Re: regarding all the possible functions that can be assigned to PangoCairoShapeRendererFunc func

[John Ralls <jralls ceridwen fremont ca us>]

On Sep 6, 2012, at 7:29 AM, Parth Kanungo <kanungoparth gmail com> wrote:

Hello all,

 

 

We know that PangoCairoShapeRendererFunc is a function pointer.

 

The function pango_cairo_context_set_shape_renderer in pangocairo-context.h assigns a PangoCairoShapeRendererFunc func its value.

 

I want to know what all are the possible functions that can be assigned to PangoCairoShapeRendererFunc func ??

 

(My purpose is to understand the working of pango_cairo_renderer_draw_shape() function in pangocairo-renderer.h)

 

Any help/suggestion would be appreciated.

Thanks in advance

You write a callback function that matches the signature of PangoCairoShapeRendererFunc [1] and use pango_cairo_context_set_shape_renderer() to set it as the callback on your PangoContext. When the context needs to render a shape, it calls your callback function.

This is another standard GObject programming construct. You'll find it much easier to understand Pango -- and most of the other libraries in the Gtk stack -- if you start by studying GObject. Since the documentation is written at a rather high level, you'll find a good grounding in OO programming helpful.

Regards,

John Ralls

[1] http://developer.gnome.org/pango/stable/pango-Cairo-Rendering.html#PangoCairoShapeRendererFunc