Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 156 insertions, 0 deletions

diff --git a/third_party/jpeg-xl/lib/jxl/quantizer.cc b/third_party/jpeg-xl/lib/jxl/quantizer.cc
new file mode 100644
index 0000000000..153cf19b21
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/quantizer.cc
@@ -0,0 +1,156 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "lib/jxl/quantizer.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include <algorithm>
+
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/field_encodings.h"
+#include "lib/jxl/fields.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/image_ops.h"
+#include "lib/jxl/quant_weights.h"
+
+namespace jxl {
+
+static const int32_t kDefaultQuant = 64;
+
+constexpr int32_t Quantizer::kQuantMax;
+
+Quantizer::Quantizer(const DequantMatrices* dequant)
+    : Quantizer(dequant, kDefaultQuant, kGlobalScaleDenom / kDefaultQuant) {}
+
+Quantizer::Quantizer(const DequantMatrices* dequant, int quant_dc,
+                     int global_scale)
+    : global_scale_(global_scale), quant_dc_(quant_dc), dequant_(dequant) {
+  JXL_ASSERT(dequant_ != nullptr);
+  RecomputeFromGlobalScale();
+  inv_quant_dc_ = inv_global_scale_ / quant_dc_;
+
+  memcpy(zero_bias_, kZeroBiasDefault, sizeof(kZeroBiasDefault));
+}
+
+void Quantizer::ComputeGlobalScaleAndQuant(float quant_dc, float quant_median,
+                                           float quant_median_absd) {
+  // Target value for the median value in the quant field.
+  const float kQuantFieldTarget = 5;
+  // We reduce the median of the quant field by the median absolute deviation:
+  // higher resolution on highly varying quant fields.
+  float scale = kGlobalScaleDenom * (quant_median - quant_median_absd) /
+                kQuantFieldTarget;
+  // Ensure that new_global_scale is positive and no more than 1<<15.
+  if (scale < 1) scale = 1;
+  if (scale > (1 << 15)) scale = 1 << 15;
+  int new_global_scale = static_cast<int>(scale);
+  // Ensure that quant_dc_ will always be at least
+  // 0.625 * kGlobalScaleDenom/kGlobalScaleNumerator = 10.
+  const int scaled_quant_dc =
+      static_cast<int>(quant_dc * kGlobalScaleNumerator * 1.6);
+  if (new_global_scale > scaled_quant_dc) {
+    new_global_scale = scaled_quant_dc;
+    if (new_global_scale <= 0) new_global_scale = 1;
+  }
+  global_scale_ = new_global_scale;
+  // Code below uses inv_global_scale_.
+  RecomputeFromGlobalScale();
+
+  float fval = quant_dc * inv_global_scale_ + 0.5f;
+  fval = std::min<float>(1 << 16, fval);
+  const int new_quant_dc = static_cast<int>(fval);
+  quant_dc_ = new_quant_dc;
+
+  // quant_dc_ was updated, recompute values.
+  RecomputeFromGlobalScale();
+}
+
+void Quantizer::SetQuantFieldRect(const ImageF& qf, const Rect& rect,
+                                  ImageI* JXL_RESTRICT raw_quant_field) const {
+  for (size_t y = 0; y < rect.ysize(); ++y) {
+    const float* JXL_RESTRICT row_qf = rect.ConstRow(qf, y);
+    int32_t* JXL_RESTRICT row_qi = rect.Row(raw_quant_field, y);
+    for (size_t x = 0; x < rect.xsize(); ++x) {
+      int val = ClampVal(row_qf[x] * inv_global_scale_ + 0.5f);
+      row_qi[x] = val;
+    }
+  }
+}
+
+void Quantizer::SetQuantField(const float quant_dc, const ImageF& qf,
+                              ImageI* JXL_RESTRICT raw_quant_field) {
+  std::vector<float> data(qf.xsize() * qf.ysize());
+  for (size_t y = 0; y < qf.ysize(); ++y) {
+    const float* JXL_RESTRICT row_qf = qf.Row(y);
+    for (size_t x = 0; x < qf.xsize(); ++x) {
+      float quant = row_qf[x];
+      data[qf.xsize() * y + x] = quant;
+    }
+  }
+  std::nth_element(data.begin(), data.begin() + data.size() / 2, data.end());
+  const float quant_median = data[data.size() / 2];
+  std::vector<float> deviations(data.size());
+  for (size_t i = 0; i < data.size(); i++) {
+    deviations[i] = fabsf(data[i] - quant_median);
+  }
+  std::nth_element(deviations.begin(),
+                   deviations.begin() + deviations.size() / 2,
+                   deviations.end());
+  const float quant_median_absd = deviations[deviations.size() / 2];
+  ComputeGlobalScaleAndQuant(quant_dc, quant_median, quant_median_absd);
+  if (raw_quant_field) {
+    JXL_CHECK(SameSize(*raw_quant_field, qf));
+    SetQuantFieldRect(qf, Rect(qf), raw_quant_field);
+  }
+}
+
+void Quantizer::SetQuant(float quant_dc, float quant_ac,
+                         ImageI* JXL_RESTRICT raw_quant_field) {
+  ComputeGlobalScaleAndQuant(quant_dc, quant_ac, 0);
+  int32_t val = ClampVal(quant_ac * inv_global_scale_ + 0.5f);
+  FillImage(val, raw_quant_field);
+}
+
+Status QuantizerParams::VisitFields(Visitor* JXL_RESTRICT visitor) {
+  JXL_QUIET_RETURN_IF_ERROR(visitor->U32(
+      BitsOffset(11, 1), BitsOffset(11, 2049), BitsOffset(12, 4097),
+      BitsOffset(16, 8193), 1, &global_scale));
+  JXL_QUIET_RETURN_IF_ERROR(visitor->U32(Val(16), BitsOffset(5, 1),
+                                         BitsOffset(8, 1), BitsOffset(16, 1), 1,
+                                         &quant_dc));
+  return true;
+}
+
+QuantizerParams Quantizer::GetParams() const {
+  QuantizerParams params;
+  params.global_scale = global_scale_;
+  params.quant_dc = quant_dc_;
+  return params;
+}
+
+Status Quantizer::Decode(BitReader* reader) {
+  QuantizerParams params;
+  JXL_RETURN_IF_ERROR(Bundle::Read(reader, &params));
+  global_scale_ = static_cast<int>(params.global_scale);
+  quant_dc_ = static_cast<int>(params.quant_dc);
+  RecomputeFromGlobalScale();
+  return true;
+}
+
+void Quantizer::DumpQuantizationMap(const ImageI& raw_quant_field) const {
+  printf("Global scale: %d (%.7f)\nDC quant: %d\n", global_scale_,
+         global_scale_ * 1.0 / kGlobalScaleDenom, quant_dc_);
+  printf("AC quantization Map:\n");
+  for (size_t y = 0; y < raw_quant_field.ysize(); ++y) {
+    for (size_t x = 0; x < raw_quant_field.xsize(); ++x) {
+      printf(" %3d", raw_quant_field.Row(y)[x]);
+    }
+    printf("\n");
+  }
+}
+
+}  // namespace jxl