Implements core logic for Pixel Canvas

cc/raster/raster_source_unittest.cc

Index: cc/raster/raster_source_unittest.cc
diff --git a/cc/raster/raster_source_unittest.cc b/cc/raster/raster_source_unittest.cc
index d4c878217cb80d3f529bd18de16346f00327eac8..3c057e85ffd06d249343b66dbca2855e73964a97 100644
--- a/cc/raster/raster_source_unittest.cc
+++ b/cc/raster/raster_source_unittest.cc
@@ -97,6 +97,91 @@ TEST(RasterSourceTest, AnalyzeIsSolidUnscaled) {
   EXPECT_EQ(solid_color, color);
 }
 
+TEST(RasterSourceTest, AnalyzeIsSolidScaled) {
+  gfx::Size layer_bounds(400, 400);
+  const std::vector<float> recording_scales = {1.25f, 1.33f, 1.5f,  1.6f,
+                                               1.66f, 2.f,   2.25f, 2.5f};
+  for (float recording_scale : recording_scales) {
+    std::unique_ptr<FakeRecordingSource> recording_source =
+        FakeRecordingSource::CreateFilledRecordingSource(layer_bounds);
+    recording_source->SetRecordingScaleFactor(recording_scale);
+
+    PaintFlags solid_flags;
+    SkColor solid_color = SkColorSetARGB(255, 12, 23, 34);
+    solid_flags.setColor(solid_color);
+
+    SkColor non_solid_color = SkColorSetARGB(128, 45, 56, 67);
+    SkColor color = SK_ColorTRANSPARENT;
+    PaintFlags non_solid_flags;
+    bool is_solid_color = false;
+    non_solid_flags.setColor(non_solid_color);
+
+    recording_source->add_draw_rect_with_flags(
+        gfx::ScaleToEnclosingRect(gfx::Rect(layer_bounds), recording_scale),
+        solid_flags);
+    recording_source->Rerecord();
+
+    scoped_refptr<RasterSource> raster =
+        RasterSource::CreateFromRecordingSource(recording_source.get(), false);
+
+    // Ensure everything is solid.
+    for (int y = 0; y <= 300; y += 100) {
+      for (int x = 0; x <= 300; x += 100) {
+        gfx::Rect rect(x, y, 100, 100);
+        is_solid_color = raster->PerformSolidColorAnalysis(rect, &color);
+        EXPECT_TRUE(is_solid_color)
+            << rect.ToString() << " recording_scale: " << recording_scale;
+        EXPECT_EQ(solid_color, color)
+            << rect.ToString() << " recording_scale: " << recording_scale;
+      }
+    }
+
+    // Add one non-solid pixel and recreate the raster source.
+    recording_source->add_draw_rect_with_flags(
+        gfx::Rect(std::round(50 * recording_scale),
+                  std::round(50 * recording_scale), 1, 1),
+        non_solid_flags);
+    recording_source->Rerecord();
+    raster =
+        RasterSource::CreateFromRecordingSource(recording_source.get(), false);
+
+    color = SK_ColorTRANSPARENT;
+    is_solid_color =
+        raster->PerformSolidColorAnalysis(gfx::Rect(0, 0, 100, 100), &color);
+    EXPECT_FALSE(is_solid_color) << " recording_scale: " << recording_scale;
+
+    color = SK_ColorTRANSPARENT;
+    is_solid_color =
+        raster->PerformSolidColorAnalysis(gfx::Rect(0, 0, 51, 51), &color);
+    EXPECT_FALSE(is_solid_color) << " recording_scale: " << recording_scale;
+
+    color = SK_ColorTRANSPARENT;
+    is_solid_color =
+        raster->PerformSolidColorAnalysis(gfx::Rect(51, 0, 100, 100), &color);
+    EXPECT_TRUE(is_solid_color) << " recording_scale: " << recording_scale;
+    EXPECT_EQ(solid_color, color) << " recording_scale: " << recording_scale;
+
+    // Boundaries should be clipped.
+    color = SK_ColorTRANSPARENT;
+    is_solid_color =
+        raster->PerformSolidColorAnalysis(gfx::Rect(350, 0, 100, 100), &color);
+    EXPECT_TRUE(is_solid_color) << " recording_scale: " << recording_scale;
+    EXPECT_EQ(solid_color, color) << " recording_scale: " << recording_scale;
+
+    color = SK_ColorTRANSPARENT;
+    is_solid_color =
+        raster->PerformSolidColorAnalysis(gfx::Rect(0, 350, 100, 100), &color);
+    EXPECT_TRUE(is_solid_color) << " recording_scale: " << recording_scale;
+    EXPECT_EQ(solid_color, color) << " recording_scale: " << recording_scale;
+
+    color = SK_ColorTRANSPARENT;
+    is_solid_color = raster->PerformSolidColorAnalysis(
+        gfx::Rect(350, 350, 100, 100), &color);
+    EXPECT_TRUE(is_solid_color) << " recording_scale: " << recording_scale;
+    EXPECT_EQ(solid_color, color) << " recording_scale: " << recording_scale;
+  }
+}
+
 TEST(RasterSourceTest, PixelRefIteratorDiscardableRefsOneTile) {
   gfx::Size layer_bounds(512, 512);