Re: Rendering Pango fonts with DirectFB only

[Behdad Esfahbod <behdad behdad org>]

On 01/07/2010 10:08 AM, Some Guy wrote:
> This is what I ended up doing.  I see oddities with it in that the fonts
> being drawn are quite large compared to those being drawn when using
> directfb's drawString method.  I'm definitely loading the correct font
> family.
>
> The way I draw the text currently is by just rendering to a directfb
> scratch surface and then blitting that to my primary display surface.  I

If you transform the bitmap, that would degrades the quality.

> do the text rendering all within local space, so theres no transform
> matrix or anything I need to apply - its when I blit tot he primary
> surface that I apply transforms, but that code behaves as if I'm
> blitting an image with some transform.
>
> Any thoughts on why my fonts might be larger than expected?

Sure.  Pango font sizes are in points, not pixels.  Use:

  pango_cairo_context_set_resolution (context, 72.);

behdad

> Thanks,
>
> sb
>
> On Wed, Jan 6, 2010 at 6:48 PM, Behdad Esfahbod <behdad behdad org
> <mailto:behdad behdad org>> wrote:
>
>     On 01/06/2010 11:24 AM, Some Guy wrote:
>
>         Hello,
>
>         I was wondering if there is a package out there that allows pango
>         layouts to render to a DFB Surface without the use of GTK or
>         Cairo.  DFB
>         already knows how to draw FT2 fonts, but the user API is lacking and
>         only has a DrawString method.
>
>         Does anybody know of a library that pulls in Pango for the font
>         layout
>         but uses DFB as the renderer?  I saw there's some package out there
>         called pango-directfb, but I don't see anything about it on the
>         pango
>         site or in the git tree.
>
>
>     If you can get cairo-directfb working, you can then simply use
>     pangocairo.
>
>     behdad
>
>         Thanks,
>
>         sb