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added dds dxt3 format support

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This commit is contained in:
Andrew Karpushin 2016-08-16 19:26:50 +03:00
parent f12febf3a9
commit 8f8061b774
1 changed files with 35 additions and 0 deletions
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35
PIL/DdsImagePlugin.py
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@ -174,6 +174,38 @@ def _dxtc_alpha(a0, a1, ac0, ac1, ai):
return alpha
def _dxt3(data, width, height):
# TODO implement this function as pixel format in decode.c
ret = bytearray(4 * width * height)
for y in range(0, height, 4):
for x in range(0, width, 4):
ai, c0, c1, code = struct.unpack("<Q2HI",
data.read(16))
r0, g0, b0 = _decode565(c0)
r1, g1, b1 = _decode565(c1)
for j in range(4):
for i in range(4):
alpha = ((ai >> 4 * (4 * j + i)) & 15) * 16
cc = (code >> 2 * (4 * j + i)) & 3
if cc == 0:
r, g, b = r0, g0, b0
elif cc == 1:
r, g, b = r1, g1, b1
elif cc == 2:
r, g, b = _c2a(r0, r1), _c2a(g0, g1), _c2a(b0, b1)
elif cc == 3:
r, g, b = _c3(r0, r1), _c3(g0, g1), _c3(b0, b1)
idx = 4 * ((y + j) * width + (x + i))
ret[idx:idx+4] = struct.pack('4B', r, g, b, alpha)
return bytes(ret)
def _dxt5(data, width, height):
# TODO implement this function as pixel format in decode.c
ret = bytearray(4 * width * height)
@ -240,6 +272,9 @@ class DdsImageFile(ImageFile.ImageFile):
if fourcc == b"DXT1":
self.pixel_format = "DXT1"
codec = _dxt1
elif fourcc == b"DXT3":
self.pixel_format = "DXT3"
codec = _dxt3
elif fourcc == b"DXT5":
self.pixel_format = "DXT5"
codec = _dxt5