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/*
* Copyright 2019 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_CONVOLVE_H_
#define LIBGAV1_SRC_DSP_CONVOLVE_H_
#include <cassert>
// Pull in LIBGAV1_DspXXX defines representing the implementation status
// of each function. The resulting value of each can be used by each module to
// determine whether an implementation is needed at compile time.
// IWYU pragma: begin_exports
// ARM:
#include "src/dsp/arm/convolve_neon.h"
// x86:
// Note includes should be sorted in logical order avx2/avx/sse4, etc.
// The order of includes is important as each tests for a superior version
// before setting the base.
// clang-format off
#include "src/dsp/x86/convolve_avx2.h"
#include "src/dsp/x86/convolve_sse4.h"
// clang-format on
// IWYU pragma: end_exports
namespace libgav1 {
namespace dsp {
// Initializes Dsp::convolve and Dsp::convolve_scale. This function is not
// thread-safe.
void ConvolveInit_C();
inline int GetNumTapsInFilter(const int filter_index) {
if (filter_index < 2) {
// Despite the names these only use 6 taps.
// kInterpolationFilterEightTap
// kInterpolationFilterEightTapSmooth
return 6;
}
if (filter_index == 2) {
// kInterpolationFilterEightTapSharp
return 8;
}
if (filter_index == 3) {
// kInterpolationFilterBilinear
return 2;
}
assert(filter_index > 3);
// For small sizes (width/height <= 4) the large filters are replaced with 4
// tap options.
// If the original filters were |kInterpolationFilterEightTap| or
// |kInterpolationFilterEightTapSharp| then it becomes
// |kInterpolationFilterSwitchable|.
// If it was |kInterpolationFilterEightTapSmooth| then it becomes an unnamed 4
// tap filter.
return 4;
}
} // namespace dsp
} // namespace libgav1
#endif // LIBGAV1_SRC_DSP_CONVOLVE_H_
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