[HarfBuzz] Example application using FriBidi, FreeType, and HarfBuzz
khaledhosny at eglug.org
Tue Mar 10 10:43:04 PDT 2015
At least mpv seems to be using libass to render all subtitles, so it might
be worth checking what are they doing.
On Mar 10, 2015 12:20 PM, "Salah-Eddin Shaban" <salshaaban at gmail.com>
> That's right. VLC uses libass to render SSA/ASS subtitles. But it has
> its own text rendering modules to render other subtitle formats.
> The most common format usually found on sites like opensubtitles.org
> is SubRip (.srt).
> So to use libass here the user has to convert the files to SSA
> beforehand, or VLC should convert the text to SSA at runtime, which is
> not the best option.
> On Tue, Mar 10, 2015 at 4:35 AM, Behdad Esfahbod
> <behdad.esfahbod at gmail.com> wrote:
> > Hi there,
> > That's very nice. Thanks for sharing.
> > That said, I was under the impression that VLC could already use
> HarfBuzz /
> > FriBidi to render subtitles using libass. Is that not the case?
> > behdad
> > On 15-03-08 12:58 PM, Salah-Eddin Shaban wrote:
> >> Hello,
> >> I would like to thank you very much for HarfBuzz.
> >> I'm currently trying to use it to add complex-script support to the
> >> text renderer of VLC Media Player, mainly for Arabic subtitle files. I
> >> tried first using Pango but was told there were compatibility issues
> >> with GLib, so HarfBuzz is the way to go.
> >> I had to struggle a little with the Unicode bidirectional algorithm
> >> and with getting to understand how Fribidi, FreeType, and HarfBuzz
> >> work together. Documentation is rather scarce so I had to dig through
> >> some source code, and to experiment with a test application.
> >> I still can't claim to understand everything about the algorithm or
> >> the process of rendering text. When I compare my code to the source
> >> code of Pango it seems too simple to be correct. But it's producing
> >> correct results, as far as I can see, for all text I test it on, and
> >> not just subtitle files.
> >> Anyway, I thought it might help someone get the general picture, if
> >> you think it's appropriate as another user example on the HarfBuzz
> >> wiki.
> >> Any comments or corrections are greatly appreciated.
> >> https://github.com/salshaaban/BidiRenderer
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