kopia lustrzana https://github.com/peterhinch/micropython-font-to-py
Fix and document font_test.py.
Peter Hinch
rodzic
5b0b3fce97
commit
d187b8da02
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@ -270,3 +270,54 @@ keeps the code small and efficient for the common (default) case.
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Larger character sets are assumed to be sparse and the emitted code uses an
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index optimised for sparse values and a binary search algorithm.
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# Appendix 3: font_test.py
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This enables a Python font file to be described and rendered at the command
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prompt. It provides a useful way of checking unknown font files.
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It runs under Python 3.2 or above. If you created a font `myfont.py` the
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following will render the supplied string (assuming that `font_test.py` has
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executable privilege):
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```bash
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./font_test myfont Hello
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```
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Omitting arguments (or supplying `--help`) will provide usage information.
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If no string is provided a default will be printed. This is designed to test
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fonts created with `-k extended`. Other fonts will show `?` characters for
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missing glyphs.
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Sample output:
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```bash
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$ ./font_test.py freesans1 Hello
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Vertical map
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Normal bit order
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Proportional spacing
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Dimensions height*max_width 23 * 23
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Start char " " (ord 32) end char "~" (ord 126)
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...................................................
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##.........##................##...##...............
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##.........##................##...##...............
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##.........##................##...##...............
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##.........##................##...##...............
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##.........##................##...##...............
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##.........##.......#####....##...##......#####....
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##.........##......#######...##...##.....#######...
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#############.....###....##..##...##....###...###..
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#############....###......##.##...##...###.....###.
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##.........##....##.......##.##...##...##.......##.
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##.........##....###########.##...##...##.......##.
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##.........##....###########.##...##...##.......##.
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##.........##....##..........##...##...##.......##.
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##.........##....##.......##.##...##...###.....###.
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##.........##.....##.....##..##...##....###...###..
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##.........##......########..##...##.....#######...
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##.........##.......#####....##...##......#####....
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...................................................
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...................................................
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...................................................
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...................................................
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...................................................
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```
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@ -73,66 +73,6 @@ def render_row_vmap(data, row, height, width, reverse):
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print(char, end='')
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def display(data, hmap, height, width, reverse):
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bpr = (width - 1)//8 + 1
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bpc = (height - 1)//8 + 1
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print('Height: {} Width: {}'.format(height, width))
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print('Bytes/row: {} Bytes/col: {}'.format(bpr, bpc))
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print('Data length: {}'.format(len(data)))
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# Check bytearray is the correct length
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if hmap:
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validate_hmap(data, height, width)
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else:
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validate_vmap(data, height, width)
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for row in range(height):
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if hmap:
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render_row_hmap(data, row, height, width, reverse)
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else:
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render_row_vmap(data, row, height, width, reverse)
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print()
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# TESTS: in order of code coverage
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# Basic test of Font class functionality
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# Usage font_test.font_test()
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def font_test():
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fnt = Font('FreeSans.ttf', 20)
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for char in 'WM_eg!.,':
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fnt[char][0].display()
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print(fnt.width)
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# Font character streaming
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# Usage font_test.test_stream('abc', 20, False, False, False)
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def test_stream(string, height, monospaced, hmap, reverse):
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fnt = Font("FreeSans.ttf", height, monospaced)
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height = fnt.height
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for char in string:
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width = fnt[char][1]
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data = bytearray(fnt.stream_char(char, hmap, reverse))
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display(data, hmap, height, width, reverse)
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def chr_addr(index, ordch):
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offset = 2 * (ordch - 32)
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return int.from_bytes(index[offset:offset + 2], 'little')
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# Font.build_arrays
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# Usage font_test.test_arrays('abc', 20, False, False, False)
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def test_arrays(string, height, monospaced, hmap, reverse):
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fnt = Font("FreeSans.ttf", height, monospaced)
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height = fnt.height
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data, index = fnt.build_arrays(hmap, reverse)
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for char in string:
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ordch = ord(char)
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offset = chr_addr(index, ordch)
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width = int.from_bytes(data[offset:offset + 2], 'little')
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offset += 2
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next_offs = chr_addr(index, ordch + 1)
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display(data[offset:next_offs], hmap, height, width, reverse)
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# Render a string to REPL using a specified Python font file
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# usage font_test.test_font('freeserif', 'abc')
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# Default tests outliers with fonts created with -k extended
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@ -157,27 +97,20 @@ def test_font(fontfile, string='abg'+chr(126)+chr(127)+chr(176)+chr(177)+chr(937
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render_row_vmap(data, row, height, width, myfont.reverse())
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print()
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usage = '''Usage:
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./font_test fontfile string
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fontfile is a Python font file name with the .py extension omitted.
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string is an optional string to render.
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If string is omitted a challenging test string will be rendered. This
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is for fonts created with -k extended. Other fonts will show "?" for
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nonexistent glyphs.
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Requires Python 3.2 or newer.
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'''
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# Create font file, render a string to REPL using it
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# usage font_test.test_file('FreeSans.ttf', 20, 'xyz')
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def test_file(fontfile, height, string, *, minchar=32, maxchar=126, defchar=ord('?'),
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fixed=False, hmap=False, reverse=False):
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if not write_font('myfont.py', fontfile, height, fixed,
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hmap, reverse, minchar, maxchar, defchar):
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print('Failed to create font file.')
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return
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if 'myfont' in sys.modules:
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del sys.modules['myfont'] # force reload
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import myfont
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height = myfont.height()
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for row in range(height):
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for char in string:
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data, _, width = myfont.get_ch(char)
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if myfont.hmap():
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render_row_hmap(data, row, height, width, myfont.reverse())
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else:
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render_row_vmap(data, row, height, width, myfont.reverse())
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print()
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os.unlink('myfont.py')
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if __name__ == "__main__":
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if len(sys.argv) < 2 or sys.argv[1] == '--help':
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print(usage)
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elif len(sys.argv) == 2:
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test_font(sys.argv[1])
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else:
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test_font(sys.argv[1], sys.argv[2])
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