| /* |
| * 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_ |