| // Copyright 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/resources/layer_quad.h" |
| |
| #include "base/logging.h" |
| #include "ui/gfx/quad_f.h" |
| |
| namespace cc { |
| |
| LayerQuad::Edge::Edge(const gfx::PointF& p, const gfx::PointF& q) { |
| DCHECK(p != q); |
| |
| gfx::Vector2dF tangent(p.y() - q.y(), q.x() - p.x()); |
| float cross2 = p.x() * q.y() - q.x() * p.y(); |
| |
| set(tangent.x(), tangent.y(), cross2); |
| scale(1.0f / tangent.Length()); |
| } |
| |
| LayerQuad::LayerQuad(const gfx::QuadF& quad) { |
| // Create edges. |
| left_ = Edge(quad.p4(), quad.p1()); |
| right_ = Edge(quad.p2(), quad.p3()); |
| top_ = Edge(quad.p1(), quad.p2()); |
| bottom_ = Edge(quad.p3(), quad.p4()); |
| |
| float sign = quad.IsCounterClockwise() ? -1 : 1; |
| left_.scale(sign); |
| right_.scale(sign); |
| top_.scale(sign); |
| bottom_.scale(sign); |
| } |
| |
| LayerQuad::LayerQuad(const Edge& left, |
| const Edge& top, |
| const Edge& right, |
| const Edge& bottom) |
| : left_(left), |
| top_(top), |
| right_(right), |
| bottom_(bottom) {} |
| |
| gfx::QuadF LayerQuad::ToQuadF() const { |
| return gfx::QuadF(left_.Intersect(top_), |
| top_.Intersect(right_), |
| right_.Intersect(bottom_), |
| bottom_.Intersect(left_)); |
| } |
| |
| void LayerQuad::ToFloatArray(float flattened[12]) const { |
| flattened[0] = left_.x(); |
| flattened[1] = left_.y(); |
| flattened[2] = left_.z(); |
| flattened[3] = top_.x(); |
| flattened[4] = top_.y(); |
| flattened[5] = top_.z(); |
| flattened[6] = right_.x(); |
| flattened[7] = right_.y(); |
| flattened[8] = right_.z(); |
| flattened[9] = bottom_.x(); |
| flattened[10] = bottom_.y(); |
| flattened[11] = bottom_.z(); |
| } |
| |
| } // namespace cc |