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- import png, struct, os, math, pdb
- import sys
- xy = False #Set to false for yx swizzle order
- def chunks(l, n):
- """Yield successive n-sized chunks from l."""
- for i in range(0, len(l), n):
- yield l[i:i + n]
- def unswizzle(writebuf, readbuf, writeoffset, segwidth, segheight, datawidth):
- global readoffset, buffer
- ## print(segwidth, segheight)
- if segwidth == 2 and segheight == 2:
- if xy:
- writebuf[writeoffset:writeoffset+2] = readbuf[readoffset:readoffset+2]
- writebuf[writeoffset + datawidth:writeoffset + datawidth + 2] = readbuf[readoffset + 2:readoffset + 4]
- else:
- writebuf[writeoffset] = readbuf[readoffset]
- writebuf[writeoffset + datawidth] = readbuf[readoffset + 1]
- writebuf[writeoffset + 1] = readbuf[readoffset + 2]
- writebuf[writeoffset + datawidth + 1] = readbuf[readoffset + 3]
- readoffset += 4
- else:
- if xy:
- unswizzle(writebuf, readbuf, writeoffset, segwidth // 2, segheight // 2, datawidth)
- unswizzle(writebuf, readbuf, writeoffset + segwidth // 2, segwidth // 2, segheight // 2, datawidth)
- unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2), segwidth // 2, segheight // 2, datawidth)
- unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2) + segwidth // 2, segwidth // 2, segheight // 2, datawidth)
- else:
- unswizzle(writebuf, readbuf, writeoffset, segwidth // 2, segheight // 2, datawidth)
- unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2), segwidth // 2, segheight // 2, datawidth)
- unswizzle(writebuf, readbuf, writeoffset + segwidth // 2, segwidth // 2, segheight // 2, datawidth)
- unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2) + segwidth // 2, segwidth // 2, segheight // 2, datawidth)
- with open('1ch6030.ykcmp.dec', 'rb') as f:
- palette = f.read(0x400)
- bitmap = f.read(0x40000)
- width = 512
- height = 512
- buffer = bytearray(len(bitmap)) #Output buffer
- readoffset = 0 #Input position counter
- if width == height:
- unswizzle(buffer, bitmap, 0, width, height, width)
- elif width > height:
- for w in range(0, width, height):
- unswizzle(buffer, bitmap, w, height, height, width)
- elif height > width:
- for h in range(0, height * width, width ** 2):
- unswizzle(buffer, bitmap, h, width, width, width)
- else:
- print('error')
- p = list(chunks(buffer, width))
- with open('output.png', 'wb') as f:
- w = png.Writer(len(p[0]), len(p), palette=list(chunks(palette, 4)))
- w.write(f, p)
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