mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-09-20 14:00:10 +00:00
148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
#include "config.h"
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#include <gtk/gtk.h>
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#include <stdio.h>
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#include <stdlib.h>
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GdkInterpType interp_type = GDK_INTERP_BILINEAR;
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int overall_alpha = 255;
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GdkPixbuf *pixbuf;
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GtkWidget *darea;
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void
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set_interp_type (GtkWidget *widget, gpointer data)
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{
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guint types[] = { GDK_INTERP_NEAREST,
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GDK_INTERP_BILINEAR,
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GDK_INTERP_TILES,
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GDK_INTERP_HYPER };
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interp_type = types[gtk_combo_box_get_active (GTK_COMBO_BOX (widget))];
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gtk_widget_queue_draw (darea);
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}
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void
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overall_changed_cb (GtkAdjustment *adjustment, gpointer data)
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{
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if (gtk_adjustment_get_value (adjustment) != overall_alpha)
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{
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overall_alpha = gtk_adjustment_get_value (adjustment);
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gtk_widget_queue_draw (darea);
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}
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}
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static void
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draw_func (GtkDrawingArea *darea,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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{
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GdkPixbuf *dest;
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dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
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gdk_pixbuf_composite_color (pixbuf, dest,
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0, 0, width, height,
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0, 0,
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(double) width / gdk_pixbuf_get_width (pixbuf),
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(double) height / gdk_pixbuf_get_height (pixbuf),
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interp_type, overall_alpha,
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0, 0, 16, 0xaaaaaa, 0x555555);
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gdk_cairo_set_source_pixbuf (cr, dest, 0, 0);
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cairo_paint (cr);
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g_object_unref (dest);
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}
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int
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main(int argc, char **argv)
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{
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GtkWidget *window, *vbox;
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GtkWidget *combo_box;
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GtkWidget *hbox, *label, *hscale;
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GtkAdjustment *adjustment;
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GtkRequisition scratch_requisition;
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const gchar *creator;
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GError *error;
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gtk_init ();
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if (argc != 2) {
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fprintf (stderr, "Usage: testpixbuf-scale FILE\n");
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exit (1);
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}
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error = NULL;
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pixbuf = gdk_pixbuf_new_from_file (argv[1], &error);
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if (!pixbuf) {
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fprintf (stderr, "Cannot load image: %s\n",
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error->message);
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g_error_free (error);
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exit(1);
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}
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creator = gdk_pixbuf_get_option (pixbuf, "tEXt::Software");
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if (creator)
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g_print ("%s was created by '%s'\n", argv[1], creator);
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_main_quit), NULL);
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vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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combo_box = gtk_combo_box_text_new ();
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gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "NEAREST");
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gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "BILINEAR");
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gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "TILES");
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gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), "HYPER");
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gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 1);
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g_signal_connect (combo_box, "changed",
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G_CALLBACK (set_interp_type),
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NULL);
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gtk_widget_set_halign (combo_box, GTK_ALIGN_START);
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gtk_container_add (GTK_CONTAINER (vbox), combo_box);
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hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
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gtk_container_add (GTK_CONTAINER (vbox), hbox);
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label = gtk_label_new ("Overall Alpha:");
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gtk_container_add (GTK_CONTAINER (hbox), label);
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adjustment = gtk_adjustment_new (overall_alpha, 0, 255, 1, 10, 0);
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g_signal_connect (adjustment, "value_changed",
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G_CALLBACK (overall_changed_cb), NULL);
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hscale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adjustment);
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gtk_scale_set_digits (GTK_SCALE (hscale), 0);
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gtk_widget_set_hexpand (hscale, TRUE);
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gtk_container_add (GTK_CONTAINER (hbox), hscale);
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/* Compute the size without the drawing area, so we know how big to make the default size */
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gtk_widget_get_preferred_size ( (vbox),
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&scratch_requisition, NULL);
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darea = gtk_drawing_area_new ();
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gtk_widget_set_hexpand (darea, TRUE);
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gtk_container_add (GTK_CONTAINER (vbox), darea);
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (darea), draw_func, NULL, NULL);
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gtk_window_set_default_size (GTK_WINDOW (window),
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gdk_pixbuf_get_width (pixbuf),
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scratch_requisition.height + gdk_pixbuf_get_height (pixbuf));
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gtk_widget_show (window);
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gtk_main ();
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return 0;
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}
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