Implement transform/clip support for Android WebView.

cc/test/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/file_util.h"
 #include "cc/output/gl_renderer.h"
+#include "cc/output/software_renderer.h"
 #include "cc/quads/render_pass.h"
 #include "cc/test/pixel_comparator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size.h"
 
 #ifndef CC_TEST_PIXEL_TEST_H_
 #define CC_TEST_PIXEL_TEST_H_
 
 namespace cc {
 class DirectRenderer;
 class SoftwareRenderer;
 class OutputSurface;
 class ResourceProvider;
 
 class PixelTest : public testing::Test {
  protected:
   PixelTest();
   virtual ~PixelTest();
 
   bool RunPixelTest(RenderPassList* pass_list,
                     const base::FilePath& ref_file,
                     const PixelComparator& comparator);
 
   bool RunPixelTestWithReadbackTarget(RenderPassList* pass_list,
                                       RenderPass* target,
                                       const base::FilePath& ref_file,
                                       const PixelComparator& comparator);
 
   gfx::Size device_viewport_size_;
+  class PixelTestOutputSurface;
+  class PixelTestRendererClient;
   scoped_ptr<OutputSurface> output_surface_;
   scoped_ptr<ResourceProvider> resource_provider_;
-  class PixelTestRendererClient;
   scoped_ptr<PixelTestRendererClient> fake_client_;
   scoped_ptr<DirectRenderer> renderer_;
   scoped_ptr<SkBitmap> result_bitmap_;
 
   void SetUpGLRenderer(bool use_skia_gpu_backend);
   void SetUpSoftwareRenderer();
 
+  void ForceExpandedViewport(gfx::Size surface_expansion,
+                             gfx::Vector2d viewport_offset);
+
  private:
   void ReadbackResult(base::Closure quit_run_loop, scoped_ptr<SkBitmap> bitmap);
 
   bool PixelsMatchReference(const base::FilePath& ref_file,
                             const PixelComparator& comparator);
 };
 
 template<typename RendererType>
 class RendererPixelTest : public PixelTest {
  public:
   RendererType* renderer() {
     return static_cast<RendererType*>(renderer_.get());
   }
 
   bool UseSkiaGPUBackend() const;
+  bool ExpandedViewport() const;
 
  protected:
   virtual void SetUp() OVERRIDE;
 };
 
 // A simple wrapper to differentiate a renderer that should use ganesh
 // and one that shouldn't in templates.
 class GLRendererWithSkiaGPUBackend : public GLRenderer {
  public:
   GLRendererWithSkiaGPUBackend(RendererClient* client,
                        OutputSurface* output_surface,
                        ResourceProvider* resource_provider,
                        int highp_threshold_min)
       : GLRenderer(client,
                    output_surface,
                    resource_provider,
                    highp_threshold_min) {}
 };
 
+// Wrappers to differentiate renderers where the the output surface and viewport
+// have an externally determined size and offset.
+class GLRendererWithExpandedViewport : public GLRenderer {
+ public:
+  GLRendererWithExpandedViewport(RendererClient* client,
+                       OutputSurface* output_surface,
+                       ResourceProvider* resource_provider,
+                       int highp_threshold_min)
+      : GLRenderer(client,
+                   output_surface,
+                   resource_provider,
+                   highp_threshold_min) {}
+};
+
+class SoftwareRendererWithExpandedViewport : public SoftwareRenderer {
+ public:
+  SoftwareRendererWithExpandedViewport(RendererClient* client,
+                       OutputSurface* output_surface,
+                       ResourceProvider* resource_provider)
+      : SoftwareRenderer(client,
+                   output_surface,
+                   resource_provider) {}
+};
+
+
 template<>
 inline void RendererPixelTest<GLRenderer>::SetUp() {
   SetUpGLRenderer(false);
   DCHECK(!renderer()->CanUseSkiaGPUBackend());
 }
 
 template<>
 inline bool RendererPixelTest<GLRenderer>::UseSkiaGPUBackend() const {
   return false;
 }
 
 template<>
+inline bool RendererPixelTest<GLRenderer>::ExpandedViewport() const {
+  return false;
+}
+
+template<>
 inline void RendererPixelTest<GLRendererWithSkiaGPUBackend>::SetUp() {
   SetUpGLRenderer(true);
   DCHECK(renderer()->CanUseSkiaGPUBackend());
 }
 
 template <>
 inline bool
 RendererPixelTest<GLRendererWithSkiaGPUBackend>::UseSkiaGPUBackend() const {
   return true;
 }
 
+template <>
+inline bool RendererPixelTest<GLRendererWithSkiaGPUBackend>::ExpandedViewport()
+    const {
+  return false;
+}
+
+template<>
+inline void RendererPixelTest<GLRendererWithExpandedViewport>::SetUp() {
+  SetUpGLRenderer(false);
+  ForceExpandedViewport(gfx::Size(50, 50), gfx::Vector2d(10, 20));
+}
+
+template <>
+inline bool
+RendererPixelTest<GLRendererWithExpandedViewport>::UseSkiaGPUBackend() const {
+  return false;
+}
+
+template <>
+inline bool
+RendererPixelTest<GLRendererWithExpandedViewport>::ExpandedViewport() const {
+  return true;
+}
+
 template<>
 inline void RendererPixelTest<SoftwareRenderer>::SetUp() {
   SetUpSoftwareRenderer();
 }
 
 template<>
 inline bool RendererPixelTest<SoftwareRenderer>::UseSkiaGPUBackend() const {
   return false;
 }
 
+template <>
+inline bool RendererPixelTest<SoftwareRenderer>::ExpandedViewport() const {
+  return false;
+}
+
+template<>
+inline void RendererPixelTest<SoftwareRendererWithExpandedViewport>::SetUp() {
+  SetUpSoftwareRenderer();
+  ForceExpandedViewport(gfx::Size(50, 50), gfx::Vector2d(10, 20));
+}
+
+template <>
+inline bool RendererPixelTest<
+    SoftwareRendererWithExpandedViewport>::UseSkiaGPUBackend() const {
+  return false;
+}
+
+template <>
+inline bool RendererPixelTest<
+    SoftwareRendererWithExpandedViewport>::ExpandedViewport() const {
+  return true;
+}
+
 typedef RendererPixelTest<GLRenderer> GLRendererPixelTest;
 typedef RendererPixelTest<GLRendererWithSkiaGPUBackend>
     GLRendererSkiaGPUBackendPixelTest;
 typedef RendererPixelTest<SoftwareRenderer> SoftwareRendererPixelTest;
 
 }  // namespace cc
 
 #endif  // CC_TEST_PIXEL_TEST_H_