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[];
{
        extern char  *getenv();
        char  *gv;
        int  headline();
        int  i;
        
        progname = argv[0];
        if ((gv = getenv("DISPLAY_GAMMA")) != NULL)
                gamcor = atof(gv);

        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);
}


int
headline(s)             /* get relevant info from header */
char  *s;
{
        char  fmt[32];

        if (isexpos(s))
                exposure *= exposval(s);
        else if (isformat(s)) {
                formatval(fmt, s);
                wrongformat = strcmp(fmt, COLRFMT);
        } else if (isview(s) && sscanview(&ourview, s) > 0)
                gotview++;
        return(0);
}


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] == -1)
                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:	2.8
Committed:	Tue Oct 27 09:08:28 1998 UTC (27 years ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 2.7:	+2 -0 lines
Log Message:	changed getheader() to listen to return value of passed function
#	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	greg	2.5	extern char *getenv();
101			char *gv;
102	greg	1.1	int headline();
103			int i;
104
105			progname = argv[0];
106	greg	2.7	if ((gv = getenv("DISPLAY_GAMMA")) != NULL)
107	greg	2.5	gamcor = atof(gv);
108	greg	1.1
109			for (i = 1; i < argc; i++)
110			if (argv[i][0] == '-')
111			switch (argv[i][1]) {
112			case 'c':
113			maxcolors = atoi(argv[++i]);
114			break;
115			case 'b':
116			greyscale = !greyscale;
117			break;
118			case 'm':
119			maxcolors = 2;
120			break;
121			case 'd':
122			dither = !dither;
123			break;
124			case 'f':
125			fast = !fast;
126			break;
127	greg	1.2	case 'e':
128			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
129			goto userr;
130			scale = atoi(argv[++i]);
131			break;
132	greg	1.1	case 'g':
133			gamcor = atof(argv[++i]);
134			break;
135			default:
136			goto userr;
137			}
138			else if (argv[i][0] == '=')
139			geometry = argv[i];
140			else
141			break;
142
143			if (argc-i == 1) {
144			fname = argv[i];
145			fin = fopen(fname, "r");
146			if (fin == NULL) {
147			sprintf(errmsg, "can't open file \"%s\"", fname);
148			quiterr(errmsg);
149			}
150	greg	1.6	}
151	greg	1.1	/* get header */
152	greg	1.29	getheader(fin, headline, NULL);
153	greg	1.1	/* get picture dimensions */
154	greg	1.29	if (wrongformat \|\| fgetresolu(&xmax, &ymax, fin) != (YMAJOR\|YDECR))
155	greg	1.1	quiterr("bad picture size");
156			/* set view parameters */
157	greg	1.21	if (gotview && setview(&ourview) != NULL)
158			gotview = 0;
159	greg	1.1	if ((scanline = (COLR )malloc(xmaxsizeof(COLR))) == NULL)
160			quiterr("out of memory");
161
162			init(); /* get file and open window */
163
164			for ( ; ; )
165			getevent(); /* main loop */
166			userr:
167			fprintf(stderr,
168	greg	1.2	"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
169	greg	1.1	progname);
170			quit(1);
171			}
172
173
174	gwlarson	2.8	int
175	greg	1.1	headline(s) /* get relevant info from header */
176			char *s;
177			{
178	greg	1.29	char fmt[32];
179	greg	1.1
180	greg	1.20	if (isexpos(s))
181			exposure *= exposval(s);
182	greg	1.29	else if (isformat(s)) {
183			formatval(fmt, s);
184			wrongformat = strcmp(fmt, COLRFMT);
185	greg	2.4	} else if (isview(s) && sscanview(&ourview, s) > 0)
186			gotview++;
187	gwlarson	2.8	return(0);
188	greg	1.1	}
189
190
191			init() /* get data and open window */
192			{
193			register int i;
194			OpaqueFrame mainframe;
195			char defgeom[32];
196
197			if (fname != NULL) {
198			scanpos = (long )malloc(ymaxsizeof(long));
199			if (scanpos == NULL)
200			goto memerr;
201			for (i = 0; i < ymax; i++)
202			scanpos[i] = -1;
203			}
204			if (XOpenDisplay(NULL) == NULL)
205			quiterr("can't open display; DISPLAY variable set?");
206			#ifdef notdef
207			if (DisplayWidth() - 2*BORWIDTH < xmax \|\|
208			DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
209			quiterr("resolution mismatch");
210			#endif
211			if (maxcolors == 0) { /* get number of available colors */
212			maxcolors = 1<<DisplayPlanes();
213			if (maxcolors > 4) maxcolors -= 2;
214			}
215			/* store image */
216	greg	1.2	getras();
217
218	greg	1.1	mainframe.bdrwidth = BORWIDTH;
219			mainframe.border = WhitePixmap;
220			mainframe.background = BlackPixmap;
221			sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
222			wind = XCreate("Radiance Image", progname, geometry, defgeom,
223			&mainframe, 16, 16);
224			if (wind == 0)
225			quiterr("can't create window");
226			width = mainframe.width;
227			height = mainframe.height;
228			fontid = XGetFont(FONTNAME);
229			if (fontid == 0)
230			quiterr("can't get font");
231			XStoreName(wind, fname == NULL ? progname : fname);
232			XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
233			bcross_bits, bcross_mask_bits,
234			bcross_x_hot, bcross_y_hot,
235			BlackPixel, WhitePixel, GXcopy));
236			XSelectInput(wind, ButtonPressed\|ButtonReleased\|UnmapWindow
237			\|RightDownMotion\|MiddleDownMotion\|LeftDownMotion
238			\|KeyPressed\|ExposeWindow\|ExposeRegion);
239			XMapWindow(wind);
240			return;
241			memerr:
242			quiterr("out of memory");
243			}
244
245
246			quiterr(err) /* print message and exit */
247			char *err;
248			{
249			if (err != NULL)
250			fprintf(stderr, "%s: %s\n", progname, err);
251
252			exit(err == NULL ? 0 : 1);
253			}
254
255
256			eputs(s)
257			char *s;
258			{
259			fputs(s, stderr);
260			}
261
262
263			quit(code)
264			int code;
265			{
266			exit(code);
267			}
268
269
270	greg	1.2	getras() /* get raster file */
271			{
272			colormap ourmap;
273
274			ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
275			if (ourras == NULL)
276			goto memerr;
277			ourras->width = xmax;
278			ourras->height = ymax;
279			if (maxcolors <= 2) { /* monochrome */
280			ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
281			if (ourras->data.m == NULL)
282			goto memerr;
283			getmono();
284			} else {
285			ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
286			if (ourras->data.bz == NULL)
287			goto memerr;
288			if (greyscale)
289			biq(dither,maxcolors,1,ourmap);
290			else
291			ciq(dither,maxcolors,1,ourmap);
292			if (init_rcolors(ourras, ourmap) == 0)
293			goto memerr;
294			}
295			return;
296			memerr:
297	greg	1.26	quiterr("out of memory");
298	greg	1.2	}
299
300
301	greg	1.1	getevent() /* process the next event */
302			{
303			WindowInfo info;
304			XEvent e;
305
306			XNextEvent(&e);
307			switch (e.type) {
308			case KeyPressed:
309			docom(&e);
310			break;
311			case ExposeWindow:
312			XQueryWindow(wind, &info); /* in case resized */
313			width = info.width;
314			height = info.height;
315			/* fall through */
316			case ExposeRegion:
317			fixwindow(&e);
318			break;
319			case UnmapWindow:
320	greg	1.2	unmap_rcolors(ourras);
321	greg	1.1	break;
322			case ButtonPressed:
323			if (controlshift(&e))
324			moveimage(&e);
325			else
326			getbox(&e);
327			break;
328			}
329			}
330
331
332			fixwindow(eexp) /* fix new or stepped-on window */
333			XExposeEvent *eexp;
334			{
335			redraw(eexp->x, eexp->y, eexp->width, eexp->height);
336			}
337
338
339			redraw(x, y, w, h) /* redraw section of window */
340			int x, y;
341			int w, h;
342			{
343	greg	1.7	if (ourras->ncolors && map_rcolors(ourras) == NULL) {
344	greg	1.2	fprintf(stderr, "%s: cannot allocate colors\n", progname);
345			return(-1);
346			}
347	greg	1.1	if (fast)
348	greg	1.2	make_rpixmap(ourras);
349			return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
350	greg	1.1	}
351
352
353			docom(ekey) /* execute command */
354			XKeyEvent *ekey;
355			{
356			char buf[80];
357			COLOR cval;
358	greg	1.15	Color cvx;
359	greg	1.1	char *cp;
360			int n;
361	greg	1.2	double comp;
362	greg	1.1	FVECT rorg, rdir;
363
364			cp = XLookupMapping(ekey, &n);
365			if (n == 0)
366			return(0);
367			switch (cp) { / interpret command */
368			case 'q':
369	greg	2.3	case CTRL('D'): /* quit */
370	greg	1.1	quit(0);
371			case '\n':
372			case '\r':
373			case 'l':
374			case 'c': /* value */
375			if (avgbox(cval) == -1)
376			return(-1);
377			switch (*cp) {
378			case '\n':
379			case '\r': /* radiance */
380	greg	1.17	sprintf(buf, "%.3f", intens(cval)/exposure);
381	greg	1.1	break;
382			case 'l': /* luminance */
383	greg	1.30	sprintf(buf, "%.0fL", luminance(cval)/exposure);
384	greg	1.1	break;
385			case 'c': /* color */
386	greg	1.2	comp = pow(2.0, (double)scale);
387	greg	1.1	sprintf(buf, "(%.2f,%.2f,%.2f)",
388	greg	1.2	colval(cval,RED)*comp,
389			colval(cval,GRN)*comp,
390			colval(cval,BLU)*comp);
391	greg	1.1	break;
392			}
393			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
394			fontid, BlackPixel, WhitePixel);
395			return(0);
396	greg	1.15	case 'i': /* identify (contour) */
397	greg	1.16	if (ourras->pixels == NULL)
398	greg	1.15	return(-1);
399			n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
400			n = ourras->pmap[n];
401			cvx.pixel = ourras->cdefs[n].pixel;
402			cvx.red = random() & 65535;
403			cvx.green = random() & 65535;
404			cvx.blue = random() & 65535;
405			XStoreColor(&cvx);
406			return(0);
407	greg	1.1	case 'p': /* position */
408			sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
409			XText(wind, ekey->x, ekey->y, buf, strlen(buf),
410			fontid, BlackPixel, WhitePixel);
411			return(0);
412			case 't': /* trace */
413			if (!gotview) {
414			XFeep(0);
415			return(-1);
416			}
417	greg	1.25	if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
418			(ymax-1-ekey->y+yoff+.5)/ymax) < 0)
419			return(-1);
420	greg	1.1	printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
421			printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
422			fflush(stdout);
423			return(0);
424	greg	1.2	case '=': /* adjust exposure */
425			if (avgbox(cval) == -1)
426			return(-1);
427			n = log(.5/bright(cval))/.69315 - scale; /* truncate */
428	greg	1.5	if (n == 0)
429	greg	1.2	return(0);
430			scale_rcolors(ourras, pow(2.0, (double)n));
431			scale += n;
432			sprintf(buf, "%+d", scale);
433			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
434			fontid, BlackPixel, WhitePixel);
435			XFlush();
436			free_raster(ourras);
437			getras();
438	greg	1.3	/* fall through */
439	greg	2.3	case CTRL('R'): /* redraw */
440			case CTRL('L'):
441	greg	1.16	unmap_rcolors(ourras);
442	greg	1.1	XClear(wind);
443			return(redraw(0, 0, width, height));
444			case ' ': /* clear */
445			return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
446			default:
447			XFeep(0);
448			return(-1);
449			}
450			}
451
452
453			moveimage(ep) /* shift the image */
454			XButtonEvent *ep;
455			{
456			XButtonEvent eb;
457
458			XMaskEvent(ButtonReleased, &eb);
459			xoff += eb.x - ep->x;
460			yoff += eb.y - ep->y;
461			XClear(wind);
462			return(redraw(0, 0, width, height));
463			}
464
465
466			getbox(ebut) /* get new box */
467			XButtonEvent *ebut;
468			{
469			union {
470			XEvent e;
471			XButtonEvent b;
472			XMouseMovedEvent m;
473			} e;
474
475			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
476			while (e.e.type == MouseMoved) {
477			revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
478			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
479			revbox(ebut->x, ebut->y, box.xmin, box.ymin);
480			}
481			box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
482			box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
483			if (box.xmin > ebut->x) {
484			box.xsiz = box.xmin - ebut->x + 1;
485			box.xmin = ebut->x;
486			} else {
487			box.xsiz = ebut->x - box.xmin + 1;
488			}
489			if (box.ymin > ebut->y) {
490			box.ysiz = box.ymin - ebut->y + 1;
491			box.ymin = ebut->y;
492			} else {
493			box.ysiz = ebut->y - box.ymin + 1;
494			}
495			}
496
497
498			revbox(x0, y0, x1, y1) /* draw box with reversed lines */
499			int x0, y0, x1, y1;
500			{
501			XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
502			XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
503			XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
504			XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
505			}
506
507
508			avgbox(clr) /* average color over current box */
509			COLOR clr;
510			{
511			int left, right, top, bottom;
512			int y;
513			double d;
514			COLOR ctmp;
515			register int x;
516
517			setcolor(clr, 0.0, 0.0, 0.0);
518			left = box.xmin - xoff;
519			right = left + box.xsiz;
520			if (left < 0)
521			left = 0;
522			if (right > xmax)
523			right = xmax;
524			if (left >= right)
525			return(-1);
526			top = box.ymin - yoff;
527			bottom = top + box.ysiz;
528			if (top < 0)
529			top = 0;
530			if (bottom > ymax)
531			bottom = ymax;
532			if (top >= bottom)
533			return(-1);
534			for (y = top; y < bottom; y++) {
535			if (getscan(y) == -1)
536			return(-1);
537			for (x = left; x < right; x++) {
538			colr_color(ctmp, scanline[x]);
539			addcolor(clr, ctmp);
540			}
541			}
542			d = 1.0/((right-left)*(bottom-top));
543			scalecolor(clr, d);
544			return(0);
545			}
546
547
548			getmono() /* get monochrome data */
549			{
550			register unsigned short *dp;
551			register int x, err;
552	greg	1.31	int y, errp;
553	greg	1.24	rgbpixel *inl;
554	greg	1.1	short *cerr;
555
556	greg	1.24	if ((inl = (rgbpixel )malloc(xmaxsizeof(rgbpixel))) == NULL
557	greg	1.1	\|\| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
558	greg	1.26	quiterr("out of memory in getmono");
559	greg	1.2	dp = ourras->data.m - 1;
560	greg	1.1	for (y = 0; y < ymax; y++) {
561	greg	1.24	picreadline3(y, inl);
562	greg	1.1	err = 0;
563			for (x = 0; x < xmax; x++) {
564			if (!(x&0xf))
565			*++dp = 0;
566	greg	1.31	errp = err;
567	greg	1.24	err += rgb_bright(&inl[x]) + cerr[x];
568	greg	1.1	if (err > 127)
569			err -= 255;
570			else
571			*dp \|= 1<<(x&0xf);
572	greg	1.31	err /= 3;
573			cerr[x] = err + errp;
574	greg	1.1	}
575			}
576	greg	1.24	free((char *)inl);
577	greg	1.1	free((char *)cerr);
578			}
579
580
581	greg	1.2	init_rcolors(xr, cmap) /* (re)assign color values */
582	greg	1.1	register XRASTER *xr;
583			colormap cmap;
584			{
585			register int i;
586			register unsigned char *p;
587
588			xr->pmap = (int )malloc(256sizeof(int));
589			if (xr->pmap == NULL)
590			return(0);
591			xr->cdefs = (Color )malloc(256sizeof(Color));
592			if (xr->cdefs == NULL)
593			return(0);
594			for (i = 0; i < 256; i++)
595			xr->pmap[i] = -1;
596			xr->ncolors = 0;
597			for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
598			if (xr->pmap[*p] == -1) {
599			xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
600			xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
601			xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
602			xr->cdefs[xr->ncolors].pixel = *p;
603			xr->pmap[*p] = xr->ncolors++;
604			}
605			xr->cdefs = (Color )realloc((char )xr->cdefs, xr->ncolors*sizeof(Color));
606			if (xr->cdefs == NULL)
607			return(0);
608			return(1);
609			}
610
611
612	greg	1.2	scale_rcolors(xr, sf) /* scale color map */
613			register XRASTER *xr;
614			double sf;
615			{
616			register int i;
617	greg	1.16	long maxv;
618	greg	1.2
619	greg	1.16	if (xr->pixels == NULL)
620			return;
621
622	greg	1.2	sf = pow(sf, 1.0/gamcor);
623	greg	1.16	maxv = 65535/sf;
624	greg	1.2
625			for (i = xr->ncolors; i--; ) {
626	greg	1.16	xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
627			65535 :
628	greg	1.2	xr->cdefs[i].red * sf;
629	greg	1.16	xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
630			65535 :
631	greg	1.2	xr->cdefs[i].green * sf;
632	greg	1.16	xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
633			65535 :
634	greg	1.2	xr->cdefs[i].blue * sf;
635			}
636	greg	1.16	XStoreColors(xr->ncolors, xr->cdefs);
637	greg	1.2	}
638
639
640	greg	1.1	getscan(y)
641			int y;
642			{
643			if (y != cury) {
644			if (scanpos == NULL \|\| scanpos[y] == -1)
645			return(-1);
646			if (fseek(fin, scanpos[y], 0) == -1)
647	greg	1.26	quiterr("fseek error");
648	greg	1.1	cury = y;
649	greg	2.6	} else if (scanpos != NULL && scanpos[y] == -1)
650	greg	1.1	scanpos[y] = ftell(fin);
651
652			if (freadcolrs(scanline, xmax, fin) < 0)
653			quiterr("read error");
654
655			cury++;
656			return(0);
657			}
658
659
660			picreadline3(y, l3) /* read in 3-byte scanline */
661			int y;
662			register rgbpixel *l3;
663			{
664	greg	1.12	register int i;
665			/* read scanline */
666	greg	1.1	if (getscan(y) < 0)
667			quiterr("cannot seek for picreadline");
668			/* convert scanline */
669	greg	1.23	normcolrs(scanline, xmax, scale);
670	greg	1.12	for (i = 0; i < xmax; i++) {
671			l3[i].r = scanline[i][RED];
672			l3[i].g = scanline[i][GRN];
673			l3[i].b = scanline[i][BLU];
674	greg	1.1	}
675			}
676
677
678			picwriteline(y, l) /* add 8-bit scanline to image */
679			int y;
680			pixel *l;
681			{
682	greg	1.22	bcopy((char )l, (char )ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1));
683	greg	1.1	}
684
685
686	greg	1.8	picreadcm(map) /* do gamma correction */
687	greg	1.1	colormap map;
688			{
689			extern double pow();
690			register int i, val;
691
692			for (i = 0; i < 256; i++) {
693	greg	1.27	val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
694	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
695			}
696			}
697
698
699			picwritecm(map) /* handled elsewhere */
700			colormap map;
701			{
702	greg	1.2	#ifdef DEBUG
703			register int i;
704
705			for (i = 0; i < 256; i++)
706			printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
707			#endif
708	greg	1.1	}