1 #!/usr/bin/python2.4 2 3 """A simple script to convert asset images to BMP files, that supports 4 RGBA image.""" 5 6 import struct 7 import Image 8 import sys 9 10 infile = sys.argv[1] 11 outfile = sys.argv[2] 12 13 if not outfile.endswith(".bmp"): 14 print >> sys.stderr, "Warning: I'm expecting to write BMP files." 15 16 im = Image.open(infile) 17 if im.mode == 'RGB': 18 im.save(outfile) 19 elif im.mode == 'RGBA': 20 # Python Imaging Library doesn't write RGBA BMP files, so we roll 21 # our own. 22 23 BMP_HEADER_FMT = ("<" # little-endian 24 "H" # signature 25 "L" # file size 26 "HH" # reserved (set to 0) 27 "L" # offset to start of bitmap data) 28 ) 29 30 BITMAPINFO_HEADER_FMT= ("<" # little-endian 31 "L" # size of this struct 32 "L" # width 33 "L" # height 34 "H" # planes (set to 1) 35 "H" # bit count 36 "L" # compression (set to 0 for minui) 37 "L" # size of image data (0 if uncompressed) 38 "L" # x pixels per meter (1) 39 "L" # y pixels per meter (1) 40 "L" # colors used (0) 41 "L" # important colors (0) 42 ) 43 44 fileheadersize = struct.calcsize(BMP_HEADER_FMT) 45 infoheadersize = struct.calcsize(BITMAPINFO_HEADER_FMT) 46 47 header = struct.pack(BMP_HEADER_FMT, 48 0x4d42, # "BM" in little-endian 49 (fileheadersize + infoheadersize + 50 im.size[0] * im.size[1] * 4), 51 0, 0, 52 fileheadersize + infoheadersize) 53 54 info = struct.pack(BITMAPINFO_HEADER_FMT, 55 infoheadersize, 56 im.size[0], 57 im.size[1], 58 1, 59 32, 60 0, 61 0, 62 1, 63 1, 64 0, 65 0) 66 67 f = open(outfile, "wb") 68 f.write(header) 69 f.write(info) 70 data = im.tostring() 71 for j in range(im.size[1]-1, -1, -1): # rows bottom-to-top 72 for i in range(j*im.size[0]*4, (j+1)*im.size[0]*4, 4): 73 f.write(data[i+2]) # B 74 f.write(data[i+1]) # G 75 f.write(data[i+0]) # R 76 f.write(data[i+3]) # A 77 f.close() 78 else: 79 print >> sys.stderr, "Don't know how to handle image mode '%s'." % (im.mode,) 80
