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Merge pull request #1 from radarhere/ico-append-images

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ICO append images suggestions
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ziplantil 2020-12-11 12:28:00 +02:00 committed by GitHub
commit 0722870564
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3 changed files with 17 additions and 12 deletions
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12
Tests/test_file_ico.py
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@ -87,19 +87,15 @@ def test_only_save_relevant_sizes(tmp_path):
def test_only_save_append_images(tmp_path):
"""append_images should work to provide alternative sizes"""
im = hopper()
provided_im = Image.new("RGBA", (32, 32), (255, 0, 0, 255))
im = hopper("RGBA")
provided_im = Image.new("RGBA", (32, 32), (255, 0, 0))
outfile = str(tmp_path / "temp_saved_multi_icon.ico")
im.save(outfile, sizes=[(32, 32), (64, 64)], append_images=[provided_im])
im.save(outfile, sizes=[(32, 32), (128, 128)], append_images=[provided_im])
with Image.open(outfile) as reread:
reread.size = (64, 64)
reread.load()
assert_image_equal(reread, hopper().resize((64, 64), Image.LANCZOS))
assert_image_equal(reread, hopper("RGBA"))
with Image.open(outfile) as reread:
reread.size = (32, 32)
reread.load()
assert_image_equal(reread, provided_im)

13
docs/handbook/image-file-formats.rst
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@ -127,8 +127,8 @@ following options are available::
images in the list can be single or multiframe images.
This is currently supported for GIF, PDF, TIFF, and WebP.
It is also supported for ICNS. If images are passed in of relevant sizes,
they will be used instead of scaling down the main image.
It is also supported for ICO and ICNS. If images are passed in of relevant
sizes, they will be used instead of scaling down the main image.
**include_color_table**
Whether or not to include local color table.
@ -238,6 +238,15 @@ The :py:meth:`~PIL.Image.Image.save` method supports the following options:
(64, 64), (128, 128), (256, 256)]``. Any sizes bigger than the original
size or 256 will be ignored.
The :py:meth:`~PIL.Image.Image.save` method can take the following keyword arguments:
**append_images**
A list of images to replace the scaled down versions of the image.
The order of the images does not matter, as their use is determined by
the size of each image.
.. versionadded:: 8.1.0
IM
^^

4
src/PIL/IcoImagePlugin.py
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@ -52,7 +52,7 @@ def _save(im, fp, filename):
sizes = list(sizes)
fp.write(struct.pack("<H", len(sizes))) # idCount(2)
offset = fp.tell() + len(sizes) * 16
alt_images = {im.size: im for im in im.encoderinfo.get("append_images", [])}
provided_images = {im.size: im for im in im.encoderinfo.get("append_images", [])}
for size in sizes:
width, height = size
# 0 means 256
@ -64,7 +64,7 @@ def _save(im, fp, filename):
fp.write(struct.pack("<H", 32)) # wBitCount(2)
image_io = BytesIO()
tmp = alt_images.get(size)
tmp = provided_images.get(size)
if not tmp:
# TODO: invent a more convenient method for proportional scalings
tmp = im.copy()