cc: Add layer-based pixel tests.

cc/test/layer_tree_pixel_test.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.
+
+#include "base/files/file_path.h"
+#include "cc/solid_color_layer.h"
+#include "cc/test/layer_tree_test_common.h"
+
+#ifndef CC_TEST_LAYER_TREE_PIXEL_TEST_H_
+#define CC_TEST_LAYER_TREE_PIXEL_TEST_H_
+
+namespace cc {
+class LayerTreeHost;
+
+class LayerTreePixelTest : public ThreadedTest {
+ protected:
+  LayerTreePixelTest();
+  virtual ~LayerTreePixelTest();
+
+  bool RunTest(scoped_refptr<Layer> root_layer,
+               const base::FilePath::StringType& file_name);
+
+  virtual scoped_ptr<OutputSurface> createOutputSurface() OVERRIDE;
+  virtual scoped_refptr<cc::ContextProvider>
+      OffscreenContextProviderForMainThread() OVERRIDE;
+  virtual scoped_refptr<cc::ContextProvider>
+      OffscreenContextProviderForCompositorThread() OVERRIDE;
+  virtual void swapBuffersOnThread(LayerTreeHostImpl* host_impl,
+                                   bool result) OVERRIDE;
+
+  virtual void beginTest() OVERRIDE;
+  virtual void setupTree() OVERRIDE;
+  virtual void afterTest() OVERRIDE;
+
+  scoped_refptr<SolidColorLayer> CreateSolidColorLayer(gfx::Rect rect,
+                                                       SkColor color);
+
+  void RunPixelTest(scoped_refptr<Layer> content_root,
+                    base::FilePath file_name);
+
+  // Common CSS colors defined for tests to use.

[jamesr, 2013/03/14 20:00:46]

third_party/skia/include/core/SkColor already has most of these:


#define SK_ColorTRANSPARENT 0x00000000  //!< transparent SkColor value

#define SK_ColorBLACK       0xFF000000  //!< black SkColor value
#define SK_ColorDKGRAY      0xFF444444  //!< dark gray SkColor value
#define SK_ColorGRAY        0xFF888888  //!< gray SkColor value
#define SK_ColorLTGRAY      0xFFCCCCCC  //!< light gray SkColor value
#define SK_ColorWHITE       0xFFFFFFFF  //!< white SkColor value

#define SK_ColorRED         0xFFFF0000  //!< red SkColor value
#define SK_ColorGREEN       0xFF00FF00  //!< green SkColor value
#define SK_ColorBLUE        0xFF0000FF  //!< blue SkColor value
#define SK_ColorYELLOW      0xFFFFFF00  //!< yellow SkColor value
#define SK_ColorCYAN        0xFF00FFFF  //!< cyan SkColor value
#define SK_ColorMAGENTA     0xFFFF00FF  //!< magenta SkColor value

Why do we need more?

[danakj, 2013/03/14 20:43:50]

Yeh, these colors are not the same as web colors and I mostly just didn't want
to use that green cuz it's ugly, and different from layout tests (it's not css
green), and hard to see blending with white clearly since it's so bright.

If you don't really care about using css colors I can just use a custom green in
those tests instead of SK_ColorGREEN since I care about it for them.

+  enum Colors {
+    kTransparent = 0x00000000,
+    kBlack = 0xff000000,
+    kRed = 0xffff0000,
+    kCyan = 0xff00ffff,
+    kBlue = 0xff0000ff,
+    kYellow = 0xffffff00,
+    kOrange = 0xffffa500,
+    kBrown = 0xffa52a2a,
+    kGreen = 0xff008000,
+  };
+
+ private:
+  scoped_refptr<Layer> content_root_;
+  base::FilePath ref_file_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_LAYER_TREE_PIXEL_TEST_H_