b378785582
Rotate the image based on the EXIF orientation flag when generating thumbnails and samples. Also fix the width and height to be calculated correctly for rotated images. Vips gives us the unrotated width and height of the image; we have to detect whether the image is rotated and swap the width and height manually to correct them. For example, if an image with the "Rotate 90 CW" flag is 100x500 before rotation, then after rotation it's 500x100. This should fix #4883 (Exif rotation breaks Javascript fit-to-window) We also have to fix it so that regenerating a post updates the width and height of the post, in the event that it's a rotated image. Finally we set `image-orientation: from-image;` even though it's probably not necessary.
96 lines
2.4 KiB
Ruby
96 lines
2.4 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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[width, height]
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rescue Vips::Error
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[0, 0]
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end
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def width
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is_rotated? ? image.height : image.width
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rescue Vips::Error
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0
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end
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def height
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is_rotated? ? image.width : image.height
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rescue Vips::Error
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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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# https://exiftool.org/TagNames/EXIF.html
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def is_rotated?
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metadata["IFD0:Orientation"].in?(["Rotate 90 CW", "Rotate 270 CW"])
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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)
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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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