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Old 10-06-2012, 05:13 PM   #76
geekmaster
bit basher & pixel pusher
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Join Date: Nov 2011
Location: A young man living in an old man's body.
Device: Too many.
Quote:
Originally Posted by twobob View Post
...
Rather was banking on the 8bpp FB. now they have moved to 4Bpp again. well. phoeey. It puts all manner of nice things that bit further back again.
...
Where did you get this information? My paperwhite defaults to 8 bits-per-pixel:
Code:
[root@kindle root]# eips -i

Fixed framebuffer info
    id:              mxc_epdc_fb    smem_start:       0x75800000
    smem_len:            4718592    type:          PACKED_PIXELS
    type_aux:                  0    visual:   STATIC_PSEUDOCOLOR
    xpanstep:                  1    ypanstep:                  1
    ywrapstep:                 0    line_length:             768
    mmio_start:       0x00000000    mmio_len:                  0
    accel:                     0

Variable framebuffer info
    xres:                    758    yres:                   1024
    xres_virtual:            768    yres_virtual:           6144
    xoffset:                   0    yoffset:                   0
    bits_per_pixel:            8    grayscale:                 1
    red.offset:                0    green.offset:              0
    red.length:                8    green.length:              8
    red.msb_right:             0    green.msb_right:           0
    blue.offset:               0    transp.offset:             0
    blue.length:               8    transp.length:             0
    blue.msb_right:            0    transp.msb_right:          0
    nonstd:                    0    activate:                128
    width:                    -1    height:                   -1
    accel_flags:               0    pixclock:           40000000
    left_margin:              12    right_margin:             76
    upper_margin:              4    lower_margin:              5
    hsync_len:                12    vsync_len:                 2
    sync:                      0    vmode:                     0
    rotate:                    3
[root@kindle root]# 
So it is not that different after all. And the 8bpp is really just two copies of 4bpp. The "256 shades of gray" is done by dithering down to 4bpp and duplicating that into the upper half-byte.
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