/* File: animation.c */	//Note: this program need gdk-pixbuf extension	//code from mzdic	#include <gtk/gtk.h>	#include <gdk-pixbuf/gdk-pixbuf.h>	static int draw_frame(GtkWidget *w);	static void initialize_animation(GtkWidget *w);	static int width, height;	static GList *current_frame_list;	static GdkPixbufAnimation *ani;	static guint animation_id = 0;	static char * animation_filename;	static GdkPixmap *pixmap, *clean_pixmap;	static void start_animation(GtkWidget *w)	{		if (ani == NULL) initialize_animation(w);		draw_frame(w);	}	static void stop_animation(GtkWidget *w)	{		if (animation_id) {			gtk_timeout_remove(animation_id);			animation_id = 0;		}	}	static void destroy_animation(GtkWidget *w)	{		if (animation_id) {			gtk_timeout_remove(animation_id);			animation_id = 0;		}		gdk_pixbuf_animation_unref(ani);		gdk_pixmap_unref(pixmap); 		gdk_pixmap_unref(clean_pixmap);		ani = NULL;		g_free(animation_filename);	}	static int draw_frame(GtkWidget *w)	{		int offset_x, offset_y;		int margin_x, margin_y;		GdkPixbufFrame *frame;		GdkPixbuf *pix;		if (!GTK_WIDGET_REALIZED(w)) return FALSE;		frame = current_frame_list->data;		pix = gdk_pixbuf_frame_get_pixbuf(frame);		offset_x = gdk_pixbuf_frame_get_x_offset(frame);		offset_y = gdk_pixbuf_frame_get_y_offset(frame);		margin_x = (w->allocation.width - width)/2;		margin_y = (w->allocation.height - height)/2;		gdk_window_copy_area(pixmap, w->style->black_gc,		    0, 0, clean_pixmap, 0, 0, width, height);		gdk_pixbuf_render_to_drawable_alpha(pix, pixmap,			0, 0, offset_x, offset_y,			gdk_pixbuf_get_width(pix), gdk_pixbuf_get_height(pix),			GDK_PIXBUF_ALPHA_BILEVEL, 128,			GDK_RGB_DITHER_NONE, 0, 0);		gdk_window_copy_area(w->window, w->style->black_gc, 			margin_x, margin_y, pixmap, 0, 0, width, height);		animation_id = gtk_timeout_add(			10*gdk_pixbuf_frame_get_delay_time(frame),			(GtkFunction)draw_frame, w);		current_frame_list = current_frame_list->next;		if (current_frame_list == NULL) 			current_frame_list = 				gdk_pixbuf_animation_get_frames(ani);		return FALSE;	}	static void initialize_animation(GtkWidget *w)	{		if (ani) return;		ani = gdk_pixbuf_animation_new_from_file(animation_filename);		if (ani == NULL) return;		width = gdk_pixbuf_animation_get_width(ani);		height = gdk_pixbuf_animation_get_height(ani);		current_frame_list = gdk_pixbuf_animation_get_frames(ani);		pixmap = gdk_pixmap_new(w->window, width, height, -1);		clean_pixmap = gdk_pixmap_new(w->window, width, height, -1);		if (w->style->bg_pixmap[GTK_STATE_NORMAL]) {			GdkPixmap *bg = w->style->bg_pixmap[GTK_STATE_NORMAL];			GdkGC *gc;			GdkGCValues values;			values.tile = bg;			values.fill = GDK_TILED;			gc = gdk_gc_new_with_values(w->window, &values, 				GDK_GC_FILL|GDK_GC_TILE);			gdk_gc_set_ts_origin(gc, 				(w->allocation.width - width)/2, 				(w->allocation.height-height)/2);			gdk_draw_rectangle(clean_pixmap,gc, TRUE, 				0, 0, width, height);			gdk_gc_destroy(gc);		} else {			gdk_draw_rectangle(clean_pixmap, 				w->style->bg_gc[GTK_STATE_NORMAL], 				TRUE, 0, 0, width, height);		}	}	GtkWidget *animation_new(char *filename)	{		GtkWidget *w;		animation_filename = g_strdup(filename);		w = gtk_drawing_area_new();		gtk_signal_connect(GTK_OBJECT(w), "realize",			GTK_SIGNAL_FUNC(start_animation), NULL);		gtk_signal_connect(GTK_OBJECT(w), "show",			GTK_SIGNAL_FUNC(draw_frame), NULL);		gtk_signal_connect(GTK_OBJECT(w), "hide",			GTK_SIGNAL_FUNC(stop_animation), NULL);		gtk_signal_connect(GTK_OBJECT(w), "destroy",			GTK_SIGNAL_FUNC(destroy_animation), NULL);		return w;	}	int main(int argc, char *argv[])	{		GtkWidget *window;		GtkWidget *penguin;		//初始化		gtk_set_locale();		gtk_init(&argc, &argv);		//gdk_rgb_set_verbose(TRUE);		gdk_rgb_init();		gtk_widget_set_default_colormap(gdk_rgb_get_cmap());		gtk_widget_set_default_visual(gdk_rgb_get_visual());		//建立窗口		window = gtk_window_new(GTK_WINDOW_TOPLEVEL);		gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);		gtk_window_set_title(GTK_WINDOW(window), "動畫");		gtk_signal_connect(GTK_OBJECT(window), "destroy",			GTK_SIGNAL_FUNC(gtk_main_quit), NULL);		if(argc > 1) penguin = animation_new(argv[1]);		else penguin = animation_new("./penguin.gif");		gtk_container_add(GTK_CONTAINER(window), penguin);		gtk_widget_show_all(window);		gtk_main();		return 0;	}