Hey, thanks for the response; chronotext is a cool site. :)
On 02/09/2014 04:01 AM, Ariel Malka wrote:
Hi Jeremy,
I have developed a solution based on Harfbuzz and ICU for rendering
Unicode text with C++ and OpenGL from the ground-up:
https://github.com/arielm/Unicode
The topic of line-breaking is also on my agenda (more on the long
term, nothing urgent...)
One of the directions I'm planning to check in the future:
https://github.com/adah1972/libunibreak
I wonder how do you handle topics like font-fallback,
script-itemization and BIDI, prior to shaping and line-breaking?
Font fallbacks I don't bother with. Script-itemization and BIDI I'm not
even sure what they are. :)
Does anyone else have any comments on my original post? I mean, EVERYONE
using harfbuzz is doing what I'm doing, how are they doing it? :)
Regarding one of your questions, it's easy to pass to Harfbuzz some
text previously processed with ICU, as demonstrated here:
https://github.com/arielm/Unicode/blob/v4.0.0/Projects/Rendering/src/TextRun.h#L50
HTH,
Ariel
http://chronotext.org
On Sat, Feb 8, 2014 at 12:01 AM, Jeremy Moles <[email protected]
<mailto:[email protected]>> wrote:
Hey guys! I'm working on a Python3-based OpenGL library and I want
to use the union of Harfbuzz and libicu to do some (a small
subset) of what Pango currently does. I cannot, unfortunately,
simply use Pango, as its dependency chain will likely stop my
clients' interest dead in its tracks. Further, there are some
issues when customizing Pango's rendering model (and I'm not
speaking without experience here, I've done it when I wrote
osgPango) that aren't ideal to work with.
So, I would like to use hb and icu to accomplish some very basic
layout in my OpenGL scenes (note: I will also be using Glyphy
instead of my own rasterized SDF font textures too). I will need
basic left|right|center alignment (potentitally justify, but it
isn't a request yet), some basic markup support, etc.
I nearly have everything working locally, but the one area I'm
having a lot of trouble with is knowing how--and in fact, WHOSE
responsibility it is--to determine how to break large lines of
text given my sizing constraints. This doesn't appear to be
something harfbuzz attempts to do, but it may have helper
functions nonetheless.
What I'm looking for are a few hints on how people (Behdad?) might
tackle this problem. ALL text in this library gets converted in
whitespace-normalized UTF8 using libicu and line breaks can only
be FORCED by using <p/> or <br/> markup. Otherwise, all breaks
should behave similarly to how they do in HTML.
If I feed my force-delimited lines of text (that is, break my
input feed up by <br>/<p>) one huge chunk at a time to harfbuzz, I
can get the extents for each glyph as if I had unlimited X
coordinate space. I can use these extents to position as required
by the calling function, but again, I'm having trouble determining
where it is safe to break.
Is this something libicu can handle? Can harfbuzz make it easier?
NOTE: When I "whitespace normalize" my string before ever passing
it harfbuzz, I use the UBRK API of libicu. There are also
functions like:
u_isspace()
...which look promising, but it expects a UChar32, which I do not
know how to easily fetch while using harfbuzz's UTF8 functions,
who operate on potential multibyte chars.
Thanks in advance!
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