73 lines
2.3 KiB
Python
73 lines
2.3 KiB
Python
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# Tool to extract 8x8 font data, save to bitmap file, and apply modifications
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# to source code after editing the bitmap.
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from __future__ import print_function
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from matplotlib.pyplot import imread, imsave, imshow, show
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import numpy as np
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import sys
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# Where to find the font data - may need updated if code has changed.
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source_file = 'ui_lcd_hy28_fonts.c'
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start_marker = 'const uint8_t GL_ASCII8x8_Table [] ='
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start_offset = 2 # Data starts this number of lines after start marker.
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end_marker = '};' # Indicates end of font data.
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# Image filename used in extract and insert modes.
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image_file = 'font-8x8.png'
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#mode = None
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#mode = show
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mode = extract
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#mode = insert
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if len(sys.argv) > 1:
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mode = sys.argv[1]
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if mode not in ('show', 'extract', 'insert'):
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print("Usage: %s { show | extract | insert }" % sys.argv[0])
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sys.exit(1)
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# Get the literals used to populate the font array in the source file
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lines = [line.rstrip() for line in open(source_file).readlines()]
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start = lines.index(start_marker) + start_offset
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end = start + lines[start:].index(end_marker)
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data = str.join("", lines[start:end])
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# Eval the literals to get the values into a numpy array
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packed = eval("np.array([%s], np.uint8)" % data)
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# Reorganise into a monochrome image, with the 96 8 x 8 characters
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# laid out in 8 rows by 12 columns for easier viewing/editing
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unpacked = np.unpackbits(packed)
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bitmaps = unpacked.reshape(96, 8, 8)
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indices = np.arange(96).reshape(8, 12)
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image = np.block([[bitmaps[idx] for idx in row] for row in indices])
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if mode == 'show':
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# Display font image
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imshow(image, cmap='binary')
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show()
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elif mode == 'extract':
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# Save font image
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imsave(image_file, image, format='png', cmap='binary')
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elif mode == 'insert':
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# Read in modified font image
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image = imread(image_file)[:,:,0].astype(bool)
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# Reorganise back to original order
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bitmaps = np.vstack([np.vstack(np.split(row, 12, 1))
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for row in np.split(image, 8)])
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unpacked = bitmaps.reshape(-1)
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packed = ~np.packbits(unpacked)
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# Replace lines of file in same format as used before
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grouped = packed.reshape(-1, 8)
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for i, group in enumerate(grouped):
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line = (" " + " 0x%02x," * 8) % tuple(group)
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lines[start + i] = line
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# Write out modified source file
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open(source_file, 'w').writelines([line + "\n" for line in lines])
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