(PECL pdflib >= 2.0.0)
Define blend
int PDF_shading ( resource $pdfdoc, string $shtype, float $x0, float $y0, float $x1, float $y1, float $c1, float $c2, float $c3, float $c4, string $optlist )
Defines a blend from the current fill color to another color.
This function requires PDF 1.4 or above.
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