Re: [Swftools-common] paletted-images and special swf-sizes?!

[Matthias Kramm]

On Tue, Feb 24, 2004 at 05:29:58PM +0100, Markus Schorer wrote:
> sometimes i get conversion errors (the line-offset of the pixel data
> seems to be shifted by 2 bytes).
> it does happen sometimes at the right border ( where width < 256).
> ...
> is there an known problem with "special-sized" images?

swf_SetBitsLossless() need each horizontal line of pixels to be aligned 
at a four-byte boundary.
In the case of level1.swf, the image is 182 pixels wide, so you need to pad 
each line
with two additional bytes (184%4==0).

There's also a macro, BYTES_PER_SCANLINE(x), which calculates the number
of bytes in the padded line.

So changing 

    doff += x+2;

to

    doff += BYTES_PER_SCANLINE(x);

should do the trick.


Greetings

Matthias