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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 fX * other.fX + fY * other.fY + fZ * other.fZ;
}
SkScalar maxComponent() const {
return fX > fY ? (fX > fZ ? fX : fZ) : (fY > fZ ? fY : fZ);
}
void normalize() {
// Small epsilon is added to prevent division by 0.
SkScalar scale = SkScalarInvert(SkScalarSqrt(dot(*this)) + SK_ScalarNearlyZero);
fX = fX * scale;
fY = fY * scale;
fZ = fZ * scale;
}
SkPoint3 operator*(SkScalar scalar) const {
return SkPoint3(fX * scalar, fY * scalar, 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,
SkImageFilter* input = NULL, const CropRect* cropRect = NULL);
static SkImageFilter* CreatePointLitDiffuse(const SkPoint3& location,
SkColor lightColor, SkScalar surfaceScale, SkScalar kd,
SkImageFilter* input = NULL, const CropRect* cropRect = NULL);
static SkImageFilter* CreateSpotLitDiffuse(const SkPoint3& location,
const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle,
SkColor lightColor, SkScalar surfaceScale, SkScalar kd,
SkImageFilter* input = NULL, const CropRect* cropRect = NULL);
static SkImageFilter* CreateDistantLitSpecular(const SkPoint3& direction,
SkColor lightColor, SkScalar surfaceScale, SkScalar ks,
SkScalar shininess, SkImageFilter* input = NULL, const CropRect* cropRect = NULL);
static SkImageFilter* CreatePointLitSpecular(const SkPoint3& location,
SkColor lightColor, SkScalar surfaceScale, SkScalar ks,
SkScalar shininess, SkImageFilter* input = NULL, const CropRect* cropRect = NULL);
static SkImageFilter* CreateSpotLitSpecular(const SkPoint3& location,
const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle,
SkColor lightColor, SkScalar surfaceScale, SkScalar ks,
SkScalar shininess, SkImageFilter* input = NULL, const CropRect* cropRect = NULL);
~SkLightingImageFilter();
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
protected:
SkLightingImageFilter(SkLight* light,
SkScalar surfaceScale,
SkImageFilter* input,
const CropRect* cropRect);
void flatten(SkWriteBuffer&) const override;
const SkLight* light() const { return fLight.get(); }
SkScalar surfaceScale() const { return fSurfaceScale; }
private:
typedef SkImageFilter INHERITED;
SkAutoTUnref<SkLight> fLight;
SkScalar fSurfaceScale;
};
#endif
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