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  "resolu.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  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, errp;
        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;
                        errp = err;
                        err += rgb_bright(&inl[x]) + cerr[x];
                        if (err > 127)
                                err -= 255;
                        else
                                *dp |= 1<<(x&0xf);
                        err /= 3;
                        cerr[x] = err + errp;
                }
        }
        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:	2.3
Committed:	Mon Dec 23 23:20:06 1991 UTC (32 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+4 -4 lines
Log Message:	fixed CTRL(c) for ANSII preprocessors
#	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	greg	2.1	#include "resolu.h"
27
28	greg	1.1	#include "xraster.h"
29
30			#include "view.h"
31
32			#include "pic.h"
33
34	greg	1.15	#include "random.h"
35
36	greg	1.1	#define controlshift(e) (((XButtonEvent *)(e))->detail & (ShiftMask\|ControlMask))
37
38			#define FONTNAME "9x15" /* text font we'll use */
39
40	greg	2.3	#define CTRL(c) ((c)-'@')
41	greg	1.1
42			#define BORWIDTH 5 /* border width */
43			#define BARHEIGHT 25 /* menu bar size */
44
45	greg	1.11	double gamcor = 2.2; /* gamma correction */
46	greg	1.1
47	greg	1.2	XRASTER ourras = NULL; / our stored raster image */
48	greg	1.1
49			int dither = 1; /* dither colors? */
50			int fast = 0; /* keep picture in Pixmap? */
51
52			Window wind = 0; /* our output window */
53			Font fontid; /* our font */
54
55			int maxcolors = 0; /* maximum colors */
56			int greyscale = 0; /* in grey */
57
58	greg	1.2	int scale = 0; /* scalefactor; power of two */
59
60	greg	1.1	int xoff = 0; /* x image offset */
61			int yoff = 0; /* y image offset */
62
63	greg	1.21	VIEW ourview = STDVIEW; /* image view parameters */
64	greg	1.1	int gotview = 0; /* got parameters from file */
65
66			COLR scanline; / scan line buffer */
67
68			int xmax, ymax; /* picture resolution */
69			int width, height; /* window size */
70			char fname = NULL; / input file name */
71			FILE fin = stdin; / input file */
72			long scanpos = NULL; / scan line positions in file */
73			int cury = 0; /* current scan location */
74
75			double exposure = 1.0; /* exposure compensation used */
76
77	greg	1.29	int wrongformat = 0; /* input in another format */
78
79	greg	1.1	struct {
80			int xmin, ymin, xsiz, ysiz;
81			} box = {0, 0, 0, 0}; /* current box */
82
83			char geometry = NULL; / geometry specification */
84
85			char *progname;
86
87			char errmsg[128];
88
89			extern long ftell();
90
91			extern char malloc(), calloc();
92
93	greg	2.2	extern double pow(), log();
94	greg	1.1
95
96			main(argc, argv)
97			int argc;
98			char *argv[];
99			{
100			int headline();
101			int i;
102
103			progname = argv[0];
104
105			for (i = 1; i < argc; i++)
106			if (argv[i][0] == '-')
107			switch (argv[i][1]) {
108			case 'c':
109			maxcolors = atoi(argv[++i]);
110			break;
111			case 'b':
112			greyscale = !greyscale;
113			break;
114			case 'm':
115			maxcolors = 2;
116			break;
117			case 'd':
118			dither = !dither;
119			break;
120			case 'f':
121			fast = !fast;
122			break;
123	greg	1.2	case 'e':
124			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
125			goto userr;
126			scale = atoi(argv[++i]);
127			break;
128	greg	1.1	case 'g':
129			gamcor = atof(argv[++i]);
130			break;
131			default:
132			goto userr;
133			}
134			else if (argv[i][0] == '=')
135			geometry = argv[i];
136			else
137			break;
138
139			if (argc-i == 1) {
140			fname = argv[i];
141			fin = fopen(fname, "r");
142			if (fin == NULL) {
143			sprintf(errmsg, "can't open file \"%s\"", fname);
144			quiterr(errmsg);
145			}
146	greg	1.6	}
147	greg	1.1	/* get header */
148	greg	1.29	getheader(fin, headline, NULL);
149	greg	1.1	/* get picture dimensions */
150	greg	1.29	if (wrongformat \|\| fgetresolu(&xmax, &ymax, fin) != (YMAJOR\|YDECR))
151	greg	1.1	quiterr("bad picture size");
152			/* set view parameters */
153	greg	1.21	if (gotview && setview(&ourview) != NULL)
154			gotview = 0;
155	greg	1.1	if ((scanline = (COLR )malloc(xmaxsizeof(COLR))) == NULL)
156			quiterr("out of memory");
157
158			init(); /* get file and open window */
159
160			for ( ; ; )
161			getevent(); /* main loop */
162			userr:
163			fprintf(stderr,
164	greg	1.2	"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
165	greg	1.1	progname);
166			quit(1);
167			}
168
169
170			headline(s) /* get relevant info from header */
171			char *s;
172			{
173	greg	1.4	static char *altname[] = {"rview","rpict",VIEWSTR,NULL};
174	greg	1.1	register char **an;
175	greg	1.29	char fmt[32];
176	greg	1.1
177	greg	1.20	if (isexpos(s))
178			exposure *= exposval(s);
179	greg	1.29	else if (isformat(s)) {
180			formatval(fmt, s);
181			wrongformat = strcmp(fmt, COLRFMT);
182			} else
183	greg	1.1	for (an = altname; *an != NULL; an++)
184			if (!strncmp(an, s, strlen(an))) {
185	greg	1.21	if (sscanview(&ourview, s+strlen(*an)) > 0)
186	greg	1.1	gotview++;
187			return;
188			}
189			}
190
191
192			init() /* get data and open window */
193			{
194			register int i;
195			OpaqueFrame mainframe;
196			char defgeom[32];
197
198			if (fname != NULL) {
199			scanpos = (long )malloc(ymaxsizeof(long));
200			if (scanpos == NULL)
201			goto memerr;
202			for (i = 0; i < ymax; i++)
203			scanpos[i] = -1;
204			}
205			if (XOpenDisplay(NULL) == NULL)
206			quiterr("can't open display; DISPLAY variable set?");
207			#ifdef notdef
208			if (DisplayWidth() - 2*BORWIDTH < xmax \|\|
209			DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
210			quiterr("resolution mismatch");
211			#endif
212			if (maxcolors == 0) { /* get number of available colors */
213			maxcolors = 1<<DisplayPlanes();
214			if (maxcolors > 4) maxcolors -= 2;
215			}
216			/* store image */
217	greg	1.2	getras();
218
219	greg	1.1	mainframe.bdrwidth = BORWIDTH;
220			mainframe.border = WhitePixmap;
221			mainframe.background = BlackPixmap;
222			sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
223			wind = XCreate("Radiance Image", progname, geometry, defgeom,
224			&mainframe, 16, 16);
225			if (wind == 0)
226			quiterr("can't create window");
227			width = mainframe.width;
228			height = mainframe.height;
229			fontid = XGetFont(FONTNAME);
230			if (fontid == 0)
231			quiterr("can't get font");
232			XStoreName(wind, fname == NULL ? progname : fname);
233			XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
234			bcross_bits, bcross_mask_bits,
235			bcross_x_hot, bcross_y_hot,
236			BlackPixel, WhitePixel, GXcopy));
237			XSelectInput(wind, ButtonPressed\|ButtonReleased\|UnmapWindow
238			\|RightDownMotion\|MiddleDownMotion\|LeftDownMotion
239			\|KeyPressed\|ExposeWindow\|ExposeRegion);
240			XMapWindow(wind);
241			return;
242			memerr:
243			quiterr("out of memory");
244			}
245
246
247			quiterr(err) /* print message and exit */
248			char *err;
249			{
250			if (err != NULL)
251			fprintf(stderr, "%s: %s\n", progname, err);
252
253			exit(err == NULL ? 0 : 1);
254			}
255
256
257			eputs(s)
258			char *s;
259			{
260			fputs(s, stderr);
261			}
262
263
264			quit(code)
265			int code;
266			{
267			exit(code);
268			}
269
270
271	greg	1.2	getras() /* get raster file */
272			{
273			colormap ourmap;
274
275			ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
276			if (ourras == NULL)
277			goto memerr;
278			ourras->width = xmax;
279			ourras->height = ymax;
280			if (maxcolors <= 2) { /* monochrome */
281			ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
282			if (ourras->data.m == NULL)
283			goto memerr;
284			getmono();
285			} else {
286			ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
287			if (ourras->data.bz == NULL)
288			goto memerr;
289			if (greyscale)
290			biq(dither,maxcolors,1,ourmap);
291			else
292			ciq(dither,maxcolors,1,ourmap);
293			if (init_rcolors(ourras, ourmap) == 0)
294			goto memerr;
295			}
296			return;
297			memerr:
298	greg	1.26	quiterr("out of memory");
299	greg	1.2	}
300
301
302	greg	1.1	getevent() /* process the next event */
303			{
304			WindowInfo info;
305			XEvent e;
306
307			XNextEvent(&e);
308			switch (e.type) {
309			case KeyPressed:
310			docom(&e);
311			break;
312			case ExposeWindow:
313			XQueryWindow(wind, &info); /* in case resized */
314			width = info.width;
315			height = info.height;
316			/* fall through */
317			case ExposeRegion:
318			fixwindow(&e);
319			break;
320			case UnmapWindow:
321	greg	1.2	unmap_rcolors(ourras);
322	greg	1.1	break;
323			case ButtonPressed:
324			if (controlshift(&e))
325			moveimage(&e);
326			else
327			getbox(&e);
328			break;
329			}
330			}
331
332
333			fixwindow(eexp) /* fix new or stepped-on window */
334			XExposeEvent *eexp;
335			{
336			redraw(eexp->x, eexp->y, eexp->width, eexp->height);
337			}
338
339
340			redraw(x, y, w, h) /* redraw section of window */
341			int x, y;
342			int w, h;
343			{
344	greg	1.7	if (ourras->ncolors && map_rcolors(ourras) == NULL) {
345	greg	1.2	fprintf(stderr, "%s: cannot allocate colors\n", progname);
346			return(-1);
347			}
348	greg	1.1	if (fast)
349	greg	1.2	make_rpixmap(ourras);
350			return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
351	greg	1.1	}
352
353
354			docom(ekey) /* execute command */
355			XKeyEvent *ekey;
356			{
357			char buf[80];
358			COLOR cval;
359	greg	1.15	Color cvx;
360	greg	1.1	char *cp;
361			int n;
362	greg	1.2	double comp;
363	greg	1.1	FVECT rorg, rdir;
364
365			cp = XLookupMapping(ekey, &n);
366			if (n == 0)
367			return(0);
368			switch (cp) { / interpret command */
369			case 'q':
370	greg	2.3	case CTRL('D'): /* quit */
371	greg	1.1	quit(0);
372			case '\n':
373			case '\r':
374			case 'l':
375			case 'c': /* value */
376			if (avgbox(cval) == -1)
377			return(-1);
378			switch (*cp) {
379			case '\n':
380			case '\r': /* radiance */
381	greg	1.17	sprintf(buf, "%.3f", intens(cval)/exposure);
382	greg	1.1	break;
383			case 'l': /* luminance */
384	greg	1.30	sprintf(buf, "%.0fL", luminance(cval)/exposure);
385	greg	1.1	break;
386			case 'c': /* color */
387	greg	1.2	comp = pow(2.0, (double)scale);
388	greg	1.1	sprintf(buf, "(%.2f,%.2f,%.2f)",
389	greg	1.2	colval(cval,RED)*comp,
390			colval(cval,GRN)*comp,
391			colval(cval,BLU)*comp);
392	greg	1.1	break;
393			}
394			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
395			fontid, BlackPixel, WhitePixel);
396			return(0);
397	greg	1.15	case 'i': /* identify (contour) */
398	greg	1.16	if (ourras->pixels == NULL)
399	greg	1.15	return(-1);
400			n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
401			n = ourras->pmap[n];
402			cvx.pixel = ourras->cdefs[n].pixel;
403			cvx.red = random() & 65535;
404			cvx.green = random() & 65535;
405			cvx.blue = random() & 65535;
406			XStoreColor(&cvx);
407			return(0);
408	greg	1.1	case 'p': /* position */
409			sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
410			XText(wind, ekey->x, ekey->y, buf, strlen(buf),
411			fontid, BlackPixel, WhitePixel);
412			return(0);
413			case 't': /* trace */
414			if (!gotview) {
415			XFeep(0);
416			return(-1);
417			}
418	greg	1.25	if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
419			(ymax-1-ekey->y+yoff+.5)/ymax) < 0)
420			return(-1);
421	greg	1.1	printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
422			printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
423			fflush(stdout);
424			return(0);
425	greg	1.2	case '=': /* adjust exposure */
426			if (avgbox(cval) == -1)
427			return(-1);
428			n = log(.5/bright(cval))/.69315 - scale; /* truncate */
429	greg	1.5	if (n == 0)
430	greg	1.2	return(0);
431			scale_rcolors(ourras, pow(2.0, (double)n));
432			scale += n;
433			sprintf(buf, "%+d", scale);
434			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
435			fontid, BlackPixel, WhitePixel);
436			XFlush();
437			free_raster(ourras);
438			getras();
439	greg	1.3	/* fall through */
440	greg	2.3	case CTRL('R'): /* redraw */
441			case CTRL('L'):
442	greg	1.16	unmap_rcolors(ourras);
443	greg	1.1	XClear(wind);
444			return(redraw(0, 0, width, height));
445			case ' ': /* clear */
446			return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
447			default:
448			XFeep(0);
449			return(-1);
450			}
451			}
452
453
454			moveimage(ep) /* shift the image */
455			XButtonEvent *ep;
456			{
457			XButtonEvent eb;
458
459			XMaskEvent(ButtonReleased, &eb);
460			xoff += eb.x - ep->x;
461			yoff += eb.y - ep->y;
462			XClear(wind);
463			return(redraw(0, 0, width, height));
464			}
465
466
467			getbox(ebut) /* get new box */
468			XButtonEvent *ebut;
469			{
470			union {
471			XEvent e;
472			XButtonEvent b;
473			XMouseMovedEvent m;
474			} e;
475
476			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
477			while (e.e.type == MouseMoved) {
478			revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
479			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
480			revbox(ebut->x, ebut->y, box.xmin, box.ymin);
481			}
482			box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
483			box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
484			if (box.xmin > ebut->x) {
485			box.xsiz = box.xmin - ebut->x + 1;
486			box.xmin = ebut->x;
487			} else {
488			box.xsiz = ebut->x - box.xmin + 1;
489			}
490			if (box.ymin > ebut->y) {
491			box.ysiz = box.ymin - ebut->y + 1;
492			box.ymin = ebut->y;
493			} else {
494			box.ysiz = ebut->y - box.ymin + 1;
495			}
496			}
497
498
499			revbox(x0, y0, x1, y1) /* draw box with reversed lines */
500			int x0, y0, x1, y1;
501			{
502			XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
503			XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
504			XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
505			XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
506			}
507
508
509			avgbox(clr) /* average color over current box */
510			COLOR clr;
511			{
512			int left, right, top, bottom;
513			int y;
514			double d;
515			COLOR ctmp;
516			register int x;
517
518			setcolor(clr, 0.0, 0.0, 0.0);
519			left = box.xmin - xoff;
520			right = left + box.xsiz;
521			if (left < 0)
522			left = 0;
523			if (right > xmax)
524			right = xmax;
525			if (left >= right)
526			return(-1);
527			top = box.ymin - yoff;
528			bottom = top + box.ysiz;
529			if (top < 0)
530			top = 0;
531			if (bottom > ymax)
532			bottom = ymax;
533			if (top >= bottom)
534			return(-1);
535			for (y = top; y < bottom; y++) {
536			if (getscan(y) == -1)
537			return(-1);
538			for (x = left; x < right; x++) {
539			colr_color(ctmp, scanline[x]);
540			addcolor(clr, ctmp);
541			}
542			}
543			d = 1.0/((right-left)*(bottom-top));
544			scalecolor(clr, d);
545			return(0);
546			}
547
548
549			getmono() /* get monochrome data */
550			{
551			register unsigned short *dp;
552			register int x, err;
553	greg	1.31	int y, errp;
554	greg	1.24	rgbpixel *inl;
555	greg	1.1	short *cerr;
556
557	greg	1.24	if ((inl = (rgbpixel )malloc(xmaxsizeof(rgbpixel))) == NULL
558	greg	1.1	\|\| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
559	greg	1.26	quiterr("out of memory in getmono");
560	greg	1.2	dp = ourras->data.m - 1;
561	greg	1.1	for (y = 0; y < ymax; y++) {
562	greg	1.24	picreadline3(y, inl);
563	greg	1.1	err = 0;
564			for (x = 0; x < xmax; x++) {
565			if (!(x&0xf))
566			*++dp = 0;
567	greg	1.31	errp = err;
568	greg	1.24	err += rgb_bright(&inl[x]) + cerr[x];
569	greg	1.1	if (err > 127)
570			err -= 255;
571			else
572			*dp \|= 1<<(x&0xf);
573	greg	1.31	err /= 3;
574			cerr[x] = err + errp;
575	greg	1.1	}
576			}
577	greg	1.24	free((char *)inl);
578	greg	1.1	free((char *)cerr);
579			}
580
581
582	greg	1.2	init_rcolors(xr, cmap) /* (re)assign color values */
583	greg	1.1	register XRASTER *xr;
584			colormap cmap;
585			{
586			register int i;
587			register unsigned char *p;
588
589			xr->pmap = (int )malloc(256sizeof(int));
590			if (xr->pmap == NULL)
591			return(0);
592			xr->cdefs = (Color )malloc(256sizeof(Color));
593			if (xr->cdefs == NULL)
594			return(0);
595			for (i = 0; i < 256; i++)
596			xr->pmap[i] = -1;
597			xr->ncolors = 0;
598			for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
599			if (xr->pmap[*p] == -1) {
600			xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
601			xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
602			xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
603			xr->cdefs[xr->ncolors].pixel = *p;
604			xr->pmap[*p] = xr->ncolors++;
605			}
606			xr->cdefs = (Color )realloc((char )xr->cdefs, xr->ncolors*sizeof(Color));
607			if (xr->cdefs == NULL)
608			return(0);
609			return(1);
610			}
611
612
613	greg	1.2	scale_rcolors(xr, sf) /* scale color map */
614			register XRASTER *xr;
615			double sf;
616			{
617			register int i;
618	greg	1.16	long maxv;
619	greg	1.2
620	greg	1.16	if (xr->pixels == NULL)
621			return;
622
623	greg	1.2	sf = pow(sf, 1.0/gamcor);
624	greg	1.16	maxv = 65535/sf;
625	greg	1.2
626			for (i = xr->ncolors; i--; ) {
627	greg	1.16	xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
628			65535 :
629	greg	1.2	xr->cdefs[i].red * sf;
630	greg	1.16	xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
631			65535 :
632	greg	1.2	xr->cdefs[i].green * sf;
633	greg	1.16	xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
634			65535 :
635	greg	1.2	xr->cdefs[i].blue * sf;
636			}
637	greg	1.16	XStoreColors(xr->ncolors, xr->cdefs);
638	greg	1.2	}
639
640
641	greg	1.1	getscan(y)
642			int y;
643			{
644			if (y != cury) {
645			if (scanpos == NULL \|\| scanpos[y] == -1)
646			return(-1);
647			if (fseek(fin, scanpos[y], 0) == -1)
648	greg	1.26	quiterr("fseek error");
649	greg	1.1	cury = y;
650			} else if (scanpos != NULL)
651			scanpos[y] = ftell(fin);
652
653			if (freadcolrs(scanline, xmax, fin) < 0)
654			quiterr("read error");
655
656			cury++;
657			return(0);
658			}
659
660
661			picreadline3(y, l3) /* read in 3-byte scanline */
662			int y;
663			register rgbpixel *l3;
664			{
665	greg	1.12	register int i;
666			/* read scanline */
667	greg	1.1	if (getscan(y) < 0)
668			quiterr("cannot seek for picreadline");
669			/* convert scanline */
670	greg	1.23	normcolrs(scanline, xmax, scale);
671	greg	1.12	for (i = 0; i < xmax; i++) {
672			l3[i].r = scanline[i][RED];
673			l3[i].g = scanline[i][GRN];
674			l3[i].b = scanline[i][BLU];
675	greg	1.1	}
676			}
677
678
679			picwriteline(y, l) /* add 8-bit scanline to image */
680			int y;
681			pixel *l;
682			{
683	greg	1.22	bcopy((char )l, (char )ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1));
684	greg	1.1	}
685
686
687	greg	1.8	picreadcm(map) /* do gamma correction */
688	greg	1.1	colormap map;
689			{
690			extern double pow();
691			register int i, val;
692
693			for (i = 0; i < 256; i++) {
694	greg	1.27	val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
695	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
696			}
697			}
698
699
700			picwritecm(map) /* handled elsewhere */
701			colormap map;
702			{
703	greg	1.2	#ifdef DEBUG
704			register int i;
705
706			for (i = 0; i < 256; i++)
707			printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
708			#endif
709	greg	1.1	}