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Support {lua,xe}tex as alternative usetex engine.
Currently, this PR is mostly a proof of concept; it only implements thedvi generation and parsing parts, but does not implement rendering inany of the builtin backends, except svg (under rcParams["svg.fonttype"]= "none", the default). However, there is a companion branch on themplcairo repository, also named "luadvi", which implements support.Example (requiring both this PR, and mplcairo installed from its luadvibranch):```import matplotlib as mpl; mpl.use("module://mplcairo.qt")from matplotlib import pyplot as pltplt.rcParams["text.latex.engine"] = "lualatex" # or "xelatex"plt.rcParams["text.latex.preamble"] = ( # {lua,xe}tex can use any font installed on the system, spec'd using its # "normal" name. # Some scaling issues currently remain with luatex, e.g. try DejaVu Sans. r"\usepackage{fontspec}\setmainfont{TeX Gyre Pagella}")plt.figtext(.5, .5, r"\textrm{gff\textwon}", usetex=True)plt.show()```TODO:- Fix many likely remaining bugs.- Rework font selection in texmanager, which is currently very ad-hoc due to the limited number of fonts supported by latex.- Implement rendering support in the (other) builtin backends. In particular, the Agg (and, if we care, cairo) backend will require significant reworking because dvipng, currently used to rasterize dvi to png, doesn't support luatex-generated dvi; instead we will need to proceed as with the other backends, reading the glyphs one at a time from the dvi file and rasterizing them one at a time to the output buffer. Working on the other backends is not very high on my priority list (as I already have mplcairo as playground...) so it would be nice if others showed some interest for it :-)1 parenta9dc9ac commit00f1e33
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