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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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