1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/enc_chroma_from_luma.h b/third_party/jpeg-xl/lib/jxl/enc_chroma_from_luma.h
new file mode 100644
index 0000000000..04743842bf
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+++ b/third_party/jpeg-xl/lib/jxl/enc_chroma_from_luma.h
@@ -0,0 +1,60 @@
+// 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.
+
+#ifndef LIB_JXL_ENC_CHROMA_FROM_LUMA_H_
+#define LIB_JXL_ENC_CHROMA_FROM_LUMA_H_
+
+// Chroma-from-luma, computed using heuristics to determine the best linear
+// model for the X and B channels from the Y channel.
+
+#include <cstddef>
+#include <hwy/aligned_allocator.h>
+
+#include "lib/jxl/ac_strategy.h"
+#include "lib/jxl/chroma_from_luma.h"
+#include "lib/jxl/enc_bit_writer.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/quant_weights.h"
+#include "lib/jxl/simd_util.h"
+
+namespace jxl {
+
+struct AuxOut;
+class Quantizer;
+
+void ColorCorrelationMapEncodeDC(const ColorCorrelationMap& map,
+                                 BitWriter* writer, size_t layer,
+                                 AuxOut* aux_out);
+
+struct CfLHeuristics {
+  void Init(const Rect& rect);
+
+  void PrepareForThreads(size_t num_threads) {
+    mem = hwy::AllocateAligned<float>(num_threads * ItemsPerThread());
+  }
+
+  void ComputeTile(const Rect& r, const Image3F& opsin, const Rect& opsin_rect,
+                   const DequantMatrices& dequant,
+                   const AcStrategyImage* ac_strategy,
+                   const ImageI* raw_quant_field, const Quantizer* quantizer,
+                   bool fast, size_t thread, ColorCorrelationMap* cmap);
+
+  ImageF dc_values;
+  hwy::AlignedFreeUniquePtr<float[]> mem;
+
+  // Working set is too large for stack; allocate dynamically.
+  static size_t ItemsPerThread() {
+    const size_t dct_scratch_size =
+        3 * (MaxVectorSize() / sizeof(float)) * AcStrategy::kMaxBlockDim;
+    return AcStrategy::kMaxCoeffArea * 3        // Blocks
+           + kColorTileDim * kColorTileDim * 4  // AC coeff storage
+           + AcStrategy::kMaxCoeffArea * 2      // Scratch space
+           + dct_scratch_size;
+  }
+};
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_CHROMA_FROM_LUMA_H_