Re: librsvg api

[Stefan Kost <ensonic hora-obscura de>]

Kalle Vahlman schrieb:
> 2009/4/17 Stefan Kost <ensonic hora-obscura de>:
>   
>> hi,
>>
>> I am using librsvg to get pixbufs for my app. I could not find a dedicated list,
>> for it, hope this one is okay.
>>
>> First I am using deprecated api:
>>  rsvg_pixbuf_from_file_at_size
>> as when using
>>  rsvg_handle_get_pixbuf
>> I can specify the size it should be rendered (tried rsvg_handle_set_dpi and
>> rsvg_handle_set_dpi_x_y). Any idea here?
>>
>> I would like to use not deprecated rsvg_handle_ API, as I need to resize the
>> images and I'd like to keep the svg loaded. Just set new size and rerender.
>>     
>
> To do that, you'll need to render to a cairo surface with approperiate
> scaling and convert that to pixbuf. You can get the "natural" pixel
> size of the SVG with rsvg_handle_get_dimensions() to calculate the
> scaling factor.
>   
I was wondering if there is a direct way, as with the deprecated api
there was. But thanks for your suggestions.

Stefan

> The conversion can be done by either rendering to a GdkDrawable (ie.
> pixmap) and then using gdk_pixbuf_get_from_drawable() or using an
> image surface and then converting the image data to the format used by
> GdkPixbuf. GOffice has an example implementation of that conversion:
>
>   http://git.gnome.org/cgit/goffice/tree/goffice/utils/go-cairo.c#n305
>
> Personally I'd prefer the latter in the current X.Org driver
> landscape; drawing a complex SVG (specially with gradients) can
> seriously suck if the server needs to do lots of fallbacks to software
> rendering...
>
>   
>> Besides some more dom exposure would be sweet.
>>     
>
> Indeed!
>
>   
>> Not sure if anyone is actually even working on the lib still (which would be sad).
>>     
>
> It seriously lacks some loving, that's for sure.
>
>