cc: Add test for AA quads due to precision loss

cc/output/gl_renderer.h

 // Copyright 2010 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.
 
 #ifndef CC_OUTPUT_GL_RENDERER_H_
 #define CC_OUTPUT_GL_RENDERER_H_
 
 #include "base/cancelable_callback.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
@@ skipping 106 matching lines @@
   virtual void BeginDrawingFrame(DrawingFrame* frame) OVERRIDE;
   virtual void FinishDrawingFrame(DrawingFrame* frame) OVERRIDE;
   virtual bool FlippedFramebuffer() const OVERRIDE;
   virtual void EnsureScissorTestEnabled() OVERRIDE;
   virtual void EnsureScissorTestDisabled() OVERRIDE;
   virtual void CopyCurrentRenderPassToBitmap(
       DrawingFrame* frame,
       scoped_ptr<CopyOutputRequest> request) OVERRIDE;
   virtual void FinishDrawingQuadList() OVERRIDE;
 
+  // Check if quad needs antialiasing and if so, inflate the quad and
+  // fill edge array for fragment shader.  local_quad is set to
+  // inflated quad if antialiasing is required, otherwise it is left
+  // unchanged.  edge array is filled with inflated quad's edge data
+  // if antialiasing is required, otherwise it is left unchanged.
+  // Returns true if quad requires antialiasing and false otherwise.
+  static bool SetupQuadForAntialiasing(const gfx::Transform& device_transform,
+                                       const DrawQuad* quad,
+                                       gfx::QuadF* local_quad,
+                                       float edge[24]);
+
  private:
   friend class GLRendererShaderPixelTest;
   friend class GLRendererShaderTest;
 
   static void ToGLMatrix(float* gl_matrix, const gfx::Transform& transform);
 
   void DrawCheckerboardQuad(const DrawingFrame* frame,
                             const CheckerboardDrawQuad* quad);
   void DrawDebugBorderQuad(const DrawingFrame* frame,
                            const DebugBorderDrawQuad* quad);
@@ skipping 30 matching lines @@
                         const gfx::RectF& quad_rect,
                         int matrix_location);
   void SetUseProgram(unsigned program);
 
   void CopyTextureToFramebuffer(const DrawingFrame* frame,
                                 int texture_id,
                                 gfx::Rect rect,
                                 const gfx::Transform& draw_matrix,
                                 bool flip_vertically);
 
-  // Check if quad needs antialiasing and if so, inflate the quad and
-  // fill edge array for fragment shader.  local_quad is set to
-  // inflated quad if antialiasing is required, otherwise it is left
-  // unchanged.  edge array is filled with inflated quad's edge data
-  // if antialiasing is required, otherwise it is left unchanged.
-  // Returns true if quad requires antialiasing and false otherwise.
-  bool SetupQuadForAntialiasing(const gfx::Transform& device_transform,
-                                const DrawQuad* quad,
-                                gfx::QuadF* local_quad,
-                                float edge[24]) const;
-
   bool UseScopedTexture(DrawingFrame* frame,
                         const ScopedResource* resource,
                         gfx::Rect viewport_rect);
 
   bool MakeContextCurrent();
 
   bool InitializeSharedObjects();
   void CleanupSharedObjects();
 
   typedef base::Callback<void(scoped_ptr<CopyOutputRequest> copy_request,
@@ skipping 262 matching lines @@
 #if DEBUG_GL_CALLS && !defined(NDEBUG)
 #define GLC(context, x)                                                        \
   (x, GLRenderer::DebugGLCall(&* context, #x, __FILE__, __LINE__))
 #else
 #define GLC(context, x) (x)
 #endif
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_GL_RENDERER_H_