what i wanted most was anti-aliased fonts (they're gorgeous with this hack!).
anti-aliasing needs A8 pixel format.
i created a surface:
einkdsc.flags
= DSDESC_CAPS|DSDESC_WIDTH|DSDESC_HEIGHT
|DSDESC_PIXELFORMAT|DSDESC_PREALLOCATED;
einkdsc.caps = 0;
einkdsc.width = 600;
einkdsc.height = 800;
einkdsc.pixelformat = DSPF_A8;
einkdsc.preallocated[0].data = screenbuffer;
einkdsc.preallocated[0].pitch = 600;
einkdsc.preallocated[1].data = screenbuffer;
einkdsc.preallocated[1].pitch = 600;
dfb->CreateSurface(dfb,&einkdsc,&eink);
then mmap()ed the framebuffer:
framebuffer
= mmap(NULL,(800 * 600) / 2,PROT_READ|PROT_WRITE,MAP_SHARED,fb,0);
and i blit between the two:
void fbblit(char* dst,char* src)
{
unsigned aa;
aa = 0;
for(;
{
dst[aa] = ((src[aa * 2] & 0xf) << 4) | (src[1 + (aa * 2)] & 0xf);
dst[aa] ^= 0xff;
++aa;
if(((600 * 800) / 2) == aa) break;
}
}