/**************************************************************************
 *
 * AESFAST PD utilties.
 *
 *  Rectangle utilities 5...
 *    rc_gadjust                (formerly objclg_adjust)
 *    rc_vadjust                (formerly objclv_adjust)
 *
 *  02/28/89 v1.3
 *           Added code to prevent any returned structure element from
 *           being negative, since negative screen indicies do bad things
 *           on a blit, and tend to leave sleeping crashes lurking in the
 *           system if used as the clipping rectangle for objc_draw.
 *************************************************************************/

#include <gemfast.h>

/*-------------------------------------------------------------------------
 * rc_gadjust - Adjust a GRECT-type rectangle in the x and/or y coordinate.
 *-----------------------------------------------------------------------*/
 
void
rc_gadjust(prect, xadjust, yadjust)
    register GRECT  *prect;
    int             xadjust;
    int             yadjust;
{
    prect->g_x -= xadjust;
    prect->g_y -= yadjust;
    prect->g_w += xadjust * 2;
    prect->g_h += yadjust * 2;
    
    if (prect->g_x < 0) {
        prect->g_x = 0;
    }
    
    if (prect->g_y < 0) {
        prect->g_y = 0;
    }
    
    if (prect->g_w < 0) {
        prect->g_w = 0;
    }
    
    if (prect->g_h < 0) {
        prect->g_h = 0;
    }
} 

/*-------------------------------------------------------------------------
 * rc_vadjust - Adjust a VRECT-type rectangle in the x and/or y coordinate.
 *-----------------------------------------------------------------------*/
 
void
rc_vadjust(prect, xadjust, yadjust)
    register VRECT  *prect;
    int             xadjust;
    int             yadjust;
{
    prect->v_x1 -= xadjust;
    prect->v_y1 -= yadjust;
    prect->v_x2 += xadjust;
    prect->v_y2 += yadjust;
    
    if (prect->v_x1 < 0) {
        prect->v_x1 = 0;
    }
    
    if (prect->v_y1 < 0) {
        prect->v_y1 = 0;
    }
    
    if (prect->v_x2 < 0) {
        prect->v_x2 = 0;
    }
    
    if (prect->v_y2 < 0) {
        prect->v_y2 = 0;
    }
}