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268 lines
8.1 KiB
268 lines
8.1 KiB
"""Functions that help us work with Quantum Painter's file formats.
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"""
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import math
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import re
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from string import Template
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from PIL import Image, ImageOps
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# The list of valid formats Quantum Painter supports
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valid_formats = {
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'pal256': {
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'image_format': 'IMAGE_FORMAT_PALETTE',
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'bpp': 8,
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'has_palette': True,
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'num_colors': 256,
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'image_format_byte': 0x07, # see qp_internal_formats.h
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},
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'pal16': {
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'image_format': 'IMAGE_FORMAT_PALETTE',
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'bpp': 4,
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'has_palette': True,
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'num_colors': 16,
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'image_format_byte': 0x06, # see qp_internal_formats.h
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},
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'pal4': {
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'image_format': 'IMAGE_FORMAT_PALETTE',
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'bpp': 2,
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'has_palette': True,
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'num_colors': 4,
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'image_format_byte': 0x05, # see qp_internal_formats.h
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},
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'pal2': {
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'image_format': 'IMAGE_FORMAT_PALETTE',
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'bpp': 1,
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'has_palette': True,
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'num_colors': 2,
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'image_format_byte': 0x04, # see qp_internal_formats.h
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},
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'mono256': {
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'image_format': 'IMAGE_FORMAT_GRAYSCALE',
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'bpp': 8,
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'has_palette': False,
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'num_colors': 256,
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'image_format_byte': 0x03, # see qp_internal_formats.h
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},
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'mono16': {
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'image_format': 'IMAGE_FORMAT_GRAYSCALE',
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'bpp': 4,
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'has_palette': False,
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'num_colors': 16,
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'image_format_byte': 0x02, # see qp_internal_formats.h
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},
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'mono4': {
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'image_format': 'IMAGE_FORMAT_GRAYSCALE',
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'bpp': 2,
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'has_palette': False,
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'num_colors': 4,
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'image_format_byte': 0x01, # see qp_internal_formats.h
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},
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'mono2': {
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'image_format': 'IMAGE_FORMAT_GRAYSCALE',
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'bpp': 1,
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'has_palette': False,
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'num_colors': 2,
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'image_format_byte': 0x00, # see qp_internal_formats.h
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}
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}
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license_template = """\
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// Copyright ${year} QMK -- generated source code only, ${generated_type} retains original copyright
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// SPDX-License-Identifier: GPL-2.0-or-later
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// This file was auto-generated by `${generator_command}`
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"""
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def render_license(subs):
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license_txt = Template(license_template)
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return license_txt.substitute(subs)
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header_file_template = """\
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${license}
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#pragma once
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#include <qp.h>
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extern const uint32_t ${var_prefix}_${sane_name}_length;
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extern const uint8_t ${var_prefix}_${sane_name}[${byte_count}];
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"""
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def render_header(subs):
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header_txt = Template(header_file_template)
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return header_txt.substitute(subs)
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source_file_template = """\
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${license}
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#include <qp.h>
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const uint32_t ${var_prefix}_${sane_name}_length = ${byte_count};
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// clang-format off
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const uint8_t ${var_prefix}_${sane_name}[${byte_count}] = {
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${bytes_lines}
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};
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// clang-format on
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"""
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def render_source(subs):
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source_txt = Template(source_file_template)
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return source_txt.substitute(subs)
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def render_bytes(bytes, newline_after=16):
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lines = ''
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for n in range(len(bytes)):
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if n % newline_after == 0 and n > 0 and n != len(bytes):
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lines = lines + "\n "
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elif n == 0:
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lines = lines + " "
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lines = lines + " 0x{0:02X},".format(bytes[n])
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return lines.rstrip()
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def clean_output(str):
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str = re.sub(r'\r', '', str)
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str = re.sub(r'[\n]{3,}', r'\n\n', str)
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return str
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def rescale_byte(val, maxval):
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"""Rescales a byte value to the supplied range, i.e. [0,255] -> [0,maxval].
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"""
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return int(round(val * maxval / 255.0))
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def convert_requested_format(im, format):
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"""Convert an image to the requested format.
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"""
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# Work out the requested format
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ncolors = format["num_colors"]
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image_format = format["image_format"]
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# Ensure we have a valid number of colors for the palette
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if ncolors <= 0 or ncolors > 256 or (ncolors & (ncolors - 1) != 0):
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raise ValueError("Number of colors must be 2, 4, 16, or 256.")
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# Work out where we're getting the bytes from
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if image_format == 'IMAGE_FORMAT_GRAYSCALE':
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# If mono, convert input to grayscale, then to RGB, then grab the raw bytes corresponding to the intensity of the red channel
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im = ImageOps.grayscale(im)
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im = im.convert("RGB")
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elif image_format == 'IMAGE_FORMAT_PALETTE':
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# If color, convert input to RGB, palettize based on the supplied number of colors, then get the raw palette bytes
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im = im.convert("RGB")
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im = im.convert("P", palette=Image.ADAPTIVE, colors=ncolors)
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return im
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def convert_image_bytes(im, format):
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"""Convert the supplied image to the equivalent bytes required by the QMK firmware.
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"""
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# Work out the requested format
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ncolors = format["num_colors"]
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image_format = format["image_format"]
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shifter = int(math.log2(ncolors))
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pixels_per_byte = int(8 / math.log2(ncolors))
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(width, height) = im.size
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expected_byte_count = ((width * height) + (pixels_per_byte - 1)) // pixels_per_byte
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if image_format == 'IMAGE_FORMAT_GRAYSCALE':
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# Take the red channel
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image_bytes = im.tobytes("raw", "R")
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image_bytes_len = len(image_bytes)
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# No palette
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palette = None
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bytearray = []
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for x in range(expected_byte_count):
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byte = 0
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for n in range(pixels_per_byte):
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byte_offset = x * pixels_per_byte + n
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if byte_offset < image_bytes_len:
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# If mono, each input byte is a grayscale [0,255] pixel -- rescale to the range we want then pack together
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byte = byte | (rescale_byte(image_bytes[byte_offset], ncolors - 1) << int(n * shifter))
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bytearray.append(byte)
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elif image_format == 'IMAGE_FORMAT_PALETTE':
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# Convert each pixel to the palette bytes
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image_bytes = im.tobytes("raw", "P")
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image_bytes_len = len(image_bytes)
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# Export the palette
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palette = []
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pal = im.getpalette()
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for n in range(0, ncolors * 3, 3):
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palette.append((pal[n + 0], pal[n + 1], pal[n + 2]))
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bytearray = []
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for x in range(expected_byte_count):
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byte = 0
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for n in range(pixels_per_byte):
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byte_offset = x * pixels_per_byte + n
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if byte_offset < image_bytes_len:
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# If color, each input byte is the index into the color palette -- pack them together
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byte = byte | ((image_bytes[byte_offset] & (ncolors - 1)) << int(n * shifter))
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bytearray.append(byte)
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if len(bytearray) != expected_byte_count:
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raise Exception(f"Wrong byte count, was {len(bytearray)}, expected {expected_byte_count}")
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return (palette, bytearray)
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def compress_bytes_qmk_rle(bytearray):
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debug_dump = False
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output = []
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temp = []
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repeat = False
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def append_byte(c):
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if debug_dump:
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print('Appending byte:', '0x{0:02X}'.format(int(c)), '=', c)
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output.append(c)
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def append_range(r):
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append_byte(127 + len(r))
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if debug_dump:
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print('Appending {0} byte(s):'.format(len(r)), '[', ', '.join(['{0:02X}'.format(e) for e in r]), ']')
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output.extend(r)
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for n in range(0, len(bytearray) + 1):
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end = True if n == len(bytearray) else False
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if not end:
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c = bytearray[n]
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temp.append(c)
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if len(temp) <= 1:
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continue
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if debug_dump:
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print('Temp buffer state {0:3d} bytes:'.format(len(temp)), '[', ', '.join(['{0:02X}'.format(e) for e in temp]), ']')
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if repeat:
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if temp[-1] != temp[-2]:
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repeat = False
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if not repeat or len(temp) == 128 or end:
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append_byte(len(temp) if end else len(temp) - 1)
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append_byte(temp[0])
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temp = [temp[-1]]
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repeat = False
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else:
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if len(temp) >= 2 and temp[-1] == temp[-2]:
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repeat = True
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if len(temp) > 2:
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append_range(temp[0:(len(temp) - 2)])
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temp = [temp[-1], temp[-1]]
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continue
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if len(temp) == 128 or end:
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append_range(temp)
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temp = []
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repeat = False
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return output
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