def decode(self, file, filename):
header = file.read(DDSURFACEDESC2.get_size())
desc = DDSURFACEDESC2(header)
if desc.dwMagic != b'DDS ' or desc.dwSize != 124:
raise DDSException('Invalid DDS file (incorrect header).')
width = desc.dwWidth
height = desc.dwHeight
mipmaps = 1
if desc.dwFlags & DDSD_DEPTH:
raise DDSException('Volume DDS files unsupported')
if desc.dwFlags & DDSD_MIPMAPCOUNT:
mipmaps = desc.dwMipMapCount
if desc.ddpfPixelFormat.dwSize != 32:
raise DDSException('Invalid DDS file (incorrect pixel format).')
if desc.dwCaps2 & DDSCAPS2_CUBEMAP:
raise DDSException('Cubemap DDS files unsupported')
if not desc.ddpfPixelFormat.dwFlags & DDPF_FOURCC:
raise DDSException('Uncompressed DDS textures not supported.')
has_alpha = desc.ddpfPixelFormat.dwRGBAlphaBitMask != 0
selector = (desc.ddpfPixelFormat.dwFourCC, has_alpha)
if selector not in _compression_formats:
raise DDSException('Unsupported texture compression %s' % \
desc.ddpfPixelFormat.dwFourCC)
dformat, decoder = _compression_formats[selector]
if dformat == GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
block_size = 8
else:
block_size = 16
datas = []
w, h = width, height
for i in range(mipmaps):
if not w and not h:
break
if not w:
w = 1
if not h:
h = 1
size = ((w + 3) // 4) * ((h + 3) // 4) * block_size
data = file.read(size)
datas.append(data)
w >>= 1
h >>= 1
image = CompressedImageData(width, height, dformat, datas[0],
'GL_EXT_texture_compression_s3tc', decoder)
level = 0
for data in datas[1:]:
level += 1
image.set_mipmap_data(level, data)
return image
def decode(self, file, filename):
header = file.read(DDSURFACEDESC2.get_size())
desc = DDSURFACEDESC2(header)
if desc.dwMagic != 'DDS ' or desc.dwSize != 124:
raise DDSException('Invalid DDS file (incorrect header).')
width = desc.dwWidth
height = desc.dwHeight
mipmaps = 1
if desc.dwFlags & DDSD_DEPTH:
raise DDSException('Volume DDS files unsupported')
if desc.dwFlags & DDSD_MIPMAPCOUNT:
mipmaps = desc.dwMipMapCount
if desc.ddpfPixelFormat.dwSize != 32:
raise DDSException('Invalid DDS file (incorrect pixel format).')
if desc.dwCaps2 & DDSCAPS2_CUBEMAP:
raise DDSException('Cubemap DDS files unsupported')
if not desc.ddpfPixelFormat.dwFlags & DDPF_FOURCC:
raise DDSException('Uncompressed DDS textures not supported.')
has_alpha = desc.ddpfPixelFormat.dwRGBAlphaBitMask != 0
format, decoder = _compression_formats.get(
(desc.ddpfPixelFormat.dwFourCC, has_alpha), None)
if not format:
raise DDSException('Unsupported texture compression %s' % \
desc.ddpfPixelFormat.dwFourCC)
if format == GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
block_size = 8
else:
block_size = 16
datas = []
w, h = width, height
for i in range(mipmaps):
if not w and not h:
break
if not w:
w = 1
if not h:
h = 1
size = ((w + 3) / 4) * ((h + 3) / 4) * block_size
data = file.read(size)
datas.append(data)
w >>= 1
h >>= 1
image = CompressedImageData(width, height, format, datas[0],
'GL_EXT_texture_compression_s3tc', decoder)
level = 0
for data in datas[1:]:
level += 1
image.set_mipmap_data(level, data)
return image
