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// Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_
#define CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_
#pragma once
#include <vector>
#include "app/surface/transport_dib.h"
#include "base/basictypes.h"
#include "gfx/size.h"
class RenderProcessHost;
class RenderWidgetHost;
namespace gfx {
class Rect;
}
namespace skia {
class PlatformCanvas;
}
// Represents a backing store for the pixels in a RenderWidgetHost.
class BackingStore {
public:
virtual ~BackingStore();
RenderWidgetHost* render_widget_host() const { return render_widget_host_; }
const gfx::Size& size() { return size_; }
// The number of bytes that this backing store consumes. The default
// implementation just assumes there's 32 bits per pixel over the current
// size of the screen. Implementations may override this if they have more
// information about the color depth.
virtual size_t MemorySize();
// Paints the bitmap from the renderer onto the backing store. bitmap_rect
// gives the location of bitmap, and copy_rects specifies the subregion(s) of
// the backingstore to be painted from the bitmap.
//
// The value placed into |*painted_synchronously| indicates if the paint was
// completed synchronously and the TransportDIB can be freed. False means that
// the backing store may still be using the transport DIB and it will manage
// notifying the RenderWidgetHost that it's done with it via
// DonePaintingToBackingStore().
virtual void PaintToBackingStore(
RenderProcessHost* process,
TransportDIB::Id bitmap,
const gfx::Rect& bitmap_rect,
const std::vector<gfx::Rect>& copy_rects,
bool* painted_synchronously) = 0;
// Extracts the gives subset of the backing store and copies it to the given
// PlatformCanvas. The PlatformCanvas should not be initialized. This function
// will call initialize() with the correct size. The return value indicates
// success.
virtual bool CopyFromBackingStore(const gfx::Rect& rect,
skia::PlatformCanvas* output) = 0;
// Scrolls the contents of clip_rect in the backing store by dx or dy (but dx
// and dy cannot both be non-zero).
virtual void ScrollBackingStore(int dx, int dy,
const gfx::Rect& clip_rect,
const gfx::Size& view_size) = 0;
protected:
// Can only be constructed via subclasses.
BackingStore(RenderWidgetHost* widget, const gfx::Size& size);
private:
// The owner of this backing store.
RenderWidgetHost* render_widget_host_;
// The size of the backing store.
gfx::Size size_;
DISALLOW_COPY_AND_ASSIGN(BackingStore);
};
#endif // CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_
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