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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_RESOURCES_LAYER_QUAD_H_
#define CC_RESOURCES_LAYER_QUAD_H_
#include "base/basictypes.h"
#include "cc/base/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() : x_(0), y_(0), z_(0) {}
Edge(const gfx::PointF& p, const gfx::PointF& q);
float x() const { return x_; }
float y() const { return y_; }
float z() const { return z_; }
void set_x(float x) { x_ = x; }
void set_y(float y) { y_ = y; }
void set_z(float z) { z_ = z; }
void set(float x, float y, float z) {
x_ = x;
y_ = y;
z_ = z;
}
void move_x(float dx) { x_ += dx; }
void move_y(float dy) { y_ += dy; }
void move_z(float dz) { z_ += dz; }
void move(float dx, float dy, float dz) {
x_ += dx;
y_ += dy;
z_ += dz;
}
void scale_x(float sx) { x_ *= sx; }
void scale_y(float sy) { y_ *= sy; }
void scale_z(float sz) { z_ *= sz; }
void scale(float sx, float sy, float sz) {
x_ *= sx;
y_ *= sy;
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 x_;
float y_;
float z_;
};
LayerQuad(const Edge& left,
const Edge& top,
const Edge& right,
const Edge& bottom);
explicit LayerQuad(const gfx::QuadF& quad);
Edge left() const { return left_; }
Edge top() const { return top_; }
Edge right() const { return right_; }
Edge bottom() const { return bottom_; }
void InflateX(float dx) {
left_.move_z(dx);
right_.move_z(dx);
}
void InflateY(float dy) {
top_.move_z(dy);
bottom_.move_z(dy);
}
void Inflate(float d) {
InflateX(d);
InflateY(d);
}
void InflateAntiAliasingDistance() {
Inflate(kAntiAliasingInflateDistance);
}
gfx::QuadF ToQuadF() const;
void ToFloatArray(float flattened[12]) const;
private:
Edge left_;
Edge top_;
Edge right_;
Edge bottom_;
DISALLOW_COPY_AND_ASSIGN(LayerQuad);
};
} // namespace cc
#endif // CC_RESOURCES_LAYER_QUAD_H_
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