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/*
* Copyright 2020 The libgav1 Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LIBGAV1_SRC_DSP_FILM_GRAIN_COMMON_H_
#define LIBGAV1_SRC_DSP_FILM_GRAIN_COMMON_H_
#include <cstddef>
#include <cstdint>
#include <memory>
#include <type_traits>
#include "src/dsp/common.h"
#include "src/utils/array_2d.h"
#include "src/utils/constants.h"
#include "src/utils/cpu.h"
namespace libgav1 {
template <int bitdepth>
int GetGrainMax() {
return (1 << (bitdepth - 1)) - 1;
}
template <int bitdepth>
int GetGrainMin() {
return -(1 << (bitdepth - 1));
}
inline int GetFilmGrainRandomNumber(int bits, uint16_t* seed) {
uint16_t s = *seed;
uint16_t bit = (s ^ (s >> 1) ^ (s >> 3) ^ (s >> 12)) & 1;
s = (s >> 1) | (bit << 15);
*seed = s;
return s >> (16 - bits);
}
enum {
kAutoRegressionBorder = 3,
// The width of the luma noise array.
kLumaWidth = 82,
// The height of the luma noise array.
kLumaHeight = 73,
// The two possible widths of the chroma noise array.
kMinChromaWidth = 44,
kMaxChromaWidth = 82,
// The two possible heights of the chroma noise array.
kMinChromaHeight = 38,
kMaxChromaHeight = 73,
// The standard scaling lookup table maps bytes to bytes, so only uses 256
// elements, plus one for overflow in 12bpp lookups. The size is scaled up for
// 10bpp.
kScalingLookupTableSize = 257,
// Padding is added to the scaling lookup table to permit overwrites by
// InitializeScalingLookupTable_NEON.
kScalingLookupTablePadding = 6,
// Padding is added to each row of the noise image to permit overreads by
// BlendNoiseWithImageLuma_NEON and overwrites by WriteOverlapLine8bpp_NEON.
kNoiseImagePadding = 15,
// Padding is added to the end of the |noise_stripes_| buffer to permit
// overreads by WriteOverlapLine8bpp_NEON.
kNoiseStripePadding = 7,
}; // anonymous enum
} // namespace libgav1
#endif // LIBGAV1_SRC_DSP_FILM_GRAIN_COMMON_H_
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