On Thu, 01 Jun 2006 22:41:35 PDT, heavenscape said:
> //create a GdkPixbuf
> GdkPixbuf* pb = gdk_pixbuf_new_from_data( pDisplayBuf, // data buffer
> GDK_COLORSPACE_RGB, //COLORSPACE
> FALSE, // has_alpha,
> 8, // int bits_per_sample,
> 2048, // int width,
> 2048, // int height,
> 2048*3, // sizeX*3; //int rowstride,
> NULL, //GdkPixbufDestroyNotify destroy_fn,
> NULL //gpointer destroy_fn_data);
> );
> the results i got is that: the image did appear, but the sizes are shrinked
> as 684 X 684 , and there are THREE same images tile in the viewport, the
> first and last ones are clipped.
684 is 2048/3, plus rounding. Are you sure that when you *loaded* the image
into your pDisplayBuf, you correctly calculated where the various bytes go?
Assuming pixel values r, g, and b, storing them into your pDisplayBuf for
a given x,y (0-based coordinates 0..2047) is like this:
pDisplayBuf[x*3+y] = r;
pDisplayBuf[x*3+y+1] = g;
pDisplayBuf[x*3+y+2] = b;
Hmm... using x+y instead of x*3+y will produce a 1/3 width image and 2/3 trash.
Other possibility is you're using 3*y+x instead (confusion of x/y between your
code and what Gdk expects).
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