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1 // Copyright 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 | |
6 #include "config.h" | |
7 | |
8 #if USE(ACCELERATED_COMPOSITING) | |
9 | |
10 #include "CCLayerQuad.h" | |
11 | |
12 namespace cc { | |
13 | |
14 CCLayerQuad::Edge::Edge(const FloatPoint& p, const FloatPoint& q) | |
15 { | |
16 ASSERT(p != q); | |
17 | |
18 FloatPoint tangent(p.y() - q.y(), q.x() - p.x()); | |
19 float cross2 = p.x() * q.y() - q.x() * p.y(); | |
20 | |
21 set(tangent.x(), tangent.y(), cross2); | |
22 scale(1.0f / tangent.length()); | |
23 } | |
24 | |
25 CCLayerQuad::CCLayerQuad(const FloatQuad& quad) | |
26 { | |
27 // Create edges. | |
28 m_left = Edge(quad.p4(), quad.p1()); | |
29 m_right = Edge(quad.p2(), quad.p3()); | |
30 m_top = Edge(quad.p1(), quad.p2()); | |
31 m_bottom = Edge(quad.p3(), quad.p4()); | |
32 | |
33 float sign = quad.isCounterclockwise() ? -1 : 1; | |
34 m_left.scale(sign); | |
35 m_right.scale(sign); | |
36 m_top.scale(sign); | |
37 m_bottom.scale(sign); | |
38 } | |
39 | |
40 CCLayerQuad::CCLayerQuad(const Edge& left, const Edge& top, const Edge& right, c
onst Edge& bottom) | |
41 : m_left(left) | |
42 , m_top(top) | |
43 , m_right(right) | |
44 , m_bottom(bottom) | |
45 { | |
46 } | |
47 | |
48 FloatQuad CCLayerQuad::floatQuad() const | |
49 { | |
50 return FloatQuad(m_left.intersect(m_top), | |
51 m_top.intersect(m_right), | |
52 m_right.intersect(m_bottom), | |
53 m_bottom.intersect(m_left)); | |
54 } | |
55 | |
56 void CCLayerQuad::toFloatArray(float flattened[12]) const | |
57 { | |
58 flattened[0] = m_left.x(); | |
59 flattened[1] = m_left.y(); | |
60 flattened[2] = m_left.z(); | |
61 flattened[3] = m_top.x(); | |
62 flattened[4] = m_top.y(); | |
63 flattened[5] = m_top.z(); | |
64 flattened[6] = m_right.x(); | |
65 flattened[7] = m_right.y(); | |
66 flattened[8] = m_right.z(); | |
67 flattened[9] = m_bottom.x(); | |
68 flattened[10] = m_bottom.y(); | |
69 flattened[11] = m_bottom.z(); | |
70 } | |
71 | |
72 } // namespace cc | |
73 | |
74 #endif // USE(ACCELERATED_COMPOSITING) | |
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