Re: gdk_draw_gray_image problem

[John Cupitt ng-london org uk]

Hiya, almost exactly that code works for me, so I guess the problem must 
be somewhere else :-(

Does testrgb work OK? If it does, what's that code doing that you're not 
doing?

Peter Van Osta wrote:
> I ahve problem with "gdk_draw_gray_image". The code to display a
> greyvalue image is shown below. If I take gdk_draw_gray_image" out of
> the loop or reduce the number of loops below 3, either a solid grey
> image window display is shown (0 loops ) or only the lower half of the
> image (2 loops) ?
> 
> Anyone any information about what is going wrong ( the test code is
> somewhat modified for clarity)?
> 
> Best regards,
> 
> Peter
> 
> 
> void xyz_rgb_display (GtkWidget *drawing_area, image *im )
> {
>   
>   int *p = NULL;
>   guchar buf[WIDTH * HEIGHT * 3];
>   gint i = 0, j = 0;
>   gboolean dither = 1;
> 
>   p = image_data( im );
>   
>   for (j = 0; j < WIDTH * HEIGHT; j++)
>      buf[j] = *p++;;
>  
>   for( i = 0; i < 3; i++ ){
>      gdk_draw_gray_image (drawing_area->window,
> 			  drawing_area->style->white_gc,
> 			  0, 0, WIDTH, HEIGHT,
> 			  dither ? GDK_RGB_DITHER_MAX :
> 			  GDK_RGB_DITHER_NONE,
> 			  buf, WIDTH);
>    }
> }



========================================================== 
Aelbert Cuyp 13 February - 12 May 2002 

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