src/px/ximage.c

/* Copyright (c) 1987 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  ximage.c - driver for X-windows
 *
 *     4/30/87
 *     3/3/88           Added calls to xraster & Paul Heckbert's ciq routines
 */

#include  "standard.h"

#include  <X/Xlib.h>
#include  <X/cursors/bcross.cursor>
#include  <X/cursors/bcross_mask.cursor>

#include  <sys/types.h>

#include  <ctype.h>

#include  "color.h"

#include  "xraster.h"

#include  "view.h"

#include  "pic.h"

#include  "random.h"

#define  controlshift(e)        (((XButtonEvent *)(e))->detail & (ShiftMask|ControlMask))

#define  FONTNAME       "9x15"          /* text font we'll use */

#define  CTRL(c)        ('c'-'@')

#define  BORWIDTH       5               /* border width */
#define  BARHEIGHT      25              /* menu bar size */

double  gamcor = 2.2;                   /* gamma correction */

XRASTER  *ourras = NULL;                /* our stored raster image */

int  dither = 1;                        /* dither colors? */
int  fast = 0;                          /* keep picture in Pixmap? */

Window  wind = 0;                       /* our output window */
Font  fontid;                           /* our font */

int  maxcolors = 0;                     /* maximum colors */
int  greyscale = 0;                     /* in grey */

int  scale = 0;                         /* scalefactor; power of two */

int  xoff = 0;                          /* x image offset */
int  yoff = 0;                          /* y image offset */

VIEW  ourview = STDVIEW;                /* image view parameters */
int  gotview = 0;                       /* got parameters from file */

COLR  *scanline;                        /* scan line buffer */

int  xmax, ymax;                        /* picture resolution */
int  width, height;                     /* window size */
char  *fname = NULL;                    /* input file name */
FILE  *fin = stdin;                     /* input file */
long  *scanpos = NULL;                  /* scan line positions in file */
int  cury = 0;                          /* current scan location */

double  exposure = 1.0;                 /* exposure compensation used */

struct {
        int  xmin, ymin, xsiz, ysiz;
}  box = {0, 0, 0, 0};                  /* current box */

char  *geometry = NULL;                 /* geometry specification */

char  *progname;

char  errmsg[128];

extern long  ftell();

extern char  *malloc(), *calloc();

extern double  atof(), pow(), log();


main(argc, argv)
int  argc;
char  *argv[];
{
        int  headline();
        int  i;
        
        progname = argv[0];

        for (i = 1; i < argc; i++)
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'c':
                                maxcolors = atoi(argv[++i]);
                                break;
                        case 'b':
                                greyscale = !greyscale;
                                break;
                        case 'm':
                                maxcolors = 2;
                                break;
                        case 'd':
                                dither = !dither;
                                break;
                        case 'f':
                                fast = !fast;
                                break;
                        case 'e':
                                if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
                                        goto userr;
                                scale = atoi(argv[++i]);
                                break;
                        case 'g':
                                gamcor = atof(argv[++i]);
                                break;
                        default:
                                goto userr;
                        }
                else if (argv[i][0] == '=')
                        geometry = argv[i];
                else
                        break;

        if (argc-i == 1) {
                fname = argv[i];
                fin = fopen(fname, "r");
                if (fin == NULL) {
                        sprintf(errmsg, "can't open file \"%s\"", fname);
                        quiterr(errmsg);
                }
        }
                                /* get header */
        getheader(fin, headline);
                                /* get picture dimensions */
        if (fgetresolu(&xmax, &ymax, fin) != (YMAJOR|YDECR))
                quiterr("bad picture size");
                                /* set view parameters */
        if (gotview && setview(&ourview) != NULL)
                gotview = 0;
        if ((scanline = (COLR *)malloc(xmax*sizeof(COLR))) == NULL)
                quiterr("out of memory");

        init();                 /* get file and open window */

        for ( ; ; )
                getevent();             /* main loop */
userr:
        fprintf(stderr,
        "Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
                        progname);
        quit(1);
}


headline(s)             /* get relevant info from header */
char  *s;
{
        static char  *altname[] = {"rview","rpict",VIEWSTR,NULL};
        register char  **an;

        if (isexpos(s))
                exposure *= exposval(s);
        else
                for (an = altname; *an != NULL; an++)
                        if (!strncmp(*an, s, strlen(*an))) {
                                if (sscanview(&ourview, s+strlen(*an)) > 0)
                                        gotview++;
                                return;
                        }
}


init()                  /* get data and open window */
{
        register int  i;
        OpaqueFrame  mainframe;
        char  defgeom[32];
        
        if (fname != NULL) {
                scanpos = (long *)malloc(ymax*sizeof(long));
                if (scanpos == NULL)
                        goto memerr;
                for (i = 0; i < ymax; i++)
                        scanpos[i] = -1;
        }
        if (XOpenDisplay(NULL) == NULL)
                quiterr("can't open display; DISPLAY variable set?");
#ifdef notdef
        if (DisplayWidth() - 2*BORWIDTH < xmax ||
                        DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
                quiterr("resolution mismatch");
#endif
        if (maxcolors == 0) {           /* get number of available colors */
                maxcolors = 1<<DisplayPlanes();
                if (maxcolors > 4) maxcolors -= 2;
        }
                                /* store image */
        getras();

        mainframe.bdrwidth = BORWIDTH;
        mainframe.border = WhitePixmap;
        mainframe.background = BlackPixmap;
        sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
        wind = XCreate("Radiance Image", progname, geometry, defgeom,
                        &mainframe, 16, 16);
        if (wind == 0)
                quiterr("can't create window");
        width = mainframe.width;
        height = mainframe.height;
        fontid = XGetFont(FONTNAME);
        if (fontid == 0)
                quiterr("can't get font");
        XStoreName(wind, fname == NULL ? progname : fname);
        XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
                        bcross_bits, bcross_mask_bits,
                        bcross_x_hot, bcross_y_hot,
                        BlackPixel, WhitePixel, GXcopy));
        XSelectInput(wind, ButtonPressed|ButtonReleased|UnmapWindow
                        |RightDownMotion|MiddleDownMotion|LeftDownMotion
                        |KeyPressed|ExposeWindow|ExposeRegion);
        XMapWindow(wind);
        return;
memerr:
        quiterr("out of memory");
}


quiterr(err)            /* print message and exit */
char  *err;
{
        if (err != NULL)
                fprintf(stderr, "%s: %s\n", progname, err);

        exit(err == NULL ? 0 : 1);
}


eputs(s)
char    *s;
{
        fputs(s, stderr);
}


quit(code)
int  code;
{
        exit(code);
}


getras()                                /* get raster file */
{
        colormap        ourmap;

        ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
        if (ourras == NULL)
                goto memerr;
        ourras->width = xmax;
        ourras->height = ymax;
        if (maxcolors <= 2) {           /* monochrome */
                ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
                if (ourras->data.m == NULL)
                        goto memerr;
                getmono();
        } else {
                ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
                if (ourras->data.bz == NULL)
                        goto memerr;
                if (greyscale)
                        biq(dither,maxcolors,1,ourmap);
                else
                        ciq(dither,maxcolors,1,ourmap);
                if (init_rcolors(ourras, ourmap) == 0)
                        goto memerr;
        }
        return;
memerr:
        quiterr("out of memory");
}


getevent()                              /* process the next event */
{
        WindowInfo  info;
        XEvent  e;

        XNextEvent(&e);
        switch (e.type) {
        case KeyPressed:
                docom(&e);
                break;
        case ExposeWindow:
                XQueryWindow(wind, &info);      /* in case resized */
                width = info.width;
                height = info.height;
        /* fall through */
        case ExposeRegion:
                fixwindow(&e);
                break;
        case UnmapWindow:
                unmap_rcolors(ourras);
                break;
        case ButtonPressed:
                if (controlshift(&e))
                        moveimage(&e);
                else
                        getbox(&e);
                break;
        }
}


fixwindow(eexp)                         /* fix new or stepped-on window */
XExposeEvent  *eexp;
{
        redraw(eexp->x, eexp->y, eexp->width, eexp->height);
}


redraw(x, y, w, h)                      /* redraw section of window */
int  x, y;
int  w, h;
{
        if (ourras->ncolors && map_rcolors(ourras) == NULL) {
                fprintf(stderr, "%s: cannot allocate colors\n", progname);
                return(-1);
        }
        if (fast)
                make_rpixmap(ourras);
        return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
}


docom(ekey)                                     /* execute command */
XKeyEvent  *ekey;
{
        char  buf[80];
        COLOR  cval;
        Color  cvx;
        char  *cp;
        int  n;
        double  comp;
        FVECT  rorg, rdir;

        cp = XLookupMapping(ekey, &n);
        if (n == 0)
                return(0);
        switch (*cp) {                  /* interpret command */
        case 'q':
        case CTRL(D):                           /* quit */
                quit(0);
        case '\n':
        case '\r':
        case 'l':
        case 'c':                               /* value */
                if (avgbox(cval) == -1)
                        return(-1);
                switch (*cp) {
                case '\n':
                case '\r':                              /* radiance */
                        sprintf(buf, "%.3f", intens(cval)/exposure);
                        break;
                case 'l':                               /* luminance */
                        sprintf(buf, "%.0fn", bright(cval)*683.0/exposure);
                        break;
                case 'c':                               /* color */
                        comp = pow(2.0, (double)scale);
                        sprintf(buf, "(%.2f,%.2f,%.2f)",
                                        colval(cval,RED)*comp,
                                        colval(cval,GRN)*comp,
                                        colval(cval,BLU)*comp);
                        break;
                }
                XText(wind, box.xmin, box.ymin, buf, strlen(buf),
                                fontid, BlackPixel, WhitePixel);
                return(0);
        case 'i':                               /* identify (contour) */
                if (ourras->pixels == NULL)
                        return(-1);
                n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
                n = ourras->pmap[n];
                cvx.pixel = ourras->cdefs[n].pixel;
                cvx.red = random() & 65535;
                cvx.green = random() & 65535;
                cvx.blue = random() & 65535;
                XStoreColor(&cvx);
                return(0);
        case 'p':                               /* position */
                sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
                XText(wind, ekey->x, ekey->y, buf, strlen(buf),
                                fontid, BlackPixel, WhitePixel);
                return(0);
        case 't':                               /* trace */
                if (!gotview) {
                        XFeep(0);
                        return(-1);
                }
                if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
                                (ymax-1-ekey->y+yoff+.5)/ymax) < 0)
                        return(-1);
                printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
                printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
                fflush(stdout);
                return(0);
        case '=':                               /* adjust exposure */
                if (avgbox(cval) == -1)
                        return(-1);
                n = log(.5/bright(cval))/.69315 - scale;        /* truncate */
                if (n == 0)
                        return(0);
                scale_rcolors(ourras, pow(2.0, (double)n));
                scale += n;
                sprintf(buf, "%+d", scale);
                XText(wind, box.xmin, box.ymin, buf, strlen(buf),
                                fontid, BlackPixel, WhitePixel);
                XFlush();
                free_raster(ourras);
                getras();
        /* fall through */
        case CTRL(R):                           /* redraw */
        case CTRL(L):
                unmap_rcolors(ourras);
                XClear(wind);
                return(redraw(0, 0, width, height));
        case ' ':                               /* clear */
                return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
        default:
                XFeep(0);
                return(-1);
        }
}


moveimage(ep)                           /* shift the image */
XButtonEvent  *ep;
{
        XButtonEvent  eb;

        XMaskEvent(ButtonReleased, &eb);
        xoff += eb.x - ep->x;
        yoff += eb.y - ep->y;
        XClear(wind);
        return(redraw(0, 0, width, height));
}


getbox(ebut)                            /* get new box */
XButtonEvent  *ebut;
{
        union {
                XEvent  e;
                XButtonEvent  b;
                XMouseMovedEvent  m;
        }  e;

        XMaskEvent(ButtonReleased|MouseMoved, &e.e);
        while (e.e.type == MouseMoved) {
                revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
                XMaskEvent(ButtonReleased|MouseMoved, &e.e);
                revbox(ebut->x, ebut->y, box.xmin, box.ymin);
        }
        box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
        box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
        if (box.xmin > ebut->x) {
                box.xsiz = box.xmin - ebut->x + 1;
                box.xmin = ebut->x;
        } else {
                box.xsiz = ebut->x - box.xmin + 1;
        }
        if (box.ymin > ebut->y) {
                box.ysiz = box.ymin - ebut->y + 1;
                box.ymin = ebut->y;
        } else {
                box.ysiz = ebut->y - box.ymin + 1;
        }
}


revbox(x0, y0, x1, y1)                  /* draw box with reversed lines */
int  x0, y0, x1, y1;
{
        XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
        XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
        XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
        XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
}


avgbox(clr)                             /* average color over current box */
COLOR  clr;
{
        int  left, right, top, bottom;
        int  y;
        double  d;
        COLOR  ctmp;
        register int  x;

        setcolor(clr, 0.0, 0.0, 0.0);
        left = box.xmin - xoff;
        right = left + box.xsiz;
        if (left < 0)
                left = 0;
        if (right > xmax)
                right = xmax;
        if (left >= right)
                return(-1);
        top = box.ymin - yoff;
        bottom = top + box.ysiz;
        if (top < 0)
                top = 0;
        if (bottom > ymax)
                bottom = ymax;
        if (top >= bottom)
                return(-1);
        for (y = top; y < bottom; y++) {
                if (getscan(y) == -1)
                        return(-1);
                for (x = left; x < right; x++) {
                        colr_color(ctmp, scanline[x]);
                        addcolor(clr, ctmp);
                }
        }
        d = 1.0/((right-left)*(bottom-top));
        scalecolor(clr, d);
        return(0);
}


getmono()                       /* get monochrome data */
{
        register unsigned short *dp;
        register int    x, err;
        int     y;
        rgbpixel        *inl;
        short   *cerr;

        if ((inl = (rgbpixel *)malloc(xmax*sizeof(rgbpixel))) == NULL
                        || (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
                quiterr("out of memory in getmono");
        dp = ourras->data.m - 1;
        for (y = 0; y < ymax; y++) {
                picreadline3(y, inl);
                err = 0;
                for (x = 0; x < xmax; x++) {
                        if (!(x&0xf))
                                *++dp = 0;
                        err += rgb_bright(&inl[x]) + cerr[x];
                        if (err > 127)
                                err -= 255;
                        else
                                *dp |= 1<<(x&0xf);
                        cerr[x] = err >>= 1;
                }
        }
        free((char *)inl);
        free((char *)cerr);
}


init_rcolors(xr, cmap)                          /* (re)assign color values */
register XRASTER        *xr;
colormap        cmap;
{
        register int    i;
        register unsigned char  *p;

        xr->pmap = (int *)malloc(256*sizeof(int));
        if (xr->pmap == NULL)
                return(0);
        xr->cdefs = (Color *)malloc(256*sizeof(Color));
        if (xr->cdefs == NULL)
                return(0);
        for (i = 0; i < 256; i++)
                xr->pmap[i] = -1;
        xr->ncolors = 0;
        for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
                if (xr->pmap[*p] == -1) {
                        xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
                        xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
                        xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
                        xr->cdefs[xr->ncolors].pixel = *p;
                        xr->pmap[*p] = xr->ncolors++;
                }
        xr->cdefs = (Color *)realloc((char *)xr->cdefs, xr->ncolors*sizeof(Color));
        if (xr->cdefs == NULL)
                return(0);
        return(1);
}


scale_rcolors(xr, sf)                   /* scale color map */
register XRASTER        *xr;
double  sf;
{
        register int    i;
        long    maxv;

        if (xr->pixels == NULL)
                return;

        sf = pow(sf, 1.0/gamcor);
        maxv = 65535/sf;

        for (i = xr->ncolors; i--; ) {
                xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
                                65535 :
                                xr->cdefs[i].red * sf;
                xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
                                65535 :
                                xr->cdefs[i].green * sf;
                xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
                                65535 :
                                xr->cdefs[i].blue * sf;
        }
        XStoreColors(xr->ncolors, xr->cdefs);
}


getscan(y)
int  y;
{
        if (y != cury) {
                if (scanpos == NULL || scanpos[y] == -1)
                        return(-1);
                if (fseek(fin, scanpos[y], 0) == -1)
                        quiterr("fseek error");
                cury = y;
        } else if (scanpos != NULL)
                scanpos[y] = ftell(fin);

        if (freadcolrs(scanline, xmax, fin) < 0)
                quiterr("read error");

        cury++;
        return(0);
}


picreadline3(y, l3)                     /* read in 3-byte scanline */
int  y;
register rgbpixel  *l3;
{
        register int    i;
                                                        /* read scanline */
        if (getscan(y) < 0)
                quiterr("cannot seek for picreadline");
                                                        /* convert scanline */
        normcolrs(scanline, xmax, scale);
        for (i = 0; i < xmax; i++) {
                l3[i].r = scanline[i][RED];
                l3[i].g = scanline[i][GRN];
                l3[i].b = scanline[i][BLU];
        }
}


picwriteline(y, l)              /* add 8-bit scanline to image */
int  y;
pixel  *l;
{
        bcopy((char *)l, (char *)ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1));
}


picreadcm(map)                  /* do gamma correction */
colormap  map;
{
        extern double  pow();
        register int  i, val;

        for (i = 0; i < 256; i++) {
                val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
                map[0][i] = map[1][i] = map[2][i] = val;
        }
}


picwritecm(map)                 /* handled elsewhere */
colormap  map;
{
#ifdef DEBUG
        register int i;

        for (i = 0; i < 256; i++)
                printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
#endif
}
Revision:	1.27
Committed:	Wed Nov 7 13:10:39 1990 UTC (33 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.26:	+1 -1 lines
Log Message:	minor improvement in gamma correction
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1987 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* ximage.c - driver for X-windows
9			*
10			* 4/30/87
11			* 3/3/88 Added calls to xraster & Paul Heckbert's ciq routines
12			*/
13
14			#include "standard.h"
15
16			#include <X/Xlib.h>
17			#include <X/cursors/bcross.cursor>
18			#include <X/cursors/bcross_mask.cursor>
19
20			#include <sys/types.h>
21
22			#include <ctype.h>
23
24			#include "color.h"
25
26			#include "xraster.h"
27
28			#include "view.h"
29
30			#include "pic.h"
31
32	greg	1.15	#include "random.h"
33
34	greg	1.1	#define controlshift(e) (((XButtonEvent *)(e))->detail & (ShiftMask\|ControlMask))
35
36			#define FONTNAME "9x15" /* text font we'll use */
37
38			#define CTRL(c) ('c'-'@')
39
40			#define BORWIDTH 5 /* border width */
41			#define BARHEIGHT 25 /* menu bar size */
42
43	greg	1.11	double gamcor = 2.2; /* gamma correction */
44	greg	1.1
45	greg	1.2	XRASTER ourras = NULL; / our stored raster image */
46	greg	1.1
47			int dither = 1; /* dither colors? */
48			int fast = 0; /* keep picture in Pixmap? */
49
50			Window wind = 0; /* our output window */
51			Font fontid; /* our font */
52
53			int maxcolors = 0; /* maximum colors */
54			int greyscale = 0; /* in grey */
55
56	greg	1.2	int scale = 0; /* scalefactor; power of two */
57
58	greg	1.1	int xoff = 0; /* x image offset */
59			int yoff = 0; /* y image offset */
60
61	greg	1.21	VIEW ourview = STDVIEW; /* image view parameters */
62	greg	1.1	int gotview = 0; /* got parameters from file */
63
64			COLR scanline; / scan line buffer */
65
66			int xmax, ymax; /* picture resolution */
67			int width, height; /* window size */
68			char fname = NULL; / input file name */
69			FILE fin = stdin; / input file */
70			long scanpos = NULL; / scan line positions in file */
71			int cury = 0; /* current scan location */
72
73			double exposure = 1.0; /* exposure compensation used */
74
75			struct {
76			int xmin, ymin, xsiz, ysiz;
77			} box = {0, 0, 0, 0}; /* current box */
78
79			char geometry = NULL; / geometry specification */
80
81			char *progname;
82
83			char errmsg[128];
84
85			extern long ftell();
86
87			extern char malloc(), calloc();
88
89	greg	1.2	extern double atof(), pow(), log();
90	greg	1.1
91
92			main(argc, argv)
93			int argc;
94			char *argv[];
95			{
96			int headline();
97			int i;
98
99			progname = argv[0];
100
101			for (i = 1; i < argc; i++)
102			if (argv[i][0] == '-')
103			switch (argv[i][1]) {
104			case 'c':
105			maxcolors = atoi(argv[++i]);
106			break;
107			case 'b':
108			greyscale = !greyscale;
109			break;
110			case 'm':
111			maxcolors = 2;
112			break;
113			case 'd':
114			dither = !dither;
115			break;
116			case 'f':
117			fast = !fast;
118			break;
119	greg	1.2	case 'e':
120			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
121			goto userr;
122			scale = atoi(argv[++i]);
123			break;
124	greg	1.1	case 'g':
125			gamcor = atof(argv[++i]);
126			break;
127			default:
128			goto userr;
129			}
130			else if (argv[i][0] == '=')
131			geometry = argv[i];
132			else
133			break;
134
135			if (argc-i == 1) {
136			fname = argv[i];
137			fin = fopen(fname, "r");
138			if (fin == NULL) {
139			sprintf(errmsg, "can't open file \"%s\"", fname);
140			quiterr(errmsg);
141			}
142	greg	1.6	}
143	greg	1.1	/* get header */
144			getheader(fin, headline);
145			/* get picture dimensions */
146	greg	1.9	if (fgetresolu(&xmax, &ymax, fin) != (YMAJOR\|YDECR))
147	greg	1.1	quiterr("bad picture size");
148			/* set view parameters */
149	greg	1.21	if (gotview && setview(&ourview) != NULL)
150			gotview = 0;
151	greg	1.1	if ((scanline = (COLR )malloc(xmaxsizeof(COLR))) == NULL)
152			quiterr("out of memory");
153
154			init(); /* get file and open window */
155
156			for ( ; ; )
157			getevent(); /* main loop */
158			userr:
159			fprintf(stderr,
160	greg	1.2	"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
161	greg	1.1	progname);
162			quit(1);
163			}
164
165
166			headline(s) /* get relevant info from header */
167			char *s;
168			{
169	greg	1.4	static char *altname[] = {"rview","rpict",VIEWSTR,NULL};
170	greg	1.1	register char **an;
171
172	greg	1.20	if (isexpos(s))
173			exposure *= exposval(s);
174	greg	1.1	else
175			for (an = altname; *an != NULL; an++)
176			if (!strncmp(an, s, strlen(an))) {
177	greg	1.21	if (sscanview(&ourview, s+strlen(*an)) > 0)
178	greg	1.1	gotview++;
179			return;
180			}
181			}
182
183
184			init() /* get data and open window */
185			{
186			register int i;
187			OpaqueFrame mainframe;
188			char defgeom[32];
189
190			if (fname != NULL) {
191			scanpos = (long )malloc(ymaxsizeof(long));
192			if (scanpos == NULL)
193			goto memerr;
194			for (i = 0; i < ymax; i++)
195			scanpos[i] = -1;
196			}
197			if (XOpenDisplay(NULL) == NULL)
198			quiterr("can't open display; DISPLAY variable set?");
199			#ifdef notdef
200			if (DisplayWidth() - 2*BORWIDTH < xmax \|\|
201			DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
202			quiterr("resolution mismatch");
203			#endif
204			if (maxcolors == 0) { /* get number of available colors */
205			maxcolors = 1<<DisplayPlanes();
206			if (maxcolors > 4) maxcolors -= 2;
207			}
208			/* store image */
209	greg	1.2	getras();
210
211	greg	1.1	mainframe.bdrwidth = BORWIDTH;
212			mainframe.border = WhitePixmap;
213			mainframe.background = BlackPixmap;
214			sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
215			wind = XCreate("Radiance Image", progname, geometry, defgeom,
216			&mainframe, 16, 16);
217			if (wind == 0)
218			quiterr("can't create window");
219			width = mainframe.width;
220			height = mainframe.height;
221			fontid = XGetFont(FONTNAME);
222			if (fontid == 0)
223			quiterr("can't get font");
224			XStoreName(wind, fname == NULL ? progname : fname);
225			XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
226			bcross_bits, bcross_mask_bits,
227			bcross_x_hot, bcross_y_hot,
228			BlackPixel, WhitePixel, GXcopy));
229			XSelectInput(wind, ButtonPressed\|ButtonReleased\|UnmapWindow
230			\|RightDownMotion\|MiddleDownMotion\|LeftDownMotion
231			\|KeyPressed\|ExposeWindow\|ExposeRegion);
232			XMapWindow(wind);
233			return;
234			memerr:
235			quiterr("out of memory");
236			}
237
238
239			quiterr(err) /* print message and exit */
240			char *err;
241			{
242			if (err != NULL)
243			fprintf(stderr, "%s: %s\n", progname, err);
244
245			exit(err == NULL ? 0 : 1);
246			}
247
248
249			eputs(s)
250			char *s;
251			{
252			fputs(s, stderr);
253			}
254
255
256			quit(code)
257			int code;
258			{
259			exit(code);
260			}
261
262
263	greg	1.2	getras() /* get raster file */
264			{
265			colormap ourmap;
266
267			ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
268			if (ourras == NULL)
269			goto memerr;
270			ourras->width = xmax;
271			ourras->height = ymax;
272			if (maxcolors <= 2) { /* monochrome */
273			ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
274			if (ourras->data.m == NULL)
275			goto memerr;
276			getmono();
277			} else {
278			ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
279			if (ourras->data.bz == NULL)
280			goto memerr;
281			if (greyscale)
282			biq(dither,maxcolors,1,ourmap);
283			else
284			ciq(dither,maxcolors,1,ourmap);
285			if (init_rcolors(ourras, ourmap) == 0)
286			goto memerr;
287			}
288			return;
289			memerr:
290	greg	1.26	quiterr("out of memory");
291	greg	1.2	}
292
293
294	greg	1.1	getevent() /* process the next event */
295			{
296			WindowInfo info;
297			XEvent e;
298
299			XNextEvent(&e);
300			switch (e.type) {
301			case KeyPressed:
302			docom(&e);
303			break;
304			case ExposeWindow:
305			XQueryWindow(wind, &info); /* in case resized */
306			width = info.width;
307			height = info.height;
308			/* fall through */
309			case ExposeRegion:
310			fixwindow(&e);
311			break;
312			case UnmapWindow:
313	greg	1.2	unmap_rcolors(ourras);
314	greg	1.1	break;
315			case ButtonPressed:
316			if (controlshift(&e))
317			moveimage(&e);
318			else
319			getbox(&e);
320			break;
321			}
322			}
323
324
325			fixwindow(eexp) /* fix new or stepped-on window */
326			XExposeEvent *eexp;
327			{
328			redraw(eexp->x, eexp->y, eexp->width, eexp->height);
329			}
330
331
332			redraw(x, y, w, h) /* redraw section of window */
333			int x, y;
334			int w, h;
335			{
336	greg	1.7	if (ourras->ncolors && map_rcolors(ourras) == NULL) {
337	greg	1.2	fprintf(stderr, "%s: cannot allocate colors\n", progname);
338			return(-1);
339			}
340	greg	1.1	if (fast)
341	greg	1.2	make_rpixmap(ourras);
342			return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
343	greg	1.1	}
344
345
346			docom(ekey) /* execute command */
347			XKeyEvent *ekey;
348			{
349			char buf[80];
350			COLOR cval;
351	greg	1.15	Color cvx;
352	greg	1.1	char *cp;
353			int n;
354	greg	1.2	double comp;
355	greg	1.1	FVECT rorg, rdir;
356
357			cp = XLookupMapping(ekey, &n);
358			if (n == 0)
359			return(0);
360			switch (cp) { / interpret command */
361			case 'q':
362	greg	1.15	case CTRL(D): /* quit */
363	greg	1.1	quit(0);
364			case '\n':
365			case '\r':
366			case 'l':
367			case 'c': /* value */
368			if (avgbox(cval) == -1)
369			return(-1);
370			switch (*cp) {
371			case '\n':
372			case '\r': /* radiance */
373	greg	1.17	sprintf(buf, "%.3f", intens(cval)/exposure);
374	greg	1.1	break;
375			case 'l': /* luminance */
376	greg	1.17	sprintf(buf, "%.0fn", bright(cval)*683.0/exposure);
377	greg	1.1	break;
378			case 'c': /* color */
379	greg	1.2	comp = pow(2.0, (double)scale);
380	greg	1.1	sprintf(buf, "(%.2f,%.2f,%.2f)",
381	greg	1.2	colval(cval,RED)*comp,
382			colval(cval,GRN)*comp,
383			colval(cval,BLU)*comp);
384	greg	1.1	break;
385			}
386			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
387			fontid, BlackPixel, WhitePixel);
388			return(0);
389	greg	1.15	case 'i': /* identify (contour) */
390	greg	1.16	if (ourras->pixels == NULL)
391	greg	1.15	return(-1);
392			n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
393			n = ourras->pmap[n];
394			cvx.pixel = ourras->cdefs[n].pixel;
395			cvx.red = random() & 65535;
396			cvx.green = random() & 65535;
397			cvx.blue = random() & 65535;
398			XStoreColor(&cvx);
399			return(0);
400	greg	1.1	case 'p': /* position */
401			sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
402			XText(wind, ekey->x, ekey->y, buf, strlen(buf),
403			fontid, BlackPixel, WhitePixel);
404			return(0);
405			case 't': /* trace */
406			if (!gotview) {
407			XFeep(0);
408			return(-1);
409			}
410	greg	1.25	if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
411			(ymax-1-ekey->y+yoff+.5)/ymax) < 0)
412			return(-1);
413	greg	1.1	printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
414			printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
415			fflush(stdout);
416			return(0);
417	greg	1.2	case '=': /* adjust exposure */
418			if (avgbox(cval) == -1)
419			return(-1);
420			n = log(.5/bright(cval))/.69315 - scale; /* truncate */
421	greg	1.5	if (n == 0)
422	greg	1.2	return(0);
423			scale_rcolors(ourras, pow(2.0, (double)n));
424			scale += n;
425			sprintf(buf, "%+d", scale);
426			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
427			fontid, BlackPixel, WhitePixel);
428			XFlush();
429			free_raster(ourras);
430			getras();
431	greg	1.3	/* fall through */
432	greg	1.1	case CTRL(R): /* redraw */
433	greg	1.6	case CTRL(L):
434	greg	1.16	unmap_rcolors(ourras);
435	greg	1.1	XClear(wind);
436			return(redraw(0, 0, width, height));
437			case ' ': /* clear */
438			return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
439			default:
440			XFeep(0);
441			return(-1);
442			}
443			}
444
445
446			moveimage(ep) /* shift the image */
447			XButtonEvent *ep;
448			{
449			XButtonEvent eb;
450
451			XMaskEvent(ButtonReleased, &eb);
452			xoff += eb.x - ep->x;
453			yoff += eb.y - ep->y;
454			XClear(wind);
455			return(redraw(0, 0, width, height));
456			}
457
458
459			getbox(ebut) /* get new box */
460			XButtonEvent *ebut;
461			{
462			union {
463			XEvent e;
464			XButtonEvent b;
465			XMouseMovedEvent m;
466			} e;
467
468			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
469			while (e.e.type == MouseMoved) {
470			revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
471			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
472			revbox(ebut->x, ebut->y, box.xmin, box.ymin);
473			}
474			box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
475			box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
476			if (box.xmin > ebut->x) {
477			box.xsiz = box.xmin - ebut->x + 1;
478			box.xmin = ebut->x;
479			} else {
480			box.xsiz = ebut->x - box.xmin + 1;
481			}
482			if (box.ymin > ebut->y) {
483			box.ysiz = box.ymin - ebut->y + 1;
484			box.ymin = ebut->y;
485			} else {
486			box.ysiz = ebut->y - box.ymin + 1;
487			}
488			}
489
490
491			revbox(x0, y0, x1, y1) /* draw box with reversed lines */
492			int x0, y0, x1, y1;
493			{
494			XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
495			XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
496			XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
497			XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
498			}
499
500
501			avgbox(clr) /* average color over current box */
502			COLOR clr;
503			{
504			int left, right, top, bottom;
505			int y;
506			double d;
507			COLOR ctmp;
508			register int x;
509
510			setcolor(clr, 0.0, 0.0, 0.0);
511			left = box.xmin - xoff;
512			right = left + box.xsiz;
513			if (left < 0)
514			left = 0;
515			if (right > xmax)
516			right = xmax;
517			if (left >= right)
518			return(-1);
519			top = box.ymin - yoff;
520			bottom = top + box.ysiz;
521			if (top < 0)
522			top = 0;
523			if (bottom > ymax)
524			bottom = ymax;
525			if (top >= bottom)
526			return(-1);
527			for (y = top; y < bottom; y++) {
528			if (getscan(y) == -1)
529			return(-1);
530			for (x = left; x < right; x++) {
531			colr_color(ctmp, scanline[x]);
532			addcolor(clr, ctmp);
533			}
534			}
535			d = 1.0/((right-left)*(bottom-top));
536			scalecolor(clr, d);
537			return(0);
538			}
539
540
541			getmono() /* get monochrome data */
542			{
543			register unsigned short *dp;
544			register int x, err;
545			int y;
546	greg	1.24	rgbpixel *inl;
547	greg	1.1	short *cerr;
548
549	greg	1.24	if ((inl = (rgbpixel )malloc(xmaxsizeof(rgbpixel))) == NULL
550	greg	1.1	\|\| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
551	greg	1.26	quiterr("out of memory in getmono");
552	greg	1.2	dp = ourras->data.m - 1;
553	greg	1.1	for (y = 0; y < ymax; y++) {
554	greg	1.24	picreadline3(y, inl);
555	greg	1.1	err = 0;
556			for (x = 0; x < xmax; x++) {
557			if (!(x&0xf))
558			*++dp = 0;
559	greg	1.24	err += rgb_bright(&inl[x]) + cerr[x];
560	greg	1.1	if (err > 127)
561			err -= 255;
562			else
563			*dp \|= 1<<(x&0xf);
564			cerr[x] = err >>= 1;
565			}
566			}
567	greg	1.24	free((char *)inl);
568	greg	1.1	free((char *)cerr);
569			}
570
571
572	greg	1.2	init_rcolors(xr, cmap) /* (re)assign color values */
573	greg	1.1	register XRASTER *xr;
574			colormap cmap;
575			{
576			register int i;
577			register unsigned char *p;
578
579			xr->pmap = (int )malloc(256sizeof(int));
580			if (xr->pmap == NULL)
581			return(0);
582			xr->cdefs = (Color )malloc(256sizeof(Color));
583			if (xr->cdefs == NULL)
584			return(0);
585			for (i = 0; i < 256; i++)
586			xr->pmap[i] = -1;
587			xr->ncolors = 0;
588			for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
589			if (xr->pmap[*p] == -1) {
590			xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
591			xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
592			xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
593			xr->cdefs[xr->ncolors].pixel = *p;
594			xr->pmap[*p] = xr->ncolors++;
595			}
596			xr->cdefs = (Color )realloc((char )xr->cdefs, xr->ncolors*sizeof(Color));
597			if (xr->cdefs == NULL)
598			return(0);
599			return(1);
600			}
601
602
603	greg	1.2	scale_rcolors(xr, sf) /* scale color map */
604			register XRASTER *xr;
605			double sf;
606			{
607			register int i;
608	greg	1.16	long maxv;
609	greg	1.2
610	greg	1.16	if (xr->pixels == NULL)
611			return;
612
613	greg	1.2	sf = pow(sf, 1.0/gamcor);
614	greg	1.16	maxv = 65535/sf;
615	greg	1.2
616			for (i = xr->ncolors; i--; ) {
617	greg	1.16	xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
618			65535 :
619	greg	1.2	xr->cdefs[i].red * sf;
620	greg	1.16	xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
621			65535 :
622	greg	1.2	xr->cdefs[i].green * sf;
623	greg	1.16	xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
624			65535 :
625	greg	1.2	xr->cdefs[i].blue * sf;
626			}
627	greg	1.16	XStoreColors(xr->ncolors, xr->cdefs);
628	greg	1.2	}
629
630
631	greg	1.1	getscan(y)
632			int y;
633			{
634			if (y != cury) {
635			if (scanpos == NULL \|\| scanpos[y] == -1)
636			return(-1);
637			if (fseek(fin, scanpos[y], 0) == -1)
638	greg	1.26	quiterr("fseek error");
639	greg	1.1	cury = y;
640			} else if (scanpos != NULL)
641			scanpos[y] = ftell(fin);
642
643			if (freadcolrs(scanline, xmax, fin) < 0)
644			quiterr("read error");
645
646			cury++;
647			return(0);
648			}
649
650
651			picreadline3(y, l3) /* read in 3-byte scanline */
652			int y;
653			register rgbpixel *l3;
654			{
655	greg	1.12	register int i;
656			/* read scanline */
657	greg	1.1	if (getscan(y) < 0)
658			quiterr("cannot seek for picreadline");
659			/* convert scanline */
660	greg	1.23	normcolrs(scanline, xmax, scale);
661	greg	1.12	for (i = 0; i < xmax; i++) {
662			l3[i].r = scanline[i][RED];
663			l3[i].g = scanline[i][GRN];
664			l3[i].b = scanline[i][BLU];
665	greg	1.1	}
666			}
667
668
669			picwriteline(y, l) /* add 8-bit scanline to image */
670			int y;
671			pixel *l;
672			{
673	greg	1.22	bcopy((char )l, (char )ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1));
674	greg	1.1	}
675
676
677	greg	1.8	picreadcm(map) /* do gamma correction */
678	greg	1.1	colormap map;
679			{
680			extern double pow();
681			register int i, val;
682
683			for (i = 0; i < 256; i++) {
684	greg	1.27	val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
685	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
686			}
687			}
688
689
690			picwritecm(map) /* handled elsewhere */
691			colormap map;
692			{
693	greg	1.2	#ifdef DEBUG
694			register int i;
695
696			for (i = 0; i < 256; i++)
697			printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
698			#endif
699	greg	1.1	}