static SkData* make_3Dlut(int* cubeDimension, bool invR, bool invG, bool invB) {
int size = 4 << R(5);
SkData* data = SkData::NewUninitialized(sizeof(SkColor) * size * size * size);
SkColor* pixels = (SkColor*)(data->writable_data());
SkAutoTMalloc<uint8_t> lutMemory(size);
SkAutoTMalloc<uint8_t> invLutMemory(size);
uint8_t* lut = lutMemory.get();
uint8_t* invLut = invLutMemory.get();
const int maxIndex = size - 1;
for (int i = 0; i < size; i++) {
lut[i] = (i * 255) / maxIndex;
invLut[i] = ((maxIndex - i) * 255) / maxIndex;
}
for (int r = 0; r < size; ++r) {
for (int g = 0; g < size; ++g) {
for (int b = 0; b < size; ++b) {
pixels[(size * ((size * b) + g)) + r] = SkColorSetARGB(0xFF,
invR ? invLut[r] : lut[r],
invG ? invLut[g] : lut[g],
invB ? invLut[b] : lut[b]);
}
}
}
if (cubeDimension) {
*cubeDimension = size;
}
return data;
}
void make_3Dlut(SkData** data, int size, bool invR, bool invG, bool invB) {
*data = SkData::NewUninitialized(sizeof(SkColor) * size * size * size);
SkColor* pixels = (SkColor*)((*data)->writable_data());
SkAutoMalloc lutMemory(size);
SkAutoMalloc invLutMemory(size);
uint8_t* lut = (uint8_t*)lutMemory.get();
uint8_t* invLut = (uint8_t*)invLutMemory.get();
const int maxIndex = size - 1;
for (int i = 0; i < size; i++) {
lut[i] = (i * 255) / maxIndex;
invLut[i] = ((maxIndex - i) * 255) / maxIndex;
}
for (int r = 0; r < size; ++r) {
for (int g = 0; g < size; ++g) {
for (int b = 0; b < size; ++b) {
pixels[(size * ((size * b) + g)) + r] = SkColorSetARGB(0xFF,
invR ? invLut[r] : lut[r],
invG ? invLut[g] : lut[g],
invB ? invLut[b] : lut[b]);
}
}
}
}
