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218 lines
7.1 KiB
Python
218 lines
7.1 KiB
Python
from __future__ import annotations
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from collections.abc import Generator
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from pathlib import Path
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import pytest
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from packaging.version import parse as parse_version
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from PIL import GifImagePlugin, Image, WebPImagePlugin, features
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from .helper import (
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assert_image_equal,
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assert_image_similar,
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is_big_endian,
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skip_unless_feature,
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)
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pytestmark = skip_unless_feature("webp")
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def test_n_frames() -> None:
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"""Ensure that WebP format sets n_frames and is_animated attributes correctly."""
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with Image.open("Tests/images/hopper.webp") as im:
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assert isinstance(im, WebPImagePlugin.WebPImageFile)
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assert im.n_frames == 1
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assert not im.is_animated
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with Image.open("Tests/images/iss634.webp") as im:
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assert isinstance(im, WebPImagePlugin.WebPImageFile)
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assert im.n_frames == 42
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assert im.is_animated
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def test_write_animation_L(tmp_path: Path) -> None:
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"""
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Convert an animated GIF to animated WebP, then compare the frame count, and first
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and last frames to ensure they're visually similar.
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"""
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with Image.open("Tests/images/iss634.gif") as orig:
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assert isinstance(orig, GifImagePlugin.GifImageFile)
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assert orig.n_frames > 1
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temp_file = tmp_path / "temp.webp"
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orig.save(temp_file, save_all=True)
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with Image.open(temp_file) as im:
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assert isinstance(im, WebPImagePlugin.WebPImageFile)
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assert im.n_frames == orig.n_frames
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# Compare first and last frames to the original animated GIF
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orig.load()
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im.load()
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assert_image_similar(im, orig.convert("RGBA"), 32.9)
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if is_big_endian():
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version = features.version_module("webp")
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assert version is not None
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if parse_version(version) < parse_version("1.2.2"):
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pytest.skip("Fails with libwebp earlier than 1.2.2")
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orig.seek(orig.n_frames - 1)
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im.seek(im.n_frames - 1)
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orig.load()
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im.load()
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assert_image_similar(im, orig.convert("RGBA"), 32.9)
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def test_write_animation_RGB(tmp_path: Path) -> None:
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"""
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Write an animated WebP from RGB frames, and ensure the frames
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are visually similar to the originals.
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"""
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def check(temp_file: Path) -> None:
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with Image.open(temp_file) as im:
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assert isinstance(im, WebPImagePlugin.WebPImageFile)
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assert im.n_frames == 2
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# Compare first frame to original
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im.load()
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assert_image_equal(im, frame1.convert("RGBA"))
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# Compare second frame to original
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if is_big_endian():
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version = features.version_module("webp")
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assert version is not None
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if parse_version(version) < parse_version("1.2.2"):
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pytest.skip("Fails with libwebp earlier than 1.2.2")
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im.seek(1)
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im.load()
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assert_image_equal(im, frame2.convert("RGBA"))
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with Image.open("Tests/images/anim_frame1.webp") as frame1:
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with Image.open("Tests/images/anim_frame2.webp") as frame2:
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temp_file1 = tmp_path / "temp.webp"
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frame1.copy().save(
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temp_file1, save_all=True, append_images=[frame2], lossless=True
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)
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check(temp_file1)
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# Tests appending using a generator
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def im_generator(
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ims: list[Image.Image],
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) -> Generator[Image.Image, None, None]:
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yield from ims
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temp_file2 = tmp_path / "temp_generator.webp"
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frame1.copy().save(
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temp_file2,
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save_all=True,
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append_images=im_generator([frame2]),
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lossless=True,
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)
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check(temp_file2)
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def test_timestamp_and_duration(tmp_path: Path) -> None:
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"""
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Try passing a list of durations, and make sure the encoded
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timestamps and durations are correct.
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"""
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durations = [0, 10, 20, 30, 40]
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temp_file = tmp_path / "temp.webp"
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with Image.open("Tests/images/anim_frame1.webp") as frame1:
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with Image.open("Tests/images/anim_frame2.webp") as frame2:
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frame1.save(
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temp_file,
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save_all=True,
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append_images=[frame2, frame1, frame2, frame1],
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duration=durations,
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)
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with Image.open(temp_file) as im:
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assert isinstance(im, WebPImagePlugin.WebPImageFile)
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assert im.n_frames == 5
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assert im.is_animated
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# Check that timestamps and durations match original values specified
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ts = 0
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for frame in range(im.n_frames):
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im.seek(frame)
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im.load()
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assert im.info["duration"] == durations[frame]
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assert im.info["timestamp"] == ts
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ts += durations[frame]
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def test_float_duration(tmp_path: Path) -> None:
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temp_file = tmp_path / "temp.webp"
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with Image.open("Tests/images/iss634.apng") as im:
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assert im.info["duration"] == 70.0
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im.save(temp_file, save_all=True)
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with Image.open(temp_file) as reloaded:
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reloaded.load()
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assert reloaded.info["duration"] == 70
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def test_seeking(tmp_path: Path) -> None:
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"""
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Create an animated WebP file, and then try seeking through frames in reverse-order,
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verifying the timestamps and durations are correct.
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"""
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dur = 33
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temp_file = tmp_path / "temp.webp"
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with Image.open("Tests/images/anim_frame1.webp") as frame1:
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with Image.open("Tests/images/anim_frame2.webp") as frame2:
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frame1.save(
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temp_file,
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save_all=True,
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append_images=[frame2, frame1, frame2, frame1],
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duration=dur,
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)
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with Image.open(temp_file) as im:
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assert isinstance(im, WebPImagePlugin.WebPImageFile)
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assert im.n_frames == 5
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assert im.is_animated
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# Traverse frames in reverse, checking timestamps and durations
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ts = dur * (im.n_frames - 1)
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for frame in reversed(range(im.n_frames)):
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im.seek(frame)
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im.load()
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assert im.info["duration"] == dur
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assert im.info["timestamp"] == ts
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ts -= dur
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def test_seek_errors() -> None:
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with Image.open("Tests/images/iss634.webp") as im:
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with pytest.raises(EOFError):
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im.seek(-1)
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with pytest.raises(EOFError):
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im.seek(42)
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def test_alpha_quality(tmp_path: Path) -> None:
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with Image.open("Tests/images/transparent.png") as im:
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first_frame = Image.new("L", im.size)
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out = tmp_path / "temp.webp"
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first_frame.save(out, save_all=True, append_images=[im])
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out_quality = tmp_path / "quality.webp"
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first_frame.save(
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out_quality, save_all=True, append_images=[im], alpha_quality=50
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)
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with Image.open(out) as reloaded:
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reloaded.seek(1)
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with Image.open(out_quality) as reloaded_quality:
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reloaded_quality.seek(1)
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assert reloaded.tobytes() != reloaded_quality.tobytes()
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