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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.
#ifndef CC_LAYER_QUAD_H_
#define CC_LAYER_QUAD_H_
#include "cc/cc_export.h"
#include "ui/gfx/point_f.h"
namespace gfx {
class QuadF;
}
static const float kAntiAliasingInflateDistance = 0.5f;
namespace cc {
class CC_EXPORT LayerQuad {
public:
class Edge {
public:
Edge()
: m_x(0)
, m_y(0)
, m_z(0)
{
}
Edge(const gfx::PointF&, const gfx::PointF&);
float x() const { return m_x; }
float y() const { return m_y; }
float z() const { return m_z; }
void setX(float x) { m_x = x; }
void setY(float y) { m_y = y; }
void setZ(float z) { m_z = z; }
void set(float x, float y, float z)
{
m_x = x;
m_y = y;
m_z = z;
}
void moveX(float dx) { m_x += dx; }
void moveY(float dy) { m_y += dy; }
void moveZ(float dz) { m_z += dz; }
void move(float dx, float dy, float dz)
{
m_x += dx;
m_y += dy;
m_z += dz;
}
void scaleX(float sx) { m_x *= sx; }
void scaleY(float sy) { m_y *= sy; }
void scaleZ(float sz) { m_z *= sz; }
void scale(float sx, float sy, float sz)
{
m_x *= sx;
m_y *= sy;
m_z *= sz;
}
void scale(float s) { scale(s, s, s); }
gfx::PointF intersect(const Edge& e) const
{
return gfx::PointF(
(y() * e.z() - e.y() * z()) / (x() * e.y() - e.x() * y()),
(x() * e.z() - e.x() * z()) / (e.x() * y() - x() * e.y()));
}
private:
float m_x;
float m_y;
float m_z;
};
LayerQuad(const Edge& left, const Edge& top, const Edge& right, const Edge& bottom);
LayerQuad(const gfx::QuadF&);
Edge left() const { return m_left; }
Edge top() const { return m_top; }
Edge right() const { return m_right; }
Edge bottom() const { return m_bottom; }
void inflateX(float dx) { m_left.moveZ(dx); m_right.moveZ(dx); }
void inflateY(float dy) { m_top.moveZ(dy); m_bottom.moveZ(dy); }
void inflate(float d) { inflateX(d); inflateY(d); }
void inflateAntiAliasingDistance() { inflate(kAntiAliasingInflateDistance); }
gfx::QuadF ToQuadF() const;
void toFloatArray(float[12]) const;
private:
Edge m_left;
Edge m_top;
Edge m_right;
Edge m_bottom;
};
}
#endif // CC_LAYER_QUAD_H_
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