Pileus Git - ~andy/gtk/blob - demos/testpixbuf-drawable.c

   1 #include <gtk/gtk.h>
   2 #include <gdk/gdkx.h>
   3 #include <gdk-pixbuf/gdk-pixbuf.h>
   4 #include <gdk-pixbuf/gdk-pixbuf-drawable.h>
   5
   6 void close_app(GtkWidget *widget, gpointer data)
   7 {
   8    gtk_main_quit();
   9 }
  10
  11 void expose_cb(GtkWidget *drawing_area, GdkEventExpose *evt, gpointer
  12 data)
  13 {
  14    GdkPixbuf *pixbuf;
  15    gint x1, y1, x2, y2;
  16
  17    pixbuf = (GdkPixbuf *) gtk_object_get_data(GTK_OBJECT(drawing_area),
  18                                               "pixbuf");
  19
  20    if(pixbuf->art_pixbuf->has_alpha)
  21    {
  22       gdk_draw_rgb_32_image(drawing_area->window,
  23                             drawing_area->style->black_gc,
  24                             evt->area.x, evt->area.y,
  25                             evt->area.width,
  26                             evt->area.height,
  27                             GDK_RGB_DITHER_MAX,
  28                             pixbuf->art_pixbuf->pixels +
  29                               (evt->area.y * pixbuf->art_pixbuf->rowstride) +
  30                               (evt->area.x *  pixbuf->art_pixbuf->n_channels),
  31                             pixbuf->art_pixbuf->rowstride);
  32    }
  33    else
  34    {
  35       gdk_draw_rgb_image(drawing_area->window,
  36                          drawing_area->style->white_gc,
  37                          evt->area.x, evt->area.y,
  38                          evt->area.width,
  39                          evt->area.height,
  40                          GDK_RGB_DITHER_NORMAL,
  41                          pixbuf->art_pixbuf->pixels +
  42                            (evt->area.y * pixbuf->art_pixbuf->rowstride) +
  43                            (evt->area.x * pixbuf->art_pixbuf->n_channels),
  44                          pixbuf->art_pixbuf->rowstride);
  45    }
  46 }
  47 void configure_cb(GtkWidget *drawing_area, GdkEventConfigure *evt,
  48 gpointer data)
  49 {
  50    GdkPixbuf *pixbuf, spb;
  51
  52    pixbuf = (GdkPixbuf *) gtk_object_get_data(GTK_OBJECT(drawing_area),
  53                                               "pixbuf");
  54
  55    g_print("X:%d Y:%d\n", evt->width, evt->height);
  56 #if 0
  57    if(((evt->width) != (pixbuf->art_pixbuf->width)) ||
  58       ((evt->height) != (pixbuf->art_pixbuf->height)))
  59       gdk_pixbuf_scale(pixbuf, evt->width, evt->height);
  60 #endif
  61 }
  62
  63 int main(int argc, char **argv)
  64 {
  65    GdkWindow     *root;
  66    GtkWidget     *window;
  67    GtkWidget     *vbox;
  68    GtkWidget     *drawing_area;
  69    GdkPixbuf     *pixbuf;
  70    gint           width, height;
  71    gint           x, y;
  72
  73    gtk_init(&argc, &argv);
  74    gdk_rgb_set_verbose(TRUE);
  75    gdk_rgb_init();
  76
  77    gtk_widget_set_default_colormap(gdk_rgb_get_cmap());
  78    gtk_widget_set_default_visual(gdk_rgb_get_visual());
  79
  80    root = gdk_window_foreign_new(GDK_ROOT_WINDOW());
  81    pixbuf = gdk_pixbuf_rgb_from_drawable(root, 0, 0, 150, 160);
  82
  83    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  84    gtk_signal_connect(GTK_OBJECT(window), "delete_event",
  85                       GTK_SIGNAL_FUNC(close_app), NULL);
  86    gtk_signal_connect(GTK_OBJECT(window), "destroy",
  87
  88                       GTK_SIGNAL_FUNC(close_app), NULL);
  89
  90    vbox = gtk_vbox_new(FALSE, 0);
  91    gtk_container_add(GTK_CONTAINER(window), vbox);
  92
  93    drawing_area = gtk_drawing_area_new();
  94    gtk_drawing_area_size(GTK_DRAWING_AREA(drawing_area),
  95                          pixbuf->art_pixbuf->width,
  96                          pixbuf->art_pixbuf->height);
  97    gtk_signal_connect(GTK_OBJECT(drawing_area), "expose_event",
  98                       GTK_SIGNAL_FUNC(expose_cb), NULL);
  99
 100    gtk_signal_connect(GTK_OBJECT(drawing_area), "configure_event",
 101                       GTK_SIGNAL_FUNC(configure_cb), NULL);
 102    gtk_object_set_data(GTK_OBJECT(drawing_area), "pixbuf", pixbuf);
 103    gtk_box_pack_start(GTK_BOX(vbox), drawing_area, TRUE, TRUE, 0);
 104
 105    gtk_widget_show_all(window);
 106    gtk_main();
 107 }