SetaPDF_Core_Filter_Flate Class for handling zlib/deflate compression
File: /SetaPDF v2/Core/Filter/Flate.php
Whether or not to only write algorithm byte if predictor value is 15.
If set to true, the algorithm byte is written at the beginning of every line for all PNG predictors.
If set to false, this byte is only written for optimum png compression, which can vary the compression algorithm for each row.
Value prediction using the Alan W. Paeth algorithm.
- $left : int|float
The value to the left of the processed data entry.
- $above : int|float
The value above the processed data entry.
- $upperLeft : int|float
The value to the upper left of the processed data entry.
Returns the prediction value according to the Peath algorithm