setasign\SetaPDF2\Core\Filter
Brotli Class for handling Brotli compressed data
File: /SetaPDF v2/Core/Filter/Brotli.php
Class hierarchy
Implements
Summary
Properties
$alwaysWritePredictorByte
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.
Methods
__construct()
public Predictor::__construct (
int $predictor = null,
int $colors = null,
int $bitsPerComponent = null,
int $columns = null
)int $colors = null,
int $bitsPerComponent = null,
int $columns = null
The constructor.
Parameters
- $predictor : int
- $colors : int
- $bitsPerComponent : int
- $columns : int
_decodePng()
_paethPredictor()
protected Predictor::_paethPredictor (
int|float $left,
int|float $above,
int|float $upperLeft
): int|floatint|float $above,
int|float $upperLeft
Value prediction using the Alan W. Paeth algorithm.
Parameters
- $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.
Return Values
Returns the prediction value according to the Peath algorithm