MobileRead Forums - View Single Post - Nonvnc and Opensource to Use DX(G) as a PC Display

knc1 · 09-15-2015, 08:23 AM

I happened to notice this snippet:

Code:

/*
 * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
 */

Since the e-ink devices are grayscale, you would probably get a much nicer display if you dithered 888 to 323 encoding rather than a simple truncate.

For inspiration:
Geekmaster posted some very fast dither code here (un-maintained).
And KOReader uses dither code.

Q?:
Does the DXG even have 8bpp frame buffer?
Or is it one of the Kindle 4bpp frame buffers, with tricky packing to 1 byte per pixel?

09-15-2015, 08:23 AM	#37
knc1 Going Viral Posts: 17,212 Karma: 18210809 Join Date: Feb 2012 Location: Central Texas Device: No K1, PW2, KV, KOA	I happened to notice this snippet: Code: /* * DisplayLink HW has separate 16bpp and 8bpp framebuffers. * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer */ Since the e-ink devices are grayscale, you would probably get a much nicer display if you dithered 888 to 323 encoding rather than a simple truncate. For inspiration: Geekmaster posted some very fast dither code here (un-maintained). And KOReader uses dither code. Q?: Does the DXG even have 8bpp frame buffer? Or is it one of the Kindle 4bpp frame buffers, with tricky packing to 1 byte per pixel?