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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_WARP_H_
#define LIBGAV1_SRC_DSP_WARP_H_
// 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/warp_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/warp_sse4.h"
// clang-format on
// IWYU pragma: end_exports
namespace libgav1 {
namespace dsp {
// Section 7.11.3.5.
struct WarpFilterParams {
int64_t x4;
int64_t y4;
int ix4;
int iy4;
};
// Initializes Dsp::warp. This function is not thread-safe.
void WarpInit_C();
// Section 7.11.3.5.
inline WarpFilterParams GetWarpFilterParams(int src_x, int src_y,
int subsampling_x,
int subsampling_y,
const int* warp_params) {
WarpFilterParams filter_params;
// warp_params[2]/[5] require 17 bits (the others 14). With large resolutions
// the result of the multiplication will require 33.
const int64_t dst_x = static_cast<int64_t>(src_x) * warp_params[2] +
src_y * warp_params[3] + warp_params[0];
const int64_t dst_y = src_x * warp_params[4] +
static_cast<int64_t>(src_y) * warp_params[5] +
warp_params[1];
filter_params.x4 = dst_x >> subsampling_x;
filter_params.y4 = dst_y >> subsampling_y;
filter_params.ix4 =
static_cast<int>(filter_params.x4 >> kWarpedModelPrecisionBits);
filter_params.iy4 =
static_cast<int>(filter_params.y4 >> kWarpedModelPrecisionBits);
return filter_params;
}
} // namespace dsp
} // namespace libgav1
#endif // LIBGAV1_SRC_DSP_WARP_H_
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