main.cc

/*
 * A simple program to convert text input to a PNG image
 *
 * Written by Davorin Učakar <davorin.ucakar@gmail.com>
 */

#include <QApplication>
#include <QTextCodec>
#include <QPixmap>
#include <QPainter>
#include <QImage>

#include <iostream>
#include <cstdlib>
#include <cstring>

const int WIDTH     = 1024;
const int HEIGHT    = 768;
const int FONT_SIZE = 14;

int main(int argc, char** argv)
{
  QApplication app(argc, argv);
  QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));

  QStringList args = app.arguments();
  args.removeAt(0);

  for (const QString& s : args) {
    if (s[0] == '-' || s == "-?" || s == "-h" || s == "--help") {
      std::cout << "Usage: " << app.arguments()[0].data() << std::endl
                << "  Input text is read from stdin and written to `out.png'." << std::endl;

      return EXIT_FAILURE;
    }
  }

  QPixmap  pixmap(WIDTH, HEIGHT);
  QFont    font("B&H LucidaTypewriter");
  QPoint   point(0, FONT_SIZE);
  QPainter painter(&pixmap);

  pixmap.fill(Qt::black);
  font.setBold(true);
  font.setPixelSize(FONT_SIZE);
  painter.setPen(Qt::green);
  painter.setFont(font);

  char line[128];
  while (fgets(line, 128, stdin) != 0) {
    size_t len = strlen(line);

    if (len > 0 && line[len - 1] == '\n') {
      line[len - 1] = '\0';
    }

    painter.drawText(point, line);
    point.ry() += 16;
  }

  QImage image = pixmap.toImage();

  int maxX = 0;
  int maxY = 0;

  for (int x = 0; x < WIDTH; ++x) {
    for (int y = 0; y < HEIGHT; ++y) {
      if (image.pixel(x, y) & 0x00ffffff) {
        maxX = x > maxX ? x : maxX;
        maxY = y > maxY ? y : maxY;
      }
    }
  }

  QPixmap  croppedPixmap(maxX + 21, maxY + 11);
  QPainter croppedPainter(&croppedPixmap);

  croppedPixmap.fill(Qt::black);
  croppedPainter.drawPixmap(10, 0, pixmap, 0, 0, maxX + 1, maxY + 1);
  croppedPixmap.save("out.png");

  return EXIT_SUCCESS;
}