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// Copyright (c) 2009 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_RENDERER_PAINT_AGGREGATOR_H_
#define CHROME_RENDERER_PAINT_AGGREGATOR_H_
#pragma once
#include <vector>
#include "gfx/rect.h"
// This class is responsible for aggregating multiple invalidation and scroll
// commands to produce a scroll and repaint sequence.
class PaintAggregator {
public:
// This structure describes an aggregation of InvalidateRect and ScrollRect
// calls. If |scroll_rect| is non-empty, then that rect should be scrolled
// by the amount specified by |scroll_delta|. If |paint_rects| is non-empty,
// then those rects should be repainted. If |scroll_rect| and |paint_rects|
// are non-empty, then scrolling should be performed before repainting.
// |scroll_delta| can only specify scrolling in one direction (i.e., the x
// and y members cannot both be non-zero).
struct PendingUpdate {
gfx::Point scroll_delta;
gfx::Rect scroll_rect;
std::vector<gfx::Rect> paint_rects;
// Returns the rect damaged by scrolling within |scroll_rect| by
// |scroll_delta|. This rect must be repainted.
gfx::Rect GetScrollDamage() const;
// Returns the smallest rect containing all paint rects.
gfx::Rect GetPaintBounds() const;
};
// There is a PendingUpdate if InvalidateRect or ScrollRect were called and
// ClearPendingUpdate was not called.
bool HasPendingUpdate() const;
void ClearPendingUpdate();
const PendingUpdate& GetPendingUpdate() const { return update_; }
// The given rect should be repainted.
void InvalidateRect(const gfx::Rect& rect);
// The given rect should be scrolled by the given amounts.
void ScrollRect(int dx, int dy, const gfx::Rect& clip_rect);
private:
gfx::Rect ScrollPaintRect(const gfx::Rect& paint_rect, int dx, int dy) const;
bool ShouldInvalidateScrollRect(const gfx::Rect& rect) const;
void InvalidateScrollRect();
void CombinePaintRects();
PendingUpdate update_;
};
#endif // CHROME_RENDERER_PAINT_AGGREGATOR_H_
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