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»ù±¾¹«Ê½£ºA  xor A = 0    A xor 0 = A   A xor A xor B  = B
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        ((A xor B) and 0xfffffff) xor B =  A xor B xor B =  A
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#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gtk/gtk.h>
static GdkPixbuf *bkpixbuf;
static GdkPixbuf *footballpixbuf;
static gboolean
on_expose_event (GtkWidget * widget,
GdkEventExpose * event, gpointer data)
{
cairo_t *cr;
cr = gdk_cairo_create (widget->window);
gdk_cairo_set_source_pixbuf(cr, bkpixbuf, 0, 0);
cairo_paint(cr);

cairo_destroy (cr);
return FALSE;
}
gboolean blttransparent(GdkPixbuf *dest, const GdkPixbuf *src, gint destx, gint desty, guint transcolor) {
GdkPixbuf *maskpixbuf = NULL; /* ÃÉ°å */
guchar *p = NULL, *dp = NULL, *sp = NULL;
gint x = 0, y = 0, i = 0;
/* ¼ì²éÄ¿µÄÇøÓò */
if(destx + gdk_pixbuf_get_width(src) >= gdk_pixbuf_get_width(dest) ||
desty + gdk_pixbuf_get_height(src) >= gdk_pixbuf_get_height(dest)) { /* ³¬³öÄ¿µÄ´óС, ʲôҲ²»×ö */
return TRUE;
}
/* ¼ì²éÑÕÉ«²ÉÑùÊý */
if(gdk_pixbuf_get_bits_per_sample(dest) != 8 ||
gdk_pixbuf_get_bits_per_sample(src) != 8) { // Ö»


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