[HarfBuzz] Render Persian probelm

[bianxg]

It works well when use 'hb_buffer_guess_segment_properties'. Thanks.


But, I don't understand this sentence. Can you explain more?
"Also modern Persian language has a ISO 639-1 code, "fa", which should be used for your case instead AFAIK if is needed at all (not many fonts are doing something specific for Persian)."


------------------ 原始邮件 ------------------
发件人: "Ebrahim Byagowi"<ebraminio at gmail.com>;
发送时间: 2020年2月9日(星期天) 晚上10:53
收件人: "bianxg"<765033267 at qq.com>;
抄送: "harfbuzz"<harfbuzz at lists.freedesktop.org>;
主题: Re: [HarfBuzz] Render Persian probelm



Hey there, Old Persian which you've used is a different script and wasn't written in RTL also, the correct script selection for modern Persian is Arabic, feel free to just use `hb_buffer_guess_segment_properties` which sets it based on text you've given.


Also modern Persian language has a ISO 639-1 code, "fa", which should be used for your case instead AFAIK if is needed at all (not many fonts are doing something specific for Persian).


Cheers



On Sun, Feb 9, 2020 at 4:43 PM bianxg <765033267 at qq.com> wrote:

Hi,


I'm using HarfBuzz with freetype to render Persian text. I can not find any example about this. 
This is my config. Is it right? I can display Persian result.but I think it's not right.


m_language = "pes";
m_script = HB_SCRIPT_OLD_PERSIAN;
m_direction = HB_DIRECTION_RTL;



m_hbfont = hb_ft_font_create(s_ft_face, NULL);
m_hbbuffer = hb_buffer_create();
hb_buffer_allocation_successful(m_hbbuffer);

...
hb_buffer_reset(m_hbbuffer);
hb_buffer_set_direction(m_hbbuffer, m_direction);
hb_buffer_set_script(m_hbbuffer, m_script);
hb_buffer_set_language(m_hbbuffer, hb_language_from_string(m_language.c_str(), m_language.size()));





Thanks,
Bian
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