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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_MANAGER_H_
#define CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_
#pragma once
#include <vector>
#include "app/surface/transport_dib.h"
#include "base/basictypes.h"
#include "base/process.h"
#include "gfx/rect.h"
#include "gfx/size.h"
class BackingStore;
class RenderWidgetHost;
// This class manages backing stores in the browsr. Every RenderWidgetHost is
// associated with a backing store which it requests from this class. The
// hosts don't maintain any references to the backing stores. These backing
// stores are maintained in a cache which can be trimmed as needed.
class BackingStoreManager {
public:
// Returns a backing store which matches the desired dimensions.
//
// backing_store_rect
// The desired backing store dimensions.
// Returns a pointer to the backing store on success, NULL on failure.
static BackingStore* GetBackingStore(RenderWidgetHost* host,
const gfx::Size& desired_size);
// Makes a backing store which is fully ready for consumption, i.e. the
// bitmap from the renderer has been copied into the backing store.
//
// backing_store_size
// The desired backing store dimensions.
// bitmap_section
// The bitmap section from the renderer.
// bitmap_rect
// The rect to be painted into the backing store
// needs_full_paint
// Set if we need to send out a request to paint the view
// to the renderer.
static void PrepareBackingStore(
RenderWidgetHost* host,
const gfx::Size& backing_store_size,
TransportDIB::Id bitmap,
const gfx::Rect& bitmap_rect,
const std::vector<gfx::Rect>& copy_rects,
bool* needs_full_paint);
// Returns a matching backing store for the host.
// Returns NULL if we fail to find one.
static BackingStore* Lookup(RenderWidgetHost* host);
// Removes the backing store for the host.
static void RemoveBackingStore(RenderWidgetHost* host);
// Removes all backing stores.
static void RemoveAllBackingStores();
// Expires the given backing store. This emulates something getting evicted
// from the cache for the purpose of testing. Returns true if the host was
// removed, false if it wasn't found.
static bool ExpireBackingStoreForTest(RenderWidgetHost* host);
// Current size in bytes of the backing store cache.
static size_t MemorySize();
private:
// Not intended for instantiation.
BackingStoreManager() {}
DISALLOW_COPY_AND_ASSIGN(BackingStoreManager);
};
#endif // CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_
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