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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkLights_DEFINED
- #define SkLights_DEFINED
- #include "include/core/SkPoint3.h"
- #include "include/core/SkRefCnt.h"
- #include "include/private/SkTArray.h"
- class SkReadBuffer;
- class SkWriteBuffer;
- /** \class SkLights
- SkLights encapsulates a set of directional, point and ambient lights for use with the
- SkLightingShader.
- */
- class SK_API SkLights : public SkRefCnt {
- public:
- class Light {
- public:
- enum LightType {
- kDirectional_LightType,
- kPoint_LightType
- };
- Light(const Light& other)
- : fType(other.fType)
- , fColor(other.fColor)
- , fDirOrPos(other.fDirOrPos)
- , fIntensity(other.fIntensity) {}
- Light(Light&& other)
- : fType(other.fType)
- , fColor(other.fColor)
- , fDirOrPos(other.fDirOrPos)
- , fIntensity(other.fIntensity) {}
- static Light MakeDirectional(const SkColor3f& color, const SkVector3& dir) {
- Light light(kDirectional_LightType, color, dir, 0.0f);
- if (!light.fDirOrPos.normalize()) {
- light.fDirOrPos.set(0.0f, 0.0f, 1.0f);
- }
- return light;
- }
- static Light MakePoint(const SkColor3f& color, const SkPoint3& pos, SkScalar intensity) {
- return Light(kPoint_LightType, color, pos, intensity);
- }
- LightType type() const { return fType; }
- const SkColor3f& color() const { return fColor; }
- const SkVector3& dir() const {
- SkASSERT(kDirectional_LightType == fType);
- return fDirOrPos;
- }
- const SkPoint3& pos() const {
- SkASSERT(kPoint_LightType == fType);
- return fDirOrPos;
- }
- SkScalar intensity() const {
- SkASSERT(kPoint_LightType == fType);
- return fIntensity;
- }
- Light& operator=(const Light& other) {
- if (this == &other) {
- return *this;
- }
- fType = other.fType;
- fColor = other.fColor;
- fDirOrPos = other.fDirOrPos;
- fIntensity = other.fIntensity;
- return *this;
- }
- bool operator==(const Light& other) {
- return (fType == other.fType) &&
- (fColor == other.fColor) &&
- (fDirOrPos == other.fDirOrPos) &&
- (fIntensity == other.fIntensity);
- }
- bool operator!=(const Light& other) { return !(this->operator==(other)); }
- private:
- friend class SkLights;
- Light(LightType type, const SkColor3f& color, const SkVector3& dirOrPos,
- SkScalar intensity)
- : fType(type)
- , fColor(color)
- , fDirOrPos(dirOrPos)
- , fIntensity(intensity) {}
- LightType fType;
- SkColor3f fColor; // linear (unpremul) color. Range is 0..1 in each channel.
- SkVector3 fDirOrPos; // For directional lights, holds the direction towards the
- // light (+Z is out of the screen).
- // If degenerate, it will be replaced with (0, 0, 1).
- // For point lights, holds location of point light
- SkScalar fIntensity; // For point lights, dictates the light intensity.
- // Simply a multiplier to the final light output value.
- };
- class Builder {
- public:
- Builder() : fLights(new SkLights) {}
- void add(const Light& light) {
- if (fLights) {
- fLights->fLights.push_back(light);
- }
- }
- void add(Light&& light) {
- if (fLights) {
- fLights->fLights.push_back(std::move(light));
- }
- }
- void setAmbientLightColor(const SkColor3f& color) {
- if (fLights) {
- fLights->fAmbientLightColor = color;
- }
- }
- sk_sp<SkLights> finish() {
- return std::move(fLights);
- }
- private:
- sk_sp<SkLights> fLights;
- };
- /** Returns number of lights not including the ambient light.
- @return number of lights not including the ambient light
- */
- int numLights() const { return fLights.count(); }
- /** Returns the index-th light.
- @param index the index of the desired light
- @return the index-th light
- */
- const Light& light(int index) const { return fLights[index]; }
- /** Returns the ambient light.
- @return the ambient light
- */
- const SkColor3f& ambientLightColor() const {
- return fAmbientLightColor;
- }
- /**
- * Recreate an SkLights object that was serialized into a buffer.
- *
- * @param SkReadBuffer Serialized blob data.
- * @return A new SkLights representing the serialized data, or NULL if the buffer is
- * invalid.
- */
- static sk_sp<SkLights> MakeFromBuffer(SkReadBuffer& buf);
- /**
- * Serialize to a buffer.
- *
- * @param buffer the write buffer to write out to
- */
- void flatten(SkWriteBuffer& buf) const;
- private:
- friend class SkLightingShaderImpl;
- SkLights() : fAmbientLightColor(SkColor3f::Make(0.0f, 0.0f, 0.0f)) {}
- SkTArray<Light> fLights;
- SkColor3f fAmbientLightColor;
- typedef SkRefCnt INHERITED;
- };
- #endif
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