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53 lines
1.3 KiB
53 lines
1.3 KiB
# frozen_string_literal: true
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module ImageUtils
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PNG_REGEXP = %r{\Aimage/(?:png|apng|vnd\.mozilla\.apng)\z}
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JPEG_REGEXP = %r{\Aimage/(?:jpeg|jpg|pjpeg)\z}
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ICO_REGEXP = %r{\Aimage/(?:x-icon|vnd\.microsoft\.icon)\z}
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BMP_REGEXP = %r{\Aimage/(?:bmp|x-bmp|x-ms-bmp)\z}
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UnsupportedFormat = Class.new(StandardError)
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module_function
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def load_vips(data, content_type: nil, autorot: false)
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content_type ||= Marcel::MimeType.for(data)
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image =
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case content_type
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when PNG_REGEXP
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Vips::Image.pngload_buffer(data)
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when JPEG_REGEXP
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Vips::Image.jpegload_buffer(data)
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when ICO_REGEXP
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LoadIco.call(data)
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when BMP_REGEXP
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LoadBmp.call(data)
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else
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raise UnsupportedFormat, content_type.to_s
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end
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autorot ? image.autorot : image
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end
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def blank?(image)
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stats = image.stats
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min = (0...image.bands).map { |i| stats.getpoint(0, i)[0] }
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max = (0...image.bands).map { |i| stats.getpoint(1, i)[0] }
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return true if min.all?(255) && max.all?(255)
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return true if min.all?(0) && max.all?(0)
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false
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end
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def error?(image)
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image = image.crop(0, 0, image.width / 4, 2)
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row1, row2 = image.to_a
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row1[3..] == row2[..-4] && row1.each_cons(2).none? { |a, b| a == b }
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end
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end
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