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401 lines
15 KiB
401 lines
15 KiB
# Copyright 2021 Nick Brassel (@tzarc)
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Quantum Font File "QFF" Font File Format.
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# See https://docs.qmk.fm/#/quantum_painter_qff for more information.
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from pathlib import Path
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from typing import Dict, Any
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from colorsys import rgb_to_hsv
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from PIL import Image, ImageDraw, ImageFont, ImageChops
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from PIL._binary import o8, o16le as o16, o32le as o32
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from qmk.painter_qgf import QGFBlockHeader, QGFFramePaletteDescriptorV1
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from milc.attrdict import AttrDict
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import qmk.painter
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def o24(i):
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return o16(i & 0xFFFF) + o8((i & 0xFF0000) >> 16)
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########################################################################################################################
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class QFFGlyphInfo(AttrDict):
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def __init__(self, *args, **kwargs):
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super().__init__()
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for n, value in enumerate(args):
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self[f'arg:{n}'] = value
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for key, value in kwargs.items():
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self[key] = value
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def write(self, fp, include_code_point):
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if include_code_point is True:
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fp.write(o24(ord(self.code_point)))
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value = ((self.data_offset << 6) & 0xFFFFC0) | (self.w & 0x3F)
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fp.write(o24(value))
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########################################################################################################################
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class QFFFontDescriptor:
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type_id = 0x00
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length = 20
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magic = 0x464651
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def __init__(self):
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self.header = QGFBlockHeader()
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self.header.type_id = QFFFontDescriptor.type_id
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self.header.length = QFFFontDescriptor.length
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self.version = 1
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self.total_file_size = 0
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self.line_height = 0
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self.has_ascii_table = False
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self.unicode_glyph_count = 0
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self.format = 0xFF
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self.flags = 0
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self.compression = 0xFF
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self.transparency_index = 0xFF # TODO: Work out how to retrieve the transparent palette entry from the PIL gif loader
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def write(self, fp):
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self.header.write(fp)
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fp.write(
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b'' # start off with empty bytes...
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+ o24(QFFFontDescriptor.magic) # magic
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+ o8(self.version) # version
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+ o32(self.total_file_size) # file size
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+ o32((~self.total_file_size) & 0xFFFFFFFF) # negated file size
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+ o8(self.line_height) # line height
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+ o8(1 if self.has_ascii_table is True else 0) # whether or not we have an ascii table present
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+ o16(self.unicode_glyph_count & 0xFFFF) # number of unicode glyphs present
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+ o8(self.format) # format
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+ o8(self.flags) # flags
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+ o8(self.compression) # compression
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+ o8(self.transparency_index) # transparency index
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)
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@property
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def is_transparent(self):
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return (self.flags & 0x01) == 0x01
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@is_transparent.setter
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def is_transparent(self, val):
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if val:
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self.flags |= 0x01
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else:
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self.flags &= ~0x01
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########################################################################################################################
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class QFFAsciiGlyphTableV1:
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type_id = 0x01
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length = 95 * 3 # We have 95 glyphs: [0x20...0x7E]
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def __init__(self):
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self.header = QGFBlockHeader()
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self.header.type_id = QFFAsciiGlyphTableV1.type_id
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self.header.length = QFFAsciiGlyphTableV1.length
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# Each glyph is key=code_point, value=QFFGlyphInfo
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self.glyphs = {}
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def add_glyph(self, glyph: QFFGlyphInfo):
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self.glyphs[ord(glyph.code_point)] = glyph
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def write(self, fp):
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self.header.write(fp)
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for n in range(0x20, 0x7F):
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self.glyphs[n].write(fp, False)
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########################################################################################################################
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class QFFUnicodeGlyphTableV1:
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type_id = 0x02
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def __init__(self):
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self.header = QGFBlockHeader()
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self.header.type_id = QFFUnicodeGlyphTableV1.type_id
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self.header.length = 0
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# Each glyph is key=code_point, value=QFFGlyphInfo
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self.glyphs = {}
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def add_glyph(self, glyph: QFFGlyphInfo):
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self.glyphs[ord(glyph.code_point)] = glyph
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def write(self, fp):
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self.header.length = len(self.glyphs.keys()) * 6
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self.header.write(fp)
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for n in sorted(self.glyphs.keys()):
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self.glyphs[n].write(fp, True)
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########################################################################################################################
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class QFFFontDataDescriptorV1:
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type_id = 0x04
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def __init__(self):
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self.header = QGFBlockHeader()
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self.header.type_id = QFFFontDataDescriptorV1.type_id
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self.data = []
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def write(self, fp):
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self.header.length = len(self.data)
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self.header.write(fp)
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fp.write(bytes(self.data))
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########################################################################################################################
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def _generate_font_glyphs_list(use_ascii, unicode_glyphs):
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# The set of glyphs that we want to generate images for
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glyphs = {}
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# Add ascii charset if requested
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if use_ascii is True:
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for c in range(0x20, 0x7F): # does not include 0x7F!
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glyphs[chr(c)] = True
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# Append any extra unicode glyphs
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unicode_glyphs = list(unicode_glyphs)
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for c in unicode_glyphs:
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glyphs[c] = True
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return sorted(glyphs.keys())
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class QFFFont:
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def __init__(self, logger):
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self.logger = logger
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self.image = None
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self.glyph_data = {}
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self.glyph_height = 0
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return
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def _extract_glyphs(self, format):
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total_data_size = 0
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total_rle_data_size = 0
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converted_img = qmk.painter.convert_requested_format(self.image, format)
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(self.palette, _) = qmk.painter.convert_image_bytes(converted_img, format)
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# Work out how many bytes used for RLE vs. non-RLE
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for _, glyph_entry in self.glyph_data.items():
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glyph_img = converted_img.crop((glyph_entry.x, 1, glyph_entry.x + glyph_entry.w, 1 + self.glyph_height))
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(_, this_glyph_image_bytes) = qmk.painter.convert_image_bytes(glyph_img, format)
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this_glyph_rle_bytes = qmk.painter.compress_bytes_qmk_rle(this_glyph_image_bytes)
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total_data_size += len(this_glyph_image_bytes)
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total_rle_data_size += len(this_glyph_rle_bytes)
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glyph_entry['image_uncompressed_bytes'] = this_glyph_image_bytes
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glyph_entry['image_compressed_bytes'] = this_glyph_rle_bytes
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return (total_data_size, total_rle_data_size)
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def _parse_image(self, img, include_ascii_glyphs: bool = True, unicode_glyphs: str = ''):
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# Clear out any existing font metadata
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self.image = None
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# Each glyph is key=code_point, value={ x: ?, w: ? }
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self.glyph_data = {}
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self.glyph_height = 0
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# Work out the list of glyphs required
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glyphs = _generate_font_glyphs_list(include_ascii_glyphs, unicode_glyphs)
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# Work out the geometry
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(width, height) = img.size
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# Work out the glyph offsets/widths
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glyph_pixel_offsets = []
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glyph_pixel_widths = []
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pixels = img.load()
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# Run through the markers and work out where each glyph starts/stops
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glyph_split_color = pixels[0, 0] # top left pixel is the marker color we're going to use to split each glyph
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glyph_pixel_offsets.append(0)
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last_offset = 0
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for x in range(1, width):
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if pixels[x, 0] == glyph_split_color:
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glyph_pixel_offsets.append(x)
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glyph_pixel_widths.append(x - last_offset)
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last_offset = x
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glyph_pixel_widths.append(width - last_offset)
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# Make sure the number of glyphs we're attempting to generate matches the input image
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if len(glyph_pixel_offsets) != len(glyphs):
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self.logger.error('The number of glyphs to generate doesn\'t match the number of detected glyphs in the input image.')
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return
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# Set up the required metadata for each glyph
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for n in range(0, len(glyph_pixel_offsets)):
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self.glyph_data[glyphs[n]] = QFFGlyphInfo(code_point=glyphs[n], x=glyph_pixel_offsets[n], w=glyph_pixel_widths[n])
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# Parsing was successful, keep the image in this instance
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self.image = img
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self.glyph_height = height - 1 # subtract the line with the markers
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def generate_image(self, ttf_file: Path, font_size: int, include_ascii_glyphs: bool = True, unicode_glyphs: str = '', include_before_left: bool = False, use_aa: bool = True):
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# Load the font
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font = ImageFont.truetype(str(ttf_file), int(font_size))
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# Work out the max font size
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max_font_size = font.font.ascent + abs(font.font.descent)
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# Work out the list of glyphs required
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glyphs = _generate_font_glyphs_list(include_ascii_glyphs, unicode_glyphs)
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baseline_offset = 9999999
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total_glyph_width = 0
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max_glyph_height = -1
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# Measure each glyph to determine the overall baseline offset required
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for glyph in glyphs:
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(ls_l, ls_t, ls_r, ls_b) = font.getbbox(glyph, anchor='ls')
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glyph_width = (ls_r - ls_l) if include_before_left else (ls_r)
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glyph_height = font.getbbox(glyph, anchor='la')[3]
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if max_glyph_height < glyph_height:
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max_glyph_height = glyph_height
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total_glyph_width += glyph_width
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if baseline_offset > ls_t:
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baseline_offset = ls_t
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# Create the output image
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img = Image.new("RGB", (total_glyph_width + 1, max_font_size * 2 + 1), (0, 0, 0, 255))
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cur_x_pos = 0
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# Loop through each glyph...
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for glyph in glyphs:
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# Work out this glyph's bounding box
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(ls_l, ls_t, ls_r, ls_b) = font.getbbox(glyph, anchor='ls')
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glyph_width = (ls_r - ls_l) if include_before_left else (ls_r)
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glyph_height = ls_b - ls_t
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x_offset = -ls_l
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y_offset = ls_t - baseline_offset
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# Draw each glyph to its own image so we don't get anti-aliasing applied to the final image when straddling edges
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glyph_img = Image.new("RGB", (glyph_width, max_font_size), (0, 0, 0, 255))
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glyph_draw = ImageDraw.Draw(glyph_img)
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if not use_aa:
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glyph_draw.fontmode = "1"
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glyph_draw.text((x_offset, y_offset), glyph, font=font, anchor='lt')
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# Place the glyph-specific image in the correct location overall
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img.paste(glyph_img, (cur_x_pos, 1))
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# Set up the marker for start of each glyph
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pixels = img.load()
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pixels[cur_x_pos, 0] = (255, 0, 255)
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# Increment for the next glyph's position
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cur_x_pos += glyph_width
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# Add the ending marker so that the difference/crop works
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pixels = img.load()
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pixels[cur_x_pos, 0] = (255, 0, 255)
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# Determine the usable font area
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dummy_img = Image.new("RGB", (total_glyph_width + 1, max_font_size + 1), (0, 0, 0, 255))
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bbox = ImageChops.difference(img, dummy_img).getbbox()
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bbox = (bbox[0], bbox[1], bbox[2] - 1, bbox[3]) # remove the unused end-marker
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# Crop and re-parse the resulting image to ensure we're generating the correct format
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self._parse_image(img.crop(bbox), include_ascii_glyphs, unicode_glyphs)
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def save_to_image(self, img_file: Path):
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# Drop out if there's no image loaded
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if self.image is None:
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self.logger.error('No image is loaded.')
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return
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# Save the image to the supplied file
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self.image.save(str(img_file))
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def read_from_image(self, img_file: Path, include_ascii_glyphs: bool = True, unicode_glyphs: str = ''):
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# Load and parse the supplied image file
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self._parse_image(Image.open(str(img_file)), include_ascii_glyphs, unicode_glyphs)
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return
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def save_to_qff(self, format: Dict[str, Any], use_rle: bool, fp):
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# Drop out if there's no image loaded
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if self.image is None:
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self.logger.error('No image is loaded.')
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return
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# Work out if we want to use RLE at all, skipping it if it's not any smaller (it's applied per-glyph)
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(total_data_size, total_rle_data_size) = self._extract_glyphs(format)
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if use_rle:
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use_rle = (total_rle_data_size < total_data_size)
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# For each glyph, work out which image data we want to use and append it to the image buffer, recording the byte-wise offset
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img_buffer = bytes()
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for _, glyph_entry in self.glyph_data.items():
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glyph_entry['data_offset'] = len(img_buffer)
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glyph_img_bytes = glyph_entry.image_compressed_bytes if use_rle else glyph_entry.image_uncompressed_bytes
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img_buffer += bytes(glyph_img_bytes)
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font_descriptor = QFFFontDescriptor()
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ascii_table = QFFAsciiGlyphTableV1()
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unicode_table = QFFUnicodeGlyphTableV1()
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data_descriptor = QFFFontDataDescriptorV1()
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data_descriptor.data = img_buffer
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# Check if we have all the ASCII glyphs present
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include_ascii_glyphs = all([chr(n) in self.glyph_data for n in range(0x20, 0x7F)])
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# Helper for populating the blocks
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for code_point, glyph_entry in self.glyph_data.items():
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if ord(code_point) >= 0x20 and ord(code_point) <= 0x7E and include_ascii_glyphs:
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ascii_table.add_glyph(glyph_entry)
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else:
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unicode_table.add_glyph(glyph_entry)
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# Configure the font descriptor
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font_descriptor.line_height = self.glyph_height
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font_descriptor.has_ascii_table = include_ascii_glyphs
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font_descriptor.unicode_glyph_count = len(unicode_table.glyphs.keys())
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font_descriptor.is_transparent = False
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font_descriptor.format = format['image_format_byte']
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font_descriptor.compression = 0x01 if use_rle else 0x00
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# Write a dummy font descriptor -- we'll have to come back and write it properly once we've rendered out everything else
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font_descriptor_location = fp.tell()
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font_descriptor.write(fp)
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# Write out the ASCII table if required
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if font_descriptor.has_ascii_table:
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ascii_table.write(fp)
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# Write out the unicode table if required
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if font_descriptor.unicode_glyph_count > 0:
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unicode_table.write(fp)
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# Write out the palette if required
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if format['has_palette']:
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palette_descriptor = QGFFramePaletteDescriptorV1()
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# Helper to convert from RGB888 to the QMK "dialect" of HSV888
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def rgb888_to_qmk_hsv888(e):
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hsv = rgb_to_hsv(e[0] / 255.0, e[1] / 255.0, e[2] / 255.0)
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return (int(hsv[0] * 255.0), int(hsv[1] * 255.0), int(hsv[2] * 255.0))
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# Convert all palette entries to HSV888 and write to the output
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palette_descriptor.palette_entries = list(map(rgb888_to_qmk_hsv888, self.palette))
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palette_descriptor.write(fp)
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# Write out the image data
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data_descriptor.write(fp)
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# Now fix up the overall font descriptor, then write it in the correct location
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font_descriptor.total_file_size = fp.tell()
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fp.seek(font_descriptor_location, 0)
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font_descriptor.write(fp)
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