#!/usr/bin/python2.4
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"""A simple script to convert asset images to BMP files, that supports
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RGBA image."""
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import struct
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import Image
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import sys
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infile = sys.argv[1]
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outfile = sys.argv[2]
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if not outfile.endswith(".bmp"):
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print >> sys.stderr, "Warning: I'm expecting to write BMP files."
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im = Image.open(infile)
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if im.mode == 'RGB':
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im.save(outfile)
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elif im.mode == 'RGBA':
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# Python Imaging Library doesn't write RGBA BMP files, so we roll
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# our own.
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BMP_HEADER_FMT = ("<" # little-endian
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"H" # signature
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"L" # file size
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"HH" # reserved (set to 0)
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"L" # offset to start of bitmap data)
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)
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BITMAPINFO_HEADER_FMT= ("<" # little-endian
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"L" # size of this struct
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"L" # width
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"L" # height
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"H" # planes (set to 1)
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"H" # bit count
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"L" # compression (set to 0 for minui)
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"L" # size of image data (0 if uncompressed)
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"L" # x pixels per meter (1)
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"L" # y pixels per meter (1)
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"L" # colors used (0)
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"L" # important colors (0)
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)
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fileheadersize = struct.calcsize(BMP_HEADER_FMT)
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infoheadersize = struct.calcsize(BITMAPINFO_HEADER_FMT)
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header = struct.pack(BMP_HEADER_FMT,
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0x4d42, # "BM" in little-endian
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(fileheadersize + infoheadersize +
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im.size[0] * im.size[1] * 4),
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0, 0,
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fileheadersize + infoheadersize)
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info = struct.pack(BITMAPINFO_HEADER_FMT,
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infoheadersize,
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im.size[0],
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im.size[1],
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1,
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32,
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0,
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0,
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1,
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1,
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0,
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0)
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f = open(outfile, "wb")
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f.write(header)
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f.write(info)
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data = im.tostring()
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for j in range(im.size[1]-1, -1, -1): # rows bottom-to-top
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for i in range(j*im.size[0]*4, (j+1)*im.size[0]*4, 4):
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f.write(data[i+2]) # B
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f.write(data[i+1]) # G
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f.write(data[i+0]) # R
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f.write(data[i+3]) # A
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f.close()
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else:
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print >> sys.stderr, "Don't know how to handle image mode '%s'." % (im.mode,)
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