264 lines
8.6 KiB
Python
Executable File
264 lines
8.6 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (c) 2018 Henrik Brix Andersen <henrik@brixandersen.dk>
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#
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# SPDX-License-Identifier: Apache-2.0
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import argparse
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import sys
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from PIL import ImageFont
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from PIL import Image
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from PIL import ImageDraw
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PRINTABLE_MIN = 32
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PRINTABLE_MAX = 126
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def generate_element(image, charcode):
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"""Generate CFB font element for a given character code from an image"""
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blackwhite = image.convert("1", dither=Image.NONE)
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pixels = blackwhite.load()
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width, height = image.size
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if args.dump:
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blackwhite.save("{}_{}.png".format(args.name, charcode))
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if PRINTABLE_MIN <= charcode <= PRINTABLE_MAX:
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char = " ({:c})".format(charcode)
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else:
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char = ""
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args.output.write("""\t/* {:d}{} */\n\t{{\n""".format(charcode, char))
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glyph = []
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if args.hpack:
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for row in range(0, height):
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packed = []
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for octet in range(0, int(width / 8)):
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value = ""
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for bit in range(0, 8):
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col = octet * 8 + bit
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if pixels[col, row]:
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value = value + "0"
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else:
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value = value + "1"
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packed.append(value)
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glyph.append(packed)
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else:
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for col in range(0, width):
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packed = []
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for octet in range(0, int(height / 8)):
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value = ""
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for bit in range(0, 8):
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row = octet * 8 + bit
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if pixels[col, row]:
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value = value + "0"
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else:
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value = value + "1"
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packed.append(value)
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glyph.append(packed)
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for packed in glyph:
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args.output.write("\t\t")
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bits = []
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for value in packed:
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bits.append(value)
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if not args.msb_first:
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value = value[::-1]
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args.output.write("0x{:02x},".format(int(value, 2)))
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args.output.write(" /* {} */\n".format(''.join(bits).replace('0', ' ').replace('1', '#')))
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args.output.write("\t},\n")
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def extract_font_glyphs():
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"""Extract font glyphs from a TrueType/OpenType font file"""
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font = ImageFont.truetype(args.input, args.size)
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# Figure out the bounding box for the desired glyphs
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fw_max = 0
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fh_max = 0
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for i in range(args.first, args.last + 1):
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fw, fh = font.getsize(chr(i))
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if fw > fw_max:
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fw_max = fw
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if fh > fh_max:
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fh_max = fh
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# Round the packed length up to pack into bytes.
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if args.hpack:
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width = 8 * int((fw_max + 7) / 8)
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height = fh_max + args.y_offset
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else:
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width = fw_max
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height = 8 * int((fh_max + args.y_offset + 7) / 8)
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# Diagnose inconsistencies with arguments
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if width != args.width:
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raise Exception('text width {} mismatch with -x {}'.format(width, args.width))
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if height != args.height:
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raise Exception('text height {} mismatch with -y {}'.format(height, args.height))
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for i in range(args.first, args.last + 1):
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image = Image.new('1', (width, height), 'white')
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draw = ImageDraw.Draw(image)
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fw, fh = draw.textsize(chr(i), font=font)
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xpos = 0
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if args.center_x:
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xpos = (width - fw) / 2 + 1
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ypos = args.y_offset
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draw.text((xpos, ypos), chr(i), font=font)
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generate_element(image, i)
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def extract_image_glyphs():
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"""Extract font glyphs from an image file"""
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image = Image.open(args.input)
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x_offset = 0
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for i in range(args.first, args.last + 1):
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glyph = image.crop((x_offset, 0, x_offset + args.width, args.height))
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generate_element(glyph, i)
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x_offset += args.width
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def generate_header():
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"""Generate CFB font header file"""
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caps = []
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if args.hpack:
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caps.append('MONO_HPACKED')
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else:
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caps.append('MONO_VPACKED')
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if args.msb_first:
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caps.append('MSB_FIRST')
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caps = ' | '.join(['CFB_FONT_' + f for f in caps])
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clean_cmd = []
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for arg in sys.argv:
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if arg.startswith("--bindir"):
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# Drop. Assumes --bindir= was passed with '=' sign.
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continue
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if args.bindir and arg.startswith(args.bindir):
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# +1 to also strip '/' or '\' separator
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striplen = min(len(args.bindir)+1, len(arg))
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clean_cmd.append(arg[striplen:])
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continue
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if args.zephyr_base is not None:
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clean_cmd.append(arg.replace(args.zephyr_base, '"${ZEPHYR_BASE}"'))
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else:
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clean_cmd.append(arg)
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args.output.write("""/*
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* This file was automatically generated using the following command:
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* {cmd}
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*
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*/
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#include <zephyr.h>
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#include <display/cfb.h>
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static const u8_t cfb_font_{name:s}_{width:d}{height:d}[{elem:d}][{b:.0f}] = {{\n"""
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.format(cmd=" ".join(clean_cmd),
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name=args.name,
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width=args.width,
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height=args.height,
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elem=args.last - args.first + 1,
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b=args.width / 8 * args.height))
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if args.type == "font":
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extract_font_glyphs()
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elif args.type == "image":
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extract_image_glyphs()
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elif args.input.name.lower().endswith((".otf", ".otc", ".ttf", ".ttc")):
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extract_font_glyphs()
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else:
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extract_image_glyphs()
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args.output.write("""
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}};
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FONT_ENTRY_DEFINE({name}_{width}{height},
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{width},
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{height},
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{caps},
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cfb_font_{name}_{width}{height},
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{first},
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{last}
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);
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""" .format(name=args.name, width=args.width, height=args.height,
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caps=caps, first=args.first, last=args.last))
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def parse_args():
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"""Parse arguments"""
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global args
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parser = argparse.ArgumentParser(
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description="Character Frame Buffer (CFB) font header file generator",
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument(
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"-z", "--zephyr-base",
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help="Zephyr base directory")
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parser.add_argument(
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"-d", "--dump", action="store_true",
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help="dump generated CFB font elements as images for preview")
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group = parser.add_argument_group("input arguments")
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group.add_argument(
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"-i", "--input", required=True, type=argparse.FileType('rb'), metavar="FILE",
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help="TrueType/OpenType file or image input file")
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group.add_argument(
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"-t", "--type", default="auto", choices=["auto", "font", "image"],
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help="Input file type (default: %(default)s)")
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group = parser.add_argument_group("font arguments")
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group.add_argument(
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"-s", "--size", type=int, default=10, metavar="POINTS",
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help="TrueType/OpenType font size in points (default: %(default)s)")
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group = parser.add_argument_group("output arguments")
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group.add_argument(
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"-o", "--output", type=argparse.FileType('w'), default="-", metavar="FILE",
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help="CFB font header file (default: stdout)")
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group.add_argument(
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"--bindir", type=str,
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help="CMAKE_BINARY_DIR for pure logging purposes. No trailing slash.")
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group.add_argument(
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"-x", "--width", required=True, type=int,
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help="width of the CFB font elements in pixels")
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group.add_argument(
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"-y", "--height", required=True, type=int,
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help="height of the CFB font elements in pixels")
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group.add_argument(
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"-n", "--name", default="custom",
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help="name of the CFB font entry (default: %(default)s)")
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group.add_argument(
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"--first", type=int, default=PRINTABLE_MIN, metavar="CHARCODE",
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help="character code mapped to the first CFB font element (default: %(default)s)")
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group.add_argument(
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"--last", type=int, default=PRINTABLE_MAX, metavar="CHARCODE",
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help="character code mapped to the last CFB font element (default: %(default)s)")
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group.add_argument(
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"--center-x", action='store_true',
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help="center character glyphs horizontally")
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group.add_argument(
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"--y-offset", type=int, default=0,
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help="vertical offset for character glyphs (default: %(default)s)")
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group.add_argument(
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"--hpack", dest='hpack', default=False, action='store_true',
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help="generate bytes encoding row data rather than column data (default: %(default)s)")
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group.add_argument(
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"--msb-first", action='store_true',
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help="packed content starts at high bit of each byte (default: lsb-first)")
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args = parser.parse_args()
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def main():
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"""Parse arguments and generate CFB font header file"""
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parse_args()
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generate_header()
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if __name__ == "__main__":
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main()
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