74b03a7bd0
Fix a bug where where PNG images could be incorrectly detected as exif-rotated. This would happen when a PNG contained the IFD0:Orientation flag. It's technically possible for a PNG to contain this flag, but it's ignored by libvips and by browsers. post #3762340 (nsfw) is an example of a PNG like this. The fix is to use `autorot` to let libvips apply the rotation instead of trying to interpret the exif data ourselves. Note that libvips-8.9 has a bug where it doesn't strip the orientation flag after applying `autorot`, which leads to the image being incorrectly rotated a second time when generating the thumbnail. Use libvips-8.11 instead.
77 lines
2.8 KiB
Ruby
77 lines
2.8 KiB
Ruby
class MediaAsset < ApplicationRecord
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has_one :media_metadata, dependent: :destroy
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delegate :metadata, to: :media_metadata
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def self.search(params)
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q = search_attributes(params, :id, :created_at, :updated_at, :md5, :file_ext, :file_size, :image_width, :image_height)
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q = q.apply_default_order(params)
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q
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end
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def file=(file_or_path)
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media_file = file_or_path.is_a?(MediaFile) ? file_or_path : MediaFile.open(file_or_path)
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self.md5 = media_file.md5
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self.file_ext = media_file.file_ext
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self.file_size = media_file.file_size
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self.image_width = media_file.width
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self.image_height = media_file.height
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self.media_metadata = MediaMetadata.new(file: media_file)
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end
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def is_animated?
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is_animated_gif? || is_animated_png?
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end
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def is_animated_gif?
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file_ext == "gif" && metadata.fetch("GIF:FrameCount", 1) > 1
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end
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def is_animated_png?
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file_ext == "png" && metadata.fetch("PNG:AnimationFrames", 1) > 1
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end
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# @see https://exiftool.org/TagNames/JPEG.html
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# @see https://exiftool.org/TagNames/PNG.html
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# @see https://danbooru.donmai.us/posts?tags=exif:File:ColorComponents=1
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# @see https://danbooru.donmai.us/posts?tags=exif:PNG:ColorType=Grayscale
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def is_greyscale?
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metadata["File:ColorComponents"] == 1 ||
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metadata["PNG:ColorType"] == "Grayscale" ||
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metadata["PNG:ColorType"] == "Grayscale with Alpha"
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# Not always accurate:
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# metadata["ICC-header:ColorSpaceData"] == "GRAY" ||
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# metadata["XMP-photoshop:ColorMode"] == "Grayscale" ||
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# metadata["XMP-photoshop:ICCProfileName"] == "EPSON Gray - Gamma 2.2" ||
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# metadata["XMP-photoshop:ICCProfileName"] == "Gray Gamma 2.2"
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end
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# https://exiftool.org/TagNames/EXIF.html
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def is_rotated?
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file_ext == "jpg" && metadata["IFD0:Orientation"].in?(["Rotate 90 CW", "Rotate 270 CW", "Rotate 180"])
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end
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# Some animations technically have a finite loop count, but loop for hundreds
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# or thousands of times. Only count animations with a low loop count as non-repeating.
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def is_non_repeating_animation?
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loop_count.in?(0..10)
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end
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# @see https://exiftool.org/TagNames/GIF.html
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# @see https://exiftool.org/TagNames/PNG.html
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# @see https://danbooru.donmai.us/posts?tags=-exif:GIF:AnimationIterations=Infinite+animated_gif
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# @see https://danbooru.donmai.us/posts?tags=-exif:PNG:AnimationPlays=inf+animated_png
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def loop_count
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return Float::INFINITY if metadata["GIF:AnimationIterations"] == "Infinite"
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return Float::INFINITY if metadata["PNG:AnimationPlays"] == "inf"
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return metadata["GIF:AnimationIterations"] if metadata["GIF:AnimationIterations"].present?
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return metadata["PNG:AnimationPlays"] if metadata["PNG:AnimationPlays"].present?
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# If the AnimationIterations tag isn't present, then it's counted as a loop count of 0.
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return 0 if is_animated_gif? && metadata["GIF:AnimationIterations"].nil?
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nil
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end
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end
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