discourse/lib/image_sizer.rb

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module ImageSizer
# Resize an image to the aspect ratio we want
def self.resize(width, height, opts = {})
return if width.blank? || height.blank?
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max_width = (opts[:max_width] || SiteSetting.max_image_width).to_f
max_height = (opts[:max_height] || SiteSetting.max_image_height).to_f
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w = width.to_f
h = height.to_f
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return [w.floor, h.floor] if w <= max_width && h <= max_height
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ratio = [max_width / w, max_height / h].min
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[(w * ratio).floor, (h * ratio).floor]
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end
end