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556 lines
19 KiB
Python
556 lines
19 KiB
Python
import pytest
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from PIL import Image, ImageSequence, PngImagePlugin
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# APNG browser support tests and fixtures via:
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# https://philip.html5.org/tests/apng/tests.html
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# (referenced from https://wiki.mozilla.org/APNG_Specification)
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def test_apng_basic():
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with Image.open("Tests/images/apng/single_frame.png") as im:
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assert not im.is_animated
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assert im.n_frames == 1
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assert im.get_format_mimetype() == "image/apng"
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assert im.info.get("default_image") is None
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/single_frame_default.png") as im:
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assert im.is_animated
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assert im.n_frames == 2
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assert im.get_format_mimetype() == "image/apng"
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assert im.info.get("default_image")
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assert im.getpixel((0, 0)) == (255, 0, 0, 255)
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assert im.getpixel((64, 32)) == (255, 0, 0, 255)
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im.seek(1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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# test out of bounds seek
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with pytest.raises(EOFError):
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im.seek(2)
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# test rewind support
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im.seek(0)
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assert im.getpixel((0, 0)) == (255, 0, 0, 255)
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assert im.getpixel((64, 32)) == (255, 0, 0, 255)
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im.seek(1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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def test_apng_fdat():
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with Image.open("Tests/images/apng/split_fdat.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/split_fdat_zero_chunk.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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def test_apng_dispose():
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with Image.open("Tests/images/apng/dispose_op_none.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/dispose_op_background.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 0, 0, 0)
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assert im.getpixel((64, 32)) == (0, 0, 0, 0)
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with Image.open("Tests/images/apng/dispose_op_background_final.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/dispose_op_previous.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/dispose_op_previous_final.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/dispose_op_previous_first.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 0, 0, 0)
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assert im.getpixel((64, 32)) == (0, 0, 0, 0)
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def test_apng_dispose_region():
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with Image.open("Tests/images/apng/dispose_op_none_region.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/dispose_op_background_before_region.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 0, 0, 0)
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assert im.getpixel((64, 32)) == (0, 0, 0, 0)
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with Image.open("Tests/images/apng/dispose_op_background_region.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 0, 255, 255)
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assert im.getpixel((64, 32)) == (0, 0, 0, 0)
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with Image.open("Tests/images/apng/dispose_op_previous_region.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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def test_apng_blend():
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with Image.open("Tests/images/apng/blend_op_source_solid.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/blend_op_source_transparent.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 0, 0, 0)
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assert im.getpixel((64, 32)) == (0, 0, 0, 0)
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with Image.open("Tests/images/apng/blend_op_source_near_transparent.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 2)
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assert im.getpixel((64, 32)) == (0, 255, 0, 2)
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with Image.open("Tests/images/apng/blend_op_over.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/blend_op_over_near_transparent.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 97)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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def test_apng_chunk_order():
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with Image.open("Tests/images/apng/fctl_actl.png") as im:
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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def test_apng_delay():
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with Image.open("Tests/images/apng/delay.png") as im:
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im.seek(1)
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assert im.info.get("duration") == 500.0
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im.seek(2)
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assert im.info.get("duration") == 1000.0
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im.seek(3)
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assert im.info.get("duration") == 500.0
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im.seek(4)
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assert im.info.get("duration") == 1000.0
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with Image.open("Tests/images/apng/delay_round.png") as im:
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im.seek(1)
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assert im.info.get("duration") == 500.0
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im.seek(2)
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assert im.info.get("duration") == 1000.0
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with Image.open("Tests/images/apng/delay_short_max.png") as im:
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im.seek(1)
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assert im.info.get("duration") == 500.0
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im.seek(2)
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assert im.info.get("duration") == 1000.0
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with Image.open("Tests/images/apng/delay_zero_denom.png") as im:
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im.seek(1)
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assert im.info.get("duration") == 500.0
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im.seek(2)
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assert im.info.get("duration") == 1000.0
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with Image.open("Tests/images/apng/delay_zero_numer.png") as im:
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im.seek(1)
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assert im.info.get("duration") == 0.0
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im.seek(2)
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assert im.info.get("duration") == 0.0
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im.seek(3)
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assert im.info.get("duration") == 500.0
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im.seek(4)
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assert im.info.get("duration") == 1000.0
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def test_apng_num_plays():
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with Image.open("Tests/images/apng/num_plays.png") as im:
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assert im.info.get("loop") == 0
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with Image.open("Tests/images/apng/num_plays_1.png") as im:
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assert im.info.get("loop") == 1
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def test_apng_mode():
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with Image.open("Tests/images/apng/mode_16bit.png") as im:
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assert im.mode == "RGBA"
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (0, 0, 128, 191)
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assert im.getpixel((64, 32)) == (0, 0, 128, 191)
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with Image.open("Tests/images/apng/mode_greyscale.png") as im:
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assert im.mode == "L"
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == 128
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assert im.getpixel((64, 32)) == 255
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with Image.open("Tests/images/apng/mode_greyscale_alpha.png") as im:
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assert im.mode == "LA"
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im.seek(im.n_frames - 1)
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assert im.getpixel((0, 0)) == (128, 191)
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assert im.getpixel((64, 32)) == (128, 191)
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with Image.open("Tests/images/apng/mode_palette.png") as im:
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assert im.mode == "P"
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im.seek(im.n_frames - 1)
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im = im.convert("RGB")
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assert im.getpixel((0, 0)) == (0, 255, 0)
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assert im.getpixel((64, 32)) == (0, 255, 0)
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with Image.open("Tests/images/apng/mode_palette_alpha.png") as im:
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assert im.mode == "P"
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im.seek(im.n_frames - 1)
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im = im.convert("RGBA")
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/mode_palette_1bit_alpha.png") as im:
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assert im.mode == "P"
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im.seek(im.n_frames - 1)
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im = im.convert("RGBA")
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assert im.getpixel((0, 0)) == (0, 0, 255, 128)
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assert im.getpixel((64, 32)) == (0, 0, 255, 128)
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def test_apng_chunk_errors():
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with Image.open("Tests/images/apng/chunk_no_actl.png") as im:
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assert not im.is_animated
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def open():
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with Image.open("Tests/images/apng/chunk_multi_actl.png") as im:
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im.load()
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assert not im.is_animated
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pytest.warns(UserWarning, open)
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with Image.open("Tests/images/apng/chunk_actl_after_idat.png") as im:
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assert not im.is_animated
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with Image.open("Tests/images/apng/chunk_no_fctl.png") as im:
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with pytest.raises(SyntaxError):
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im.seek(im.n_frames - 1)
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with Image.open("Tests/images/apng/chunk_repeat_fctl.png") as im:
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with pytest.raises(SyntaxError):
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im.seek(im.n_frames - 1)
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with Image.open("Tests/images/apng/chunk_no_fdat.png") as im:
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with pytest.raises(SyntaxError):
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im.seek(im.n_frames - 1)
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def test_apng_syntax_errors():
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def open_frames_zero():
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with Image.open("Tests/images/apng/syntax_num_frames_zero.png") as im:
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assert not im.is_animated
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with pytest.raises(OSError):
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im.load()
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pytest.warns(UserWarning, open_frames_zero)
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def open_frames_zero_default():
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with Image.open("Tests/images/apng/syntax_num_frames_zero_default.png") as im:
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assert not im.is_animated
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im.load()
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pytest.warns(UserWarning, open_frames_zero_default)
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# we can handle this case gracefully
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exception = None
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with Image.open("Tests/images/apng/syntax_num_frames_low.png") as im:
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try:
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im.seek(im.n_frames - 1)
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except Exception as e:
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exception = e
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assert exception is None
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with pytest.raises(SyntaxError):
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with Image.open("Tests/images/apng/syntax_num_frames_high.png") as im:
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im.seek(im.n_frames - 1)
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im.load()
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def open():
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with Image.open("Tests/images/apng/syntax_num_frames_invalid.png") as im:
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assert not im.is_animated
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im.load()
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pytest.warns(UserWarning, open)
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def test_apng_sequence_errors():
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test_files = [
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"sequence_start.png",
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"sequence_gap.png",
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"sequence_repeat.png",
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"sequence_repeat_chunk.png",
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"sequence_reorder.png",
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"sequence_reorder_chunk.png",
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"sequence_fdat_fctl.png",
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]
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for f in test_files:
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with pytest.raises(SyntaxError):
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with Image.open("Tests/images/apng/{0}".format(f)) as im:
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im.seek(im.n_frames - 1)
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im.load()
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def test_apng_save(tmp_path):
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with Image.open("Tests/images/apng/single_frame.png") as im:
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test_file = str(tmp_path / "temp.png")
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im.save(test_file, save_all=True)
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with Image.open(test_file) as im:
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im.load()
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assert not im.is_animated
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assert im.n_frames == 1
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assert im.get_format_mimetype() == "image/apng"
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assert im.info.get("default_image") is None
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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with Image.open("Tests/images/apng/single_frame_default.png") as im:
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frames = []
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for frame_im in ImageSequence.Iterator(im):
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frames.append(frame_im.copy())
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frames[0].save(
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test_file, save_all=True, default_image=True, append_images=frames[1:]
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)
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with Image.open(test_file) as im:
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im.load()
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assert im.is_animated
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assert im.n_frames == 2
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assert im.get_format_mimetype() == "image/apng"
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assert im.info.get("default_image")
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im.seek(1)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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def test_apng_save_split_fdat(tmp_path):
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# test to make sure we do not generate sequence errors when writing
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# frames with image data spanning multiple fdAT chunks (in this case
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# both the default image and first animation frame will span multiple
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# data chunks)
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test_file = str(tmp_path / "temp.png")
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with Image.open("Tests/images/old-style-jpeg-compression.png") as im:
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frames = [im.copy(), Image.new("RGBA", im.size, (255, 0, 0, 255))]
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im.save(
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test_file, save_all=True, default_image=True, append_images=frames,
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)
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with Image.open(test_file) as im:
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exception = None
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try:
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im.seek(im.n_frames - 1)
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im.load()
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except Exception as e:
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exception = e
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assert exception is None
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def test_apng_save_duration_loop(tmp_path):
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test_file = str(tmp_path / "temp.png")
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with Image.open("Tests/images/apng/delay.png") as im:
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frames = []
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durations = []
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loop = im.info.get("loop")
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default_image = im.info.get("default_image")
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for i, frame_im in enumerate(ImageSequence.Iterator(im)):
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frames.append(frame_im.copy())
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if i != 0 or not default_image:
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durations.append(frame_im.info.get("duration", 0))
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frames[0].save(
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test_file,
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save_all=True,
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default_image=default_image,
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append_images=frames[1:],
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duration=durations,
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loop=loop,
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)
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with Image.open(test_file) as im:
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im.load()
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assert im.info.get("loop") == loop
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im.seek(1)
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assert im.info.get("duration") == 500.0
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im.seek(2)
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assert im.info.get("duration") == 1000.0
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im.seek(3)
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assert im.info.get("duration") == 500.0
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im.seek(4)
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assert im.info.get("duration") == 1000.0
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# test removal of duplicated frames
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frame = Image.new("RGBA", (128, 64), (255, 0, 0, 255))
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frame.save(test_file, save_all=True, append_images=[frame], duration=[500, 250])
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with Image.open(test_file) as im:
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im.load()
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assert im.n_frames == 1
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assert im.info.get("duration") == 750
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def test_apng_save_disposal(tmp_path):
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test_file = str(tmp_path / "temp.png")
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size = (128, 64)
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red = Image.new("RGBA", size, (255, 0, 0, 255))
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green = Image.new("RGBA", size, (0, 255, 0, 255))
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transparent = Image.new("RGBA", size, (0, 0, 0, 0))
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# test APNG_DISPOSE_OP_NONE
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red.save(
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test_file,
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save_all=True,
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append_images=[green, transparent],
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disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
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blend=PngImagePlugin.APNG_BLEND_OP_OVER,
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)
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with Image.open(test_file) as im:
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im.seek(2)
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assert im.getpixel((0, 0)) == (0, 255, 0, 255)
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assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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# test APNG_DISPOSE_OP_BACKGROUND
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disposal = [
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PngImagePlugin.APNG_DISPOSE_OP_NONE,
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PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND,
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PngImagePlugin.APNG_DISPOSE_OP_NONE,
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]
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red.save(
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test_file,
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save_all=True,
|
|
append_images=[red, transparent],
|
|
disposal=disposal,
|
|
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(2)
|
|
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
|
|
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
|
|
|
|
disposal = [
|
|
PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND,
|
|
]
|
|
red.save(
|
|
test_file,
|
|
save_all=True,
|
|
append_images=[green],
|
|
disposal=disposal,
|
|
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(1)
|
|
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
|
|
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
|
|
|
|
# test APNG_DISPOSE_OP_PREVIOUS
|
|
disposal = [
|
|
PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
|
|
PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
]
|
|
red.save(
|
|
test_file,
|
|
save_all=True,
|
|
append_images=[green, red, transparent],
|
|
default_image=True,
|
|
disposal=disposal,
|
|
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(3)
|
|
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
|
|
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
|
|
|
|
disposal = [
|
|
PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
|
|
]
|
|
red.save(
|
|
test_file,
|
|
save_all=True,
|
|
append_images=[green],
|
|
disposal=disposal,
|
|
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(1)
|
|
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
|
|
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
|
|
|
|
|
|
def test_apng_save_blend(tmp_path):
|
|
test_file = str(tmp_path / "temp.png")
|
|
size = (128, 64)
|
|
red = Image.new("RGBA", size, (255, 0, 0, 255))
|
|
green = Image.new("RGBA", size, (0, 255, 0, 255))
|
|
transparent = Image.new("RGBA", size, (0, 0, 0, 0))
|
|
|
|
# test APNG_BLEND_OP_SOURCE on solid color
|
|
blend = [
|
|
PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
PngImagePlugin.APNG_BLEND_OP_SOURCE,
|
|
]
|
|
red.save(
|
|
test_file,
|
|
save_all=True,
|
|
append_images=[red, green],
|
|
default_image=True,
|
|
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
blend=blend,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(2)
|
|
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
|
|
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
|
|
|
|
# test APNG_BLEND_OP_SOURCE on transparent color
|
|
blend = [
|
|
PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
PngImagePlugin.APNG_BLEND_OP_SOURCE,
|
|
]
|
|
red.save(
|
|
test_file,
|
|
save_all=True,
|
|
append_images=[red, transparent],
|
|
default_image=True,
|
|
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
blend=blend,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(2)
|
|
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
|
|
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
|
|
|
|
# test APNG_BLEND_OP_OVER
|
|
red.save(
|
|
test_file,
|
|
save_all=True,
|
|
append_images=[green, transparent],
|
|
default_image=True,
|
|
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
|
|
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
|
|
)
|
|
with Image.open(test_file) as im:
|
|
im.seek(1)
|
|
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
|
|
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
|
|
im.seek(2)
|
|
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
|
|
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
|