• feat(fonts): add variable font instancing for PDF embedding Phase_1 - #278
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NicTanghe wants to merge 1 commit into
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• feat(fonts): add variable font instancing for PDF embedding Phase_1#278NicTanghe wants to merge 1 commit into
NicTanghe wants to merge 1 commit into
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Add APIs for inspecting variation axes and creating static font instances from arbitrary axis coordinates before shaping and embedding. Support TrueType glyf/gvar and CFF2 fonts, reject unresolved variation tables during serialization, and allow multiple instances of one source font in a document. Re-enable font subsetting with correct glyph ID remapping, add CFF2-to-CFF1 conversion, and cover full and subset embedding with OFL test fixtures. Automatic HTML/CSS variation selection remains outside this change because it requires integration with Azul's font selection and shaping pipeline.
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Add APIs for inspecting variation axes and creating static font
instances from arbitrary axis coordinates before shaping and embedding.
Support TrueType glyf/gvar and CFF2 fonts, reject unresolved variation
tables during serialization, and allow multiple instances of one source
font in a document.
Re-enable font subsetting with correct glyph ID remapping, add CFF2-to-CFF1
conversion, and cover full and subset embedding with OFL test fixtures.
Automatic HTML/CSS variation selection remains outside this change because
it requires integration with Azul's font selection and shaping pipeline.
HTML/Azul limitation
printpdf’s HTML renderer uses azul_layout for CSS font selection, shaping, and
layout. The current Azul interface does not pass computed variable-font coordinates
into font loading/shaping. Consequently, CSS such as font-weight: 800 or font-
variation-settings: "wght" 800 does not yet select a corresponding instance from a
single variable-font file.
This PR implements explicit variable-font instancing through the Rust API. Supporting
automatic HTML/CSS axis selection requires a follow-up change at the Azul font-
manager boundary. Normal CSS font-weight selection between separate static font files
remains unaffected.