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Annotation of 43BSDTahoe/new/X/showimg/calcmap.c, revision 1.1.1.1

1.1       root        1: /* Calculates gray scale based on mouse offset from window center */
                      2: #include <X/Xlib.h>
                      3: 
                      4: #ifdef MC68000
                      5: #include <sys/types.h>
                      6: #endif
                      7: 
                      8: #include "shimg.h"
                      9:    
                     10: #define MIN(a,b) (((a) < (b)) ? (a) : (b))
                     11: #define MAX(a,b) (((a) > (b)) ? (a) : (b))
                     12: 
                     13: CalcMap(winfo,cmap,x,y,ncolors,flags,key)
                     14:        WindowInfo *winfo;
                     15:        Color *cmap;
                     16:        int x,y, key;
                     17:        int ncolors;
                     18:        u_short flags;
                     19: {
                     20:        register int intercept,slope,intensity,i;
                     21: 
                     22:        if(x<0 || y<=0 || x>=winfo->width-2 || y>winfo->height) return;
                     23: 
                     24:        intercept = (((x<<1) - winfo->width)<<16) / winfo->width;
                     25:        slope = ((winfo->height - y)<<16) / y;
                     26: 
                     27:        for(i=0; i<ncolors; i++) {
                     28:                intensity = (slope * i)/(ncolors-1) + intercept;
                     29:                intensity = MIN(65535,MAX(intensity,0));
                     30:                if(flags & VOP_Inverse)  intensity = 65535 - intensity;
                     31:                if(flags & VOP_RGB) 
                     32:                    switch((int)key) {
                     33:                        case LeftButton:
                     34:                                cmap[i].red = intensity; break;
                     35:                        case MiddleButton:
                     36:                                cmap[i].green = intensity; break;
                     37:                        case RightButton:
                     38:                                cmap[i].blue = intensity; break;
                     39:                    }
                     40:                else {
                     41:                    cmap[i].red = cmap[i].blue = cmap[i].green = intensity;
                     42:                }
                     43:        }
                     44:        return;
                     45: }
                     46: 
                     47: initcmap(ncolors,cmap,pixel,nplanes,flags)
                     48:      int ncolors, nplanes, pixel;
                     49:      Color *cmap;
                     50:      unsigned short flags;
                     51: {
                     52:      int i;
                     53: 
                     54: /* Initialize color map to slope 1, intercept 0 */
                     55:      for (i = 0; i < ncolors; i++) {
                     56:        cmap[i].pixel = pixel + i;
                     57:        cmap[i].red = cmap[i].green = cmap[i].blue =
                     58:            ( (flags & VOP_Inverse) ? (65535 - (i << (16 - nplanes))) :
                     59:              (i << (16 - nplanes)));
                     60:      }
                     61:      return;
                     62: }

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