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// 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 "config.h"
#include "CCLayerQuad.h"
#include "base/logging.h"
namespace cc {
LayerQuad::Edge::Edge(const FloatPoint& p, const FloatPoint& q)
{
DCHECK(p != q);
FloatPoint 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 FloatQuad& quad)
{
// Create edges.
m_left = Edge(quad.p4(), quad.p1());
m_right = Edge(quad.p2(), quad.p3());
m_top = Edge(quad.p1(), quad.p2());
m_bottom = Edge(quad.p3(), quad.p4());
float sign = quad.isCounterclockwise() ? -1 : 1;
m_left.scale(sign);
m_right.scale(sign);
m_top.scale(sign);
m_bottom.scale(sign);
}
LayerQuad::LayerQuad(const Edge& left, const Edge& top, const Edge& right, const Edge& bottom)
: m_left(left)
, m_top(top)
, m_right(right)
, m_bottom(bottom)
{
}
FloatQuad LayerQuad::floatQuad() const
{
return FloatQuad(m_left.intersect(m_top),
m_top.intersect(m_right),
m_right.intersect(m_bottom),
m_bottom.intersect(m_left));
}
void LayerQuad::toFloatArray(float flattened[12]) const
{
flattened[0] = m_left.x();
flattened[1] = m_left.y();
flattened[2] = m_left.z();
flattened[3] = m_top.x();
flattened[4] = m_top.y();
flattened[5] = m_top.z();
flattened[6] = m_right.x();
flattened[7] = m_right.y();
flattened[8] = m_right.z();
flattened[9] = m_bottom.x();
flattened[10] = m_bottom.y();
flattened[11] = m_bottom.z();
}
} // namespace cc
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