1 files changed, 107 insertions, 0 deletions
diff --git a/src/utils/block_parameters_holder.cc b/src/utils/block_parameters_holder.cc
new file mode 100644
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+++ b/src/utils/block_parameters_holder.cc
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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.
+
+#include "src/utils/block_parameters_holder.h"
+
+#include <algorithm>
+
+#include "src/utils/common.h"
+#include "src/utils/constants.h"
+#include "src/utils/logging.h"
+#include "src/utils/parameter_tree.h"
+#include "src/utils/types.h"
+
+namespace libgav1 {
+
+namespace {
+
+// Returns the number of super block rows/columns for |value4x4| where value4x4
+// is either rows4x4 or columns4x4.
+int RowsOrColumns4x4ToSuperBlocks(int value4x4, bool use_128x128_superblock) {
+  return use_128x128_superblock ? DivideBy128(MultiplyBy4(value4x4) + 127)
+                                : DivideBy64(MultiplyBy4(value4x4) + 63);
+}
+
+}  // namespace
+
+bool BlockParametersHolder::Reset(int rows4x4, int columns4x4,
+                                  bool use_128x128_superblock) {
+  rows4x4_ = rows4x4;
+  columns4x4_ = columns4x4;
+  use_128x128_superblock_ = use_128x128_superblock;
+  if (!block_parameters_cache_.Reset(rows4x4_, columns4x4_)) {
+    LIBGAV1_DLOG(ERROR, "block_parameters_cache_.Reset() failed.");
+    return false;
+  }
+  const int rows =
+      RowsOrColumns4x4ToSuperBlocks(rows4x4_, use_128x128_superblock_);
+  const int columns =
+      RowsOrColumns4x4ToSuperBlocks(columns4x4_, use_128x128_superblock_);
+  const BlockSize sb_size =
+      use_128x128_superblock_ ? kBlock128x128 : kBlock64x64;
+  const int multiplier = kNum4x4BlocksWide[sb_size];
+  if (!trees_.Reset(rows, columns, /*zero_initialize=*/false)) {
+    LIBGAV1_DLOG(ERROR, "trees_.Reset() failed.");
+    return false;
+  }
+  for (int i = 0; i < rows; ++i) {
+    for (int j = 0; j < columns; ++j) {
+      trees_[i][j] =
+          ParameterTree::Create(i * multiplier, j * multiplier, sb_size);
+      if (trees_[i][j] == nullptr) {
+        LIBGAV1_DLOG(ERROR, "Allocation of trees_[%d][%d] failed.", i, j);
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+void BlockParametersHolder::FillCache(int row4x4, int column4x4,
+                                      BlockSize block_size,
+                                      BlockParameters* const bp) {
+  int rows = std::min(static_cast<int>(kNum4x4BlocksHigh[block_size]),
+                      rows4x4_ - row4x4);
+  const int columns = std::min(static_cast<int>(kNum4x4BlocksWide[block_size]),
+                               columns4x4_ - column4x4);
+  auto* bp_dst = &block_parameters_cache_[row4x4][column4x4];
+  // Specialize columns cases (values in kNum4x4BlocksWide[]) for better
+  // performance.
+  if (columns == 1) {
+    SetBlock<BlockParameters*>(rows, 1, bp, bp_dst, columns4x4_);
+  } else if (columns == 2) {
+    SetBlock<BlockParameters*>(rows, 2, bp, bp_dst, columns4x4_);
+  } else if (columns == 4) {
+    SetBlock<BlockParameters*>(rows, 4, bp, bp_dst, columns4x4_);
+  } else if (columns == 8) {
+    SetBlock<BlockParameters*>(rows, 8, bp, bp_dst, columns4x4_);
+  } else if (columns == 16) {
+    SetBlock<BlockParameters*>(rows, 16, bp, bp_dst, columns4x4_);
+  } else if (columns == 32) {
+    SetBlock<BlockParameters*>(rows, 32, bp, bp_dst, columns4x4_);
+  } else {
+    do {
+      // The following loop has better performance than using std::fill().
+      // std::fill() has some overhead in checking zero loop count.
+      int x = columns;
+      auto* d = bp_dst;
+      do {
+        *d++ = bp;
+      } while (--x != 0);
+      bp_dst += columns4x4_;
+    } while (--rows != 0);
+  }
+}
+
+}  // namespace libgav1