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#!/usr/bin/env python
import sys, os.path
import Image
def enc_backbuffer(backbuffer):
"""Helper function for RLE compression, encodes a string of uncompressable data."""
compdata = []
if len(backbuffer) == 0:
return compdata
while len(backbuffer) > 128:
compdata.append(127)
compdata.extend(backbuffer[0:128])
backbuffer = backbuffer[128:]
compdata.append(len(backbuffer)-1)
compdata.extend(backbuffer)
return compdata
def compress_rle(rawdata):
"""Compresses the string using a RLE scheme."""
compdata = []
backbuffer = []
while len(rawdata) >= 3:
c = rawdata[0]
if rawdata[1] == c and rawdata[2] == c:
runlength = 3
while runlength < 130 and len(rawdata) > runlength:
if rawdata[runlength] == c:
runlength = runlength + 1
else:
break
compdata.extend(enc_backbuffer(backbuffer))
backbuffer = []
compdata.append(runlength + 125)
compdata.append(c)
rawdata = rawdata[runlength:]
else:
backbuffer.append(c)
rawdata = rawdata[1:]
backbuffer.extend(rawdata)
compdata.extend(enc_backbuffer(backbuffer))
return compdata
def encode_plane(rawdata, planename):
"""Encodes the data of a single plane."""
rawlen = len(rawdata)
compdata = compress_rle(rawdata)
complen = len(compdata)
print " plane %s: compressed %d to %d (%.1f%%)" % (planename, rawlen, complen, float(complen) / float(rawlen) * 100.0)
return compdata
### main loop
print "mkegemb 0.1, Copyright (c) 2006 Christoph Pfisterer"
planenames = ( "blue", "green", "red", "alpha", "grey" )
for filename in sys.argv[1:]:
origimage = Image.open(filename)
(width, height) = origimage.size
mode = origimage.mode
data = origimage.getdata()
print "%s: %d x %d %s" % (filename, width, height, mode)
(basename, extension) = os.path.splitext(filename)
identname = basename.replace("-", "_")
# extract image data from PIL object
planes = [ [], [], [], [] ]
if mode == "RGB":
for pixcount in range(0, width*height):
pixeldata = data[pixcount]
planes[0].append(pixeldata[0])
planes[1].append(pixeldata[1])
planes[2].append(pixeldata[2])
elif mode == "RGBA":
for pixcount in range(0, width*height):
pixeldata = data[pixcount]
planes[0].append(pixeldata[0])
planes[1].append(pixeldata[1])
planes[2].append(pixeldata[2])
planes[3].append(pixeldata[3])
elif mode == "L":
for pixcount in range(0, width*height):
pixeldata = data[pixcount]
planes[0].append(pixeldata)
planes[1].append(pixeldata)
planes[2].append(pixeldata)
else:
print " Error: Mode not supported!"
continue
# special treatment for fonts
if basename[0:4] == "font":
if planes[0] != planes[1] or planes[0] != planes[2]:
print " Error: Font detected, but it is not greyscale!"
continue
print " font detected, encoding as alpha-only"
# invert greyscale values for use as alpha
planes[3] = map(lambda x: 255-x, planes[0])
planes[0] = []
planes[1] = []
planes[2] = []
# encode planes
imagedata = []
pixelformat = "EG_EIPIXELMODE"
if len(planes[0]) > 0 and planes[0] == planes[1] and planes[0] == planes[2]:
print " encoding as greyscale"
imagedata.extend(encode_plane(planes[0], planenames[4]))
pixelformat = pixelformat + "_GRAY"
elif len(planes[0]) > 0:
print " encoding as true color"
imagedata.extend(encode_plane(planes[0], planenames[0]))
imagedata.extend(encode_plane(planes[1], planenames[1]))
imagedata.extend(encode_plane(planes[2], planenames[2]))
pixelformat = pixelformat + "_COLOR"
if len(planes[3]) > 0:
if reduce(lambda x,y: x+y, planes[3]) == 0:
print " skipping alpha plane because it is empty"
else:
imagedata.extend(encode_plane(planes[3], planenames[3]))
pixelformat = pixelformat + "_ALPHA"
# generate compilable header file
output = "static const UINT8 egemb_%s_data[%d] = {\n" % (identname, len(imagedata))
for i in range(0, len(imagedata)):
output = output + " 0x%02x," % imagedata[i]
if (i % 12) == 11:
output = output + "\n"
output = output + "\n};\n"
output = output + "static EG_EMBEDDED_IMAGE egemb_%s = { %d, %d, %s, EG_EICOMPMODE_RLE, egemb_%s_data, %d };\n" % (identname, width, height, pixelformat, identname, len(imagedata))
f = file("egemb_%s.h" % identname, "w")
f.write(output)
f.close()
print "Done!"
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