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#include <Xw_Extension.h>
/* ifdef then trace on */
#ifdef TRACE
#define TRACE_GET_RGBPIXEL
#endif
/*
STATUS Xw_get_rgbpixel (aimage,x,y,r,g,b,npixel):
XW_EXT_IMAGEDATA *aimage
int x,y Pixel position
float *r,*g,*b return R,G,B Pixel values
int *npixel return Pixel number filled with
the same color index
Extract RGB pixels from an existing IMAGE created by Xw_get_image
returns ERROR if Extended Image is not defined
or VISUAL Image type is not TRUECOLOR
or Pixel position is wrong (Outside of image)
returns SUCCESS if successful
*/
#ifdef XW_PROTOTYPE
XW_STATUS Xw_get_rgbpixel (void* aimage,
int x,int y,float* r,float* g,float* b,int* npixel)
#else
XW_STATUS Xw_get_rgbpixel (aimage,x,y,r,g,b,npixel)
void *aimage ;
int x,y ;
float *r,*g,*b ;
int *npixel ;
#endif /*XW_PROTOTYPE*/
{
XW_EXT_IMAGEDATA *pimage = (XW_EXT_IMAGEDATA*) aimage ;
XW_EXT_COLORMAP *pcolormap = pimage->pcolormap ;
union {
char *data ;
unsigned char *cdata ;
unsigned short *sdata ;
unsigned long *ldata ;
} data ;
int i=0,fpixel,simage ;
unsigned long pixel=0 ;
XColor color ;
XImage *pximage;
if( !Xw_isdefine_image(pimage) ) {
/*ERROR*Bad EXT_IMAGEDATA Address*/
Xw_set_error(25,"Xw_get_rgbpixel",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_rgbpixel",&simage) ;
return (XW_ERROR) ;
}
switch (pximage->bitmap_pad) {
case 8 :
data.data = pximage->data + (fpixel) ; simage -= fpixel ;
pixel = (unsigned long) *data.cdata ;
for( i=1 ; i<simage ; i++ ) {
data.cdata++ ;
if( *data.cdata != (unsigned char) pixel ) break ;
}
break ;
case 16 :
data.data = pximage->data + (fpixel<<1) ; simage -= fpixel ;
pixel = (unsigned long) *data.sdata ;
for( i=1 ; i<simage ; i++ ) {
data.sdata++ ;
if( *data.sdata != (unsigned short) pixel ) break ;
}
break ;
case 32 :
data.data = pximage->data + (fpixel<<2) ; simage -= fpixel ;
pixel = (unsigned long) *data.ldata ;
for( i=1 ; i<simage ; i++ ) {
data.ldata++ ;
if( *data.ldata != (unsigned long) pixel ) break ;
}
}
*npixel = i ;
switch ( _CCLASS ) {
case TrueColor :
{ unsigned long mask = _CVISUAL->map_entries-1 ;
unsigned long red,green,blue ;
unsigned long rmask = _CVISUAL->red_mask ;
unsigned long gmask = _CVISUAL->green_mask ;
unsigned long bmask = _CVISUAL->blue_mask ;
red = pixel & rmask ;
while ( !(rmask & 0x01) ) { rmask >>= 1; red >>= 1; }
green = pixel & gmask ;
while ( !(gmask & 0x01) ) { gmask >>= 1; green >>= 1; }
blue = pixel & bmask ;
while ( !(bmask & 0x01) ) { bmask >>= 1; blue >>= 1; }
*r = (float)red/mask ;
*g = (float)green/mask ;
*b = (float)blue/mask ;
}
break ;
case PseudoColor :
color.pixel = pixel ;
XQueryColor(_CDISPLAY,_CINFO.colormap,&color) ;
*r = (float) color.red/0xFFFF ;
*g = (float) color.green/0xFFFF ;
*b = (float) color.blue/0xFFFF ;
break ;
default :
/*ERROR*Unimplemented Visual Class*/
Xw_set_error(5,"Xw_get_rgbpixel",&_CCLASS) ;
return (XW_ERROR) ;
}
#ifdef TRACE_GET_RGBPIXEL
printf (" Xw_get_rgbpixel(%lx,%d,%d,%f,%f,%f,%d)\n",
(long ) pimage,x,y,*r,*g,*b,*npixel) ;
#endif
return (XW_SUCCESS);
}
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