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102 lines
2.5 KiB
Python
102 lines
2.5 KiB
Python
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import struct, zlib, sys
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class image:
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w = 0
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h = 0
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data = []
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def read_tga(f):
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image = f.read()
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img_type = struct.unpack("<B", image[2:3])[0]
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img_bpp = struct.unpack("<B", image[16:17])[0]
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img_width = struct.unpack("<H", image[12:14])[0]
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img_height = struct.unpack("<H", image[14:16])[0]
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if img_type != 2 or img_bpp != 32:
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print "image must be a RGBA"
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start = 18+struct.unpack("B", image[0])[0]
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end = start + img_width*img_height*4
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image_data = image[start:end] # fetch raw data
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return image_data
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def write_tga(f, w, h, bpp, data):
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f.write(struct.pack("<BBBHHBHHHHBB", 0, 0, 2, 0, 0, 0, 0, 0, w, h, bpp, 0) + data)
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def load_png(f):
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def read(fmt): return struct.unpack("!"+fmt, f.read(struct.calcsize("!"+fmt)))
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def skip(count): f.read(count)
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# read signature
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if read("cccccccc") != ('\x89', 'P', 'N', 'G', '\r', '\n', '\x1a', '\n'):
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return 0
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# read chunks
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width = -1
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height = -1
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imagedata = ""
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while 1:
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size, id = read("I4s")
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if id == "IHDR": # read header
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width, height, bpp, colortype, compression, filter, interlace = read("IIBBBBB")
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if bpp != 8 or compression != 0 or filter != 0 or interlace != 0 or (colortype != 2 and colortype != 6):
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print "can't handle png of this type"
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print width, height, bpp, colortype, compression, filter, interlace
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return 0
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skip(4)
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elif id == "IDAT":
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imagedata += f.read(size)
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skip(4) # read data
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elif id == "IEND":
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break # we are done! \o/
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else:
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skip(size+4) # skip unknown chunks
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# decompress image data
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rawdata = map(ord, zlib.decompress(imagedata))
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# apply per scanline filters
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pitch = width*4+1
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bpp = 4
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imgdata = []
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prevline = [0 for x in xrange(0, (width+1)*bpp)]
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for y in xrange(0,height):
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filter = rawdata[pitch*y]
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pixeldata = rawdata[pitch*y+1:pitch*y+pitch]
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thisline = [0 for x in xrange(0,bpp)]
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def paeth(a, b, c):
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p = a + b - c
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pa = abs(p - a)
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pb = abs(p - b)
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pc = abs(p - c)
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if pa <= pb and pa <= pc:
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return a
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if pb <= pc:
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return b
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return c
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if filter == 0: f = lambda a,b,c: 0
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elif filter == 1: f = lambda a,b,c: a
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elif filter == 2: f = lambda a,b,c: b
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elif filter == 3: f = lambda a,b,c: (a+b)/2
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elif filter == 4: f = paeth
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for x in xrange(0, width*bpp):
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thisline += [(pixeldata[x] + f(thisline[x], prevline[x+bpp], prevline[x])) % 256]
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prevline = thisline
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imgdata += thisline[4:]
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raw = ""
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for x in imgdata:
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raw += struct.pack("B", x)
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#print len(raw), width*height*4
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write_tga(file("test2.tga", "w"), width, height, 32, raw)
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return 0
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load_png(file("butterfly2.png", "rb"))
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