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#include <Xw_Extension.h>
#define MAXISIZE 1600*1200
/* ifdef then trace on */
#ifdef TRACE
# define TRACE_ZOOM_IMAGE
#endif
/*
XW_STATUS Xw_zoom_image (aimage,zoom):
XW_EXT_IMAGEDATA *aimage Image to ZOOM
float zoom Zoom Coef to apply (>0.)
Apply a ZOOM factor to an image
returns ERROR if bad zoom factor
returns SUCCESS if successfull
*/
#ifdef XW_PROTOTYPE
XW_STATUS Xw_zoom_image (void* aimage,float zoom)
#else
XW_STATUS Xw_zoom_image (aimage,zoom)
void *aimage;
float zoom ;
#endif /*XW_PROTOTYPE*/
{
XW_EXT_IMAGEDATA *pimage = (XW_EXT_IMAGEDATA*)aimage ;
XImage *pximage,*qximage ;
int i,j,isize,wp,hp,xp,yp,xq,yq,xn,yn,dxp,dyp,npixel,num_pixel[MAXCOLOR] ;
unsigned long pixel,bpixel,tab_pixel[MAXCOLOR];
if( !Xw_isdefine_image(pimage) ) {
/*ERROR*Bad EXT_IMAGE Address*/
Xw_set_error(25,"Xw_zoom_image",pimage) ;
return (XW_ERROR) ;
}
if( zoom <= 0. ) {
/*ERROR*Bad Image Zoom factor*/
Xw_set_error(113,"Xw_zoom_image",&zoom) ;
return (XW_ERROR) ;
}
pximage = pimage->pximage ;
qximage = (XImage*) Xw_malloc(sizeof(XImage)) ;
if( !qximage ) {
/*ERROR*XImage Allocation failed*/
Xw_set_error(60,"Xw_zoom_image",NULL) ;
return (XW_ERROR) ;
}
Xw_bytecopy((char*)pximage,(char*)qximage,sizeof(XImage)) ;
wp = pximage->width; hp = pximage->height;
qximage->width = (int )( wp * zoom );
qximage->height = (int )( hp * zoom );
dxp = dyp = 0;
double datasize = qximage->width*qximage->height;
if (datasize > MAXISIZE) {
// ERROR*ZOOM factor is too big
printf(" ***Xw_zoom_image(%f).Too BIG zoom, full image can't be zoomed.\n",zoom);
Xw_set_error(130, "Xw_zoom_image", &zoom);
return (XW_ERROR);
}
if (fabs(zoom - pimage->zoom) < 0.01) {
return XW_SUCCESS;
}
qximage->bytes_per_line = qximage->width * (pximage->bitmap_pad/8) ;
isize = qximage->bytes_per_line * qximage->height ;
qximage->data = (char*) Xw_malloc(isize) ;
if( !qximage->data ) {
/*ERROR*XImage Allocation failed*/
Xw_set_error(60,"Xw_zoom_image",NULL) ;
return (XW_ERROR) ;
}
bpixel = XGetPixel(pximage,0,0) ;
if( zoom > 1. ) {
for( yp=yq=0 ; yp<hp ; yq=yn,yp++ ) {
yn = (int )( (yp+1)*zoom+0.5 );
if( yn >= qximage->height ) yn = qximage->height-1 ;
for( xp=xq=0 ; xp<wp ; xq=xn,xp++ ) {
xn = (int )( (xp+1)*zoom+0.5 );
if( xn >= qximage->width ) xn = qximage->width-1 ;
pixel = XGetPixel(pximage,xp+dxp,yp+dyp) ;
if( ((xn-xq) > 1) || ((yn-yq) > 1) ) {
register int x,y;
for( y=yq ; y<yn ; y++ ) {
for( x=xq ; x<xn ; x++ ) {
XPutPixel(qximage,x,y,pixel) ;
}
}
} else {
XPutPixel(qximage,xq,yq,pixel) ;
}
}
}
} else {
for( yp=yq=0 ; yq<qximage->height ; yp=yn,yq++ ) {
yn = (int )( (yq+1)/zoom+0.5 );
if( yn >= pximage->height ) yn = pximage->height-1 ;
for( xp=xq=0 ; xq<qximage->width ; xp=xn,xq++ ) {
xn = (int )( (xq+1)/zoom+0.5 );
if( xn >= pximage->width ) xn = pximage->width-1 ;
if( xn-1 > xp && yn-1 > yp ) {
register int x,y,ipixel = 0;
npixel = 0;
for( y=yp ; y<yn ; y++ ) {
for( x=xp ; x<xn ; x++ ) {
pixel = XGetPixel(pximage,x,y) ;
if( pixel != bpixel ) {
for( i=0 ; i<npixel ; i++) {
if( pixel == tab_pixel[ipixel] ) {
num_pixel[ipixel]++;
break;
}
ipixel++;
if( ipixel >= npixel ) ipixel = 0;
}
if( i >= npixel ) {
ipixel = npixel;
num_pixel[npixel] = 1;
tab_pixel[npixel] = pixel;
if( npixel < MAXCOLOR-1 ) npixel++;
}
}
}
}
if( npixel > 0 ) {
j = 0;
for( i=1 ; i<npixel ; i++ ) {
if( num_pixel[i] > num_pixel[j] ) j = i;
}
bpixel = pixel = tab_pixel[j];
} else {
pixel = bpixel;
}
} else {
pixel = XGetPixel(pximage,xp,yp) ;
}
XPutPixel(qximage,xq,yq,pixel) ;
}
}
}
if( _ZIMAGE && (_ZIMAGE != _IIMAGE) ) {
XDestroyImage(_ZIMAGE);
}
_ZIMAGE = qximage;
pimage->zoom = zoom;
#ifdef TRACE_ZOOM_IMAGE
if( Xw_get_trace() ) {
printf (" Xw_zoom_image(%lx,%f)\n",(long ) pimage,zoom);
}
#endif
return (XW_SUCCESS);
}
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