'''
DDS File library
================
This library can be used to parse and save DDS
(`DirectDraw Surface <https://en.wikipedia.org/wiki/DirectDraw_Surface>`)
files.
The initial version was written by::
Alexey Borzenkov (snaury@gmail.com)
All the initial work credits go to him! Thank you :)
This version uses structs instead of ctypes.
DDS Format
----------
::
[DDS ][SurfaceDesc][Data]
[SurfaceDesc]:: (everything is uint32)
Size
Flags
Height
Width
PitchOrLinearSize
Depth
MipmapCount
Reserved1 * 11
[PixelFormat]::
Size
Flags
FourCC
RGBBitCount
RBitMask
GBitMask
BBitMask
ABitMask
[Caps]::
Caps1
Caps2
Reserved1 * 2
Reserverd2
.. warning::
This is an external library and Kivy does not provide any support for it.
It might change in the future and we advise you don't rely on it in your
code.
'''
from struct import pack, unpack, calcsize
# DDSURFACEDESC2 dwFlags
DDSD_CAPS = 0x00000001
DDSD_HEIGHT = 0x00000002
DDSD_WIDTH = 0x00000004
DDSD_PITCH = 0x00000008
DDSD_PIXELFORMAT = 0x00001000
DDSD_MIPMAPCOUNT = 0x00020000
DDSD_LINEARSIZE = 0x00080000
DDSD_DEPTH = 0x00800000
# DDPIXELFORMAT dwFlags
DDPF_ALPHAPIXELS = 0x00000001
DDPF_FOURCC = 0x00000004
DDPF_RGB = 0x00000040
DDPF_LUMINANCE = 0x00020000
# DDSCAPS2 dwCaps1
DDSCAPS_COMPLEX = 0x00000008
DDSCAPS_TEXTURE = 0x00001000
DDSCAPS_MIPMAP = 0x00400000
# DDSCAPS2 dwCaps2
DDSCAPS2_CUBEMAP = 0x00000200
DDSCAPS2_CUBEMAP_POSITIVEX = 0x00000400
DDSCAPS2_CUBEMAP_NEGATIVEX = 0x00000800
DDSCAPS2_CUBEMAP_POSITIVEY = 0x00001000
DDSCAPS2_CUBEMAP_NEGATIVEY = 0x00002000
DDSCAPS2_CUBEMAP_POSITIVEZ = 0x00004000
DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x00008000
DDSCAPS2_VOLUME = 0x00200000
# Common FOURCC codes
DDS_DXTN = 0x00545844
DDS_DXT1 = 0x31545844
DDS_DXT2 = 0x32545844
DDS_DXT3 = 0x33545844
DDS_DXT4 = 0x34545844
DDS_DXT5 = 0x35545844
def dxt_to_str(dxt):
if dxt == DDS_DXT1:
return 's3tc_dxt1'
elif dxt == DDS_DXT2:
return 's3tc_dxt2'
elif dxt == DDS_DXT3:
return 's3tc_dxt3'
elif dxt == DDS_DXT4:
return 's3tc_dxt4'
elif dxt == DDS_DXT5:
return 's3tc_dxt5'
elif dxt == 0:
return 'rgba'
elif dxt == 1:
return 'alpha'
elif dxt == 2:
return 'luminance'
elif dxt == 3:
return 'luminance_alpha'
def str_to_dxt(dxt):
if dxt == 's3tc_dxt1':
return DDS_DXT1
if dxt == 's3tc_dxt2':
return DDS_DXT2
if dxt == 's3tc_dxt3':
return DDS_DXT3
if dxt == 's3tc_dxt4':
return DDS_DXT4
if dxt == 's3tc_dxt5':
return DDS_DXT5
if dxt == 'rgba':
return 0
if dxt == 'alpha':
return 1
if dxt == 'luminance':
return 2
if dxt == 'luminance_alpha':
return 3
def align_value(val, b):
return val + (-val % b)
def check_flags(val, fl):
return (val & fl) == fl
def dxt_size(w, h, dxt):
w = max(1, w // 4)
h = max(1, h // 4)
if dxt == DDS_DXT1:
return w * h * 8
elif dxt in (DDS_DXT2, DDS_DXT3, DDS_DXT4, DDS_DXT5):
return w * h * 16
return -1
[docs]class QueryDict(dict):
def __getattr__(self, attr):
try:
return self.__getitem__(attr)
except KeyError:
try:
return super(QueryDict, self).__getattr__(attr)
except AttributeError:
raise KeyError(attr)
def __setattr__(self, attr, value):
self.__setitem__(attr, value)
[docs]class DDSException(Exception):
pass
class DDSFile(object):
fields = (
('size', 0), ('flags', 1), ('height', 2),
('width', 3), ('pitchOrLinearSize', 4), ('depth', 5),
('mipmapCount', 6), ('pf_size', 18), ('pf_flags', 19),
('pf_fourcc', 20), ('pf_rgbBitCount', 21), ('pf_rBitMask', 22),
('pf_gBitMask', 23), ('pf_bBitMask', 24), ('pf_aBitMask', 25),
('caps1', 26), ('caps2', 27))
def __init__(self, filename=None):
super(DDSFile, self).__init__()
self._dxt = 0
self._fmt = None
self.meta = meta = QueryDict()
self.count = 0
self.images = []
self.images_size = []
for field, index in DDSFile.fields:
meta[field] = 0
if filename:
self.load(filename)
def load(self, filename):
self.filename = filename
with open(filename, 'rb') as fd:
data = fd.read()
# ensure magic
if data[:4] != 'DDS ':
raise DDSException('Invalid magic header')
# read header
fmt = 'I' * 31
fmt_size = calcsize(fmt)
pf_size = calcsize('I' * 8)
header, data = data[4:4+fmt_size], data[4+fmt_size:]
if len(header) != fmt_size:
raise DDSException('Truncated header in')
# depack
header = unpack(fmt, header)
meta = self.meta
for name, index in DDSFile.fields:
meta[name] = header[index]
# check header validity
if meta.size != fmt_size:
raise DDSException('Invalid header size (%d instead of %d)' %
(meta.size, fmt_size))
if meta.pf_size != pf_size:
raise DDSException('Invalid pixelformat size (%d instead of %d)' %
(meta.pf_size, pf_size))
if not check_flags(meta.flags,
DDSD_CAPS | DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT):
raise DDSException('Not enough flags')
if not check_flags(meta.caps1, DDSCAPS_TEXTURE):
raise DDSException('Not a DDS texture')
self.count = 1
if check_flags(meta.flags, DDSD_MIPMAPCOUNT):
if not check_flags(meta.caps1, DDSCAPS_COMPLEX | DDSCAPS_MIPMAP):
raise DDSException('Invalid mipmap without flags')
self.count = meta.mipmapCount
hasrgb = check_flags(meta.pf_flags, DDPF_RGB)
hasalpha = check_flags(meta.pf_flags, DDPF_ALPHAPIXELS)
hasluminance = check_flags(meta.pf_flags, DDPF_LUMINANCE)
bpp = None
dxt = block = pitch = 0
if hasrgb or hasalpha or hasluminance:
bpp = meta.pf_rgbBitCount
if hasrgb and hasluminance:
raise DDSException('File have RGB and Luminance')
if hasrgb:
dxt = 0
elif hasalpha and not hasluminance:
dxt = 1
elif hasluminance and not hasalpha:
dxt = 2
elif hasalpha and hasluminance:
dxt = 3
elif check_flags(meta.pf_flags, DDPF_FOURCC):
dxt = meta.pf_fourcc
if dxt not in (DDS_DXT1, DDS_DXT2, DDS_DXT3, DDS_DXT4, DDS_DXT5):
raise DDSException('Unsupported FOURCC')
else:
raise DDSException('Unsupported format specified')
if bpp:
block = align_value(bpp, 8) // 8
pitch = align_value(block * meta.width, 4)
if check_flags(meta.flags, DDSD_LINEARSIZE):
if dxt in (0, 1, 2, 3):
size = pitch * meta.height
else:
size = dxt_size(meta.width, meta.height, dxt)
w = meta.width
h = meta.height
images = self.images
images_size = self.images_size
for i in range(self.count):
if dxt in (0, 1, 2, 3):
size = align_value(block * w, 4) * h
else:
size = dxt_size(w, h, dxt)
image, data = data[:size], data[size:]
if len(image) < size:
raise DDSException('Truncated image for mipmap %d' % i)
images_size.append((w, h))
images.append(image)
if w == 1 and h == 1:
break
w = max(1, w // 2)
h = max(1, h // 2)
if len(images) == 0:
raise DDSException('No images available')
if len(images) < self.count:
raise DDSException('Not enough images')
self._dxt = dxt
def save(self, filename):
if len(self.images) == 0:
raise DDSException('No images to save')
fields = dict(DDSFile.fields)
fields_keys = list(fields.keys())
fields_index = list(fields.values())
mget = self.meta.get
header = []
for idx in range(31):
if idx in fields_index:
value = mget(fields_keys[fields_index.index(idx)], 0)
else:
value = 0
header.append(value)
with open(filename, 'wb') as fd:
fd.write('DDS ')
fd.write(pack('I' * 31, *header))
for image in self.images:
fd.write(image)
def add_image(self, level, bpp, fmt, width, height, data):
assert(bpp == 32)
assert(fmt in ('rgb', 'rgba', 'dxt1', 'dxt2', 'dxt3', 'dxt4', 'dxt5'))
assert(width > 0)
assert(height > 0)
assert(level >= 0)
meta = self.meta
images = self.images
if len(images) == 0:
assert(level == 0)
# first image, set defaults !
for k in meta.keys():
meta[k] = 0
self._fmt = fmt
meta.size = calcsize('I' * 31)
meta.pf_size = calcsize('I' * 8)
meta.pf_flags = 0
meta.flags = DDSD_CAPS | DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT
meta.width = width
meta.height = height
meta.caps1 = DDSCAPS_TEXTURE
meta.flags |= DDSD_LINEARSIZE
meta.pitchOrLinearSize = len(data)
meta.pf_rgbBitCount = 32
meta.pf_rBitMask = 0x00ff0000
meta.pf_gBitMask = 0x0000ff00
meta.pf_bBitMask = 0x000000ff
meta.pf_aBitMask = 0xff000000
if fmt in ('rgb', 'rgba'):
assert(True)
assert(bpp == 32)
meta.pf_flags |= DDPF_RGB
meta.pf_rgbBitCount = 32
meta.pf_rBitMask = 0x00ff0000
meta.pf_gBitMask = 0x0000ff00
meta.pf_bBitMask = 0x000000ff
meta.pf_aBitMask = 0x00000000
if fmt == 'rgba':
meta.pf_flags |= DDPF_ALPHAPIXELS
meta.pf_aBitMask = 0xff000000
else:
meta.pf_flags |= DDPF_FOURCC
if fmt == 'dxt1':
meta.pf_fourcc = DDS_DXT1
elif fmt == 'dxt2':
meta.pf_fourcc = DDS_DXT2
elif fmt == 'dxt3':
meta.pf_fourcc = DDS_DXT3
elif fmt == 'dxt4':
meta.pf_fourcc = DDS_DXT4
elif fmt == 'dxt5':
meta.pf_fourcc = DDS_DXT5
images.append(data)
else:
assert(level == len(images))
assert(fmt == self._fmt)
images.append(data)
meta.flags |= DDSD_MIPMAPCOUNT
meta.caps1 |= DDSCAPS_COMPLEX | DDSCAPS_MIPMAP
meta.mipmapCount = len(images)
def __repr__(self):
return '<DDSFile filename=%r size=%r dxt=%r len(images)=%r>' % (
self.filename, self.size, self.dxt, len(self.images))
def _get_size(self):
meta = self.meta
return meta.width, meta.height
def _set_size(self, size):
self.meta.update({'width': size[0], 'height': size[1]})
size = property(_get_size, _set_size)
def _get_dxt(self):
return dxt_to_str(self._dxt)
def _set_dxt(self, dxt):
self._dxt = str_to_dxt(dxt)
dxt = property(_get_dxt, _set_dxt)
if __name__ == '__main__':
import sys
if len(sys.argv) == 1:
print('Usage: python ddsfile.py <file1> <file2> ...')
sys.exit(0)
for filename in sys.argv[1:]:
print('=== Loading', filename)
try:
dds = DDSFile(filename=filename)
print(dds)
dds.save('bleh.dds')
except IOError as e:
print('ERR>', e)
except DDSException as e:
print('DDS>', e)
