src/px/vgaimage.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  vgaimage.c - driver for VGA board under DOS
 */

#include  "standard.h"
#include  <graph.h>
#include  "color.h"
#include  "random.h"
#include  "resolu.h"
#include <dos.h>
#include <i86.h>

#define  M_RDOWN        0x8
#define  M_RUP          0x10
#define  M_LDOWN        0x2
#define  M_LUP          0x4
#define  M_MOTION       0x1

int crad;
int mouse_event = 0;
int mouse_xpos = -1;
int mouse_ypos = -1;

#define  hide_cursor()  move_cursor(-1,-1)
#define  show_cursor()  move_cursor(mouse_xpos,mouse_ypos)

#define  CTRL(c)        ((c)-'@')

#define  MAXWIDTH       1024
#define  MAXHEIGHT      768

short  ourblack = 0; ourwhite = 1;

double  gamcor = 2.2;                   /* gamma correction */

int  dither = 1;                        /* dither colors? */

int  maxcolors = 0;                     /* maximum colors */
int  minpix = 0;                        /* minimum pixel value */
int  greyscale = 0;                     /* in grey */

int  scale = 0;                         /* scalefactor; power of two */

COLR  scanline[MAXWIDTH];               /* scan line buffer */

int  xmax, ymax;                        /* picture dimensions */
FILE  *fin = stdin;                     /* input file */
long  scanpos[MAXHEIGHT];               /* 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 */

int  initialized = 0;
int  cheight, cwidth;

#define postext(x,y)    _settextposition(1+(y)/cheight,1+(x)/cwidth)

char  *progname;

char  errmsg[128];

extern BYTE  clrtab[256][3];            /* global color map */

extern long  ftell();


main(argc, argv)
int  argc;
char  *argv[];
{
        extern char  *getenv(), *fixargv0();
        char  *gv;
        int  headline();
        int  i;

        progname = argv[0] = fixargv0(argv[0]);
        if ((gv = getenv("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 '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
                        break;

        if (i == argc-1) {              /* open picture */
                fin = fopen(argv[i], "r");
                if (fin == NULL) {
                        sprintf(errmsg, "cannot open file \"%s\"", argv[i]);
                        quiterr(errmsg);
                }
        } else if (i != argc)
                goto userr;
        setmode(fileno(fin), O_BINARY);
                                /* get header */
        getheader(fin, headline, NULL);
                                /* get picture dimensions */
        if (wrongformat || fgetresolu(&xmax, &ymax, fin) < 0)
                quiterr("bad picture format");
        if (xmax > MAXWIDTH | ymax > MAXHEIGHT)
                quiterr("input picture too large for VGA");

        init();                 /* initialize and display */

        while (docommand())     /* loop on command */
                ;
        quiterr(NULL);
userr:
        fprintf(stderr,
        "Usage: %s [-b][-m][-d][-c ncolors][-e +/-stops] file\n", progname);
        exit(1);
}


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);
        }
}


init()                  /* initialize and load display */
{
        static struct {
                short   mode;
                short   xsiz, ysiz;
        } video[] = {
                {_MRES256COLOR, 320, 200},
                {_VRES256COLOR, 640, 400},
                {_SVRES256COLOR, 800, 600},
                {_XRES256COLOR, 1024, 768},
                -1
        };
        struct videoconfig      config;
        register int    i;
                                /* pick a card... */
        for (i = 0; video[i].mode != -1; i++)
                if (video[i].xsiz >= xmax && video[i].ysiz >= ymax)
                        break;
        if (video[i].mode == -1)
                quiterr("input picture too large");
        if (_setvideomode(video[i].mode) == 0)
                quiterr("inadequate display card for picture");
        initialized = 1;
        _getvideoconfig(&config);
        if (maxcolors == 0)
                maxcolors = config.numcolors;
        if (maxcolors > 4) {
                maxcolors -= minpix = 2;
                _settextcolor(ourwhite);
        }
        cheight = config.numypixels/config.numtextrows;
        cwidth = config.numxpixels/config.numtextcols;
                                /* clear scan position array */
        for (i = 0; i < ymax; i++)
                scanpos[i] = -1;
                                /* display image */
        if (greyscale)
                greyimage();
        else
                mappedimage();
}


quiterr(err)            /* print message and exit */
char  *err;
{
        if (initialized)
                _setvideomode(_DEFAULTMODE);
        if (err != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        exit(0);
}


int
docommand()                     /* execute command */
{
        char  buf[64];
        COLOR  cval;
        int  com;
        double  comp;

        while (!kbhit())
                watch_mouse();
        com = getch();
        switch (com) {                  /* interpret command */
        case 'q':
        case CTRL('Z'):                         /* quit */
                return(0);
        case '\n':
        case '\r':
        case 'l':
        case 'c':                               /* value */
                if (avgbox(cval) == -1)
                        return(-1);
                switch (com) {
                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;
                }
                postext(box.xmin+box.xsiz/2, box.ymin+box.ysiz/2);
                hide_cursor();
                _outtext(buf);
                show_cursor();
                return(1);
        default:
                return(-1);
        }
}


watch_mouse()                   /* look after mousie */
{
        static int      mouse_installed = 0;
        int     a_x, a_y, l_x, l_y;

        if (!mouse_installed) {
                ms_init();
                mouse_installed = 1;
        }
        if (mouse_event & M_MOTION)
                move_cursor(mouse_xpos, mouse_ypos);
        if (!(mouse_event & M_LDOWN))
                return;
        l_x = a_x = mouse_xpos; l_y = a_y = mouse_ypos;
        hide_cursor();
        revbox(a_x, a_y, l_x, l_y);             /* show box */
        do {
                mouse_event = 0;
                while (!mouse_event)
                        ;
                if (mouse_event & M_MOTION) {
                        revbox(a_x, a_y, l_x, l_y);
                        revbox(a_x, a_y, l_x=mouse_xpos, l_y=mouse_ypos);
                }
        } while (!(mouse_event & M_LUP));
        revbox(a_x, a_y, l_x, l_y);             /* hide box */
        show_cursor();
        box.xmin = mouse_xpos;
        box.ymin = mouse_ypos;
        if (box.xmin > a_x) {
                box.xsiz = box.xmin - a_x + 1;
                box.xmin = a_x;
        } else {
                box.xsiz = a_x - box.xmin + 1;
        }
        if (box.ymin > a_y) {
                box.ysiz = box.ymin - a_y + 1;
                box.ymin = a_y;
        } else {
                box.ysiz = a_y - box.ymin + 1;
        }
        mouse_event = 0;
}


revbox(x0, y0, x1, y1)                  /* draw box with reversed lines */
int  x0, y0, x1, y1;
{
        _setplotaction(_GXOR);
        _setcolor(255);
        _moveto(x0, y0);
        _lineto(x1, y0);
        _lineto(x1, y1);
        _lineto(x0, y1);
        _lineto(x0, y0);
}


int
avgbox(clr)                             /* average color over current box */
COLOR  clr;
{
        static COLOR  lc;
        static int  ll, lr, lt, lb;
        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;
        right = left + box.xsiz;
        if (left < 0)
                left = 0;
        if (right > xmax)
                right = xmax;
        if (left >= right)
                return(-1);
        top = box.ymin;
        bottom = top + box.ysiz;
        if (top < 0)
                top = 0;
        if (bottom > ymax)
                bottom = ymax;
        if (top >= bottom)
                return(-1);
        if (left == ll && right == lr && top == lt && bottom == lb) {
                copycolor(clr, lc);
                return(0);
        }
        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);
        ll = left; lr = right; lt = top; lb = bottom;
        copycolor(lc, clr);
        return(0);
}


setpalette()                    /* set our palette using clrtab */
{
        long    cvals[256];
        register int    i;

        if (minpix >= 2) {
                cvals[ourblack] = _BLACK; cvals[ourwhite] = _BRIGHTWHITE;
        }
        for (i = 0; i < maxcolors; i++)
                cvals[i+minpix] = clrtab[i][BLU]<<14 & 0x3f0000L |
                                  clrtab[i][GRN]<<6 & 0x3f00 |
                                  clrtab[i][RED]>>2;
        _remapallpalette(cvals);
}


greyimage()                     /* display greyscale image */
{
        short   thiscolor, lastcolor = -1;
        int     y;
        register int    x;
                                        /* set gamma correction */
        setcolrgam(gamcor);
                                        /* set up color map */
        for (x = 0; x < maxcolors; x++)
                clrtab[x][RED] = clrtab[x][GRN] =
                        clrtab[x][BLU] = ((long)x*256+maxcolors/2)/maxcolors;
        setpalette();
        _setplotaction(_GPSET);
                                        /* read and display file */
        for (y = 0; y < ymax; y++) {
                getscan(y);
                if (scale)
                        shiftcolrs(scanline, xmax, scale);
                colrs_gambs(scanline, xmax);
                if (maxcolors < 256)
                        for (x = 0; x < xmax; x++) {
                                thiscolor = ((long)normbright(scanline[x]) *
                                        maxcolors + 128) >> 8;
                                if (thiscolor != lastcolor)
                                        _setcolor((lastcolor=thiscolor)+minpix);
                                _setpixel(x, y);
                        }
                else
                        for (x = 0; x < xmax; x++) {
                                thiscolor = normbright(scanline[x]);
                                if (thiscolor != lastcolor)
                                        _setcolor((lastcolor=thiscolor)+minpix);
                                _setpixel(x, y);
                        }
        }
}


mappedimage()                   /* display color-mapped image */
{
        BYTE    bscan[MAXWIDTH];
        int     y;
        register int    x;
                                        /* set gamma correction */
        setcolrgam(gamcor);
                                        /* make histogram */
        new_histo();
        for (y = 0; y < ymax; y++) {
                if (getscan(y) < 0)
                        quiterr("seek error in getmapped");
                if (scale)
                        shiftcolrs(scanline, xmax, scale);
                colrs_gambs(scanline, xmax);
                cnt_colrs(scanline, xmax);
        }
                                        /* map pixels */
        if (!new_clrtab(maxcolors))
                quiterr("cannot create color map");
        setpalette();
        _setplotaction(_GPSET);
                                        /* display image */
        for (y = 0; y < ymax; y++) {
                if (getscan(y) < 0)
                        quiterr("seek error in getmapped");
                if (scale)
                        shiftcolrs(scanline, xmax, scale);
                colrs_gambs(scanline, xmax);
                if (dither)
                        dith_colrs(bscan, scanline, xmax);
                else
                        map_colrs(bscan, scanline, xmax);
                for (x = 0; x < xmax; x++) {
                        if (x==0 || bscan[x] != bscan[x-1])
                                _setcolor(bscan[x]+minpix);
                        _setpixel(x, y);
                }
        }
}


getscan(y)
int  y;
{
        if (y != cury) {
                if (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("picture read error");

        cury++;
        return(0);
}


/*
 * Microsoft Mouse handling routines
 */


#pragma off (check_stack)
void _loadds far mouse_handler (int max, int mcx, int mdx)
{
#pragma aux mouse_handler parm [EAX] [ECX] [EDX]
        mouse_event = max;
        mouse_xpos = mcx;
        mouse_ypos = mdx;
}
#pragma on (check_stack)


void
move_cursor(newx, newy)         /* move cursor to new position */
int  newx, newy;
{
        static char  *imp = NULL;
        static int  curx = -1, cury = -1;
#define xcmin           (curx-crad<0 ? 0 : curx-crad)
#define ycmin           (cury-crad<0 ? 0 : cury-crad)
#define xcmax           (curx+crad>=xmax ? xmax-1 : curx+crad)
#define ycmax           (cury+crad>=ymax ? ymax-1 : cury+crad)

        if (newx == curx & newy == cury)
                return;
        if (imp == NULL &&
                (imp = bmalloc(_imagesize(0,0,2*crad+1,2*crad+1))) == NULL) {
                quiterr("out of memory in move_cursor");
        }
        if (curx >= 0 & cury >= 0)      /* clear old cursor */
                _putimage(xcmin, ycmin, imp, _GPSET);
                                        /* record new position */
        curx = newx; cury = newy;
        if (curx < 0 | cury < 0)
                return;         /* no cursor */
                                        /* save under new cursor */
        _getimage(xcmin, ycmin, xcmax, ycmax, imp);
                                        /* draw new cursor */
        _setplotaction(_GPSET);
        _setcolor(ourwhite);
        _rectangle(_GFILLINTERIOR, xcmin, cury-1, xcmax, cury+1);
        _rectangle(_GFILLINTERIOR, curx-1, ycmin, curx+1, ycmax);
        _setcolor(ourblack);
        _moveto(xcmin+1, cury);
        _lineto(xcmax-1, cury);
        _moveto(curx, ycmin+1);
        _lineto(curx, ycmax-1);
#undef xcmin
#undef ycmin
#undef xcmax
#undef ycmax
}


int
ms_init()
{
    struct SREGS sregs;
    union REGS inregs, outregs;
    int far *ptr;
    int (far *function_ptr)();

    segread(&sregs);

    /* check for mouse driver */

    inregs.w.ax = 0;
    int386 (0x33, &inregs, &outregs);
    if( outregs.w.ax != -1 ) {
        return(0);
    }

    crad = ymax/40;

    /* set screen limits */

    inregs.w.ax = 0x7;          /* horizontal resolution */
    inregs.w.cx = 0;
    inregs.w.dx = xmax-1;
    int386x( 0x33, &inregs, &outregs, &sregs );
    inregs.w.ax = 0x8;          /* vertical resolution */
    inregs.w.cx = 0;
    inregs.w.dx = ymax-1;
    int386x( 0x33, &inregs, &outregs, &sregs );

    /* install watcher */

    inregs.w.ax = 0xC;
    inregs.w.cx = M_LDOWN | M_LUP | M_MOTION;
    function_ptr = mouse_handler;
    inregs.x.edx = FP_OFF( function_ptr );
    sregs.es     = FP_SEG( function_ptr );
    int386x( 0x33, &inregs, &outregs, &sregs );

    return(1);
}
Revision:	2.3
Committed:	Fri Oct 16 13:09:36 1992 UTC (31 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+89 -80 lines
Log Message:	Changes for 32-bit PC port
#	User	Rev	Content
1	greg	2.1	/* Copyright (c) 1992 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* vgaimage.c - driver for VGA board under DOS
9			*/
10
11			#include "standard.h"
12			#include <graph.h>
13			#include "color.h"
14			#include "random.h"
15			#include "resolu.h"
16			#include <dos.h>
17			#include <i86.h>
18
19	greg	2.3	#define M_RDOWN 0x8
20			#define M_RUP 0x10
21			#define M_LDOWN 0x2
22			#define M_LUP 0x4
23			#define M_MOTION 0x1
24	greg	2.1
25			int crad;
26			int mouse_event = 0;
27			int mouse_xpos = -1;
28			int mouse_ypos = -1;
29
30	greg	2.3	#define hide_cursor() move_cursor(-1,-1)
31			#define show_cursor() move_cursor(mouse_xpos,mouse_ypos)
32	greg	2.1
33	greg	2.3	#define CTRL(c) ((c)-'@')
34	greg	2.1
35	greg	2.3	#define MAXWIDTH 1024
36			#define MAXHEIGHT 768
37	greg	2.1
38			short ourblack = 0; ourwhite = 1;
39
40	greg	2.3	double gamcor = 2.2; /* gamma correction */
41	greg	2.1
42	greg	2.3	int dither = 1; /* dither colors? */
43	greg	2.1
44	greg	2.3	int maxcolors = 0; /* maximum colors */
45			int minpix = 0; /* minimum pixel value */
46			int greyscale = 0; /* in grey */
47	greg	2.1
48	greg	2.3	int scale = 0; /* scalefactor; power of two */
49	greg	2.1
50	greg	2.3	COLR scanline[MAXWIDTH]; /* scan line buffer */
51	greg	2.1
52	greg	2.3	int xmax, ymax; /* picture dimensions */
53			FILE fin = stdin; / input file */
54			long scanpos[MAXHEIGHT]; /* scan line positions in file */
55			int cury = 0; /* current scan location */
56	greg	2.1
57	greg	2.3	double exposure = 1.0; /* exposure compensation used */
58	greg	2.1
59	greg	2.3	int wrongformat = 0; /* input in another format? */
60	greg	2.1
61			struct {
62			int xmin, ymin, xsiz, ysiz;
63	greg	2.3	} box = {0, 0, 0, 0}; /* current box */
64	greg	2.1
65			int initialized = 0;
66			int cheight, cwidth;
67
68	greg	2.3	#define postext(x,y) _settextposition(1+(y)/cheight,1+(x)/cwidth)
69	greg	2.1
70			char *progname;
71
72			char errmsg[128];
73
74	greg	2.3	extern BYTE clrtab[256][3]; /* global color map */
75	greg	2.1
76			extern long ftell();
77
78
79			main(argc, argv)
80			int argc;
81			char *argv[];
82			{
83			extern char getenv(), fixargv0();
84			char *gv;
85			int headline();
86			int i;
87	greg	2.3
88	greg	2.1	progname = argv[0] = fixargv0(argv[0]);
89			if ((gv = getenv("GAMMA")) != NULL)
90			gamcor = atof(gv);
91
92			for (i = 1; i < argc; i++)
93			if (argv[i][0] == '-')
94			switch (argv[i][1]) {
95			case 'c':
96			maxcolors = atoi(argv[++i]);
97			break;
98			case 'b':
99			greyscale = !greyscale;
100			break;
101			case 'm':
102			maxcolors = 2;
103			break;
104			case 'd':
105			dither = !dither;
106			break;
107			case 'e':
108			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
109			goto userr;
110			scale = atoi(argv[++i]);
111			break;
112			case 'g':
113			gamcor = atof(argv[++i]);
114			break;
115			default:
116			goto userr;
117			}
118			else
119			break;
120
121	greg	2.3	if (i == argc-1) { /* open picture */
122	greg	2.1	fin = fopen(argv[i], "r");
123			if (fin == NULL) {
124			sprintf(errmsg, "cannot open file \"%s\"", argv[i]);
125			quiterr(errmsg);
126			}
127			} else if (i != argc)
128			goto userr;
129			setmode(fileno(fin), O_BINARY);
130			/* get header */
131			getheader(fin, headline, NULL);
132			/* get picture dimensions */
133			if (wrongformat \|\| fgetresolu(&xmax, &ymax, fin) < 0)
134			quiterr("bad picture format");
135			if (xmax > MAXWIDTH \| ymax > MAXHEIGHT)
136			quiterr("input picture too large for VGA");
137
138	greg	2.3	init(); /* initialize and display */
139	greg	2.1
140	greg	2.3	while (docommand()) /* loop on command */
141	greg	2.1	;
142			quiterr(NULL);
143			userr:
144			fprintf(stderr,
145			"Usage: %s [-b][-m][-d][-c ncolors][-e +/-stops] file\n", progname);
146			exit(1);
147			}
148
149
150	greg	2.3	headline(s) /* get relevant info from header */
151	greg	2.1	char *s;
152			{
153			char fmt[32];
154
155			if (isexpos(s))
156			exposure *= exposval(s);
157			else if (isformat(s)) {
158			formatval(fmt, s);
159			wrongformat = strcmp(fmt, COLRFMT);
160			}
161			}
162
163
164	greg	2.3	init() /* initialize and load display */
165	greg	2.1	{
166			static struct {
167	greg	2.3	short mode;
168			short xsiz, ysiz;
169			} video[] = {
170	greg	2.1	{_MRES256COLOR, 320, 200},
171			{_VRES256COLOR, 640, 400},
172			{_SVRES256COLOR, 800, 600},
173			{_XRES256COLOR, 1024, 768},
174			-1
175			};
176	greg	2.3	struct videoconfig config;
177			register int i;
178	greg	2.1	/* pick a card... */
179			for (i = 0; video[i].mode != -1; i++)
180			if (video[i].xsiz >= xmax && video[i].ysiz >= ymax)
181			break;
182			if (video[i].mode == -1)
183			quiterr("input picture too large");
184			if (_setvideomode(video[i].mode) == 0)
185			quiterr("inadequate display card for picture");
186			initialized = 1;
187			_getvideoconfig(&config);
188			if (maxcolors == 0)
189			maxcolors = config.numcolors;
190			if (maxcolors > 4) {
191			maxcolors -= minpix = 2;
192			_settextcolor(ourwhite);
193			}
194			cheight = config.numypixels/config.numtextrows;
195			cwidth = config.numxpixels/config.numtextcols;
196			/* clear scan position array */
197			for (i = 0; i < ymax; i++)
198			scanpos[i] = -1;
199			/* display image */
200			if (greyscale)
201			greyimage();
202			else
203			mappedimage();
204			}
205
206
207	greg	2.3	quiterr(err) /* print message and exit */
208	greg	2.1	char *err;
209			{
210			if (initialized)
211			_setvideomode(_DEFAULTMODE);
212			if (err != NULL) {
213			fprintf(stderr, "%s: %s\n", progname, err);
214			exit(1);
215			}
216			exit(0);
217			}
218
219
220			int
221	greg	2.3	docommand() /* execute command */
222	greg	2.1	{
223			char buf[64];
224			COLOR cval;
225			int com;
226	greg	2.3	double comp;
227	greg	2.1
228			while (!kbhit())
229			watch_mouse();
230			com = getch();
231	greg	2.3	switch (com) { /* interpret command */
232	greg	2.1	case 'q':
233	greg	2.3	case CTRL('Z'): /* quit */
234	greg	2.1	return(0);
235			case '\n':
236			case '\r':
237			case 'l':
238	greg	2.3	case 'c': /* value */
239	greg	2.1	if (avgbox(cval) == -1)
240			return(-1);
241			switch (com) {
242			case '\n':
243	greg	2.3	case '\r': /* radiance */
244	greg	2.1	sprintf(buf, "%.3f", intens(cval)/exposure);
245			break;
246	greg	2.3	case 'l': /* luminance */
247	greg	2.1	sprintf(buf, "%.0fL", luminance(cval)/exposure);
248			break;
249	greg	2.3	case 'c': /* color */
250	greg	2.1	comp = pow(2.0, (double)scale);
251			sprintf(buf, "(%.2f,%.2f,%.2f)",
252			colval(cval,RED)*comp,
253			colval(cval,GRN)*comp,
254			colval(cval,BLU)*comp);
255			break;
256			}
257			postext(box.xmin+box.xsiz/2, box.ymin+box.ysiz/2);
258	greg	2.2	hide_cursor();
259	greg	2.1	_outtext(buf);
260	greg	2.2	show_cursor();
261	greg	2.1	return(1);
262			default:
263			return(-1);
264			}
265			}
266
267
268	greg	2.3	watch_mouse() /* look after mousie */
269	greg	2.1	{
270	greg	2.3	static int mouse_installed = 0;
271			int a_x, a_y, l_x, l_y;
272	greg	2.1
273			if (!mouse_installed) {
274			ms_init();
275			mouse_installed = 1;
276			}
277			if (mouse_event & M_MOTION)
278			move_cursor(mouse_xpos, mouse_ypos);
279			if (!(mouse_event & M_LDOWN))
280			return;
281			l_x = a_x = mouse_xpos; l_y = a_y = mouse_ypos;
282	greg	2.2	hide_cursor();
283	greg	2.3	revbox(a_x, a_y, l_x, l_y); /* show box */
284	greg	2.1	do {
285			mouse_event = 0;
286			while (!mouse_event)
287			;
288			if (mouse_event & M_MOTION) {
289			revbox(a_x, a_y, l_x, l_y);
290			revbox(a_x, a_y, l_x=mouse_xpos, l_y=mouse_ypos);
291			}
292			} while (!(mouse_event & M_LUP));
293	greg	2.3	revbox(a_x, a_y, l_x, l_y); /* hide box */
294	greg	2.2	show_cursor();
295	greg	2.1	box.xmin = mouse_xpos;
296			box.ymin = mouse_ypos;
297			if (box.xmin > a_x) {
298			box.xsiz = box.xmin - a_x + 1;
299			box.xmin = a_x;
300			} else {
301			box.xsiz = a_x - box.xmin + 1;
302			}
303			if (box.ymin > a_y) {
304			box.ysiz = box.ymin - a_y + 1;
305			box.ymin = a_y;
306			} else {
307			box.ysiz = a_y - box.ymin + 1;
308			}
309			mouse_event = 0;
310			}
311
312
313	greg	2.3	revbox(x0, y0, x1, y1) /* draw box with reversed lines */
314	greg	2.1	int x0, y0, x1, y1;
315			{
316			_setplotaction(_GXOR);
317			_setcolor(255);
318			_moveto(x0, y0);
319			_lineto(x1, y0);
320			_lineto(x1, y1);
321			_lineto(x0, y1);
322			_lineto(x0, y0);
323			}
324
325
326			int
327	greg	2.3	avgbox(clr) /* average color over current box */
328	greg	2.1	COLOR clr;
329			{
330			static COLOR lc;
331			static int ll, lr, lt, lb;
332			int left, right, top, bottom;
333			int y;
334	greg	2.3	double d;
335	greg	2.1	COLOR ctmp;
336			register int x;
337
338			setcolor(clr, 0.0, 0.0, 0.0);
339			left = box.xmin;
340			right = left + box.xsiz;
341			if (left < 0)
342			left = 0;
343			if (right > xmax)
344			right = xmax;
345			if (left >= right)
346			return(-1);
347			top = box.ymin;
348			bottom = top + box.ysiz;
349			if (top < 0)
350			top = 0;
351			if (bottom > ymax)
352			bottom = ymax;
353			if (top >= bottom)
354			return(-1);
355			if (left == ll && right == lr && top == lt && bottom == lb) {
356			copycolor(clr, lc);
357			return(0);
358			}
359			for (y = top; y < bottom; y++) {
360			if (getscan(y) == -1)
361			return(-1);
362			for (x = left; x < right; x++) {
363			colr_color(ctmp, scanline[x]);
364			addcolor(clr, ctmp);
365			}
366			}
367			d = 1.0/((right-left)*(bottom-top));
368			scalecolor(clr, d);
369			ll = left; lr = right; lt = top; lb = bottom;
370			copycolor(lc, clr);
371			return(0);
372			}
373
374
375	greg	2.3	setpalette() /* set our palette using clrtab */
376	greg	2.1	{
377	greg	2.3	long cvals[256];
378			register int i;
379	greg	2.1
380			if (minpix >= 2) {
381			cvals[ourblack] = _BLACK; cvals[ourwhite] = _BRIGHTWHITE;
382			}
383			for (i = 0; i < maxcolors; i++)
384			cvals[i+minpix] = clrtab[i][BLU]<<14 & 0x3f0000L \|
385			clrtab[i][GRN]<<6 & 0x3f00 \|
386			clrtab[i][RED]>>2;
387			_remapallpalette(cvals);
388			}
389
390
391	greg	2.3	greyimage() /* display greyscale image */
392	greg	2.1	{
393	greg	2.3	short thiscolor, lastcolor = -1;
394			int y;
395			register int x;
396	greg	2.1	/* set gamma correction */
397			setcolrgam(gamcor);
398			/* set up color map */
399			for (x = 0; x < maxcolors; x++)
400			clrtab[x][RED] = clrtab[x][GRN] =
401			clrtab[x][BLU] = ((long)x*256+maxcolors/2)/maxcolors;
402			setpalette();
403			_setplotaction(_GPSET);
404			/* read and display file */
405			for (y = 0; y < ymax; y++) {
406			getscan(y);
407			if (scale)
408			shiftcolrs(scanline, xmax, scale);
409			colrs_gambs(scanline, xmax);
410			if (maxcolors < 256)
411	greg	2.3	for (x = 0; x < xmax; x++) {
412	greg	2.1	thiscolor = ((long)normbright(scanline[x]) *
413			maxcolors + 128) >> 8;
414			if (thiscolor != lastcolor)
415			_setcolor((lastcolor=thiscolor)+minpix);
416			_setpixel(x, y);
417			}
418			else
419			for (x = 0; x < xmax; x++) {
420			thiscolor = normbright(scanline[x]);
421			if (thiscolor != lastcolor)
422			_setcolor((lastcolor=thiscolor)+minpix);
423			_setpixel(x, y);
424			}
425			}
426			}
427
428
429	greg	2.3	mappedimage() /* display color-mapped image */
430	greg	2.1	{
431	greg	2.3	BYTE bscan[MAXWIDTH];
432			int y;
433			register int x;
434	greg	2.1	/* set gamma correction */
435			setcolrgam(gamcor);
436			/* make histogram */
437			new_histo();
438			for (y = 0; y < ymax; y++) {
439			if (getscan(y) < 0)
440			quiterr("seek error in getmapped");
441			if (scale)
442			shiftcolrs(scanline, xmax, scale);
443			colrs_gambs(scanline, xmax);
444			cnt_colrs(scanline, xmax);
445			}
446			/* map pixels */
447			if (!new_clrtab(maxcolors))
448			quiterr("cannot create color map");
449			setpalette();
450			_setplotaction(_GPSET);
451			/* display image */
452			for (y = 0; y < ymax; y++) {
453			if (getscan(y) < 0)
454			quiterr("seek error in getmapped");
455			if (scale)
456			shiftcolrs(scanline, xmax, scale);
457			colrs_gambs(scanline, xmax);
458			if (dither)
459			dith_colrs(bscan, scanline, xmax);
460			else
461			map_colrs(bscan, scanline, xmax);
462			for (x = 0; x < xmax; x++) {
463			if (x==0 \|\| bscan[x] != bscan[x-1])
464			_setcolor(bscan[x]+minpix);
465			_setpixel(x, y);
466			}
467			}
468			}
469
470
471			getscan(y)
472			int y;
473			{
474			if (y != cury) {
475			if (scanpos[y] == -1)
476			return(-1);
477			if (fseek(fin, scanpos[y], 0) == -1)
478			quiterr("fseek error");
479			cury = y;
480			} else if (scanpos != NULL && scanpos[y] == -1)
481			scanpos[y] = ftell(fin);
482
483			if (freadcolrs(scanline, xmax, fin) < 0)
484			quiterr("picture read error");
485
486			cury++;
487			return(0);
488			}
489
490
491			/*
492			* Microsoft Mouse handling routines
493			*/
494
495
496			#pragma off (check_stack)
497			void _loadds far mouse_handler (int max, int mcx, int mdx)
498			{
499			#pragma aux mouse_handler parm [EAX] [ECX] [EDX]
500			mouse_event = max;
501			mouse_xpos = mcx;
502	greg	2.3	mouse_ypos = mdx;
503	greg	2.1	}
504			#pragma on (check_stack)
505
506
507			void
508	greg	2.3	move_cursor(newx, newy) /* move cursor to new position */
509	greg	2.1	int newx, newy;
510			{
511			static char *imp = NULL;
512			static int curx = -1, cury = -1;
513	greg	2.3	#define xcmin (curx-crad<0 ? 0 : curx-crad)
514			#define ycmin (cury-crad<0 ? 0 : cury-crad)
515			#define xcmax (curx+crad>=xmax ? xmax-1 : curx+crad)
516			#define ycmax (cury+crad>=ymax ? ymax-1 : cury+crad)
517	greg	2.1
518			if (newx == curx & newy == cury)
519			return;
520	greg	2.3	if (imp == NULL &&
521	greg	2.1	(imp = bmalloc(_imagesize(0,0,2crad+1,2crad+1))) == NULL) {
522			quiterr("out of memory in move_cursor");
523			}
524	greg	2.3	if (curx >= 0 & cury >= 0) /* clear old cursor */
525	greg	2.1	_putimage(xcmin, ycmin, imp, _GPSET);
526			/* record new position */
527			curx = newx; cury = newy;
528			if (curx < 0 \| cury < 0)
529	greg	2.3	return; /* no cursor */
530	greg	2.1	/* save under new cursor */
531			_getimage(xcmin, ycmin, xcmax, ycmax, imp);
532			/* draw new cursor */
533			_setplotaction(_GPSET);
534			_setcolor(ourwhite);
535			_rectangle(_GFILLINTERIOR, xcmin, cury-1, xcmax, cury+1);
536			_rectangle(_GFILLINTERIOR, curx-1, ycmin, curx+1, ycmax);
537			_setcolor(ourblack);
538			_moveto(xcmin+1, cury);
539			_lineto(xcmax-1, cury);
540			_moveto(curx, ycmin+1);
541			_lineto(curx, ycmax-1);
542			#undef xcmin
543			#undef ycmin
544			#undef xcmax
545			#undef ycmax
546			}
547
548
549			int
550			ms_init()
551			{
552			struct SREGS sregs;
553			union REGS inregs, outregs;
554			int far *ptr;
555			int (far *function_ptr)();
556
557			segread(&sregs);
558
559			/* check for mouse driver */
560
561			inregs.w.ax = 0;
562			int386 (0x33, &inregs, &outregs);
563			if( outregs.w.ax != -1 ) {
564			return(0);
565			}
566
567			crad = ymax/40;
568	greg	2.3
569			/* set screen limits */
570
571			inregs.w.ax = 0x7; /* horizontal resolution */
572			inregs.w.cx = 0;
573			inregs.w.dx = xmax-1;
574			int386x( 0x33, &inregs, &outregs, &sregs );
575			inregs.w.ax = 0x8; /* vertical resolution */
576			inregs.w.cx = 0;
577			inregs.w.dx = ymax-1;
578			int386x( 0x33, &inregs, &outregs, &sregs );
579
580	greg	2.1	/* install watcher */
581
582			inregs.w.ax = 0xC;
583			inregs.w.cx = M_LDOWN \| M_LUP \| M_MOTION;
584			function_ptr = mouse_handler;
585			inregs.x.edx = FP_OFF( function_ptr );
586	greg	2.3	sregs.es = FP_SEG( function_ptr );
587	greg	2.1	int386x( 0x33, &inregs, &outregs, &sregs );
588	greg	2.3
589	greg	2.1	return(1);
590			}