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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/gpu/compositor_software_output_device.h"
#include "base/logging.h"
#include "cc/output/software_frame_data.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkDevice.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#include "ui/gfx/skia_util.h"
namespace content {
namespace {
class CompareById {
public:
CompareById(const TransportDIB::Id& id)
: id_(id) {
}
bool operator()(const TransportDIB* dib) const {
return dib->id() == id_;
}
private:
TransportDIB::Id id_;
};
} // namespace
CompositorSoftwareOutputDevice::CompositorSoftwareOutputDevice()
: front_buffer_(-1),
num_free_buffers_(0),
sequence_num_(0) {
DetachFromThread();
}
CompositorSoftwareOutputDevice::~CompositorSoftwareOutputDevice() {
DCHECK(CalledOnValidThread());
}
TransportDIB* CompositorSoftwareOutputDevice::CreateDIB() {
const size_t size = 4 * viewport_size_.GetArea();
TransportDIB* dib = TransportDIB::Create(size, sequence_num_++);
CHECK(dib);
bool success = dib->Map();
CHECK(success);
return dib;
}
void CompositorSoftwareOutputDevice::Resize(gfx::Size viewport_size) {
DCHECK(CalledOnValidThread());
if (viewport_size_ == viewport_size)
return;
// Keep non-ACKed dibs open.
int first_non_free = front_buffer_ + num_free_buffers_ + 1;
int num_non_free = dibs_.size() - num_free_buffers_;
for (int i = 0; i < num_non_free; ++i) {
int index = (first_non_free + i) % dibs_.size();
awaiting_ack_.push_back(dibs_[index]);
dibs_[index] = NULL;
}
dibs_.clear();
front_buffer_ = -1;
num_free_buffers_ = 0;
viewport_size_ = viewport_size;
}
SkCanvas* CompositorSoftwareOutputDevice::BeginPaint(gfx::Rect damage_rect) {
DCHECK(CalledOnValidThread());
gfx::Rect last_damage_rect = damage_rect_;
damage_rect_ = damage_rect;
int last_buffer = front_buffer_;
if (num_free_buffers_ == 0) {
dibs_.insert(dibs_.begin() + (front_buffer_ + 1), CreateDIB());
last_damage_rect = gfx::Rect(viewport_size_);
} else {
--num_free_buffers_;
}
front_buffer_ = (front_buffer_ + 1) % dibs_.size();
TransportDIB* front_dib = dibs_[front_buffer_];
DCHECK(front_dib);
DCHECK(front_dib->memory());
// Set up a canvas for the current front buffer.
bitmap_.setConfig(SkBitmap::kARGB_8888_Config,
viewport_size_.width(),
viewport_size_.height());
bitmap_.setPixels(front_dib->memory());
device_ = skia::AdoptRef(new SkDevice(bitmap_));
canvas_ = skia::AdoptRef(new SkCanvas(device_.get()));
// Copy over previous damage.
if (last_buffer != -1) {
TransportDIB* last_dib = dibs_[last_buffer];
SkBitmap back_bitmap;
back_bitmap.setConfig(SkBitmap::kARGB_8888_Config,
viewport_size_.width(),
viewport_size_.height());
back_bitmap.setPixels(last_dib->memory());
SkRegion region(RectToSkIRect(last_damage_rect));
region.op(RectToSkIRect(damage_rect), SkRegion::kDifference_Op);
for (SkRegion::Iterator it(region); !it.done(); it.next()) {
const SkIRect& src_rect = it.rect();
SkRect dst_rect = SkRect::Make(src_rect);
canvas_->drawBitmapRect(back_bitmap, &src_rect, dst_rect, NULL);
}
}
return canvas_.get();
}
void CompositorSoftwareOutputDevice::EndPaint(
cc::SoftwareFrameData* frame_data) {
DCHECK(CalledOnValidThread());
if (frame_data) {
frame_data->size = viewport_size_;
frame_data->damage_rect = damage_rect_;
frame_data->dib_id = dibs_[front_buffer_]->id();
}
}
void CompositorSoftwareOutputDevice::ReclaimDIB(const TransportDIB::Id& id) {
DCHECK(CalledOnValidThread());
if (!TransportDIB::is_valid_id(id))
return;
// The reclaimed dib id might not be among the currently
// active dibs if we got a resize event in the mean time.
ScopedVector<TransportDIB>::iterator it =
std::find_if(dibs_.begin(), dibs_.end(), CompareById(id));
if (it != dibs_.end()) {
++num_free_buffers_;
DCHECK_LE(static_cast<size_t>(num_free_buffers_), dibs_.size());
return;
} else {
it = std::find_if(awaiting_ack_.begin(), awaiting_ack_.end(),
CompareById(id));
DCHECK(it != awaiting_ack_.end());
awaiting_ack_.erase(it);
}
}
} // namespace content
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