[Glade-users] problem in showing rgba data

[amit bag]

HI All,
         I want to show a rgba data in glade .So I fill a array with rgba data and         pass it to the data field of
 gdk_pixbuf_new_from_data const guchar (*data,GdkColorspace                 colorspace,gbooleanhas_alpha,intbits_per_sample,                                                   int width,int height,int rowstride, GdkPixbufDestroyNotify destroy_fn,
gpointer destroy_fn_data);
 I set the width to 100,height to 100 and I set the rowstrid field to width*3.After that I show the pixbuf created
by the function and it is showing perfectly.But when I reduce the width and height to 20 ,20 it not showing perfectly         i.e the buffer area is not filled properly .I fill the array of rgba data  like follows,
        char argb_buf[20*20*4];
        for(i=0;i<20*20*4;i+=4)
        {
                argb_buf[i]=255;        //For Red
                argb_buf[i+1]=0;        //For Green
                argb_buf[i+2]=0;        //For Blue
                argb_buf[i+3]=255;      //For Alpha 
        }
        For that it must show a area of 20*20 with a red color .But it not showing like that .For higher value of width and
        height I showing perfectly.Like if I gave 100 to the width and 100 to the height it show a red area of 100*100.
        Actually I do not understand how to fill the rowstride field of the above function.Please tell me how to fill the
        fields of the above function so that I get the proper out put .Thanks in advance .


Regards 
Amit Kumar Bag


       
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