pdfPrintSetQuality

Set the print quality.
void pdfPrintSetQuality(PDFHandle pdf, int quality)
This function sets the print quality: This setting is only relevant for GDI printing, i.e., for non-PostScript printers, or if pdfPrintForceGDI is in effect. It is ignored when XpdfPrint generates PostScript code.

pdfPrintResetParams resets this to its default value, which is to use the driver's default quality.

C:
pdfPrintSetQuality(pdf, 3);
pdfPrinterSupportsQuality
pdfPrintResetParams