1 files changed, 125 insertions, 0 deletions
diff --git a/src/dsp/obmc.cc b/src/dsp/obmc.cc
new file mode 100644
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--- /dev/null
+++ b/src/dsp/obmc.cc
@@ -0,0 +1,125 @@
+// 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.
+
+#include "src/dsp/obmc.h"
+
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+
+#include "src/dsp/dsp.h"
+#include "src/utils/common.h"
+#include "src/utils/constants.h"
+
+namespace libgav1 {
+namespace dsp {
+namespace {
+
+#include "src/dsp/obmc.inc"
+
+// 7.11.3.10 (from top samples).
+template <typename Pixel>
+void OverlapBlendVertical_C(void* const prediction,
+                            const ptrdiff_t prediction_stride, const int width,
+                            const int height, const void* const obmc_prediction,
+                            const ptrdiff_t obmc_prediction_stride) {
+  auto* pred = static_cast<Pixel*>(prediction);
+  const ptrdiff_t pred_stride = prediction_stride / sizeof(Pixel);
+  const auto* obmc_pred = static_cast<const Pixel*>(obmc_prediction);
+  const ptrdiff_t obmc_pred_stride = obmc_prediction_stride / sizeof(Pixel);
+  const uint8_t* const mask = kObmcMask + height - 2;
+
+  for (int y = 0; y < height; ++y) {
+    const uint8_t mask_value = mask[y];
+    for (int x = 0; x < width; ++x) {
+      pred[x] = static_cast<Pixel>(RightShiftWithRounding(
+          mask_value * pred[x] + (64 - mask_value) * obmc_pred[x], 6));
+    }
+    pred += pred_stride;
+    obmc_pred += obmc_pred_stride;
+  }
+}
+
+// 7.11.3.10 (from left samples).
+template <typename Pixel>
+void OverlapBlendHorizontal_C(void* const prediction,
+                              const ptrdiff_t prediction_stride,
+                              const int width, const int height,
+                              const void* const obmc_prediction,
+                              const ptrdiff_t obmc_prediction_stride) {
+  auto* pred = static_cast<Pixel*>(prediction);
+  const ptrdiff_t pred_stride = prediction_stride / sizeof(Pixel);
+  const auto* obmc_pred = static_cast<const Pixel*>(obmc_prediction);
+  const ptrdiff_t obmc_pred_stride = obmc_prediction_stride / sizeof(Pixel);
+  const uint8_t* const mask = kObmcMask + width - 2;
+  for (int y = 0; y < height; ++y) {
+    for (int x = 0; x < width; ++x) {
+      const uint8_t mask_value = mask[x];
+      pred[x] = static_cast<Pixel>(RightShiftWithRounding(
+          mask_value * pred[x] + (64 - mask_value) * obmc_pred[x], 6));
+    }
+    pred += pred_stride;
+    obmc_pred += obmc_pred_stride;
+  }
+}
+
+void Init8bpp() {
+  Dsp* const dsp = dsp_internal::GetWritableDspTable(8);
+  assert(dsp != nullptr);
+#if LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS
+  dsp->obmc_blend[kObmcDirectionVertical] = OverlapBlendVertical_C<uint8_t>;
+  dsp->obmc_blend[kObmcDirectionHorizontal] = OverlapBlendHorizontal_C<uint8_t>;
+#else  // !LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS
+  static_cast<void>(dsp);
+#ifndef LIBGAV1_Dsp8bpp_ObmcVertical
+  dsp->obmc_blend[kObmcDirectionVertical] = OverlapBlendVertical_C<uint8_t>;
+#endif
+#ifndef LIBGAV1_Dsp8bpp_ObmcHorizontal
+  dsp->obmc_blend[kObmcDirectionHorizontal] = OverlapBlendHorizontal_C<uint8_t>;
+#endif
+#endif  // LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS
+}
+
+#if LIBGAV1_MAX_BITDEPTH >= 10
+void Init10bpp() {
+  Dsp* const dsp = dsp_internal::GetWritableDspTable(10);
+  assert(dsp != nullptr);
+#if LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS
+  dsp->obmc_blend[kObmcDirectionVertical] = OverlapBlendVertical_C<uint16_t>;
+  dsp->obmc_blend[kObmcDirectionHorizontal] =
+      OverlapBlendHorizontal_C<uint16_t>;
+#else  // !LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS
+  static_cast<void>(dsp);
+#ifndef LIBGAV1_Dsp10bpp_ObmcVertical
+  dsp->obmc_blend[kObmcDirectionVertical] = OverlapBlendVertical_C<uint16_t>;
+#endif
+#ifndef LIBGAV1_Dsp10bpp_ObmcHorizontal
+  dsp->obmc_blend[kObmcDirectionHorizontal] =
+      OverlapBlendHorizontal_C<uint16_t>;
+#endif
+#endif  // LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS
+}
+#endif
+
+}  // namespace
+
+void ObmcInit_C() {
+  Init8bpp();
+#if LIBGAV1_MAX_BITDEPTH >= 10
+  Init10bpp();
+#endif
+}
+
+}  // namespace dsp
+}  // namespace libgav1