10,579
edits
Changes
Jump to navigation
Jump to search
Line 259:
Line 259: − + − pixmap = gtk.gdk.Pixmap(None, w, h, 24)+ − cairo_context = pixmap.cairo_create()+ − cairo_context.set_source_surface(xlib_surface, 0, 0)+ − cairo_context.paint()+ − + + + + − pixel = pixmap.get_image(x, y, 1, 1).get_pixel(0, 0)+ − − int((pixel & 0x00FF00) >> 8), # green − int((pixel & 0x0000FF) >> 0), 0) # blue
Features/GTK3/Porting (view source)
Revision as of 09:05, 14 November 2011
, 09:05, 14 November 2011→Going from Drawable to Cairo
<pre>
<pre>
# Map the xlib surface onto a pixmap
# create a new 1x1 cairo surface
cs = cairo.ImageSurface(cairo.FORMAT_RGB24, 1, 1);
cr = cairo.Context(cs)
# translate surface so that target pixel is at 0, 0
cr.set_source_surface(self.tw.turtle_canvas, -x, -y)
cr.rectangle(0,0,1,1)
cr.set_operator(cairo.OPERATOR_SOURCE)
cr.fill()
cs.flush() # ensure all writing is done
# Read the pixel
# Read the pixel
return (ord(pixels[2]), ord(pixels[1]), ord(pixels[0]), 0)
return(int((pixel & 0xFF0000) >> 16), # red
</pre>
</pre>