| /* |
| * Copyright (C) 2011 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef PaintAggregator_h |
| #define PaintAggregator_h |
| |
| #include "platform/geometry/IntPoint.h" |
| #include "platform/geometry/IntRect.h" |
| #include "wtf/Vector.h" |
| |
| namespace blink { |
| |
| // 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 |scrollRect| is non-empty, then that rect should be scrolled |
| // by the amount specified by |scrollDelta|. If |paintRects| is non-empty, |
| // then those rects should be repainted. If |scrollRect| and |paintRects| |
| // are non-empty, then scrolling should be performed before repainting. |
| // |scrollDelta| can only specify scrolling in one direction (i.e., the x |
| // and y members cannot both be non-zero). |
| struct PendingUpdate { |
| PendingUpdate(); |
| ~PendingUpdate(); |
| |
| // Returns the rect damaged by scrolling within |scrollRect| by |
| // |scrollDelta|. This rect must be repainted. |
| WebCore::IntRect calculateScrollDamage() const; |
| |
| // Returns the smallest rect containing all paint rects. |
| WebCore::IntRect calculatePaintBounds() const; |
| |
| WebCore::IntPoint scrollDelta; |
| WebCore::IntRect scrollRect; |
| WTF::Vector<WebCore::IntRect> paintRects; |
| }; |
| |
| // There is a PendingUpdate if invalidateRect or scrollRect were called and |
| // ClearPendingUpdate was not called. |
| bool hasPendingUpdate() const; |
| void clearPendingUpdate(); |
| |
| // Fills |update| and clears the pending update. |
| void popPendingUpdate(PendingUpdate*); |
| |
| // The given rect should be repainted. |
| void invalidateRect(const WebCore::IntRect&); |
| |
| // The given rect should be scrolled by the given amounts. |
| void scrollRect(int dx, int dy, const WebCore::IntRect& clipRect); |
| |
| private: |
| WebCore::IntRect scrollPaintRect(const WebCore::IntRect& paintRect, int dx, int dy) const; |
| bool shouldInvalidateScrollRect(const WebCore::IntRect&) const; |
| void invalidateScrollRect(); |
| void combinePaintRects(); |
| |
| PendingUpdate m_update; |
| }; |
| |
| } // namespace blink |
| |
| #endif |