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#!/usr/bin/python
'''
Generate 'ETC1' texture with mipmaps in dds format from an image file.
'''
# Copyright (c) 2012-2013 Wladimir J. van der Laan
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sub license,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the
# next paragraph) shall be included in all copies or substantial portions
# of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
from __future__ import print_function, division, unicode_literals
import struct, sys, PIL, os
from PIL import Image
import argparse, tempfile
from subprocess import call
DDS_MAGIC = 0x20534444
DDS_UINT32 = b'<I'
FOURCC_ETC1 = struct.unpack(DDS_UINT32, b'ETC1')[0] # custom FOURCC
ETC1TOOL = 'etc1tool' # Android ETC1 tool, needs to be in PATH
def main():
parser = argparse.ArgumentParser(description='Generate mipmaps from image and compress to ETC1 dds.')
parser.add_argument('input', metavar='INFILE', type=str,
help='Input file (usually .png or .jpg)')
parser.add_argument('output', metavar='OUTFILE', type=str,
help='Output file (.dds)')
args = parser.parse_args()
img = Image.open(args.input)
orig_width = width = img.size[0]
orig_height = height = img.size[1]
assert(width > 0 and height > 0)
(fd, tmpout) = tempfile.mkstemp(suffix='.png')
os.close(fd) # won't be using the already-opened fd
(fd, tmpout2) = tempfile.mkstemp(suffix='.pkm')
os.close(fd)
mip = 0
mips = []
while True:
print('Generating mip %i: %ix%i' % (mip, width, height))
img.save(tmpout)
call([ETC1TOOL, '--encodeNoHeader', tmpout, '-o', tmpout2])
with open(tmpout2, 'rb') as f:
data = f.read()
print(' compressed size: %i' % len(data))
mips.append(data)
# Go to next mip level
if width == 1 and height == 1: # 1x1 reached
break
width = (width+1) >> 1
height = (height+1) >> 1
mip += 1
img = img.resize((width, height), PIL.Image.ANTIALIAS)
with open(args.output, 'wb') as f:
# Write dds header
hdrdata = [0] * (128//4)
hdrdata[0] = DDS_MAGIC # dwMagic
hdrdata[1] = 124 # dwSize
hdrdata[2] = 0x000A1007 # dwFlags (CAPS, WIDTH, HEIGHT, PIXELFORMAT, MIPMAPCOUNT, LINEARSIZE)
hdrdata[3] = orig_height # dwHeight
hdrdata[4] = orig_width # dwWidth
hdrdata[5] = len(mips[0]) # dwPitchOrLinearSize
hdrdata[6] = 0 # dwDepth
hdrdata[7] = len(mips) # dwMipMapCount
hdrdata[19] = 32 # sPixelFormat.dwSize
hdrdata[20] = 4 # sPixelFormat.dwFlags = DDPF_FOURCC
hdrdata[21] = FOURCC_ETC1 # sPixelFormat.dwFourCC
hdrdata[27] = 0x00401008 # sCaps.dwCaps1 (COMPLEX, TEXTURE, MIPMAP)
f.write(struct.pack(b'<32I', *hdrdata))
for mip in mips:
f.write(mip)
if __name__ == '__main__':
main()
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