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from PIL import Image
from .helper import fromstring, skip_unless_feature, tostring
pytestmark = skip_unless_feature("jpg")
def draft_roundtrip(in_mode, in_size, req_mode, req_size):
im = Image.new(in_mode, in_size)
data = tostring(im, "JPEG")
im = fromstring(data)
mode, box = im.draft(req_mode, req_size)
scale, _ = im.decoderconfig
assert box[:2] == (0, 0)
assert (im.width - scale) < box[2] <= im.width
assert (im.height - scale) < box[3] <= im.height
return im
def test_size():
for in_size, req_size, out_size in [
((435, 361), (2048, 2048), (435, 361)), # bigger
((435, 361), (435, 361), (435, 361)), # same
((128, 128), (64, 64), (64, 64)),
((128, 128), (32, 32), (32, 32)),
((128, 128), (16, 16), (16, 16)),
# large requested width
((435, 361), (218, 128), (435, 361)), # almost 2x
((435, 361), (217, 128), (218, 181)), # more than 2x
((435, 361), (109, 64), (218, 181)), # almost 4x
((435, 361), (108, 64), (109, 91)), # more than 4x
((435, 361), (55, 32), (109, 91)), # almost 8x
((435, 361), (54, 32), (55, 46)), # more than 8x
((435, 361), (27, 16), (55, 46)), # more than 16x
# and vice versa
((435, 361), (128, 181), (435, 361)), # almost 2x
((435, 361), (128, 180), (218, 181)), # more than 2x
((435, 361), (64, 91), (218, 181)), # almost 4x
((435, 361), (64, 90), (109, 91)), # more than 4x
((435, 361), (32, 46), (109, 91)), # almost 8x
((435, 361), (32, 45), (55, 46)), # more than 8x
((435, 361), (16, 22), (55, 46)), # more than 16x
]:
im = draft_roundtrip("L", in_size, None, req_size)
im.load()
assert im.size == out_size
def test_mode():
for in_mode, req_mode, out_mode in [
("RGB", "1", "RGB"),
("RGB", "L", "L"),
("RGB", "RGB", "RGB"),
("RGB", "YCbCr", "YCbCr"),
("L", "1", "L"),
("L", "L", "L"),
("L", "RGB", "L"),
("L", "YCbCr", "L"),
("CMYK", "1", "CMYK"),
("CMYK", "L", "CMYK"),
("CMYK", "RGB", "CMYK"),
("CMYK", "YCbCr", "CMYK"),
]:
im = draft_roundtrip(in_mode, (64, 64), req_mode, None)
im.load()
assert im.mode == out_mode
def test_several_drafts():
im = draft_roundtrip("L", (128, 128), None, (64, 64))
im.draft(None, (64, 64))
im.load()
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