mirror of
https://github.com/laanwj/k210-sdk-stuff.git
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4f2c51e00d
By swapping the endian in RAMCTRL as well as in the SPI driver, the frame format can be coerced into the "normal" order of pixels in little endian, `0xBBBBAAAA` instead of `0xAAAABBBB`. This allows seamless casting from an array of `u16`. Accessing as 32-bit units might still be desirable for performance, but it is a lesser worry now. Note that a 32-bit alignment constraint still does hold for DMA.
110 lines
3.1 KiB
Python
Executable File
110 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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'''
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Slice an image (or multiple images) into 8x8 chunks (tiles) and deduplicate
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them to create a color font and a sequence of characters that represents the
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original image(s).
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'''
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import sys
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from PIL import Image
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import struct
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BW=8 # tile width
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BH=8 # tile height
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BG=(0,0,0) # RGB color for background (hardcoded, could be configurable)
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def rgb565(color):
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'''Truncate RGB888[8] color to RGB565'''
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return ((color[0] >> 3) << 11) | ((color[1] >> 2) << 5) | (color[2] >> 3)
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def extract_block(img, coord):
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'''Extract a RGB block from an image.'''
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data = []
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for yi in range(0, BH):
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row = []
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for xi in range(0, BW):
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try:
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row.append(img.getpixel((coord[0] + xi, coord[1] + yi)))
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except IndexError:
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row.append(BG)
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data.append(row)
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return data
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def encode_block(block):
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'''Encode RGB block to 32-bit column-swizzled RGB565'''
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out = []
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for yi in range(0, BH):
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for xi in range(0, BW//2):
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out.append(
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(rgb565(block[yi][xi*2 + 0]) << 0) |
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rgb565(block[yi][xi*2 + 1]) << 16)
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return tuple(out)
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assert(len(sys.argv) >= 3)
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infiles = sys.argv[1:-1]
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outfile = sys.argv[-1]
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images = [(infile, Image.open(infile)) for infile in infiles]
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# character set, addressed by content
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charset = {}
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# add empty block as character 0
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empty_block = encode_block([[BG]*BW]*BH)
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charset[empty_block] = 0
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# sequence of characters to represent every image
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seq = []
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for (infile, img) in images:
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blocks_x = (img.size[0] + (BW-1))//BW
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blocks_y = (img.size[1] + (BH-1))//BH
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print(f'{infile}: {blocks_x}×{blocks_y}')
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out = []
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for by in range(0, blocks_y):
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row = []
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for bx in range(0, blocks_x):
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bd = encode_block(extract_block(img, (bx * BW, by * BH)))
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try:
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# re-use existing matching character
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ch = charset[bd]
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except KeyError:
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# add character to character set
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ch = len(charset)
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charset[bd] = ch
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row.append(ch)
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out.append(row)
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seq.append((out, blocks_x, blocks_y))
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m = len(empty_block)
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n = len(charset)
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print(f'used {n} characters')
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charset_by_ch = [None] * n
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for (bd, ch) in charset.items():
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charset_by_ch[ch] = bd
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with open(outfile, 'w') as f:
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f.write(f'/* Auto-generated from {infile} by gencolorfont.py */\n')
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f.write('#[rustfmt::skip]\n')
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f.write(f'pub static FONT: [[u32; {m}]; {n}] = [\n')
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for bd in charset_by_ch:
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f.write(' [')
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for val in bd:
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f.write(f'0x{val:08x}, ')
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f.write('],\n')
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f.write('];\n')
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f.write('\n')
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# TODO: output sequence; RLE encoding of some kind?
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for (i,(out,blocks_x,blocks_y)) in enumerate(seq):
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f.write('#[rustfmt::skip]\n')
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f.write(f'pub static SEQ{i}: [[u16; {blocks_x}]; {blocks_y}] = [\n')
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for subseq in out:
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f.write(' [')
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for val in subseq:
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f.write(f'0x{val:04x}, ')
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f.write('],\n')
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f.write('];\n')
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