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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.
#ifndef CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MAC_H_
#define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MAC_H_
#include "base/basictypes.h"
#include "base/mac/scoped_cftyperef.h"
#include "content/browser/renderer_host/backing_store.h"
namespace content {
class BackingStoreMac : public BackingStore {
public:
// |size| is in view units, |device_scale_factor| is the backingScaleFactor.
// The pixel size of the backing store is size.Scale(device_scale_factor).
BackingStoreMac(RenderWidgetHost* widget,
const gfx::Size& size,
float device_scale_factor);
virtual ~BackingStoreMac();
// A CGLayer that stores the contents of the backing store, cached in GPU
// memory if possible.
CGLayerRef cg_layer() { return cg_layer_; }
// A CGBitmapContext that stores the contents of the backing store if the
// corresponding Cocoa view has not been inserted into an NSWindow yet.
CGContextRef cg_bitmap() { return cg_bitmap_; }
// Called when the view's backing scale factor changes.
void ScaleFactorChanged(float device_scale_factor);
// BackingStore implementation.
virtual size_t MemorySize() OVERRIDE;
virtual void PaintToBackingStore(
RenderProcessHost* process,
TransportDIB::Id bitmap,
const gfx::Rect& bitmap_rect,
const std::vector<gfx::Rect>& copy_rects,
float scale_factor,
const base::Closure& completion_callback,
bool* scheduled_completion_callback) OVERRIDE;
virtual bool CopyFromBackingStore(const gfx::Rect& rect,
skia::PlatformBitmap* output) OVERRIDE;
virtual void ScrollBackingStore(const gfx::Vector2d& delta,
const gfx::Rect& clip_rect,
const gfx::Size& view_size) OVERRIDE;
void CopyFromBackingStoreToCGContext(const CGRect& dest_rect,
CGContextRef context);
private:
// Creates a CGLayer associated with its owner view's window's graphics
// context, sized properly for the backing store. Returns NULL if the owner
// is not in a window with a CGContext. cg_layer_ is assigned this method's
// result.
CGLayerRef CreateCGLayer();
// Creates a CGBitmapContext sized properly for the backing store. The
// owner view need not be in a window. cg_bitmap_ is assigned this method's
// result.
CGContextRef CreateCGBitmapContext();
base::mac::ScopedCFTypeRef<CGContextRef> cg_bitmap_;
base::mac::ScopedCFTypeRef<CGLayerRef> cg_layer_;
// Number of physical pixels per view unit. This is 1 or 2 in practice.
float device_scale_factor_;
DISALLOW_COPY_AND_ASSIGN(BackingStoreMac);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MAC_H_
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