Re: fb_imageblit semantic

On 17 Mar 03 at 13:18, Geert Uytterhoeven wrote:

That depends... How do we draw the monochrome penguin? Using image->depth is 1
or 8? The latter (current method) is slower, since we need to expand the
monochrome logo to 8-bit first, and (usually) compress it to 1-bit in the fbdev
driver afterwards.

As far as I can see, it gets monochromatic logo and converts it to
8bpp format ;-) (fb_set_logo, needs_logo = 1 or ~1) And then imageblit
converts it back to 1bpp.
 

And perhaps we may want to draw 32-bit ARGB images later?

So I see the following possible valid values for image->depth:
  - 8 (logo with up to 256 colors and LUT)
  - optional 1 (monochrome logo, if we don't want to expand?)
  - optional 32 (ARGB image, dithering left to the driver?)

I still do not understand 'if we don't want to expand'. This forces too
much knowledge on upper layer, as far as I can tell.
                                                    Petr Vandrovec
                                                    



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