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// Copyright (c) 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 "content/renderer/browser_plugin/browser_plugin_compositing_helper.h"
#include "cc/solid_color_layer.h"
#include "cc/texture_layer.h"
#include "content/common/browser_plugin_messages.h"
#include "content/renderer/browser_plugin/browser_plugin_manager.h"
#include "content/renderer/render_thread_impl.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebSharedGraphicsContext3D.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
#include "webkit/compositor_bindings/web_layer_impl.h"
namespace content {
BrowserPluginCompositingHelper::BrowserPluginCompositingHelper(
WebKit::WebPluginContainer* container,
BrowserPluginManager* manager,
int instance_id,
int host_routing_id)
: instance_id_(instance_id),
host_routing_id_(host_routing_id),
last_gpu_route_id_(0),
last_gpu_host_id_(0),
last_mailbox_valid_(false),
ack_pending_(true),
ack_pending_for_crashed_guest_(false),
container_(container),
browser_plugin_manager_(manager) {
}
BrowserPluginCompositingHelper::~BrowserPluginCompositingHelper() {
}
void BrowserPluginCompositingHelper::EnableCompositing(bool enable) {
if (enable && !texture_layer_) {
texture_layer_ = cc::TextureLayer::createForMailbox();
texture_layer_->setIsDrawable(true);
texture_layer_->setContentsOpaque(true);
background_layer_ = cc::SolidColorLayer::create();
background_layer_->setMasksToBounds(true);
background_layer_->setBackgroundColor(
SkColorSetARGBInline(255, 255, 255, 255));
background_layer_->addChild(texture_layer_);
web_layer_.reset(new WebKit::WebLayerImpl(background_layer_));
}
container_->setWebLayer(enable ? web_layer_.get() : NULL);
}
// If we have a mailbox that was freed up from the compositor,
// but we are not expected to return it to the guest renderer
// via an ACK, we should free it because we now own it.
// To free the mailbox memory, we need a context to consume it
// into a texture ID and then delete this texture ID.
// We use a shared graphics context accessible from the main
// thread to do it.
void BrowserPluginCompositingHelper::FreeMailboxMemory(
const std::string& mailbox_name,
unsigned sync_point) {
if (mailbox_name.empty())
return;
WebKit::WebGraphicsContext3D *context =
WebKit::WebSharedGraphicsContext3D::mainThreadContext();
DCHECK(context);
// When a buffer is released from the compositor, we also get a
// sync point that specifies when in the command buffer
// it's safe to use it again.
// If the sync point is non-zero, we need to tell our context
// to wait until this sync point is reached before we can safely
// delete the buffer.
if (sync_point)
context->waitSyncPoint(sync_point);
unsigned texture_id = context->createTexture();
context->bindTexture(GL_TEXTURE_2D, texture_id);
context->consumeTextureCHROMIUM(
GL_TEXTURE_2D,
reinterpret_cast<const int8*>(mailbox_name.data()));
context->deleteTexture(texture_id);
}
void BrowserPluginCompositingHelper::MailboxReleased(
const std::string& mailbox_name,
int gpu_route_id,
int gpu_host_id,
unsigned sync_point) {
// This means the GPU process crashed and we have nothing further to do.
// Nobody is expecting an ACK and the buffer doesn't need to be deleted
// because it went away with the GPU process.
if (last_gpu_host_id_ != gpu_host_id)
return;
// This means the guest crashed.
// Either ACK the last buffer, so texture transport could
// be destroyed of delete the mailbox if nobody wants it back.
if (last_gpu_route_id_ != gpu_route_id) {
if (!ack_pending_for_crashed_guest_) {
FreeMailboxMemory(mailbox_name, sync_point);
} else {
ack_pending_for_crashed_guest_ = false;
browser_plugin_manager_->Send(
new BrowserPluginHostMsg_BuffersSwappedACK(
host_routing_id_,
instance_id_,
gpu_route_id,
gpu_host_id,
mailbox_name,
sync_point));
}
return;
}
// We need to send an ACK to TextureImageTransportSurface
// for every buffer it sends us. However, if a buffer is freed up from
// the compositor in cases like switching back to SW mode without a new
// buffer arriving, no ACK is needed and we destroy this buffer.
if (!ack_pending_) {
FreeMailboxMemory(mailbox_name, sync_point);
last_mailbox_valid_ = false;
return;
}
ack_pending_ = false;
browser_plugin_manager_->Send(
new BrowserPluginHostMsg_BuffersSwappedACK(
host_routing_id_,
instance_id_,
gpu_route_id,
gpu_host_id,
mailbox_name,
sync_point));
}
void BrowserPluginCompositingHelper::OnContainerDestroy() {
if (container_)
container_->setWebLayer(NULL);
container_ = NULL;
texture_layer_ = NULL;
background_layer_ = NULL;
web_layer_.reset();
}
void BrowserPluginCompositingHelper::OnBuffersSwapped(
const gfx::Size& size,
const std::string& mailbox_name,
int gpu_route_id,
int gpu_host_id) {
// If the guest crashed but the GPU process didn't, we may still have
// a transport surface waiting on an ACK, which we must send to
// avoid leaking.
if (last_gpu_route_id_ != gpu_route_id && last_gpu_host_id_ == gpu_host_id)
ack_pending_for_crashed_guest_ = ack_pending_;
// If these mismatch, we are either just starting up, GPU process crashed or
// guest renderer crashed.
// In this case, we are communicating with a new image transport
// surface and must ACK with the new ID's and an empty mailbox.
if (last_gpu_route_id_ != gpu_route_id || last_gpu_host_id_ != gpu_host_id)
last_mailbox_valid_ = false;
last_gpu_route_id_ = gpu_route_id;
last_gpu_host_id_ = gpu_host_id;
ack_pending_ = true;
// Browser plugin getting destroyed, do a fast ACK.
if (!texture_layer_) {
MailboxReleased(mailbox_name, gpu_route_id, gpu_host_id, 0);
return;
}
// The size of browser plugin container is not always equal to the size
// of the buffer that arrives here. This could be for a number of reasons,
// including autosize and a resize in progress.
// During resize, the container size changes first and then some time
// later, a new buffer with updated size will arrive. During this process,
// we need to make sure that things are still displayed pixel perfect.
// We accomplish this by modifying bounds of the texture layer only
// when a new buffer arrives.
// Visually, this will either display a smaller part of the buffer
// or introduce a gutter around it.
if (buffer_size_ != size) {
buffer_size_ = size;
texture_layer_->setBounds(buffer_size_);
}
bool current_mailbox_valid = !mailbox_name.empty();
if (!last_mailbox_valid_) {
MailboxReleased(std::string(), gpu_route_id, gpu_host_id, 0);
if (!current_mailbox_valid)
return;
}
cc::TextureMailbox::ReleaseCallback callback;
if (current_mailbox_valid) {
callback = base::Bind(&BrowserPluginCompositingHelper::MailboxReleased,
scoped_refptr<BrowserPluginCompositingHelper>(this),
mailbox_name,
gpu_route_id,
gpu_host_id);
}
texture_layer_->setTextureMailbox(cc::TextureMailbox(mailbox_name,
callback));
last_mailbox_valid_ = current_mailbox_valid;
}
} // namespace content
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