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micropython-font-to-py
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README updated.

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Peter Hinch 2017-01-12 16:03:36 +00:00
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@ -56,14 +56,17 @@ RAM usage when importing fonts stored as frozen bytecode.
# Limitations # Limitations
Only the ASCII character set from ``chr(32)`` to ``chr(126)`` is supported. By default the ASCII character set from ``chr(32)`` to ``chr(126)`` is supported
Kerning is not supported. Fonts are one bit per pixel. This does not rule out but command line arguments enable the range to be modified with extended ASCII
colour displays: the device driver can add colour information at the rendering characters to ``chr(255)`` being included if required. Kerning is not supported.
stage. It does assume that all pixels of a character are rendered identically. Fonts are one bit per pixel. This does not rule out colour displays: the device
driver can add colour information at the rendering stage. It does assume that
all pixels of a character are rendered identically.
Converting font files programmatically works best for larger fonts. For small Converting font files programmatically works best for larger fonts. For small
fonts, like the 8*8 default used by the SSD1306 driver, it is best to use fonts, like the 8*8 default used by the SSD1306 driver, it is best to use
binary font files: these are hand designed for rendering at a specific size. hand-designed binary font files: these are optiised for rendering at a specific
size.
# Font file interface # Font file interface
@ -76,6 +79,8 @@ provided to font-to-py:
``hmap`` Returns ``True`` if font is horizontally mapped. Should return ``True`` ``hmap`` Returns ``True`` if font is horizontally mapped. Should return ``True``
``reverse`` Returns ``True`` if bit reversal was specified. Should return ``False`` ``reverse`` Returns ``True`` if bit reversal was specified. Should return ``False``
``monospaced`` Returns ``True`` if monospaced rendering was specified. ``monospaced`` Returns ``True`` if monospaced rendering was specified.
``min_ch`` Returns the ordinal value of the lowest character in the file.
``max_ch`` Returns the ordinal value of the highest character in the file.
Glyphs are returned with the ``get_ch`` method. Its argument is a character Glyphs are returned with the ``get_ch`` method. Its argument is a character
and it returns the following values: and it returns the following values: