#!/usr/bin/env python
## Copyright (c) Valek Filippov, 2007
## License: GPL v3.
import sys
import gtk
import cairo
import math
import array

##    data = array.array('b','\x80'*8) 			                                   #vertlines |
##    data = array.array('b','\xff\x00\x00\x00\x00\x00\x00\x00')     #horlines -
##    data = array.array('b','\x80\x40\x20\x10\x08\x04\x02\x01')   #diaglines /
##    data = array.array('b','\x01\x02\x04\x08\x10\x20\x40\x80')   #diaglines \
##    data = array.array('b','\xFF'+'\x80'*7)                                   # pluses +++
data = array.array('b','\x81\x42\x24\x18\x18\x24\x42\x81')   #  crosses xxx

def expose (da, event,cs):
    lin = cairo.LinearGradient(180,20,300,140)
    lin.add_color_stop_rgb(0,1,0,1)
    lin.add_color_stop_rgb(1,0,1,1)

    ctx = da.window.cairo_create()

## just circle
    ctx.set_source_rgb(0.4,0,0.5)
    ctx.arc(60,80,55,0,math.pi*2)
    ctx.stroke()
## circle filled with pattern from file
    ctx.save()
    ctx.arc(150,80,55,0,math.pi*2)
    ctx.clip()
    pat = cairo.SurfacePattern(cs)
    pat.set_extend(1)
    ctx.set_source(pat)
    ctx.paint()
    ctx.restore()
## circle filled with linear gradient and mask from data array
    ctx.save()
    ctx.arc(240,80,55,0,math.pi*2)    
    ctx.clip()
    sur= cairo.ImageSurface.create_for_data(data,3,8,8,1)
    ctx.set_source(lin)
    pat = cairo.SurfacePattern(sur)
    pat.set_extend(1)
    ctx.mask(pat)
    ctx.restore()

 
def main():
    fname = sys.argv[1]
    input = open(fname)
    imagebuf = input.read()
    pixbufloader = gtk.gdk.PixbufLoader()
    pixbufloader.write(imagebuf)
    pixbufloader.close()
    pixbuf = pixbufloader.get_pixbuf()
    imgw=pixbuf.get_width()
    imgh=pixbuf.get_height()

    cs = cairo.ImageSurface(0,imgw,imgh)
    ct = cairo.Context(cs)    
    ct2 = gtk.gdk.CairoContext(ct)
    ct2.set_source_pixbuf(pixbuf,0,0)
    ct2.paint()

    win = gtk.Window()
    win.connect('destroy', gtk.main_quit)
    win.set_default_size(300, 160)
    da = gtk.DrawingArea()
    win.add(da)
    da.connect('expose_event', expose,cs)
    win.show_all()
    gtk.main()

if __name__ == '__main__':
    if len(sys.argv) != 2:
        program = sys.argv[0]
        print program +':', 'usage:', program, '<filename>'
        sys.exit(0)
    else:
        main()