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// Copyright 2014 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.
#ifndef CONTENT_BROWSER_COMPOSITOR_SOFTWARE_OUTPUT_DEVICE_MAC_H_
#define CONTENT_BROWSER_COMPOSITOR_SOFTWARE_OUTPUT_DEVICE_MAC_H_
#include <IOSurface/IOSurface.h>
#include "base/mac/scoped_cftyperef.h"
#include "base/macros.h"
#include "cc/output/software_output_device.h"
#include "third_party/skia/include/core/SkRegion.h"
#include "ui/gfx/vsync_provider.h"
namespace gfx {
class Canvas;
}
namespace ui {
class Compositor;
}
namespace content {
class SoftwareOutputDeviceMac :
public cc::SoftwareOutputDevice,
public gfx::VSyncProvider {
public:
explicit SoftwareOutputDeviceMac(ui::Compositor* compositor);
~SoftwareOutputDeviceMac() override;
// cc::SoftwareOutputDevice implementation.
void Resize(const gfx::Size& pixel_size, float scale_factor) override;
SkCanvas* BeginPaint(const gfx::Rect& damage_rect) override;
void EndPaint() override;
void DiscardBackbuffer() override;
void EnsureBackbuffer() override;
gfx::VSyncProvider* GetVSyncProvider() override;
// gfx::VSyncProvider implementation.
void GetVSyncParameters(
const gfx::VSyncProvider::UpdateVSyncCallback& callback) override;
private:
bool EnsureBuffersExist();
// Copy the pixels from the previous buffer to the new buffer.
void CopyPreviousBufferDamage(const SkRegion& new_damage_rect);
ui::Compositor* compositor_;
gfx::Size pixel_size_;
float scale_factor_;
// This surface is double-buffered. The two buffers are in |io_surfaces_|,
// and the index of the current buffer is |current_buffer_|.
base::ScopedCFTypeRef<IOSurfaceRef> io_surfaces_[2];
int current_index_;
// The previous frame's damage rectangle. Used to copy unchanged content
// between buffers in CopyPreviousBufferDamage.
SkRegion previous_buffer_damage_region_;
// The SkCanvas wrapps the mapped current IOSurface. It is valid only between
// BeginPaint and EndPaint.
skia::RefPtr<SkCanvas> canvas_;
gfx::VSyncProvider::UpdateVSyncCallback update_vsync_callback_;
DISALLOW_COPY_AND_ASSIGN(SoftwareOutputDeviceMac);
};
} // namespace content
#endif // CONTENT_BROWSER_COMPOSITOR_SOFTWARE_OUTPUT_DEVICE_MAC_H_
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