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4f185329f4
This adds a new test decorator: skip_unless_feature(). The argument is the same as passed to features.check(). If the feature is not supported, the test will be skipped. This removes several kinds of boilerplate copied and pasted around tests so test feature checking is handled and displayed more consistently. Refs #4193
73 lines
2.4 KiB
Python
73 lines
2.4 KiB
Python
from PIL import Image
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from .helper import fromstring, skip_unless_feature, tostring
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pytestmark = skip_unless_feature("jpg")
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def draft_roundtrip(in_mode, in_size, req_mode, req_size):
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im = Image.new(in_mode, in_size)
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data = tostring(im, "JPEG")
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im = fromstring(data)
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mode, box = im.draft(req_mode, req_size)
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scale, _ = im.decoderconfig
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assert box[:2] == (0, 0)
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assert (im.width - scale) < box[2] <= im.width
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assert (im.height - scale) < box[3] <= im.height
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return im
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def test_size():
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for in_size, req_size, out_size in [
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((435, 361), (2048, 2048), (435, 361)), # bigger
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((435, 361), (435, 361), (435, 361)), # same
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((128, 128), (64, 64), (64, 64)),
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((128, 128), (32, 32), (32, 32)),
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((128, 128), (16, 16), (16, 16)),
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# large requested width
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((435, 361), (218, 128), (435, 361)), # almost 2x
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((435, 361), (217, 128), (218, 181)), # more than 2x
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((435, 361), (109, 64), (218, 181)), # almost 4x
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((435, 361), (108, 64), (109, 91)), # more than 4x
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((435, 361), (55, 32), (109, 91)), # almost 8x
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((435, 361), (54, 32), (55, 46)), # more than 8x
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((435, 361), (27, 16), (55, 46)), # more than 16x
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# and vice versa
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((435, 361), (128, 181), (435, 361)), # almost 2x
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((435, 361), (128, 180), (218, 181)), # more than 2x
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((435, 361), (64, 91), (218, 181)), # almost 4x
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((435, 361), (64, 90), (109, 91)), # more than 4x
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((435, 361), (32, 46), (109, 91)), # almost 8x
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((435, 361), (32, 45), (55, 46)), # more than 8x
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((435, 361), (16, 22), (55, 46)), # more than 16x
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]:
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im = draft_roundtrip("L", in_size, None, req_size)
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im.load()
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assert im.size == out_size
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def test_mode():
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for in_mode, req_mode, out_mode in [
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("RGB", "1", "RGB"),
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("RGB", "L", "L"),
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("RGB", "RGB", "RGB"),
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("RGB", "YCbCr", "YCbCr"),
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("L", "1", "L"),
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("L", "L", "L"),
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("L", "RGB", "L"),
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("L", "YCbCr", "L"),
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("CMYK", "1", "CMYK"),
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("CMYK", "L", "CMYK"),
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("CMYK", "RGB", "CMYK"),
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("CMYK", "YCbCr", "CMYK"),
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]:
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im = draft_roundtrip(in_mode, (64, 64), req_mode, None)
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im.load()
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assert im.mode == out_mode
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def test_several_drafts():
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im = draft_roundtrip("L", (128, 128), None, (64, 64))
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im.draft(None, (64, 64))
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im.load()
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