Methods to import a canvas from a PNG data URL.
Imports a canvas from a PNG data URL. @param [String] string The data URL string to load from. @return [Canvas] The imported canvas. @raise ChunkyPNG::SignatureMismatch if the provides string is not a properly
formatted PNG data URL (i.e. it should start with "data:image/png;base64,")
# File lib/chunky_png/canvas/data_url_importing.rb, line 12 def from_data_url(string) if string =~ %[^data:image/png;base64,((?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=))$] from_blob($1.unpack('m').first) else raise SignatureMismatch, "The string was not a properly formatted data URL for a PNG image." end end
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