src/px/ximage.c

#ifndef lint
static const char       RCSid[] = "$Id: ximage.c,v 2.11 2003/05/13 17:58:33 greg Exp $";
#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  <string.h>
#include  <ctype.h>
#include  <time.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];


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);
}


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


void
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((void *)inl);
        free((void *)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((void *)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;
{
        memcpy((void *)ourras->data.bz+BZPixmapSize(xmax,y), (void *)l, 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:	2.12
Committed:	Mon Jun 30 14:59:12 2003 UTC (20 years, 10 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.11:	+3 -9 lines
Log Message:	Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.12	static const char RCSid[] = "$Id: ximage.c,v 2.11 2003/05/13 17:58:33 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* ximage.c - driver for X-windows
6			*
7			* 4/30/87
8			* 3/3/88 Added calls to xraster & Paul Heckbert's ciq routines
9			*/
10
11			#include "standard.h"
12
13			#include <X/Xlib.h>
14			#include <X/cursors/bcross.cursor>
15			#include <X/cursors/bcross_mask.cursor>
16
17			#include <sys/types.h>
18	schorsch	2.12	#include <string.h>
19	greg	1.1	#include <ctype.h>
20	greg	2.9	#include <time.h>
21
22	greg	1.1	#include "color.h"
23	greg	2.1	#include "resolu.h"
24	greg	1.1	#include "xraster.h"
25			#include "view.h"
26			#include "pic.h"
27	greg	1.15	#include "random.h"
28
29	greg	1.1	#define controlshift(e) (((XButtonEvent *)(e))->detail & (ShiftMask\|ControlMask))
30
31			#define FONTNAME "9x15" /* text font we'll use */
32
33	greg	2.3	#define CTRL(c) ((c)-'@')
34	greg	1.1
35			#define BORWIDTH 5 /* border width */
36			#define BARHEIGHT 25 /* menu bar size */
37
38	greg	1.11	double gamcor = 2.2; /* gamma correction */
39	greg	1.1
40	greg	1.2	XRASTER ourras = NULL; / our stored raster image */
41	greg	1.1
42			int dither = 1; /* dither colors? */
43			int fast = 0; /* keep picture in Pixmap? */
44
45			Window wind = 0; /* our output window */
46			Font fontid; /* our font */
47
48			int maxcolors = 0; /* maximum colors */
49			int greyscale = 0; /* in grey */
50
51	greg	1.2	int scale = 0; /* scalefactor; power of two */
52
53	greg	1.1	int xoff = 0; /* x image offset */
54			int yoff = 0; /* y image offset */
55
56	greg	1.21	VIEW ourview = STDVIEW; /* image view parameters */
57	greg	1.1	int gotview = 0; /* got parameters from file */
58
59			COLR scanline; / scan line buffer */
60
61			int xmax, ymax; /* picture resolution */
62			int width, height; /* window size */
63			char fname = NULL; / input file name */
64			FILE fin = stdin; / input file */
65			long scanpos = NULL; / scan line positions in file */
66			int cury = 0; /* current scan location */
67
68			double exposure = 1.0; /* exposure compensation used */
69
70	greg	1.29	int wrongformat = 0; /* input in another format */
71
72	greg	1.1	struct {
73			int xmin, ymin, xsiz, ysiz;
74			} box = {0, 0, 0, 0}; /* current box */
75
76			char geometry = NULL; / geometry specification */
77
78			char *progname;
79
80			char errmsg[128];
81
82
83			main(argc, argv)
84			int argc;
85			char *argv[];
86			{
87	greg	2.5	extern char *getenv();
88			char *gv;
89	greg	1.1	int headline();
90			int i;
91
92			progname = argv[0];
93	greg	2.7	if ((gv = getenv("DISPLAY_GAMMA")) != NULL)
94	greg	2.5	gamcor = atof(gv);
95	greg	1.1
96			for (i = 1; i < argc; i++)
97			if (argv[i][0] == '-')
98			switch (argv[i][1]) {
99			case 'c':
100			maxcolors = atoi(argv[++i]);
101			break;
102			case 'b':
103			greyscale = !greyscale;
104			break;
105			case 'm':
106			maxcolors = 2;
107			break;
108			case 'd':
109			dither = !dither;
110			break;
111			case 'f':
112			fast = !fast;
113			break;
114	greg	1.2	case 'e':
115			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
116			goto userr;
117			scale = atoi(argv[++i]);
118			break;
119	greg	1.1	case 'g':
120			gamcor = atof(argv[++i]);
121			break;
122			default:
123			goto userr;
124			}
125			else if (argv[i][0] == '=')
126			geometry = argv[i];
127			else
128			break;
129
130			if (argc-i == 1) {
131			fname = argv[i];
132			fin = fopen(fname, "r");
133			if (fin == NULL) {
134			sprintf(errmsg, "can't open file \"%s\"", fname);
135			quiterr(errmsg);
136			}
137	greg	1.6	}
138	greg	1.1	/* get header */
139	greg	1.29	getheader(fin, headline, NULL);
140	greg	1.1	/* get picture dimensions */
141	greg	1.29	if (wrongformat \|\| fgetresolu(&xmax, &ymax, fin) != (YMAJOR\|YDECR))
142	greg	1.1	quiterr("bad picture size");
143			/* set view parameters */
144	greg	1.21	if (gotview && setview(&ourview) != NULL)
145			gotview = 0;
146	greg	1.1	if ((scanline = (COLR )malloc(xmaxsizeof(COLR))) == NULL)
147			quiterr("out of memory");
148
149			init(); /* get file and open window */
150
151			for ( ; ; )
152			getevent(); /* main loop */
153			userr:
154			fprintf(stderr,
155	greg	1.2	"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
156	greg	1.1	progname);
157			quit(1);
158			}
159
160
161	gwlarson	2.8	int
162	greg	1.1	headline(s) /* get relevant info from header */
163			char *s;
164			{
165	greg	1.29	char fmt[32];
166	greg	1.1
167	greg	1.20	if (isexpos(s))
168			exposure *= exposval(s);
169	greg	1.29	else if (isformat(s)) {
170			formatval(fmt, s);
171			wrongformat = strcmp(fmt, COLRFMT);
172	greg	2.4	} else if (isview(s) && sscanview(&ourview, s) > 0)
173			gotview++;
174	gwlarson	2.8	return(0);
175	greg	1.1	}
176
177
178			init() /* get data and open window */
179			{
180			register int i;
181			OpaqueFrame mainframe;
182			char defgeom[32];
183
184			if (fname != NULL) {
185			scanpos = (long )malloc(ymaxsizeof(long));
186			if (scanpos == NULL)
187			goto memerr;
188			for (i = 0; i < ymax; i++)
189			scanpos[i] = -1;
190			}
191			if (XOpenDisplay(NULL) == NULL)
192			quiterr("can't open display; DISPLAY variable set?");
193			#ifdef notdef
194			if (DisplayWidth() - 2*BORWIDTH < xmax \|\|
195			DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
196			quiterr("resolution mismatch");
197			#endif
198			if (maxcolors == 0) { /* get number of available colors */
199			maxcolors = 1<<DisplayPlanes();
200			if (maxcolors > 4) maxcolors -= 2;
201			}
202			/* store image */
203	greg	1.2	getras();
204
205	greg	1.1	mainframe.bdrwidth = BORWIDTH;
206			mainframe.border = WhitePixmap;
207			mainframe.background = BlackPixmap;
208			sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
209			wind = XCreate("Radiance Image", progname, geometry, defgeom,
210			&mainframe, 16, 16);
211			if (wind == 0)
212			quiterr("can't create window");
213			width = mainframe.width;
214			height = mainframe.height;
215			fontid = XGetFont(FONTNAME);
216			if (fontid == 0)
217			quiterr("can't get font");
218			XStoreName(wind, fname == NULL ? progname : fname);
219			XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
220			bcross_bits, bcross_mask_bits,
221			bcross_x_hot, bcross_y_hot,
222			BlackPixel, WhitePixel, GXcopy));
223			XSelectInput(wind, ButtonPressed\|ButtonReleased\|UnmapWindow
224			\|RightDownMotion\|MiddleDownMotion\|LeftDownMotion
225			\|KeyPressed\|ExposeWindow\|ExposeRegion);
226			XMapWindow(wind);
227			return;
228			memerr:
229			quiterr("out of memory");
230			}
231
232
233			quiterr(err) /* print message and exit */
234			char *err;
235			{
236			if (err != NULL)
237			fprintf(stderr, "%s: %s\n", progname, err);
238
239			exit(err == NULL ? 0 : 1);
240			}
241
242
243	greg	2.9	void
244	greg	1.1	eputs(s)
245			char *s;
246			{
247			fputs(s, stderr);
248			}
249
250
251	greg	2.9	void
252	greg	1.1	quit(code)
253			int code;
254			{
255			exit(code);
256			}
257
258
259	greg	1.2	getras() /* get raster file */
260			{
261			colormap ourmap;
262
263			ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
264			if (ourras == NULL)
265			goto memerr;
266			ourras->width = xmax;
267			ourras->height = ymax;
268			if (maxcolors <= 2) { /* monochrome */
269			ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
270			if (ourras->data.m == NULL)
271			goto memerr;
272			getmono();
273			} else {
274			ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
275			if (ourras->data.bz == NULL)
276			goto memerr;
277			if (greyscale)
278			biq(dither,maxcolors,1,ourmap);
279			else
280			ciq(dither,maxcolors,1,ourmap);
281			if (init_rcolors(ourras, ourmap) == 0)
282			goto memerr;
283			}
284			return;
285			memerr:
286	greg	1.26	quiterr("out of memory");
287	greg	1.2	}
288
289
290	greg	1.1	getevent() /* process the next event */
291			{
292			WindowInfo info;
293			XEvent e;
294
295			XNextEvent(&e);
296			switch (e.type) {
297			case KeyPressed:
298			docom(&e);
299			break;
300			case ExposeWindow:
301			XQueryWindow(wind, &info); /* in case resized */
302			width = info.width;
303			height = info.height;
304			/* fall through */
305			case ExposeRegion:
306			fixwindow(&e);
307			break;
308			case UnmapWindow:
309	greg	1.2	unmap_rcolors(ourras);
310	greg	1.1	break;
311			case ButtonPressed:
312			if (controlshift(&e))
313			moveimage(&e);
314			else
315			getbox(&e);
316			break;
317			}
318			}
319
320
321			fixwindow(eexp) /* fix new or stepped-on window */
322			XExposeEvent *eexp;
323			{
324			redraw(eexp->x, eexp->y, eexp->width, eexp->height);
325			}
326
327
328			redraw(x, y, w, h) /* redraw section of window */
329			int x, y;
330			int w, h;
331			{
332	greg	1.7	if (ourras->ncolors && map_rcolors(ourras) == NULL) {
333	greg	1.2	fprintf(stderr, "%s: cannot allocate colors\n", progname);
334			return(-1);
335			}
336	greg	1.1	if (fast)
337	greg	1.2	make_rpixmap(ourras);
338			return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
339	greg	1.1	}
340
341
342			docom(ekey) /* execute command */
343			XKeyEvent *ekey;
344			{
345			char buf[80];
346			COLOR cval;
347	greg	1.15	Color cvx;
348	greg	1.1	char *cp;
349			int n;
350	greg	1.2	double comp;
351	greg	1.1	FVECT rorg, rdir;
352
353			cp = XLookupMapping(ekey, &n);
354			if (n == 0)
355			return(0);
356			switch (cp) { / interpret command */
357			case 'q':
358	greg	2.3	case CTRL('D'): /* quit */
359	greg	1.1	quit(0);
360			case '\n':
361			case '\r':
362			case 'l':
363			case 'c': /* value */
364			if (avgbox(cval) == -1)
365			return(-1);
366			switch (*cp) {
367			case '\n':
368			case '\r': /* radiance */
369	greg	1.17	sprintf(buf, "%.3f", intens(cval)/exposure);
370	greg	1.1	break;
371			case 'l': /* luminance */
372	greg	1.30	sprintf(buf, "%.0fL", luminance(cval)/exposure);
373	greg	1.1	break;
374			case 'c': /* color */
375	greg	1.2	comp = pow(2.0, (double)scale);
376	greg	1.1	sprintf(buf, "(%.2f,%.2f,%.2f)",
377	greg	1.2	colval(cval,RED)*comp,
378			colval(cval,GRN)*comp,
379			colval(cval,BLU)*comp);
380	greg	1.1	break;
381			}
382			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
383			fontid, BlackPixel, WhitePixel);
384			return(0);
385	greg	1.15	case 'i': /* identify (contour) */
386	greg	1.16	if (ourras->pixels == NULL)
387	greg	1.15	return(-1);
388			n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
389			n = ourras->pmap[n];
390			cvx.pixel = ourras->cdefs[n].pixel;
391			cvx.red = random() & 65535;
392			cvx.green = random() & 65535;
393			cvx.blue = random() & 65535;
394			XStoreColor(&cvx);
395			return(0);
396	greg	1.1	case 'p': /* position */
397			sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
398			XText(wind, ekey->x, ekey->y, buf, strlen(buf),
399			fontid, BlackPixel, WhitePixel);
400			return(0);
401			case 't': /* trace */
402			if (!gotview) {
403			XFeep(0);
404			return(-1);
405			}
406	greg	1.25	if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
407			(ymax-1-ekey->y+yoff+.5)/ymax) < 0)
408			return(-1);
409	greg	1.1	printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
410			printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
411			fflush(stdout);
412			return(0);
413	greg	1.2	case '=': /* adjust exposure */
414			if (avgbox(cval) == -1)
415			return(-1);
416			n = log(.5/bright(cval))/.69315 - scale; /* truncate */
417	greg	1.5	if (n == 0)
418	greg	1.2	return(0);
419			scale_rcolors(ourras, pow(2.0, (double)n));
420			scale += n;
421			sprintf(buf, "%+d", scale);
422			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
423			fontid, BlackPixel, WhitePixel);
424			XFlush();
425			free_raster(ourras);
426			getras();
427	greg	1.3	/* fall through */
428	greg	2.3	case CTRL('R'): /* redraw */
429			case CTRL('L'):
430	greg	1.16	unmap_rcolors(ourras);
431	greg	1.1	XClear(wind);
432			return(redraw(0, 0, width, height));
433			case ' ': /* clear */
434			return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
435			default:
436			XFeep(0);
437			return(-1);
438			}
439			}
440
441
442			moveimage(ep) /* shift the image */
443			XButtonEvent *ep;
444			{
445			XButtonEvent eb;
446
447			XMaskEvent(ButtonReleased, &eb);
448			xoff += eb.x - ep->x;
449			yoff += eb.y - ep->y;
450			XClear(wind);
451			return(redraw(0, 0, width, height));
452			}
453
454
455			getbox(ebut) /* get new box */
456			XButtonEvent *ebut;
457			{
458			union {
459			XEvent e;
460			XButtonEvent b;
461			XMouseMovedEvent m;
462			} e;
463
464			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
465			while (e.e.type == MouseMoved) {
466			revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
467			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
468			revbox(ebut->x, ebut->y, box.xmin, box.ymin);
469			}
470			box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
471			box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
472			if (box.xmin > ebut->x) {
473			box.xsiz = box.xmin - ebut->x + 1;
474			box.xmin = ebut->x;
475			} else {
476			box.xsiz = ebut->x - box.xmin + 1;
477			}
478			if (box.ymin > ebut->y) {
479			box.ysiz = box.ymin - ebut->y + 1;
480			box.ymin = ebut->y;
481			} else {
482			box.ysiz = ebut->y - box.ymin + 1;
483			}
484			}
485
486
487			revbox(x0, y0, x1, y1) /* draw box with reversed lines */
488			int x0, y0, x1, y1;
489			{
490			XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
491			XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
492			XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
493			XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
494			}
495
496
497			avgbox(clr) /* average color over current box */
498			COLOR clr;
499			{
500			int left, right, top, bottom;
501			int y;
502			double d;
503			COLOR ctmp;
504			register int x;
505
506			setcolor(clr, 0.0, 0.0, 0.0);
507			left = box.xmin - xoff;
508			right = left + box.xsiz;
509			if (left < 0)
510			left = 0;
511			if (right > xmax)
512			right = xmax;
513			if (left >= right)
514			return(-1);
515			top = box.ymin - yoff;
516			bottom = top + box.ysiz;
517			if (top < 0)
518			top = 0;
519			if (bottom > ymax)
520			bottom = ymax;
521			if (top >= bottom)
522			return(-1);
523			for (y = top; y < bottom; y++) {
524			if (getscan(y) == -1)
525			return(-1);
526			for (x = left; x < right; x++) {
527			colr_color(ctmp, scanline[x]);
528			addcolor(clr, ctmp);
529			}
530			}
531			d = 1.0/((right-left)*(bottom-top));
532			scalecolor(clr, d);
533			return(0);
534			}
535
536
537			getmono() /* get monochrome data */
538			{
539			register unsigned short *dp;
540			register int x, err;
541	greg	1.31	int y, errp;
542	greg	1.24	rgbpixel *inl;
543	greg	1.1	short *cerr;
544
545	greg	1.24	if ((inl = (rgbpixel )malloc(xmaxsizeof(rgbpixel))) == NULL
546	greg	1.1	\|\| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
547	greg	1.26	quiterr("out of memory in getmono");
548	greg	1.2	dp = ourras->data.m - 1;
549	greg	1.1	for (y = 0; y < ymax; y++) {
550	greg	1.24	picreadline3(y, inl);
551	greg	1.1	err = 0;
552			for (x = 0; x < xmax; x++) {
553			if (!(x&0xf))
554			*++dp = 0;
555	greg	1.31	errp = err;
556	greg	1.24	err += rgb_bright(&inl[x]) + cerr[x];
557	greg	1.1	if (err > 127)
558			err -= 255;
559			else
560			*dp \|= 1<<(x&0xf);
561	greg	1.31	err /= 3;
562			cerr[x] = err + errp;
563	greg	1.1	}
564			}
565	greg	2.9	free((void *)inl);
566			free((void *)cerr);
567	greg	1.1	}
568
569
570	greg	1.2	init_rcolors(xr, cmap) /* (re)assign color values */
571	greg	1.1	register XRASTER *xr;
572			colormap cmap;
573			{
574			register int i;
575			register unsigned char *p;
576
577			xr->pmap = (int )malloc(256sizeof(int));
578			if (xr->pmap == NULL)
579			return(0);
580			xr->cdefs = (Color )malloc(256sizeof(Color));
581			if (xr->cdefs == NULL)
582			return(0);
583			for (i = 0; i < 256; i++)
584			xr->pmap[i] = -1;
585			xr->ncolors = 0;
586			for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
587			if (xr->pmap[*p] == -1) {
588			xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
589			xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
590			xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
591			xr->cdefs[xr->ncolors].pixel = *p;
592			xr->pmap[*p] = xr->ncolors++;
593			}
594	greg	2.10	xr->cdefs = (Color )realloc((void )xr->cdefs, xr->ncolors*sizeof(Color));
595	greg	1.1	if (xr->cdefs == NULL)
596			return(0);
597			return(1);
598			}
599
600
601	greg	1.2	scale_rcolors(xr, sf) /* scale color map */
602			register XRASTER *xr;
603			double sf;
604			{
605			register int i;
606	greg	1.16	long maxv;
607	greg	1.2
608	greg	1.16	if (xr->pixels == NULL)
609			return;
610
611	greg	1.2	sf = pow(sf, 1.0/gamcor);
612	greg	1.16	maxv = 65535/sf;
613	greg	1.2
614			for (i = xr->ncolors; i--; ) {
615	greg	1.16	xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
616			65535 :
617	greg	1.2	xr->cdefs[i].red * sf;
618	greg	1.16	xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
619			65535 :
620	greg	1.2	xr->cdefs[i].green * sf;
621	greg	1.16	xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
622			65535 :
623	greg	1.2	xr->cdefs[i].blue * sf;
624			}
625	greg	1.16	XStoreColors(xr->ncolors, xr->cdefs);
626	greg	1.2	}
627
628
629	greg	1.1	getscan(y)
630			int y;
631			{
632			if (y != cury) {
633			if (scanpos == NULL \|\| scanpos[y] == -1)
634			return(-1);
635			if (fseek(fin, scanpos[y], 0) == -1)
636	greg	1.26	quiterr("fseek error");
637	greg	1.1	cury = y;
638	greg	2.6	} else if (scanpos != NULL && scanpos[y] == -1)
639	greg	1.1	scanpos[y] = ftell(fin);
640
641			if (freadcolrs(scanline, xmax, fin) < 0)
642			quiterr("read error");
643
644			cury++;
645			return(0);
646			}
647
648
649			picreadline3(y, l3) /* read in 3-byte scanline */
650			int y;
651			register rgbpixel *l3;
652			{
653	greg	1.12	register int i;
654			/* read scanline */
655	greg	1.1	if (getscan(y) < 0)
656			quiterr("cannot seek for picreadline");
657			/* convert scanline */
658	greg	1.23	normcolrs(scanline, xmax, scale);
659	greg	1.12	for (i = 0; i < xmax; i++) {
660			l3[i].r = scanline[i][RED];
661			l3[i].g = scanline[i][GRN];
662			l3[i].b = scanline[i][BLU];
663	greg	1.1	}
664			}
665
666
667			picwriteline(y, l) /* add 8-bit scanline to image */
668			int y;
669			pixel *l;
670			{
671	schorsch	2.12	memcpy((void )ourras->data.bz+BZPixmapSize(xmax,y), (void )l, BZPixmapSize(xmax,1));
672	greg	1.1	}
673
674
675	greg	1.8	picreadcm(map) /* do gamma correction */
676	greg	1.1	colormap map;
677			{
678			extern double pow();
679			register int i, val;
680
681			for (i = 0; i < 256; i++) {
682	greg	1.27	val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
683	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
684			}
685			}
686
687
688			picwritecm(map) /* handled elsewhere */
689			colormap map;
690			{
691	greg	1.2	#ifdef DEBUG
692			register int i;
693
694			for (i = 0; i < 256; i++)
695			printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
696			#endif
697	greg	1.1	}