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gwlarson |
3.1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */
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#ifndef lint
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static char SCCSid[] = "$SunId$ SGI";
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#endif
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/*
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* Routines for tone-mapping LogLuv encoded pixels.
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*/
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#include <stdio.h>
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#include <math.h>
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#include "tiffio.h"
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#include "tmprivat.h"
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#include "uvcode.h"
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#ifndef BSD
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#define bzero(d,n) (void)memset(d,0,n)
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#endif
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#define uvflgop(p,uv,op) ((p)->rgbflg[(uv)>>5] op (1L<<((uv)&0x1f)))
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#define isuvset(p,uv) uvflgop(p,uv,&)
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#define setuv(p,uv) uvflgop(p,uv,|=)
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#define clruv(p,uv) uvflgop(p,uv,&=~)
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#define clruvall(p) bzero((MEM_PTR)(p)->rgbflg,sizeof((p)->rgbflg))
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#define U_NEU 0.210526316
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#define V_NEU 0.473684211
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static MEM_PTR luv32Init();
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static void luv32NewSpace();
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static MEM_PTR luv24Init();
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static void luv24NewSpace();
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extern void free();
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typedef struct {
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int offset; /* computed luminance offset */
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BYTE rgbval[1<<16][3]; /* computed RGB value for given uv */
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uint32 rgbflg[1<<(16-5)]; /* flags for computed values */
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} LUV32DATA; /* LogLuv 32-bit conversion data */
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#define UVSCALE 410.
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#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \
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| (int)(UVSCALE*V_NEU))
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static struct tmPackage luv32Pkg = { /* 32-bit package functions */
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luv32Init, luv32NewSpace, free
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};
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static int luv32Reg = -1; /* 32-bit package reg. number */
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typedef struct {
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int offset; /* computed luminance offset */
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BYTE rgbval[1<<14][3]; /* computed rgb value for uv index */
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uint32 rgbflg[1<<(14-5)]; /* flags for computed values */
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} LUV24DATA; /* LogLuv 24-bit conversion data */
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static struct tmPackage luv24Pkg = { /* 24-bit package functions */
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luv24Init, luv24NewSpace, free
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};
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static int luv24Reg = -1; /* 24-bit package reg. number */
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static int uv14neu = -1; /* neutral index for 14-bit (u',v') */
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static
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uv2rgb(rgb, tm, uvp) /* compute RGB from uv coordinate */
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BYTE rgb[3];
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register struct tmStruct *tm;
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double uvp[2];
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{ /* Should check that tm->inppri==TM_XYZPRIM beforehand... */
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double d, x, y;
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COLR XYZ, RGB;
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/* convert to XYZ */
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d = 1./(6.*uvp[0] - 16.*uvp[1] + 12.);
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x = 9.*uvp[0] * d;
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y = 4.*uvp[1] * d;
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XYZ[CIEY] = 1./tm->inpsf;
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XYZ[CIEX] = x/y * XYZ[CIEY];
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XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
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/* convert to RGB and clip */
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colortrans(RGB, tm->cmat, XYZ);
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clipgamut(RGB, XYZ[CIEY], CGAMUT_LOWER, cblack, cwhite);
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/* perform final scaling & gamma */
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d = tm->clf[RED] * RGB[RED];
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rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
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d = tm->clf[GRN] * RGB[GRN];
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rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
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d = tm->clf[BLU] * RGB[BLU];
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rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
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}
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static TMbright
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compmeshift(li, uvp) /* compute mesopic color shift */
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TMbright li; /* encoded world luminance */
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double uvp[2]; /* world (u',v') -> returned desaturated */
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{
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/* UNIMPLEMENTED */
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return(li);
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}
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static int
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uvpencode(uvp) /* encode (u',v') coordinates */
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double uvp[2];
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{
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register int vi, ui;
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if (uvp[1] < UV_VSTART)
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return(-1);
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vi = (uvp[1] - UV_VSTART)*(1./UV_SQSIZ);
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if (vi >= UV_NVS)
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return(-1);
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if (uvp[0] < uv_row[vi].ustart)
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return(-1);
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ui = (uvp[0] - uv_row[vi].ustart)*(1./UV_SQSIZ);
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if (ui >= uv_row[vi].nus)
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return(-1);
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return(uv_row[vi].ncum + ui);
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}
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static int
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uvpdecode(uvp, c) /* decode (u',v') index */
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double uvp[2];
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int c;
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{
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int upper, lower;
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register int ui, vi;
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if (c < 0 || c >= UV_NDIVS)
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return(-1);
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lower = 0; /* binary search */
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upper = UV_NVS;
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do {
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vi = (lower + upper) >> 1;
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ui = c - uv_row[vi].ncum;
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if (ui > 0)
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lower = vi;
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else if (ui < 0)
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upper = vi;
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else
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break;
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} while (upper - lower > 1);
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vi = lower;
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ui = c - uv_row[vi].ncum;
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uvp[0] = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
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uvp[1] = UV_VSTART + (vi+.5)*UV_SQSIZ;
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return(0);
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}
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int
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tmCvLuv32(ls, cs, luvs, len) /* convert raw 32-bit LogLuv values */
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TMbright *ls;
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BYTE *cs;
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uint32 *luvs;
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int len;
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{
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static char funcName[] = "tmCvLuv32";
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double uvp[2];
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register LUV32DATA *ld;
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register int i, j;
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/* check arguments */
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if (tmTop == NULL)
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returnErr(TM_E_TMINVAL);
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if (ls == NULL | luvs == NULL | len < 0)
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returnErr(TM_E_ILLEGAL);
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/* check package registration */
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if (luv32Reg < 0 && (luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
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returnErr(TM_E_CODERR1);
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/* get package data */
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if ((ld = (LUV32DATA *)tmPkgData(tmTop,luv32Reg)) == NULL)
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returnErr(TM_E_NOMEM);
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/* convert each pixel */
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for (i = len; i--; ) {
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j = luvs[i] >> 16; /* get luminance */
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if (j & 0x8000) /* negative luminance */
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ls[i] = MINBRT-1; /* assign bogus value */
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else /* else convert to lnL */
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ls[i] = (BRT2SCALE*j >> 8) - ld->offset;
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if (cs == TM_NOCHROM) /* no color? */
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continue;
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/* get chrominance */
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if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
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uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
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uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
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ls[i] = compmeshift(ls[i], uvp);
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j = tmTop->flags & TM_F_BW || ls[i] < BMESLOWER
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? UVNEU
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: (int)(uvp[0]*UVSCALE)<<8
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| (int)(uvp[1]*UVSCALE);
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} else {
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j = tmTop->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
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}
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if (!isuvset(ld, j)) {
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uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
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uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
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uv2rgb(ld->rgbval[j], tmTop, uvp);
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setuv(ld, j);
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}
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cs[3*i ] = ld->rgbval[j][RED];
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cs[3*i+1] = ld->rgbval[j][GRN];
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cs[3*i+2] = ld->rgbval[j][BLU];
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}
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returnOK;
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}
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int
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tmCvLuv24(ls, cs, luvs, len) /* convert raw 24-bit LogLuv values */
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TMbright *ls;
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BYTE *cs;
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uint32 *luvs;
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int len;
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{
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char funcName[] = "tmCvLuv24";
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double uvp[2];
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register LUV24DATA *ld;
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register int i, j;
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/* check arguments */
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if (tmTop == NULL)
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returnErr(TM_E_TMINVAL);
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if (ls == NULL | luvs == NULL | len < 0)
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returnErr(TM_E_ILLEGAL);
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/* check package registration */
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if (luv24Reg < 0 && (luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
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returnErr(TM_E_CODERR1);
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/* get package data */
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if ((ld = (LUV24DATA *)tmPkgData(tmTop,luv24Reg)) == NULL)
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returnErr(TM_E_NOMEM);
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/* convert each pixel */
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for (i = len; i--; ) {
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j = luvs[i] >> 14; /* get luminance */
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ls[i] = (BRT2SCALE*j >> 6) - ld->offset;
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if (cs == TM_NOCHROM) /* no color? */
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continue;
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/* get chrominance */
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if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
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if (uvpdecode(uvp, luvs[i]&0x3fff) < 0) {
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uvp[0] = U_NEU; /* should barf? */
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uvp[1] = V_NEU;
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}
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ls[i] = compmeshift(ls[i], uvp);
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if (tmTop->flags & TM_F_BW || ls[i] < BMESLOWER
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|| (j = uvpencode(uvp)) < 0)
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j = uv14neu;
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} else {
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j = tmTop->flags&TM_F_BW ? uv14neu : luvs[i]&0x3fff;
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}
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if (!isuvset(ld, j)) {
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if (uvpdecode(uvp, j) < 0) {
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uvp[0] = U_NEU;
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uvp[1] = V_NEU;
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}
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uv2rgb(ld->rgbval[j], tmTop, uvp);
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setuv(ld, j);
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}
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cs[3*i ] = ld->rgbval[j][RED];
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cs[3*i+1] = ld->rgbval[j][GRN];
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cs[3*i+2] = ld->rgbval[j][BLU];
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}
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returnOK;
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}
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| 266 |
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int
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tmCvL16(ls, l16s, len) /* convert 16-bit LogL values */
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| 268 |
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TMbright *ls;
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| 269 |
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uint16 *l16s;
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| 270 |
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int len;
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| 271 |
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{
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| 272 |
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static char funcName[] = "tmCvL16";
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| 273 |
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static double lastsf;
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| 274 |
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static int offset;
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| 275 |
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register int i;
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| 276 |
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/* check arguments */
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| 277 |
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if (tmTop == NULL)
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| 278 |
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returnErr(TM_E_TMINVAL);
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| 279 |
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if (ls == NULL | l16s == NULL | len < 0)
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| 280 |
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returnErr(TM_E_ILLEGAL);
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| 281 |
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/* check scaling offset */
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| 282 |
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if (!FEQ(tmTop->inpsf, lastsf)) {
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| 283 |
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offset = BRT2SCALE*64;
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| 284 |
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if (tmTop->inpsf > 1.0001)
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| 285 |
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
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| 286 |
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else if (tmTop->inpsf < 0.9999)
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| 287 |
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
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| 288 |
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lastsf = tmTop->inpsf;
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| 289 |
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}
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| 290 |
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/* convert each pixel */
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| 291 |
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for (i = len; i--; ) {
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| 292 |
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if (l16s[i] & 0x8000) /* negative luminance */
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| 293 |
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ls[i] = MINBRT-1; /* assign bogus value */
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| 294 |
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else /* else convert to lnL */
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| 295 |
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ls[i] = (BRT2SCALE*l16s[i] >> 8) - offset;
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| 296 |
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}
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| 297 |
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returnOK;
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| 298 |
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}
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| 299 |
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| 300 |
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| 301 |
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static void
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| 302 |
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luv32NewSpace(tm) /* initialize 32-bit LogLuv color space */
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| 303 |
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struct tmStruct *tm;
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| 304 |
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{
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| 305 |
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register LUV32DATA *ld;
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| 306 |
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| 307 |
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if (tm->inppri != TM_XYZPRIM) { /* panic time! */
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| 308 |
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fputs("Improper input color space in luv32NewSpace!\n", stderr);
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| 309 |
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exit(1);
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| 310 |
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}
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| 311 |
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ld = (LUV32DATA *)tm->pd[luv32Reg];
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| 312 |
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ld->offset = BRT2SCALE*64;
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| 313 |
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if (tm->inpsf > 1.0001)
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| 314 |
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ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
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| 315 |
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else if (tm->inpsf < 0.9999)
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| 316 |
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ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
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| 317 |
|
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clruvall(ld);
|
| 318 |
|
|
}
|
| 319 |
|
|
|
| 320 |
|
|
|
| 321 |
|
|
static MEM_PTR
|
| 322 |
|
|
luv32Init(tm) /* allocate data for 32-bit LogLuv decoder */
|
| 323 |
|
|
struct tmStruct *tm;
|
| 324 |
|
|
{
|
| 325 |
|
|
register LUV32DATA *ld;
|
| 326 |
|
|
|
| 327 |
|
|
ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
|
| 328 |
|
|
if (ld == NULL)
|
| 329 |
|
|
return(NULL);
|
| 330 |
|
|
tm->pd[luv32Reg] = (MEM_PTR)ld;
|
| 331 |
|
|
luv32NewSpace(tm);
|
| 332 |
|
|
return((MEM_PTR)ld);
|
| 333 |
|
|
}
|
| 334 |
|
|
|
| 335 |
|
|
|
| 336 |
|
|
static void
|
| 337 |
|
|
luv24NewSpace(tm) /* initialize 24-bit LogLuv color space */
|
| 338 |
|
|
struct tmStruct *tm;
|
| 339 |
|
|
{
|
| 340 |
|
|
register LUV24DATA *ld;
|
| 341 |
|
|
double uvp[2];
|
| 342 |
|
|
|
| 343 |
|
|
if (tm->inppri != TM_XYZPRIM) { /* panic time! */
|
| 344 |
|
|
fputs("Improper input color space in luv24NewSpace!\n", stderr);
|
| 345 |
|
|
exit(1);
|
| 346 |
|
|
}
|
| 347 |
|
|
ld = (LUV24DATA *)tm->pd[luv24Reg];
|
| 348 |
|
|
ld->offset = BRT2SCALE*12;
|
| 349 |
|
|
if (tm->inpsf > 1.0001)
|
| 350 |
|
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
|
| 351 |
|
|
else if (tm->inpsf < 0.9999)
|
| 352 |
|
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
|
| 353 |
|
|
clruvall(ld);
|
| 354 |
|
|
}
|
| 355 |
|
|
|
| 356 |
|
|
|
| 357 |
|
|
static MEM_PTR
|
| 358 |
|
|
luv24Init(tm) /* allocate data for 24-bit LogLuv decoder */
|
| 359 |
|
|
struct tmStruct *tm;
|
| 360 |
|
|
{
|
| 361 |
|
|
register LUV24DATA *ld;
|
| 362 |
|
|
|
| 363 |
|
|
ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
|
| 364 |
|
|
if (ld == NULL)
|
| 365 |
|
|
return(NULL);
|
| 366 |
|
|
tm->pd[luv24Reg] = (MEM_PTR)ld;
|
| 367 |
|
|
if (uv14neu < 0) { /* initialize neutral color index */
|
| 368 |
|
|
double uvp[2];
|
| 369 |
|
|
uvp[0] = U_NEU; uvp[1] = V_NEU;
|
| 370 |
|
|
uv14neu = uvpencode(uvp);
|
| 371 |
|
|
}
|
| 372 |
|
|
luv24NewSpace(tm);
|
| 373 |
|
|
return((MEM_PTR)ld);
|
| 374 |
|
|
}
|
