3) {
+        blend_mode = kShaderBlendMode;
+        color = kMiscTransparentColor;
+      }
+
+      scoped_refptr<SolidColorLayer> lane =
+          CreateSolidColorLayer(child_rect, color);
+      lane->SetBlendMode(blend_mode);
+      lane->SetOpacity(opacity);
+      lane->SetForceRenderSurface(true);
+      if (flags & kUseMasks)
+        SetupMaskLayer(lane);
+      if (flags & kUseAntialiasing)
+        SetupAntiAliasing(lane);
+      if (flags & kUseColorMatrix) {
+        SetupColorMatrix(lane);
+      }
+      background->AddChild(lane);
+    }
+  }
+
+  void RunBlendingWithRenderPass(PixelTestType type,
+                                 const base::FilePath::CharType* expected_path,
+                                 RenderPassOptions flags) {
+    const int kRootSize = 400;
+
+    scoped_refptr<SolidColorLayer> root =
+        CreateSolidColorLayer(gfx::Rect(kRootSize, kRootSize), SK_ColorWHITE);
+    scoped_refptr<Layer> background =
+        CreateColorfulBackdropLayer(kRootSize, kRootSize);
+
+    background->SetIsRootForIsolatedGroup(true);
+    root->AddChild(background);
+
+    CreateBlendingColorLayers(kRootSize, kRootSize, background.get(), flags);
+
+    this->impl_side_painting_ = false;
+
+#if defined(OS_WIN)
+    float percentage_pixels_large_error = 2.f;  // max 3200px / (400*400)
+    float percentage_pixels_small_error = 0.0f;
+    float average_error_allowed_in_bad_pixels = 1.f;
+    int large_error_allowed = 3;
+    int small_error_allowed = 0;
+    pixel_comparator_.reset(
+        new FuzzyPixelComparator(true,  // discard_alpha
+                                 percentage_pixels_large_error,
+                                 percentage_pixels_small_error,
+                                 average_error_allowed_in_bad_pixels,
+                                 large_error_allowed,
+                                 small_error_allowed));
+#endif
+
+    RunPixelTest(type, root, base::FilePath(expected_path));
+  }
 };
 
 TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRoot_GL) {
@@ -128,6 +298,117 @@ TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithTransparent_Software) {
   RunBlendingWithTransparentPixelTestType(SOFTWARE_WITH_BITMAP);
 }
 
+// Tests for render passes
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPass_GL) {
+  RunBlendingWithRenderPass(
+      GL_WITH_BITMAP, FILE_PATH_LITERAL("blending_render_pass_gl.png"), 0);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPass_Software) {
+  RunBlendingWithRenderPass(
+      SOFTWARE_WITH_BITMAP, FILE_PATH_LITERAL("blending_render_pass.png"), 0);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassAA_GL) {
+  RunBlendingWithRenderPass(GL_WITH_BITMAP,
+                            FILE_PATH_LITERAL("blending_render_pass_aa_gl.png"),
+                            kUseAntialiasing);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassAA_Software) {
+  RunBlendingWithRenderPass(SOFTWARE_WITH_BITMAP,
+                            FILE_PATH_LITERAL("blending_render_pass_aa.png"),
+                            kUseAntialiasing);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassWithMask_GL) {
+  RunBlendingWithRenderPass(
+      GL_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_gl.png"),
+      kUseMasks);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassWithMask_Software) {
+  RunBlendingWithRenderPass(SOFTWARE_WITH_BITMAP,
+                            FILE_PATH_LITERAL("blending_render_pass_mask.png"),
+                            kUseMasks);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassWithMaskAA_GL) {
+  RunBlendingWithRenderPass(
+      GL_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_aa_gl.png"),
+      kUseMasks | kUseAntialiasing);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassWithMaskAA_Software) {
+  RunBlendingWithRenderPass(
+      SOFTWARE_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_aa.png"),
+      kUseMasks | kUseAntialiasing);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassColorMatrix_GL) {
+  RunBlendingWithRenderPass(GL_WITH_BITMAP,
+                            FILE_PATH_LITERAL("blending_render_pass_cm_gl.png"),
+                            kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassColorMatrix_Software) {
+  RunBlendingWithRenderPass(SOFTWARE_WITH_BITMAP,
+                            FILE_PATH_LITERAL("blending_render_pass_cm.png"),
+                            kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest, BlendingWithRenderPassAAColorMatrix_GL) {
+  RunBlendingWithRenderPass(
+      GL_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_aa_cm_gl.png"),
+      kUseAntialiasing | kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassAAColorMatrix_Software) {
+  RunBlendingWithRenderPass(SOFTWARE_WITH_BITMAP,
+                            FILE_PATH_LITERAL("blending_render_pass_aa_cm.png"),
+                            kUseAntialiasing | kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassWithMaskColorMatrix_GL) {
+  RunBlendingWithRenderPass(
+      GL_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_cm_gl.png"),
+      kUseMasks | kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassWithMaskColorMatrix_Software) {
+  RunBlendingWithRenderPass(
+      SOFTWARE_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_cm.png"),
+      kUseMasks | kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassWithMaskAAColorMatrix_GL) {
+  RunBlendingWithRenderPass(
+      GL_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_aa_cm_gl.png"),
+      kUseMasks | kUseAntialiasing | kUseColorMatrix);
+}
+
+TEST_F(LayerTreeHostBlendingPixelTest,
+       BlendingWithRenderPassWithMaskAAColorMatrix_Software) {
+  RunBlendingWithRenderPass(
+      SOFTWARE_WITH_BITMAP,
+      FILE_PATH_LITERAL("blending_render_pass_mask_aa_cm.png"),
+      kUseMasks | kUseAntialiasing | kUseColorMatrix);
+}
+
 }  // namespace
 }  // namespace cc