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|
///////////////////////////////////////////////////////////////////////
// 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 <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*, SVEvent*> > waiting_for_events;
static std::mutex* waiting_for_events_mu;
SVEvent* SVEvent::copy() {
auto* any = 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.
auto* 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) {
cur->parameter = new char[strlen(p) + 1];
strcpy(cur->parameter, p);
if (strlen(p) > 0) { // remove the last \n
cur->parameter[strlen(p)] = '\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) { ScrollView::Exit(); }
// Place two copies of it in the table for the window.
cur->window->SetEvent(cur);
// 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 = 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 = 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 = cur;
waiting_for_events[awaiting_list_any_window].first->Signal();
} else {
// No one wanted it, so delete it.
delete cur;
}
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();
}
} else {
delete cur; // Applied to no window.
}
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;
}
mutex_ = new std::mutex();
semaphore_ = new SVSemaphore();
// Set up an actual Window on the client side.
char message[kMaxMsgSize];
snprintf(message, sizeof(message),
"w%u = 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() {
SVEvent* new_event;
for (;;) {
stream_->Flush();
semaphore_->Wait();
new_event = nullptr;
int serial = -1;
int k = -1;
mutex_->lock();
// Check every table entry if he is 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)) {
new_event = event_table_[i];
serial = event_table_[i]->counter;
k = i;
}
}
// If we didn't find anything we had an old alarm and just sleep again.
if (new_event != nullptr) {
event_table_[k] = nullptr;
mutex_->unlock();
if (event_handler_ != nullptr) { event_handler_->Notify(new_event); }
if (new_event->type == SVET_DESTROY) {
// Signal the destructor that it is safe to terminate.
event_handler_ended_ = true;
delete new_event; // Delete the pointer after it has been processed.
return;
}
delete new_event; // Delete the pointer after it has been processed.
} 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()");
SVEvent* sve = AwaitEvent(SVET_DESTROY);
delete sve;
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 mutex_;
delete semaphore_;
delete points_;
for (auto & i : event_table_) {
delete i;
}
#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%u:%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(SVEvent* svevent) {
// Copy event
SVEvent* any = svevent->copy();
SVEvent* specific = svevent->copy();
any->counter = specific->counter + 1;
// Place both events into the queue.
std::lock_guard<std::mutex> guard(*mutex_);
// Delete the old objects..
delete event_table_[specific->type];
delete event_table_[SVET_ANY];
// ...and put the new ones in the table.
event_table_[specific->type] = specific;
event_table_[SVET_ANY] = any;
}
/// Block until an event of the given type is received.
/// Note: The calling function is responsible for deleting the returned
/// SVEvent afterwards!
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] = std::pair<SVSemaphore*, SVEvent*> (sem, (SVEvent*)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();
SVEvent* ret = waiting_for_events[ea].second;
waiting_for_events.erase(ea);
delete sem;
waiting_for_events_mu->unlock();
return ret;
}
// Block until any event on any window is received.
// No event is returned here!
SVEvent* ScrollView::AwaitEventAnyWindow() {
// Initialize the waiting semaphore.
auto* sem = new SVSemaphore();
std::pair<ScrollView*, SVEventType> ea((ScrollView*)nullptr, SVET_ANY);
waiting_for_events_mu->lock();
waiting_for_events[ea] = std::pair<SVSemaphore*, SVEvent*> (sem, (SVEvent*)nullptr);
waiting_for_events_mu->unlock();
// Wait on it.
stream_->Flush();
sem->Wait();
// Process the event we got woken up for (its in waiting_for_events pair).
waiting_for_events_mu->lock();
SVEvent* ret = waiting_for_events[ea].second;
waiting_for_events.erase(ea);
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* format, ...) {
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%u:%s", window_id_, message);
char* esc = AddEscapeChars(form);
SendMsg("addMessage(\"%s\")", esc);
delete[] esc;
}
// 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::Image(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);
SVEvent* ev;
// wait till an input event (all others are thrown away)
ev = AwaitEvent(SVET_INPUT);
char* p = new char[strlen(ev->parameter) + 1];
strcpy(p, ev->parameter);
delete ev;
return p;
}
// Shows a modal Yes/No Dialog which will return 'y' or 'n'
int ScrollView::ShowYesNoDialog(const char* msg) {
SendMsg("showYesNoDialog(\"%s\")", msg);
SVEvent* ev;
// Wait till an input event (all others are thrown away)
ev = AwaitEvent(SVET_INPUT);
int a = ev->parameter[0];
delete ev;
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::Image(struct Pix* 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 he 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
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