* EMF: support negative bounding box coordinates
Similar to placeable WMF, bounding box coordinates
should be interpreted as signed integer, otherwise
opening EMF file with negative (x0,y0) fails.
* Basic load tests for WMF and EMF formats
* WMF/WMF tests: just test open(), not load()
Not sure why load() fails on Debian build. Well, at least we can test
open().
* WMF/EMF: Unpack signed integers using unpack()
* WMF/EMF: Compare to reference PNG rendering
* EMF/WMF comparison: use assert_image_similar()
* Use similarity epsilon 0.5 for WMF, as vector rendering looks different across Windows platforms
* Trigger rebuild
Conflicts:
PIL/OleFileIO.py
I kept Philippe’s version of Unicode decoding that uses UTF-16LE. Pillow
started using Python’s “utf_16” codec in the meantime, but I understand it
uses native byte ordering by default.
There are two main issues fixed with this commit:
* bytes vs. str: All file, image, and palette data are now handled as
bytes. A new _binary module consolidates the hacks needed to do this
across Python versions. tostring/fromstring methods have been renamed to
tobytes/frombytes, but the Python 2.6/2.7 versions alias them to the old
names for compatibility. Users should move to tobytes/frombytes.
One other potentially-breaking change is that text data in image files
(such as tags, comments) are now explicitly handled with a specific
character encoding in mind. This works well with the Unicode str in
Python 3, but may trip up old code expecting a straight byte-for-byte
translation to a Python string. This also required a change to Gohlke's
tags tests (in Tests/test_file_png.py) to expect Unicode strings from
the code.
* True div vs. floor div: Many division operations used the "/" operator
to do floor division, which is now the "//" operator in Python 3. These
were fixed.
As of this commit, on the first pass, I have one failing test (improper
handling of a slice object in a C module, test_imagepath.py) in Python 3,
and three that that I haven't tried running yet (test_imagegl,
test_imagegrab, and test_imageqt). I also haven't tested anything on
Windows. All but the three skipped tests run flawlessly against Pythons
2.6 and 2.7.
