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Note internal functions and TODOs

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This commit is contained in:
hugovk 2016-01-06 20:00:03 +02:00
parent 05b22cedd5
commit 37b5a39c58
1 changed files with 11 additions and 9 deletions
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20
PIL/DdsImagePlugin.py
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@ -93,7 +93,7 @@ DXT3_FOURCC = 0x33545844
DXT5_FOURCC = 0x35545844 DXT5_FOURCC = 0x35545844
def decode565(bits): def _decode565(bits):
a = ((bits >> 11) & 0x1f) << 3 a = ((bits >> 11) & 0x1f) << 3
b = ((bits >> 5) & 0x3f) << 2 b = ((bits >> 5) & 0x3f) << 2
c = (bits & 0x1f) << 3 c = (bits & 0x1f) << 3
@ -112,15 +112,16 @@ def _c3(a, b):
return (2 * b + a) // 3 return (2 * b + a) // 3
def dxt1(data, width, height): def _dxt1(data, width, height):
# TODO implement this function as pixel format in decode.c
ret = bytearray(4 * width * height) ret = bytearray(4 * width * height)
for y in range(0, height, 4): for y in range(0, height, 4):
for x in range(0, width, 4): for x in range(0, width, 4):
color0, color1, bits = struct.unpack("<HHI", data.read(8)) color0, color1, bits = struct.unpack("<HHI", data.read(8))
r0, g0, b0 = decode565(color0) r0, g0, b0 = _decode565(color0)
r1, g1, b1 = decode565(color1) r1, g1, b1 = _decode565(color1)
# Decode this block into 4x4 pixels # Decode this block into 4x4 pixels
for j in range(4): for j in range(4):
@ -173,7 +174,8 @@ def _dxtc_alpha(a0, a1, ac0, ac1, ai):
return alpha return alpha
def dxt5(data, width, height): def _dxt5(data, width, height):
# TODO implement this function as pixel format in decode.c
ret = bytearray(4 * width * height) ret = bytearray(4 * width * height)
for y in range(0, height, 4): for y in range(0, height, 4):
@ -181,8 +183,8 @@ def dxt5(data, width, height):
a0, a1, ac0, ac1, c0, c1, code = struct.unpack("<2BHI2HI", a0, a1, ac0, ac1, c0, c1, code = struct.unpack("<2BHI2HI",
data.read(16)) data.read(16))
r0, g0, b0 = decode565(c0) r0, g0, b0 = _decode565(c0)
r1, g1, b1 = decode565(c1) r1, g1, b1 = _decode565(c1)
for j in range(4): for j in range(4):
for i in range(4): for i in range(4):
@ -234,10 +236,10 @@ class DdsImageFile(ImageFile.ImageFile):
if fourcc == b"DXT1": if fourcc == b"DXT1":
self.pixel_format = "DXT1" self.pixel_format = "DXT1"
codec = dxt1 codec = _dxt1
elif fourcc == b"DXT5": elif fourcc == b"DXT5":
self.pixel_format = "DXT5" self.pixel_format = "DXT5"
codec = dxt5 codec = _dxt5
else: else:
raise NotImplementedError("Unimplemented pixel format %r" % raise NotImplementedError("Unimplemented pixel format %r" %
(fourcc)) (fourcc))