src/cteddy.cxx

   1 // Copyright 2008 Philip Allison <sane@not.co.uk>
   2
   3 //    This file is part of cteddy.
   4 //
   5 //    cteddy is free software: you can redistribute it and/or modify
   6 //    it under the terms of the GNU General Public License as published by
   7 //    the Free Software Foundation, either version 3 of the License, or
   8 //    (at your option) any later version.
   9 //
  10 //    cteddy is distributed in the hope that it will be useful,
  11 //    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 //    GNU General Public License for more details.
  14 //
  15 //    You should have received a copy of the GNU General Public License
  16 //    along with cteddy.  If not, see <http://www.gnu.org/licenses/>.
  17
  18
  19 //
  20 // Includes
  21 //
  22
  23 // Language headers
  24 #include <string>
  25 #include <iostream>
  26
  27 // Library headers
  28 #include <gtk/gtk.h>
  29 #include <gdk/gdkkeysyms.h>
  30
  31 // System headers
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <unistd.h>
  35
  36
  37 //
  38 // Globals
  39 //
  40
  41 // Main window
  42 GtkWidget* window;
  43
  44 // GTK/GDK returned pointer
  45 GError* gerr = NULL;
  46
  47 // Image to display and its dimensions
  48 GdkPixbuf* pixbuf;
  49 gint width, height;
  50
  51
  52 //
  53 // Implementation
  54 //
  55
  56 // Re-paint the window when necessary
  57 gboolean handle_expose(GtkWidget* widget, GdkEventExpose* event)
  58 {
  59         cairo_t* cairo = gdk_cairo_create(widget->window);
  60
  61         // Blank the surface
  62         cairo_set_source_rgba (cairo, 1.0f, 1.0f, 1.0f, 0.0f);
  63         cairo_set_operator (cairo, CAIRO_OPERATOR_SOURCE);
  64         cairo_paint (cairo);
  65
  66         // Set cairo's source pattern from the desired image
  67         gdk_cairo_set_source_pixbuf(cairo, pixbuf, 0.0f, 0.0f);
  68
  69         // Draw the image
  70         cairo_rectangle(cairo, 0.0f, 0.0f,
  71                 static_cast<double>(width), static_cast<double>(height));
  72         cairo_fill(cairo);
  73
  74         cairo_destroy(cairo);
  75
  76         return false;
  77 }
  78
  79 // Handle mouse click events
  80 gboolean window_clicked(GtkWidget* widget, GdkEventButton* event)
  81 {
  82         if (event->type == GDK_BUTTON_PRESS)
  83         {
  84                 switch(event->button)
  85                 {
  86                         case 1:
  87                                 // Move the window with the left mouse button
  88                                 gtk_window_begin_move_drag(GTK_WINDOW(window),
  89                                         event->button, static_cast<gint>(event->x_root),
  90                                         static_cast<gint>(event->y_root), event->time);
  91                                 break;
  92
  93                         default:
  94                                 // Quit the app with any other
  95                                 gtk_main_quit();
  96                                 break;
  97                 }
  98         }
  99         return true;
 100 }
 101
 102 // Set up an RGBA colourmap for the window
 103 void handle_screen(GtkWidget* window, GdkScreen* old, gpointer data)
 104 {
 105         GdkScreen* s = gtk_widget_get_screen(window);
 106         GdkColormap* c = gdk_screen_get_rgba_colormap(s);
 107
 108         if (!c)
 109                 // Use standard RGB colourmap if we must. Window will have
 110                 // an ugly black border if this is the case.
 111                 c = gdk_screen_get_rgb_colormap(s);
 112
 113         gtk_widget_set_colormap(window, c);
 114 }
 115
 116 // Handle key press events
 117 void handle_key_press(GtkWidget *Window, GdkEventKey *theEvent)
 118 {
 119         switch( theEvent->keyval )
 120         {
 121                 case GDK_q:
 122                         // Quit on "q"
 123                         gtk_main_quit();
 124                         break;
 125
 126                 default:
 127                         // Ignore all other keys
 128                         break;
 129         }
 130
 131 }
 132
 133 // Entry point
 134 int main (int argc, char* argv[])
 135 {
 136         gtk_init(&argc, &argv);
 137
 138         // Whether or not the "q to quit" keybinding is disabled
 139         bool noquit = false;
 140
 141         // Whether or not to set the window's keep-on-top hint
 142         bool ontop = false;
 143
 144         // Mimic the image loading behaviour of xteddy, to an extent.
 145         {
 146                 // Start from the name of the executable itself
 147                 std::string image(argv[0]);
 148
 149                 // Take just the last component of the path
 150                 std::string::size_type s = image.find_last_of('/');
 151                 if (s != std::string::npos)
 152                         image = image.substr(s + 1);
 153
 154                 // Parse options
 155                 // XXX This code is really quick and nasty
 156                 for (int i = 1; i < argc; ++i)
 157                 {
 158                         // Allow image specification with -F<file>
 159                         if (strncmp(argv[i], "-F", 2) == 0)
 160                                 image = argv[i] + 2;
 161                         // Allow disablement of "q" keybinding
 162                         else if (strncmp(argv[i], "-noquit", 7) == 0)
 163                                 noquit = true;
 164                         // Allow keep-on-top
 165                         else if (strncmp(argv[i], "-float", 6) == 0)
 166                                 ontop = true;
 167                 }
 168
 169                 // If the given path contains slashes, assume it is absolute or
 170                 // relative to the current working directory and use it verbatim.
 171                 // Otherwise, search for it.
 172                 if (image.find_last_of('/') == std::string::npos)
 173                 {
 174                         // Append extensions one by one and search for the image
 175                         // XXX This code is really, REALLY quick and nasty
 176                         char* extensions[17];
 177                         bool found = false;
 178                         extensions[0] = '\0';
 179                         extensions[1] = ".png"; extensions[2] = ".gif"; extensions[3] = ".jpg";
 180                         extensions[4] = ".jpeg"; extensions[5] = ".pnm"; extensions[6] = ".xpm";
 181                         extensions[7] = ".tif"; extensions[8] = ".tiff";
 182                         extensions[9] = ".PNG"; extensions[10] = ".GIF"; extensions[11] = ".JPG";
 183                         extensions[12] = ".JPEG"; extensions[13] = ".PNM"; extensions[14] = ".XPM";
 184                         extensions[15] = ".TIF"; extensions[16] = ".TIFF";
 185                         for (size_t i = 0; i < 17; ++i)
 186                         {
 187                                 std::string searchimage(PKGDATADIR "/");
 188                                 searchimage.append(image);
 189                                 if (i > 0) searchimage.append(extensions[i]);
 190                                 struct stat s;
 191                                 std::cout << searchimage << std::endl;
 192                                 if (stat(searchimage.c_str(), &s) == 0)
 193                                 {
 194                                         image = searchimage;
 195                                         found = true;
 196                                         break;
 197                                 }
 198                                 // Try converting a leading x to a c
 199                                 if (image.at(0) == 'x')
 200                                 {
 201                                         std::string ximage(PKGDATADIR "/c");
 202                                         ximage.append(image.substr(1));
 203                                         if (i > 0) ximage.append(extensions[i]);
 204                                         std::cout << ximage << std::endl;
 205                                         if (stat(ximage.c_str(), &s) == 0)
 206                                         {
 207                                                 image = ximage;
 208                                                 found = true;
 209                                                 break;
 210                                         }
 211                                 }
 212                                 // Try prepending c or x
 213                                 std::string ximage(PKGDATADIR "/c");
 214                                 ximage.append(image);
 215                                 if (i > 0) ximage.append(extensions[i]);
 216                                 std::cout << ximage << std::endl;
 217                                 if (stat(ximage.c_str(), &s) == 0)
 218                                 {
 219                                         image = ximage;
 220                                         found = true;
 221                                         break;
 222                                 }
 223                                 ximage = PKGDATADIR "/x";
 224                                 ximage.append(image);
 225                                 if (i > 0) ximage.append(extensions[i]);
 226                                 std::cout << ximage << std::endl;
 227                                 if (stat(ximage.c_str(), &s) == 0)
 228                                 {
 229                                         image = ximage;
 230                                         found = true;
 231                                         break;
 232                                 }
 233                         }
 234
 235                         if (!found)
 236                         {
 237                                 std::cerr << "Cannot find image!" << std::endl;
 238                                 return 1;
 239                         }
 240                 }
 241
 242                 // Load the image from the supplied file path
 243                 pixbuf = gdk_pixbuf_new_from_file(image.c_str(), &gerr);
 244                 if (gerr)
 245                 {
 246                         std::cerr << "Cannot load image \"" << image << "\": " << gerr->message << std::endl;
 247                         g_error_free(gerr);
 248                         return 1;
 249                 }
 250         }
 251
 252         // Create the window
 253         window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 254
 255         // Top-level windows don't normally respond to mouse button events directly.
 256         // We want this one to, though.
 257         gtk_widget_add_events(window, GDK_BUTTON_PRESS_MASK);
 258
 259         // Set up event callbacks
 260         g_signal_connect(G_OBJECT(window), "expose-event", G_CALLBACK(handle_expose), NULL);
 261         g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL);
 262         g_signal_connect(G_OBJECT(window), "button-press-event", G_CALLBACK(window_clicked), NULL);
 263         g_signal_connect(G_OBJECT(window), "screen-changed", G_CALLBACK(handle_screen), NULL);
 264
 265         if (!noquit)
 266                 g_signal_connect(G_OBJECT(window), "key-press-event", G_CALLBACK(handle_key_press), NULL);
 267
 268         {
 269                 // Grap pixmap and alpha-thresholded bitmap from original pixmap
 270                 GdkPixmap* pixmap;
 271                 GdkBitmap* bitmap;
 272                 gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, &bitmap, 128);
 273
 274                 // Set window size to image size
 275                 gdk_drawable_get_size(pixmap, &width, &height);
 276                 gtk_widget_set_size_request(window, width, height);
 277
 278                 // If we have an alpha channel on the image, set the window's input shape,
 279                 // clearing it completely first
 280                 if (bitmap)
 281                 {
 282                         gtk_widget_input_shape_combine_mask(window, NULL, 0, 0);
 283                         gtk_widget_input_shape_combine_mask(window, bitmap, 0, 0);
 284                 }
 285
 286                 g_object_unref(G_OBJECT(pixmap));
 287                 g_object_unref(G_OBJECT(bitmap));
 288         }
 289
 290         // Set up various other properties we're interested in
 291         gtk_window_set_title(GTK_WINDOW(window), "cteddy");
 292         gtk_window_set_resizable(GTK_WINDOW(window), false);
 293         gtk_window_set_decorated(GTK_WINDOW(window), false);
 294         gtk_widget_set_app_paintable(window, true);
 295
 296         // Trigger initial attempt to switch to an RGBA colourmap
 297         handle_screen(window, NULL, NULL);
 298
 299         // Have to do this before we can use window->window as a GdkWindow*
 300         gtk_widget_realize(window);
 301
 302         {
 303                 // Load in the heart-shaped cursor image and use it for our window's cursor
 304                 GdkPixbuf* heart =      gdk_pixbuf_new_from_file(PKGDATADIR "/heart.png", &gerr);
 305                 if (gerr)
 306                 {
 307                         std::cerr << "Cannot load image: " << gerr->message << std::endl;
 308                         g_error_free(gerr);
 309                         return 1;
 310                 }
 311                 GdkCursor* cursor = gdk_cursor_new_from_pixbuf(gdk_display_get_default(),
 312                         heart, 12, 12);
 313                 gdk_window_set_cursor(window->window, cursor);
 314         }
 315
 316         // Clear the window's default background
 317         gdk_window_set_back_pixmap(window->window, NULL, false);
 318
 319         // Don't steal input focus when we start
 320         g_object_set(G_OBJECT(window), "focus-on-map", false, NULL);
 321
 322         if (ontop)
 323                 gtk_window_set_keep_above(window, true);
 324
 325         gtk_widget_show_all(window);
 326
 327         gtk_main();
 328
 329         return 0;
 330 }