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1 /* | 1 /* |
2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 */ | 29 */ |
30 | 30 |
31 #ifndef PaintAggregator_h | 31 #ifndef PaintAggregator_h |
32 #define PaintAggregator_h | 32 #define PaintAggregator_h |
33 | 33 |
34 #include "platform/geometry/IntPoint.h" | 34 #include "platform/geometry/IntPoint.h" |
35 #include "platform/geometry/IntRect.h" | 35 #include "platform/geometry/IntRect.h" |
36 #include "wtf/Allocator.h" | |
37 #include "wtf/Vector.h" | 36 #include "wtf/Vector.h" |
38 | 37 |
39 namespace blink { | 38 namespace blink { |
40 | 39 |
41 // This class is responsible for aggregating multiple invalidation and scroll | 40 // This class is responsible for aggregating multiple invalidation and scroll |
42 // commands to produce a scroll and repaint sequence. | 41 // commands to produce a scroll and repaint sequence. |
43 class PaintAggregator { | 42 class PaintAggregator { |
44 STACK_ALLOCATED(); | |
45 public: | 43 public: |
46 // This structure describes an aggregation of invalidateRect and scrollRect | 44 // This structure describes an aggregation of invalidateRect and scrollRect |
47 // calls. If |scrollRect| is non-empty, then that rect should be scrolled | 45 // calls. If |scrollRect| is non-empty, then that rect should be scrolled |
48 // by the amount specified by |scrollDelta|. If |paintRects| is non-empty, | 46 // by the amount specified by |scrollDelta|. If |paintRects| is non-empty, |
49 // then those rects should be repainted. If |scrollRect| and |paintRects| | 47 // then those rects should be repainted. If |scrollRect| and |paintRects| |
50 // are non-empty, then scrolling should be performed before repainting. | 48 // are non-empty, then scrolling should be performed before repainting. |
51 // |scrollDelta| can only specify scrolling in one direction (i.e., the x | 49 // |scrollDelta| can only specify scrolling in one direction (i.e., the x |
52 // and y members cannot both be non-zero). | 50 // and y members cannot both be non-zero). |
53 struct PendingUpdate { | 51 struct PendingUpdate { |
54 STACK_ALLOCATED(); | |
55 PendingUpdate(); | 52 PendingUpdate(); |
56 ~PendingUpdate(); | 53 ~PendingUpdate(); |
57 | 54 |
58 // Returns the rect damaged by scrolling within |scrollRect| by | 55 // Returns the rect damaged by scrolling within |scrollRect| by |
59 // |scrollDelta|. This rect must be repainted. | 56 // |scrollDelta|. This rect must be repainted. |
60 IntRect calculateScrollDamage() const; | 57 IntRect calculateScrollDamage() const; |
61 | 58 |
62 // Returns the smallest rect containing all paint rects. | 59 // Returns the smallest rect containing all paint rects. |
63 IntRect calculatePaintBounds() const; | 60 IntRect calculatePaintBounds() const; |
64 | 61 |
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86 bool shouldInvalidateScrollRect(const IntRect&) const; | 83 bool shouldInvalidateScrollRect(const IntRect&) const; |
87 void invalidateScrollRect(); | 84 void invalidateScrollRect(); |
88 void combinePaintRects(); | 85 void combinePaintRects(); |
89 | 86 |
90 PendingUpdate m_update; | 87 PendingUpdate m_update; |
91 }; | 88 }; |
92 | 89 |
93 } // namespace blink | 90 } // namespace blink |
94 | 91 |
95 #endif | 92 #endif |
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