Pango manual rendering
Hi, I want to use Pango for layout, but not for rendering. I have a proof of concept that works, but I think it's not the right way of doing things :) I create a PangoLayout with my text, then get a PangoLayoutIter, then I start calling next_line() on it until it returns FALSE. On every iteration, I get a run (that returns a PangoGlyphItem) and iterate over the contained PangoGlyphString. This works but, as I said, I think it's the wrong thing to do, I'm not sure if depending on "next_line()" is a good idea, I'm not sure if there is a correlation between that call and the call to "get_run()". The second problem is that for every glyph, I get the PangoGlyphGeometry, but the X and Y offsets are always 0. This might be just because the font's I've tried work like that, but I just want to make sure. Another unrelated question is, how can I disable ligatures using Pango? Sorry if this is a bit confusing, but there is little to no information about what I'm trying to do. Thank you in advance! ___ gtk-i18n-list mailing list gtk-i18n-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-i18n-list
Re: Pango manual rendering
On 14-08-01 11:04 AM, Edu García wrote: > Hi, > > I want to use Pango for layout, but not for rendering. I have a proof of > concept that works, but I think it's not the right way of doing things :) > > I create a PangoLayout with my text, then get a PangoLayoutIter, then I start > calling next_line() on it until it returns FALSE. On every iteration, I get a > run (that returns a PangoGlyphItem) and iterate over the contained > PangoGlyphString. > > This works but, as I said, I think it's the wrong thing to do, I'm not sure if > depending on "next_line()" is a good idea, I'm not sure if there is a > correlation between that call and the call to "get_run()". I think that's how you are supposed to call it. > The second problem is that for every glyph, I get the PangoGlyphGeometry, but > the X and Y offsets are always 0. This might be just because the font's I've > tried work like that, but I just want to make sure. Keep accumulating the advance. Just add X / Y offsets to the sum of advances of previous glyphs on the line, to get the position of current glyph. > Another unrelated question is, how can I disable ligatures using Pango? Currently you can't. > Sorry if this is a bit confusing, but there is little to no information about > what I'm trying to do. -- behdad http://behdad.org/ ___ gtk-i18n-list mailing list gtk-i18n-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-i18n-list
Re: Pango manual rendering
Thank you for your response. That's how I'm using the geometry right now, but I don't seem to get things like alignment work. Even after setting a width on my layout, with right alignment I get the exact same result as with left alignment (I assumed the first glyph will get a very big X offset, to set the line start position, but it's not happening) As for ligatures, is there any way of getting the underlying Harfbuzz handle and do it there, even with some sort of hack? Again, thank you for your responses! On Aug 2, 2014 6:51 AM, "Behdad Esfahbod" wrote: > On 14-08-01 11:04 AM, Edu García wrote: > > Hi, > > > > I want to use Pango for layout, but not for rendering. I have a proof of > > concept that works, but I think it's not the right way of doing things :) > > > > I create a PangoLayout with my text, then get a PangoLayoutIter, then I > start > > calling next_line() on it until it returns FALSE. On every iteration, I > get a > > run (that returns a PangoGlyphItem) and iterate over the contained > > PangoGlyphString. > > > > This works but, as I said, I think it's the wrong thing to do, I'm not > sure if > > depending on "next_line()" is a good idea, I'm not sure if there is a > > correlation between that call and the call to "get_run()". > > I think that's how you are supposed to call it. > > > > The second problem is that for every glyph, I get the > PangoGlyphGeometry, but > > the X and Y offsets are always 0. This might be just because the font's > I've > > tried work like that, but I just want to make sure. > > Keep accumulating the advance. Just add X / Y offsets to the sum of > advances > of previous glyphs on the line, to get the position of current glyph. > > > > Another unrelated question is, how can I disable ligatures using Pango? > > Currently you can't. > > > > Sorry if this is a bit confusing, but there is little to no information > about > > what I'm trying to do. > > > -- > behdad > http://behdad.org/ > ___ gtk-i18n-list mailing list gtk-i18n-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-i18n-list
