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Improve tiff stream decoding performance #360

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merged 1 commit into from Sep 4, 2021
Merged

Improve tiff stream decoding performance #360

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6 changes: 3 additions & 3 deletions lib/pdf/reader/filter/depredict.rb
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Expand Up @@ -34,7 +34,7 @@ def filter(data)
################################################################################
def tiff_depredict(data)
data = data.unpack("C*")
unfiltered = []
unfiltered = ''
bpc = @options[:BitsPerComponent] || 8
pixel_bits = bpc * @options[:Colors]
pixel_bytes = pixel_bits / 8
Expand All @@ -51,11 +51,11 @@ def tiff_depredict(data)
left = index < pixel_bytes ? 0 : row_data[index - pixel_bytes]
row_data[index] = (byte + left) % 256
end
unfiltered += row_data
unfiltered += row_data.pack("C*")
pos += line_len
end

unfiltered.pack("C*")
unfiltered
end
################################################################################
def png_depredict(data)
Expand Down