On Sep 6, 2012, at 7:29 AM, Parth Kanungo <[email protected]> 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
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