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Commit 7dd6af5

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jkseppanjkseppan
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Type-1 subsetting
This reduces pdf file sizes when usetex is active, at the cost of some complexity in the code. We implement a charstring bytecode interpreter to keep track of subroutine calls in font programs. Recommend merging to main to give people time to test this, not to a 3.10 point release. Give dviread.DviFont a fake filename attribute and a get_fontmap method for character tracking. Add type hints to the code this touches. Closes #127.
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‎doc/api/next_api_changes/behavior/20716-JKS.rst

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Type1Font.subset
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~~~~~~~~~~~~~~~~
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``_type1font.Type1Font`` has a new ``subset`` method that creates a subset
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of the font comprising only the characters used. This is used by the PDF backend.

‎doc/users/next_whats_new/type1_subset.rst

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Type 1 fonts are now subsetted in PDF output
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--------------------------------------------
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When using the usetex feature with the PDF backend, Type 1 fonts are embedded
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in the PDF output. These fonts used to be embedded in full, but they are now
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subsetted to only include the glyphs that are actually used in the figure.

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