cc/test/layer_tree_pixel_test.cc - chromium/src - Git at Google

 // 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 "cc/test/layer_tree_pixel_test.h"

 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "cc/base/switches.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/layers/texture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/resources/texture_mailbox.h"
 #include "cc/test/paths.h"
 #include "cc/test/pixel_comparator.h"
 #include "cc/test/pixel_test_output_surface.h"
 #include "cc/test/pixel_test_software_output_device.h"
 #include "cc/test/pixel_test_utils.h"
 #include "cc/test/test_in_process_context_provider.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"

 using gpu::gles2::GLES2Interface;

 namespace cc {

 LayerTreePixelTest::LayerTreePixelTest()
     : pixel_comparator_(new ExactPixelComparator(true)),
       test_type_(PIXEL_TEST_GL),
       pending_texture_mailbox_callbacks_(0),
       impl_side_painting_(true) {
 }

 LayerTreePixelTest::~LayerTreePixelTest() {}

 scoped_ptr<OutputSurface> LayerTreePixelTest::CreateOutputSurface() {
   gfx::Size surface_expansion_size(40, 60);
   scoped_ptr<PixelTestOutputSurface> output_surface;

   switch (test_type_) {
     case PIXEL_TEST_SOFTWARE: {
       scoped_ptr<PixelTestSoftwareOutputDevice> software_output_device(
           new PixelTestSoftwareOutputDevice);
       software_output_device->set_surface_expansion_size(
           surface_expansion_size);
       output_surface = make_scoped_ptr(
           new PixelTestOutputSurface(software_output_device.Pass()));
       break;
     }
     case PIXEL_TEST_GL: {
       bool flipped_output_surface = false;
       output_surface = make_scoped_ptr(new PixelTestOutputSurface(
           new TestInProcessContextProvider, flipped_output_surface));
       break;
     }
   }

   output_surface->set_surface_expansion_size(surface_expansion_size);
   return output_surface.Pass();
 }

 void LayerTreePixelTest::CommitCompleteOnThread(LayerTreeHostImpl* impl) {
   LayerTreeImpl* commit_tree =
       impl->pending_tree() ? impl->pending_tree() : impl->active_tree();
   if (commit_tree->source_frame_number() != 0)
     return;

   gfx::Rect viewport = impl->DeviceViewport();
   // The viewport has a 0,0 origin without external influence.
   EXPECT_EQ(gfx::Point().ToString(), viewport.origin().ToString());
   // Be that influence!
   viewport += gfx::Vector2d(20, 10);
   bool resourceless_software_draw = false;
   gfx::Transform identity = gfx::Transform();
   impl->SetExternalDrawConstraints(identity,
                                    viewport,
                                    viewport,
                                    viewport,
                                    identity,
                                    resourceless_software_draw);
   EXPECT_EQ(viewport.ToString(), impl->DeviceViewport().ToString());
 }

 scoped_ptr<CopyOutputRequest> LayerTreePixelTest::CreateCopyOutputRequest() {
   return CopyOutputRequest::CreateBitmapRequest(
       base::Bind(&LayerTreePixelTest::ReadbackResult, base::Unretained(this)));
 }

 void LayerTreePixelTest::ReadbackResult(scoped_ptr<CopyOutputResult> result) {
   ASSERT_TRUE(result->HasBitmap());
   result_bitmap_ = result->TakeBitmap().Pass();
   EndTest();
 }

 void LayerTreePixelTest::BeginTest() {
   Layer* target = readback_target_ ? readback_target_
                                    : layer_tree_host()->root_layer();
   target->RequestCopyOfOutput(CreateCopyOutputRequest().Pass());
   PostSetNeedsCommitToMainThread();
 }

 void LayerTreePixelTest::AfterTest() {
   base::FilePath test_data_dir;
   EXPECT_TRUE(PathService::Get(CCPaths::DIR_TEST_DATA, &test_data_dir));
   base::FilePath ref_file_path = test_data_dir.Append(ref_file_);

   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
   if (cmd->HasSwitch(switches::kCCRebaselinePixeltests))
     EXPECT_TRUE(WritePNGFile(*result_bitmap_, ref_file_path, true));
   EXPECT_TRUE(MatchesPNGFile(*result_bitmap_,
                              ref_file_path,
                              *pixel_comparator_));
 }

 scoped_refptr<SolidColorLayer> LayerTreePixelTest::CreateSolidColorLayer(
     const gfx::Rect& rect, SkColor color) {
   scoped_refptr<SolidColorLayer> layer = SolidColorLayer::Create();
   layer->SetIsDrawable(true);
   layer->SetBounds(rect.size());
   layer->SetPosition(rect.origin());
   layer->SetBackgroundColor(color);
   return layer;
 }

 void LayerTreePixelTest::EndTest() {
   // Drop TextureMailboxes on the main thread so that they can be cleaned up and
   // the pending callbacks will fire.
   for (size_t i = 0; i < texture_layers_.size(); ++i) {
     texture_layers_[i]->SetTextureMailbox(TextureMailbox(), nullptr);
   }

   TryEndTest();
 }

 void LayerTreePixelTest::TryEndTest() {
   if (!result_bitmap_)
     return;
   if (pending_texture_mailbox_callbacks_)
     return;
   LayerTreeTest::EndTest();
 }

 scoped_refptr<SolidColorLayer> LayerTreePixelTest::
     CreateSolidColorLayerWithBorder(
         const gfx::Rect& rect, SkColor color,
         int border_width, SkColor border_color) {
   scoped_refptr<SolidColorLayer> layer = CreateSolidColorLayer(rect, color);
   scoped_refptr<SolidColorLayer> border_top = CreateSolidColorLayer(
       gfx::Rect(0, 0, rect.width(), border_width), border_color);
   scoped_refptr<SolidColorLayer> border_left = CreateSolidColorLayer(
       gfx::Rect(0,
                 border_width,
                 border_width,
                 rect.height() - border_width * 2),
       border_color);
   scoped_refptr<SolidColorLayer> border_right =
       CreateSolidColorLayer(gfx::Rect(rect.width() - border_width,
                                       border_width,
                                       border_width,
                                       rect.height() - border_width * 2),
                             border_color);
   scoped_refptr<SolidColorLayer> border_bottom = CreateSolidColorLayer(
       gfx::Rect(0, rect.height() - border_width, rect.width(), border_width),
       border_color);
   layer->AddChild(border_top);
   layer->AddChild(border_left);
   layer->AddChild(border_right);
   layer->AddChild(border_bottom);
   return layer;
 }

 scoped_refptr<TextureLayer> LayerTreePixelTest::CreateTextureLayer(
     const gfx::Rect& rect, const SkBitmap& bitmap) {
   scoped_refptr<TextureLayer> layer = TextureLayer::CreateForMailbox(NULL);
   layer->SetIsDrawable(true);
   layer->SetBounds(rect.size());
   layer->SetPosition(rect.origin());

   TextureMailbox texture_mailbox;
   scoped_ptr<SingleReleaseCallback> release_callback;
   CopyBitmapToTextureMailboxAsTexture(
       bitmap, &texture_mailbox, &release_callback);
   layer->SetTextureMailbox(texture_mailbox, release_callback.Pass());

   texture_layers_.push_back(layer);
   pending_texture_mailbox_callbacks_++;
   return layer;
 }

 void LayerTreePixelTest::RunPixelTest(
     PixelTestType test_type,
     scoped_refptr<Layer> content_root,
     base::FilePath file_name) {
   test_type_ = test_type;
   content_root_ = content_root;
   readback_target_ = NULL;
   ref_file_ = file_name;
   bool threaded = true;
   RunTest(threaded, false, impl_side_painting_);
 }

 void LayerTreePixelTest::RunSingleThreadedPixelTest(
     PixelTestType test_type,
     scoped_refptr<Layer> content_root,
     base::FilePath file_name) {
   test_type_ = test_type;
   content_root_ = content_root;
   readback_target_ = NULL;
   ref_file_ = file_name;
   bool threaded = false;
   RunTest(threaded, false, impl_side_painting_);
 }

 void LayerTreePixelTest::RunPixelTestWithReadbackTarget(
     PixelTestType test_type,
     scoped_refptr<Layer> content_root,
     Layer* target,
     base::FilePath file_name) {
   test_type_ = test_type;
   content_root_ = content_root;
   readback_target_ = target;
   ref_file_ = file_name;
   RunTest(true, false, impl_side_painting_);
 }

 void LayerTreePixelTest::SetupTree() {
   scoped_refptr<Layer> root = Layer::Create();
   root->SetBounds(content_root_->bounds());
   root->AddChild(content_root_);
   layer_tree_host()->SetRootLayer(root);
   LayerTreeTest::SetupTree();
 }

 scoped_ptr<SkBitmap> LayerTreePixelTest::CopyTextureMailboxToBitmap(
     const gfx::Size& size,
     const TextureMailbox& texture_mailbox) {
   DCHECK(texture_mailbox.IsTexture());
   if (!texture_mailbox.IsTexture())
     return nullptr;

   scoped_ptr<gpu::GLInProcessContext> context = CreateTestInProcessContext();
   GLES2Interface* gl = context->GetImplementation();

   if (texture_mailbox.sync_point())
     gl->WaitSyncPointCHROMIUM(texture_mailbox.sync_point());

   GLuint texture_id = 0;
   gl->GenTextures(1, &texture_id);
   gl->BindTexture(GL_TEXTURE_2D, texture_id);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   gl->ConsumeTextureCHROMIUM(texture_mailbox.target(), texture_mailbox.name());
   gl->BindTexture(GL_TEXTURE_2D, 0);

   GLuint fbo = 0;
   gl->GenFramebuffers(1, &fbo);
   gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
   gl->FramebufferTexture2D(
       GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0);
   EXPECT_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
             gl->CheckFramebufferStatus(GL_FRAMEBUFFER));

   scoped_ptr<uint8[]> pixels(new uint8[size.GetArea() * 4]);
   gl->ReadPixels(0,
                  0,
                  size.width(),
                  size.height(),
                  GL_RGBA,
                  GL_UNSIGNED_BYTE,
                  pixels.get());

   gl->DeleteFramebuffers(1, &fbo);
   gl->DeleteTextures(1, &texture_id);

   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
   bitmap->allocN32Pixels(size.width(), size.height());

   uint8* out_pixels = static_cast<uint8*>(bitmap->getPixels());

   size_t row_bytes = size.width() * 4;
   size_t total_bytes = size.height() * row_bytes;
   for (size_t dest_y = 0; dest_y < total_bytes; dest_y += row_bytes) {
     // Flip Y axis.
     size_t src_y = total_bytes - dest_y - row_bytes;
     // Swizzle OpenGL -> Skia byte order.
     for (size_t x = 0; x < row_bytes; x += 4) {
       out_pixels[dest_y + x + SK_R32_SHIFT/8] = pixels.get()[src_y + x + 0];
       out_pixels[dest_y + x + SK_G32_SHIFT/8] = pixels.get()[src_y + x + 1];
       out_pixels[dest_y + x + SK_B32_SHIFT/8] = pixels.get()[src_y + x + 2];
       out_pixels[dest_y + x + SK_A32_SHIFT/8] = pixels.get()[src_y + x + 3];
     }
   }

   return bitmap.Pass();
 }

 void LayerTreePixelTest::ReleaseTextureMailbox(
     scoped_ptr<gpu::GLInProcessContext> context,
     uint32 texture,
     uint32 sync_point,
     bool lost_resource) {
   GLES2Interface* gl = context->GetImplementation();
   if (sync_point)
     gl->WaitSyncPointCHROMIUM(sync_point);
   gl->DeleteTextures(1, &texture);
   pending_texture_mailbox_callbacks_--;
   TryEndTest();
 }

 void LayerTreePixelTest::CopyBitmapToTextureMailboxAsTexture(
     const SkBitmap& bitmap,
     TextureMailbox* texture_mailbox,
     scoped_ptr<SingleReleaseCallback>* release_callback) {
   DCHECK_GT(bitmap.width(), 0);
   DCHECK_GT(bitmap.height(), 0);

   scoped_ptr<gpu::GLInProcessContext> context = CreateTestInProcessContext();
   GLES2Interface* gl = context->GetImplementation();

   GLuint texture_id = 0;
   gl->GenTextures(1, &texture_id);
   gl->BindTexture(GL_TEXTURE_2D, texture_id);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

   DCHECK_EQ(kN32_SkColorType, bitmap.colorType());

   {
     SkAutoLockPixels lock(bitmap);

     size_t row_bytes = bitmap.width() * 4;
     size_t total_bytes = bitmap.height() * row_bytes;

     scoped_ptr<uint8[]> gl_pixels(new uint8[total_bytes]);
     uint8* bitmap_pixels = static_cast<uint8*>(bitmap.getPixels());

     for (size_t y = 0; y < total_bytes; y += row_bytes) {
       // Flip Y axis.
       size_t src_y = total_bytes - y - row_bytes;
       // Swizzle Skia -> OpenGL byte order.
       for (size_t x = 0; x < row_bytes; x += 4) {
         gl_pixels.get()[y + x + 0] = bitmap_pixels[src_y + x + SK_R32_SHIFT/8];
         gl_pixels.get()[y + x + 1] = bitmap_pixels[src_y + x + SK_G32_SHIFT/8];
         gl_pixels.get()[y + x + 2] = bitmap_pixels[src_y + x + SK_B32_SHIFT/8];
         gl_pixels.get()[y + x + 3] = bitmap_pixels[src_y + x + SK_A32_SHIFT/8];
       }
     }

     gl->TexImage2D(GL_TEXTURE_2D,
                    0,
                    GL_RGBA,
                    bitmap.width(),
                    bitmap.height(),
                    0,
                    GL_RGBA,
                    GL_UNSIGNED_BYTE,
                    gl_pixels.get());
   }

   gpu::Mailbox mailbox;
   gl->GenMailboxCHROMIUM(mailbox.name);
   gl->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
   gl->BindTexture(GL_TEXTURE_2D, 0);
   uint32 sync_point = gl->InsertSyncPointCHROMIUM();

   *texture_mailbox = TextureMailbox(mailbox, GL_TEXTURE_2D, sync_point);
   *release_callback = SingleReleaseCallback::Create(
       base::Bind(&LayerTreePixelTest::ReleaseTextureMailbox,
                  base::Unretained(this),
                  base::Passed(&context),
                  texture_id));
 }

 }  // namespace cc
	// 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 "cc/test/layer_tree_pixel_test.h"

	#include "base/command_line.h"
	#include "base/path_service.h"
	#include "cc/base/switches.h"
	#include "cc/layers/solid_color_layer.h"
	#include "cc/layers/texture_layer.h"
	#include "cc/output/copy_output_request.h"
	#include "cc/output/copy_output_result.h"
	#include "cc/resources/texture_mailbox.h"
	#include "cc/test/paths.h"
	#include "cc/test/pixel_comparator.h"
	#include "cc/test/pixel_test_output_surface.h"
	#include "cc/test/pixel_test_software_output_device.h"
	#include "cc/test/pixel_test_utils.h"
	#include "cc/test/test_in_process_context_provider.h"
	#include "cc/trees/layer_tree_impl.h"
	#include "gpu/command_buffer/client/gl_in_process_context.h"
	#include "gpu/command_buffer/client/gles2_implementation.h"

	using gpu::gles2::GLES2Interface;

	namespace cc {

	LayerTreePixelTest::LayerTreePixelTest()
	: pixel_comparator_(new ExactPixelComparator(true)),
	test_type_(PIXEL_TEST_GL),
	pending_texture_mailbox_callbacks_(0),
	impl_side_painting_(true) {
	}

	LayerTreePixelTest::~LayerTreePixelTest() {}

	scoped_ptr<OutputSurface> LayerTreePixelTest::CreateOutputSurface() {
	gfx::Size surface_expansion_size(40, 60);
	scoped_ptr<PixelTestOutputSurface> output_surface;

	switch (test_type_) {
	case PIXEL_TEST_SOFTWARE: {
	scoped_ptr<PixelTestSoftwareOutputDevice> software_output_device(
	new PixelTestSoftwareOutputDevice);
	software_output_device->set_surface_expansion_size(
	surface_expansion_size);
	output_surface = make_scoped_ptr(
	new PixelTestOutputSurface(software_output_device.Pass()));
	break;
	}
	case PIXEL_TEST_GL: {
	bool flipped_output_surface = false;
	output_surface = make_scoped_ptr(new PixelTestOutputSurface(
	new TestInProcessContextProvider, flipped_output_surface));
	break;
	}
	}

	output_surface->set_surface_expansion_size(surface_expansion_size);
	return output_surface.Pass();
	}

	void LayerTreePixelTest::CommitCompleteOnThread(LayerTreeHostImpl* impl) {
	LayerTreeImpl* commit_tree =
	impl->pending_tree() ? impl->pending_tree() : impl->active_tree();
	if (commit_tree->source_frame_number() != 0)
	return;

	gfx::Rect viewport = impl->DeviceViewport();
	// The viewport has a 0,0 origin without external influence.
	EXPECT_EQ(gfx::Point().ToString(), viewport.origin().ToString());
	// Be that influence!
	viewport += gfx::Vector2d(20, 10);
	bool resourceless_software_draw = false;
	gfx::Transform identity = gfx::Transform();
	impl->SetExternalDrawConstraints(identity,
	viewport,
	viewport,
	viewport,
	identity,
	resourceless_software_draw);
	EXPECT_EQ(viewport.ToString(), impl->DeviceViewport().ToString());
	}

	scoped_ptr<CopyOutputRequest> LayerTreePixelTest::CreateCopyOutputRequest() {
	return CopyOutputRequest::CreateBitmapRequest(
	base::Bind(&LayerTreePixelTest::ReadbackResult, base::Unretained(this)));
	}

	void LayerTreePixelTest::ReadbackResult(scoped_ptr<CopyOutputResult> result) {
	ASSERT_TRUE(result->HasBitmap());
	result_bitmap_ = result->TakeBitmap().Pass();
	EndTest();
	}

	void LayerTreePixelTest::BeginTest() {
	Layer* target = readback_target_ ? readback_target_
	: layer_tree_host()->root_layer();
	target->RequestCopyOfOutput(CreateCopyOutputRequest().Pass());
	PostSetNeedsCommitToMainThread();
	}

	void LayerTreePixelTest::AfterTest() {
	base::FilePath test_data_dir;
	EXPECT_TRUE(PathService::Get(CCPaths::DIR_TEST_DATA, &test_data_dir));
	base::FilePath ref_file_path = test_data_dir.Append(ref_file_);

	base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
	if (cmd->HasSwitch(switches::kCCRebaselinePixeltests))
	EXPECT_TRUE(WritePNGFile(*result_bitmap_, ref_file_path, true));
	EXPECT_TRUE(MatchesPNGFile(*result_bitmap_,
	ref_file_path,
	*pixel_comparator_));
	}

	scoped_refptr<SolidColorLayer> LayerTreePixelTest::CreateSolidColorLayer(
	const gfx::Rect& rect, SkColor color) {
	scoped_refptr<SolidColorLayer> layer = SolidColorLayer::Create();
	layer->SetIsDrawable(true);
	layer->SetBounds(rect.size());
	layer->SetPosition(rect.origin());
	layer->SetBackgroundColor(color);
	return layer;
	}

	void LayerTreePixelTest::EndTest() {
	// Drop TextureMailboxes on the main thread so that they can be cleaned up and
	// the pending callbacks will fire.
	for (size_t i = 0; i < texture_layers_.size(); ++i) {
	texture_layers_[i]->SetTextureMailbox(TextureMailbox(), nullptr);
	}

	TryEndTest();
	}

	void LayerTreePixelTest::TryEndTest() {
	if (!result_bitmap_)
	return;
	if (pending_texture_mailbox_callbacks_)
	return;
	LayerTreeTest::EndTest();
	}

	scoped_refptr<SolidColorLayer> LayerTreePixelTest::
	CreateSolidColorLayerWithBorder(
	const gfx::Rect& rect, SkColor color,
	int border_width, SkColor border_color) {
	scoped_refptr<SolidColorLayer> layer = CreateSolidColorLayer(rect, color);
	scoped_refptr<SolidColorLayer> border_top = CreateSolidColorLayer(
	gfx::Rect(0, 0, rect.width(), border_width), border_color);
	scoped_refptr<SolidColorLayer> border_left = CreateSolidColorLayer(
	gfx::Rect(0,
	border_width,
	border_width,
	rect.height() - border_width * 2),
	border_color);
	scoped_refptr<SolidColorLayer> border_right =
	CreateSolidColorLayer(gfx::Rect(rect.width() - border_width,
	border_width,
	border_width,
	rect.height() - border_width * 2),
	border_color);
	scoped_refptr<SolidColorLayer> border_bottom = CreateSolidColorLayer(
	gfx::Rect(0, rect.height() - border_width, rect.width(), border_width),
	border_color);
	layer->AddChild(border_top);
	layer->AddChild(border_left);
	layer->AddChild(border_right);
	layer->AddChild(border_bottom);
	return layer;
	}

	scoped_refptr<TextureLayer> LayerTreePixelTest::CreateTextureLayer(
	const gfx::Rect& rect, const SkBitmap& bitmap) {
	scoped_refptr<TextureLayer> layer = TextureLayer::CreateForMailbox(NULL);
	layer->SetIsDrawable(true);
	layer->SetBounds(rect.size());
	layer->SetPosition(rect.origin());

	TextureMailbox texture_mailbox;
	scoped_ptr<SingleReleaseCallback> release_callback;
	CopyBitmapToTextureMailboxAsTexture(
	bitmap, &texture_mailbox, &release_callback);
	layer->SetTextureMailbox(texture_mailbox, release_callback.Pass());

	texture_layers_.push_back(layer);
	pending_texture_mailbox_callbacks_++;
	return layer;
	}

	void LayerTreePixelTest::RunPixelTest(
	PixelTestType test_type,
	scoped_refptr<Layer> content_root,
	base::FilePath file_name) {
	test_type_ = test_type;
	content_root_ = content_root;
	readback_target_ = NULL;
	ref_file_ = file_name;
	bool threaded = true;
	RunTest(threaded, false, impl_side_painting_);
	}

	void LayerTreePixelTest::RunSingleThreadedPixelTest(
	PixelTestType test_type,
	scoped_refptr<Layer> content_root,
	base::FilePath file_name) {
	test_type_ = test_type;
	content_root_ = content_root;
	readback_target_ = NULL;
	ref_file_ = file_name;
	bool threaded = false;
	RunTest(threaded, false, impl_side_painting_);
	}

	void LayerTreePixelTest::RunPixelTestWithReadbackTarget(
	PixelTestType test_type,
	scoped_refptr<Layer> content_root,
	Layer* target,
	base::FilePath file_name) {
	test_type_ = test_type;
	content_root_ = content_root;
	readback_target_ = target;
	ref_file_ = file_name;
	RunTest(true, false, impl_side_painting_);
	}

	void LayerTreePixelTest::SetupTree() {
	scoped_refptr<Layer> root = Layer::Create();
	root->SetBounds(content_root_->bounds());
	root->AddChild(content_root_);
	layer_tree_host()->SetRootLayer(root);
	LayerTreeTest::SetupTree();
	}

	scoped_ptr<SkBitmap> LayerTreePixelTest::CopyTextureMailboxToBitmap(
	const gfx::Size& size,
	const TextureMailbox& texture_mailbox) {
	DCHECK(texture_mailbox.IsTexture());
	if (!texture_mailbox.IsTexture())
	return nullptr;

	scoped_ptr<gpu::GLInProcessContext> context = CreateTestInProcessContext();
	GLES2Interface* gl = context->GetImplementation();

	if (texture_mailbox.sync_point())
	gl->WaitSyncPointCHROMIUM(texture_mailbox.sync_point());

	GLuint texture_id = 0;
	gl->GenTextures(1, &texture_id);
	gl->BindTexture(GL_TEXTURE_2D, texture_id);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	gl->ConsumeTextureCHROMIUM(texture_mailbox.target(), texture_mailbox.name());
	gl->BindTexture(GL_TEXTURE_2D, 0);

	GLuint fbo = 0;
	gl->GenFramebuffers(1, &fbo);
	gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
	gl->FramebufferTexture2D(
	GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0);
	EXPECT_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
	gl->CheckFramebufferStatus(GL_FRAMEBUFFER));

	scoped_ptr<uint8[]> pixels(new uint8[size.GetArea() * 4]);
	gl->ReadPixels(0,
	0,
	size.width(),
	size.height(),
	GL_RGBA,
	GL_UNSIGNED_BYTE,
	pixels.get());

	gl->DeleteFramebuffers(1, &fbo);
	gl->DeleteTextures(1, &texture_id);

	scoped_ptr<SkBitmap> bitmap(new SkBitmap);
	bitmap->allocN32Pixels(size.width(), size.height());

	uint8* out_pixels = static_cast<uint8*>(bitmap->getPixels());

	size_t row_bytes = size.width() * 4;
	size_t total_bytes = size.height() * row_bytes;
	for (size_t dest_y = 0; dest_y < total_bytes; dest_y += row_bytes) {
	// Flip Y axis.
	size_t src_y = total_bytes - dest_y - row_bytes;
	// Swizzle OpenGL -> Skia byte order.
	for (size_t x = 0; x < row_bytes; x += 4) {
	out_pixels[dest_y + x + SK_R32_SHIFT/8] = pixels.get()[src_y + x + 0];
	out_pixels[dest_y + x + SK_G32_SHIFT/8] = pixels.get()[src_y + x + 1];
	out_pixels[dest_y + x + SK_B32_SHIFT/8] = pixels.get()[src_y + x + 2];
	out_pixels[dest_y + x + SK_A32_SHIFT/8] = pixels.get()[src_y + x + 3];
	}
	}

	return bitmap.Pass();
	}

	void LayerTreePixelTest::ReleaseTextureMailbox(
	scoped_ptr<gpu::GLInProcessContext> context,
	uint32 texture,
	uint32 sync_point,
	bool lost_resource) {
	GLES2Interface* gl = context->GetImplementation();
	if (sync_point)
	gl->WaitSyncPointCHROMIUM(sync_point);
	gl->DeleteTextures(1, &texture);
	pending_texture_mailbox_callbacks_--;
	TryEndTest();
	}

	void LayerTreePixelTest::CopyBitmapToTextureMailboxAsTexture(
	const SkBitmap& bitmap,
	TextureMailbox* texture_mailbox,
	scoped_ptr<SingleReleaseCallback>* release_callback) {
	DCHECK_GT(bitmap.width(), 0);
	DCHECK_GT(bitmap.height(), 0);

	scoped_ptr<gpu::GLInProcessContext> context = CreateTestInProcessContext();
	GLES2Interface* gl = context->GetImplementation();

	GLuint texture_id = 0;
	gl->GenTextures(1, &texture_id);
	gl->BindTexture(GL_TEXTURE_2D, texture_id);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

	DCHECK_EQ(kN32_SkColorType, bitmap.colorType());

	{
	SkAutoLockPixels lock(bitmap);

	size_t row_bytes = bitmap.width() * 4;
	size_t total_bytes = bitmap.height() * row_bytes;

	scoped_ptr<uint8[]> gl_pixels(new uint8[total_bytes]);
	uint8* bitmap_pixels = static_cast<uint8*>(bitmap.getPixels());

	for (size_t y = 0; y < total_bytes; y += row_bytes) {
	// Flip Y axis.
	size_t src_y = total_bytes - y - row_bytes;
	// Swizzle Skia -> OpenGL byte order.
	for (size_t x = 0; x < row_bytes; x += 4) {
	gl_pixels.get()[y + x + 0] = bitmap_pixels[src_y + x + SK_R32_SHIFT/8];
	gl_pixels.get()[y + x + 1] = bitmap_pixels[src_y + x + SK_G32_SHIFT/8];
	gl_pixels.get()[y + x + 2] = bitmap_pixels[src_y + x + SK_B32_SHIFT/8];
	gl_pixels.get()[y + x + 3] = bitmap_pixels[src_y + x + SK_A32_SHIFT/8];
	}
	}

	gl->TexImage2D(GL_TEXTURE_2D,
	0,
	GL_RGBA,
	bitmap.width(),
	bitmap.height(),
	0,
	GL_RGBA,
	GL_UNSIGNED_BYTE,
	gl_pixels.get());
	}

	gpu::Mailbox mailbox;
	gl->GenMailboxCHROMIUM(mailbox.name);
	gl->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
	gl->BindTexture(GL_TEXTURE_2D, 0);
	uint32 sync_point = gl->InsertSyncPointCHROMIUM();

	*texture_mailbox = TextureMailbox(mailbox, GL_TEXTURE_2D, sync_point);
	*release_callback = SingleReleaseCallback::Create(
	base::Bind(&LayerTreePixelTest::ReleaseTextureMailbox,
	base::Unretained(this),
	base::Passed(&context),
	texture_id));
	}

	} // namespace cc