7 files changed, 1255 insertions, 1 deletions

diff --git a/lib/python/qmk/cli/__init__.py b/lib/python/qmk/cli/__init__.py
index 5f65e677e5..85baa238a8 100644
--- a/lib/python/qmk/cli/__init__.py
+++ b/lib/python/qmk/cli/__init__.py
@@ -16,7 +16,8 @@ import_names = {
     # A mapping of package name to importable name
     'pep8-naming': 'pep8ext_naming',
     'pyusb': 'usb.core',
-    'qmk-dotty-dict': 'dotty_dict'
+    'qmk-dotty-dict': 'dotty_dict',
+    'pillow': 'PIL'
 }
 
 safe_commands = [
@@ -67,6 +68,7 @@ subcommands = [
     'qmk.cli.multibuild',
     'qmk.cli.new.keyboard',
     'qmk.cli.new.keymap',
+    'qmk.cli.painter',
     'qmk.cli.pyformat',
     'qmk.cli.pytest',
     'qmk.cli.via2json',
diff --git a/lib/python/qmk/cli/painter/__init__.py b/lib/python/qmk/cli/painter/__init__.py
new file mode 100644
index 0000000000..d1a225346c
--- /dev/null
+++ b/lib/python/qmk/cli/painter/__init__.py
@@ -0,0 +1,2 @@
+from . import convert_graphics
+from . import make_font
diff --git a/lib/python/qmk/cli/painter/convert_graphics.py b/lib/python/qmk/cli/painter/convert_graphics.py
new file mode 100644
index 0000000000..bbc30d26ff
--- /dev/null
+++ b/lib/python/qmk/cli/painter/convert_graphics.py
@@ -0,0 +1,86 @@
+"""This script tests QGF functionality.
+"""
+import re
+import datetime
+from io import BytesIO
+from qmk.path import normpath
+from qmk.painter import render_header, render_source, render_license, render_bytes, valid_formats
+from milc import cli
+from PIL import Image
+
+
+@cli.argument('-v', '--verbose', arg_only=True, action='store_true', help='Turns on verbose output.')
+@cli.argument('-i', '--input', required=True, help='Specify input graphic file.')
+@cli.argument('-o', '--output', default='', help='Specify output directory. Defaults to same directory as input.')
+@cli.argument('-f', '--format', required=True, help='Output format, valid types: %s' % (', '.join(valid_formats.keys())))
+@cli.argument('-r', '--no-rle', arg_only=True, action='store_true', help='Disables the use of RLE when encoding images.')
+@cli.argument('-d', '--no-deltas', arg_only=True, action='store_true', help='Disables the use of delta frames when encoding animations.')
+@cli.subcommand('Converts an input image to something QMK understands')
+def painter_convert_graphics(cli):
+    """Converts an image file to a format that Quantum Painter understands.
+
+    This command uses the `qmk.painter` module to generate a Quantum Painter image defintion from an image. The generated definitions are written to a files next to the input -- `INPUT.c` and `INPUT.h`.
+    """
+    # Work out the input file
+    if cli.args.input != '-':
+        cli.args.input = normpath(cli.args.input)
+
+        # Error checking
+        if not cli.args.input.exists():
+            cli.log.error('Input image file does not exist!')
+            cli.print_usage()
+            return False
+
+    # Work out the output directory
+    if len(cli.args.output) == 0:
+        cli.args.output = cli.args.input.parent
+    cli.args.output = normpath(cli.args.output)
+
+    # Ensure we have a valid format
+    if cli.args.format not in valid_formats.keys():
+        cli.log.error('Output format %s is invalid. Allowed values: %s' % (cli.args.format, ', '.join(valid_formats.keys())))
+        cli.print_usage()
+        return False
+
+    # Work out the encoding parameters
+    format = valid_formats[cli.args.format]
+
+    # Load the input image
+    input_img = Image.open(cli.args.input)
+
+    # Convert the image to QGF using PIL
+    out_data = BytesIO()
+    input_img.save(out_data, "QGF", use_deltas=(not cli.args.no_deltas), use_rle=(not cli.args.no_rle), qmk_format=format, verbose=cli.args.verbose)
+    out_bytes = out_data.getvalue()
+
+    # Work out the text substitutions for rendering the output data
+    subs = {
+        'generated_type': 'image',
+        'var_prefix': 'gfx',
+        'generator_command': f'qmk painter-convert-graphics -i {cli.args.input.name} -f {cli.args.format}',
+        'year': datetime.date.today().strftime("%Y"),
+        'input_file': cli.args.input.name,
+        'sane_name': re.sub(r"[^a-zA-Z0-9]", "_", cli.args.input.stem),
+        'byte_count': len(out_bytes),
+        'bytes_lines': render_bytes(out_bytes),
+        'format': cli.args.format,
+    }
+
+    # Render the license
+    subs.update({'license': render_license(subs)})
+
+    # Render and write the header file
+    header_text = render_header(subs)
+    header_file = cli.args.output / (cli.args.input.stem + ".qgf.h")
+    with open(header_file, 'w') as header:
+        print(f"Writing {header_file}...")
+        header.write(header_text)
+        header.close()
+
+    # Render and write the source file
+    source_text = render_source(subs)
+    source_file = cli.args.output / (cli.args.input.stem + ".qgf.c")
+    with open(source_file, 'w') as source:
+        print(f"Writing {source_file}...")
+        source.write(source_text)
+        source.close()
diff --git a/lib/python/qmk/cli/painter/make_font.py b/lib/python/qmk/cli/painter/make_font.py
new file mode 100644
index 0000000000..0762843fd3
--- /dev/null
+++ b/lib/python/qmk/cli/painter/make_font.py
@@ -0,0 +1,87 @@
+"""This script automates the conversion of font files into a format QMK firmware understands.
+"""
+
+import re
+import datetime
+from io import BytesIO
+from qmk.path import normpath
+from qmk.painter_qff import QFFFont
+from qmk.painter import render_header, render_source, render_license, render_bytes, valid_formats
+from milc import cli
+
+
+@cli.argument('-f', '--font', required=True, help='Specify input font file.')
+@cli.argument('-o', '--output', required=True, help='Specify output image path.')
+@cli.argument('-s', '--size', default=12, help='Specify font size. Default 12.')
+@cli.argument('-n', '--no-ascii', arg_only=True, action='store_true', help='Disables output of the full ASCII character set (0x20..0x7E), exporting only the glyphs specified.')
+@cli.argument('-u', '--unicode-glyphs', default='', help='Also generate the specified unicode glyphs.')
+@cli.argument('-a', '--no-aa', arg_only=True, action='store_true', help='Disable anti-aliasing on fonts.')
+@cli.subcommand('Converts an input font to something QMK understands')
+def painter_make_font_image(cli):
+    # Create the font object
+    font = QFFFont(cli)
+    # Read from the input file
+    cli.args.font = normpath(cli.args.font)
+    font.generate_image(cli.args.font, cli.args.size, include_ascii_glyphs=(not cli.args.no_ascii), unicode_glyphs=cli.args.unicode_glyphs, use_aa=(False if cli.args.no_aa else True))
+    # Render out the data
+    font.save_to_image(normpath(cli.args.output))
+
+
+@cli.argument('-i', '--input', help='Specify input graphic file.')
+@cli.argument('-o', '--output', default='', help='Specify output directory. Defaults to same directory as input.')
+@cli.argument('-n', '--no-ascii', arg_only=True, action='store_true', help='Disables output of the full ASCII character set (0x20..0x7E), exporting only the glyphs specified.')
+@cli.argument('-u', '--unicode-glyphs', default='', help='Also generate the specified unicode glyphs.')
+@cli.argument('-f', '--format', required=True, help='Output format, valid types: %s' % (', '.join(valid_formats.keys())))
+@cli.argument('-r', '--no-rle', arg_only=True, action='store_true', help='Disable the use of RLE to minimise converted image size.')
+@cli.subcommand('Converts an input font image to something QMK firmware understands')
+def painter_convert_font_image(cli):
+    # Work out the format
+    format = valid_formats[cli.args.format]
+
+    # Create the font object
+    font = QFFFont(cli.log)
+
+    # Read from the input file
+    cli.args.input = normpath(cli.args.input)
+    font.read_from_image(cli.args.input, include_ascii_glyphs=(not cli.args.no_ascii), unicode_glyphs=cli.args.unicode_glyphs)
+
+    # Work out the output directory
+    if len(cli.args.output) == 0:
+        cli.args.output = cli.args.input.parent
+    cli.args.output = normpath(cli.args.output)
+
+    # Render out the data
+    out_data = BytesIO()
+    font.save_to_qff(format, (False if cli.args.no_rle else True), out_data)
+
+    # Work out the text substitutions for rendering the output data
+    subs = {
+        'generated_type': 'font',
+        'var_prefix': 'font',
+        'generator_command': f'qmk painter-convert-font-image -i {cli.args.input.name} -f {cli.args.format}',
+        'year': datetime.date.today().strftime("%Y"),
+        'input_file': cli.args.input.name,
+        'sane_name': re.sub(r"[^a-zA-Z0-9]", "_", cli.args.input.stem),
+        'byte_count': out_data.getbuffer().nbytes,
+        'bytes_lines': render_bytes(out_data.getbuffer().tobytes()),
+        'format': cli.args.format,
+    }
+
+    # Render the license
+    subs.update({'license': render_license(subs)})
+
+    # Render and write the header file
+    header_text = render_header(subs)
+    header_file = cli.args.output / (cli.args.input.stem + ".qff.h")
+    with open(header_file, 'w') as header:
+        print(f"Writing {header_file}...")
+        header.write(header_text)
+        header.close()
+
+    # Render and write the source file
+    source_text = render_source(subs)
+    source_file = cli.args.output / (cli.args.input.stem + ".qff.c")
+    with open(source_file, 'w') as source:
+        print(f"Writing {source_file}...")
+        source.write(source_text)
+        source.close()
diff --git a/lib/python/qmk/painter.py b/lib/python/qmk/painter.py
new file mode 100644
index 0000000000..d0cc1dddec
--- /dev/null
+++ b/lib/python/qmk/painter.py
@@ -0,0 +1,268 @@
+"""Functions that help us work with Quantum Painter's file formats.
+"""
+import math
+import re
+from string import Template
+from PIL import Image, ImageOps
+
+# The list of valid formats Quantum Painter supports
+valid_formats = {
+    'pal256': {
+        'image_format': 'IMAGE_FORMAT_PALETTE',
+        'bpp': 8,
+        'has_palette': True,
+        'num_colors': 256,
+        'image_format_byte': 0x07,  # see qp_internal_formats.h
+    },
+    'pal16': {
+        'image_format': 'IMAGE_FORMAT_PALETTE',
+        'bpp': 4,
+        'has_palette': True,
+        'num_colors': 16,
+        'image_format_byte': 0x06,  # see qp_internal_formats.h
+    },
+    'pal4': {
+        'image_format': 'IMAGE_FORMAT_PALETTE',
+        'bpp': 2,
+        'has_palette': True,
+        'num_colors': 4,
+        'image_format_byte': 0x05,  # see qp_internal_formats.h
+    },
+    'pal2': {
+        'image_format': 'IMAGE_FORMAT_PALETTE',
+        'bpp': 1,
+        'has_palette': True,
+        'num_colors': 2,
+        'image_format_byte': 0x04,  # see qp_internal_formats.h
+    },
+    'mono256': {
+        'image_format': 'IMAGE_FORMAT_GRAYSCALE',
+        'bpp': 8,
+        'has_palette': False,
+        'num_colors': 256,
+        'image_format_byte': 0x03,  # see qp_internal_formats.h
+    },
+    'mono16': {
+        'image_format': 'IMAGE_FORMAT_GRAYSCALE',
+        'bpp': 4,
+        'has_palette': False,
+        'num_colors': 16,
+        'image_format_byte': 0x02,  # see qp_internal_formats.h
+    },
+    'mono4': {
+        'image_format': 'IMAGE_FORMAT_GRAYSCALE',
+        'bpp': 2,
+        'has_palette': False,
+        'num_colors': 4,
+        'image_format_byte': 0x01,  # see qp_internal_formats.h
+    },
+    'mono2': {
+        'image_format': 'IMAGE_FORMAT_GRAYSCALE',
+        'bpp': 1,
+        'has_palette': False,
+        'num_colors': 2,
+        'image_format_byte': 0x00,  # see qp_internal_formats.h
+    }
+}
+
+license_template = """\
+// Copyright ${year} QMK -- generated source code only, ${generated_type} retains original copyright
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+// This file was auto-generated by `${generator_command}`
+"""
+
+
+def render_license(subs):
+    license_txt = Template(license_template)
+    return license_txt.substitute(subs)
+
+
+header_file_template = """\
+${license}
+#pragma once
+
+#include <qp.h>
+
+extern const uint32_t ${var_prefix}_${sane_name}_length;
+extern const uint8_t  ${var_prefix}_${sane_name}[${byte_count}];
+"""
+
+
+def render_header(subs):
+    header_txt = Template(header_file_template)
+    return header_txt.substitute(subs)
+
+
+source_file_template = """\
+${license}
+#include <qp.h>
+
+const uint32_t ${var_prefix}_${sane_name}_length = ${byte_count};
+
+// clang-format off
+const uint8_t ${var_prefix}_${sane_name}[${byte_count}] = {
+${bytes_lines}
+};
+// clang-format on
+"""
+
+
+def render_source(subs):
+    source_txt = Template(source_file_template)
+    return source_txt.substitute(subs)
+
+
+def render_bytes(bytes, newline_after=16):
+    lines = ''
+    for n in range(len(bytes)):
+        if n % newline_after == 0 and n > 0 and n != len(bytes):
+            lines = lines + "\n   "
+        elif n == 0:
+            lines = lines + "   "
+        lines = lines + " 0x{0:02X},".format(bytes[n])
+    return lines.rstrip()
+
+
+def clean_output(str):
+    str = re.sub(r'\r', '', str)
+    str = re.sub(r'[\n]{3,}', r'\n\n', str)
+    return str
+
+
+def rescale_byte(val, maxval):
+    """Rescales a byte value to the supplied range, i.e. [0,255] -> [0,maxval].
+    """
+    return int(round(val * maxval / 255.0))
+
+
+def convert_requested_format(im, format):
+    """Convert an image to the requested format.
+    """
+
+    # Work out the requested format
+    ncolors = format["num_colors"]
+    image_format = format["image_format"]
+
+    # Ensure we have a valid number of colors for the palette
+    if ncolors <= 0 or ncolors > 256 or (ncolors & (ncolors - 1) != 0):
+        raise ValueError("Number of colors must be 2, 4, 16, or 256.")
+
+    # Work out where we're getting the bytes from
+    if image_format == 'IMAGE_FORMAT_GRAYSCALE':
+        # If mono, convert input to grayscale, then to RGB, then grab the raw bytes corresponding to the intensity of the red channel
+        im = ImageOps.grayscale(im)
+        im = im.convert("RGB")
+    elif image_format == 'IMAGE_FORMAT_PALETTE':
+        # If color, convert input to RGB, palettize based on the supplied number of colors, then get the raw palette bytes
+        im = im.convert("RGB")
+        im = im.convert("P", palette=Image.ADAPTIVE, colors=ncolors)
+
+    return im
+
+
+def convert_image_bytes(im, format):
+    """Convert the supplied image to the equivalent bytes required by the QMK firmware.
+    """
+
+    # Work out the requested format
+    ncolors = format["num_colors"]
+    image_format = format["image_format"]
+    shifter = int(math.log2(ncolors))
+    pixels_per_byte = int(8 / math.log2(ncolors))
+    (width, height) = im.size
+    expected_byte_count = ((width * height) + (pixels_per_byte - 1)) // pixels_per_byte
+
+    if image_format == 'IMAGE_FORMAT_GRAYSCALE':
+        # Take the red channel
+        image_bytes = im.tobytes("raw", "R")
+        image_bytes_len = len(image_bytes)
+
+        # No palette
+        palette = None
+
+        bytearray = []
+        for x in range(expected_byte_count):
+            byte = 0
+            for n in range(pixels_per_byte):
+                byte_offset = x * pixels_per_byte + n
+                if byte_offset < image_bytes_len:
+                    # If mono, each input byte is a grayscale [0,255] pixel -- rescale to the range we want then pack together
+                    byte = byte | (rescale_byte(image_bytes[byte_offset], ncolors - 1) << int(n * shifter))
+            bytearray.append(byte)
+
+    elif image_format == 'IMAGE_FORMAT_PALETTE':
+        # Convert each pixel to the palette bytes
+        image_bytes = im.tobytes("raw", "P")
+        image_bytes_len = len(image_bytes)
+
+        # Export the palette
+        palette = []
+        pal = im.getpalette()
+        for n in range(0, ncolors * 3, 3):
+            palette.append((pal[n + 0], pal[n + 1], pal[n + 2]))
+
+        bytearray = []
+        for x in range(expected_byte_count):
+            byte = 0
+            for n in range(pixels_per_byte):
+                byte_offset = x * pixels_per_byte + n
+                if byte_offset < image_bytes_len:
+                    # If color, each input byte is the index into the color palette -- pack them together
+                    byte = byte | ((image_bytes[byte_offset] & (ncolors - 1)) << int(n * shifter))
+            bytearray.append(byte)
+
+    if len(bytearray) != expected_byte_count:
+        raise Exception(f"Wrong byte count, was {len(bytearray)}, expected {expected_byte_count}")
+
+    return (palette, bytearray)
+
+
+def compress_bytes_qmk_rle(bytearray):
+    debug_dump = False
+    output = []
+    temp = []
+    repeat = False
+
+    def append_byte(c):
+        if debug_dump:
+            print('Appending byte:', '0x{0:02X}'.format(int(c)), '=', c)
+        output.append(c)
+
+    def append_range(r):
+        append_byte(127 + len(r))
+        if debug_dump:
+            print('Appending {0} byte(s):'.format(len(r)), '[', ', '.join(['{0:02X}'.format(e) for e in r]), ']')
+        output.extend(r)
+
+    for n in range(0, len(bytearray) + 1):
+        end = True if n == len(bytearray) else False
+        if not end:
+            c = bytearray[n]
+            temp.append(c)
+            if len(temp) <= 1:
+                continue
+
+        if debug_dump:
+            print('Temp buffer state {0:3d} bytes:'.format(len(temp)), '[', ', '.join(['{0:02X}'.format(e) for e in temp]), ']')
+
+        if repeat:
+            if temp[-1] != temp[-2]:
+                repeat = False
+            if not repeat or len(temp) == 128 or end:
+                append_byte(len(temp) if end else len(temp) - 1)
+                append_byte(temp[0])
+                temp = [temp[-1]]
+                repeat = False
+        else:
+            if len(temp) >= 2 and temp[-1] == temp[-2]:
+                repeat = True
+                if len(temp) > 2:
+                    append_range(temp[0:(len(temp) - 2)])
+                    temp = [temp[-1], temp[-1]]
+                continue
+            if len(temp) == 128 or end:
+                append_range(temp)
+                temp = []
+                repeat = False
+    return output
diff --git a/lib/python/qmk/painter_qff.py b/lib/python/qmk/painter_qff.py
new file mode 100644
index 0000000000..746bb166e5
--- /dev/null
+++ b/lib/python/qmk/painter_qff.py
@@ -0,0 +1,401 @@
+# Copyright 2021 Nick Brassel (@tzarc)
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Quantum Font File "QFF" Font File Format.
+# See https://docs.qmk.fm/#/quantum_painter_qff for more information.
+
+from pathlib import Path
+from typing import Dict, Any
+from colorsys import rgb_to_hsv
+from PIL import Image, ImageDraw, ImageFont, ImageChops
+from PIL._binary import o8, o16le as o16, o32le as o32
+from qmk.painter_qgf import QGFBlockHeader, QGFFramePaletteDescriptorV1
+from milc.attrdict import AttrDict
+import qmk.painter
+
+
+def o24(i):
+    return o16(i & 0xFFFF) + o8((i & 0xFF0000) >> 16)
+
+
+########################################################################################################################
+
+
+class QFFGlyphInfo(AttrDict):
+    def __init__(self, *args, **kwargs):
+        super().__init__()
+
+        for n, value in enumerate(args):
+            self[f'arg:{n}'] = value
+
+        for key, value in kwargs.items():
+            self[key] = value
+
+    def write(self, fp, include_code_point):
+        if include_code_point is True:
+            fp.write(o24(ord(self.code_point)))
+
+        value = ((self.data_offset << 6) & 0xFFFFC0) | (self.w & 0x3F)
+        fp.write(o24(value))
+
+
+########################################################################################################################
+
+
+class QFFFontDescriptor:
+    type_id = 0x00
+    length = 20
+    magic = 0x464651
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QFFFontDescriptor.type_id
+        self.header.length = QFFFontDescriptor.length
+        self.version = 1
+        self.total_file_size = 0
+        self.line_height = 0
+        self.has_ascii_table = False
+        self.unicode_glyph_count = 0
+        self.format = 0xFF
+        self.flags = 0
+        self.compression = 0xFF
+        self.transparency_index = 0xFF  # TODO: Work out how to retrieve the transparent palette entry from the PIL gif loader
+
+    def write(self, fp):
+        self.header.write(fp)
+        fp.write(
+            b''  # start off with empty bytes...
+            + o24(QFFFontDescriptor.magic)  # magic
+            + o8(self.version)  # version
+            + o32(self.total_file_size)  # file size
+            + o32((~self.total_file_size) & 0xFFFFFFFF)  # negated file size
+            + o8(self.line_height)  # line height
+            + o8(1 if self.has_ascii_table is True else 0)  # whether or not we have an ascii table present
+            + o16(self.unicode_glyph_count & 0xFFFF)  # number of unicode glyphs present
+            + o8(self.format)  # format
+            + o8(self.flags)  # flags
+            + o8(self.compression)  # compression
+            + o8(self.transparency_index)  # transparency index
+        )
+
+    @property
+    def is_transparent(self):
+        return (self.flags & 0x01) == 0x01
+
+    @is_transparent.setter
+    def is_transparent(self, val):
+        if val:
+            self.flags |= 0x01
+        else:
+            self.flags &= ~0x01
+
+
+########################################################################################################################
+
+
+class QFFAsciiGlyphTableV1:
+    type_id = 0x01
+    length = 95 * 3  # We have 95 glyphs: [0x20...0x7E]
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QFFAsciiGlyphTableV1.type_id
+        self.header.length = QFFAsciiGlyphTableV1.length
+
+        # Each glyph is key=code_point, value=QFFGlyphInfo
+        self.glyphs = {}
+
+    def add_glyph(self, glyph: QFFGlyphInfo):
+        self.glyphs[ord(glyph.code_point)] = glyph
+
+    def write(self, fp):
+        self.header.write(fp)
+
+        for n in range(0x20, 0x7F):
+            self.glyphs[n].write(fp, False)
+
+
+########################################################################################################################
+
+
+class QFFUnicodeGlyphTableV1:
+    type_id = 0x02
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QFFUnicodeGlyphTableV1.type_id
+        self.header.length = 0
+
+        # Each glyph is key=code_point, value=QFFGlyphInfo
+        self.glyphs = {}
+
+    def add_glyph(self, glyph: QFFGlyphInfo):
+        self.glyphs[ord(glyph.code_point)] = glyph
+
+    def write(self, fp):
+        self.header.length = len(self.glyphs.keys()) * 6
+        self.header.write(fp)
+
+        for n in sorted(self.glyphs.keys()):
+            self.glyphs[n].write(fp, True)
+
+
+########################################################################################################################
+
+
+class QFFFontDataDescriptorV1:
+    type_id = 0x04
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QFFFontDataDescriptorV1.type_id
+        self.data = []
+
+    def write(self, fp):
+        self.header.length = len(self.data)
+        self.header.write(fp)
+        fp.write(bytes(self.data))
+
+
+########################################################################################################################
+
+
+def _generate_font_glyphs_list(use_ascii, unicode_glyphs):
+    # The set of glyphs that we want to generate images for
+    glyphs = {}
+
+    # Add ascii charset if requested
+    if use_ascii is True:
+        for c in range(0x20, 0x7F):  # does not include 0x7F!
+            glyphs[chr(c)] = True
+
+    # Append any extra unicode glyphs
+    unicode_glyphs = list(unicode_glyphs)
+    for c in unicode_glyphs:
+        glyphs[c] = True
+
+    return sorted(glyphs.keys())
+
+
+class QFFFont:
+    def __init__(self, logger):
+        self.logger = logger
+        self.image = None
+        self.glyph_data = {}
+        self.glyph_height = 0
+        return
+
+    def _extract_glyphs(self, format):
+        total_data_size = 0
+        total_rle_data_size = 0
+
+        converted_img = qmk.painter.convert_requested_format(self.image, format)
+        (self.palette, _) = qmk.painter.convert_image_bytes(converted_img, format)
+
+        # Work out how many bytes used for RLE vs. non-RLE
+        for _, glyph_entry in self.glyph_data.items():
+            glyph_img = converted_img.crop((glyph_entry.x, 1, glyph_entry.x + glyph_entry.w, 1 + self.glyph_height))
+            (_, this_glyph_image_bytes) = qmk.painter.convert_image_bytes(glyph_img, format)
+            this_glyph_rle_bytes = qmk.painter.compress_bytes_qmk_rle(this_glyph_image_bytes)
+            total_data_size += len(this_glyph_image_bytes)
+            total_rle_data_size += len(this_glyph_rle_bytes)
+            glyph_entry['image_uncompressed_bytes'] = this_glyph_image_bytes
+            glyph_entry['image_compressed_bytes'] = this_glyph_rle_bytes
+
+        return (total_data_size, total_rle_data_size)
+
+    def _parse_image(self, img, include_ascii_glyphs: bool = True, unicode_glyphs: str = ''):
+        # Clear out any existing font metadata
+        self.image = None
+        # Each glyph is key=code_point, value={ x: ?, w: ? }
+        self.glyph_data = {}
+        self.glyph_height = 0
+
+        # Work out the list of glyphs required
+        glyphs = _generate_font_glyphs_list(include_ascii_glyphs, unicode_glyphs)
+
+        # Work out the geometry
+        (width, height) = img.size
+
+        # Work out the glyph offsets/widths
+        glyph_pixel_offsets = []
+        glyph_pixel_widths = []
+        pixels = img.load()
+
+        # Run through the markers and work out where each glyph starts/stops
+        glyph_split_color = pixels[0, 0]  # top left pixel is the marker color we're going to use to split each glyph
+        glyph_pixel_offsets.append(0)
+        last_offset = 0
+        for x in range(1, width):
+            if pixels[x, 0] == glyph_split_color:
+                glyph_pixel_offsets.append(x)
+                glyph_pixel_widths.append(x - last_offset)
+                last_offset = x
+        glyph_pixel_widths.append(width - last_offset)
+
+        # Make sure the number of glyphs we're attempting to generate matches the input image
+        if len(glyph_pixel_offsets) != len(glyphs):
+            self.logger.error('The number of glyphs to generate doesn\'t match the number of detected glyphs in the input image.')
+            return
+
+        # Set up the required metadata for each glyph
+        for n in range(0, len(glyph_pixel_offsets)):
+            self.glyph_data[glyphs[n]] = QFFGlyphInfo(code_point=glyphs[n], x=glyph_pixel_offsets[n], w=glyph_pixel_widths[n])
+
+        # Parsing was successful, keep the image in this instance
+        self.image = img
+        self.glyph_height = height - 1  # subtract the line with the markers
+
+    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):
+        # Load the font
+        font = ImageFont.truetype(str(ttf_file), int(font_size))
+        # Work out the max font size
+        max_font_size = font.font.ascent + abs(font.font.descent)
+        # Work out the list of glyphs required
+        glyphs = _generate_font_glyphs_list(include_ascii_glyphs, unicode_glyphs)
+
+        baseline_offset = 9999999
+        total_glyph_width = 0
+        max_glyph_height = -1
+
+        # Measure each glyph to determine the overall baseline offset required
+        for glyph in glyphs:
+            (ls_l, ls_t, ls_r, ls_b) = font.getbbox(glyph, anchor='ls')
+            glyph_width = (ls_r - ls_l) if include_before_left else (ls_r)
+            glyph_height = font.getbbox(glyph, anchor='la')[3]
+            if max_glyph_height < glyph_height:
+                max_glyph_height = glyph_height
+            total_glyph_width += glyph_width
+            if baseline_offset > ls_t:
+                baseline_offset = ls_t
+
+        # Create the output image
+        img = Image.new("RGB", (total_glyph_width + 1, max_font_size * 2 + 1), (0, 0, 0, 255))
+        cur_x_pos = 0
+
+        # Loop through each glyph...
+        for glyph in glyphs:
+            # Work out this glyph's bounding box
+            (ls_l, ls_t, ls_r, ls_b) = font.getbbox(glyph, anchor='ls')
+            glyph_width = (ls_r - ls_l) if include_before_left else (ls_r)
+            glyph_height = ls_b - ls_t
+            x_offset = -ls_l
+            y_offset = ls_t - baseline_offset
+
+            # Draw each glyph to its own image so we don't get anti-aliasing applied to the final image when straddling edges
+            glyph_img = Image.new("RGB", (glyph_width, max_font_size), (0, 0, 0, 255))
+            glyph_draw = ImageDraw.Draw(glyph_img)
+            if not use_aa:
+                glyph_draw.fontmode = "1"
+            glyph_draw.text((x_offset, y_offset), glyph, font=font, anchor='lt')
+
+            # Place the glyph-specific image in the correct location overall
+            img.paste(glyph_img, (cur_x_pos, 1))
+
+            # Set up the marker for start of each glyph
+            pixels = img.load()
+            pixels[cur_x_pos, 0] = (255, 0, 255)
+
+            # Increment for the next glyph's position
+            cur_x_pos += glyph_width
+
+        # Add the ending marker so that the difference/crop works
+        pixels = img.load()
+        pixels[cur_x_pos, 0] = (255, 0, 255)
+
+        # Determine the usable font area
+        dummy_img = Image.new("RGB", (total_glyph_width + 1, max_font_size + 1), (0, 0, 0, 255))
+        bbox = ImageChops.difference(img, dummy_img).getbbox()
+        bbox = (bbox[0], bbox[1], bbox[2] - 1, bbox[3])  # remove the unused end-marker
+
+        # Crop and re-parse the resulting image to ensure we're generating the correct format
+        self._parse_image(img.crop(bbox), include_ascii_glyphs, unicode_glyphs)
+
+    def save_to_image(self, img_file: Path):
+        # Drop out if there's no image loaded
+        if self.image is None:
+            self.logger.error('No image is loaded.')
+            return
+
+        # Save the image to the supplied file
+        self.image.save(str(img_file))
+
+    def read_from_image(self, img_file: Path, include_ascii_glyphs: bool = True, unicode_glyphs: str = ''):
+        # Load and parse the supplied image file
+        self._parse_image(Image.open(str(img_file)), include_ascii_glyphs, unicode_glyphs)
+        return
+
+    def save_to_qff(self, format: Dict[str, Any], use_rle: bool, fp):
+        # Drop out if there's no image loaded
+        if self.image is None:
+            self.logger.error('No image is loaded.')
+            return
+
+        # Work out if we want to use RLE at all, skipping it if it's not any smaller (it's applied per-glyph)
+        (total_data_size, total_rle_data_size) = self._extract_glyphs(format)
+        if use_rle:
+            use_rle = (total_rle_data_size < total_data_size)
+
+        # For each glyph, work out which image data we want to use and append it to the image buffer, recording the byte-wise offset
+        img_buffer = bytes()
+        for _, glyph_entry in self.glyph_data.items():
+            glyph_entry['data_offset'] = len(img_buffer)
+            glyph_img_bytes = glyph_entry.image_compressed_bytes if use_rle else glyph_entry.image_uncompressed_bytes
+            img_buffer += bytes(glyph_img_bytes)
+
+        font_descriptor = QFFFontDescriptor()
+        ascii_table = QFFAsciiGlyphTableV1()
+        unicode_table = QFFUnicodeGlyphTableV1()
+        data_descriptor = QFFFontDataDescriptorV1()
+        data_descriptor.data = img_buffer
+
+        # Check if we have all the ASCII glyphs present
+        include_ascii_glyphs = all([chr(n) in self.glyph_data for n in range(0x20, 0x7F)])
+
+        # Helper for populating the blocks
+        for code_point, glyph_entry in self.glyph_data.items():
+            if ord(code_point) >= 0x20 and ord(code_point) <= 0x7E and include_ascii_glyphs:
+                ascii_table.add_glyph(glyph_entry)
+            else:
+                unicode_table.add_glyph(glyph_entry)
+
+        # Configure the font descriptor
+        font_descriptor.line_height = self.glyph_height
+        font_descriptor.has_ascii_table = include_ascii_glyphs
+        font_descriptor.unicode_glyph_count = len(unicode_table.glyphs.keys())
+        font_descriptor.is_transparent = False
+        font_descriptor.format = format['image_format_byte']
+        font_descriptor.compression = 0x01 if use_rle else 0x00
+
+        # Write a dummy font descriptor -- we'll have to come back and write it properly once we've rendered out everything else
+        font_descriptor_location = fp.tell()
+        font_descriptor.write(fp)
+
+        # Write out the ASCII table if required
+        if font_descriptor.has_ascii_table:
+            ascii_table.write(fp)
+
+        # Write out the unicode table if required
+        if font_descriptor.unicode_glyph_count > 0:
+            unicode_table.write(fp)
+
+        # Write out the palette if required
+        if format['has_palette']:
+            palette_descriptor = QGFFramePaletteDescriptorV1()
+
+            # Helper to convert from RGB888 to the QMK "dialect" of HSV888
+            def rgb888_to_qmk_hsv888(e):
+                hsv = rgb_to_hsv(e[0] / 255.0, e[1] / 255.0, e[2] / 255.0)
+                return (int(hsv[0] * 255.0), int(hsv[1] * 255.0), int(hsv[2] * 255.0))
+
+            # Convert all palette entries to HSV888 and write to the output
+            palette_descriptor.palette_entries = list(map(rgb888_to_qmk_hsv888, self.palette))
+            palette_descriptor.write(fp)
+
+        # Write out the image data
+        data_descriptor.write(fp)
+
+        # Now fix up the overall font descriptor, then write it in the correct location
+        font_descriptor.total_file_size = fp.tell()
+        fp.seek(font_descriptor_location, 0)
+        font_descriptor.write(fp)
diff --git a/lib/python/qmk/painter_qgf.py b/lib/python/qmk/painter_qgf.py
new file mode 100644
index 0000000000..71ce1f5a02
--- /dev/null
+++ b/lib/python/qmk/painter_qgf.py
@@ -0,0 +1,408 @@
+# Copyright 2021 Nick Brassel (@tzarc)
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Quantum Graphics File "QGF" Image File Format.
+# See https://docs.qmk.fm/#/quantum_painter_qgf for more information.
+
+from colorsys import rgb_to_hsv
+from types import FunctionType
+from PIL import Image, ImageFile, ImageChops
+from PIL._binary import o8, o16le as o16, o32le as o32
+import qmk.painter
+
+
+def o24(i):
+    return o16(i & 0xFFFF) + o8((i & 0xFF0000) >> 16)
+
+
+########################################################################################################################
+
+
+class QGFBlockHeader:
+    block_size = 5
+
+    def write(self, fp):
+        fp.write(b''  # start off with empty bytes...
+                 + o8(self.type_id)  # block type id
+                 + o8((~self.type_id) & 0xFF)  # negated block type id
+                 + o24(self.length)  # blob length
+                 )
+
+
+########################################################################################################################
+
+
+class QGFGraphicsDescriptor:
+    type_id = 0x00
+    length = 18
+    magic = 0x464751
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QGFGraphicsDescriptor.type_id
+        self.header.length = QGFGraphicsDescriptor.length
+        self.version = 1
+        self.total_file_size = 0
+        self.image_width = 0
+        self.image_height = 0
+        self.frame_count = 0
+
+    def write(self, fp):
+        self.header.write(fp)
+        fp.write(
+            b''  # start off with empty bytes...
+            + o24(QGFGraphicsDescriptor.magic)  # magic
+            + o8(self.version)  # version
+            + o32(self.total_file_size)  # file size
+            + o32((~self.total_file_size) & 0xFFFFFFFF)  # negated file size
+            + o16(self.image_width)  # width
+            + o16(self.image_height)  # height
+            + o16(self.frame_count)  # frame count
+        )
+
+
+########################################################################################################################
+
+
+class QGFFrameOffsetDescriptorV1:
+    type_id = 0x01
+
+    def __init__(self, frame_count):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QGFFrameOffsetDescriptorV1.type_id
+        self.frame_offsets = [0xFFFFFFFF] * frame_count
+        self.frame_count = frame_count
+
+    def write(self, fp):
+        self.header.length = len(self.frame_offsets) * 4
+        self.header.write(fp)
+        for offset in self.frame_offsets:
+            fp.write(b''  # start off with empty bytes...
+                     + o32(offset)  # offset
+                     )
+
+
+########################################################################################################################
+
+
+class QGFFrameDescriptorV1:
+    type_id = 0x02
+    length = 6
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QGFFrameDescriptorV1.type_id
+        self.header.length = QGFFrameDescriptorV1.length
+        self.format = 0xFF
+        self.flags = 0
+        self.compression = 0xFF
+        self.transparency_index = 0xFF  # TODO: Work out how to retrieve the transparent palette entry from the PIL gif loader
+        self.delay = 1000  # Placeholder until it gets read from the animation
+
+    def write(self, fp):
+        self.header.write(fp)
+        fp.write(b''  # start off with empty bytes...
+                 + o8(self.format)  # format
+                 + o8(self.flags)  # flags
+                 + o8(self.compression)  # compression
+                 + o8(self.transparency_index)  # transparency index
+                 + o16(self.delay)  # delay
+                 )
+
+    @property
+    def is_transparent(self):
+        return (self.flags & 0x01) == 0x01
+
+    @is_transparent.setter
+    def is_transparent(self, val):
+        if val:
+            self.flags |= 0x01
+        else:
+            self.flags &= ~0x01
+
+    @property
+    def is_delta(self):
+        return (self.flags & 0x02) == 0x02
+
+    @is_delta.setter
+    def is_delta(self, val):
+        if val:
+            self.flags |= 0x02
+        else:
+            self.flags &= ~0x02
+
+
+########################################################################################################################
+
+
+class QGFFramePaletteDescriptorV1:
+    type_id = 0x03
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QGFFramePaletteDescriptorV1.type_id
+        self.header.length = 0
+        self.palette_entries = [(0xFF, 0xFF, 0xFF)] * 4
+
+    def write(self, fp):
+        self.header.length = len(self.palette_entries) * 3
+        self.header.write(fp)
+        for entry in self.palette_entries:
+            fp.write(b''  # start off with empty bytes...
+                     + o8(entry[0])  # h
+                     + o8(entry[1])  # s
+                     + o8(entry[2])  # v
+                     )
+
+
+########################################################################################################################
+
+
+class QGFFrameDeltaDescriptorV1:
+    type_id = 0x04
+    length = 8
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QGFFrameDeltaDescriptorV1.type_id
+        self.header.length = QGFFrameDeltaDescriptorV1.length
+        self.left = 0
+        self.top = 0
+        self.right = 0
+        self.bottom = 0
+
+    def write(self, fp):
+        self.header.write(fp)
+        fp.write(b''  # start off with empty bytes...
+                 + o16(self.left)  # left
+                 + o16(self.top)  # top
+                 + o16(self.right)  # right
+                 + o16(self.bottom)  # bottom
+                 )
+
+
+########################################################################################################################
+
+
+class QGFFrameDataDescriptorV1:
+    type_id = 0x05
+
+    def __init__(self):
+        self.header = QGFBlockHeader()
+        self.header.type_id = QGFFrameDataDescriptorV1.type_id
+        self.data = []
+
+    def write(self, fp):
+        self.header.length = len(self.data)
+        self.header.write(fp)
+        fp.write(bytes(self.data))
+
+
+########################################################################################################################
+
+
+class QGFImageFile(ImageFile.ImageFile):
+
+    format = "QGF"
+    format_description = "Quantum Graphics File Format"
+
+    def _open(self):
+        raise NotImplementedError("Reading QGF files is not supported")
+
+
+########################################################################################################################
+
+
+def _accept(prefix):
+    """Helper method used by PIL to work out if it can parse an input file.
+
+    Currently unimplemented.
+    """
+    return False
+
+
+def _save(im, fp, filename):
+    """Helper method used by PIL to write to an output file.
+    """
+    # Work out from the parameters if we need to do anything special
+    encoderinfo = im.encoderinfo.copy()
+    append_images = list(encoderinfo.get("append_images", []))
+    verbose = encoderinfo.get("verbose", False)
+    use_deltas = encoderinfo.get("use_deltas", True)
+    use_rle = encoderinfo.get("use_rle", True)
+
+    # Helper for inline verbose prints
+    def vprint(s):
+        if verbose:
+            print(s)
+
+    # Helper to iterate through all frames in the input image
+    def _for_all_frames(x: FunctionType):
+        frame_num = 0
+        last_frame = None
+        for frame in [im] + append_images:
+            # Get number of of frames in this image
+            nfr = getattr(frame, "n_frames", 1)
+            for idx in range(nfr):
+                frame.seek(idx)
+                frame.load()
+                copy = frame.copy().convert("RGB")
+                x(frame_num, copy, last_frame)
+                last_frame = copy
+                frame_num += 1
+
+    # Collect all the frame sizes
+    frame_sizes = []
+    _for_all_frames(lambda idx, frame, last_frame: frame_sizes.append(frame.size))
+
+    # Make sure all frames are the same size
+    if len(list(set(frame_sizes))) != 1:
+        raise ValueError("Mismatching sizes on frames")
+
+    # Write out the initial graphics descriptor (and write a dummy value), so that we can come back and fill in the
+    # correct values once we've written all the frames to the output
+    graphics_descriptor_location = fp.tell()
+    graphics_descriptor = QGFGraphicsDescriptor()
+    graphics_descriptor.frame_count = len(frame_sizes)
+    graphics_descriptor.image_width = frame_sizes[0][0]
+    graphics_descriptor.image_height = frame_sizes[0][1]
+    vprint(f'{"Graphics descriptor block":26s} {fp.tell():5d}d / {fp.tell():04X}h')
+    graphics_descriptor.write(fp)
+
+    # Work out the frame offset descriptor location (and write a dummy value), so that we can come back and fill in the
+    # correct offsets once we've written all the frames to the output
+    frame_offset_location = fp.tell()
+    frame_offsets = QGFFrameOffsetDescriptorV1(graphics_descriptor.frame_count)
+    vprint(f'{"Frame offsets block":26s} {fp.tell():5d}d / {fp.tell():04X}h')
+    frame_offsets.write(fp)
+
+    # Helper function to save each frame to the output file
+    def _write_frame(idx, frame, last_frame):
+        # If we replace the frame we're going to output with a delta, we can override it here
+        this_frame = frame
+        location = (0, 0)
+        size = frame.size
+
+        # Work out the format we're going to use
+        format = encoderinfo["qmk_format"]
+
+        # Convert the original frame so we can do comparisons
+        converted = qmk.painter.convert_requested_format(this_frame, format)
+        graphic_data = qmk.painter.convert_image_bytes(converted, format)
+
+        # Convert the raw data to RLE-encoded if requested
+        raw_data = graphic_data[1]
+        if use_rle:
+            rle_data = qmk.painter.compress_bytes_qmk_rle(graphic_data[1])
+        use_raw_this_frame = not use_rle or len(raw_data) <= len(rle_data)
+        image_data = raw_data if use_raw_this_frame else rle_data
+
+        # Work out if a delta frame is smaller than injecting it directly
+        use_delta_this_frame = False
+        if use_deltas and last_frame is not None:
+            # If we want to use deltas, then find the difference
+            diff = ImageChops.difference(frame, last_frame)
+
+            # Get the bounding box of those differences
+            bbox = diff.getbbox()
+
+            # If we have a valid bounding box...
+            if bbox:
+                # ...create the delta frame by cropping the original.
+                delta_frame = frame.crop(bbox)
+                delta_location = (bbox[0], bbox[1])
+                delta_size = (bbox[2] - bbox[0], bbox[3] - bbox[1])
+
+                # Convert the delta frame to the requested format
+                delta_converted = qmk.painter.convert_requested_format(delta_frame, format)
+                delta_graphic_data = qmk.painter.convert_image_bytes(delta_converted, format)
+
+                # Work out how large the delta frame is going to be with compression etc.
+                delta_raw_data = delta_graphic_data[1]
+                if use_rle:
+                    delta_rle_data = qmk.painter.compress_bytes_qmk_rle(delta_graphic_data[1])
+                delta_use_raw_this_frame = not use_rle or len(delta_raw_data) <= len(delta_rle_data)
+                delta_image_data = delta_raw_data if delta_use_raw_this_frame else delta_rle_data
+
+                # If the size of the delta frame (plus delta descriptor) is smaller than the original, use that instead
+                # This ensures that if a non-delta is overall smaller in size, we use that in preference due to flash
+                # sizing constraints.
+                if (len(delta_image_data) + QGFFrameDeltaDescriptorV1.length) < len(image_data):
+                    # Copy across all the delta equivalents so that the rest of the processing acts on those
+                    this_frame = delta_frame
+                    location = delta_location
+                    size = delta_size
+                    converted = delta_converted
+                    graphic_data = delta_graphic_data
+                    raw_data = delta_raw_data
+                    rle_data = delta_rle_data
+                    use_raw_this_frame = delta_use_raw_this_frame
+                    image_data = delta_image_data
+                    use_delta_this_frame = True
+
+        # Write out the frame descriptor
+        frame_offsets.frame_offsets[idx] = fp.tell()
+        vprint(f'{f"Frame {idx:3d} base":26s} {fp.tell():5d}d / {fp.tell():04X}h')
+        frame_descriptor = QGFFrameDescriptorV1()
+        frame_descriptor.is_delta = use_delta_this_frame
+        frame_descriptor.is_transparent = False
+        frame_descriptor.format = format['image_format_byte']
+        frame_descriptor.compression = 0x00 if use_raw_this_frame else 0x01  # See qp.h, painter_compression_t
+        frame_descriptor.delay = frame.info['duration'] if 'duration' in frame.info else 1000  # If we're not an animation, just pretend we're delaying for 1000ms
+        frame_descriptor.write(fp)
+
+        # Write out the palette if required
+        if format['has_palette']:
+            palette = graphic_data[0]
+            palette_descriptor = QGFFramePaletteDescriptorV1()
+
+            # Helper to convert from RGB888 to the QMK "dialect" of HSV888
+            def rgb888_to_qmk_hsv888(e):
+                hsv = rgb_to_hsv(e[0] / 255.0, e[1] / 255.0, e[2] / 255.0)
+                return (int(hsv[0] * 255.0), int(hsv[1] * 255.0), int(hsv[2] * 255.0))
+
+            # Convert all palette entries to HSV888 and write to the output
+            palette_descriptor.palette_entries = list(map(rgb888_to_qmk_hsv888, palette))
+            vprint(f'{f"Frame {idx:3d} palette":26s} {fp.tell():5d}d / {fp.tell():04X}h')
+            palette_descriptor.write(fp)
+
+        # Write out the delta info if required
+        if use_delta_this_frame:
+            # Set up the rendering location of where the delta frame should be situated
+            delta_descriptor = QGFFrameDeltaDescriptorV1()
+            delta_descriptor.left = location[0]
+            delta_descriptor.top = location[1]
+            delta_descriptor.right = location[0] + size[0]
+            delta_descriptor.bottom = location[1] + size[1]
+
+            # Write the delta frame to the output
+            vprint(f'{f"Frame {idx:3d} delta":26s} {fp.tell():5d}d / {fp.tell():04X}h')
+            delta_descriptor.write(fp)
+
+        # Write out the data for this frame to the output
+        data_descriptor = QGFFrameDataDescriptorV1()
+        data_descriptor.data = image_data
+        vprint(f'{f"Frame {idx:3d} data":26s} {fp.tell():5d}d / {fp.tell():04X}h')
+        data_descriptor.write(fp)
+
+    # Iterate over each if the input frames, writing it to the output in the process
+    _for_all_frames(_write_frame)
+
+    # Go back and update the graphics descriptor now that we can determine the final file size
+    graphics_descriptor.total_file_size = fp.tell()
+    fp.seek(graphics_descriptor_location, 0)
+    graphics_descriptor.write(fp)
+
+    # Go back and update the frame offsets now that they're written to the file
+    fp.seek(frame_offset_location, 0)
+    frame_offsets.write(fp)
+
+
+########################################################################################################################
+
+# Register with PIL so that it knows about the QGF format
+Image.register_open(QGFImageFile.format, QGFImageFile, _accept)
+Image.register_save(QGFImageFile.format, _save)
+Image.register_save_all(QGFImageFile.format, _save)
+Image.register_extension(QGFImageFile.format, f".{QGFImageFile.format.lower()}")
+Image.register_mime(QGFImageFile.format, f"image/{QGFImageFile.format.lower()}")