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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.
#include "src/dsp/motion_field_projection.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include "src/dsp/dsp.h"
#include "src/utils/common.h"
#include "src/utils/constants.h"
#include "src/utils/reference_info.h"
#include "src/utils/types.h"
namespace libgav1 {
namespace dsp {
namespace {
// Silence unused function warnings when MotionFieldProjectionKernel_C is
// not used.
#if LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS || \
!defined(LIBGAV1_Dsp8bpp_MotionFieldProjectionKernel)
// 7.9.2.
void MotionFieldProjectionKernel_C(const ReferenceInfo& reference_info,
int reference_to_current_with_sign,
int dst_sign, int y8_start, int y8_end,
int x8_start, int x8_end,
TemporalMotionField* motion_field) {
const ptrdiff_t stride = motion_field->mv.columns();
// The column range has to be offset by kProjectionMvMaxHorizontalOffset since
// coordinates in that range could end up being position_x8 because of
// projection.
const int adjusted_x8_start =
std::max(x8_start - kProjectionMvMaxHorizontalOffset, 0);
const int adjusted_x8_end = std::min(
x8_end + kProjectionMvMaxHorizontalOffset, static_cast<int>(stride));
const int8_t* const reference_offsets =
reference_info.relative_distance_to.data();
const bool* const skip_references = reference_info.skip_references.data();
const int16_t* const projection_divisions =
reference_info.projection_divisions.data();
const ReferenceFrameType* source_reference_types =
&reference_info.motion_field_reference_frame[y8_start][0];
const MotionVector* mv = &reference_info.motion_field_mv[y8_start][0];
int8_t* dst_reference_offset = motion_field->reference_offset[y8_start];
MotionVector* dst_mv = motion_field->mv[y8_start];
assert(stride == motion_field->reference_offset.columns());
assert((y8_start & 7) == 0);
int y8 = y8_start;
do {
const int y8_floor = (y8 & ~7) - y8;
const int y8_ceiling = std::min(y8_end - y8, y8_floor + 8);
int x8 = adjusted_x8_start;
do {
const int source_reference_type = source_reference_types[x8];
if (skip_references[source_reference_type]) continue;
MotionVector projection_mv;
// reference_to_current_with_sign could be 0.
GetMvProjection(mv[x8], reference_to_current_with_sign,
projection_divisions[source_reference_type],
&projection_mv);
// Do not update the motion vector if the block position is not valid or
// if position_x8 is outside the current range of x8_start and x8_end.
// Note that position_y8 will always be within the range of y8_start and
// y8_end.
const int position_y8 = Project(0, projection_mv.mv[0], dst_sign);
if (position_y8 < y8_floor || position_y8 >= y8_ceiling) continue;
const int x8_base = x8 & ~7;
const int x8_floor =
std::max(x8_start, x8_base - kProjectionMvMaxHorizontalOffset);
const int x8_ceiling =
std::min(x8_end, x8_base + 8 + kProjectionMvMaxHorizontalOffset);
const int position_x8 = Project(x8, projection_mv.mv[1], dst_sign);
if (position_x8 < x8_floor || position_x8 >= x8_ceiling) continue;
dst_mv[position_y8 * stride + position_x8] = mv[x8];
dst_reference_offset[position_y8 * stride + position_x8] =
reference_offsets[source_reference_type];
} while (++x8 < adjusted_x8_end);
source_reference_types += stride;
mv += stride;
dst_reference_offset += stride;
dst_mv += stride;
} while (++y8 < y8_end);
}
#endif // LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS ||
// !defined(LIBGAV1_Dsp8bpp_MotionFieldProjectionKernel)
} // namespace
void MotionFieldProjectionInit_C() {
#if LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS || \
!defined(LIBGAV1_Dsp8bpp_MotionFieldProjectionKernel)
Dsp* const dsp = dsp_internal::GetWritableDspTable(kBitdepth8);
assert(dsp != nullptr);
dsp->motion_field_projection_kernel = MotionFieldProjectionKernel_C;
#endif
}
} // namespace dsp
} // namespace libgav1
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