testpixbuf-scale.c 4.65 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
#include <gtk/gtk.h>
#include "gdk-pixbuf.h"

#include <stdio.h>

ArtFilterLevel filter_level = ART_FILTER_BILINEAR;
int overall_alpha = 255;
GdkPixbuf *pixbuf;
GtkWidget *darea;
  
void
set_filter_level (GtkWidget *widget, gpointer data)
{
  filter_level = GPOINTER_TO_UINT (data);
  gtk_widget_queue_draw (darea);
}

void
overall_changed_cb (GtkAdjustment *adjustment, gpointer data)
{
  if (adjustment->value != overall_alpha)
    {
      overall_alpha = adjustment->value;
      gtk_widget_queue_draw (darea);
    }
}

gboolean
expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
  GdkPixbuf *dest;

33 34
  gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
  
35 36
  dest = gdk_pixbuf_new (ART_PIX_RGB, FALSE, 8, event->area.width, event->area.height);

37 38 39 40 41 42 43
  gdk_pixbuf_composite_color (pixbuf, dest,
			      0, 0, event->area.width, event->area.height,
			      -event->area.x, -event->area.y,
			      (double) widget->allocation.width / pixbuf->art_pixbuf->width,
			      (double) widget->allocation.height / pixbuf->art_pixbuf->height,
			      filter_level, overall_alpha,
			      event->area.x, event->area.y, 16, 0xaaaaaa, 0x555555);
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156

  gdk_pixbuf_render_to_drawable (dest, widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
				 0, 0, event->area.x, event->area.y,
				 event->area.width, event->area.height,
				 GDK_RGB_DITHER_NORMAL, event->area.x, event->area.y);
  
  gdk_pixbuf_unref (dest);
  
  return TRUE;
}

int
main(int argc, char **argv)
{
	GtkWidget *window, *vbox;
	GtkWidget *menuitem, *optionmenu, *menu;
	GtkWidget *alignment;
	GtkWidget *hbox, *label, *hscale;
	GtkAdjustment *adjustment;
	GtkRequisition scratch_requisition;

	gtk_init (&argc, &argv);
	gdk_rgb_init ();

	if (argc != 2) {
		fprintf (stderr, "Usage: testpixbuf-scale FILE\n");
		exit (1);
	}

	pixbuf = gdk_pixbuf_new_from_file (argv[1]);
	if (!pixbuf) {
		fprintf (stderr, "Cannot load %s\n", argv[1]);
		exit(1);
	}

	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	gtk_signal_connect (GTK_OBJECT (window), "destroy",
			    GTK_SIGNAL_FUNC (gtk_main_quit), NULL);
	
	vbox = gtk_vbox_new (FALSE, 0);
	gtk_container_add (GTK_CONTAINER (window), vbox);

	menu = gtk_menu_new ();
	
	menuitem = gtk_menu_item_new_with_label ("NEAREST");
	gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
			    GTK_SIGNAL_FUNC (set_filter_level),
			    GUINT_TO_POINTER (ART_FILTER_NEAREST));
	gtk_widget_show (menuitem);
	gtk_container_add (GTK_CONTAINER (menu), menuitem);
	
	menuitem = gtk_menu_item_new_with_label ("BILINEAR");
	gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
			    GTK_SIGNAL_FUNC (set_filter_level),
			    GUINT_TO_POINTER (ART_FILTER_BILINEAR));
	gtk_widget_show (menuitem);
	gtk_container_add (GTK_CONTAINER (menu), menuitem);
	
	menuitem = gtk_menu_item_new_with_label ("TILES");
	gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
			    GTK_SIGNAL_FUNC (set_filter_level),
			    GUINT_TO_POINTER (ART_FILTER_TILES));
	gtk_container_add (GTK_CONTAINER (menu), menuitem);

	menuitem = gtk_menu_item_new_with_label ("HYPER");
	gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
			    GTK_SIGNAL_FUNC (set_filter_level),
			    GUINT_TO_POINTER (ART_FILTER_HYPER));
	gtk_container_add (GTK_CONTAINER (menu), menuitem);

	optionmenu = gtk_option_menu_new ();
	gtk_option_menu_set_menu (GTK_OPTION_MENU (optionmenu), menu);
	gtk_option_menu_set_history (GTK_OPTION_MENU (optionmenu), 1);
	
	alignment = gtk_alignment_new (0.0, 0.0, 0.0, 0.5);
	gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, FALSE, 0);

	hbox = gtk_hbox_new (FALSE, 4);
	gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

	label = gtk_label_new ("Overall Alpha:");
	gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

	adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (overall_alpha, 0, 255, 1, 10, 0));
	gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
			    GTK_SIGNAL_FUNC (overall_changed_cb), NULL);
	
	hscale = gtk_hscale_new (adjustment);
	gtk_scale_set_digits (GTK_SCALE (hscale), 0);
	gtk_box_pack_start (GTK_BOX (hbox), hscale, TRUE, TRUE, 0);

	gtk_container_add (GTK_CONTAINER (alignment), optionmenu);
	gtk_widget_show_all (vbox);

	/* Compute the size without the drawing area, so we know how big to make the default size */
	gtk_widget_size_request (vbox, &scratch_requisition);

	darea = gtk_drawing_area_new ();
	gtk_box_pack_start (GTK_BOX (vbox), darea, TRUE, TRUE, 0);

	gtk_signal_connect (GTK_OBJECT (darea), "expose_event",
			    GTK_SIGNAL_FUNC (expose_cb), NULL);

	gtk_window_set_default_size (GTK_WINDOW (window),
				     pixbuf->art_pixbuf->width,
				     scratch_requisition.height + pixbuf->art_pixbuf->height);
	
	gtk_widget_show_all (window);

	gtk_main ();

	return 0;
}