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Commit3f1890b

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Rework mapping of dvi glyph indices to freetype indices.
In89a7e19, an API for converting "dvi glyph indices" (as storedin a dvi file) to FreeType-compatible keys (either "indices intothe native charmap" or "glyph names") was introduced. It wasintended that end users (i.e., backends) would check the type of`text.glyph_name_or_index` ((A) int or (B) str) and load the glyphaccordingly ((A) `FT_Set_Charmap(native_cmap); FT_Load_Char(index);` or(B) `FT_Load_Glyph(FT_Get_Name_Index(name));`); however, with the futureintroduction of {xe,lua}tex support, this kind of type checking becomesinconvenient, because {xe,lua}tex's "dvi glyph indices", which aredirectly equal to FreeType glyph indices (i.e. they would be loaded with`FT_Load_Glyph(index);`), would normally also be converted to ints.This PR introduces a new API (`_index_dvi_to_freetype`) to performthis mapping, always mapping to FreeType glyph indices (i.e. onecan always just call `FT_Load_Glyph` on the result). To do so,in case (A) it loads itself the native charmap (something theend user needed to do by themselves previously) and performs thecmap-to-index conversion (`FT_Get_Char_Index`) previously implicitin `FT_Load_Char`; in case (B) it performs itself the name-to-indexconversion (`FT_Get_Name_Index`). When {xe,lua}tex support isintroduced in the future, `_index_dvi_to_freetype` will just return theindex as is. Note that this API is intentionally kept private for now(even though it is used by textpath) and the old APIs are not deprecatedyet; I intend to wait until {xe,lua}tex support is actually merged to doso, to avoid possible future back-and-forth changes on the public APIs.In case (A), this PR also improves on the detection of the nativecharmap, which was previously detected via heuristics(`_select_native_charmap`), but is now read by directly accessing theType 1 font "encoding vector".
1 parentdc05767 commit3f1890b

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3 files changed

+65
-39
lines changed

3 files changed

+65
-39
lines changed

‎lib/matplotlib/dviread.py

Lines changed: 35 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -30,7 +30,7 @@
3030

3131
importnumpyasnp
3232

33-
frommatplotlibimport_api,cbook
33+
frommatplotlibimport_api,cbook,font_manager
3434

3535
_log=logging.getLogger(__name__)
3636

@@ -578,7 +578,7 @@ class DviFont:
578578
Size of the font in Adobe points, converted from the slightly
579579
smaller TeX points.
580580
"""
581-
__slots__= ('texname','size','_scale','_vf','_tfm')
581+
__slots__= ('texname','size','_scale','_vf','_tfm','_encoding')
582582

583583
def__init__(self,scale,tfm,texname,vf):
584584
_api.check_isinstance(bytes,texname=texname)
@@ -587,6 +587,7 @@ def __init__(self, scale, tfm, texname, vf):
587587
self.texname=texname
588588
self._vf=vf
589589
self.size=scale* (72.0/ (72.27*2**16))
590+
self._encoding=None
590591

591592
widths=_api.deprecated("3.11")(property(lambdaself: [
592593
(1000*self._tfm.width.get(char,0))>>20
@@ -631,6 +632,35 @@ def _height_depth_of(self, char):
631632
result[-1]=0
632633
returnresult
633634

635+
# TODO: Make this public when {xe,lua}tex support is merged; simultaneously
636+
# deprecate Text.glyph_name_or_index.
637+
def_index_dvi_to_freetype(self,idx):
638+
"""Convert dvi glyph indices to FreeType ones."""
639+
# Glyphs indices stored in the dvi file map to FreeType glyph indices
640+
# (i.e., which can be passed to FT_Load_Glyph) in various ways:
641+
# - if pdftex.map specifies an ".enc" file for the font, that file maps
642+
# dvi indices to Adobe glyph names, which can then be converted to
643+
# FreeType glyph indices with FT_Get_Name_Index.
644+
# - if no ".enc" file is specified, then the font must be a Type 1
645+
# font, and dvi indices directly index into the font's CharStrings
646+
# vector.
647+
# - (xetex & luatex, currently unsupported, can also declare "native
648+
# fonts", for which dvi indices are equal to FreeType indices.)
649+
ifself._encodingisNone:
650+
psfont=PsfontsMap(find_tex_file("pdftex.map"))[self.texname]
651+
ifpsfont.filenameisNone:
652+
raiseValueError("No usable font file found for {} ({}); "
653+
"the font may lack a Type-1 version"
654+
.format(psfont.psname.decode("ascii"),
655+
psfont.texname.decode("ascii")))
656+
face=font_manager.get_font(psfont.filename)
657+
ifpsfont.encoding:
658+
self._encoding= [face.get_name_index(name)
659+
fornamein_parse_enc(psfont.encoding)]
660+
else:
661+
self._encoding=face._get_type1_encoding_vector()
662+
returnself._encoding[idx]
663+
634664

635665
classVf(Dvi):
636666
r"""
@@ -1002,8 +1032,7 @@ def _parse_enc(path):
10021032
Returns
10031033
-------
10041034
list
1005-
The nth entry of the list is the PostScript glyph name of the nth
1006-
glyph.
1035+
The nth list item is the PostScript glyph name of the nth glyph.
10071036
"""
10081037
no_comments=re.sub("%.*","",Path(path).read_text(encoding="ascii"))
10091038
array=re.search(r"(?s)\[(.*)\]",no_comments).group(1)
@@ -1134,15 +1163,10 @@ def _print_fields(*args):
11341163
print(f"font:{font.texname.decode('latin-1')} "
11351164
f"(scale:{font._scale/2**20}) at{fontpath}")
11361165
face=FT2Font(fontpath)
1137-
TextToPath._select_native_charmap(face)
11381166
_print_fields("x","y","glyph","chr","w")
11391167
fortextingroup:
1140-
ifpsfont.encoding:
1141-
glyph_name=_parse_enc(psfont.encoding)[text.glyph]
1142-
else:
1143-
glyph_name=face.get_glyph_name(
1144-
face.get_char_index(text.glyph))
1145-
glyph_str=fontTools.agl.toUnicode(glyph_name)
1168+
glyph_str=fontTools.agl.toUnicode(
1169+
face.get_glyph_name(font._index_dvi_to_freetype(text.glyph)))
11461170
_print_fields(text.x,text.y,text.glyph,glyph_str,text.width)
11471171
ifpage.boxes:
11481172
print("--- BOXES ---")

‎lib/matplotlib/textpath.py

Lines changed: 2 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -238,17 +238,8 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
238238
ifchar_idnotinglyph_map:
239239
font.clear()
240240
font.set_size(self.FONT_SCALE,self.DPI)
241-
glyph_name_or_index=text.glyph_name_or_index
242-
ifisinstance(glyph_name_or_index,str):
243-
index=font.get_name_index(glyph_name_or_index)
244-
font.load_glyph(index,flags=LoadFlags.TARGET_LIGHT)
245-
elifisinstance(glyph_name_or_index,int):
246-
self._select_native_charmap(font)
247-
font.load_char(
248-
glyph_name_or_index,flags=LoadFlags.TARGET_LIGHT)
249-
else:# Should not occur.
250-
raiseTypeError(f"Glyph spec of unexpected type: "
251-
f"{glyph_name_or_index!r}")
241+
idx=text.font._index_dvi_to_freetype(text.glyph)
242+
font.load_glyph(idx,flags=LoadFlags.TARGET_LIGHT)
252243
glyph_map_new[char_id]=font.get_path()
253244

254245
glyph_ids.append(char_id)
@@ -269,23 +260,6 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
269260
return (list(zip(glyph_ids,xpositions,ypositions,sizes)),
270261
glyph_map_new,myrects)
271262

272-
@staticmethod
273-
def_select_native_charmap(font):
274-
# Select the native charmap. (we can't directly identify it but it's
275-
# typically an Adobe charmap).
276-
forcharmap_codein [
277-
1094992451,# ADOBE_CUSTOM.
278-
1094995778,# ADOBE_STANDARD.
279-
]:
280-
try:
281-
font.select_charmap(charmap_code)
282-
except (ValueError,RuntimeError):
283-
pass
284-
else:
285-
break
286-
else:
287-
_log.warning("No supported encoding in font (%s).",font.fname)
288-
289263

290264
text_to_path=TextToPath()
291265

‎src/ft2font_wrapper.cpp

Lines changed: 28 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1431,6 +1431,32 @@ PyFT2Font_get_image(PyFT2Font *self)
14311431
return py::array_t<unsignedchar>(dims, im.get_buffer());
14321432
}
14331433

1434+
constchar *PyFT2Font__get_type1_encoding_vector__doc__ =R"""(
1435+
Return a list mapping CharString indices of a Type 1 font to FreeType glyph indices.
1436+
1437+
Returns
1438+
-------
1439+
list[int]
1440+
)""";
1441+
1442+
static std::array<FT_UInt,256>
1443+
PyFT2Font__get_type1_encoding_vector(PyFT2Font *self)
1444+
{
1445+
auto face = self->x->get_face();
1446+
auto indices = std::array<FT_UInt,256>{};
1447+
for (auto i =0; i < indices.size(); ++i) {
1448+
auto len =FT_Get_PS_Font_Value(face, PS_DICT_ENCODING_ENTRY, i,nullptr,0);
1449+
if (len == -1) {
1450+
throw std::runtime_error{
1451+
"FT_Get_PS_Font_Value tried to access a non-existent value"};
1452+
}
1453+
auto buf = std::unique_ptr<char[]>{newchar[len]};
1454+
FT_Get_PS_Font_Value(face, PS_DICT_ENCODING_ENTRY, i, buf.get(), len);
1455+
indices[i] =FT_Get_Name_Index(face, buf.get());
1456+
}
1457+
return indices;
1458+
}
1459+
14341460
staticconstchar *
14351461
PyFT2Font_postscript_name(PyFT2Font *self)
14361462
{
@@ -1761,6 +1787,8 @@ PYBIND11_MODULE(ft2font, m, py::mod_gil_not_used())
17611787
PyFT2Font_get_sfnt_table__doc__)
17621788
.def("get_path", &PyFT2Font_get_path, PyFT2Font_get_path__doc__)
17631789
.def("get_image", &PyFT2Font_get_image, PyFT2Font_get_image__doc__)
1790+
.def("_get_type1_encoding_vector", &PyFT2Font__get_type1_encoding_vector,
1791+
PyFT2Font__get_type1_encoding_vector__doc__)
17641792

17651793
.def_property_readonly("postscript_name", &PyFT2Font_postscript_name,
17661794
"PostScript name of the font.")

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