Re: Re: bits_per_pixel query

On Mon, 09 Sep 2002 Antonino Daplas wrote :

Just pad the pitch/line_length/stride of the buffer to the next byte
alignment your hardware is capable of.  It is acceptable to have excess
bits/bytes which theoretically your hardware will ignore.

The padding is at the end of the line_length, or
at the end of the pixel data? I tried both ways,
but I'm getting a skewed square, which I draw
using a user space application.

For static pseudocolor and truecolor, that is true, since 0 is hardwired
to black.  For pseudocolor and directcolor, that depends on how the
DAC/palette is loaded. In most cases, it will produce a black screen.

For psuedocolor and direct color, does the pixel
data, have the index into the colormap or does it
have actual colors? If it has the index, then the size of the buffer would be lesser: right?

Thanks,

- navin.

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