Hi Deepak,
On 15-12-22 04:35 PM, Deepak Jois wrote:
> I was adding support for hb_buffer_add_codepoints in luaharfbuzz[1],
> and I was confused about how clustering works:
>
> 1. Is it valid, if I initialise a buffer and then call
> hb_buffer_add_utf8, followed by hb_buffer_add_codepoints?
Yes.
> 2. When I try do the above by calling hb_buffer_add_utf8 with UTF8
> string ‘یہ ’ (U+06CC U+06C1 U+0020), followed by calling
> hb_buffer_add_codepoints with an array containing { U+06CC, U+06C1 },
> and then shape the output with Amiri font, I get this (offset and
> advance values elided for simplicity):
Arbitrary cluster values are supported. So you are allowed to get access to
the buffer and modify cluster values before calling hb_shape(). So, you can
adjust to whatever scheme you like.
> {
> {
> cluster = 1,
> codepoint = 2250,
> …
> },
> {
> cluster = 0,
> codepoint = 2106,
> …
> },
> {
> cluster = 4,
> codepoint = 3,
> …
> },
> {
> cluster = 2,
> codepoint = 2250,
> …
> },
> {
> cluster = 0,
> codepoint = 2106,
> …
> }
> }
> ---
>
> What is the right way to correlate the cluster values to the original input?
Really whatever you (the client) want it to mean.
behdad
> Deepak
>
> [1]:https://github.com/deepakjois/luaharfbuzz
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