Object
A convenience class that wraps the logic for extracting the parts of a JPG image that we need to embed them in a PDF
Process a new JPG image
:data | A binary string of JPEG data |
# File lib/prawn/images/jpg.rb, line 27 27: def initialize(data) 28: data = StringIO.new(data.dup) 29: 30: c_marker = "\xff" # Section marker. 31: data.read(2) # Skip the first two bytes of JPEG identifier. 32: loop do 33: marker, code, length = data.read(4).unpack('aan') 34: raise "JPEG marker not found!" if marker != c_marker 35: 36: if JPEG_SOF_BLOCKS.include?(code) 37: @bits, @height, @width, @channels = data.read(6).unpack("CnnC") 38: break 39: end 40: 41: buffer = data.read(length - 2) 42: end 43: end
Disabled; run with --debug to generate this.
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