--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/lstm/reconfig.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,83 @@
+///////////////////////////////////////////////////////////////////////
+// File:        reconfig.h
+// Description: Network layer that reconfigures the scaling vs feature
+//              depth.
+// Author:      Ray Smith
+//
+// (C) Copyright 2014, Google Inc.
+// 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.
+///////////////////////////////////////////////////////////////////////
+
+#ifndef TESSERACT_LSTM_RECONFIG_H_
+#define TESSERACT_LSTM_RECONFIG_H_
+
+#include "matrix.h"
+#include "network.h"
+
+namespace tesseract {
+
+// Reconfigures (Shrinks) the inputs by concatenating an x_scale by y_scale tile
+// of inputs together, producing a single, deeper output per tile.
+// Note that fractional parts are truncated for efficiency, so make sure the
+// input stride is a multiple of the y_scale factor!
+class Reconfig : public Network {
+public:
+  TESS_API
+  Reconfig(const std::string &name, int ni, int x_scale, int y_scale);
+  ~Reconfig() override = default;
+
+  // Returns the shape output from the network given an input shape (which may
+  // be partially unknown ie zero).
+  StaticShape OutputShape(const StaticShape &input_shape) const override;
+
+  std::string spec() const override {
+    return "S" + std::to_string(y_scale_) + "," + std::to_string(x_scale_);
+  }
+
+  // Returns an integer reduction factor that the network applies to the
+  // time sequence. Assumes that any 2-d is already eliminated. Used for
+  // scaling bounding boxes of truth data.
+  // WARNING: if GlobalMinimax is used to vary the scale, this will return
+  // the last used scale factor. Call it before any forward, and it will return
+  // the minimum scale factor of the paths through the GlobalMinimax.
+  int XScaleFactor() const override;
+
+  // Writes to the given file. Returns false in case of error.
+  bool Serialize(TFile *fp) const override;
+  // Reads from the given file. Returns false in case of error.
+  bool DeSerialize(TFile *fp) override;
+
+  // Runs forward propagation of activations on the input line.
+  // See Network for a detailed discussion of the arguments.
+  void Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
+               NetworkScratch *scratch, NetworkIO *output) override;
+
+  // Runs backward propagation of errors on the deltas line.
+  // See Network for a detailed discussion of the arguments.
+  bool Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
+                NetworkIO *back_deltas) override;
+
+private:
+  void DebugWeights() override {
+    tprintf("Must override Network::DebugWeights for type %d\n", type_);
+  }
+
+protected:
+  // Non-serialized data used to store parameters between forward and back.
+  StrideMap back_map_;
+  // Serialized data.
+  int32_t x_scale_;
+  int32_t y_scale_;
+};
+
+} // namespace tesseract.
+
+#endif // TESSERACT_LSTM_SUBSAMPLE_H_