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Commit76d8b3c

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jkseppanQuLogic
andcommitted
Type-1 subsetting
This reduces pdf file sizes when usetex is active, at the cost ofsome complexity in the code. We implement a charstring bytecodeinterpreter to keep track of subroutine calls in font programs.Give dviread.DviFont a fake filename attribute and a get_fontmapmethod for character tracking.In backend_pdf.py, refactor _get_subsetted_psname so it calls a method_get_subset_prefix, and reuse that to create tags for Type-1 fonts.Mark the methods static since they don't use anything from the instance.Recommend merging to main to give people time to test this, not toa 3.10 point release.Closes#127.Co-Authored-By: Elliott Sales de Andrade <quantum.analyst@gmail.com>
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PDF files created with usetex now embed subsets of Type 1 fonts
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When using the PDF backend with the usetex feature,
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Matplotlib calls TeX to render the text and formulas in the figure.
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The fonts that get used are usually "Type 1" fonts.
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They used to be embedded in full
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but are now limited to the glyphs that are actually used in the figure.
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This reduces the size of the resulting PDF files.

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