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#include <Xw_Extension.h>
/* ifdef then trace on */
#ifdef TRACE
#define TRACE_GET_PIXEL
#endif
/*
STATUS Xw_get_pixel (aimage,x,y,index,npixel):
XW_EXT_IMAGEDATA *aimage
int x,y Pixel position
int *index return Pixel color index
int *npixel return Pixel number filled with
the same color index
Extract pixels index from an existing IMAGE created by Xw_get_image
or fill with Xw_put_pixel
returns ERROR if No image is defined
or No pixel color is defined
or Pixel position is wrong (Outside of image)
returns SUCCESS if successful
*/
#ifdef XW_PROTOTYPE
XW_STATUS Xw_get_pixel (void* aimage,int x,int y,int* index,int* npixel)
#else
XW_STATUS Xw_get_pixel (aimage,x,y,index,npixel)
XW_EXT_IMAGEDATA *aimage ;
int x,y ;
int *index,*npixel ;
#endif /*XW_PROTOTYPE*/
{
XW_EXT_IMAGEDATA *pimage = (XW_EXT_IMAGEDATA*) aimage ;
register union {
char *data ;
unsigned char *cdata ;
unsigned short *sdata ;
unsigned long *ldata ;
} data ;
int i=0,fpixel,simage ;
unsigned long lpixel=0 ;
XImage *pximage;
if( !Xw_isdefine_image(pimage) ) {
/*ERROR*Bad EXT_IMAGEDATA Address*/
Xw_set_error(25,"Xw_get_pixel",pimage) ;
return (XW_ERROR) ;
}
pximage = (_ZIMAGE) ? _ZIMAGE : _IIMAGE;
fpixel = x*pximage->width + y ;
simage = pximage->height*pximage->width ;
if( x < 0 || y < 0 || (fpixel >= simage) ) {
/*ERROR*Bad PIXEL position*/
Xw_set_error(47,"Xw_get_pixel",&simage) ;
return (XW_ERROR) ;
}
switch (pximage->bitmap_pad) {
case 8 :
{ register unsigned char cpixel ;
data.data = pximage->data + (fpixel) ; simage -= fpixel ;
cpixel = *data.cdata ;
for( i=1 ; i<simage ; i++ ) {
data.cdata++ ;
if( *data.cdata != cpixel ) break ;
}
}
break ;
case 16 :
{ register unsigned short spixel ;
data.data = pximage->data + (fpixel<<1) ; simage -= fpixel ;
spixel = *data.sdata ;
for( i=1 ; i<simage ; i++ ) {
data.sdata++ ;
if( *data.sdata != spixel ) break ;
}
}
break ;
case 32 :
data.data = pximage->data + (fpixel<<2) ; simage -= fpixel;
lpixel = *data.ldata ;
for( i=1 ; i<simage ; i++ ) {
data.ldata++ ;
if( *data.ldata != lpixel ) break ;
}
}
*npixel = i ;
*index = lpixel ;
for( i=0 ; i<_ICOLORMAP->maxcolor ; i++ ) {
if( _ICOLORMAP->define[i] &&
(lpixel == _ICOLORMAP->pixels[i]) ) break ;
}
if( i < _ICOLORMAP->maxcolor ) {
*index = i ;
} else {
/*ERROR*Bad Defined Color*/
Xw_set_error(41,"Xw_get_pixel",&index) ;
return (XW_ERROR) ;
}
#ifdef TRACE_GET_PIXEL
if( Xw_get_trace() > 2 ) {
printf (" Xw_get_pixel(%lx,%d,%d,%ld,%ld)\n",
(long ) pimage,x,y,(long ) index,(long ) npixel) ;
}
#endif
return (XW_SUCCESS);
}
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