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/*
* Copyright 2012 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLightingImageFilter_DEFINED
#define SkLightingImageFilter_DEFINED
#include "SkImageFilter.h"
#include "SkColor.h"
class SK_API SkPoint3 {
public:
SkPoint3() {}
SkPoint3(SkScalar x, SkScalar y, SkScalar z)
: fX(x), fY(y), fZ(z) {}
SkScalar dot(const SkPoint3& other) const {
return SkScalarMul(fX, other.fX)
+ SkScalarMul(fY, other.fY)
+ SkScalarMul(fZ, other.fZ);
}
SkScalar maxComponent() const {
return fX > fY ? (fX > fZ ? fX : fZ) : (fY > fZ ? fY : fZ);
}
void normalize() {
SkScalar scale = SkScalarInvert(SkScalarSqrt(dot(*this)));
fX = SkScalarMul(fX, scale);
fY = SkScalarMul(fY, scale);
fZ = SkScalarMul(fZ, scale);
}
SkPoint3 operator*(SkScalar scalar) const {
return SkPoint3(SkScalarMul(fX, scalar),
SkScalarMul(fY, scalar),
SkScalarMul(fZ, scalar));
}
SkPoint3 operator-(const SkPoint3& other) const {
return SkPoint3(fX - other.fX, fY - other.fY, fZ - other.fZ);
}
bool operator==(const SkPoint3& other) const {
return fX == other.fX && fY == other.fY && fZ == other.fZ;
}
SkScalar fX, fY, fZ;
};
class SkLight;
class SK_API SkLightingImageFilter : public SkImageFilter {
public:
static SkImageFilter* CreateDistantLitDiffuse(const SkPoint3& direction,
SkColor lightColor, SkScalar surfaceScale, SkScalar kd);
static SkImageFilter* CreatePointLitDiffuse(const SkPoint3& location,
SkColor lightColor, SkScalar surfaceScale, SkScalar kd);
static SkImageFilter* CreateSpotLitDiffuse(const SkPoint3& location,
const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle,
SkColor lightColor, SkScalar surfaceScale, SkScalar kd);
static SkImageFilter* CreateDistantLitSpecular(const SkPoint3& direction,
SkColor lightColor, SkScalar surfaceScale, SkScalar ks,
SkScalar shininess);
static SkImageFilter* CreatePointLitSpecular(const SkPoint3& location,
SkColor lightColor, SkScalar surfaceScale, SkScalar ks,
SkScalar shininess);
static SkImageFilter* CreateSpotLitSpecular(const SkPoint3& location,
const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle,
SkColor lightColor, SkScalar surfaceScale, SkScalar ks,
SkScalar shininess);
~SkLightingImageFilter();
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
protected:
SkLightingImageFilter(SkLight* light, SkScalar surfaceScale);
explicit SkLightingImageFilter(SkFlattenableReadBuffer& buffer);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
const SkLight* light() const { return fLight; }
SkScalar surfaceScale() const { return fSurfaceScale; }
private:
typedef SkImageFilter INHERITED;
SkLight* fLight;
SkScalar fSurfaceScale;
};
#endif
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