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 */

int  wrongformat = 0;                   /* input in another format */

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, NULL);
                                /* get picture dimensions */
        if (wrongformat || 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;
        char  fmt[32];

        if (isexpos(s))
                exposure *= exposval(s);
        else if (isformat(s)) {
                formatval(fmt, s);
                wrongformat = strcmp(fmt, COLRFMT);
        } 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, "%.0fL", luminance(cval)/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:	1.30
Committed:	Wed May 1 12:40:03 1991 UTC (33 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.29:	+1 -1 lines
Log Message:	changed 'n' to 'L' in luminance display
#	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	greg	1.29	int wrongformat = 0; /* input in another format */
76
77	greg	1.1	struct {
78			int xmin, ymin, xsiz, ysiz;
79			} box = {0, 0, 0, 0}; /* current box */
80
81			char geometry = NULL; / geometry specification */
82
83			char *progname;
84
85			char errmsg[128];
86
87			extern long ftell();
88
89			extern char malloc(), calloc();
90
91	greg	1.2	extern double atof(), pow(), log();
92	greg	1.1
93
94			main(argc, argv)
95			int argc;
96			char *argv[];
97			{
98			int headline();
99			int i;
100
101			progname = argv[0];
102
103			for (i = 1; i < argc; i++)
104			if (argv[i][0] == '-')
105			switch (argv[i][1]) {
106			case 'c':
107			maxcolors = atoi(argv[++i]);
108			break;
109			case 'b':
110			greyscale = !greyscale;
111			break;
112			case 'm':
113			maxcolors = 2;
114			break;
115			case 'd':
116			dither = !dither;
117			break;
118			case 'f':
119			fast = !fast;
120			break;
121	greg	1.2	case 'e':
122			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
123			goto userr;
124			scale = atoi(argv[++i]);
125			break;
126	greg	1.1	case 'g':
127			gamcor = atof(argv[++i]);
128			break;
129			default:
130			goto userr;
131			}
132			else if (argv[i][0] == '=')
133			geometry = argv[i];
134			else
135			break;
136
137			if (argc-i == 1) {
138			fname = argv[i];
139			fin = fopen(fname, "r");
140			if (fin == NULL) {
141			sprintf(errmsg, "can't open file \"%s\"", fname);
142			quiterr(errmsg);
143			}
144	greg	1.6	}
145	greg	1.1	/* get header */
146	greg	1.29	getheader(fin, headline, NULL);
147	greg	1.1	/* get picture dimensions */
148	greg	1.29	if (wrongformat \|\| fgetresolu(&xmax, &ymax, fin) != (YMAJOR\|YDECR))
149	greg	1.1	quiterr("bad picture size");
150			/* set view parameters */
151	greg	1.21	if (gotview && setview(&ourview) != NULL)
152			gotview = 0;
153	greg	1.1	if ((scanline = (COLR )malloc(xmaxsizeof(COLR))) == NULL)
154			quiterr("out of memory");
155
156			init(); /* get file and open window */
157
158			for ( ; ; )
159			getevent(); /* main loop */
160			userr:
161			fprintf(stderr,
162	greg	1.2	"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
163	greg	1.1	progname);
164			quit(1);
165			}
166
167
168			headline(s) /* get relevant info from header */
169			char *s;
170			{
171	greg	1.4	static char *altname[] = {"rview","rpict",VIEWSTR,NULL};
172	greg	1.1	register char **an;
173	greg	1.29	char fmt[32];
174	greg	1.1
175	greg	1.20	if (isexpos(s))
176			exposure *= exposval(s);
177	greg	1.29	else if (isformat(s)) {
178			formatval(fmt, s);
179			wrongformat = strcmp(fmt, COLRFMT);
180			} else
181	greg	1.1	for (an = altname; *an != NULL; an++)
182			if (!strncmp(an, s, strlen(an))) {
183	greg	1.21	if (sscanview(&ourview, s+strlen(*an)) > 0)
184	greg	1.1	gotview++;
185			return;
186			}
187			}
188
189
190			init() /* get data and open window */
191			{
192			register int i;
193			OpaqueFrame mainframe;
194			char defgeom[32];
195
196			if (fname != NULL) {
197			scanpos = (long )malloc(ymaxsizeof(long));
198			if (scanpos == NULL)
199			goto memerr;
200			for (i = 0; i < ymax; i++)
201			scanpos[i] = -1;
202			}
203			if (XOpenDisplay(NULL) == NULL)
204			quiterr("can't open display; DISPLAY variable set?");
205			#ifdef notdef
206			if (DisplayWidth() - 2*BORWIDTH < xmax \|\|
207			DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
208			quiterr("resolution mismatch");
209			#endif
210			if (maxcolors == 0) { /* get number of available colors */
211			maxcolors = 1<<DisplayPlanes();
212			if (maxcolors > 4) maxcolors -= 2;
213			}
214			/* store image */
215	greg	1.2	getras();
216
217	greg	1.1	mainframe.bdrwidth = BORWIDTH;
218			mainframe.border = WhitePixmap;
219			mainframe.background = BlackPixmap;
220			sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
221			wind = XCreate("Radiance Image", progname, geometry, defgeom,
222			&mainframe, 16, 16);
223			if (wind == 0)
224			quiterr("can't create window");
225			width = mainframe.width;
226			height = mainframe.height;
227			fontid = XGetFont(FONTNAME);
228			if (fontid == 0)
229			quiterr("can't get font");
230			XStoreName(wind, fname == NULL ? progname : fname);
231			XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
232			bcross_bits, bcross_mask_bits,
233			bcross_x_hot, bcross_y_hot,
234			BlackPixel, WhitePixel, GXcopy));
235			XSelectInput(wind, ButtonPressed\|ButtonReleased\|UnmapWindow
236			\|RightDownMotion\|MiddleDownMotion\|LeftDownMotion
237			\|KeyPressed\|ExposeWindow\|ExposeRegion);
238			XMapWindow(wind);
239			return;
240			memerr:
241			quiterr("out of memory");
242			}
243
244
245			quiterr(err) /* print message and exit */
246			char *err;
247			{
248			if (err != NULL)
249			fprintf(stderr, "%s: %s\n", progname, err);
250
251			exit(err == NULL ? 0 : 1);
252			}
253
254
255			eputs(s)
256			char *s;
257			{
258			fputs(s, stderr);
259			}
260
261
262			quit(code)
263			int code;
264			{
265			exit(code);
266			}
267
268
269	greg	1.2	getras() /* get raster file */
270			{
271			colormap ourmap;
272
273			ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
274			if (ourras == NULL)
275			goto memerr;
276			ourras->width = xmax;
277			ourras->height = ymax;
278			if (maxcolors <= 2) { /* monochrome */
279			ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
280			if (ourras->data.m == NULL)
281			goto memerr;
282			getmono();
283			} else {
284			ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
285			if (ourras->data.bz == NULL)
286			goto memerr;
287			if (greyscale)
288			biq(dither,maxcolors,1,ourmap);
289			else
290			ciq(dither,maxcolors,1,ourmap);
291			if (init_rcolors(ourras, ourmap) == 0)
292			goto memerr;
293			}
294			return;
295			memerr:
296	greg	1.26	quiterr("out of memory");
297	greg	1.2	}
298
299
300	greg	1.1	getevent() /* process the next event */
301			{
302			WindowInfo info;
303			XEvent e;
304
305			XNextEvent(&e);
306			switch (e.type) {
307			case KeyPressed:
308			docom(&e);
309			break;
310			case ExposeWindow:
311			XQueryWindow(wind, &info); /* in case resized */
312			width = info.width;
313			height = info.height;
314			/* fall through */
315			case ExposeRegion:
316			fixwindow(&e);
317			break;
318			case UnmapWindow:
319	greg	1.2	unmap_rcolors(ourras);
320	greg	1.1	break;
321			case ButtonPressed:
322			if (controlshift(&e))
323			moveimage(&e);
324			else
325			getbox(&e);
326			break;
327			}
328			}
329
330
331			fixwindow(eexp) /* fix new or stepped-on window */
332			XExposeEvent *eexp;
333			{
334			redraw(eexp->x, eexp->y, eexp->width, eexp->height);
335			}
336
337
338			redraw(x, y, w, h) /* redraw section of window */
339			int x, y;
340			int w, h;
341			{
342	greg	1.7	if (ourras->ncolors && map_rcolors(ourras) == NULL) {
343	greg	1.2	fprintf(stderr, "%s: cannot allocate colors\n", progname);
344			return(-1);
345			}
346	greg	1.1	if (fast)
347	greg	1.2	make_rpixmap(ourras);
348			return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
349	greg	1.1	}
350
351
352			docom(ekey) /* execute command */
353			XKeyEvent *ekey;
354			{
355			char buf[80];
356			COLOR cval;
357	greg	1.15	Color cvx;
358	greg	1.1	char *cp;
359			int n;
360	greg	1.2	double comp;
361	greg	1.1	FVECT rorg, rdir;
362
363			cp = XLookupMapping(ekey, &n);
364			if (n == 0)
365			return(0);
366			switch (cp) { / interpret command */
367			case 'q':
368	greg	1.15	case CTRL(D): /* quit */
369	greg	1.1	quit(0);
370			case '\n':
371			case '\r':
372			case 'l':
373			case 'c': /* value */
374			if (avgbox(cval) == -1)
375			return(-1);
376			switch (*cp) {
377			case '\n':
378			case '\r': /* radiance */
379	greg	1.17	sprintf(buf, "%.3f", intens(cval)/exposure);
380	greg	1.1	break;
381			case 'l': /* luminance */
382	greg	1.30	sprintf(buf, "%.0fL", luminance(cval)/exposure);
383	greg	1.1	break;
384			case 'c': /* color */
385	greg	1.2	comp = pow(2.0, (double)scale);
386	greg	1.1	sprintf(buf, "(%.2f,%.2f,%.2f)",
387	greg	1.2	colval(cval,RED)*comp,
388			colval(cval,GRN)*comp,
389			colval(cval,BLU)*comp);
390	greg	1.1	break;
391			}
392			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
393			fontid, BlackPixel, WhitePixel);
394			return(0);
395	greg	1.15	case 'i': /* identify (contour) */
396	greg	1.16	if (ourras->pixels == NULL)
397	greg	1.15	return(-1);
398			n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
399			n = ourras->pmap[n];
400			cvx.pixel = ourras->cdefs[n].pixel;
401			cvx.red = random() & 65535;
402			cvx.green = random() & 65535;
403			cvx.blue = random() & 65535;
404			XStoreColor(&cvx);
405			return(0);
406	greg	1.1	case 'p': /* position */
407			sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
408			XText(wind, ekey->x, ekey->y, buf, strlen(buf),
409			fontid, BlackPixel, WhitePixel);
410			return(0);
411			case 't': /* trace */
412			if (!gotview) {
413			XFeep(0);
414			return(-1);
415			}
416	greg	1.25	if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
417			(ymax-1-ekey->y+yoff+.5)/ymax) < 0)
418			return(-1);
419	greg	1.1	printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
420			printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
421			fflush(stdout);
422			return(0);
423	greg	1.2	case '=': /* adjust exposure */
424			if (avgbox(cval) == -1)
425			return(-1);
426			n = log(.5/bright(cval))/.69315 - scale; /* truncate */
427	greg	1.5	if (n == 0)
428	greg	1.2	return(0);
429			scale_rcolors(ourras, pow(2.0, (double)n));
430			scale += n;
431			sprintf(buf, "%+d", scale);
432			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
433			fontid, BlackPixel, WhitePixel);
434			XFlush();
435			free_raster(ourras);
436			getras();
437	greg	1.3	/* fall through */
438	greg	1.1	case CTRL(R): /* redraw */
439	greg	1.6	case CTRL(L):
440	greg	1.16	unmap_rcolors(ourras);
441	greg	1.1	XClear(wind);
442			return(redraw(0, 0, width, height));
443			case ' ': /* clear */
444			return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
445			default:
446			XFeep(0);
447			return(-1);
448			}
449			}
450
451
452			moveimage(ep) /* shift the image */
453			XButtonEvent *ep;
454			{
455			XButtonEvent eb;
456
457			XMaskEvent(ButtonReleased, &eb);
458			xoff += eb.x - ep->x;
459			yoff += eb.y - ep->y;
460			XClear(wind);
461			return(redraw(0, 0, width, height));
462			}
463
464
465			getbox(ebut) /* get new box */
466			XButtonEvent *ebut;
467			{
468			union {
469			XEvent e;
470			XButtonEvent b;
471			XMouseMovedEvent m;
472			} e;
473
474			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
475			while (e.e.type == MouseMoved) {
476			revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
477			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
478			revbox(ebut->x, ebut->y, box.xmin, box.ymin);
479			}
480			box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
481			box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
482			if (box.xmin > ebut->x) {
483			box.xsiz = box.xmin - ebut->x + 1;
484			box.xmin = ebut->x;
485			} else {
486			box.xsiz = ebut->x - box.xmin + 1;
487			}
488			if (box.ymin > ebut->y) {
489			box.ysiz = box.ymin - ebut->y + 1;
490			box.ymin = ebut->y;
491			} else {
492			box.ysiz = ebut->y - box.ymin + 1;
493			}
494			}
495
496
497			revbox(x0, y0, x1, y1) /* draw box with reversed lines */
498			int x0, y0, x1, y1;
499			{
500			XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
501			XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
502			XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
503			XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
504			}
505
506
507			avgbox(clr) /* average color over current box */
508			COLOR clr;
509			{
510			int left, right, top, bottom;
511			int y;
512			double d;
513			COLOR ctmp;
514			register int x;
515
516			setcolor(clr, 0.0, 0.0, 0.0);
517			left = box.xmin - xoff;
518			right = left + box.xsiz;
519			if (left < 0)
520			left = 0;
521			if (right > xmax)
522			right = xmax;
523			if (left >= right)
524			return(-1);
525			top = box.ymin - yoff;
526			bottom = top + box.ysiz;
527			if (top < 0)
528			top = 0;
529			if (bottom > ymax)
530			bottom = ymax;
531			if (top >= bottom)
532			return(-1);
533			for (y = top; y < bottom; y++) {
534			if (getscan(y) == -1)
535			return(-1);
536			for (x = left; x < right; x++) {
537			colr_color(ctmp, scanline[x]);
538			addcolor(clr, ctmp);
539			}
540			}
541			d = 1.0/((right-left)*(bottom-top));
542			scalecolor(clr, d);
543			return(0);
544			}
545
546
547			getmono() /* get monochrome data */
548			{
549			register unsigned short *dp;
550			register int x, err;
551			int y;
552	greg	1.24	rgbpixel *inl;
553	greg	1.1	short *cerr;
554
555	greg	1.24	if ((inl = (rgbpixel )malloc(xmaxsizeof(rgbpixel))) == NULL
556	greg	1.1	\|\| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
557	greg	1.26	quiterr("out of memory in getmono");
558	greg	1.2	dp = ourras->data.m - 1;
559	greg	1.1	for (y = 0; y < ymax; y++) {
560	greg	1.24	picreadline3(y, inl);
561	greg	1.1	err = 0;
562			for (x = 0; x < xmax; x++) {
563			if (!(x&0xf))
564			*++dp = 0;
565	greg	1.24	err += rgb_bright(&inl[x]) + cerr[x];
566	greg	1.1	if (err > 127)
567			err -= 255;
568			else
569			*dp \|= 1<<(x&0xf);
570			cerr[x] = err >>= 1;
571			}
572			}
573	greg	1.24	free((char *)inl);
574	greg	1.1	free((char *)cerr);
575			}
576
577
578	greg	1.2	init_rcolors(xr, cmap) /* (re)assign color values */
579	greg	1.1	register XRASTER *xr;
580			colormap cmap;
581			{
582			register int i;
583			register unsigned char *p;
584
585			xr->pmap = (int )malloc(256sizeof(int));
586			if (xr->pmap == NULL)
587			return(0);
588			xr->cdefs = (Color )malloc(256sizeof(Color));
589			if (xr->cdefs == NULL)
590			return(0);
591			for (i = 0; i < 256; i++)
592			xr->pmap[i] = -1;
593			xr->ncolors = 0;
594			for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
595			if (xr->pmap[*p] == -1) {
596			xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
597			xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
598			xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
599			xr->cdefs[xr->ncolors].pixel = *p;
600			xr->pmap[*p] = xr->ncolors++;
601			}
602			xr->cdefs = (Color )realloc((char )xr->cdefs, xr->ncolors*sizeof(Color));
603			if (xr->cdefs == NULL)
604			return(0);
605			return(1);
606			}
607
608
609	greg	1.2	scale_rcolors(xr, sf) /* scale color map */
610			register XRASTER *xr;
611			double sf;
612			{
613			register int i;
614	greg	1.16	long maxv;
615	greg	1.2
616	greg	1.16	if (xr->pixels == NULL)
617			return;
618
619	greg	1.2	sf = pow(sf, 1.0/gamcor);
620	greg	1.16	maxv = 65535/sf;
621	greg	1.2
622			for (i = xr->ncolors; i--; ) {
623	greg	1.16	xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
624			65535 :
625	greg	1.2	xr->cdefs[i].red * sf;
626	greg	1.16	xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
627			65535 :
628	greg	1.2	xr->cdefs[i].green * sf;
629	greg	1.16	xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
630			65535 :
631	greg	1.2	xr->cdefs[i].blue * sf;
632			}
633	greg	1.16	XStoreColors(xr->ncolors, xr->cdefs);
634	greg	1.2	}
635
636
637	greg	1.1	getscan(y)
638			int y;
639			{
640			if (y != cury) {
641			if (scanpos == NULL \|\| scanpos[y] == -1)
642			return(-1);
643			if (fseek(fin, scanpos[y], 0) == -1)
644	greg	1.26	quiterr("fseek error");
645	greg	1.1	cury = y;
646			} else if (scanpos != NULL)
647			scanpos[y] = ftell(fin);
648
649			if (freadcolrs(scanline, xmax, fin) < 0)
650			quiterr("read error");
651
652			cury++;
653			return(0);
654			}
655
656
657			picreadline3(y, l3) /* read in 3-byte scanline */
658			int y;
659			register rgbpixel *l3;
660			{
661	greg	1.12	register int i;
662			/* read scanline */
663	greg	1.1	if (getscan(y) < 0)
664			quiterr("cannot seek for picreadline");
665			/* convert scanline */
666	greg	1.23	normcolrs(scanline, xmax, scale);
667	greg	1.12	for (i = 0; i < xmax; i++) {
668			l3[i].r = scanline[i][RED];
669			l3[i].g = scanline[i][GRN];
670			l3[i].b = scanline[i][BLU];
671	greg	1.1	}
672			}
673
674
675			picwriteline(y, l) /* add 8-bit scanline to image */
676			int y;
677			pixel *l;
678			{
679	greg	1.22	bcopy((char )l, (char )ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1));
680	greg	1.1	}
681
682
683	greg	1.8	picreadcm(map) /* do gamma correction */
684	greg	1.1	colormap map;
685			{
686			extern double pow();
687			register int i, val;
688
689			for (i = 0; i < 256; i++) {
690	greg	1.27	val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
691	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
692			}
693			}
694
695
696			picwritecm(map) /* handled elsewhere */
697			colormap map;
698			{
699	greg	1.2	#ifdef DEBUG
700			register int i;
701
702			for (i = 0; i < 256; i++)
703			printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
704			#endif
705	greg	1.1	}