import pytest from PIL import Image, ImageSequence, PngImagePlugin # APNG browser support tests and fixtures via: # https://philip.html5.org/tests/apng/tests.html # (referenced from https://wiki.mozilla.org/APNG_Specification) def test_apng_basic(): with Image.open("Tests/images/apng/single_frame.png") as im: assert not im.is_animated assert im.n_frames == 1 assert im.get_format_mimetype() == "image/apng" assert im.info.get("default_image") is None assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/single_frame_default.png") as im: assert im.is_animated assert im.n_frames == 2 assert im.get_format_mimetype() == "image/apng" assert im.info.get("default_image") assert im.getpixel((0, 0)) == (255, 0, 0, 255) assert im.getpixel((64, 32)) == (255, 0, 0, 255) im.seek(1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) # test out of bounds seek with pytest.raises(EOFError): im.seek(2) # test rewind support im.seek(0) assert im.getpixel((0, 0)) == (255, 0, 0, 255) assert im.getpixel((64, 32)) == (255, 0, 0, 255) im.seek(1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) def test_apng_fdat(): with Image.open("Tests/images/apng/split_fdat.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/split_fdat_zero_chunk.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) def test_apng_dispose(): with Image.open("Tests/images/apng/dispose_op_none.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/dispose_op_background.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 0, 0, 0) assert im.getpixel((64, 32)) == (0, 0, 0, 0) with Image.open("Tests/images/apng/dispose_op_background_final.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/dispose_op_previous.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/dispose_op_previous_final.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/dispose_op_previous_first.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 0, 0, 0) assert im.getpixel((64, 32)) == (0, 0, 0, 0) def test_apng_dispose_region(): with Image.open("Tests/images/apng/dispose_op_none_region.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/dispose_op_background_before_region.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 0, 0, 0) assert im.getpixel((64, 32)) == (0, 0, 0, 0) with Image.open("Tests/images/apng/dispose_op_background_region.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 0, 255, 255) assert im.getpixel((64, 32)) == (0, 0, 0, 0) with Image.open("Tests/images/apng/dispose_op_previous_region.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) def test_apng_dispose_op_previous_frame(): # Test that the dispose settings being used are from the previous frame # # Image created with: # red = Image.new("RGBA", (128, 64), (255, 0, 0, 255)) # green = red.copy() # green.paste(Image.new("RGBA", (64, 32), (0, 255, 0, 255))) # blue = red.copy() # blue.paste(Image.new("RGBA", (64, 32), (0, 255, 0, 255)), (64, 32)) # # red.save( # "Tests/images/apng/dispose_op_previous_frame.png", # save_all=True, # append_images=[green, blue], # disposal=[ # PngImagePlugin.Disposal.OP_NONE, # PngImagePlugin.Disposal.OP_PREVIOUS, # PngImagePlugin.Disposal.OP_PREVIOUS # ], # ) with Image.open("Tests/images/apng/dispose_op_previous_frame.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (255, 0, 0, 255) def test_apng_dispose_op_background_p_mode(): with Image.open("Tests/images/apng/dispose_op_background_p_mode.png") as im: im.seek(1) im.load() assert im.size == (128, 64) def test_apng_blend(): with Image.open("Tests/images/apng/blend_op_source_solid.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/blend_op_source_transparent.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 0, 0, 0) assert im.getpixel((64, 32)) == (0, 0, 0, 0) with Image.open("Tests/images/apng/blend_op_source_near_transparent.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 2) assert im.getpixel((64, 32)) == (0, 255, 0, 2) with Image.open("Tests/images/apng/blend_op_over.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/blend_op_over_near_transparent.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 97) assert im.getpixel((64, 32)) == (0, 255, 0, 255) def test_apng_chunk_order(): with Image.open("Tests/images/apng/fctl_actl.png") as im: im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) def test_apng_delay(): with Image.open("Tests/images/apng/delay.png") as im: im.seek(1) assert im.info.get("duration") == 500.0 im.seek(2) assert im.info.get("duration") == 1000.0 im.seek(3) assert im.info.get("duration") == 500.0 im.seek(4) assert im.info.get("duration") == 1000.0 with Image.open("Tests/images/apng/delay_round.png") as im: im.seek(1) assert im.info.get("duration") == 500.0 im.seek(2) assert im.info.get("duration") == 1000.0 with Image.open("Tests/images/apng/delay_short_max.png") as im: im.seek(1) assert im.info.get("duration") == 500.0 im.seek(2) assert im.info.get("duration") == 1000.0 with Image.open("Tests/images/apng/delay_zero_denom.png") as im: im.seek(1) assert im.info.get("duration") == 500.0 im.seek(2) assert im.info.get("duration") == 1000.0 with Image.open("Tests/images/apng/delay_zero_numer.png") as im: im.seek(1) assert im.info.get("duration") == 0.0 im.seek(2) assert im.info.get("duration") == 0.0 im.seek(3) assert im.info.get("duration") == 500.0 im.seek(4) assert im.info.get("duration") == 1000.0 def test_apng_num_plays(): with Image.open("Tests/images/apng/num_plays.png") as im: assert im.info.get("loop") == 0 with Image.open("Tests/images/apng/num_plays_1.png") as im: assert im.info.get("loop") == 1 def test_apng_mode(): with Image.open("Tests/images/apng/mode_16bit.png") as im: assert im.mode == "RGBA" im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (0, 0, 128, 191) assert im.getpixel((64, 32)) == (0, 0, 128, 191) with Image.open("Tests/images/apng/mode_greyscale.png") as im: assert im.mode == "L" im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == 128 assert im.getpixel((64, 32)) == 255 with Image.open("Tests/images/apng/mode_greyscale_alpha.png") as im: assert im.mode == "LA" im.seek(im.n_frames - 1) assert im.getpixel((0, 0)) == (128, 191) assert im.getpixel((64, 32)) == (128, 191) with Image.open("Tests/images/apng/mode_palette.png") as im: assert im.mode == "P" im.seek(im.n_frames - 1) im = im.convert("RGB") assert im.getpixel((0, 0)) == (0, 255, 0) assert im.getpixel((64, 32)) == (0, 255, 0) with Image.open("Tests/images/apng/mode_palette_alpha.png") as im: assert im.mode == "P" im.seek(im.n_frames - 1) im = im.convert("RGBA") assert im.getpixel((0, 0)) == (255, 0, 0, 0) assert im.getpixel((64, 32)) == (255, 0, 0, 0) with Image.open("Tests/images/apng/mode_palette_1bit_alpha.png") as im: assert im.mode == "P" im.seek(im.n_frames - 1) im = im.convert("RGBA") assert im.getpixel((0, 0)) == (0, 0, 255, 128) assert im.getpixel((64, 32)) == (0, 0, 255, 128) def test_apng_chunk_errors(): with Image.open("Tests/images/apng/chunk_no_actl.png") as im: assert not im.is_animated def open(): with Image.open("Tests/images/apng/chunk_multi_actl.png") as im: im.load() assert not im.is_animated pytest.warns(UserWarning, open) with Image.open("Tests/images/apng/chunk_actl_after_idat.png") as im: assert not im.is_animated with Image.open("Tests/images/apng/chunk_no_fctl.png") as im: with pytest.raises(SyntaxError): im.seek(im.n_frames - 1) with Image.open("Tests/images/apng/chunk_repeat_fctl.png") as im: with pytest.raises(SyntaxError): im.seek(im.n_frames - 1) with Image.open("Tests/images/apng/chunk_no_fdat.png") as im: with pytest.raises(SyntaxError): im.seek(im.n_frames - 1) def test_apng_syntax_errors(): def open_frames_zero(): with Image.open("Tests/images/apng/syntax_num_frames_zero.png") as im: assert not im.is_animated with pytest.raises(OSError): im.load() pytest.warns(UserWarning, open_frames_zero) def open_frames_zero_default(): with Image.open("Tests/images/apng/syntax_num_frames_zero_default.png") as im: assert not im.is_animated im.load() pytest.warns(UserWarning, open_frames_zero_default) # we can handle this case gracefully exception = None with Image.open("Tests/images/apng/syntax_num_frames_low.png") as im: try: im.seek(im.n_frames - 1) except Exception as e: exception = e assert exception is None with pytest.raises(OSError): with Image.open("Tests/images/apng/syntax_num_frames_high.png") as im: im.seek(im.n_frames - 1) im.load() def open(): with Image.open("Tests/images/apng/syntax_num_frames_invalid.png") as im: assert not im.is_animated im.load() pytest.warns(UserWarning, open) @pytest.mark.parametrize( "test_file", ( "sequence_start.png", "sequence_gap.png", "sequence_repeat.png", "sequence_repeat_chunk.png", "sequence_reorder.png", "sequence_reorder_chunk.png", "sequence_fdat_fctl.png", ), ) def test_apng_sequence_errors(test_file): with pytest.raises(SyntaxError): with Image.open(f"Tests/images/apng/{test_file}") as im: im.seek(im.n_frames - 1) im.load() def test_apng_save(tmp_path): with Image.open("Tests/images/apng/single_frame.png") as im: test_file = str(tmp_path / "temp.png") im.save(test_file, save_all=True) with Image.open(test_file) as im: im.load() assert not im.is_animated assert im.n_frames == 1 assert im.get_format_mimetype() == "image/apng" assert im.info.get("default_image") is None assert im.getpixel((0, 0)) == (0, 255, 0, 255) assert im.getpixel((64, 32)) == (0, 255, 0, 255) with Image.open("Tests/images/apng/single_frame_default.png") as im: frames = [] for frame_im in ImageSequence.Iterator(im): frames.append(frame_im.copy()) frames[0].save( test_file, save_all=True, default_image=True, append_images=frames[1:] ) with Image.open(test_file) as im: im.load() assert im.is_animated assert im.n_frames == 2 assert im.get_format_mimetype() == "image/apng" assert im.info.get("default_image") 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_split_fdat(tmp_path): # test to make sure we do not generate sequence errors when writing # frames with image data spanning multiple fdAT chunks (in this case # both the default image and first animation frame will span multiple # data chunks) test_file = str(tmp_path / "temp.png") with Image.open("Tests/images/old-style-jpeg-compression.png") as im: frames = [im.copy(), Image.new("RGBA", im.size, (255, 0, 0, 255))] im.save( test_file, save_all=True, default_image=True, append_images=frames, ) with Image.open(test_file) as im: exception = None try: im.seek(im.n_frames - 1) im.load() except Exception as e: exception = e assert exception is None def test_apng_save_duration_loop(tmp_path): test_file = str(tmp_path / "temp.png") with Image.open("Tests/images/apng/delay.png") as im: frames = [] durations = [] loop = im.info.get("loop") default_image = im.info.get("default_image") for i, frame_im in enumerate(ImageSequence.Iterator(im)): frames.append(frame_im.copy()) if i != 0 or not default_image: durations.append(frame_im.info.get("duration", 0)) frames[0].save( test_file, save_all=True, default_image=default_image, append_images=frames[1:], duration=durations, loop=loop, ) with Image.open(test_file) as im: im.load() assert im.info.get("loop") == loop im.seek(1) assert im.info.get("duration") == 500.0 im.seek(2) assert im.info.get("duration") == 1000.0 im.seek(3) assert im.info.get("duration") == 500.0 im.seek(4) assert im.info.get("duration") == 1000.0 # test removal of duplicated frames frame = Image.new("RGBA", (128, 64), (255, 0, 0, 255)) frame.save( test_file, save_all=True, append_images=[frame, frame], duration=[500, 100, 150] ) with Image.open(test_file) as im: im.load() assert im.n_frames == 1 assert im.info.get("duration") == 750 # test info duration frame.info["duration"] = 750 frame.save(test_file, save_all=True) with Image.open(test_file) as im: assert im.info.get("duration") == 750 def test_apng_save_disposal(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 OP_NONE red.save( test_file, save_all=True, append_images=[green, transparent], disposal=PngImagePlugin.Disposal.OP_NONE, blend=PngImagePlugin.Blend.OP_OVER, ) 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 OP_BACKGROUND disposal = [ PngImagePlugin.Disposal.OP_NONE, PngImagePlugin.Disposal.OP_BACKGROUND, PngImagePlugin.Disposal.OP_NONE, ] red.save( test_file, save_all=True, append_images=[red, transparent], disposal=disposal, blend=PngImagePlugin.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.Disposal.OP_NONE, PngImagePlugin.Disposal.OP_BACKGROUND, ] red.save( test_file, save_all=True, append_images=[green], disposal=disposal, blend=PngImagePlugin.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 OP_PREVIOUS disposal = [ PngImagePlugin.Disposal.OP_NONE, PngImagePlugin.Disposal.OP_PREVIOUS, PngImagePlugin.Disposal.OP_NONE, ] red.save( test_file, save_all=True, append_images=[green, red, transparent], default_image=True, disposal=disposal, blend=PngImagePlugin.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.Disposal.OP_NONE, PngImagePlugin.Disposal.OP_PREVIOUS, ] red.save( test_file, save_all=True, append_images=[green], disposal=disposal, blend=PngImagePlugin.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 info disposal red.info["disposal"] = PngImagePlugin.Disposal.OP_BACKGROUND red.save( test_file, save_all=True, append_images=[Image.new("RGBA", (10, 10), (0, 255, 0, 255))], ) with Image.open(test_file) as im: im.seek(1) assert im.getpixel((64, 32)) == (0, 0, 0, 0) def test_apng_save_disposal_previous(tmp_path): test_file = str(tmp_path / "temp.png") size = (128, 64) transparent = Image.new("RGBA", size, (0, 0, 0, 0)) red = Image.new("RGBA", size, (255, 0, 0, 255)) green = Image.new("RGBA", size, (0, 255, 0, 255)) # test OP_NONE transparent.save( test_file, save_all=True, append_images=[red, green], disposal=PngImagePlugin.Disposal.OP_PREVIOUS, ) 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) 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 OP_SOURCE on solid color blend = [ PngImagePlugin.Blend.OP_OVER, PngImagePlugin.Blend.OP_SOURCE, ] red.save( test_file, save_all=True, append_images=[red, green], default_image=True, disposal=PngImagePlugin.Disposal.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 OP_SOURCE on transparent color blend = [ PngImagePlugin.Blend.OP_OVER, PngImagePlugin.Blend.OP_SOURCE, ] red.save( test_file, save_all=True, append_images=[red, transparent], default_image=True, disposal=PngImagePlugin.Disposal.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 OP_OVER red.save( test_file, save_all=True, append_images=[green, transparent], default_image=True, disposal=PngImagePlugin.Disposal.OP_NONE, blend=PngImagePlugin.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) # test info blend red.info["blend"] = PngImagePlugin.Blend.OP_OVER red.save(test_file, save_all=True, append_images=[green, transparent]) with Image.open(test_file) as im: im.seek(2) assert im.getpixel((0, 0)) == (0, 255, 0, 255) def test_seek_after_close(): im = Image.open("Tests/images/apng/delay.png") im.seek(1) im.close() with pytest.raises(ValueError): im.seek(0) def test_constants_deprecation(): for enum, prefix in { PngImagePlugin.Disposal: "APNG_DISPOSE_", PngImagePlugin.Blend: "APNG_BLEND_", }.items(): for name in enum.__members__: with pytest.warns(DeprecationWarning): assert getattr(PngImagePlugin, prefix + name) == enum[name]