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 #include "cc/resources/layer_quad.h" 6 7 #include "base/logging.h" 8 #include "ui/gfx/quad_f.h" 9 10 namespace cc { 11 12 LayerQuad::Edge::Edge(const gfx::PointF& p, const gfx::PointF& q) { 13 DCHECK(p != q); 14 15 gfx::Vector2dF tangent(p.y() - q.y(), q.x() - p.x()); 16 float cross2 = p.x() * q.y() - q.x() * p.y(); 17 18 set(tangent.x(), tangent.y(), cross2); 19 scale(1.0f / tangent.Length()); 20 } 21 22 LayerQuad::LayerQuad(const gfx::QuadF& quad) { 23 // Create edges. 24 left_ = Edge(quad.p4(), quad.p1()); 25 right_ = Edge(quad.p2(), quad.p3()); 26 top_ = Edge(quad.p1(), quad.p2()); 27 bottom_ = Edge(quad.p3(), quad.p4()); 28 29 float sign = quad.IsCounterClockwise() ? -1 : 1; 30 left_.scale(sign); 31 right_.scale(sign); 32 top_.scale(sign); 33 bottom_.scale(sign); 34 } 35 36 LayerQuad::LayerQuad(const Edge& left, 37 const Edge& top, 38 const Edge& right, 39 const Edge& bottom) 40 : left_(left), 41 top_(top), 42 right_(right), 43 bottom_(bottom) {} 44 45 gfx::QuadF LayerQuad::ToQuadF() const { 46 return gfx::QuadF(left_.Intersect(top_), 47 top_.Intersect(right_), 48 right_.Intersect(bottom_), 49 bottom_.Intersect(left_)); 50 } 51 52 void LayerQuad::ToFloatArray(float flattened[12]) const { 53 flattened[0] = left_.x(); 54 flattened[1] = left_.y(); 55 flattened[2] = left_.z(); 56 flattened[3] = top_.x(); 57 flattened[4] = top_.y(); 58 flattened[5] = top_.z(); 59 flattened[6] = right_.x(); 60 flattened[7] = right_.y(); 61 flattened[8] = right_.z(); 62 flattened[9] = bottom_.x(); 63 flattened[10] = bottom_.y(); 64 flattened[11] = bottom_.z(); 65 } 66 67 } // namespace cc 68
