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// Copyright (c) 2012 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 "remoting/client/rectangle_update_decoder.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop_proxy.h"
#include "ppapi/cpp/image_data.h"
#include "remoting/base/decoder.h"
#include "remoting/base/decoder_row_based.h"
#include "remoting/base/decoder_vp8.h"
#include "remoting/base/util.h"
#include "remoting/client/frame_consumer.h"
#include "remoting/protocol/session_config.h"
using base::Passed;
using remoting::protocol::ChannelConfig;
using remoting::protocol::SessionConfig;
namespace remoting {
RectangleUpdateDecoder::RectangleUpdateDecoder(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
scoped_refptr<FrameConsumerProxy> consumer)
: task_runner_(task_runner),
consumer_(consumer),
source_size_(SkISize::Make(0, 0)),
view_size_(SkISize::Make(0, 0)),
clip_area_(SkIRect::MakeEmpty()),
paint_scheduled_(false) {
}
RectangleUpdateDecoder::~RectangleUpdateDecoder() {
}
void RectangleUpdateDecoder::Initialize(const SessionConfig& config) {
// Initialize decoder based on the selected codec.
ChannelConfig::Codec codec = config.video_config().codec;
if (codec == ChannelConfig::CODEC_VERBATIM) {
decoder_.reset(DecoderRowBased::CreateVerbatimDecoder());
} else if (codec == ChannelConfig::CODEC_ZIP) {
decoder_.reset(DecoderRowBased::CreateZlibDecoder());
} else if (codec == ChannelConfig::CODEC_VP8) {
decoder_.reset(new DecoderVp8());
} else {
NOTREACHED() << "Invalid Encoding found: " << codec;
}
}
void RectangleUpdateDecoder::DecodePacket(scoped_ptr<VideoPacket> packet,
const base::Closure& done) {
if (!task_runner_->BelongsToCurrentThread()) {
task_runner_->PostTask(
FROM_HERE, base::Bind(&RectangleUpdateDecoder::DecodePacket,
this, base::Passed(&packet), done));
return;
}
base::ScopedClosureRunner done_runner(done);
bool decoder_needs_reset = false;
// If the packet includes a screen size, store it.
if (packet->format().has_screen_width() &&
packet->format().has_screen_height()) {
SkISize source_size = SkISize::Make(packet->format().screen_width(),
packet->format().screen_height());
if (source_size_ != source_size) {
source_size_ = source_size;
decoder_needs_reset = true;
}
}
// If we've never seen a screen size, ignore the packet.
if (source_size_.isZero()) {
return;
}
if (decoder_needs_reset) {
decoder_->Initialize(source_size_);
consumer_->SetSourceSize(source_size_);
}
if (!decoder_->IsReadyForData()) {
// TODO(ajwong): This whole thing should move into an invalid state.
LOG(ERROR) << "Decoder is unable to process data. Dropping packet.";
return;
}
if (decoder_->DecodePacket(packet.get()) == Decoder::DECODE_DONE)
SchedulePaint();
}
void RectangleUpdateDecoder::SchedulePaint() {
if (paint_scheduled_)
return;
paint_scheduled_ = true;
task_runner_->PostTask(
FROM_HERE, base::Bind(&RectangleUpdateDecoder::DoPaint, this));
}
void RectangleUpdateDecoder::DoPaint() {
DCHECK(paint_scheduled_);
paint_scheduled_ = false;
// If the view size is empty or we have no output buffers ready, return.
if (buffers_.empty() || view_size_.isEmpty())
return;
// If no Decoder is initialized, or the host dimensions are empty, return.
if (!decoder_.get() || source_size_.isEmpty())
return;
// Draw the invalidated region to the buffer.
pp::ImageData* buffer = buffers_.front();
SkRegion output_region;
decoder_->RenderFrame(view_size_, clip_area_,
reinterpret_cast<uint8*>(buffer->data()),
buffer->stride(),
&output_region);
// Notify the consumer that painting is done.
if (!output_region.isEmpty()) {
buffers_.pop_front();
consumer_->ApplyBuffer(view_size_, clip_area_, buffer, output_region);
}
}
void RectangleUpdateDecoder::RequestReturnBuffers(const base::Closure& done) {
if (!task_runner_->BelongsToCurrentThread()) {
task_runner_->PostTask(
FROM_HERE, base::Bind(&RectangleUpdateDecoder::RequestReturnBuffers,
this, done));
return;
}
while (!buffers_.empty()) {
consumer_->ReturnBuffer(buffers_.front());
buffers_.pop_front();
}
if (!done.is_null())
done.Run();
}
void RectangleUpdateDecoder::DrawBuffer(pp::ImageData* buffer) {
if (!task_runner_->BelongsToCurrentThread()) {
task_runner_->PostTask(
FROM_HERE, base::Bind(&RectangleUpdateDecoder::DrawBuffer,
this, buffer));
return;
}
DCHECK(clip_area_.width() <= buffer->size().width() &&
clip_area_.height() <= buffer->size().height());
buffers_.push_back(buffer);
SchedulePaint();
}
void RectangleUpdateDecoder::InvalidateRegion(const SkRegion& region) {
if (!task_runner_->BelongsToCurrentThread()) {
task_runner_->PostTask(
FROM_HERE, base::Bind(&RectangleUpdateDecoder::InvalidateRegion,
this, region));
return;
}
if (decoder_.get()) {
decoder_->Invalidate(view_size_, region);
SchedulePaint();
}
}
void RectangleUpdateDecoder::SetOutputSizeAndClip(const SkISize& view_size,
const SkIRect& clip_area) {
if (!task_runner_->BelongsToCurrentThread()) {
task_runner_->PostTask(
FROM_HERE, base::Bind(&RectangleUpdateDecoder::SetOutputSizeAndClip,
this, view_size, clip_area));
return;
}
// The whole frame needs to be repainted if the scaling factor has changed.
if (view_size_ != view_size && decoder_.get()) {
SkRegion region;
region.op(SkIRect::MakeSize(view_size), SkRegion::kUnion_Op);
decoder_->Invalidate(view_size, region);
}
if (view_size_ != view_size ||
clip_area_ != clip_area) {
view_size_ = view_size;
clip_area_ = clip_area;
// Return buffers that are smaller than needed to the consumer for
// reuse/reallocation.
std::list<pp::ImageData*>::iterator i = buffers_.begin();
while (i != buffers_.end()) {
pp::Size buffer_size = (*i)->size();
if (buffer_size.width() < clip_area_.width() ||
buffer_size.height() < clip_area_.height()) {
consumer_->ReturnBuffer(*i);
i = buffers_.erase(i);
} else {
++i;
}
}
SchedulePaint();
}
}
} // namespace remoting
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