src/px/ximage.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#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  <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;
{
        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:	2.10
Committed:	Wed Apr 23 00:52:34 2003 UTC (21 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.9:	+1 -1 lines
Log Message:	Added (void *) cast to realloc calls
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.9	static const char RCSid[] = "$Id$";
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
19			#include <ctype.h>
20
21	greg	2.9	#include <time.h>
22
23	greg	1.1	#include "color.h"
24
25	greg	2.1	#include "resolu.h"
26
27	greg	1.1	#include "xraster.h"
28
29			#include "view.h"
30
31			#include "pic.h"
32
33	greg	1.15	#include "random.h"
34
35	greg	1.1	#define controlshift(e) (((XButtonEvent *)(e))->detail & (ShiftMask\|ControlMask))
36
37			#define FONTNAME "9x15" /* text font we'll use */
38
39	greg	2.3	#define CTRL(c) ((c)-'@')
40	greg	1.1
41			#define BORWIDTH 5 /* border width */
42			#define BARHEIGHT 25 /* menu bar size */
43
44	greg	1.11	double gamcor = 2.2; /* gamma correction */
45	greg	1.1
46	greg	1.2	XRASTER ourras = NULL; / our stored raster image */
47	greg	1.1
48			int dither = 1; /* dither colors? */
49			int fast = 0; /* keep picture in Pixmap? */
50
51			Window wind = 0; /* our output window */
52			Font fontid; /* our font */
53
54			int maxcolors = 0; /* maximum colors */
55			int greyscale = 0; /* in grey */
56
57	greg	1.2	int scale = 0; /* scalefactor; power of two */
58
59	greg	1.1	int xoff = 0; /* x image offset */
60			int yoff = 0; /* y image offset */
61
62	greg	1.21	VIEW ourview = STDVIEW; /* image view parameters */
63	greg	1.1	int gotview = 0; /* got parameters from file */
64
65			COLR scanline; / scan line buffer */
66
67			int xmax, ymax; /* picture resolution */
68			int width, height; /* window size */
69			char fname = NULL; / input file name */
70			FILE fin = stdin; / input file */
71			long scanpos = NULL; / scan line positions in file */
72			int cury = 0; /* current scan location */
73
74			double exposure = 1.0; /* exposure compensation used */
75
76	greg	1.29	int wrongformat = 0; /* input in another format */
77
78	greg	1.1	struct {
79			int xmin, ymin, xsiz, ysiz;
80			} box = {0, 0, 0, 0}; /* current box */
81
82			char geometry = NULL; / geometry specification */
83
84			char *progname;
85
86			char errmsg[128];
87
88
89			main(argc, argv)
90			int argc;
91			char *argv[];
92			{
93	greg	2.5	extern char *getenv();
94			char *gv;
95	greg	1.1	int headline();
96			int i;
97
98			progname = argv[0];
99	greg	2.7	if ((gv = getenv("DISPLAY_GAMMA")) != NULL)
100	greg	2.5	gamcor = atof(gv);
101	greg	1.1
102			for (i = 1; i < argc; i++)
103			if (argv[i][0] == '-')
104			switch (argv[i][1]) {
105			case 'c':
106			maxcolors = atoi(argv[++i]);
107			break;
108			case 'b':
109			greyscale = !greyscale;
110			break;
111			case 'm':
112			maxcolors = 2;
113			break;
114			case 'd':
115			dither = !dither;
116			break;
117			case 'f':
118			fast = !fast;
119			break;
120	greg	1.2	case 'e':
121			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
122			goto userr;
123			scale = atoi(argv[++i]);
124			break;
125	greg	1.1	case 'g':
126			gamcor = atof(argv[++i]);
127			break;
128			default:
129			goto userr;
130			}
131			else if (argv[i][0] == '=')
132			geometry = argv[i];
133			else
134			break;
135
136			if (argc-i == 1) {
137			fname = argv[i];
138			fin = fopen(fname, "r");
139			if (fin == NULL) {
140			sprintf(errmsg, "can't open file \"%s\"", fname);
141			quiterr(errmsg);
142			}
143	greg	1.6	}
144	greg	1.1	/* get header */
145	greg	1.29	getheader(fin, headline, NULL);
146	greg	1.1	/* get picture dimensions */
147	greg	1.29	if (wrongformat \|\| fgetresolu(&xmax, &ymax, fin) != (YMAJOR\|YDECR))
148	greg	1.1	quiterr("bad picture size");
149			/* set view parameters */
150	greg	1.21	if (gotview && setview(&ourview) != NULL)
151			gotview = 0;
152	greg	1.1	if ((scanline = (COLR )malloc(xmaxsizeof(COLR))) == NULL)
153			quiterr("out of memory");
154
155			init(); /* get file and open window */
156
157			for ( ; ; )
158			getevent(); /* main loop */
159			userr:
160			fprintf(stderr,
161	greg	1.2	"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
162	greg	1.1	progname);
163			quit(1);
164			}
165
166
167	gwlarson	2.8	int
168	greg	1.1	headline(s) /* get relevant info from header */
169			char *s;
170			{
171	greg	1.29	char fmt[32];
172	greg	1.1
173	greg	1.20	if (isexpos(s))
174			exposure *= exposval(s);
175	greg	1.29	else if (isformat(s)) {
176			formatval(fmt, s);
177			wrongformat = strcmp(fmt, COLRFMT);
178	greg	2.4	} else if (isview(s) && sscanview(&ourview, s) > 0)
179			gotview++;
180	gwlarson	2.8	return(0);
181	greg	1.1	}
182
183
184			init() /* get data and open window */
185			{
186			register int i;
187			OpaqueFrame mainframe;
188			char defgeom[32];
189
190			if (fname != NULL) {
191			scanpos = (long )malloc(ymaxsizeof(long));
192			if (scanpos == NULL)
193			goto memerr;
194			for (i = 0; i < ymax; i++)
195			scanpos[i] = -1;
196			}
197			if (XOpenDisplay(NULL) == NULL)
198			quiterr("can't open display; DISPLAY variable set?");
199			#ifdef notdef
200			if (DisplayWidth() - 2*BORWIDTH < xmax \|\|
201			DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax)
202			quiterr("resolution mismatch");
203			#endif
204			if (maxcolors == 0) { /* get number of available colors */
205			maxcolors = 1<<DisplayPlanes();
206			if (maxcolors > 4) maxcolors -= 2;
207			}
208			/* store image */
209	greg	1.2	getras();
210
211	greg	1.1	mainframe.bdrwidth = BORWIDTH;
212			mainframe.border = WhitePixmap;
213			mainframe.background = BlackPixmap;
214			sprintf(defgeom, "=%dx%d+0+22", xmax, ymax);
215			wind = XCreate("Radiance Image", progname, geometry, defgeom,
216			&mainframe, 16, 16);
217			if (wind == 0)
218			quiterr("can't create window");
219			width = mainframe.width;
220			height = mainframe.height;
221			fontid = XGetFont(FONTNAME);
222			if (fontid == 0)
223			quiterr("can't get font");
224			XStoreName(wind, fname == NULL ? progname : fname);
225			XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height,
226			bcross_bits, bcross_mask_bits,
227			bcross_x_hot, bcross_y_hot,
228			BlackPixel, WhitePixel, GXcopy));
229			XSelectInput(wind, ButtonPressed\|ButtonReleased\|UnmapWindow
230			\|RightDownMotion\|MiddleDownMotion\|LeftDownMotion
231			\|KeyPressed\|ExposeWindow\|ExposeRegion);
232			XMapWindow(wind);
233			return;
234			memerr:
235			quiterr("out of memory");
236			}
237
238
239			quiterr(err) /* print message and exit */
240			char *err;
241			{
242			if (err != NULL)
243			fprintf(stderr, "%s: %s\n", progname, err);
244
245			exit(err == NULL ? 0 : 1);
246			}
247
248
249	greg	2.9	void
250	greg	1.1	eputs(s)
251			char *s;
252			{
253			fputs(s, stderr);
254			}
255
256
257	greg	2.9	void
258	greg	1.1	quit(code)
259			int code;
260			{
261			exit(code);
262			}
263
264
265	greg	1.2	getras() /* get raster file */
266			{
267			colormap ourmap;
268
269			ourras = (XRASTER *)calloc(1, sizeof(XRASTER));
270			if (ourras == NULL)
271			goto memerr;
272			ourras->width = xmax;
273			ourras->height = ymax;
274			if (maxcolors <= 2) { /* monochrome */
275			ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax));
276			if (ourras->data.m == NULL)
277			goto memerr;
278			getmono();
279			} else {
280			ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax));
281			if (ourras->data.bz == NULL)
282			goto memerr;
283			if (greyscale)
284			biq(dither,maxcolors,1,ourmap);
285			else
286			ciq(dither,maxcolors,1,ourmap);
287			if (init_rcolors(ourras, ourmap) == 0)
288			goto memerr;
289			}
290			return;
291			memerr:
292	greg	1.26	quiterr("out of memory");
293	greg	1.2	}
294
295
296	greg	1.1	getevent() /* process the next event */
297			{
298			WindowInfo info;
299			XEvent e;
300
301			XNextEvent(&e);
302			switch (e.type) {
303			case KeyPressed:
304			docom(&e);
305			break;
306			case ExposeWindow:
307			XQueryWindow(wind, &info); /* in case resized */
308			width = info.width;
309			height = info.height;
310			/* fall through */
311			case ExposeRegion:
312			fixwindow(&e);
313			break;
314			case UnmapWindow:
315	greg	1.2	unmap_rcolors(ourras);
316	greg	1.1	break;
317			case ButtonPressed:
318			if (controlshift(&e))
319			moveimage(&e);
320			else
321			getbox(&e);
322			break;
323			}
324			}
325
326
327			fixwindow(eexp) /* fix new or stepped-on window */
328			XExposeEvent *eexp;
329			{
330			redraw(eexp->x, eexp->y, eexp->width, eexp->height);
331			}
332
333
334			redraw(x, y, w, h) /* redraw section of window */
335			int x, y;
336			int w, h;
337			{
338	greg	1.7	if (ourras->ncolors && map_rcolors(ourras) == NULL) {
339	greg	1.2	fprintf(stderr, "%s: cannot allocate colors\n", progname);
340			return(-1);
341			}
342	greg	1.1	if (fast)
343	greg	1.2	make_rpixmap(ourras);
344			return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1);
345	greg	1.1	}
346
347
348			docom(ekey) /* execute command */
349			XKeyEvent *ekey;
350			{
351			char buf[80];
352			COLOR cval;
353	greg	1.15	Color cvx;
354	greg	1.1	char *cp;
355			int n;
356	greg	1.2	double comp;
357	greg	1.1	FVECT rorg, rdir;
358
359			cp = XLookupMapping(ekey, &n);
360			if (n == 0)
361			return(0);
362			switch (cp) { / interpret command */
363			case 'q':
364	greg	2.3	case CTRL('D'): /* quit */
365	greg	1.1	quit(0);
366			case '\n':
367			case '\r':
368			case 'l':
369			case 'c': /* value */
370			if (avgbox(cval) == -1)
371			return(-1);
372			switch (*cp) {
373			case '\n':
374			case '\r': /* radiance */
375	greg	1.17	sprintf(buf, "%.3f", intens(cval)/exposure);
376	greg	1.1	break;
377			case 'l': /* luminance */
378	greg	1.30	sprintf(buf, "%.0fL", luminance(cval)/exposure);
379	greg	1.1	break;
380			case 'c': /* color */
381	greg	1.2	comp = pow(2.0, (double)scale);
382	greg	1.1	sprintf(buf, "(%.2f,%.2f,%.2f)",
383	greg	1.2	colval(cval,RED)*comp,
384			colval(cval,GRN)*comp,
385			colval(cval,BLU)*comp);
386	greg	1.1	break;
387			}
388			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
389			fontid, BlackPixel, WhitePixel);
390			return(0);
391	greg	1.15	case 'i': /* identify (contour) */
392	greg	1.16	if (ourras->pixels == NULL)
393	greg	1.15	return(-1);
394			n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)];
395			n = ourras->pmap[n];
396			cvx.pixel = ourras->cdefs[n].pixel;
397			cvx.red = random() & 65535;
398			cvx.green = random() & 65535;
399			cvx.blue = random() & 65535;
400			XStoreColor(&cvx);
401			return(0);
402	greg	1.1	case 'p': /* position */
403			sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff);
404			XText(wind, ekey->x, ekey->y, buf, strlen(buf),
405			fontid, BlackPixel, WhitePixel);
406			return(0);
407			case 't': /* trace */
408			if (!gotview) {
409			XFeep(0);
410			return(-1);
411			}
412	greg	1.25	if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax,
413			(ymax-1-ekey->y+yoff+.5)/ymax) < 0)
414			return(-1);
415	greg	1.1	printf("%e %e %e ", rorg[0], rorg[1], rorg[2]);
416			printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]);
417			fflush(stdout);
418			return(0);
419	greg	1.2	case '=': /* adjust exposure */
420			if (avgbox(cval) == -1)
421			return(-1);
422			n = log(.5/bright(cval))/.69315 - scale; /* truncate */
423	greg	1.5	if (n == 0)
424	greg	1.2	return(0);
425			scale_rcolors(ourras, pow(2.0, (double)n));
426			scale += n;
427			sprintf(buf, "%+d", scale);
428			XText(wind, box.xmin, box.ymin, buf, strlen(buf),
429			fontid, BlackPixel, WhitePixel);
430			XFlush();
431			free_raster(ourras);
432			getras();
433	greg	1.3	/* fall through */
434	greg	2.3	case CTRL('R'): /* redraw */
435			case CTRL('L'):
436	greg	1.16	unmap_rcolors(ourras);
437	greg	1.1	XClear(wind);
438			return(redraw(0, 0, width, height));
439			case ' ': /* clear */
440			return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz));
441			default:
442			XFeep(0);
443			return(-1);
444			}
445			}
446
447
448			moveimage(ep) /* shift the image */
449			XButtonEvent *ep;
450			{
451			XButtonEvent eb;
452
453			XMaskEvent(ButtonReleased, &eb);
454			xoff += eb.x - ep->x;
455			yoff += eb.y - ep->y;
456			XClear(wind);
457			return(redraw(0, 0, width, height));
458			}
459
460
461			getbox(ebut) /* get new box */
462			XButtonEvent *ebut;
463			{
464			union {
465			XEvent e;
466			XButtonEvent b;
467			XMouseMovedEvent m;
468			} e;
469
470			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
471			while (e.e.type == MouseMoved) {
472			revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
473			XMaskEvent(ButtonReleased\|MouseMoved, &e.e);
474			revbox(ebut->x, ebut->y, box.xmin, box.ymin);
475			}
476			box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x);
477			box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y);
478			if (box.xmin > ebut->x) {
479			box.xsiz = box.xmin - ebut->x + 1;
480			box.xmin = ebut->x;
481			} else {
482			box.xsiz = ebut->x - box.xmin + 1;
483			}
484			if (box.ymin > ebut->y) {
485			box.ysiz = box.ymin - ebut->y + 1;
486			box.ymin = ebut->y;
487			} else {
488			box.ysiz = ebut->y - box.ymin + 1;
489			}
490			}
491
492
493			revbox(x0, y0, x1, y1) /* draw box with reversed lines */
494			int x0, y0, x1, y1;
495			{
496			XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes);
497			XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
498			XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes);
499			XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes);
500			}
501
502
503			avgbox(clr) /* average color over current box */
504			COLOR clr;
505			{
506			int left, right, top, bottom;
507			int y;
508			double d;
509			COLOR ctmp;
510			register int x;
511
512			setcolor(clr, 0.0, 0.0, 0.0);
513			left = box.xmin - xoff;
514			right = left + box.xsiz;
515			if (left < 0)
516			left = 0;
517			if (right > xmax)
518			right = xmax;
519			if (left >= right)
520			return(-1);
521			top = box.ymin - yoff;
522			bottom = top + box.ysiz;
523			if (top < 0)
524			top = 0;
525			if (bottom > ymax)
526			bottom = ymax;
527			if (top >= bottom)
528			return(-1);
529			for (y = top; y < bottom; y++) {
530			if (getscan(y) == -1)
531			return(-1);
532			for (x = left; x < right; x++) {
533			colr_color(ctmp, scanline[x]);
534			addcolor(clr, ctmp);
535			}
536			}
537			d = 1.0/((right-left)*(bottom-top));
538			scalecolor(clr, d);
539			return(0);
540			}
541
542
543			getmono() /* get monochrome data */
544			{
545			register unsigned short *dp;
546			register int x, err;
547	greg	1.31	int y, errp;
548	greg	1.24	rgbpixel *inl;
549	greg	1.1	short *cerr;
550
551	greg	1.24	if ((inl = (rgbpixel )malloc(xmaxsizeof(rgbpixel))) == NULL
552	greg	1.1	\|\| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
553	greg	1.26	quiterr("out of memory in getmono");
554	greg	1.2	dp = ourras->data.m - 1;
555	greg	1.1	for (y = 0; y < ymax; y++) {
556	greg	1.24	picreadline3(y, inl);
557	greg	1.1	err = 0;
558			for (x = 0; x < xmax; x++) {
559			if (!(x&0xf))
560			*++dp = 0;
561	greg	1.31	errp = err;
562	greg	1.24	err += rgb_bright(&inl[x]) + cerr[x];
563	greg	1.1	if (err > 127)
564			err -= 255;
565			else
566			*dp \|= 1<<(x&0xf);
567	greg	1.31	err /= 3;
568			cerr[x] = err + errp;
569	greg	1.1	}
570			}
571	greg	2.9	free((void *)inl);
572			free((void *)cerr);
573	greg	1.1	}
574
575
576	greg	1.2	init_rcolors(xr, cmap) /* (re)assign color values */
577	greg	1.1	register XRASTER *xr;
578			colormap cmap;
579			{
580			register int i;
581			register unsigned char *p;
582
583			xr->pmap = (int )malloc(256sizeof(int));
584			if (xr->pmap == NULL)
585			return(0);
586			xr->cdefs = (Color )malloc(256sizeof(Color));
587			if (xr->cdefs == NULL)
588			return(0);
589			for (i = 0; i < 256; i++)
590			xr->pmap[i] = -1;
591			xr->ncolors = 0;
592			for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++)
593			if (xr->pmap[*p] == -1) {
594			xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8;
595			xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8;
596			xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8;
597			xr->cdefs[xr->ncolors].pixel = *p;
598			xr->pmap[*p] = xr->ncolors++;
599			}
600	greg	2.10	xr->cdefs = (Color )realloc((void )xr->cdefs, xr->ncolors*sizeof(Color));
601	greg	1.1	if (xr->cdefs == NULL)
602			return(0);
603			return(1);
604			}
605
606
607	greg	1.2	scale_rcolors(xr, sf) /* scale color map */
608			register XRASTER *xr;
609			double sf;
610			{
611			register int i;
612	greg	1.16	long maxv;
613	greg	1.2
614	greg	1.16	if (xr->pixels == NULL)
615			return;
616
617	greg	1.2	sf = pow(sf, 1.0/gamcor);
618	greg	1.16	maxv = 65535/sf;
619	greg	1.2
620			for (i = xr->ncolors; i--; ) {
621	greg	1.16	xr->cdefs[i].red = xr->cdefs[i].red > maxv ?
622			65535 :
623	greg	1.2	xr->cdefs[i].red * sf;
624	greg	1.16	xr->cdefs[i].green = xr->cdefs[i].green > maxv ?
625			65535 :
626	greg	1.2	xr->cdefs[i].green * sf;
627	greg	1.16	xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ?
628			65535 :
629	greg	1.2	xr->cdefs[i].blue * sf;
630			}
631	greg	1.16	XStoreColors(xr->ncolors, xr->cdefs);
632	greg	1.2	}
633
634
635	greg	1.1	getscan(y)
636			int y;
637			{
638			if (y != cury) {
639			if (scanpos == NULL \|\| scanpos[y] == -1)
640			return(-1);
641			if (fseek(fin, scanpos[y], 0) == -1)
642	greg	1.26	quiterr("fseek error");
643	greg	1.1	cury = y;
644	greg	2.6	} else if (scanpos != NULL && scanpos[y] == -1)
645	greg	1.1	scanpos[y] = ftell(fin);
646
647			if (freadcolrs(scanline, xmax, fin) < 0)
648			quiterr("read error");
649
650			cury++;
651			return(0);
652			}
653
654
655			picreadline3(y, l3) /* read in 3-byte scanline */
656			int y;
657			register rgbpixel *l3;
658			{
659	greg	1.12	register int i;
660			/* read scanline */
661	greg	1.1	if (getscan(y) < 0)
662			quiterr("cannot seek for picreadline");
663			/* convert scanline */
664	greg	1.23	normcolrs(scanline, xmax, scale);
665	greg	1.12	for (i = 0; i < xmax; i++) {
666			l3[i].r = scanline[i][RED];
667			l3[i].g = scanline[i][GRN];
668			l3[i].b = scanline[i][BLU];
669	greg	1.1	}
670			}
671
672
673			picwriteline(y, l) /* add 8-bit scanline to image */
674			int y;
675			pixel *l;
676			{
677	greg	1.22	bcopy((char )l, (char )ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1));
678	greg	1.1	}
679
680
681	greg	1.8	picreadcm(map) /* do gamma correction */
682	greg	1.1	colormap map;
683			{
684			extern double pow();
685			register int i, val;
686
687			for (i = 0; i < 256; i++) {
688	greg	1.27	val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0;
689	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
690			}
691			}
692
693
694			picwritecm(map) /* handled elsewhere */
695			colormap map;
696			{
697	greg	1.2	#ifdef DEBUG
698			register int i;
699
700			for (i = 0; i < 256; i++)
701			printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]);
702			#endif
703	greg	1.1	}