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add unpacking from BRGa

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This commit is contained in:
Arjen Nienhuis 2016-08-06 10:54:58 +02:00 committed by homm
parent bc2c933552
commit 2ecbcce415
2 changed files with 27 additions and 0 deletions
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2
Tests/test_lib_pack.py
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@ -122,7 +122,9 @@ class TestLibPack(PillowTestCase):
self.assertEqual(unpack("RGB", "XBGR", 4), (4, 3, 2))
self.assertEqual(unpack("RGBA", "RGBA", 4), (1, 2, 3, 4))
self.assertEqual(unpack("RGBA", "RGBa", 4), (63, 127, 191, 4))
self.assertEqual(unpack("RGBA", "BGRA", 4), (3, 2, 1, 4))
self.assertEqual(unpack("RGBA", "BGRa", 4), (191, 127, 63, 4))
self.assertEqual(unpack("RGBA", "ARGB", 4), (2, 3, 4, 1))
self.assertEqual(unpack("RGBA", "ABGR", 4), (4, 3, 2, 1))
self.assertEqual(unpack("RGBA", "RGBA;15", 2), (8, 131, 0, 0))

25
libImaging/Unpack.c
View File

@ -747,6 +747,30 @@ unpackRGBa(UINT8* out, const UINT8* in, int pixels)
}
}
static void
unpackBGRa(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* premultiplied BGRA */
for (i = 0; i < pixels; i++) {
int a = in[3];
if (!a)
out[R] = out[G] = out[B] = out[A] = 0;
else if (a == 255) {
out[R] = in[2];
out[G] = in[1];
out[B] = in[0];
out[A] = a;
} else {
out[R] = CLIP(in[2] * 255 / a);
out[G] = CLIP(in[1] * 255 / a);
out[B] = CLIP(in[0] * 255 / a);
out[A] = a;
}
out += 4; in += 4;
}
}
static void
unpackRGBAI(UINT8* out, const UINT8* in, int pixels)
{
@ -1206,6 +1230,7 @@ static struct {
{"RGBA", "LA;16B", 32, unpackRGBALA16B},
{"RGBA", "RGBA", 32, copy4},
{"RGBA", "RGBa", 32, unpackRGBa},
{"RGBA", "BGRa", 32, unpackBGRa},
{"RGBA", "RGBA;I", 32, unpackRGBAI},
{"RGBA", "RGBA;L", 32, unpackRGBAL},
{"RGBA", "RGBA;15", 16, ImagingUnpackRGBA15},