python-pillow/Pillow
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Merge branch 'master' of https://github.com/python-imaging/Pillow

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wiredfool 2013-04-05 11:54:36 -07:00
commit e969b5ae14
3 changed files with 25 additions and 10 deletions
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16
README.rst
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@ -80,6 +80,21 @@ Current platform support for Pillow. Binary distributions are contributed for ea
.. [1] x86 only
.. [2] In some cases, x86 support may indicate 32-bit compilation on 64-bit architecture (vs. compilation on 32-bit hardware).
Donations
---------
You can help fund Pillow development!
.. Note:: New contributors: please add your name (and donation preference) here and send a pull request.
Pillow is a volunteer effort led by Alex Clark. Any contributor interested in receiving donations may add their name (and donation preference) here.
+--------------------------------------+---------------------------------------+
| **Developer** | **Preference** |
+--------------------------------------+---------------------------------------+
| Alex Clark (fork author) | http://gittip.com/aclark4life |
+--------------------------------------+---------------------------------------+
Python Imaging Library
======================
@ -386,4 +401,3 @@ Python Imaging Library
http://mingw.org (compiler)
http://sebsauvage.net/python/mingw.html (build instructions)
http://sourceforge.net/projects/gnuwin32 (prebuilt libraries)

8
Tests/test_file_webp.py
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@ -2,10 +2,10 @@ from tester import *
from PIL import Image
codecs = dir(Image.core)
if "webp_encoder" not in codecs or "webp_decoder" not in codecs:
skip("webp support not available")
try:
import _webp
except:
skip('webp support not installed')
def test_read():
""" Can we write a webp without error. Does it have the bits we expect?"""

11
libImaging/AlphaComposite.c
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@ -69,21 +69,22 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc)
// almost equivalent to:
// tmp = a + (2 << (n-1)), ((tmp >> n) + tmp) >> n
UINT32 tmpr, tmpg, tmpb;
UINT16 blend = dst->a * (255 - src->a);
UINT16 outa255 = src->a * 255 + blend;
// There we use 7 bits for precision.
// We could use more, but we go beyond 32 bits.
UINT16 coef1 = src->a * 255 * 255 * 128 / outa255;
UINT16 coef2 = blend * 255 * 128 / outa255;
UINT16 coef2 = 255 * 128 - coef1;
#define SHIFTFORDIV255(a)\
((a >> 8) + a >> 8)
((((a) >> 8) + a) >> 8)
UINT32 tmpr = src->r * coef1 + dst->r * coef2 + (0x80 << 7);
tmpr = src->r * coef1 + dst->r * coef2 + (0x80 << 7);
out->r = SHIFTFORDIV255(tmpr) >> 7;
UINT32 tmpg = src->g * coef1 + dst->g * coef2 + (0x80 << 7);
tmpg = src->g * coef1 + dst->g * coef2 + (0x80 << 7);
out->g = SHIFTFORDIV255(tmpg) >> 7;
UINT32 tmpb = src->b * coef1 + dst->b * coef2 + (0x80 << 7);
tmpb = src->b * coef1 + dst->b * coef2 + (0x80 << 7);
out->b = SHIFTFORDIV255(tmpb) >> 7;
out->a = SHIFTFORDIV255(outa255 + 0x80);
}