cc/video_layer_impl.cc - chromium/src.git - Git at Google

 // Copyright 2011 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 "config.h"

 #include "cc/video_layer_impl.h"

 #include "base/logging.h"
 #include "cc/io_surface_draw_quad.h"
 #include "cc/layer_tree_host_impl.h"
 #include "cc/proxy.h"
 #include "cc/quad_sink.h"
 #include "cc/resource_provider.h"
 #include "cc/stream_video_draw_quad.h"
 #include "cc/texture_draw_quad.h"
 #include "cc/yuv_video_draw_quad.h"
 #include "media/filters/skcanvas_video_renderer.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"

 namespace cc {

 VideoLayerImpl::VideoLayerImpl(int id, WebKit::WebVideoFrameProvider* provider,
                                const FrameUnwrapper& unwrapper)
     : LayerImpl(id)
     , m_provider(provider)
     , m_unwrapper(unwrapper)
     , m_webFrame(0)
     , m_frame(0)
     , m_format(GL_INVALID_VALUE)
     , m_convertYUV(false)
     , m_externalTextureResource(0)
 {
     // This matrix is the default transformation for stream textures, and flips on the Y axis.
     m_streamTextureMatrix = WebKit::WebTransformationMatrix(
         1, 0, 0, 0,
         0, -1, 0, 0,
         0, 0, 1, 0,
         0, 1, 0, 1);

     // This only happens during a commit on the compositor thread while the main
     // thread is blocked. That makes this a thread-safe call to set the video
     // frame provider client that does not require a lock. The same is true of
     // the call in the destructor.
     DCHECK(Proxy::isMainThreadBlocked());
     m_provider->setVideoFrameProviderClient(this);
 }

 VideoLayerImpl::~VideoLayerImpl()
 {
     // See comment in constructor for why this doesn't need a lock.
     DCHECK(Proxy::isMainThreadBlocked());
     if (m_provider) {
         m_provider->setVideoFrameProviderClient(0);
         m_provider = 0;
     }
     freePlaneData(layerTreeHostImpl()->resourceProvider());

 #ifndef NDEBUG
     for (size_t i = 0; i < media::VideoFrame::kMaxPlanes; ++i)
         DCHECK(!m_framePlanes[i].resourceId);
     DCHECK(!m_externalTextureResource);
 #endif
 }

 void VideoLayerImpl::stopUsingProvider()
 {
     // Block the provider from shutting down until this client is done
     // using the frame.
     base::AutoLock locker(m_providerLock);
     DCHECK(!m_frame);
     m_provider = 0;
 }

 // Convert media::VideoFrame::Format to OpenGL enum values.
 static GLenum convertVFCFormatToGLenum(const media::VideoFrame& frame)
 {
     switch (frame.format()) {
     case media::VideoFrame::YV12:
     case media::VideoFrame::YV16:
         return GL_LUMINANCE;
     case media::VideoFrame::NATIVE_TEXTURE:
         return frame.texture_target();
     case media::VideoFrame::INVALID:
     case media::VideoFrame::RGB32:
     case media::VideoFrame::EMPTY:
     case media::VideoFrame::I420:
         NOTREACHED();
         break;
     }
     return GL_INVALID_VALUE;
 }

 size_t VideoLayerImpl::numPlanes() const
 {
     if (!m_frame)
         return 0;

     if (m_convertYUV)
         return 1;

     switch (m_frame->format()) {
     case media::VideoFrame::RGB32:
         return 1;
     case media::VideoFrame::YV12:
     case media::VideoFrame::YV16:
         return 3;
     case media::VideoFrame::INVALID:
     case media::VideoFrame::EMPTY:
     case media::VideoFrame::I420:
         break;
     case media::VideoFrame::NATIVE_TEXTURE:
         return 0;
     }
     NOTREACHED();
     return 0;
 }

 void VideoLayerImpl::willDraw(ResourceProvider* resourceProvider)
 {
     DCHECK(Proxy::isImplThread());
     LayerImpl::willDraw(resourceProvider);

     // Explicitly acquire and release the provider mutex so it can be held from
     // willDraw to didDraw. Since the compositor thread is in the middle of
     // drawing, the layer will not be destroyed before didDraw is called.
     // Therefore, the only thing that will prevent this lock from being released
     // is the GPU process locking it. As the GPU process can't cause the
     // destruction of the provider (calling stopUsingProvider), holding this
     // lock should not cause a deadlock.
     m_providerLock.Acquire();

     willDrawInternal(resourceProvider);
     freeUnusedPlaneData(resourceProvider);

     if (!m_frame)
         m_providerLock.Release();
 }

 void VideoLayerImpl::willDrawInternal(ResourceProvider* resourceProvider)
 {
     DCHECK(Proxy::isImplThread());
     DCHECK(!m_externalTextureResource);

     if (!m_provider) {
         m_frame = 0;
         return;
     }

     m_webFrame = m_provider->getCurrentFrame();
     m_frame = m_unwrapper.Run(m_webFrame);

     if (!m_frame)
         return;

     m_format = convertVFCFormatToGLenum(*m_frame);

     if (m_format == GL_INVALID_VALUE) {
         m_provider->putCurrentFrame(m_webFrame);
         m_frame = 0;
         return;
     }

     // FIXME: If we're in software compositing mode, we do the YUV -> RGB
     // conversion here. That involves an extra copy of each frame to a bitmap.
     // Obviously, this is suboptimal and should be addressed once ubercompositor
     // starts shaping up.
     m_convertYUV = resourceProvider->defaultResourceType() == ResourceProvider::Bitmap &&
         (m_frame->format() == media::VideoFrame::YV12 ||
          m_frame->format() == media::VideoFrame::YV16);

     if (m_convertYUV)
         m_format = GL_RGBA;

     if (!allocatePlaneData(resourceProvider)) {
         m_provider->putCurrentFrame(m_webFrame);
         m_frame = 0;
         return;
     }

     if (!copyPlaneData(resourceProvider)) {
         m_provider->putCurrentFrame(m_webFrame);
         m_frame = 0;
         return;
     }

     if (m_format == GL_TEXTURE_2D)
         m_externalTextureResource = resourceProvider->createResourceFromExternalTexture(m_frame->texture_id());
 }

 void VideoLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuadsData)
 {
     DCHECK(Proxy::isImplThread());

     if (!m_frame)
         return;

     SharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
     appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);

     // FIXME: When we pass quads out of process, we need to double-buffer, or
     // otherwise synchonize use of all textures in the quad.

     gfx::Rect quadRect(gfx::Point(), contentBounds());

     switch (m_format) {
     case GL_LUMINANCE: {
         // YUV software decoder.
         const FramePlane& yPlane = m_framePlanes[media::VideoFrame::kYPlane];
         const FramePlane& uPlane = m_framePlanes[media::VideoFrame::kUPlane];
         const FramePlane& vPlane = m_framePlanes[media::VideoFrame::kVPlane];
         scoped_ptr<YUVVideoDrawQuad> yuvVideoQuad = YUVVideoDrawQuad::create(sharedQuadState, quadRect, yPlane, uPlane, vPlane);
         quadSink.append(yuvVideoQuad.PassAs<DrawQuad>(), appendQuadsData);
         break;
     }
     case GL_RGBA: {
         // RGBA software decoder.
         const FramePlane& plane = m_framePlanes[media::VideoFrame::kRGBPlane];
         bool premultipliedAlpha = true;
         float widthScaleFactor = static_cast<float>(plane.visibleSize.width()) / plane.size.width();
         gfx::RectF uvRect(widthScaleFactor, 1);
         bool flipped = false;
         scoped_ptr<TextureDrawQuad> textureQuad = TextureDrawQuad::create(sharedQuadState, quadRect, plane.resourceId, premultipliedAlpha, uvRect, flipped);
         quadSink.append(textureQuad.PassAs<DrawQuad>(), appendQuadsData);
         break;
     }
     case GL_TEXTURE_2D: {
         // NativeTexture hardware decoder.
         bool premultipliedAlpha = true;
         gfx::RectF uvRect(1, 1);
         bool flipped = false;
         scoped_ptr<TextureDrawQuad> textureQuad = TextureDrawQuad::create(sharedQuadState, quadRect, m_externalTextureResource, premultipliedAlpha, uvRect, flipped);
         quadSink.append(textureQuad.PassAs<DrawQuad>(), appendQuadsData);
         break;
     }
     case GL_TEXTURE_RECTANGLE_ARB: {
         scoped_ptr<IOSurfaceDrawQuad> ioSurfaceQuad = IOSurfaceDrawQuad::create(sharedQuadState, quadRect, m_frame->data_size(), m_frame->texture_id(), IOSurfaceDrawQuad::Unflipped);
         quadSink.append(ioSurfaceQuad.PassAs<DrawQuad>(), appendQuadsData);
         break;
     }
     case GL_TEXTURE_EXTERNAL_OES: {
         // StreamTexture hardware decoder.
         scoped_ptr<StreamVideoDrawQuad> streamVideoQuad = StreamVideoDrawQuad::create(sharedQuadState, quadRect, m_frame->texture_id(), m_streamTextureMatrix);
         quadSink.append(streamVideoQuad.PassAs<DrawQuad>(), appendQuadsData);
         break;
     }
     default:
         NOTREACHED();  // Someone updated convertVFCFormatToGLenum above but update this!
         break;
     }
 }

 void VideoLayerImpl::didDraw(ResourceProvider* resourceProvider)
 {
     DCHECK(Proxy::isImplThread());
     LayerImpl::didDraw(resourceProvider);

     if (!m_frame)
         return;

     if (m_format == GL_TEXTURE_2D) {
         DCHECK(m_externalTextureResource);
         // FIXME: the following assert will not be true when sending resources to a
         // parent compositor. We will probably need to hold on to m_frame for
         // longer, and have several "current frames" in the pipeline.
         DCHECK(!resourceProvider->inUseByConsumer(m_externalTextureResource));
         resourceProvider->deleteResource(m_externalTextureResource);
         m_externalTextureResource = 0;
     }

     m_provider->putCurrentFrame(m_webFrame);
     m_frame = 0;

     m_providerLock.Release();
 }

 static int videoFrameDimension(int originalDimension, size_t plane, int format)
 {
     if (format == media::VideoFrame::YV12 && plane != media::VideoFrame::kYPlane)
         return originalDimension / 2;
     return originalDimension;
 }

 static bool hasPaddingBytes(const media::VideoFrame& frame, size_t plane)
 {
     return frame.stride(plane) > videoFrameDimension(frame.data_size().width(), plane, frame.format());
 }

 gfx::Size computeVisibleSize(const media::VideoFrame& frame, size_t plane)
 {
     int visibleWidth = videoFrameDimension(frame.data_size().width(), plane, frame.format());
     int originalWidth = visibleWidth;
     int visibleHeight = videoFrameDimension(frame.data_size().height(), plane, frame.format());

     // When there are dead pixels at the edge of the texture, decrease
     // the frame width by 1 to prevent the rightmost pixels from
     // interpolating with the dead pixels.
     if (hasPaddingBytes(frame, plane))
         --visibleWidth;

     // In YV12, every 2x2 square of Y values corresponds to one U and
     // one V value. If we decrease the width of the UV plane, we must decrease the
     // width of the Y texture by 2 for proper alignment. This must happen
     // always, even if Y's texture does not have padding bytes.
     if (plane == media::VideoFrame::kYPlane && frame.format() == media::VideoFrame::YV12) {
         if (hasPaddingBytes(frame, media::VideoFrame::kUPlane))
             visibleWidth = originalWidth - 2;
     }

     return gfx::Size(visibleWidth, visibleHeight);
 }

 bool VideoLayerImpl::FramePlane::allocateData(ResourceProvider* resourceProvider)
 {
     if (resourceId)
         return true;

     resourceId = resourceProvider->createResource(Renderer::ImplPool, size, format, ResourceProvider::TextureUsageAny);
     return resourceId;
 }

 void VideoLayerImpl::FramePlane::freeData(ResourceProvider* resourceProvider)
 {
     if (!resourceId)
         return;

     resourceProvider->deleteResource(resourceId);
     resourceId = 0;
 }

 bool VideoLayerImpl::allocatePlaneData(ResourceProvider* resourceProvider)
 {
     const int maxTextureSize = resourceProvider->maxTextureSize();
     const size_t planeCount = numPlanes();
     for (size_t planeIndex = 0; planeIndex < planeCount; ++planeIndex) {
         VideoLayerImpl::FramePlane& plane = m_framePlanes[planeIndex];

         gfx::Size requiredTextureSize(m_frame->stride(planeIndex), videoFrameDimension(m_frame->data_size().height(), planeIndex, m_frame->format()));
         // FIXME: Remove the test against maxTextureSize when tiled layers are implemented.
         if (requiredTextureSize.IsEmpty() || requiredTextureSize.width() > maxTextureSize || requiredTextureSize.height() > maxTextureSize)
             return false;

         if (plane.size != requiredTextureSize || plane.format != m_format) {
             plane.freeData(resourceProvider);
             plane.size = requiredTextureSize;
             plane.format = m_format;
         }

         if (!plane.resourceId) {
             if (!plane.allocateData(resourceProvider))
                 return false;
             plane.visibleSize = computeVisibleSize(*m_frame, planeIndex);
         }
     }
     return true;
 }

 bool VideoLayerImpl::copyPlaneData(ResourceProvider* resourceProvider)
 {
     const size_t planeCount = numPlanes();
     if (!planeCount)
         return true;

     if (m_convertYUV) {
         if (!m_videoRenderer)
             m_videoRenderer.reset(new media::SkCanvasVideoRenderer);
         VideoLayerImpl::FramePlane& plane = m_framePlanes[media::VideoFrame::kRGBPlane];
         ResourceProvider::ScopedWriteLockSoftware lock(resourceProvider, plane.resourceId);
         m_videoRenderer->Paint(m_frame, lock.skCanvas(), gfx::Rect(plane.size), 0xFF);
         return true;
     }

     for (size_t planeIndex = 0; planeIndex < planeCount; ++planeIndex) {
         VideoLayerImpl::FramePlane& plane = m_framePlanes[planeIndex];
         const uint8_t* softwarePlanePixels = m_frame->data(planeIndex);
         gfx::Rect planeRect(gfx::Point(), plane.size);
         resourceProvider->setPixels(plane.resourceId, softwarePlanePixels, planeRect, planeRect, gfx::Vector2d());
     }
     return true;
 }

 void VideoLayerImpl::freePlaneData(ResourceProvider* resourceProvider)
 {
     for (size_t i = 0; i < media::VideoFrame::kMaxPlanes; ++i)
         m_framePlanes[i].freeData(resourceProvider);
 }

 void VideoLayerImpl::freeUnusedPlaneData(ResourceProvider* resourceProvider)
 {
     size_t firstUnusedPlane = numPlanes();
     for (size_t i = firstUnusedPlane; i < media::VideoFrame::kMaxPlanes; ++i)
         m_framePlanes[i].freeData(resourceProvider);
 }

 void VideoLayerImpl::didReceiveFrame()
 {
     setNeedsRedraw();
 }

 void VideoLayerImpl::didUpdateMatrix(const float matrix[16])
 {
     m_streamTextureMatrix = WebKit::WebTransformationMatrix(
         matrix[0], matrix[1], matrix[2], matrix[3],
         matrix[4], matrix[5], matrix[6], matrix[7],
         matrix[8], matrix[9], matrix[10], matrix[11],
         matrix[12], matrix[13], matrix[14], matrix[15]);
     setNeedsRedraw();
 }

 void VideoLayerImpl::didLoseContext()
 {
     freePlaneData(layerTreeHostImpl()->resourceProvider());
 }

 void VideoLayerImpl::setNeedsRedraw()
 {
     layerTreeHostImpl()->setNeedsRedraw();
 }

 void VideoLayerImpl::dumpLayerProperties(std::string* str, int indent) const
 {
     str->append(indentString(indent));
     str->append("video layer\n");
     LayerImpl::dumpLayerProperties(str, indent);
 }

 const char* VideoLayerImpl::layerTypeAsString() const
 {
     return "VideoLayer";
 }

 }
	// Copyright 2011 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 "config.h"

	#include "cc/video_layer_impl.h"

	#include "base/logging.h"
	#include "cc/io_surface_draw_quad.h"
	#include "cc/layer_tree_host_impl.h"
	#include "cc/proxy.h"
	#include "cc/quad_sink.h"
	#include "cc/resource_provider.h"
	#include "cc/stream_video_draw_quad.h"
	#include "cc/texture_draw_quad.h"
	#include "cc/yuv_video_draw_quad.h"
	#include "media/filters/skcanvas_video_renderer.h"
	#include "third_party/khronos/GLES2/gl2.h"
	#include "third_party/khronos/GLES2/gl2ext.h"

	namespace cc {

	VideoLayerImpl::VideoLayerImpl(int id, WebKit::WebVideoFrameProvider* provider,
	const FrameUnwrapper& unwrapper)
	: LayerImpl(id)
	, m_provider(provider)
	, m_unwrapper(unwrapper)
	, m_webFrame(0)
	, m_frame(0)
	, m_format(GL_INVALID_VALUE)
	, m_convertYUV(false)
	, m_externalTextureResource(0)
	{
	// This matrix is the default transformation for stream textures, and flips on the Y axis.
	m_streamTextureMatrix = WebKit::WebTransformationMatrix(
	1, 0, 0, 0,
	0, -1, 0, 0,
	0, 0, 1, 0,
	0, 1, 0, 1);

	// This only happens during a commit on the compositor thread while the main
	// thread is blocked. That makes this a thread-safe call to set the video
	// frame provider client that does not require a lock. The same is true of
	// the call in the destructor.
	DCHECK(Proxy::isMainThreadBlocked());
	m_provider->setVideoFrameProviderClient(this);
	}

	VideoLayerImpl::~VideoLayerImpl()
	{
	// See comment in constructor for why this doesn't need a lock.
	DCHECK(Proxy::isMainThreadBlocked());
	if (m_provider) {
	m_provider->setVideoFrameProviderClient(0);
	m_provider = 0;
	}
	freePlaneData(layerTreeHostImpl()->resourceProvider());

	#ifndef NDEBUG
	for (size_t i = 0; i < media::VideoFrame::kMaxPlanes; ++i)
	DCHECK(!m_framePlanes[i].resourceId);
	DCHECK(!m_externalTextureResource);
	#endif
	}

	void VideoLayerImpl::stopUsingProvider()
	{
	// Block the provider from shutting down until this client is done
	// using the frame.
	base::AutoLock locker(m_providerLock);
	DCHECK(!m_frame);
	m_provider = 0;
	}

	// Convert media::VideoFrame::Format to OpenGL enum values.
	static GLenum convertVFCFormatToGLenum(const media::VideoFrame& frame)
	{
	switch (frame.format()) {
	case media::VideoFrame::YV12:
	case media::VideoFrame::YV16:
	return GL_LUMINANCE;
	case media::VideoFrame::NATIVE_TEXTURE:
	return frame.texture_target();
	case media::VideoFrame::INVALID:
	case media::VideoFrame::RGB32:
	case media::VideoFrame::EMPTY:
	case media::VideoFrame::I420:
	NOTREACHED();
	break;
	}
	return GL_INVALID_VALUE;
	}

	size_t VideoLayerImpl::numPlanes() const
	{
	if (!m_frame)
	return 0;

	if (m_convertYUV)
	return 1;

	switch (m_frame->format()) {
	case media::VideoFrame::RGB32:
	return 1;
	case media::VideoFrame::YV12:
	case media::VideoFrame::YV16:
	return 3;
	case media::VideoFrame::INVALID:
	case media::VideoFrame::EMPTY:
	case media::VideoFrame::I420:
	break;
	case media::VideoFrame::NATIVE_TEXTURE:
	return 0;
	}
	NOTREACHED();
	return 0;
	}

	void VideoLayerImpl::willDraw(ResourceProvider* resourceProvider)
	{
	DCHECK(Proxy::isImplThread());
	LayerImpl::willDraw(resourceProvider);

	// Explicitly acquire and release the provider mutex so it can be held from
	// willDraw to didDraw. Since the compositor thread is in the middle of
	// drawing, the layer will not be destroyed before didDraw is called.
	// Therefore, the only thing that will prevent this lock from being released
	// is the GPU process locking it. As the GPU process can't cause the
	// destruction of the provider (calling stopUsingProvider), holding this
	// lock should not cause a deadlock.
	m_providerLock.Acquire();

	willDrawInternal(resourceProvider);
	freeUnusedPlaneData(resourceProvider);

	if (!m_frame)
	m_providerLock.Release();
	}

	void VideoLayerImpl::willDrawInternal(ResourceProvider* resourceProvider)
	{
	DCHECK(Proxy::isImplThread());
	DCHECK(!m_externalTextureResource);

	if (!m_provider) {
	m_frame = 0;
	return;
	}

	m_webFrame = m_provider->getCurrentFrame();
	m_frame = m_unwrapper.Run(m_webFrame);

	if (!m_frame)
	return;

	m_format = convertVFCFormatToGLenum(*m_frame);

	if (m_format == GL_INVALID_VALUE) {
	m_provider->putCurrentFrame(m_webFrame);
	m_frame = 0;
	return;
	}

	// FIXME: If we're in software compositing mode, we do the YUV -> RGB
	// conversion here. That involves an extra copy of each frame to a bitmap.
	// Obviously, this is suboptimal and should be addressed once ubercompositor
	// starts shaping up.
	m_convertYUV = resourceProvider->defaultResourceType() == ResourceProvider::Bitmap &&
	(m_frame->format() == media::VideoFrame::YV12 \|\|
	m_frame->format() == media::VideoFrame::YV16);

	if (m_convertYUV)
	m_format = GL_RGBA;

	if (!allocatePlaneData(resourceProvider)) {
	m_provider->putCurrentFrame(m_webFrame);
	m_frame = 0;
	return;
	}

	if (!copyPlaneData(resourceProvider)) {
	m_provider->putCurrentFrame(m_webFrame);
	m_frame = 0;
	return;
	}

	if (m_format == GL_TEXTURE_2D)
	m_externalTextureResource = resourceProvider->createResourceFromExternalTexture(m_frame->texture_id());
	}

	void VideoLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuadsData)
	{
	DCHECK(Proxy::isImplThread());

	if (!m_frame)
	return;

	SharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
	appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);

	// FIXME: When we pass quads out of process, we need to double-buffer, or
	// otherwise synchonize use of all textures in the quad.

	gfx::Rect quadRect(gfx::Point(), contentBounds());

	switch (m_format) {
	case GL_LUMINANCE: {
	// YUV software decoder.
	const FramePlane& yPlane = m_framePlanes[media::VideoFrame::kYPlane];
	const FramePlane& uPlane = m_framePlanes[media::VideoFrame::kUPlane];
	const FramePlane& vPlane = m_framePlanes[media::VideoFrame::kVPlane];
	scoped_ptr<YUVVideoDrawQuad> yuvVideoQuad = YUVVideoDrawQuad::create(sharedQuadState, quadRect, yPlane, uPlane, vPlane);
	quadSink.append(yuvVideoQuad.PassAs<DrawQuad>(), appendQuadsData);
	break;
	}
	case GL_RGBA: {
	// RGBA software decoder.
	const FramePlane& plane = m_framePlanes[media::VideoFrame::kRGBPlane];
	bool premultipliedAlpha = true;
	float widthScaleFactor = static_cast<float>(plane.visibleSize.width()) / plane.size.width();
	gfx::RectF uvRect(widthScaleFactor, 1);
	bool flipped = false;
	scoped_ptr<TextureDrawQuad> textureQuad = TextureDrawQuad::create(sharedQuadState, quadRect, plane.resourceId, premultipliedAlpha, uvRect, flipped);
	quadSink.append(textureQuad.PassAs<DrawQuad>(), appendQuadsData);
	break;
	}
	case GL_TEXTURE_2D: {
	// NativeTexture hardware decoder.
	bool premultipliedAlpha = true;
	gfx::RectF uvRect(1, 1);
	bool flipped = false;
	scoped_ptr<TextureDrawQuad> textureQuad = TextureDrawQuad::create(sharedQuadState, quadRect, m_externalTextureResource, premultipliedAlpha, uvRect, flipped);
	quadSink.append(textureQuad.PassAs<DrawQuad>(), appendQuadsData);
	break;
	}
	case GL_TEXTURE_RECTANGLE_ARB: {
	scoped_ptr<IOSurfaceDrawQuad> ioSurfaceQuad = IOSurfaceDrawQuad::create(sharedQuadState, quadRect, m_frame->data_size(), m_frame->texture_id(), IOSurfaceDrawQuad::Unflipped);
	quadSink.append(ioSurfaceQuad.PassAs<DrawQuad>(), appendQuadsData);
	break;
	}
	case GL_TEXTURE_EXTERNAL_OES: {
	// StreamTexture hardware decoder.
	scoped_ptr<StreamVideoDrawQuad> streamVideoQuad = StreamVideoDrawQuad::create(sharedQuadState, quadRect, m_frame->texture_id(), m_streamTextureMatrix);
	quadSink.append(streamVideoQuad.PassAs<DrawQuad>(), appendQuadsData);
	break;
	}
	default:
	NOTREACHED(); // Someone updated convertVFCFormatToGLenum above but update this!
	break;
	}
	}

	void VideoLayerImpl::didDraw(ResourceProvider* resourceProvider)
	{
	DCHECK(Proxy::isImplThread());
	LayerImpl::didDraw(resourceProvider);

	if (!m_frame)
	return;

	if (m_format == GL_TEXTURE_2D) {
	DCHECK(m_externalTextureResource);
	// FIXME: the following assert will not be true when sending resources to a
	// parent compositor. We will probably need to hold on to m_frame for
	// longer, and have several "current frames" in the pipeline.
	DCHECK(!resourceProvider->inUseByConsumer(m_externalTextureResource));
	resourceProvider->deleteResource(m_externalTextureResource);
	m_externalTextureResource = 0;
	}

	m_provider->putCurrentFrame(m_webFrame);
	m_frame = 0;

	m_providerLock.Release();
	}

	static int videoFrameDimension(int originalDimension, size_t plane, int format)
	{
	if (format == media::VideoFrame::YV12 && plane != media::VideoFrame::kYPlane)
	return originalDimension / 2;
	return originalDimension;
	}

	static bool hasPaddingBytes(const media::VideoFrame& frame, size_t plane)
	{
	return frame.stride(plane) > videoFrameDimension(frame.data_size().width(), plane, frame.format());
	}

	gfx::Size computeVisibleSize(const media::VideoFrame& frame, size_t plane)
	{
	int visibleWidth = videoFrameDimension(frame.data_size().width(), plane, frame.format());
	int originalWidth = visibleWidth;
	int visibleHeight = videoFrameDimension(frame.data_size().height(), plane, frame.format());

	// When there are dead pixels at the edge of the texture, decrease
	// the frame width by 1 to prevent the rightmost pixels from
	// interpolating with the dead pixels.
	if (hasPaddingBytes(frame, plane))
	--visibleWidth;

	// In YV12, every 2x2 square of Y values corresponds to one U and
	// one V value. If we decrease the width of the UV plane, we must decrease the
	// width of the Y texture by 2 for proper alignment. This must happen
	// always, even if Y's texture does not have padding bytes.
	if (plane == media::VideoFrame::kYPlane && frame.format() == media::VideoFrame::YV12) {
	if (hasPaddingBytes(frame, media::VideoFrame::kUPlane))
	visibleWidth = originalWidth - 2;
	}

	return gfx::Size(visibleWidth, visibleHeight);
	}

	bool VideoLayerImpl::FramePlane::allocateData(ResourceProvider* resourceProvider)
	{
	if (resourceId)
	return true;

	resourceId = resourceProvider->createResource(Renderer::ImplPool, size, format, ResourceProvider::TextureUsageAny);
	return resourceId;
	}

	void VideoLayerImpl::FramePlane::freeData(ResourceProvider* resourceProvider)
	{
	if (!resourceId)
	return;

	resourceProvider->deleteResource(resourceId);
	resourceId = 0;
	}

	bool VideoLayerImpl::allocatePlaneData(ResourceProvider* resourceProvider)
	{
	const int maxTextureSize = resourceProvider->maxTextureSize();
	const size_t planeCount = numPlanes();
	for (size_t planeIndex = 0; planeIndex < planeCount; ++planeIndex) {
	VideoLayerImpl::FramePlane& plane = m_framePlanes[planeIndex];

	gfx::Size requiredTextureSize(m_frame->stride(planeIndex), videoFrameDimension(m_frame->data_size().height(), planeIndex, m_frame->format()));
	// FIXME: Remove the test against maxTextureSize when tiled layers are implemented.
	if (requiredTextureSize.IsEmpty() \|\| requiredTextureSize.width() > maxTextureSize \|\| requiredTextureSize.height() > maxTextureSize)
	return false;

	if (plane.size != requiredTextureSize \|\| plane.format != m_format) {
	plane.freeData(resourceProvider);
	plane.size = requiredTextureSize;
	plane.format = m_format;
	}

	if (!plane.resourceId) {
	if (!plane.allocateData(resourceProvider))
	return false;
	plane.visibleSize = computeVisibleSize(*m_frame, planeIndex);
	}
	}
	return true;
	}

	bool VideoLayerImpl::copyPlaneData(ResourceProvider* resourceProvider)
	{
	const size_t planeCount = numPlanes();
	if (!planeCount)
	return true;

	if (m_convertYUV) {
	if (!m_videoRenderer)
	m_videoRenderer.reset(new media::SkCanvasVideoRenderer);
	VideoLayerImpl::FramePlane& plane = m_framePlanes[media::VideoFrame::kRGBPlane];
	ResourceProvider::ScopedWriteLockSoftware lock(resourceProvider, plane.resourceId);
	m_videoRenderer->Paint(m_frame, lock.skCanvas(), gfx::Rect(plane.size), 0xFF);
	return true;
	}

	for (size_t planeIndex = 0; planeIndex < planeCount; ++planeIndex) {
	VideoLayerImpl::FramePlane& plane = m_framePlanes[planeIndex];
	const uint8_t* softwarePlanePixels = m_frame->data(planeIndex);
	gfx::Rect planeRect(gfx::Point(), plane.size);
	resourceProvider->setPixels(plane.resourceId, softwarePlanePixels, planeRect, planeRect, gfx::Vector2d());
	}
	return true;
	}

	void VideoLayerImpl::freePlaneData(ResourceProvider* resourceProvider)
	{
	for (size_t i = 0; i < media::VideoFrame::kMaxPlanes; ++i)
	m_framePlanes[i].freeData(resourceProvider);
	}

	void VideoLayerImpl::freeUnusedPlaneData(ResourceProvider* resourceProvider)
	{
	size_t firstUnusedPlane = numPlanes();
	for (size_t i = firstUnusedPlane; i < media::VideoFrame::kMaxPlanes; ++i)
	m_framePlanes[i].freeData(resourceProvider);
	}

	void VideoLayerImpl::didReceiveFrame()
	{
	setNeedsRedraw();
	}

	void VideoLayerImpl::didUpdateMatrix(const float matrix[16])
	{
	m_streamTextureMatrix = WebKit::WebTransformationMatrix(
	matrix[0], matrix[1], matrix[2], matrix[3],
	matrix[4], matrix[5], matrix[6], matrix[7],
	matrix[8], matrix[9], matrix[10], matrix[11],
	matrix[12], matrix[13], matrix[14], matrix[15]);
	setNeedsRedraw();
	}

	void VideoLayerImpl::didLoseContext()
	{
	freePlaneData(layerTreeHostImpl()->resourceProvider());
	}

	void VideoLayerImpl::setNeedsRedraw()
	{
	layerTreeHostImpl()->setNeedsRedraw();
	}

	void VideoLayerImpl::dumpLayerProperties(std::string* str, int indent) const
	{
	str->append(indentString(indent));
	str->append("video layer\n");
	LayerImpl::dumpLayerProperties(str, indent);
	}

	const char* VideoLayerImpl::layerTypeAsString() const
	{
	return "VideoLayer";
	}

	}