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Corrections to FONT_TO_PY.md.

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Peter Hinch 2019-09-08 17:37:27 +01:00
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FONT_TO_PY.md
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@ -54,7 +54,7 @@ Further arguments ensure that the byte contents and layout are correct for the
target display hardware. Their usage should be specified in the documentation target display hardware. Their usage should be specified in the documentation
for the device driver. for the device driver.
Examples of usage to produce a file `myfont.py` with height of 23 pixels: Examples of usage to produce Python fonts with a height of 23 pixels:
```shell ```shell
$ font_to_py.py FreeSans.ttf 23 myfont.py $ font_to_py.py FreeSans.ttf 23 myfont.py
$ font_to_py.py -k extended FreeSans.ttf 23 my_extended_font.py $ font_to_py.py -k extended FreeSans.ttf 23 my_extended_font.py
@ -65,7 +65,8 @@ $ font_to_py.py -k extended FreeSans.ttf 23 my_extended_font.py
1. Font file path. Must be a ttf or otf file. 1. Font file path. Must be a ttf or otf file.
2. Height in pixels. 2. Height in pixels.
3. Output file path. Filename must have a .py extension. 3. Output file path. Filename must have a .py extension (unless writing a
binary font).
### Optional arguments: ### Optional arguments:
@ -157,11 +158,11 @@ time is slow.
Binary files currently support only the standard ASCII character set. There is Binary files currently support only the standard ASCII character set. There is
no error character: the device driver must ensure that seeks are within range. no error character: the device driver must ensure that seeks are within range.
Consequently the following arguments are invalid: Only the following optional arguments are valid:
* -s or --smallest * -f or --fixed.
* -l or --largest * -x or --xmap.
* -e or --errchar * -r or --reverse.
# Dependencies, links and licence # Dependencies, links and licence
@ -234,7 +235,5 @@ The code now behaves as follows. If the character set contains no more than 95
characters (including the default) the emitted Python file is as before. This characters (including the default) the emitted Python file is as before. This
keeps the code small and efficient for the common (default) case). keeps the code small and efficient for the common (default) case).
Larger character sets are assumed to be sparse. Characters with ordinal values Larger character sets are assumed to be sparse and the emitted code uses an
which place them in the first 95 characters are looked up using the normal index optimised for sparse values and a binary search algorithm.
index. Those above use an index optimised for sparse values and a binary search
algorithm.