#include "config.h" #include <gtk/gtk.h> #include <stdio.h> #include <stdlib.h> GdkInterpType interp_type = GDK_INTERP_BILINEAR; int overall_alpha = 255; GdkPixbuf *pixbuf; GtkWidget *darea; void set_interp_type (GtkWidget *widget, gpointer data) { guint types[] = { GDK_INTERP_NEAREST, GDK_INTERP_BILINEAR, GDK_INTERP_TILES, GDK_INTERP_HYPER }; interp_type = types[gtk_combo_box_get_active (GTK_COMBO_BOX (widget))]; gtk_widget_queue_draw (darea); } void overall_changed_cb (GtkAdjustment *adjustment, gpointer data) { if (gtk_adjustment_get_value (adjustment) != overall_alpha) { overall_alpha = gtk_adjustment_get_value (adjustment); gtk_widget_queue_draw (darea); } } static void draw_func (GtkDrawingArea *darea, cairo_t *cr, int width, int height, gpointer data) { GdkPixbuf *dest; dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height); gdk_pixbuf_composite_color (pixbuf, dest, 0, 0, width, height, 0, 0, (double) width / gdk_pixbuf_get_width (pixbuf), (double) height / gdk_pixbuf_get_height (pixbuf), interp_type, overall_alpha, 0, 0, 16, 0xaaaaaa, 0x555555); gdk_cairo_set_source_pixbuf (cr, dest, 0, 0); cairo_paint (cr); g_object_unref (dest); } int main(int argc, char **argv) { GtkWidget *window, *vbox; GtkWidget *combo_box; GtkWidget *hbox, *label, *hscale; GtkAdjustment *adjustment; GtkRequisition scratch_requisition; const gchar *creator; GError *error; gtk_init (&argc, &argv); if (argc != 2) { fprintf (stderr, "Usage: testpixbuf-scale FILE\n"); exit (1); } error = NULL; pixbuf = gdk_pixbuf_new_from_file (argv[1], &error); if (!pixbuf) { fprintf (stderr, "Cannot load image: %s\n", error->message); g_error_free (error); exit(1); } creator = gdk_pixbuf_get_option (pixbuf, "tEXt::Software"); if (creator) g_print ("%s was created by '%s'\n", argv[1], creator); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL); vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0); gtk_container_add (GTK_CONTAINER (window), vbox); combo_box = gtk_combo_box_text_new (); gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "NEAREST"); gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "BILINEAR"); gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "TILES"); gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "HYPER"); gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 1); g_signal_connect (combo_box, "changed", G_CALLBACK (set_interp_type), NULL); gtk_widget_set_halign (combo_box, GTK_ALIGN_START); gtk_box_pack_start (GTK_BOX (vbox), combo_box, FALSE, FALSE); hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4); gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE); label = gtk_label_new ("Overall Alpha:"); gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE); adjustment = gtk_adjustment_new (overall_alpha, 0, 255, 1, 10, 0); g_signal_connect (adjustment, "value_changed", G_CALLBACK (overall_changed_cb), NULL); hscale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adjustment); gtk_scale_set_digits (GTK_SCALE (hscale), 0); gtk_box_pack_start (GTK_BOX (hbox), hscale, TRUE, TRUE); gtk_widget_show_all (vbox); /* Compute the size without the drawing area, so we know how big to make the default size */ gtk_widget_get_preferred_size ( (vbox), &scratch_requisition, NULL); darea = gtk_drawing_area_new (); gtk_box_pack_start (GTK_BOX (vbox), darea, TRUE, TRUE); gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (darea), draw_func, NULL, NULL); gtk_window_set_default_size (GTK_WINDOW (window), gdk_pixbuf_get_width (pixbuf), scratch_requisition.height + gdk_pixbuf_get_height (pixbuf)); gtk_widget_show_all (window); gtk_main (); return 0; }