LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
January 2010
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2010.01.11 09:47 "Re: me again...", by Gerben Vos
Kavallieratou Ergina wrote:
> struct gen
> {
> unsigned char ** data;
> unsigned short int width;
> unsigned short int height;
> unsigned short int bits_per_pixel;
> };
> bits= imagen->data[y*imagen->width];
Actually, maybe it should really still be:
bits= imagen->data[y];
Or maybe it should be (note the '&'):
bits= &imagen->data[y*imagen->width];
It all depends what kind of data imagen->data points to EXACTLY.
Does data point directly to the pixels? Then you should have declared
it as BYTE *, not BYTE **, and you should multiply by the size of the
scanline in bytes (note that in Windows BMPs, that size is rounded up to
a multiple of 4 bytes, but in TIFF to a single byte). Or does it point
to an array of pointers, which each then points to the data of a
scanline? In that case, the multiplication already happened when
you initialized that extra array, so you don't need to do it here.
Gerben.