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move the bdf_font_converter to the lv_utils repo
This commit is contained in:
Gabor Kiss-Vamosi
parent
a482132652
commit
c6d8f8ee28
@ -1,201 +0,0 @@
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#!/user/bin/env python
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'''
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Small utility that converts 1bpp BDF fonts to a font compatible with littlevgl
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'''
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# General imports
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import argparse
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import math
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class Glyph:
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def __init__(self, props ):
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for k, v in props.items():
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setattr(self, k, v)
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def __lt__(self, other):
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return self.encoding < other.encoding
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def get_width(self):
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return self.dwidth[0]
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def get_byte_width(self):
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# Compute how many bytes wide the glyph will be
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return math.ceil(self.dwidth[0] / 8.0)
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def get_height(self):
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return len(self.bitmap)
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def get_encoding(self):
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return self.encoding
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def write_bitmap(self, f):
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f.write('''/*Unicode: U+%04x ( %s ) , Width: %d */\n''' %
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(self.encoding, self.name, self.dwidth[0]) )
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for line in self.bitmap:
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for i in range(0, len(line), 2):
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f.write("0x%s," % line[i:i+2])
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if(i > 0):
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f.write(" ")
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f.write("\n")
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f.write("\n\n")
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def parse_bdf(fn):
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# Converts bdf file to a list of Glyphs
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# Read in BDF File
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with open(fn, "r") as f:
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bdf = f.readlines()
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bdf = [x.rstrip("\n") for x in bdf]
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# Iterate through BDF Glyphs
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glyphs = []
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i = -1
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while i < len(bdf):
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props = {}
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] == 'ENDFONT':
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break;
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if tokens[0] != "STARTCHAR":
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continue
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props['name'] = tokens[1]
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] != "ENCODING":
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continue
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encoding = int(tokens[-1])
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if encoding < 0: # skip glyphs with a negative encoding value
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continue
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props['encoding'] = encoding
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] != "SWIDTH":
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continue
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props['swidth'] = (int(tokens[1]), int(tokens[2]))
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] != "DWIDTH":
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continue
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props['dwidth'] = (int(tokens[1]), int(tokens[2]))
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] != "BBX":
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continue
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props['dwidth'] = (int(tokens[1]), int(tokens[2]),
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int(tokens[3]), int(tokens[4]))
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] != "BITMAP":
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continue
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props['bitmap'] = []
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while True:
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i += 1
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tokens = bdf[i].split(' ')
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if tokens[0] == 'ENDCHAR':
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break
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props['bitmap'].append(tokens[0])
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glyphs.append(Glyph(props))
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return glyphs
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def parse_args():
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''' Parse CLI arguments into an object and a dictionary '''
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parser = argparse.ArgumentParser()
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parser.add_argument('bdf_fn', type=str, default='imgs',
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help='BDF Filename')
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parser.add_argument('font_name', type=str, default='font_name',
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help='Name of the font to be generated')
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args = parser.parse_args()
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dargs = vars(args)
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return (args, dargs)
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def main():
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args, dargs = parse_args()
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glyphs = parse_bdf(args.bdf_fn)
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glyphs.sort() # Sorts by encoding (utf8) value
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################
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# WRITE HEADER #
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################
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out = open(args.font_name + '.c', "w")
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out.write('''
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#include "../lv_misc/lv_font.h"
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''')
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#################
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# WRITE BITMAPS #
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#################
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out.write(
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'''
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static const uint8_t %s_glyph_bitmap[] =
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{
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''' % args.font_name)
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for glyph in glyphs:
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glyph.write_bitmap(out)
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out.write('''
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};
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''')
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######################
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# WRITE DESCRIPTIONS #
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######################
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out.write(
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'''
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/*Store the glyph descriptions*/
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static const lv_font_glyph_dsc_t %s_glyph_dsc[] =
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{
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''' % args.font_name)
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glyph_index = 0
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for glyph in glyphs:
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out.write('''
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{.w_px = %d, .glyph_index = %d}, /*Unicode: U+%04x ( )*/
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''' % (glyph.get_width(), glyph_index, glyph.get_encoding()) )
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glyph_index += glyph.get_byte_width() * glyph.get_height()
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out.write('''
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};
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''')
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#####################
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# WRITE FONT STRUCT #
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#####################
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out.write(
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'''
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lv_font_t %s =
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{
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.unicode_first = %d, /*First Unicode letter in this font*/
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.unicode_last = %d, /*Last Unicode letter in this font*/
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.h_px = %d, /*Font height in pixels*/
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.glyph_bitmap = %s_glyph_bitmap, /*Bitmap of glyphs*/
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.glyph_dsc = %s_glyph_dsc, /*Description of glyphs*/
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.glyph_cnt = %d, /*Number of glyphs in the font*/
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.unicode_list = NULL, /*Every character in the font from 'unicode_first' to 'unicode_last'*/
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.get_bitmap = lv_font_get_bitmap_continuous, /*Function pointer to get glyph's bitmap*/
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.get_width = lv_font_get_width_continuous, /*Function pointer to get glyph's width*/
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.bpp = 1, /*Bit per pixel*/
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.monospace = 0, /*Fix width (0: if not used)*/
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.next_page = NULL, /*Pointer to a font extension*/
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};
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''' % (args.font_name,
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glyphs[0].get_encoding(),
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glyphs[-1].get_encoding(),
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glyphs[0].get_height(),
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args.font_name,
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args.font_name,
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len(glyphs),
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) )
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out.close()
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if __name__=='__main__':
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main()
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