src/cobalt/render_tree/resource_provider_stub.h - cobalt - Git at Google

 // Copyright 2015 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #ifndef COBALT_RENDER_TREE_RESOURCE_PROVIDER_STUB_H_
 #define COBALT_RENDER_TREE_RESOURCE_PROVIDER_STUB_H_

 #include <string>
 #include <vector>

 #include "base/memory/aligned_memory.h"
 #include "base/memory/scoped_ptr.h"
 #include "cobalt/base/polymorphic_downcast.h"
 #include "cobalt/render_tree/font.h"
 #include "cobalt/render_tree/font_provider.h"
 #include "cobalt/render_tree/image.h"
 #include "cobalt/render_tree/mesh.h"
 #include "cobalt/render_tree/resource_provider.h"

 namespace cobalt {
 namespace render_tree {

 namespace Internal {

 const int kDefaultTypefaceSizeInBytes = 256;
 const render_tree::TypefaceId kDefaultTypefaceId = 0xffffffff;

 const float kRobotoAscentSizeMultiplier = 0.927734f;
 const float kRobotoDescentSizeMultiplier = 0.244141f;
 const float kRobotoLeadingSizeMultiplier = 0.f;
 const float kRobotoXHeightSizeMultiplier = 0.52832f;

 const int32 kDefaultCharacter = 48;  // Decimal value for '0'
 const render_tree::GlyphIndex kDefaultGlyphIndex = 1;

 const float kDefaultCharacterRobotoGlyphWidthSizeMultiplier = 0.562012f;
 const float kDefaultCharacterRobotoGlyphHeightSizeMultiplier = 0.7f;

 }  // namespace Internal

 // The ResourceProvider defined in this file provides a bare minimum of
 // implementation necessary.  It is useful for tests that do not care about
 // actually rasterizing render trees.  For certain resources like Images,
 // it provides introspection of internal pixel data so that tests can check
 // that images do indeed contain the data they are expected to contain.

 // Simple in-memory pixel data.
 class ImageDataStub : public ImageData {
  public:
   ImageDataStub(const math::Size& size, PixelFormat pixel_format,
                 AlphaFormat alpha_format)
       : descriptor_(size, pixel_format, alpha_format,
                     size.width() * BytesPerPixel(pixel_format)),
         memory_(new uint8[static_cast<size_t>(size.height() *
                                               descriptor_.pitch_in_bytes)]) {}

   const ImageDataDescriptor& GetDescriptor() const OVERRIDE {
     return descriptor_;
   }

   void ReleaseMemory() { memory_.reset(); }
   uint8* GetMemory() OVERRIDE { return memory_.get(); }

  private:
   ImageDataDescriptor descriptor_;
   scoped_array<uint8> memory_;
 };

 // Simply wraps the ImageDataStub object and also makes it visible to the
 // public so that tests can access the pixel data.
 class ImageStub : public Image {
  public:
   explicit ImageStub(scoped_ptr<ImageDataStub> image_data)
       : image_data_(image_data.Pass()) {}

   const math::Size& GetSize() const OVERRIDE {
     return image_data_->GetDescriptor().size;
   }

   ImageDataStub* GetImageData() { return image_data_.get(); }

  private:
   ~ImageStub() OVERRIDE {}

   scoped_ptr<ImageDataStub> image_data_;
 };

 // Simple class that returns dummy data for metric information modeled on
 // Roboto.
 class FontStub : public Font {
  public:
   FontStub(const scoped_refptr<Typeface>& typeface, float font_size)
       : typeface_(typeface),
         font_metrics_(Internal::kRobotoAscentSizeMultiplier * font_size,
                       Internal::kRobotoDescentSizeMultiplier * font_size,
                       Internal::kRobotoLeadingSizeMultiplier * font_size,
                       Internal::kRobotoXHeightSizeMultiplier * font_size),
         glyph_bounds_(
             0,
             std::max(
                 Internal::kDefaultCharacterRobotoGlyphHeightSizeMultiplier *
                     font_size,
                 1.0f),
             Internal::kDefaultCharacterRobotoGlyphWidthSizeMultiplier *
                 font_size,
             std::max(
                 Internal::kDefaultCharacterRobotoGlyphHeightSizeMultiplier *
                     font_size,
                 1.0f)) {}

   TypefaceId GetTypefaceId() const OVERRIDE { return typeface_->GetId(); }

   FontMetrics GetFontMetrics() const OVERRIDE { return font_metrics_; }

   GlyphIndex GetGlyphForCharacter(int32 utf32_character) OVERRIDE {
     return typeface_->GetGlyphForCharacter(utf32_character);
   }

   const math::RectF& GetGlyphBounds(GlyphIndex glyph) OVERRIDE {
     UNREFERENCED_PARAMETER(glyph);
     return glyph_bounds_;
   }

   float GetGlyphWidth(GlyphIndex glyph) OVERRIDE {
     UNREFERENCED_PARAMETER(glyph);
     return glyph_bounds_.width();
   }

  private:
   ~FontStub() OVERRIDE {}

   const scoped_refptr<Typeface> typeface_;
   const FontMetrics font_metrics_;
   math::RectF glyph_bounds_;
 };

 // Simple class that returns dummy data for metric information modeled on
 // Roboto.
 class TypefaceStub : public Typeface {
  public:
   explicit TypefaceStub(const void* data) { UNREFERENCED_PARAMETER(data); }

   TypefaceId GetId() const OVERRIDE { return Internal::kDefaultTypefaceId; }

   uint32 GetEstimatedSizeInBytes() const OVERRIDE {
     return Internal::kDefaultTypefaceSizeInBytes;
   }

   scoped_refptr<Font> CreateFontWithSize(float font_size) OVERRIDE {
     return make_scoped_refptr(new FontStub(this, font_size));
   }

   GlyphIndex GetGlyphForCharacter(int32 utf32_character) OVERRIDE {
     UNREFERENCED_PARAMETER(utf32_character);
     return Internal::kDefaultGlyphIndex;
   }

  private:
   ~TypefaceStub() OVERRIDE {}
 };

 class RawImageMemoryStub : public RawImageMemory {
  public:
   typedef scoped_ptr_malloc<uint8_t, base::ScopedPtrAlignedFree> ScopedMemory;

   RawImageMemoryStub(size_t size_in_bytes, size_t alignment)
       : size_in_bytes_(size_in_bytes) {
     memory_ = ScopedMemory(
         static_cast<uint8_t*>(base::AlignedAlloc(size_in_bytes, alignment)));
   }

   size_t GetSizeInBytes() const OVERRIDE { return size_in_bytes_; }

   uint8_t* GetMemory() OVERRIDE { return memory_.get(); }

  private:
   ~RawImageMemoryStub() OVERRIDE {}

   size_t size_in_bytes_;
   ScopedMemory memory_;
 };

 class MeshStub : public render_tree::Mesh {
  public:
   MeshStub(scoped_ptr<std::vector<render_tree::Mesh::Vertex> > vertices,
            render_tree::Mesh::DrawMode draw_mode)
       : vertices_(vertices.Pass()), draw_mode_(draw_mode) {}

   uint32 GetEstimatedSizeInBytes() const OVERRIDE {
     return static_cast<uint32>(vertices_->size() * 5 * sizeof(float) +
                                sizeof(DrawMode));
   }

   render_tree::Mesh::DrawMode GetDrawMode() const { return draw_mode_; }
   const std::vector<render_tree::Mesh::Vertex>& GetVertices() const {
     return *vertices_.get();
   }

  private:
   const scoped_ptr<std::vector<render_tree::Mesh::Vertex> > vertices_;
   const render_tree::Mesh::DrawMode draw_mode_;
 };

 // Return the stub versions defined above for each resource.
 class ResourceProviderStub : public ResourceProvider {
  public:
   ResourceProviderStub() : release_image_data_(false) {}
   explicit ResourceProviderStub(bool release_image_data)
       : release_image_data_(release_image_data) {}
   ~ResourceProviderStub() OVERRIDE {}

   base::TypeId GetTypeId() const OVERRIDE {
     return base::GetTypeId<ResourceProviderStub>();
   }

   void Finish() OVERRIDE {}

   bool PixelFormatSupported(PixelFormat pixel_format) OVERRIDE {
     UNREFERENCED_PARAMETER(pixel_format);
     return true;
   }

   bool AlphaFormatSupported(AlphaFormat alpha_format) OVERRIDE {
     UNREFERENCED_PARAMETER(alpha_format);
     return true;
   }

   scoped_ptr<ImageData> AllocateImageData(const math::Size& size,
                                           PixelFormat pixel_format,
                                           AlphaFormat alpha_format) OVERRIDE {
     return scoped_ptr<ImageData>(
         new ImageDataStub(size, pixel_format, alpha_format));
   }

   scoped_refptr<Image> CreateImage(scoped_ptr<ImageData> source_data) OVERRIDE {
     scoped_ptr<ImageDataStub> skia_source_data(
         base::polymorphic_downcast<ImageDataStub*>(source_data.release()));
     if (release_image_data_) {
       skia_source_data->ReleaseMemory();
     }
     return make_scoped_refptr(new ImageStub(skia_source_data.Pass()));
   }

 #if SB_HAS(GRAPHICS)
   scoped_refptr<Image> CreateImageFromSbDecodeTarget(
       SbDecodeTarget decode_target) OVERRIDE {
     NOTREACHED();
     SbDecodeTargetRelease(decode_target);
     return NULL;
   }

   bool SupportsSbDecodeTarget() OVERRIDE { return false; }
 #endif  // SB_HAS(GRAPHICS)

 #if SB_HAS(GRAPHICS)
   SbDecodeTargetGraphicsContextProvider*
   GetSbDecodeTargetGraphicsContextProvider() OVERRIDE {
     return NULL;
   }
 #endif  // SB_HAS(GRAPHICS)

   scoped_ptr<RawImageMemory> AllocateRawImageMemory(size_t size_in_bytes,
                                                     size_t alignment) OVERRIDE {
     return scoped_ptr<RawImageMemory>(
         new RawImageMemoryStub(size_in_bytes, alignment));
   }

   scoped_refptr<Image> CreateMultiPlaneImageFromRawMemory(
       scoped_ptr<RawImageMemory> raw_image_memory,
       const MultiPlaneImageDataDescriptor& descriptor) OVERRIDE {
     UNREFERENCED_PARAMETER(raw_image_memory);
     UNREFERENCED_PARAMETER(descriptor);
     return scoped_refptr<Image>();
   }

   bool HasLocalFontFamily(const char* font_family_name) const OVERRIDE {
     UNREFERENCED_PARAMETER(font_family_name);
     return true;
   }

   scoped_refptr<Typeface> GetLocalTypeface(const char* font_family_name,
                                            FontStyle font_style) OVERRIDE {
     UNREFERENCED_PARAMETER(font_family_name);
     UNREFERENCED_PARAMETER(font_style);
     return make_scoped_refptr(new TypefaceStub(NULL));
   }

   scoped_refptr<render_tree::Typeface> GetLocalTypefaceByFaceNameIfAvailable(
       const char* font_face_name) OVERRIDE {
     UNREFERENCED_PARAMETER(font_face_name);
     return make_scoped_refptr(new TypefaceStub(NULL));
   }

   scoped_refptr<Typeface> GetCharacterFallbackTypeface(
       int32 utf32_character, FontStyle font_style,
       const std::string& language) OVERRIDE {
     UNREFERENCED_PARAMETER(utf32_character);
     UNREFERENCED_PARAMETER(font_style);
     UNREFERENCED_PARAMETER(language);
     return make_scoped_refptr(new TypefaceStub(NULL));
   }

   scoped_refptr<Typeface> CreateTypefaceFromRawData(
       scoped_ptr<RawTypefaceDataVector> raw_data,
       std::string* error_string) OVERRIDE {
     UNREFERENCED_PARAMETER(raw_data);
     UNREFERENCED_PARAMETER(error_string);
     return make_scoped_refptr(new TypefaceStub(NULL));
   }

   float GetTextWidth(const char16* text_buffer, size_t text_length,
                      const std::string& language, bool is_rtl,
                      FontProvider* font_provider,
                      FontVector* maybe_used_fonts) OVERRIDE {
     UNREFERENCED_PARAMETER(text_buffer);
     UNREFERENCED_PARAMETER(language);
     UNREFERENCED_PARAMETER(is_rtl);
     render_tree::GlyphIndex glyph_index;
     const scoped_refptr<render_tree::Font>& font =
         font_provider->GetCharacterFont(Internal::kDefaultCharacter,
                                         &glyph_index);
     if (maybe_used_fonts) {
       maybe_used_fonts->push_back(font);
     }
     return font->GetGlyphWidth(glyph_index) * text_length;
   }

   // Creates a glyph buffer, which is populated with shaped text, and used to
   // render that text.
   scoped_refptr<GlyphBuffer> CreateGlyphBuffer(
       const char16* text_buffer, size_t text_length,
       const std::string& language, bool is_rtl,
       FontProvider* font_provider) OVERRIDE {
     UNREFERENCED_PARAMETER(text_buffer);
     UNREFERENCED_PARAMETER(language);
     UNREFERENCED_PARAMETER(is_rtl);
     render_tree::GlyphIndex glyph_index;
     const scoped_refptr<render_tree::Font>& font =
         font_provider->GetCharacterFont(Internal::kDefaultCharacter,
                                         &glyph_index);
     const math::RectF& glyph_bounds = font->GetGlyphBounds(glyph_index);
     return make_scoped_refptr(new GlyphBuffer(
         math::RectF(0, glyph_bounds.y(), glyph_bounds.width() * text_length,
                     glyph_bounds.height())));
   }

   // Creates a glyph buffer, which is populated with shaped text, and used to
   // render that text.
   scoped_refptr<GlyphBuffer> CreateGlyphBuffer(
       const std::string& utf8_string,
       const scoped_refptr<Font>& font) OVERRIDE {
     const math::RectF& glyph_bounds =
         font->GetGlyphBounds(Internal::kDefaultGlyphIndex);
     return make_scoped_refptr(new GlyphBuffer(math::RectF(
         0, glyph_bounds.y(), glyph_bounds.width() * utf8_string.size(),
         glyph_bounds.height())));
   }

   // Create a mesh which can map replaced boxes to 3D shapes.
   scoped_refptr<render_tree::Mesh> CreateMesh(
       scoped_ptr<std::vector<render_tree::Mesh::Vertex> > vertices,
       render_tree::Mesh::DrawMode draw_mode) OVERRIDE {
     return new MeshStub(vertices.Pass(), draw_mode);
   }

   scoped_refptr<Image> DrawOffscreenImage(
       const scoped_refptr<render_tree::Node>& root) OVERRIDE {
     UNREFERENCED_PARAMETER(root);
     return scoped_refptr<Image>(NULL);
   }

   bool release_image_data_;
 };

 }  // namespace render_tree
 }  // namespace cobalt

 #endif  // COBALT_RENDER_TREE_RESOURCE_PROVIDER_STUB_H_
	// Copyright 2015 Google Inc. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#ifndef COBALT_RENDER_TREE_RESOURCE_PROVIDER_STUB_H_
	#define COBALT_RENDER_TREE_RESOURCE_PROVIDER_STUB_H_

	#include <string>
	#include <vector>

	#include "base/memory/aligned_memory.h"
	#include "base/memory/scoped_ptr.h"
	#include "cobalt/base/polymorphic_downcast.h"
	#include "cobalt/render_tree/font.h"
	#include "cobalt/render_tree/font_provider.h"
	#include "cobalt/render_tree/image.h"
	#include "cobalt/render_tree/mesh.h"
	#include "cobalt/render_tree/resource_provider.h"

	namespace cobalt {
	namespace render_tree {

	namespace Internal {

	const int kDefaultTypefaceSizeInBytes = 256;
	const render_tree::TypefaceId kDefaultTypefaceId = 0xffffffff;

	const float kRobotoAscentSizeMultiplier = 0.927734f;
	const float kRobotoDescentSizeMultiplier = 0.244141f;
	const float kRobotoLeadingSizeMultiplier = 0.f;
	const float kRobotoXHeightSizeMultiplier = 0.52832f;

	const int32 kDefaultCharacter = 48; // Decimal value for '0'
	const render_tree::GlyphIndex kDefaultGlyphIndex = 1;

	const float kDefaultCharacterRobotoGlyphWidthSizeMultiplier = 0.562012f;
	const float kDefaultCharacterRobotoGlyphHeightSizeMultiplier = 0.7f;

	} // namespace Internal

	// The ResourceProvider defined in this file provides a bare minimum of
	// implementation necessary. It is useful for tests that do not care about
	// actually rasterizing render trees. For certain resources like Images,
	// it provides introspection of internal pixel data so that tests can check
	// that images do indeed contain the data they are expected to contain.

	// Simple in-memory pixel data.
	class ImageDataStub : public ImageData {
	public:
	ImageDataStub(const math::Size& size, PixelFormat pixel_format,
	AlphaFormat alpha_format)
	: descriptor_(size, pixel_format, alpha_format,
	size.width() * BytesPerPixel(pixel_format)),
	memory_(new uint8[static_cast<size_t>(size.height() *
	descriptor_.pitch_in_bytes)]) {}

	const ImageDataDescriptor& GetDescriptor() const OVERRIDE {
	return descriptor_;
	}

	void ReleaseMemory() { memory_.reset(); }
	uint8* GetMemory() OVERRIDE { return memory_.get(); }

	private:
	ImageDataDescriptor descriptor_;
	scoped_array<uint8> memory_;
	};

	// Simply wraps the ImageDataStub object and also makes it visible to the
	// public so that tests can access the pixel data.
	class ImageStub : public Image {
	public:
	explicit ImageStub(scoped_ptr<ImageDataStub> image_data)
	: image_data_(image_data.Pass()) {}

	const math::Size& GetSize() const OVERRIDE {
	return image_data_->GetDescriptor().size;
	}

	ImageDataStub* GetImageData() { return image_data_.get(); }

	private:
	~ImageStub() OVERRIDE {}

	scoped_ptr<ImageDataStub> image_data_;
	};

	// Simple class that returns dummy data for metric information modeled on
	// Roboto.
	class FontStub : public Font {
	public:
	FontStub(const scoped_refptr<Typeface>& typeface, float font_size)
	: typeface_(typeface),
	font_metrics_(Internal::kRobotoAscentSizeMultiplier * font_size,
	Internal::kRobotoDescentSizeMultiplier * font_size,
	Internal::kRobotoLeadingSizeMultiplier * font_size,
	Internal::kRobotoXHeightSizeMultiplier * font_size),
	glyph_bounds_(
	0,
	std::max(
	Internal::kDefaultCharacterRobotoGlyphHeightSizeMultiplier *
	font_size,
	1.0f),
	Internal::kDefaultCharacterRobotoGlyphWidthSizeMultiplier *
	font_size,
	std::max(
	Internal::kDefaultCharacterRobotoGlyphHeightSizeMultiplier *
	font_size,
	1.0f)) {}

	TypefaceId GetTypefaceId() const OVERRIDE { return typeface_->GetId(); }

	FontMetrics GetFontMetrics() const OVERRIDE { return font_metrics_; }

	GlyphIndex GetGlyphForCharacter(int32 utf32_character) OVERRIDE {
	return typeface_->GetGlyphForCharacter(utf32_character);
	}

	const math::RectF& GetGlyphBounds(GlyphIndex glyph) OVERRIDE {
	UNREFERENCED_PARAMETER(glyph);
	return glyph_bounds_;
	}

	float GetGlyphWidth(GlyphIndex glyph) OVERRIDE {
	UNREFERENCED_PARAMETER(glyph);
	return glyph_bounds_.width();
	}

	private:
	~FontStub() OVERRIDE {}

	const scoped_refptr<Typeface> typeface_;
	const FontMetrics font_metrics_;
	math::RectF glyph_bounds_;
	};

	// Simple class that returns dummy data for metric information modeled on
	// Roboto.
	class TypefaceStub : public Typeface {
	public:
	explicit TypefaceStub(const void* data) { UNREFERENCED_PARAMETER(data); }

	TypefaceId GetId() const OVERRIDE { return Internal::kDefaultTypefaceId; }

	uint32 GetEstimatedSizeInBytes() const OVERRIDE {
	return Internal::kDefaultTypefaceSizeInBytes;
	}

	scoped_refptr<Font> CreateFontWithSize(float font_size) OVERRIDE {
	return make_scoped_refptr(new FontStub(this, font_size));
	}

	GlyphIndex GetGlyphForCharacter(int32 utf32_character) OVERRIDE {
	UNREFERENCED_PARAMETER(utf32_character);
	return Internal::kDefaultGlyphIndex;
	}

	private:
	~TypefaceStub() OVERRIDE {}
	};

	class RawImageMemoryStub : public RawImageMemory {
	public:
	typedef scoped_ptr_malloc<uint8_t, base::ScopedPtrAlignedFree> ScopedMemory;

	RawImageMemoryStub(size_t size_in_bytes, size_t alignment)
	: size_in_bytes_(size_in_bytes) {
	memory_ = ScopedMemory(
	static_cast<uint8_t*>(base::AlignedAlloc(size_in_bytes, alignment)));
	}

	size_t GetSizeInBytes() const OVERRIDE { return size_in_bytes_; }

	uint8_t* GetMemory() OVERRIDE { return memory_.get(); }

	private:
	~RawImageMemoryStub() OVERRIDE {}

	size_t size_in_bytes_;
	ScopedMemory memory_;
	};

	class MeshStub : public render_tree::Mesh {
	public:
	MeshStub(scoped_ptr<std::vector<render_tree::Mesh::Vertex> > vertices,
	render_tree::Mesh::DrawMode draw_mode)
	: vertices_(vertices.Pass()), draw_mode_(draw_mode) {}

	uint32 GetEstimatedSizeInBytes() const OVERRIDE {
	return static_cast<uint32>(vertices_->size() * 5 * sizeof(float) +
	sizeof(DrawMode));
	}

	render_tree::Mesh::DrawMode GetDrawMode() const { return draw_mode_; }
	const std::vector<render_tree::Mesh::Vertex>& GetVertices() const {
	return *vertices_.get();
	}

	private:
	const scoped_ptr<std::vector<render_tree::Mesh::Vertex> > vertices_;
	const render_tree::Mesh::DrawMode draw_mode_;
	};

	// Return the stub versions defined above for each resource.
	class ResourceProviderStub : public ResourceProvider {
	public:
	ResourceProviderStub() : release_image_data_(false) {}
	explicit ResourceProviderStub(bool release_image_data)
	: release_image_data_(release_image_data) {}
	~ResourceProviderStub() OVERRIDE {}

	base::TypeId GetTypeId() const OVERRIDE {
	return base::GetTypeId<ResourceProviderStub>();
	}

	void Finish() OVERRIDE {}

	bool PixelFormatSupported(PixelFormat pixel_format) OVERRIDE {
	UNREFERENCED_PARAMETER(pixel_format);
	return true;
	}

	bool AlphaFormatSupported(AlphaFormat alpha_format) OVERRIDE {
	UNREFERENCED_PARAMETER(alpha_format);
	return true;
	}

	scoped_ptr<ImageData> AllocateImageData(const math::Size& size,
	PixelFormat pixel_format,
	AlphaFormat alpha_format) OVERRIDE {
	return scoped_ptr<ImageData>(
	new ImageDataStub(size, pixel_format, alpha_format));
	}

	scoped_refptr<Image> CreateImage(scoped_ptr<ImageData> source_data) OVERRIDE {
	scoped_ptr<ImageDataStub> skia_source_data(
	base::polymorphic_downcast<ImageDataStub*>(source_data.release()));
	if (release_image_data_) {
	skia_source_data->ReleaseMemory();
	}
	return make_scoped_refptr(new ImageStub(skia_source_data.Pass()));
	}

	#if SB_HAS(GRAPHICS)
	scoped_refptr<Image> CreateImageFromSbDecodeTarget(
	SbDecodeTarget decode_target) OVERRIDE {
	NOTREACHED();
	SbDecodeTargetRelease(decode_target);
	return NULL;
	}

	bool SupportsSbDecodeTarget() OVERRIDE { return false; }
	#endif // SB_HAS(GRAPHICS)

	#if SB_HAS(GRAPHICS)
	SbDecodeTargetGraphicsContextProvider*
	GetSbDecodeTargetGraphicsContextProvider() OVERRIDE {
	return NULL;
	}
	#endif // SB_HAS(GRAPHICS)

	scoped_ptr<RawImageMemory> AllocateRawImageMemory(size_t size_in_bytes,
	size_t alignment) OVERRIDE {
	return scoped_ptr<RawImageMemory>(
	new RawImageMemoryStub(size_in_bytes, alignment));
	}

	scoped_refptr<Image> CreateMultiPlaneImageFromRawMemory(
	scoped_ptr<RawImageMemory> raw_image_memory,
	const MultiPlaneImageDataDescriptor& descriptor) OVERRIDE {
	UNREFERENCED_PARAMETER(raw_image_memory);
	UNREFERENCED_PARAMETER(descriptor);
	return scoped_refptr<Image>();
	}

	bool HasLocalFontFamily(const char* font_family_name) const OVERRIDE {
	UNREFERENCED_PARAMETER(font_family_name);
	return true;
	}

	scoped_refptr<Typeface> GetLocalTypeface(const char* font_family_name,
	FontStyle font_style) OVERRIDE {
	UNREFERENCED_PARAMETER(font_family_name);
	UNREFERENCED_PARAMETER(font_style);
	return make_scoped_refptr(new TypefaceStub(NULL));
	}

	scoped_refptr<render_tree::Typeface> GetLocalTypefaceByFaceNameIfAvailable(
	const char* font_face_name) OVERRIDE {
	UNREFERENCED_PARAMETER(font_face_name);
	return make_scoped_refptr(new TypefaceStub(NULL));
	}

	scoped_refptr<Typeface> GetCharacterFallbackTypeface(
	int32 utf32_character, FontStyle font_style,
	const std::string& language) OVERRIDE {
	UNREFERENCED_PARAMETER(utf32_character);
	UNREFERENCED_PARAMETER(font_style);
	UNREFERENCED_PARAMETER(language);
	return make_scoped_refptr(new TypefaceStub(NULL));
	}

	scoped_refptr<Typeface> CreateTypefaceFromRawData(
	scoped_ptr<RawTypefaceDataVector> raw_data,
	std::string* error_string) OVERRIDE {
	UNREFERENCED_PARAMETER(raw_data);
	UNREFERENCED_PARAMETER(error_string);
	return make_scoped_refptr(new TypefaceStub(NULL));
	}

	float GetTextWidth(const char16* text_buffer, size_t text_length,
	const std::string& language, bool is_rtl,
	FontProvider* font_provider,
	FontVector* maybe_used_fonts) OVERRIDE {
	UNREFERENCED_PARAMETER(text_buffer);
	UNREFERENCED_PARAMETER(language);
	UNREFERENCED_PARAMETER(is_rtl);
	render_tree::GlyphIndex glyph_index;
	const scoped_refptr<render_tree::Font>& font =
	font_provider->GetCharacterFont(Internal::kDefaultCharacter,
	&glyph_index);
	if (maybe_used_fonts) {
	maybe_used_fonts->push_back(font);
	}
	return font->GetGlyphWidth(glyph_index) * text_length;
	}

	// Creates a glyph buffer, which is populated with shaped text, and used to
	// render that text.
	scoped_refptr<GlyphBuffer> CreateGlyphBuffer(
	const char16* text_buffer, size_t text_length,
	const std::string& language, bool is_rtl,
	FontProvider* font_provider) OVERRIDE {
	UNREFERENCED_PARAMETER(text_buffer);
	UNREFERENCED_PARAMETER(language);
	UNREFERENCED_PARAMETER(is_rtl);
	render_tree::GlyphIndex glyph_index;
	const scoped_refptr<render_tree::Font>& font =
	font_provider->GetCharacterFont(Internal::kDefaultCharacter,
	&glyph_index);
	const math::RectF& glyph_bounds = font->GetGlyphBounds(glyph_index);
	return make_scoped_refptr(new GlyphBuffer(
	math::RectF(0, glyph_bounds.y(), glyph_bounds.width() * text_length,
	glyph_bounds.height())));
	}

	// Creates a glyph buffer, which is populated with shaped text, and used to
	// render that text.
	scoped_refptr<GlyphBuffer> CreateGlyphBuffer(
	const std::string& utf8_string,
	const scoped_refptr<Font>& font) OVERRIDE {
	const math::RectF& glyph_bounds =
	font->GetGlyphBounds(Internal::kDefaultGlyphIndex);
	return make_scoped_refptr(new GlyphBuffer(math::RectF(
	0, glyph_bounds.y(), glyph_bounds.width() * utf8_string.size(),
	glyph_bounds.height())));
	}

	// Create a mesh which can map replaced boxes to 3D shapes.
	scoped_refptr<render_tree::Mesh> CreateMesh(
	scoped_ptr<std::vector<render_tree::Mesh::Vertex> > vertices,
	render_tree::Mesh::DrawMode draw_mode) OVERRIDE {
	return new MeshStub(vertices.Pass(), draw_mode);
	}

	scoped_refptr<Image> DrawOffscreenImage(
	const scoped_refptr<render_tree::Node>& root) OVERRIDE {
	UNREFERENCED_PARAMETER(root);
	return scoped_refptr<Image>(NULL);
	}

	bool release_image_data_;
	};

	} // namespace render_tree
	} // namespace cobalt

	#endif // COBALT_RENDER_TREE_RESOURCE_PROVIDER_STUB_H_