Thanks Benjamin for your input I actually would be working on cairo 1.8 so probably this will not help Can anyone suggest if we can do something like this? rgb = cairo_get_pixel(x,y) where x,y is the coordinate on screen cairo_set_pixel(x,y, rgb ^ xorcolor) or something similar Thx in advance <div class="gmail_quote">On Wed, Aug 25, 2010 at 6:12 PM, Benjamin Otte <<a href="mailto:otte@redhat.com">otte@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">You cannot do XOR with Cairo. What you can get (and I suspect that's what you want) is INVERT. To get the effect of INVERT, you'd do: cairo_set_operator (cr, CAIRO_OPERATOR_DIFFERENCE); cairo_set_source_rgb (cr, 1, 1, 1); Note that this requires Cairo 1.9 snapshots. Benjamin <div><div></div><div class="h5"> On Wed, 2010-08-25 at 17:02 +0530, Prasanta Sadhukhan wrote: > Hi > > I am a newbie to cairo. I saw in some of the discussion that cairo > does not support bitwise XOR drawing (like drawing same shape on same > area will make it disappear) > Can anyone please suggest as to how can I perform XOR drawing of > draw/fill shape ex fillrect with cairo APIs? > > I have some legacy programs that need to use XOR based drawing like > blinking of cursor under a line > Thx in advance > </div></div>> -- > cairo mailing list > <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> > <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> </blockquote></div>