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113 lines
3.4 KiB
ReStructuredText
113 lines
3.4 KiB
ReStructuredText
6.2.0
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-----
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Security
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========
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This release catches several buffer overruns and fixes :cve:`2019-16865`.
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Buffer overruns
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^^^^^^^^^^^^^^^
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In ``RawDecode.c``, an error is now thrown if skip is calculated to be less than
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zero. It is intended to skip padding between lines, not to go backwards.
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In ``PsdImagePlugin``, if the combined sizes of the individual parts is larger than
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the declared size of the extra data field, then it looked for the next layer by
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seeking backwards. This is now corrected by seeking to (the start of the layer
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+ the size of the extra data field) instead of (the read parts of the layer +
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the rest of the layer).
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Decompression bomb checks have been added to GIF and ICO formats.
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An error is now raised if a TIFF dimension is a string, rather than trying to
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perform operations on it.
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:cve:`2019-16865`: Fix DOS attack
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The CVE is regarding DOS problems, such as consuming large amounts of memory,
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or taking a large amount of time to process an image.
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API Additions
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=============
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Text stroking
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^^^^^^^^^^^^^
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``stroke_width`` and ``stroke_fill`` arguments have been added to text drawing
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operations. They allow text to be outlined, setting the width of the stroke and
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and the color respectively. If not provided, ``stroke_fill`` will default to
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the ``fill`` parameter. ::
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from PIL import Image, ImageDraw, ImageFont
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font = ImageFont.truetype("Tests/fonts/FreeMono.ttf", 40)
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font.getsize_multiline("A", stroke_width=2)
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font.getsize("ABC\nAaaa", stroke_width=2)
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im = Image.new("RGB", (100, 100))
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draw = ImageDraw.Draw(im)
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draw.textsize("A", font, stroke_width=2)
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draw.multiline_textsize("ABC\nAaaa", font, stroke_width=2)
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draw.text((10, 10), "A", "#f00", font, stroke_width=2, stroke_fill="#0f0")
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draw.multiline_text((10, 10), "A\nB", "#f00", font,
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stroke_width=2, stroke_fill="#0f0")
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For example, ::
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from PIL import Image, ImageDraw, ImageFont
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im = Image.new("RGB", (120, 130))
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draw = ImageDraw.Draw(im)
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font = ImageFont.truetype("Tests/fonts/FreeMono.ttf", 120)
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draw.text((10, 10), "A", "#f00", font, stroke_width=2, stroke_fill="#0f0")
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creates the following image:
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.. image:: ../../Tests/images/imagedraw_stroke_different.png
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ImageGrab on multi-monitor Windows
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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An ``all_screens`` argument has been added to ``ImageGrab.grab``. If ``True``,
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all monitors will be included in the created image.
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API Changes
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===========
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Image.getexif
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^^^^^^^^^^^^^
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To allow for lazy loading of Exif data, ``Image.getexif()`` now returns a
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shared instance of ``Image.Exif``.
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Deprecations
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^^^^^^^^^^^^
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Image.frombuffer
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~~~~~~~~~~~~~~~~
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There has been a longstanding warning that the defaults of ``Image.frombuffer``
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may change in the future for the "raw" decoder. The change will now take place
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in Pillow 7.0.
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Other Changes
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=============
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Removed bdist_wininst .exe installers
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.exe installers fell out of favour with :pep:`527`, and will be deprecated in
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Python 3.8. Pillow will no longer be distributing them. Wheels should be used
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instead.
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Flags for libwebp in wheels
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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When building libwebp for inclusion in wheels, Pillow now adds the ``-O3`` and
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``-DNDEBUG`` CFLAGS. These flags would be used by default if building libwebp
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without debugging, and using them fixes a significant decrease in speed when
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a wheel-installed copy of Pillow performs libwebp operations.
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