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.
79 lines
2.1 KiB
Ruby
79 lines
2.1 KiB
Ruby
# A MediaFile for a JPEG, PNG, or GIF file. Uses libvips for resizing images.
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#
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# @see https://github.com/libvips/ruby-vips
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# @see https://libvips.github.io/libvips/API/current
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class MediaFile::Image < MediaFile
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# http://jcupitt.github.io/libvips/API/current/VipsForeignSave.html#vips-jpegsave
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JPEG_OPTIONS = { Q: 90, background: 255, strip: true, interlace: true, optimize_coding: true }
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# http://jcupitt.github.io/libvips/API/current/libvips-resample.html#vips-thumbnail
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THUMBNAIL_OPTIONS = { size: :down, linear: false }
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CROP_OPTIONS = { crop: :attention, linear: false }
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def dimensions
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image.size
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rescue Vips::Error
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[0, 0]
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end
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def is_corrupt?
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image.stats
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false
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rescue Vips::Error
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true
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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 channels
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image.bands
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end
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def colorspace
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image.interpretation
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end
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# @see https://github.com/jcupitt/libvips/wiki/HOWTO----Image-shrinking
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# @see http://jcupitt.github.io/libvips/API/current/Using-vipsthumbnail.md.html
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def preview(width, height)
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output_file = Tempfile.new(["image-preview", ".jpg"])
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resized_image = preview_frame.image.thumbnail_image(width, height: height, **THUMBNAIL_OPTIONS)
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resized_image.jpegsave(output_file.path, **JPEG_OPTIONS)
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MediaFile::Image.new(output_file)
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end
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def crop(width, height)
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output_file = Tempfile.new(["image-crop", ".jpg"])
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resized_image = preview_frame.image.thumbnail_image(width, height: height, **CROP_OPTIONS)
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resized_image.jpegsave(output_file.path, **JPEG_OPTIONS)
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MediaFile::Image.new(output_file)
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end
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def preview_frame
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if is_animated?
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FFmpeg.new(file).smart_video_preview
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else
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self
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end
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end
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def is_animated_gif?
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file_ext == :gif && image.get("n-pages") > 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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# @return [Vips::Image] the Vips image object for the file
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def image
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Vips::Image.new_from_file(file.path, fail: true).autorot
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end
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memoize :image, :dimensions, :is_corrupt?, :is_animated_gif?, :is_animated_png?
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end
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