45064853de
* Move image thumbnail generation code to MediaFile::Image. * Move video thumbnail generation code to MediaFile::Video. * Move ugoira->webm conversion code to MediaFile::Ugoira. This separates thumbnail generation from the upload process so that it's possible to generate thumbnails outside of uploads.
47 lines
1.9 KiB
Ruby
47 lines
1.9 KiB
Ruby
class MediaFile::Image < MediaFile
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# Taken from ArgyllCMS 2.0.0 (see also: https://ninedegreesbelow.com/photography/srgb-profile-comparison.html)
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SRGB_PROFILE = "#{Rails.root}/config/sRGB.icm"
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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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if Vips.at_least_libvips?(8, 8)
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THUMBNAIL_OPTIONS = { size: :down, linear: false, no_rotate: true, export_profile: SRGB_PROFILE, import_profile: SRGB_PROFILE }
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CROP_OPTIONS = { crop: :attention, linear: false, no_rotate: true, export_profile: SRGB_PROFILE, import_profile: SRGB_PROFILE }
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else
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THUMBNAIL_OPTIONS = { size: :down, linear: false, auto_rotate: false, export_profile: SRGB_PROFILE, import_profile: SRGB_PROFILE }
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CROP_OPTIONS = { crop: :attention, linear: false, auto_rotate: false, export_profile: SRGB_PROFILE, import_profile: SRGB_PROFILE }
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end
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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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# https://github.com/jcupitt/libvips/wiki/HOWTO----Image-shrinking
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# 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 = 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 = 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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private
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def image
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@image ||= Vips::Image.new_from_file(file.path, fail: true)
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end
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end
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