<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">Thanks a lot Carl. That piece of code was very informative. <div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">----- Original Message ---- From: Carl Worth <cworth@cworth.org> To: anurag swarnkar <anu_swar10@yahoo.co.in> Cc: cairo@cairographics.org Sent: Monday, 28 January, 2008 8:02:23 AM Subject: Re: [cairo] how to cropping or clipping an image using cairo library On Mon, 28 Jan 2008 10:58:21 +0530 (IST), anurag swarnkar wrote: > I want to know whether there is any API available in cairo through > which i can crop or clip (getting a portion of image) an image? Yes. The simplest case, (which I'm guess is what you're wanting), is just a rectangle, but doing fancier stuff isn't actually any harder. I'll show both. For example, if you have the image in a cairo surface named "image" and you are drawing to some cairo context "cr" then you might do something like this, (let's assume that we want the origin of the complete image at (x0,y0) and that we want to display only a rectangular portion of the image (x,y)-(width,height)). So that would look like:     cairo_set_source_surface (cr, image, x0, y0);     cairo_rectangle (cr, x0 + x, y0 + y, width, height);     cairo_fill (cr); And if you wanted to crop out a circular portion of the image, you might instead do:     cairo_set_source_surface (cr, image, x0, y0);     cairo_arc (cr, x0 + width / 2, y0 + height / 2,           MIN (WIDTH,HEIGHT) / 2, 0, 2 * M_PI);     cairo_fill (cr); Or if you wanted to crop out any polygonal region in points (a,b), (c,d)...:     cairo_set_source_surface (cr, image, x0, y0);     cairo_move_to (cr, a, b);     cairo_line_to (cr, c, d);     ...     cairo_fill (cr); Anyway, hopefully that gives you the basic idea. And of course, you can "crop out" text-shaped portions of an image with cairo_set_source_surface;cairo_show_text as well. Have fun with cairo! -Carl </div> </div></div> <hr size=1></hr> Get the freedom to save as many mails as you wish. <a href="http://in.rd.yahoo.com/tagline_mail_5/*http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html/">Click here to know how.</a></body></html>