Pileus Git - ~andy/gtk/blob - tests/testpixbuf-scale.c

   1 #include "config.h"
   2 #include <gtk/gtk.h>
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6
   7 GdkInterpType interp_type = GDK_INTERP_BILINEAR;
   8 int overall_alpha = 255;
   9 GdkPixbuf *pixbuf;
  10 GtkWidget *darea;
  11
  12 void
  13 set_interp_type (GtkWidget *widget, gpointer data)
  14 {
  15   guint types[] = { GDK_INTERP_NEAREST,
  16                     GDK_INTERP_BILINEAR,
  17                     GDK_INTERP_TILES,
  18                     GDK_INTERP_HYPER };
  19
  20   interp_type = types[gtk_combo_box_get_active (GTK_COMBO_BOX (widget))];
  21   gtk_widget_queue_draw (darea);
  22 }
  23
  24 void
  25 overall_changed_cb (GtkAdjustment *adjustment, gpointer data)
  26 {
  27   if (gtk_adjustment_get_value (adjustment) != overall_alpha)
  28     {
  29       overall_alpha = gtk_adjustment_get_value (adjustment);
  30       gtk_widget_queue_draw (darea);
  31     }
  32 }
  33
  34 gboolean
  35 draw_cb (GtkWidget *widget, cairo_t *cr, gpointer data)
  36 {
  37   GdkPixbuf *dest;
  38   int width, height;
  39
  40   width = gtk_widget_get_allocated_width (widget);
  41   height = gtk_widget_get_allocated_height (widget);
  42
  43   dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
  44
  45   gdk_pixbuf_composite_color (pixbuf, dest,
  46                               0, 0, width, height,
  47                               0, 0,
  48                               (double) width / gdk_pixbuf_get_width (pixbuf),
  49                               (double) height / gdk_pixbuf_get_height (pixbuf),
  50                               interp_type, overall_alpha,
  51                               0, 0, 16, 0xaaaaaa, 0x555555);
  52
  53   gdk_cairo_set_source_pixbuf (cr, dest, 0, 0);
  54   cairo_paint (cr);
  55
  56   g_object_unref (dest);
  57
  58   return TRUE;
  59 }
  60
  61 int
  62 main(int argc, char **argv)
  63 {
  64         GtkWidget *window, *vbox;
  65         GtkWidget *combo_box;
  66         GtkWidget *alignment;
  67         GtkWidget *hbox, *label, *hscale;
  68         GtkAdjustment *adjustment;
  69         GtkRequisition scratch_requisition;
  70         const gchar *creator;
  71         GError *error;
  72
  73         gtk_init (&argc, &argv);
  74
  75         if (argc != 2) {
  76                 fprintf (stderr, "Usage: testpixbuf-scale FILE\n");
  77                 exit (1);
  78         }
  79
  80         error = NULL;
  81         pixbuf = gdk_pixbuf_new_from_file (argv[1], &error);
  82         if (!pixbuf) {
  83                 fprintf (stderr, "Cannot load image: %s\n",
  84                          error->message);
  85                 g_error_free (error);
  86                 exit(1);
  87         }
  88
  89         creator = gdk_pixbuf_get_option (pixbuf, "tEXt::Software");
  90         if (creator)
  91                 g_print ("%s was created by '%s'\n", argv[1], creator);
  92
  93         window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  94         g_signal_connect (window, "destroy",
  95                           G_CALLBACK (gtk_main_quit), NULL);
  96
  97         vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
  98         gtk_container_add (GTK_CONTAINER (window), vbox);
  99
 100         combo_box = gtk_combo_box_text_new ();
 101
 102         gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "NEAREST");
 103         gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "BILINEAR");
 104         gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "TILES");
 105         gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "HYPER");
 106
 107         gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 1);
 108
 109         g_signal_connect (combo_box, "changed",
 110                           G_CALLBACK (set_interp_type),
 111                           NULL);
 112
 113         alignment = gtk_alignment_new (0.0, 0.0, 0.0, 0.5);
 114         gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, FALSE, 0);
 115
 116         hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
 117         gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
 118
 119         label = gtk_label_new ("Overall Alpha:");
 120         gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
 121
 122         adjustment = gtk_adjustment_new (overall_alpha, 0, 255, 1, 10, 0);
 123         g_signal_connect (adjustment, "value_changed",
 124                           G_CALLBACK (overall_changed_cb), NULL);
 125
 126         hscale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adjustment);
 127         gtk_scale_set_digits (GTK_SCALE (hscale), 0);
 128         gtk_box_pack_start (GTK_BOX (hbox), hscale, TRUE, TRUE, 0);
 129
 130         gtk_container_add (GTK_CONTAINER (alignment), combo_box);
 131         gtk_widget_show_all (vbox);
 132
 133         /* Compute the size without the drawing area, so we know how big to make the default size */
 134         gtk_widget_get_preferred_size ( (vbox),
 135                                    &scratch_requisition, NULL);
 136
 137         darea = gtk_drawing_area_new ();
 138         gtk_box_pack_start (GTK_BOX (vbox), darea, TRUE, TRUE, 0);
 139
 140         g_signal_connect (darea, "draw",
 141                           G_CALLBACK (draw_cb), NULL);
 142
 143         gtk_window_set_default_size (GTK_WINDOW (window),
 144                                      gdk_pixbuf_get_width (pixbuf),
 145                                      scratch_requisition.height + gdk_pixbuf_get_height (pixbuf));
 146
 147         gtk_widget_show_all (window);
 148
 149         gtk_main ();
 150
 151         return 0;
 152 }