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- /* Copyright (c) 1992 Regents of the University of California */
-
- #ifndef lint
- static char SCCSid[] = "@(#)x11image.c 2.17 10/22/92 LBL";
- #endif
-
- /*
- * x11image.c - driver for X-windows
- *
- * 3/1/90
- */
-
- /*
- * Modified for X11
- *
- * January 1990
- *
- * Anat Grynberg and Greg Ward
- */
-
-
- #include "standard.h"
-
- #include <X11/Xlib.h>
- #include <X11/cursorfont.h>
- #include <X11/Xutil.h>
-
- #include "color.h"
- #include "view.h"
- #include "x11raster.h"
- #include "random.h"
- #include "resolu.h"
-
- #define FONTNAME "8x13" /* text font we'll use */
-
- #define CTRL(c) ((c)-'@')
-
- #define BORWIDTH 5 /* border width */
-
- #define ICONSIZ (8*10) /* maximum icon dimension (even 8) */
-
- #define ourscreen DefaultScreen(thedisplay)
- #define ourroot RootWindow(thedisplay,ourscreen)
-
- #define revline(x0,y0,x1,y1) XDrawLine(thedisplay,wind,revgc,x0,y0,x1,y1)
-
- #define redraw(x,y,w,h) patch_raster(wind,(x)-xoff,(y)-yoff,x,y,w,h,ourras)
-
- double gamcor = 2.2; /* gamma correction */
-
- int dither = 1; /* dither colors? */
- int fast = 0; /* keep picture in Pixmap? */
-
- char *dispname = NULL; /* our display name */
-
- Window wind = 0; /* our output window */
- unsigned long ourblack=0, ourwhite=1; /* black and white for this visual */
- 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 */
-
- RESOLU inpres; /* input resolution and ordering */
- int xmax, ymax; /* picture dimensions */
- 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? */
-
- GC ourgc; /* standard graphics context */
- GC revgc; /* graphics context with GXinvert */
-
- int *ourrank; /* our visual class ranking */
- XVisualInfo ourvis; /* our visual */
- XRASTER *ourras; /* our stored image */
- unsigned char *ourdata; /* our image data */
-
- struct {
- int xmin, ymin, xsiz, ysiz;
- } box = {0, 0, 0, 0}; /* current box */
-
- char *geometry = NULL; /* geometry specification */
-
- char icondata[ICONSIZ*ICONSIZ/8]; /* icon bitmap data */
- int iconwidth = 0, iconheight = 0;
-
- char *progname;
-
- char errmsg[128];
-
- extern BYTE clrtab[256][3]; /* global color map */
-
- extern long ftell();
-
- extern char *malloc(), *calloc();
-
- Display *thedisplay;
-
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- extern char *getenv();
- char *gv;
- int headline();
- int i;
-
- progname = 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':
- if (argv[i][2] == 'i')
- dispname = argv[++i];
- else
- 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':
- if (argv[i][2] == 'e')
- geometry = argv[++i];
- else
- gamcor = atof(argv[++i]);
- break;
- default:
- goto userr;
- }
- else if (argv[i][0] == '=')
- geometry = argv[i];
- else
- break;
-
- if (i == argc-1) {
- fname = argv[i];
- fin = fopen(fname, "r");
- if (fin == NULL) {
- sprintf(errmsg, "cannot open file \"%s\"", fname);
- quiterr(errmsg);
- }
- } else if (i != argc)
- goto userr;
- /* get header */
- getheader(fin, headline, NULL);
- /* get picture dimensions */
- if (wrongformat || !fgetsresolu(&inpres, fin))
- quiterr("bad picture format");
- xmax = scanlen(&inpres);
- ymax = numscans(&inpres);
- /* 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 [-display disp][-geometry spec][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n",
- progname);
- quit(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);
- } else if (isview(s) && sscanview(&ourview, s) > 0)
- gotview++;
- }
-
-
- init() /* get data and open window */
- {
- XWMHints ourxwmhints;
- XSetWindowAttributes ourwinattr;
- XSizeHints oursizhints;
- register int i;
-
- if (fname != NULL) {
- scanpos = (long *)malloc(ymax*sizeof(long));
- if (scanpos == NULL)
- goto memerr;
- for (i = 0; i < ymax; i++)
- scanpos[i] = -1;
- }
- if ((thedisplay = XOpenDisplay(dispname)) == NULL)
- quiterr("cannot open display");
- /* get best visual for default screen */
- getbestvis();
- /* store image */
- getras();
- /* open window */
- ourwinattr.border_pixel = ourblack;
- ourwinattr.background_pixel = ourwhite;
- ourwinattr.colormap = XCreateColormap(thedisplay, ourroot,
- ourvis.visual, AllocNone);
- wind = XCreateWindow(thedisplay, ourroot, 0, 0, xmax, ymax, BORWIDTH,
- ourvis.depth, InputOutput, ourvis.visual,
- CWBackPixel|CWBorderPixel|CWColormap, &ourwinattr);
- if (wind == 0)
- quiterr("cannot create window");
- XFreeColormap(thedisplay, ourwinattr.colormap);
- width = xmax;
- height = ymax;
- ourgc = XCreateGC(thedisplay, wind, 0, 0);
- XSetState(thedisplay, ourgc, ourblack, ourwhite, GXcopy, AllPlanes);
- revgc = XCreateGC(thedisplay, wind, 0, 0);
- XSetFunction(thedisplay, revgc, GXinvert);
- fontid = XLoadFont(thedisplay, FONTNAME);
- if (fontid == 0)
- quiterr("cannot get font");
- XSetFont(thedisplay, ourgc, fontid);
- XDefineCursor(thedisplay, wind, XCreateFontCursor(thedisplay,
- XC_diamond_cross));
- XStoreName(thedisplay, wind, fname == NULL ? progname : fname);
- if (geometry != NULL) {
- bzero((char *)&oursizhints, sizeof(oursizhints));
- i = XParseGeometry(geometry, &oursizhints.x, &oursizhints.y,
- (unsigned *)&oursizhints.width,
- (unsigned *)&oursizhints.height);
- if ((i&(WidthValue|HeightValue)) == (WidthValue|HeightValue))
- oursizhints.flags |= USSize;
- else {
- oursizhints.width = xmax;
- oursizhints.height = ymax;
- oursizhints.flags |= PSize;
- }
- if ((i&(XValue|YValue)) == (XValue|YValue)) {
- oursizhints.flags |= USPosition;
- if (i & XNegative)
- oursizhints.x += DisplayWidth(thedisplay,
- ourscreen)-1-oursizhints.width-2*BORWIDTH;
- if (i & YNegative)
- oursizhints.y += DisplayHeight(thedisplay,
- ourscreen)-1-oursizhints.height-2*BORWIDTH;
- }
- XSetNormalHints(thedisplay, wind, &oursizhints);
- }
- ourxwmhints.flags = InputHint|IconPixmapHint;
- ourxwmhints.input = True;
- ourxwmhints.icon_pixmap = XCreateBitmapFromData(thedisplay,
- wind, icondata, iconwidth, iconheight);
- XSetWMHints(thedisplay, wind, &ourxwmhints);
- XSelectInput(thedisplay, wind, ButtonPressMask|ButtonReleaseMask
- |ButtonMotionMask|StructureNotifyMask
- |KeyPressMask|ExposureMask);
- XMapWindow(thedisplay, wind);
- return;
- memerr:
- quiterr("out of memory");
- } /* end of init */
-
-
- quiterr(err) /* print message and exit */
- char *err;
- {
- if (err != NULL) {
- fprintf(stderr, "%s: %s\n", progname, err);
- exit(1);
- }
- exit(0);
- }
-
-
- static int
- viscmp(v1,v2) /* compare visual to see which is better, descending */
- register XVisualInfo *v1, *v2;
- {
- int bad1 = 0, bad2 = 0;
- register int *rp;
-
- if (v1->class == v2->class) {
- if (v1->class == TrueColor || v1->class == DirectColor) {
- /* prefer 24-bit to 32-bit */
- if (v1->depth == 24 && v2->depth == 32)
- return(-1);
- if (v1->depth == 32 && v2->depth == 24)
- return(1);
- return(0);
- }
- /* don't be too greedy */
- if (maxcolors <= 1<<v1->depth && maxcolors <= 1<<v2->depth)
- return(v1->depth - v2->depth);
- return(v2->depth - v1->depth);
- }
- /* prefer Pseudo when < 24-bit */
- if ((v1->class == TrueColor || v1->class == DirectColor) &&
- v1->depth < 24)
- bad1 = 1;
- if ((v2->class == TrueColor || v2->class == DirectColor) &&
- v2->depth < 24)
- bad2 = -1;
- if (bad1 | bad2)
- return(bad1+bad2);
- /* otherwise, use class ranking */
- for (rp = ourrank; *rp != -1; rp++) {
- if (v1->class == *rp)
- return(-1);
- if (v2->class == *rp)
- return(1);
- }
- return(0);
- }
-
-
- getbestvis() /* get the best visual for this screen */
- {
- #ifdef DEBUG
- static char vistype[][12] = {
- "StaticGray",
- "GrayScale",
- "StaticColor",
- "PseudoColor",
- "TrueColor",
- "DirectColor"
- };
- #endif
- static int rankings[3][6] = {
- {TrueColor,DirectColor,PseudoColor,GrayScale,StaticGray,-1},
- {PseudoColor,GrayScale,StaticGray,-1},
- {PseudoColor,GrayScale,StaticGray,-1}
- };
- XVisualInfo *xvi;
- int vismatched;
- register int i, j;
-
- if (greyscale) {
- ourrank = rankings[2];
- if (maxcolors < 2) maxcolors = 256;
- } else if (maxcolors >= 2 && maxcolors <= 256)
- ourrank = rankings[1];
- else {
- ourrank = rankings[0];
- maxcolors = 256;
- }
- /* find best visual */
- ourvis.screen = ourscreen;
- xvi = XGetVisualInfo(thedisplay,VisualScreenMask,&ourvis,&vismatched);
- if (xvi == NULL)
- quiterr("no visuals for this screen!");
- #ifdef DEBUG
- fprintf(stderr, "Supported visuals:\n");
- for (i = 0; i < vismatched; i++)
- fprintf(stderr, "\ttype %s, depth %d\n",
- vistype[xvi[i].class], xvi[i].depth);
- #endif
- for (i = 0, j = 1; j < vismatched; j++)
- if (viscmp(&xvi[i],&xvi[j]) > 0)
- i = j;
- /* compare to least acceptable */
- for (j = 0; ourrank[j++] != -1; )
- ;
- ourvis.class = ourrank[--j];
- ourvis.depth = 1;
- if (viscmp(&xvi[i],&ourvis) > 0)
- quiterr("inadequate visuals on this screen");
- /* OK, we'll use it */
- copystruct(&ourvis, &xvi[i]);
- #ifdef DEBUG
- fprintf(stderr, "Selected visual type %s, depth %d\n",
- vistype[ourvis.class], ourvis.depth);
- #endif
- /* make appropriate adjustments */
- if (ourvis.class == GrayScale || ourvis.class == StaticGray)
- greyscale = 1;
- if (ourvis.depth <= 8 && ourvis.colormap_size < maxcolors)
- maxcolors = ourvis.colormap_size;
- if (ourvis.class == StaticGray) {
- ourblack = 0;
- ourwhite = 255;
- } else if (ourvis.class == PseudoColor) {
- ourblack = BlackPixel(thedisplay,ourscreen);
- ourwhite = WhitePixel(thedisplay,ourscreen);
- if ((ourblack|ourwhite) & ~255L) {
- ourblack = 0;
- ourwhite = 1;
- }
- if (maxcolors > 4)
- maxcolors -= 2;
- } else {
- ourblack = 0;
- ourwhite = ourvis.red_mask|ourvis.green_mask|ourvis.blue_mask;
- }
- XFree((char *)xvi);
- }
-
-
- getras() /* get raster file */
- {
- XVisualInfo vinfo;
-
- if (maxcolors <= 2) { /* monochrome */
- ourdata = (unsigned char *)malloc(ymax*((xmax+7)/8));
- if (ourdata == NULL)
- goto fail;
- ourras = make_raster(thedisplay, &ourvis, 1, ourdata,
- xmax, ymax, 8);
- if (ourras == NULL)
- goto fail;
- getmono();
- } else if (ourvis.class == TrueColor | ourvis.class == DirectColor) {
- ourdata = (unsigned char *)malloc(4*xmax*ymax);
- if (ourdata == NULL)
- goto fail;
- ourras = make_raster(thedisplay, &ourvis, 32,
- ourdata, xmax, ymax, 32);
- if (ourras == NULL)
- goto fail;
- getfull();
- } else {
- ourdata = (unsigned char *)malloc(xmax*ymax);
- if (ourdata == NULL)
- goto fail;
- ourras = make_raster(thedisplay, &ourvis, 8, ourdata,
- xmax, ymax, 8);
- if (ourras == NULL)
- goto fail;
- if (greyscale | ourvis.class == StaticGray)
- getgrey();
- else
- getmapped();
- if (ourvis.class != StaticGray && !init_rcolors(ourras,clrtab))
- goto fail;
- }
- return;
- fail:
- quiterr("could not create raster image");
- }
-
-
- getevent() /* process the next event */
- {
- union {
- XEvent u;
- XConfigureEvent c;
- XExposeEvent e;
- XButtonPressedEvent b;
- XKeyPressedEvent k;
- } e;
-
- XNextEvent(thedisplay, &e.u);
- switch (e.u.type) {
- case KeyPress:
- docom(&e.k);
- break;
- case ConfigureNotify:
- width = e.c.width;
- height = e.c.height;
- break;
- case MapNotify:
- map_rcolors(ourras, wind);
- if (fast)
- make_rpixmap(ourras, wind);
- break;
- case UnmapNotify:
- if (!fast)
- unmap_rcolors(ourras);
- break;
- case Expose:
- redraw(e.e.x, e.e.y, e.e.width, e.e.height);
- break;
- case ButtonPress:
- if (e.b.state & (ShiftMask|ControlMask))
- moveimage(&e.b);
- else
- getbox(&e.b);
- break;
- }
- }
-
-
- docom(ekey) /* execute command */
- XKeyPressedEvent *ekey;
- {
- char buf[80];
- COLOR cval;
- XColor cvx;
- int com, n;
- double comp;
- FLOAT hv[2];
- FVECT rorg, rdir;
-
- n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL);
- if (n == 0)
- return(0);
- com = buf[0];
- switch (com) { /* 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 (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;
- }
- XDrawImageString(thedisplay, wind, ourgc,
- box.xmin, box.ymin+box.ysiz, buf, strlen(buf));
- return(0);
- case 'i': /* identify (contour) */
- if (ourras->pixels == NULL)
- return(-1);
- n = ourdata[ekey->x-xoff+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;
- cvx.flags = DoRed|DoGreen|DoBlue;
- XStoreColor(thedisplay, ourras->cmap, &cvx);
- return(0);
- case 'p': /* position */
- pix2loc(hv, &inpres, ekey->x-xoff, ekey->y-yoff);
- sprintf(buf, "(%d,%d)", (int)(hv[0]*inpres.xr),
- (int)(hv[1]*inpres.yr));
- XDrawImageString(thedisplay, wind, ourgc, ekey->x, ekey->y,
- buf, strlen(buf));
- return(0);
- case 't': /* trace */
- if (!gotview) {
- XBell(thedisplay, 0);
- return(-1);
- }
- pix2loc(hv, &inpres, ekey->x-xoff, ekey->y-yoff);
- if (viewray(rorg, rdir, &ourview, hv[0], hv[1]) < 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);
- XDrawImageString(thedisplay, wind, ourgc,
- box.xmin, box.ymin+box.ysiz, buf, strlen(buf));
- XFlush(thedisplay);
- free(ourdata);
- free_raster(ourras);
- getras();
- /* fall through */
- case CTRL('R'): /* redraw */
- case CTRL('L'):
- unmap_rcolors(ourras);
- XClearWindow(thedisplay, wind);
- map_rcolors(ourras, wind);
- if (fast)
- make_rpixmap(ourras, wind);
- redraw(0, 0, width, height);
- return(0);
- case ' ': /* clear */
- redraw(box.xmin, box.ymin, box.xsiz, box.ysiz);
- return(0);
- default:
- XBell(thedisplay, 0);
- return(-1);
- }
- }
-
-
- moveimage(ebut) /* shift the image */
- XButtonPressedEvent *ebut;
- {
- union {
- XEvent u;
- XButtonReleasedEvent b;
- XPointerMovedEvent m;
- } e;
- int mxo, myo;
-
- XMaskEvent(thedisplay, ButtonReleaseMask|ButtonMotionMask, &e.u);
- while (e.u.type == MotionNotify) {
- mxo = e.m.x;
- myo = e.m.y;
- revline(ebut->x, ebut->y, mxo, myo);
- revbox(xoff+mxo-ebut->x, yoff+myo-ebut->y,
- xoff+mxo-ebut->x+xmax, yoff+myo-ebut->y+ymax);
- XMaskEvent(thedisplay,ButtonReleaseMask|ButtonMotionMask,&e.u);
- revline(ebut->x, ebut->y, mxo, myo);
- revbox(xoff+mxo-ebut->x, yoff+myo-ebut->y,
- xoff+mxo-ebut->x+xmax, yoff+myo-ebut->y+ymax);
- }
- xoff += e.b.x - ebut->x;
- yoff += e.b.y - ebut->y;
- XClearWindow(thedisplay, wind);
- redraw(0, 0, width, height);
- }
-
-
- getbox(ebut) /* get new box */
- XButtonPressedEvent *ebut;
- {
- union {
- XEvent u;
- XButtonReleasedEvent b;
- XPointerMovedEvent m;
- } e;
-
- XMaskEvent(thedisplay, ButtonReleaseMask|ButtonMotionMask, &e.u);
- while (e.u.type == MotionNotify) {
- revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y);
- XMaskEvent(thedisplay,ButtonReleaseMask|ButtonMotionMask,&e.u);
- 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;
- {
- revline(x0, y0, x1, y0);
- revline(x0, y1, x1, y1);
- revline(x0, y0, x0, y1);
- revline(x1, y0, x1, y1);
- }
-
-
- 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 - 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);
- 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);
- }
-
-
- getmono() /* get monochrome data */
- {
- register unsigned char *dp;
- register int x, err;
- int y, errp;
- short *cerr;
-
- if ((cerr = (short *)calloc(xmax,sizeof(short))) == NULL)
- quiterr("out of memory in getmono");
- dp = ourdata - 1;
- for (y = 0; y < ymax; y++) {
- getscan(y);
- add2icon(y, scanline);
- normcolrs(scanline, xmax, scale);
- err = 0;
- for (x = 0; x < xmax; x++) {
- if (!(x&7))
- *++dp = 0;
- errp = err;
- err += normbright(scanline[x]) + cerr[x];
- if (err > 127)
- err -= 255;
- else
- *dp |= 1<<(7-(x&07));
- err /= 3;
- cerr[x] = err + errp;
- }
- }
- free((char *)cerr);
- }
-
-
- add2icon(y, scan) /* add a scanline to our icon data */
- int y;
- COLR *scan;
- {
- static short cerr[ICONSIZ];
- static int ynext;
- static char *dp;
- COLR clr;
- register int err;
- register int x, ti;
- int errp;
-
- if (iconheight == 0) { /* initialize */
- if (xmax <= ICONSIZ && ymax <= ICONSIZ) {
- iconwidth = xmax;
- iconheight = ymax;
- } else if (xmax > ymax) {
- iconwidth = ICONSIZ;
- iconheight = ICONSIZ*ymax/xmax;
- if (iconheight < 1)
- iconheight = 1;
- } else {
- iconwidth = ICONSIZ*xmax/ymax;
- if (iconwidth < 1)
- iconwidth = 1;
- iconheight = ICONSIZ;
- }
- ynext = 0;
- dp = icondata - 1;
- }
- if (y < ynext*ymax/iconheight) /* skip this one */
- return;
- err = 0;
- for (x = 0; x < iconwidth; x++) {
- if (!(x&7))
- *++dp = 0;
- errp = err;
- ti = x*xmax/iconwidth;
- copycolr(clr, scan[ti]);
- normcolrs(clr, 1, scale);
- err += normbright(clr) + cerr[x];
- if (err > 127)
- err -= 255;
- else
- *dp |= 1<<(x&07);
- err /= 3;
- cerr[x] = err + errp;
- }
- ynext++;
- }
-
-
- getfull() /* get full (24-bit) data */
- {
- int y;
- register unsigned long *dp;
- register int x;
- /* set gamma correction */
- setcolrgam(gamcor);
- /* read and convert file */
- dp = (unsigned long *)ourdata;
- for (y = 0; y < ymax; y++) {
- getscan(y);
- add2icon(y, scanline);
- if (scale)
- shiftcolrs(scanline, xmax, scale);
- colrs_gambs(scanline, xmax);
- if (ourras->image->blue_mask & 1)
- for (x = 0; x < xmax; x++)
- *dp++ = scanline[x][RED] << 16 |
- scanline[x][GRN] << 8 |
- scanline[x][BLU] ;
- else
- for (x = 0; x < xmax; x++)
- *dp++ = scanline[x][RED] |
- scanline[x][GRN] << 8 |
- scanline[x][BLU] << 16 ;
- }
- }
-
-
- getgrey() /* get greyscale data */
- {
- int y;
- register unsigned char *dp;
- register int x;
- /* set gamma correction */
- setcolrgam(gamcor);
- /* read and convert file */
- dp = ourdata;
- for (y = 0; y < ymax; y++) {
- getscan(y);
- add2icon(y, scanline);
- if (scale)
- shiftcolrs(scanline, xmax, scale);
- colrs_gambs(scanline, xmax);
- if (maxcolors < 256)
- for (x = 0; x < xmax; x++)
- *dp++ = ((long)normbright(scanline[x]) *
- maxcolors + 128) >> 8;
- else
- for (x = 0; x < xmax; x++)
- *dp++ = normbright(scanline[x]);
- }
- for (x = 0; x < maxcolors; x++)
- clrtab[x][RED] = clrtab[x][GRN] =
- clrtab[x][BLU] = ((long)x*256+maxcolors/2)/maxcolors;
- }
-
-
- getmapped() /* get color-mapped data */
- {
- int y;
- /* set gamma correction */
- setcolrgam(gamcor);
- /* make histogram */
- new_histo();
- for (y = 0; y < ymax; y++) {
- if (getscan(y) < 0)
- quiterr("seek error in getmapped");
- add2icon(y, scanline);
- 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");
- 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(ourdata+y*xmax, scanline, xmax);
- else
- map_colrs(ourdata+y*xmax, scanline, xmax);
- }
- }
-
-
- 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(thedisplay, xr->cmap, xr->cdefs, xr->ncolors);
- }
-
-
- 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);
- }
-