Directory full of pixel data scaling code that will eventually migrate
2000-01-05 Owen Taylor <otaylor@redhat.com> * gdk-pixbuf/pixops/: Directory full of pixel data scaling code that will eventually migrate into libart. * configure.in acconfig.h: Add checks for MMX compiler support * gdk-pixbuf/gdk-pixbuf.h gdk-pixbuf/gdk-pixbuf-scale.c: Nice wrapper routines for the code in pixops that operate on pixbufs instead of raw data. * gdk-pixbuf/testpixbuf-scale: Test program for scaling routines.
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Owen Taylor
163
demos/testpixbuf-scale.c
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163
demos/testpixbuf-scale.c
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#include <gtk/gtk.h>
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#include "gdk-pixbuf.h"
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#include <stdio.h>
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ArtFilterLevel filter_level = ART_FILTER_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_filter_level (GtkWidget *widget, gpointer data)
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{
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filter_level = GPOINTER_TO_UINT (data);
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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 (adjustment->value != overall_alpha)
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{
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overall_alpha = adjustment->value;
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gtk_widget_queue_draw (darea);
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}
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}
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gboolean
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expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
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{
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GdkPixbuf *dest;
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dest = gdk_pixbuf_new (ART_PIX_RGB, FALSE, 8, event->area.width, event->area.height);
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if (pixbuf->art_pixbuf->has_alpha || overall_alpha != 255)
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gdk_pixbuf_composite_color (pixbuf, dest,
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0, 0, event->area.width, event->area.height,
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-event->area.x, -event->area.y,
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(double) widget->allocation.width / pixbuf->art_pixbuf->width,
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(double) widget->allocation.height / pixbuf->art_pixbuf->height,
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filter_level, overall_alpha,
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event->area.x, event->area.y, 16, 0xaaaaaa, 0x555555);
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else
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gdk_pixbuf_scale (pixbuf, dest,
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0, 0, event->area.width, event->area.height,
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-event->area.x, -event->area.y,
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(double) widget->allocation.width / pixbuf->art_pixbuf->width,
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(double) widget->allocation.height / pixbuf->art_pixbuf->height,
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filter_level);
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gdk_pixbuf_render_to_drawable (dest, widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
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0, 0, event->area.x, event->area.y,
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event->area.width, event->area.height,
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GDK_RGB_DITHER_NORMAL, event->area.x, event->area.y);
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gdk_pixbuf_unref (dest);
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return TRUE;
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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 *menuitem, *optionmenu, *menu;
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GtkWidget *alignment;
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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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gtk_init (&argc, &argv);
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gdk_rgb_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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pixbuf = gdk_pixbuf_new_from_file (argv[1]);
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if (!pixbuf) {
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fprintf (stderr, "Cannot load %s\n", argv[1]);
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exit(1);
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}
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_signal_connect (GTK_OBJECT (window), "destroy",
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GTK_SIGNAL_FUNC (gtk_main_quit), NULL);
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vbox = gtk_vbox_new (FALSE, 0);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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menu = gtk_menu_new ();
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menuitem = gtk_menu_item_new_with_label ("NEAREST");
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gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
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GTK_SIGNAL_FUNC (set_filter_level),
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GUINT_TO_POINTER (ART_FILTER_NEAREST));
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gtk_widget_show (menuitem);
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gtk_container_add (GTK_CONTAINER (menu), menuitem);
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menuitem = gtk_menu_item_new_with_label ("BILINEAR");
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gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
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GTK_SIGNAL_FUNC (set_filter_level),
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GUINT_TO_POINTER (ART_FILTER_BILINEAR));
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gtk_widget_show (menuitem);
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gtk_container_add (GTK_CONTAINER (menu), menuitem);
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menuitem = gtk_menu_item_new_with_label ("TILES");
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gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
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GTK_SIGNAL_FUNC (set_filter_level),
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GUINT_TO_POINTER (ART_FILTER_TILES));
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gtk_container_add (GTK_CONTAINER (menu), menuitem);
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menuitem = gtk_menu_item_new_with_label ("HYPER");
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gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
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GTK_SIGNAL_FUNC (set_filter_level),
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GUINT_TO_POINTER (ART_FILTER_HYPER));
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gtk_container_add (GTK_CONTAINER (menu), menuitem);
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optionmenu = gtk_option_menu_new ();
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gtk_option_menu_set_menu (GTK_OPTION_MENU (optionmenu), menu);
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gtk_option_menu_set_history (GTK_OPTION_MENU (optionmenu), 1);
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alignment = gtk_alignment_new (0.0, 0.0, 0.0, 0.5);
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gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, FALSE, 0);
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hbox = gtk_hbox_new (FALSE, 4);
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gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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label = gtk_label_new ("Overall Alpha:");
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gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
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adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (overall_alpha, 0, 255, 1, 10, 0));
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gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
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GTK_SIGNAL_FUNC (overall_changed_cb), NULL);
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hscale = gtk_hscale_new (adjustment);
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gtk_scale_set_digits (GTK_SCALE (hscale), 0);
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gtk_box_pack_start (GTK_BOX (hbox), hscale, TRUE, TRUE, 0);
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gtk_container_add (GTK_CONTAINER (alignment), optionmenu);
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gtk_widget_show_all (vbox);
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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_size_request (vbox, &scratch_requisition);
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darea = gtk_drawing_area_new ();
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gtk_box_pack_start (GTK_BOX (vbox), darea, TRUE, TRUE, 0);
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gtk_signal_connect (GTK_OBJECT (darea), "expose_event",
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GTK_SIGNAL_FUNC (expose_cb), NULL);
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gtk_window_set_default_size (GTK_WINDOW (window),
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pixbuf->art_pixbuf->width,
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scratch_requisition.height + pixbuf->art_pixbuf->height);
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gtk_widget_show_all (window);
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gtk_main ();
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return 0;
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}
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