ZDesigner: Investigate ability to set dithering

[tresf]

Winspool's DEVMODE offers a dithering option called dmDitherType. Possible values are:

/* Dither types */
#define DMDITHER_NONE           1      /* No dithering */
#define DMDITHER_COARSE         2      /* Dither with a coarse brush */
#define DMDITHER_FINE           3      /* Dither with a fine brush */
#define DMDITHER_LINEART        4      /* LineArt dithering */
#define DMDITHER_ERRORDIFFUSION 5      /* LineArt dithering */
#define DMDITHER_RESERVED6      6      /* LineArt dithering */
#define DMDITHER_RESERVED7      7      /* LineArt dithering */
#define DMDITHER_RESERVED8      8      /* LineArt dithering */
#define DMDITHER_RESERVED9      9      /* LineArt dithering */
#define DMDITHER_GRAYSCALE      10     /* Device does grayscaling */

Header file: WinGDI.h.

I'm curious if the ZDesigner driver utilizes these properties and -- if so -- can we manipulate them at print time?

Possible blocker: java-native-access/jna#1429

[Vzor-]

https://learn.microsoft.com/en-us/troubleshoot/windows/win32/modify-printer-settings-documentproperties

It looks involved but we should be able to do it. This would be changing the setting of the printer, for all prints. Is that something we want? or would we do something like set this value, then unset it.

[tresf]

It looks involved but we should be able to do it. This would be changing the setting of the printer, for all prints. Is that something we want? or would we do something like set this value, then unset it.

Let's make all settings temporary, but provide a persistent flag to lock it in.