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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkColorCubeFilter_DEFINED
#define SkColorCubeFilter_DEFINED
#include "SkColorFilter.h"
#include "SkData.h"
#include "../private/SkMutex.h"
#include "../private/SkTemplates.h"
class SK_API SkColorCubeFilter : public SkColorFilter {
public:
/** cubeData must containt a 3D data in the form of cube of the size:
* cubeDimension * cubeDimension * cubeDimension * sizeof(SkColor)
* This cube contains a transform where (x,y,z) maps to the (r,g,b).
* The alpha components of the colors must be 0xFF.
*/
static SkColorFilter* Create(SkData* cubeData, int cubeDimension);
void filterSpan(const SkPMColor src[], int count, SkPMColor[]) const override;
uint32_t getFlags() const override;
#if SK_SUPPORT_GPU
const GrFragmentProcessor* asFragmentProcessor(GrContext*) const override;
#endif
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorCubeFilter)
protected:
SkColorCubeFilter(SkData* cubeData, int cubeDimension);
void flatten(SkWriteBuffer&) const override;
private:
/** The cache is initialized on-demand when getProcessingLuts is called.
*/
class ColorCubeProcesingCache {
public:
ColorCubeProcesingCache(int cubeDimension);
void getProcessingLuts(const int* (*colorToIndex)[2],
const SkScalar* (*colorToFactors)[2],
const SkScalar** colorToScalar);
int cubeDimension() const { return fCubeDimension; }
private:
// Working pointers. If any of these is NULL,
// we need to recompute the corresponding cache values.
int* fColorToIndex[2];
SkScalar* fColorToFactors[2];
SkScalar* fColorToScalar;
SkAutoTMalloc<uint8_t> fLutStorage;
const int fCubeDimension;
// Make sure we only initialize the caches once.
SkMutex fLutsMutex;
bool fLutsInited;
static void initProcessingLuts(ColorCubeProcesingCache* cache);
};
sk_sp<SkData> fCubeData;
int32_t fUniqueID;
mutable ColorCubeProcesingCache fCache;
typedef SkColorFilter INHERITED;
};
#endif
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