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.
5 #include "cc/resources/layer_quad.h"
7 #include "base/logging.h"
8 #include "ui/gfx/quad_f.h"
12 LayerQuad::Edge::Edge(const gfx::PointF
& p
, const gfx::PointF
& q
) {
15 gfx::Vector2dF
tangent(p
.y() - q
.y(), q
.x() - p
.x());
16 float cross2
= p
.x() * q
.y() - q
.x() * p
.y();
18 set(tangent
.x(), tangent
.y(), cross2
);
19 scale(1.0f
/ tangent
.Length());
22 LayerQuad::LayerQuad(const gfx::QuadF
& quad
) {
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());
29 float sign
= quad
.IsCounterClockwise() ? -1 : 1;
36 LayerQuad::LayerQuad(const Edge
& left
,
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_
));
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();