7 GdkInterpType interp_type = GDK_INTERP_BILINEAR;
8 int overall_alpha = 255;
13 set_interp_type (GtkWidget *widget, gpointer data)
15 guint types[] = { GDK_INTERP_NEAREST,
20 interp_type = types[gtk_combo_box_get_active (GTK_COMBO_BOX (widget))];
21 gtk_widget_queue_draw (darea);
25 overall_changed_cb (GtkAdjustment *adjustment, gpointer data)
27 if (gtk_adjustment_get_value (adjustment) != overall_alpha)
29 overall_alpha = gtk_adjustment_get_value (adjustment);
30 gtk_widget_queue_draw (darea);
35 draw_cb (GtkWidget *widget, cairo_t *cr, gpointer data)
40 width = gtk_widget_get_allocated_width (widget);
41 height = gtk_widget_get_allocated_height (widget);
43 dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
45 gdk_pixbuf_composite_color (pixbuf, dest,
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);
53 gdk_cairo_set_source_pixbuf (cr, dest, 0, 0);
56 g_object_unref (dest);
62 main(int argc, char **argv)
64 GtkWidget *window, *vbox;
67 GtkWidget *hbox, *label, *hscale;
68 GtkAdjustment *adjustment;
69 GtkRequisition scratch_requisition;
73 gtk_init (&argc, &argv);
76 fprintf (stderr, "Usage: testpixbuf-scale FILE\n");
81 pixbuf = gdk_pixbuf_new_from_file (argv[1], &error);
83 fprintf (stderr, "Cannot load image: %s\n",
89 creator = gdk_pixbuf_get_option (pixbuf, "tEXt::Software");
91 g_print ("%s was created by '%s'\n", argv[1], creator);
93 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
94 g_signal_connect (window, "destroy",
95 G_CALLBACK (gtk_main_quit), NULL);
97 vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
98 gtk_container_add (GTK_CONTAINER (window), vbox);
100 combo_box = gtk_combo_box_text_new ();
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");
107 gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 1);
109 g_signal_connect (combo_box, "changed",
110 G_CALLBACK (set_interp_type),
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);
116 hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
117 gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
119 label = gtk_label_new ("Overall Alpha:");
120 gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
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);
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);
130 gtk_container_add (GTK_CONTAINER (alignment), combo_box);
131 gtk_widget_show_all (vbox);
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);
137 darea = gtk_drawing_area_new ();
138 gtk_box_pack_start (GTK_BOX (vbox), darea, TRUE, TRUE, 0);
140 g_signal_connect (darea, "draw",
141 G_CALLBACK (draw_cb), NULL);
143 gtk_window_set_default_size (GTK_WINDOW (window),
144 gdk_pixbuf_get_width (pixbuf),
145 scratch_requisition.height + gdk_pixbuf_get_height (pixbuf));
147 gtk_widget_show_all (window);