Add powerbox hook
[gtk-with-powerbox.git] / demos / testpixbuf-scale.c
blobd512513f6ddb493ec01955d26905b16f279de4af
1 #include "config.h"
2 #include <gtk/gtk.h>
4 #include <stdio.h>
5 #include <stdlib.h>
7 GdkInterpType interp_type = GDK_INTERP_BILINEAR;
8 int overall_alpha = 255;
9 GdkPixbuf *pixbuf;
10 GtkWidget *darea;
12 void
13 set_interp_type (GtkWidget *widget, gpointer data)
15 guint types[] = { GDK_INTERP_NEAREST,
16 GDK_INTERP_BILINEAR,
17 GDK_INTERP_TILES,
18 GDK_INTERP_HYPER };
20 interp_type = types[gtk_combo_box_get_active (GTK_COMBO_BOX (widget))];
21 gtk_widget_queue_draw (darea);
24 void
25 overall_changed_cb (GtkAdjustment *adjustment, gpointer data)
27 if (adjustment->value != overall_alpha)
29 overall_alpha = adjustment->value;
30 gtk_widget_queue_draw (darea);
34 gboolean
35 expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
37 GdkPixbuf *dest;
39 gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
41 dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, event->area.width, event->area.height);
43 gdk_pixbuf_composite_color (pixbuf, dest,
44 0, 0, event->area.width, event->area.height,
45 -event->area.x, -event->area.y,
46 (double) widget->allocation.width / gdk_pixbuf_get_width (pixbuf),
47 (double) widget->allocation.height / gdk_pixbuf_get_height (pixbuf),
48 interp_type, overall_alpha,
49 event->area.x, event->area.y, 16, 0xaaaaaa, 0x555555);
51 gdk_draw_pixbuf (widget->window, widget->style->fg_gc[GTK_STATE_NORMAL], dest,
52 0, 0, event->area.x, event->area.y,
53 event->area.width, event->area.height,
54 GDK_RGB_DITHER_NORMAL, event->area.x, event->area.y);
56 g_object_unref (dest);
58 return TRUE;
61 extern void pixbuf_init();
63 int
64 main(int argc, char **argv)
66 GtkWidget *window, *vbox;
67 GtkWidget *combo_box;
68 GtkWidget *alignment;
69 GtkWidget *hbox, *label, *hscale;
70 GtkAdjustment *adjustment;
71 GtkRequisition scratch_requisition;
72 const gchar *creator;
73 GError *error;
75 pixbuf_init ();
77 gtk_init (&argc, &argv);
79 if (argc != 2) {
80 fprintf (stderr, "Usage: testpixbuf-scale FILE\n");
81 exit (1);
84 error = NULL;
85 pixbuf = gdk_pixbuf_new_from_file (argv[1], &error);
86 if (!pixbuf) {
87 fprintf (stderr, "Cannot load image: %s\n",
88 error->message);
89 g_error_free (error);
90 exit(1);
93 creator = gdk_pixbuf_get_option (pixbuf, "tEXt::Software");
94 if (creator)
95 g_print ("%s was created by '%s'\n", argv[1], creator);
97 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
98 g_signal_connect (window, "destroy",
99 G_CALLBACK (gtk_main_quit), NULL);
101 vbox = gtk_vbox_new (FALSE, 0);
102 gtk_container_add (GTK_CONTAINER (window), vbox);
104 combo_box = gtk_combo_box_new_text ();
106 gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "NEAREST");
107 gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "BILINEAR");
108 gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "TILES");
109 gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "HYPER");
111 gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 1);
113 g_signal_connect (combo_box, "changed",
114 G_CALLBACK (set_interp_type),
115 NULL);
117 alignment = gtk_alignment_new (0.0, 0.0, 0.0, 0.5);
118 gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, FALSE, 0);
120 hbox = gtk_hbox_new (FALSE, 4);
121 gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
123 label = gtk_label_new ("Overall Alpha:");
124 gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
126 adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (overall_alpha, 0, 255, 1, 10, 0));
127 g_signal_connect (adjustment, "value_changed",
128 G_CALLBACK (overall_changed_cb), NULL);
130 hscale = gtk_hscale_new (adjustment);
131 gtk_scale_set_digits (GTK_SCALE (hscale), 0);
132 gtk_box_pack_start (GTK_BOX (hbox), hscale, TRUE, TRUE, 0);
134 gtk_container_add (GTK_CONTAINER (alignment), combo_box);
135 gtk_widget_show_all (vbox);
137 /* Compute the size without the drawing area, so we know how big to make the default size */
138 gtk_widget_size_request (vbox, &scratch_requisition);
140 darea = gtk_drawing_area_new ();
141 gtk_box_pack_start (GTK_BOX (vbox), darea, TRUE, TRUE, 0);
143 g_signal_connect (darea, "expose_event",
144 G_CALLBACK (expose_cb), NULL);
146 gtk_window_set_default_size (GTK_WINDOW (window),
147 gdk_pixbuf_get_width (pixbuf),
148 scratch_requisition.height + gdk_pixbuf_get_height (pixbuf));
150 gtk_widget_show_all (window);
152 gtk_main ();
154 return 0;