bool ImageBuffer::copyToPlatformTexture(WebGraphicsContext3D* context, Platform3DObject texture, GLenum internalFormat, GLenum destType, GLint level, bool premultiplyAlpha, bool flipY)
{
if (!Extensions3DUtil::canUseCopyTextureCHROMIUM(GL_TEXTURE_2D, internalFormat, destType, level))
return false;
if (!isSurfaceValid())
return false;
RefPtr<const SkImage> textureImage = m_surface->newImageSnapshot(PreferAcceleration);
if (!textureImage)
return false;
if (!m_surface->isAccelerated())
return false;
ASSERT(textureImage->isTextureBacked()); // isAccelerated() check above should guarantee this
// Get the texture ID, flushing pending operations if needed.
Platform3DObject textureId = textureImage->getTextureHandle(true);
if (!textureId)
return false;
OwnPtr<WebGraphicsContext3DProvider> provider = adoptPtr(Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
if (!provider)
return false;
WebGraphicsContext3D* sharedContext = provider->context3d();
if (!sharedContext)
return false;
OwnPtr<WebExternalTextureMailbox> mailbox = adoptPtr(new WebExternalTextureMailbox);
// Contexts may be in a different share group. We must transfer the texture through a mailbox first
sharedContext->genMailboxCHROMIUM(mailbox->name);
sharedContext->produceTextureDirectCHROMIUM(textureId, GL_TEXTURE_2D, mailbox->name);
sharedContext->flush();
mailbox->validSyncToken = sharedContext->insertSyncPoint(mailbox->syncToken);
if (mailbox->validSyncToken)
context->waitSyncToken(mailbox->syncToken);
Platform3DObject sourceTexture = context->createAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox->name);
// The canvas is stored in a premultiplied format, so unpremultiply if necessary.
// The canvas is stored in an inverted position, so the flip semantics are reversed.
context->copyTextureCHROMIUM(GL_TEXTURE_2D, sourceTexture, texture, internalFormat, destType, flipY ? GL_FALSE : GL_TRUE, GL_FALSE, premultiplyAlpha ? GL_FALSE : GL_TRUE);
context->deleteTexture(sourceTexture);
context->flush();
WGC3Dbyte syncToken[24];
if (context->insertSyncPoint(syncToken))
sharedContext->waitSyncToken(syncToken);
// Undo grContext texture binding changes introduced in this function
provider->grContext()->resetContext(kTextureBinding_GrGLBackendState);
return true;
}
bool ImageBuffer::copyToPlatformTexture(WebGraphicsContext3D* context, Platform3DObject texture, GLenum internalFormat, GLenum destType, GLint level, bool premultiplyAlpha, bool flipY)
{
if (!m_surface->isAccelerated() || !getBackingTexture() || !isSurfaceValid())
return false;
if (!Extensions3DUtil::canUseCopyTextureCHROMIUM(internalFormat, destType, level))
return false;
OwnPtr<WebGraphicsContext3DProvider> provider = adoptPtr(Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
if (!provider)
return false;
WebGraphicsContext3D* sharedContext = provider->context3d();
if (!sharedContext)
return false;
OwnPtr<WebExternalTextureMailbox> mailbox = adoptPtr(new WebExternalTextureMailbox);
// Contexts may be in a different share group. We must transfer the texture through a mailbox first
sharedContext->genMailboxCHROMIUM(mailbox->name);
sharedContext->produceTextureDirectCHROMIUM(getBackingTexture(), GL_TEXTURE_2D, mailbox->name);
sharedContext->flush();
mailbox->syncPoint = sharedContext->insertSyncPoint();
context->waitSyncPoint(mailbox->syncPoint);
Platform3DObject sourceTexture = context->createAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox->name);
// The canvas is stored in a premultiplied format, so unpremultiply if necessary.
context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, !premultiplyAlpha);
// The canvas is stored in an inverted position, so the flip semantics are reversed.
context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, !flipY);
context->copyTextureCHROMIUM(GL_TEXTURE_2D, sourceTexture, texture, level, internalFormat, destType);
context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, false);
context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
context->deleteTexture(sourceTexture);
context->flush();
sharedContext->waitSyncPoint(context->insertSyncPoint());
// Undo grContext texture binding changes introduced in this function
provider->grContext()->resetContext(kTextureBinding_GrGLBackendState);
return true;
}
bool Canvas2DLayerBridge::prepareMailbox(WebExternalTextureMailbox* outMailbox, WebExternalBitmap* bitmap)
{
if (m_destructionInProgress) {
// It can be hit in the following sequence.
// 1. Canvas draws something.
// 2. The compositor begins the frame.
// 3. Javascript makes a context be lost.
// 4. Here.
return false;
}
if (bitmap) {
// Using accelerated 2d canvas with software renderer, which
// should only happen in tests that use fake graphics contexts
// or in Android WebView in software mode. In this case, we do
// not care about producing any results for this canvas.
m_canvas->silentFlush();
m_lastImageId = 0;
return false;
}
if (!checkSurfaceValid())
return false;
WebGraphicsContext3D* webContext = context();
// Release to skia textures that were previouosly released by the
// compositor. We do this before acquiring the next snapshot in
// order to cap maximum gpu memory consumption.
flush();
RefPtr<SkImage> image = adoptRef(m_canvas->newImageSnapshot());
// Early exit if canvas was not drawn to since last prepareMailbox
GLenum filter = m_filterLevel == SkPaint::kNone_FilterLevel ? GL_NEAREST : GL_LINEAR;
if (image->uniqueID() == m_lastImageId && filter == m_lastFilter)
return false;
m_lastImageId = image->uniqueID();
m_lastFilter = filter;
{
MailboxInfo tmp;
tmp.m_image = image;
tmp.m_parentLayerBridge = this;
m_mailboxes.prepend(tmp);
}
MailboxInfo& mailboxInfo = m_mailboxes.first();
mailboxInfo.m_mailbox.nearestNeighbor = filter == GL_NEAREST;
GrContext* grContext = m_contextProvider->grContext();
if (!grContext)
return true; // for testing: skip gl stuff when using a mock graphics context.
ASSERT(image->getTexture());
// Because of texture sharing with the compositor, we must invalidate
// the state cached in skia so that the deferred copy on write
// in SkSurface_Gpu does not make any false assumptions.
mailboxInfo.m_image->getTexture()->textureParamsModified();
webContext->bindTexture(GL_TEXTURE_2D, mailboxInfo.m_image->getTexture()->getTextureHandle());
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Re-use the texture's existing mailbox, if there is one.
if (image->getTexture()->getCustomData()) {
ASSERT(image->getTexture()->getCustomData()->size() == sizeof(mailboxInfo.m_mailbox.name));
memcpy(&mailboxInfo.m_mailbox.name[0], image->getTexture()->getCustomData()->data(), sizeof(mailboxInfo.m_mailbox.name));
} else {
context()->genMailboxCHROMIUM(mailboxInfo.m_mailbox.name);
RefPtr<SkData> mialboxNameData = adoptRef(SkData::NewWithCopy(&mailboxInfo.m_mailbox.name[0], sizeof(mailboxInfo.m_mailbox.name)));
image->getTexture()->setCustomData(mialboxNameData.get());
webContext->produceTextureCHROMIUM(GL_TEXTURE_2D, mailboxInfo.m_mailbox.name);
}
if (isHidden()) {
// With hidden canvases, we release the SkImage immediately because
// there is no need for animations to be double buffered.
mailboxInfo.m_image.clear();
} else {
webContext->flush();
mailboxInfo.m_mailbox.syncPoint = webContext->insertSyncPoint();
}
webContext->bindTexture(GL_TEXTURE_2D, 0);
// Because we are changing the texture binding without going through skia,
// we must dirty the context.
grContext->resetContext(kTextureBinding_GrGLBackendState);
*outMailbox = mailboxInfo.m_mailbox;
return true;
}