RFC: bitmap line alignment

[Knut Petersen <Knut_Petersen@t-online.de>]

Hi everybody

I learned the hard way that image->width*image->height is not equal to the
number of bits consumed by the image bitmap. Every single line of bits is
aligned to a byte boundary.

Wouldn´t it be much more efficient to align every line to an u32 boundary?
Despite the obvious advantages of aligned cpu access to large arrays it
would also help to simplify the code for at least the cyberblade 
acceleration
engine.

The cyberblade always requires 32 bit quantities, so if the width of the 
image
is eg. 33, I have to feed _two_ u32 to it for every pixel line. Is the 
same true
for other acceleration engines?

I have not read the code of most of the framebuffer drivers, but I know 
that
a lot of them do not use accelerated imageblits. Those that do provide 
their own
functions would need to be adapted, as well as the cfb_imageblit 
function ...

Comments, please.

cu,
 Knut


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