kopia lustrzana https://github.com/peterhinch/micropython-font-to-py
Alternative .py writer
Jacques Supcik
rodzic
ee9dbb2a1b
commit
db07a856bc
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@ -25,51 +25,39 @@
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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import importlib.metadata
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import sys
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from pathlib import Path
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import click
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import freetype
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from .byte_writer import ByteWriter
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from .byte_writer import AltByteWriter
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from .font import Font
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VERSION = importlib.metadata.version("micropython-font-to-py")
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# Define a global
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def var_write(stream, name, value):
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stream.write(f"{name} = {value}\n")
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STR01 = """# Code generated by font_to_py.
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HEADER_TPL = """# Code generated by font_to_py.
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# Font: {font:s}{charset:s}
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# Cmd: {cmd:s}
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version = '{version:s}'
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"""
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# Code emitted for charsets spanning a small range of ordinal values
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STR02 = """_mvfont = memoryview(_font)
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_mvi = memoryview(_index)
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ifb = lambda l : l[0] | (l[1] << 8)
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GET_CH_I_TPL = """def get_ch(self, ch):
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def ifb(l):
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return l[0] | (l[1] << 8)
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def get_ch(ch):
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oc = ord(ch)
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ioff = 2 * (oc - {min:d} + 1) if oc >= {min:d} and oc <= {max:d} else 0
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doff = ifb(_mvi[ioff : ])
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width = ifb(_mvfont[doff : ])
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"""
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ioff = 2 * (oc - 32 + 1) if oc >= self.min_ch and oc <= self.max_ch else 0
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doff = ifb(self._index[ioff:])
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width = ifb(self._font[doff:])"""
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# Code emiited for large charsets, assumed by build_arrays() to be sparse.
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# Binary search of sorted sparse index.
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# Offset into data array is saved after dividing by 8
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STRSP = """_mvfont = memoryview(_font)
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_mvsp = memoryview(_sparse)
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ifb = lambda l : l[0] | (l[1] << 8)
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GET_CH_S_TPL = """def get_ch(self, ch):
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def ifb(l):
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return l[0] | (l[1] << 8)
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def bs(lst, val):
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def bs(lst, val):
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while True:
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m = (len(lst) & ~ 7) >> 1
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v = ifb(lst[m:])
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@ -79,39 +67,103 @@ def bs(lst, val):
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return 0
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lst = lst[m:] if v < val else lst[:m]
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def get_ch(ch):
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doff = bs(_mvsp, ord(ch)) << 3
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width = ifb(_mvfont[doff : ])
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"""
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doff = bs(self._sparse, ord(ch)) << 3
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width = ifb(self._font[doff : ])"""
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# Code emitted for horizontally mapped fonts.
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STR02H = """
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next_offs = doff + 2 + ((width - 1)//8 + 1) * {height:d}
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return _mvfont[doff + 2:next_offs], {height:d}, width
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GET_CH_HMAP_TPL = """
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next_offs = doff + 2 + ((width - 1)//8 + 1) * self.height
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return _mvfont[doff + 2:next_offs], self.height, width
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"""
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# Code emitted for vertically mapped fonts.
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STR02V = """
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next_offs = doff + 2 + (({height:d} - 1)//8 + 1) * width
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return _mvfont[doff + 2:next_offs], {height:d}, width
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GET_CH_VMAP_TPL = """
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next_offs = doff + 2 + ((self.height - 1)//8 + 1) * width
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return _mvfont[doff + 2:next_offs], self.height, width
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"""
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# Extra code emitted where -i is specified.
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STR03 = '''
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def glyphs():
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for c in """{}""":
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yield c, get_ch(c)
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GLYPH_TPL = '''
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def glyphs(self):
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for c in """{keys:s}""":
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yield c, self.get_ch(c)
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'''
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OBJECT_BEGIN_TPL = """font = type(
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"",
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(object,),
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{
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"""
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def write_func(stream, name, arg):
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stream.write(f"def {name}():\n return {arg}\n\n")
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OBJECT_END_TPL = """ },
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)()
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"""
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def write_font( # noqa: PLR0913
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def write_attribute(stream, name, value, indent=8):
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stream.write(" " * indent + f'"{name}": {value},\n')
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def write_data( # noqa: PLR0913
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stream, fnt, font_path, hmap, reverse, iterate, charset
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):
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height = fnt.height # Actual height, not target height
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minchar = min(fnt.crange)
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maxchar = max(fnt.crange)
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st = "" if charset == "" else f" Char set: {charset}"
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cl = " ".join([str(Path(sys.argv[0]).stem), *sys.argv[1:]])
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stream.write(HEADER_TPL.format(font=Path(font_path).stem, charset=st, cmd=cl))
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data, index, sparse = fnt.build_arrays(hmap, reverse)
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if sparse: # build_arrays() has returned a sparse index
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click.echo("Sparse")
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stream.write(GET_CH_S_TPL)
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else:
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click.echo("Normal")
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stream.write(GET_CH_I_TPL)
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if hmap:
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stream.write(GET_CH_HMAP_TPL)
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else:
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stream.write(GET_CH_VMAP_TPL)
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if iterate:
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stream.write(GLYPH_TPL.format(keys="".join(sorted(fnt.keys()))))
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stream.write(OBJECT_BEGIN_TPL)
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write_attribute(stream, "height", height)
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write_attribute(stream, "baseline", fnt._max_ascent)
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write_attribute(stream, "max_width", fnt.max_width)
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write_attribute(stream, "hmap", hmap)
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write_attribute(stream, "reverse", reverse)
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write_attribute(stream, "monospaced", fnt.monospaced)
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write_attribute(stream, "min_ch", minchar)
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write_attribute(stream, "max_ch", maxchar)
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bw_font = AltByteWriter(stream, "_font")
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bw_font.odata(data)
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bw_font.eot()
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if sparse: # build_arrays() has returned a sparse index
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bw_sparse = AltByteWriter(stream, "_sparse")
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bw_sparse.odata(sparse)
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bw_sparse.eot()
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else:
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bw_index = AltByteWriter(stream, "_index")
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bw_index.odata(index)
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bw_index.eot()
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write_attribute(stream, "get_ch", "get_ch")
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if iterate:
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write_attribute(stream, "glyphs", "glyphs")
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stream.write(OBJECT_END_TPL)
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def write_alt_font( # noqa: PLR0913
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op_path,
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font_path,
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height,
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@ -139,73 +191,3 @@ def write_font( # noqa: PLR0913
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click.echo(f"Can't open {op_path} for writing")
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return False
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return True
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def write_data( # noqa: PLR0913
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stream, fnt, font_path, hmap, reverse, iterate, charset
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):
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height = fnt.height # Actual height, not target height
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minchar = min(fnt.crange)
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maxchar = max(fnt.crange)
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st = "" if charset == "" else f" Char set: {charset}"
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cl = " ".join([str(Path(sys.argv[0]).stem), *sys.argv[1:]])
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stream.write(
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STR01.format(font=Path(font_path).stem, charset=st, cmd=cl, version=VERSION)
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)
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write_func(stream, "height", height)
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write_func(stream, "baseline", fnt._max_ascent)
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write_func(stream, "max_width", fnt.max_width)
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write_func(stream, "hmap", hmap)
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write_func(stream, "reverse", reverse)
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write_func(stream, "monospaced", fnt.monospaced)
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write_func(stream, "min_ch", minchar)
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write_func(stream, "max_ch", maxchar)
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if iterate:
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stream.write(STR03.format("".join(sorted(fnt.keys()))))
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data, index, sparse = fnt.build_arrays(hmap, reverse)
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bw_font = ByteWriter(stream, "_font")
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bw_font.odata(data)
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bw_font.eot()
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if sparse: # build_arrays() has returned a sparse index
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bw_sparse = ByteWriter(stream, "_sparse")
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bw_sparse.odata(sparse)
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bw_sparse.eot()
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stream.write(STRSP)
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click.echo("Sparse")
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else:
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bw_index = ByteWriter(stream, "_index")
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bw_index.odata(index)
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bw_index.eot()
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stream.write(STR02.format(min=minchar, max=maxchar))
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click.echo("Normal")
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if hmap:
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stream.write(STR02H.format(height=height))
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else:
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stream.write(STR02V.format(height=height))
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# BINARY OUTPUT
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# hmap reverse magic bytes
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# 0 0 0x3f 0xe7
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# 1 0 0x40 0xe7
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# 0 1 0x41 0xe7
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# 1 1 0x42 0xe7
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def write_binary_font(op_path, font_path, height, hmap, reverse):
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try:
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fnt = Font(
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font_path, height, 32, 126, True, None, ""
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) # All chars have same width
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except freetype.ft_errors.FT_Exception:
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click.echo(f"Can't open {font_path}")
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return False
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sig = 1 if hmap else 0
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if reverse:
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sig += 2
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try:
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with open(op_path, "wb") as stream:
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data = fnt.build_binary_array(hmap, reverse, sig)
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stream.write(data)
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except OSError:
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click.echo(f"Can't open {op_path} for writing")
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return False
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return True
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@ -63,3 +63,25 @@ class ByteWriter:
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if self.bytecount:
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self._eot()
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self.stream.write("\n")
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class AltByteWriter(ByteWriter):
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def __init__(self, stream, varname, indent=8):
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self.stream = stream
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self.indent = indent
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self.stream.write(" " * self.indent + f'"{varname}": memoryview(\n')
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self.bytecount = 0 # For line breaks
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def _eol(self):
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self.stream.write('"\n')
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def _eot(self):
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self.stream.write('"\n')
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self.stream.write(" " * self.indent + "),\n")
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def _bol(self):
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self.stream.write(" " * (self.indent + 4) + 'b"')
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def eot(self): # User force EOL if one hasn't occurred
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if self.bytecount:
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self._eot()
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@ -34,6 +34,7 @@ from pathlib import Path
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import click
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import freetype
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from .alt_writer import write_alt_font
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from .bin_writer import write_binary_font
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from .py_writer import write_font
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@ -72,6 +73,12 @@ CONTEXT_SETTINGS = dict(max_content_width=100)
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is_flag=True,
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help="Produce binary (random access) font file.",
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)
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@click.option(
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"-a",
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"--alt",
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is_flag=True,
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help="Use alt python writer (EXPERIMENTAL).",
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)
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@click.option(
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"-i",
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"--iterate",
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@ -124,6 +131,7 @@ def main( # noqa: C901, PLR0913, PLR0912
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reverse,
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fixed,
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binary,
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alt,
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iterate,
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smallest,
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largest,
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@ -205,7 +213,8 @@ def main( # noqa: C901, PLR0913, PLR0912
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click.echo(f"Found font with size {height!s}")
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click.echo("Writing Python font file.")
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if not write_font(
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if alt:
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res = write_alt_font(
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outfile,
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infile,
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height,
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@ -218,7 +227,24 @@ def main( # noqa: C901, PLR0913, PLR0912
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cset,
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iterate,
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bitmapped,
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):
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)
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else:
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res = write_font(
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outfile,
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infile,
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height,
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fixed,
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xmap,
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reverse,
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smallest,
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largest,
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errchar,
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cset,
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iterate,
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bitmapped,
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)
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if not res:
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sys.exit(1)
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click.echo(f"{outfile} written successfully.")
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@ -37,12 +37,6 @@ from .font import Font
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VERSION = importlib.metadata.version("micropython-font-to-py")
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# Define a global
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def var_write(stream, name, value):
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stream.write(f"{name} = {value}\n")
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STR01 = """# Code generated by font_to_py.
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# Font: {font:s}{charset:s}
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# Cmd: {cmd:s}
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@ -107,6 +101,11 @@ def glyphs():
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'''
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# Define a global
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def var_write(stream, name, value):
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stream.write(f"{name} = {value}\n")
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def write_func(stream, name, arg):
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stream.write(f"def {name}():\n return {arg}\n\n")
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