On Sat, Jun 25, 2016 at 8:57 AM, Khaled Hosny <[email protected]> wrote:
> On Fri, Jun 24, 2016 at 10:06:07PM -0400, Kelvin Ma wrote: > > How do you set the initial cluster value? So that harfbuzz will start > > counting from some number like 25 instead of 0. > > Use hb_buffer_add(), or just do 25 + cluster in your code. > > > Also what’s the point of > > *item_offset* and *item_length* in the buffer_add functions? > > It is explained in the documentation: > > http://behdad.github.io/harfbuzz/harfbuzz-Buffers.html#hb-buffer-add-codepoints > > So you have to add the text to the buffer one letter at a time? That could get very slow with python loops and function calls > > Don’t you > need > > context to be ignored if the boundaries of the text you want to shape > fall > > inside a cluster? Like in the string 'af[fluency s]tate' where only the > > 'fluency s' is supposed to be shaped? > > Depends on why you are shaping “fluency s” alone, if it is because of, > say, font change, then you need HarfBuzz to know the context otherwise > you get broken Arabic shaping. > Well font change would produce a separate run that wouldn’t know about the other runs so context can only be within a same-direction, same-font run. But would adding the context & using the start and finish indexes cause latin ligatures like fi to get shaped when they shouldn’t be is what I’m asking? > > Regards, > Khaled >
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