1 files changed, 34 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/compressed_dc.h b/third_party/jpeg-xl/lib/jxl/compressed_dc.h
new file mode 100644
index 0000000000..b06e5931f0
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/compressed_dc.h
@@ -0,0 +1,34 @@
+// 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_COMPRESSED_DC_H_
+#define LIB_JXL_COMPRESSED_DC_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/ac_context.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/frame_header.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/modular/modular_image.h"
+
+// DC handling functions: encoding and decoding of DC to and from bitstream, and
+// related function to initialize the per-group decoder cache.
+
+namespace jxl {
+
+// Smooth DC in already-smooth areas, to counteract banding.
+void AdaptiveDCSmoothing(const float* dc_factors, Image3F* dc,
+                         ThreadPool* pool);
+
+void DequantDC(const Rect& r, Image3F* dc, ImageB* quant_dc, const Image& in,
+               const float* dc_factors, float mul, const float* cfl_factors,
+               YCbCrChromaSubsampling chroma_subsampling,
+               const BlockCtxMap& bctx);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_COMPRESSED_DC_H_