--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/viewer/scrollview.cpp	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,833 @@
+///////////////////////////////////////////////////////////////////////
+// File:        scrollview.cpp
+// Description: ScrollView
+// Author:      Joern Wanke
+//
+// (C) Copyright 2007, 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.
+//
+///////////////////////////////////////////////////////////////////////
+//
+
+// Include automatically generated configuration file if running autoconf.
+#ifdef HAVE_CONFIG_H
+#  include "config_auto.h"
+#endif
+
+#include "scrollview.h"
+
+#include "svutil.h" // for SVNetwork
+
+#include <allheaders.h>
+
+#include <algorithm>
+#include <climits>
+#include <cstdarg>
+#include <cstring>
+#include <map>
+#include <memory> // for std::unique_ptr
+#include <mutex> // for std::mutex
+#include <string>
+#include <thread> // for std::thread
+#include <utility>
+#include <vector>
+
+namespace tesseract {
+
+const int kSvPort = 8461;
+const int kMaxMsgSize = 4096;
+const int kMaxIntPairSize = 45; // Holds %d,%d, for up to 64 bit.
+
+struct SVPolyLineBuffer {
+  bool empty; // Independent indicator to allow SendMsg to call SendPolygon.
+  std::vector<int> xcoords;
+  std::vector<int> ycoords;
+};
+
+// A map between the window IDs and their corresponding pointers.
+static std::map<int, ScrollView *> svmap;
+static std::mutex *svmap_mu;
+// A map of all semaphores waiting for a specific event on a specific window.
+static std::map<std::pair<ScrollView *, SVEventType>,
+                std::pair<SVSemaphore *, std::unique_ptr<SVEvent>>> waiting_for_events;
+static std::mutex *waiting_for_events_mu;
+
+std::unique_ptr<SVEvent> SVEvent::copy() const {
+  auto any = std::unique_ptr<SVEvent>(new SVEvent);
+  any->command_id = command_id;
+  any->counter = counter;
+  any->parameter = new char[strlen(parameter) + 1];
+  strcpy(any->parameter, parameter);
+  any->type = type;
+  any->x = x;
+  any->y = y;
+  any->x_size = x_size;
+  any->y_size = y_size;
+  any->window = window;
+  return any;
+}
+
+// Destructor.
+// It is defined here, so the compiler can create a single vtable
+// instead of weak vtables in every compilation unit.
+SVEventHandler::~SVEventHandler() = default;
+
+#ifndef GRAPHICS_DISABLED
+/// This is the main loop which handles the ScrollView-logic from the server
+/// to the client. It basically loops through messages, parses them to events
+/// and distributes it to the waiting handlers.
+/// It is run from a different thread and synchronizes via SVSync.
+void ScrollView::MessageReceiver() {
+  int counter_event_id = 0; // ongoing counter
+  char *message = nullptr;
+  // Wait until a new message appears in the input stream_.
+  do {
+    message = ScrollView::GetStream()->Receive();
+  } while (message == nullptr);
+
+  // This is the main loop which iterates until the server is dead (strlen =
+  // -1). It basically parses for 3 different messagetypes and then distributes
+  // the events accordingly.
+  while (true) {
+    // The new event we create.
+    std::unique_ptr<SVEvent> cur(new SVEvent);
+    // The ID of the corresponding window.
+    int window_id;
+
+    int ev_type;
+
+    int n;
+    // Fill the new SVEvent properly.
+    sscanf(message, "%d,%d,%d,%d,%d,%d,%d,%n", &window_id, &ev_type, &cur->x, &cur->y, &cur->x_size,
+           &cur->y_size, &cur->command_id, &n);
+    char *p = (message + n);
+
+    svmap_mu->lock();
+    cur->window = svmap[window_id];
+
+    if (cur->window != nullptr) {
+      auto length = strlen(p);
+      cur->parameter = new char[length + 1];
+      strcpy(cur->parameter, p);
+      if (length > 0) { // remove the last \n
+        cur->parameter[length - 1] = '\0';
+      }
+      cur->type = static_cast<SVEventType>(ev_type);
+      // Correct selection coordinates so x,y is the min pt and size is +ve.
+      if (cur->x_size > 0) {
+        cur->x -= cur->x_size;
+      } else {
+        cur->x_size = -cur->x_size;
+      }
+      if (cur->y_size > 0) {
+        cur->y -= cur->y_size;
+      } else {
+        cur->y_size = -cur->y_size;
+      }
+      // Returned y will be the bottom-left if y is reversed.
+      if (cur->window->y_axis_is_reversed_) {
+        cur->y = cur->window->TranslateYCoordinate(cur->y + cur->y_size);
+      }
+      cur->counter = counter_event_id;
+      // Increase by 2 since we will also create an SVET_ANY event from cur,
+      // which will have a counter_id of cur + 1 (and thus gets processed
+      // after cur).
+      counter_event_id += 2;
+
+      // In case of an SVET_EXIT event, quit the whole application.
+      if (ev_type == SVET_EXIT) {
+        SendRawMessage("svmain:exit()");
+        break;
+      }
+
+      // Place two copies of it in the table for the window.
+      cur->window->SetEvent(cur.get());
+
+      // Check if any of the threads currently waiting want it.
+      std::pair<ScrollView *, SVEventType> awaiting_list(cur->window, cur->type);
+      std::pair<ScrollView *, SVEventType> awaiting_list_any(cur->window, SVET_ANY);
+      std::pair<ScrollView *, SVEventType> awaiting_list_any_window((ScrollView *)nullptr,
+                                                                    SVET_ANY);
+      waiting_for_events_mu->lock();
+      if (waiting_for_events.count(awaiting_list) > 0) {
+        waiting_for_events[awaiting_list].second = std::move(cur);
+        waiting_for_events[awaiting_list].first->Signal();
+      } else if (waiting_for_events.count(awaiting_list_any) > 0) {
+        waiting_for_events[awaiting_list_any].second = std::move(cur);
+        waiting_for_events[awaiting_list_any].first->Signal();
+      } else if (waiting_for_events.count(awaiting_list_any_window) > 0) {
+        waiting_for_events[awaiting_list_any_window].second = std::move(cur);
+        waiting_for_events[awaiting_list_any_window].first->Signal();
+      }
+      waiting_for_events_mu->unlock();
+      // Signal the corresponding semaphore twice (for both copies).
+      ScrollView *sv = svmap[window_id];
+      if (sv != nullptr) {
+        sv->Signal();
+        sv->Signal();
+      }
+    }
+    svmap_mu->unlock();
+
+    // Wait until a new message appears in the input stream_.
+    do {
+      message = ScrollView::GetStream()->Receive();
+    } while (message == nullptr);
+  }
+}
+
+// Table to implement the color index values in the old system.
+static const uint8_t table_colors[ScrollView::GREEN_YELLOW + 1][4] = {
+    {0, 0, 0, 0},         // NONE (transparent)
+    {0, 0, 0, 255},       // BLACK.
+    {255, 255, 255, 255}, // WHITE.
+    {255, 0, 0, 255},     // RED.
+    {255, 255, 0, 255},   // YELLOW.
+    {0, 255, 0, 255},     // GREEN.
+    {0, 255, 255, 255},   // CYAN.
+    {0, 0, 255, 255},     // BLUE.
+    {255, 0, 255, 255},   // MAGENTA.
+    {0, 128, 255, 255},   // AQUAMARINE.
+    {0, 0, 64, 255},      // DARK_SLATE_BLUE.
+    {128, 128, 255, 255}, // LIGHT_BLUE.
+    {64, 64, 255, 255},   // MEDIUM_BLUE.
+    {0, 0, 32, 255},      // MIDNIGHT_BLUE.
+    {0, 0, 128, 255},     // NAVY_BLUE.
+    {192, 192, 255, 255}, // SKY_BLUE.
+    {64, 64, 128, 255},   // SLATE_BLUE.
+    {32, 32, 64, 255},    // STEEL_BLUE.
+    {255, 128, 128, 255}, // CORAL.
+    {128, 64, 0, 255},    // BROWN.
+    {128, 128, 0, 255},   // SANDY_BROWN.
+    {192, 192, 0, 255},   // GOLD.
+    {192, 192, 128, 255}, // GOLDENROD.
+    {0, 64, 0, 255},      // DARK_GREEN.
+    {32, 64, 0, 255},     // DARK_OLIVE_GREEN.
+    {64, 128, 0, 255},    // FOREST_GREEN.
+    {128, 255, 0, 255},   // LIME_GREEN.
+    {192, 255, 192, 255}, // PALE_GREEN.
+    {192, 255, 0, 255},   // YELLOW_GREEN.
+    {192, 192, 192, 255}, // LIGHT_GREY.
+    {64, 64, 128, 255},   // DARK_SLATE_GREY.
+    {64, 64, 64, 255},    // DIM_GREY.
+    {128, 128, 128, 255}, // GREY.
+    {64, 192, 0, 255},    // KHAKI.
+    {255, 0, 192, 255},   // MAROON.
+    {255, 128, 0, 255},   // ORANGE.
+    {255, 128, 64, 255},  // ORCHID.
+    {255, 192, 192, 255}, // PINK.
+    {128, 0, 128, 255},   // PLUM.
+    {255, 0, 64, 255},    // INDIAN_RED.
+    {255, 64, 0, 255},    // ORANGE_RED.
+    {255, 0, 192, 255},   // VIOLET_RED.
+    {255, 192, 128, 255}, // SALMON.
+    {128, 128, 0, 255},   // TAN.
+    {0, 255, 255, 255},   // TURQUOISE.
+    {0, 128, 128, 255},   // DARK_TURQUOISE.
+    {192, 0, 255, 255},   // VIOLET.
+    {128, 128, 0, 255},   // WHEAT.
+    {128, 255, 0, 255}    // GREEN_YELLOW
+};
+
+/*******************************************************************************
+ * Scrollview implementation.
+ *******************************************************************************/
+
+SVNetwork *ScrollView::stream_ = nullptr;
+int ScrollView::nr_created_windows_ = 0;
+int ScrollView::image_index_ = 0;
+
+/// Calls Initialize with all arguments given.
+ScrollView::ScrollView(const char *name, int x_pos, int y_pos, int x_size, int y_size,
+                       int x_canvas_size, int y_canvas_size, bool y_axis_reversed,
+                       const char *server_name) {
+  Initialize(name, x_pos, y_pos, x_size, y_size, x_canvas_size, y_canvas_size, y_axis_reversed,
+             server_name);
+}
+
+/// Calls Initialize with default argument for server_name_.
+ScrollView::ScrollView(const char *name, int x_pos, int y_pos, int x_size, int y_size,
+                       int x_canvas_size, int y_canvas_size, bool y_axis_reversed) {
+  Initialize(name, x_pos, y_pos, x_size, y_size, x_canvas_size, y_canvas_size, y_axis_reversed,
+             "localhost");
+}
+
+/// Calls Initialize with default argument for server_name_ & y_axis_reversed.
+ScrollView::ScrollView(const char *name, int x_pos, int y_pos, int x_size, int y_size,
+                       int x_canvas_size, int y_canvas_size) {
+  Initialize(name, x_pos, y_pos, x_size, y_size, x_canvas_size, y_canvas_size, false, "localhost");
+}
+
+/// Sets up a ScrollView window, depending on the constructor variables.
+void ScrollView::Initialize(const char *name, int x_pos, int y_pos, int x_size, int y_size,
+                            int x_canvas_size, int y_canvas_size, bool y_axis_reversed,
+                            const char *server_name) {
+  // If this is the first ScrollView Window which gets created, there is no
+  // network connection yet and we have to set it up in a different thread.
+  if (stream_ == nullptr) {
+    nr_created_windows_ = 0;
+    stream_ = new SVNetwork(server_name, kSvPort);
+    waiting_for_events_mu = new std::mutex();
+    svmap_mu = new std::mutex();
+    SendRawMessage("svmain = luajava.bindClass('com.google.scrollview.ScrollView')\n");
+    std::thread t(&ScrollView::MessageReceiver);
+    t.detach();
+  }
+
+  // Set up the variables on the clientside.
+  nr_created_windows_++;
+  event_handler_ = nullptr;
+  event_handler_ended_ = false;
+  y_axis_is_reversed_ = y_axis_reversed;
+  y_size_ = y_canvas_size;
+  window_name_ = name;
+  window_id_ = nr_created_windows_;
+  // Set up polygon buffering.
+  points_ = new SVPolyLineBuffer;
+  points_->empty = true;
+
+  svmap_mu->lock();
+  svmap[window_id_] = this;
+  svmap_mu->unlock();
+
+  for (auto &i : event_table_) {
+    i = nullptr;
+  }
+
+  semaphore_ = new SVSemaphore();
+
+  // Set up an actual Window on the client side.
+  char message[kMaxMsgSize];
+  snprintf(message, sizeof(message),
+           "w%d = luajava.newInstance('com.google.scrollview.ui"
+           ".SVWindow','%s',%u,%u,%u,%u,%u,%u,%u)\n",
+           window_id_, window_name_, window_id_, x_pos, y_pos, x_size, y_size, x_canvas_size,
+           y_canvas_size);
+  SendRawMessage(message);
+
+  std::thread t(&ScrollView::StartEventHandler, this);
+  t.detach();
+}
+
+/// Sits and waits for events on this window.
+void ScrollView::StartEventHandler() {
+  for (;;) {
+    stream_->Flush();
+    semaphore_->Wait();
+    int serial = -1;
+    int k = -1;
+    mutex_.lock();
+    // Check every table entry if it is valid and not already processed.
+
+    for (int i = 0; i < SVET_COUNT; i++) {
+      if (event_table_[i] != nullptr && (serial < 0 || event_table_[i]->counter < serial)) {
+        serial = event_table_[i]->counter;
+        k = i;
+      }
+    }
+    // If we didn't find anything we had an old alarm and just sleep again.
+    if (k != -1) {
+      auto new_event = std::move(event_table_[k]);
+      mutex_.unlock();
+      if (event_handler_ != nullptr) {
+        event_handler_->Notify(new_event.get());
+      }
+      if (new_event->type == SVET_DESTROY) {
+        // Signal the destructor that it is safe to terminate.
+        event_handler_ended_ = true;
+        return;
+      }
+    } else {
+      mutex_.unlock();
+    }
+    // The thread should run as long as its associated window is alive.
+  }
+}
+#endif // !GRAPHICS_DISABLED
+
+ScrollView::~ScrollView() {
+#ifndef GRAPHICS_DISABLED
+  svmap_mu->lock();
+  if (svmap[window_id_] != nullptr) {
+    svmap_mu->unlock();
+    // So the event handling thread can quit.
+    SendMsg("destroy()");
+
+    AwaitEvent(SVET_DESTROY);
+    svmap_mu->lock();
+    svmap[window_id_] = nullptr;
+    svmap_mu->unlock();
+    // The event handler thread for this window *must* receive the
+    // destroy event and set its pointer to this to nullptr before we allow
+    // the destructor to exit.
+    while (!event_handler_ended_) {
+      Update();
+    }
+  } else {
+    svmap_mu->unlock();
+  }
+  delete semaphore_;
+  delete points_;
+#endif // !GRAPHICS_DISABLED
+}
+
+#ifndef GRAPHICS_DISABLED
+/// Send a message to the server, attaching the window id.
+void ScrollView::SendMsg(const char *format, ...) {
+  if (!points_->empty) {
+    SendPolygon();
+  }
+  va_list args;
+  char message[kMaxMsgSize - 4];
+
+  va_start(args, format); // variable list
+  vsnprintf(message, sizeof(message), format, args);
+  va_end(args);
+
+  char form[kMaxMsgSize];
+  snprintf(form, sizeof(form), "w%d:%s\n", window_id_, message);
+
+  stream_->Send(form);
+}
+
+/// Send a message to the server without a
+/// window id. Used for global events like exit().
+void ScrollView::SendRawMessage(const char *msg) {
+  stream_->Send(msg);
+}
+
+/// Add an Event Listener to this ScrollView Window
+void ScrollView::AddEventHandler(SVEventHandler *listener) {
+  event_handler_ = listener;
+}
+
+void ScrollView::Signal() {
+  semaphore_->Signal();
+}
+
+void ScrollView::SetEvent(const SVEvent *svevent) {
+  // Copy event
+  auto any = svevent->copy();
+  auto specific = svevent->copy();
+  any->counter = specific->counter + 1;
+
+  // Place both events into the queue.
+  std::lock_guard<std::mutex> guard(mutex_);
+
+  event_table_[specific->type] = std::move(specific);
+  event_table_[SVET_ANY] = std::move(any);
+}
+
+/// Block until an event of the given type is received.
+/// Note: The calling function is responsible for deleting the returned
+/// SVEvent afterwards!
+std::unique_ptr<SVEvent> ScrollView::AwaitEvent(SVEventType type) {
+  // Initialize the waiting semaphore.
+  auto *sem = new SVSemaphore();
+  std::pair<ScrollView *, SVEventType> ea(this, type);
+  waiting_for_events_mu->lock();
+  waiting_for_events[ea] = {sem, nullptr};
+  waiting_for_events_mu->unlock();
+  // Wait on it, but first flush.
+  stream_->Flush();
+  sem->Wait();
+  // Process the event we got woken up for (its in waiting_for_events pair).
+  waiting_for_events_mu->lock();
+  auto ret = std::move(waiting_for_events[ea].second);
+  waiting_for_events.erase(ea);
+  delete sem;
+  waiting_for_events_mu->unlock();
+  return ret;
+}
+
+// Send the current buffered polygon (if any) and clear it.
+void ScrollView::SendPolygon() {
+  if (!points_->empty) {
+    points_->empty = true; // Allows us to use SendMsg.
+    int length = points_->xcoords.size();
+    // length == 1 corresponds to 2 SetCursors in a row and only the
+    // last setCursor has any effect.
+    if (length == 2) {
+      // An isolated line!
+      SendMsg("drawLine(%d,%d,%d,%d)", points_->xcoords[0], points_->ycoords[0],
+              points_->xcoords[1], points_->ycoords[1]);
+    } else if (length > 2) {
+      // A polyline.
+      SendMsg("createPolyline(%d)", length);
+      char coordpair[kMaxIntPairSize];
+      std::string decimal_coords;
+      for (int i = 0; i < length; ++i) {
+        snprintf(coordpair, kMaxIntPairSize, "%d,%d,", points_->xcoords[i], points_->ycoords[i]);
+        decimal_coords += coordpair;
+      }
+      decimal_coords += '\n';
+      SendRawMessage(decimal_coords.c_str());
+      SendMsg("drawPolyline()");
+    }
+    points_->xcoords.clear();
+    points_->ycoords.clear();
+  }
+}
+
+/*******************************************************************************
+ * LUA "API" functions.
+ *******************************************************************************/
+
+// Sets the position from which to draw to (x,y).
+void ScrollView::SetCursor(int x, int y) {
+  SendPolygon();
+  DrawTo(x, y);
+}
+
+// Draws from the current position to (x,y) and sets the new position to it.
+void ScrollView::DrawTo(int x, int y) {
+  points_->xcoords.push_back(x);
+  points_->ycoords.push_back(TranslateYCoordinate(y));
+  points_->empty = false;
+}
+
+// Draw a line using the current pen color.
+void ScrollView::Line(int x1, int y1, int x2, int y2) {
+  if (!points_->xcoords.empty() && x1 == points_->xcoords.back() &&
+      TranslateYCoordinate(y1) == points_->ycoords.back()) {
+    // We are already at x1, y1, so just draw to x2, y2.
+    DrawTo(x2, y2);
+  } else if (!points_->xcoords.empty() && x2 == points_->xcoords.back() &&
+             TranslateYCoordinate(y2) == points_->ycoords.back()) {
+    // We are already at x2, y2, so just draw to x1, y1.
+    DrawTo(x1, y1);
+  } else {
+    // This is a new line.
+    SetCursor(x1, y1);
+    DrawTo(x2, y2);
+  }
+}
+
+// Set the visibility of the window.
+void ScrollView::SetVisible(bool visible) {
+  if (visible) {
+    SendMsg("setVisible(true)");
+  } else {
+    SendMsg("setVisible(false)");
+  }
+}
+
+// Set the alwaysOnTop flag.
+void ScrollView::AlwaysOnTop(bool b) {
+  if (b) {
+    SendMsg("setAlwaysOnTop(true)");
+  } else {
+    SendMsg("setAlwaysOnTop(false)");
+  }
+}
+
+// Adds a message entry to the message box.
+void ScrollView::AddMessage(const char *message) {
+  char form[kMaxMsgSize];
+  snprintf(form, sizeof(form), "w%d:%s", window_id_, message);
+
+  char *esc = AddEscapeChars(form);
+  SendMsg("addMessage(\"%s\")", esc);
+  delete[] esc;
+}
+
+void ScrollView::AddMessageF(const char *format, ...) {
+  va_list args;
+  char message[kMaxMsgSize - 4];
+
+  va_start(args, format); // variable list
+  vsnprintf(message, sizeof(message), format, args);
+  va_end(args);
+
+  AddMessage(message);
+}
+
+// Set a messagebox.
+void ScrollView::AddMessageBox() {
+  SendMsg("addMessageBox()");
+}
+
+// Exit the client completely (and notify the server of it).
+void ScrollView::Exit() {
+  SendRawMessage("svmain:exit()");
+  exit(0);
+}
+
+// Clear the canvas.
+void ScrollView::Clear() {
+  SendMsg("clear()");
+}
+
+// Set the stroke width.
+void ScrollView::Stroke(float width) {
+  SendMsg("setStrokeWidth(%f)", width);
+}
+
+// Draw a rectangle using the current pen color.
+// The rectangle is filled with the current brush color.
+void ScrollView::Rectangle(int x1, int y1, int x2, int y2) {
+  if (x1 == x2 && y1 == y2) {
+    return; // Scrollviewer locks up.
+  }
+  SendMsg("drawRectangle(%d,%d,%d,%d)", x1, TranslateYCoordinate(y1), x2, TranslateYCoordinate(y2));
+}
+
+// Draw an ellipse using the current pen color.
+// The ellipse is filled with the current brush color.
+void ScrollView::Ellipse(int x1, int y1, int width, int height) {
+  SendMsg("drawEllipse(%d,%d,%u,%u)", x1, TranslateYCoordinate(y1), width, height);
+}
+
+// Set the pen color to the given RGB values.
+void ScrollView::Pen(int red, int green, int blue) {
+  SendMsg("pen(%d,%d,%d)", red, green, blue);
+}
+
+// Set the pen color to the given RGB values.
+void ScrollView::Pen(int red, int green, int blue, int alpha) {
+  SendMsg("pen(%d,%d,%d,%d)", red, green, blue, alpha);
+}
+
+// Set the brush color to the given RGB values.
+void ScrollView::Brush(int red, int green, int blue) {
+  SendMsg("brush(%d,%d,%d)", red, green, blue);
+}
+
+// Set the brush color to the given RGB values.
+void ScrollView::Brush(int red, int green, int blue, int alpha) {
+  SendMsg("brush(%d,%d,%d,%d)", red, green, blue, alpha);
+}
+
+// Set the attributes for future Text(..) calls.
+void ScrollView::TextAttributes(const char *font, int pixel_size, bool bold, bool italic,
+                                bool underlined) {
+  const char *b;
+  const char *i;
+  const char *u;
+
+  if (bold) {
+    b = "true";
+  } else {
+    b = "false";
+  }
+  if (italic) {
+    i = "true";
+  } else {
+    i = "false";
+  }
+  if (underlined) {
+    u = "true";
+  } else {
+    u = "false";
+  }
+  SendMsg("textAttributes('%s',%u,%s,%s,%s)", font, pixel_size, b, i, u);
+}
+
+// Draw text at the given coordinates.
+void ScrollView::Text(int x, int y, const char *mystring) {
+  SendMsg("drawText(%d,%d,'%s')", x, TranslateYCoordinate(y), mystring);
+}
+
+// Open and draw an image given a name at (x,y).
+void ScrollView::Draw(const char *image, int x_pos, int y_pos) {
+  SendMsg("openImage('%s')", image);
+  SendMsg("drawImage('%s',%d,%d)", image, x_pos, TranslateYCoordinate(y_pos));
+}
+
+// Add new checkboxmenuentry to menubar.
+void ScrollView::MenuItem(const char *parent, const char *name, int cmdEvent, bool flag) {
+  if (parent == nullptr) {
+    parent = "";
+  }
+  if (flag) {
+    SendMsg("addMenuBarItem('%s','%s',%d,true)", parent, name, cmdEvent);
+  } else {
+    SendMsg("addMenuBarItem('%s','%s',%d,false)", parent, name, cmdEvent);
+  }
+}
+
+// Add new menuentry to menubar.
+void ScrollView::MenuItem(const char *parent, const char *name, int cmdEvent) {
+  if (parent == nullptr) {
+    parent = "";
+  }
+  SendMsg("addMenuBarItem('%s','%s',%d)", parent, name, cmdEvent);
+}
+
+// Add new submenu to menubar.
+void ScrollView::MenuItem(const char *parent, const char *name) {
+  if (parent == nullptr) {
+    parent = "";
+  }
+  SendMsg("addMenuBarItem('%s','%s')", parent, name);
+}
+
+// Add new submenu to popupmenu.
+void ScrollView::PopupItem(const char *parent, const char *name) {
+  if (parent == nullptr) {
+    parent = "";
+  }
+  SendMsg("addPopupMenuItem('%s','%s')", parent, name);
+}
+
+// Add new submenuentry to popupmenu.
+void ScrollView::PopupItem(const char *parent, const char *name, int cmdEvent, const char *value,
+                           const char *desc) {
+  if (parent == nullptr) {
+    parent = "";
+  }
+  char *esc = AddEscapeChars(value);
+  char *esc2 = AddEscapeChars(desc);
+  SendMsg("addPopupMenuItem('%s','%s',%d,'%s','%s')", parent, name, cmdEvent, esc, esc2);
+  delete[] esc;
+  delete[] esc2;
+}
+
+// Send an update message for a single window.
+void ScrollView::UpdateWindow() {
+  SendMsg("update()");
+}
+
+// Note: this is an update to all windows
+void ScrollView::Update() {
+  std::lock_guard<std::mutex> guard(*svmap_mu);
+  for (auto &iter : svmap) {
+    if (iter.second != nullptr) {
+      iter.second->UpdateWindow();
+    }
+  }
+}
+
+// Set the pen color, using an enum value (e.g. ScrollView::ORANGE)
+void ScrollView::Pen(Color color) {
+  Pen(table_colors[color][0], table_colors[color][1], table_colors[color][2],
+      table_colors[color][3]);
+}
+
+// Set the brush color, using an enum value (e.g. ScrollView::ORANGE)
+void ScrollView::Brush(Color color) {
+  Brush(table_colors[color][0], table_colors[color][1], table_colors[color][2],
+        table_colors[color][3]);
+}
+
+// Shows a modal Input Dialog which can return any kind of String
+char *ScrollView::ShowInputDialog(const char *msg) {
+  SendMsg("showInputDialog(\"%s\")", msg);
+  // wait till an input event (all others are thrown away)
+  auto ev = AwaitEvent(SVET_INPUT);
+  char *p = new char[strlen(ev->parameter) + 1];
+  strcpy(p, ev->parameter);
+  return p;
+}
+
+// Shows a modal Yes/No Dialog which will return 'y' or 'n'
+int ScrollView::ShowYesNoDialog(const char *msg) {
+  SendMsg("showYesNoDialog(\"%s\")", msg);
+  // Wait till an input event (all others are thrown away)
+  auto ev = AwaitEvent(SVET_INPUT);
+  int a = ev->parameter[0];
+  return a;
+}
+
+// Zoom the window to the rectangle given upper left corner and
+// lower right corner.
+void ScrollView::ZoomToRectangle(int x1, int y1, int x2, int y2) {
+  y1 = TranslateYCoordinate(y1);
+  y2 = TranslateYCoordinate(y2);
+  SendMsg("zoomRectangle(%d,%d,%d,%d)", std::min(x1, x2), std::min(y1, y2), std::max(x1, x2),
+          std::max(y1, y2));
+}
+
+// Send an image of type Pix.
+void ScrollView::Draw(Image image, int x_pos, int y_pos) {
+  l_uint8 *data;
+  size_t size;
+  pixWriteMem(&data, &size, image, IFF_PNG);
+  int base64_len = (size + 2) / 3 * 4;
+  y_pos = TranslateYCoordinate(y_pos);
+  SendMsg("readImage(%d,%d,%d)", x_pos, y_pos, base64_len);
+  // Base64 encode the data.
+  const char kBase64Table[64] = {
+      'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+      'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+      'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+      'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/',
+  };
+  char *base64 = new char[base64_len + 1];
+  memset(base64, '=', base64_len);
+  base64[base64_len] = '\0';
+  int remainder = 0;
+  int bits_left = 0;
+  int code_len = 0;
+  for (size_t i = 0; i < size; ++i) {
+    int code = (data[i] >> (bits_left + 2)) | remainder;
+    base64[code_len++] = kBase64Table[code & 63];
+    bits_left += 2;
+    remainder = data[i] << (6 - bits_left);
+    if (bits_left == 6) {
+      base64[code_len++] = kBase64Table[remainder & 63];
+      bits_left = 0;
+      remainder = 0;
+    }
+  }
+  if (bits_left > 0) {
+    base64[code_len++] = kBase64Table[remainder & 63];
+  }
+  SendRawMessage(base64);
+  delete[] base64;
+  lept_free(data);
+}
+
+// Escapes the ' character with a \, so it can be processed by LUA.
+// Note: The caller will have to make sure it deletes the newly allocated item.
+char *ScrollView::AddEscapeChars(const char *input) {
+  const char *nextptr = strchr(input, '\'');
+  const char *lastptr = input;
+  char *message = new char[kMaxMsgSize];
+  int pos = 0;
+  while (nextptr != nullptr) {
+    strncpy(message + pos, lastptr, nextptr - lastptr);
+    pos += nextptr - lastptr;
+    message[pos] = '\\';
+    pos += 1;
+    lastptr = nextptr;
+    nextptr = strchr(nextptr + 1, '\'');
+  }
+  strcpy(message + pos, lastptr);
+  return message;
+}
+
+// Inverse the Y axis if the coordinates are actually inversed.
+int ScrollView::TranslateYCoordinate(int y) {
+  if (!y_axis_is_reversed_) {
+    return y;
+  } else {
+    return y_size_ - y;
+  }
+}
+
+char ScrollView::Wait() {
+  // Wait till an input or click event (all others are thrown away)
+  char ret = '\0';
+  SVEventType ev_type = SVET_ANY;
+  do {
+    std::unique_ptr<SVEvent> ev(AwaitEvent(SVET_ANY));
+    ev_type = ev->type;
+    if (ev_type == SVET_INPUT) {
+      ret = ev->parameter[0];
+    }
+  } while (ev_type != SVET_INPUT && ev_type != SVET_CLICK);
+  return ret;
+}
+
+#endif // !GRAPHICS_DISABLED
+
+} // namespace tesseract