Hello again,
I have been reviewing the tutorial provided with the source code for
harfbuzz and I am still uncertain on how to tell 'hb_shape' to use a
different glyph for a character in a buffer.
I have a string 'Coffee Time' and when I add that value to the hb_buffer
struct with the 'hb_buffer_add_utf*' if I call the hb_shape as done in
the tutorial it only pulls the glyphs '*.calt', but this behavior is not
exactly what I want.
The OTF font set I am using has '*.swsh" glyphs present for certain utf
characters, and I want shape to use the 'C.swsh' for the start of this
buffer when I call hb_shape.
I figure that the 'hb_features *' tells hb_shape how to treat the buffer
since the hb_feature_t has fields for a tag, the start point and end
point. Is this the correct way to instruct hb_shape on which glyphs to
use an alternative glyph (in my case I want to use C.swsh and not C.calt'
How does one construct this hb_feature_t struct, reading the provided
documentation 'hb_feature_from_string' looks like the call I wish to
use, but it has an argument called "str" I am assuming this is the
string value that will set the tag value in the struct, but I have not
found a correct value that will actually return an initialized
hb_feature struct.
I have tried the values from hb-shape --help-features from the command
line including other various other guesses and wild stabs, and none of
them seemed to work.
Is my reasoning correct, the array of features will tell hb_shape how to
shape the UTF buffer the way I want (replace glyphs with swashed
variants, granted from reading the documentation and code hb_shape will
try it's best). And is there an example on how to set a feature struct
and passing it to hb_shape, the tutorial for using harfbuzz just passes
a NULL value to hb_shape for the hb_feature_t * argument.
Thanks
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