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#ifndef lint |
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static const char RCSid[] = "$Id: tmapluv.c,v 3.11 2005/01/07 21:41:06 greg Exp $"; |
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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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* Externals declared in tmaptiff.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#define LOGLUV_PUBLIC 1 |
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|
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#include <stdio.h> |
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#include <string.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 "tmaptiff.h" |
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|
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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) memset((MEM_PTR)(p)->rgbflg,'\0',sizeof((p)->rgbflg)) |
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|
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#ifdef NOPROTO |
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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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#else |
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static MEM_PTR luv32Init(TMstruct *); |
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static void luv32NewSpace(TMstruct *); |
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static MEM_PTR luv24Init(TMstruct *); |
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static void luv24NewSpace(TMstruct *); |
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#endif |
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|
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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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|
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#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \ |
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| (int)(UVSCALE*V_NEU)) |
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|
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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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|
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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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|
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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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|
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static int uv14neu = -1; /* neutral index for 14-bit (u',v') */ |
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|
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|
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static void |
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uv2rgb(rgb, tms, uvp) /* compute RGB from uv coordinate */ |
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BYTE rgb[3]; |
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register TMstruct *tms; |
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double uvp[2]; |
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{ /* Should check that tms->inppri==TM_XYZPRIM beforehand... */ |
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double d, x, y; |
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COLOR 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./tms->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, tms->cmat, XYZ); |
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clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite); |
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/* perform final scaling & gamma */ |
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d = tms->clf[RED] * RGB[RED]; |
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rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam)); |
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d = tms->clf[GRN] * RGB[GRN]; |
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rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam)); |
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d = tms->clf[BLU] * RGB[BLU]; |
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rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam)); |
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} |
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|
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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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double scotrat; |
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register double d; |
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|
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if (li >= BMESUPPER) |
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return(li); |
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scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343; |
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if (li <= BMESLOWER) { |
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d = 0.; |
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uvp[0] = U_NEU; uvp[1] = V_NEU; |
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} else { |
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d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.); |
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uvp[0] = d*uvp[0] + (1.-d)*U_NEU; |
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uvp[1] = d*uvp[1] + (1.-d)*V_NEU; |
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} |
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/* |
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d = li + (double)TM_BRTSCALE*log(d + (1.-d)*scotrat); |
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*/ |
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d = d + (1.-d)*scotrat; |
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d -= 1.; /* Taylor expansion of log(x) about 1 */ |
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d = d*(1. + d*(-.5 + d*(1./3. + d*-.125))); |
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d = li + (double)TM_BRTSCALE*d; |
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return((TMbright)(d>0. ? d+.5 : d-.5)); |
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} |
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|
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|
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int |
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tmCvLuv32( /* convert raw 32-bit LogLuv values */ |
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TMstruct *tms, |
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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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{ |
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static const 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 (tms == 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) { |
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if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0) |
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returnErr(TM_E_CODERR1); |
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tmMkMesofact(); |
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} |
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/* get package data */ |
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if ((ld = (LUV32DATA *)tmPkgData(tms,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] = TM_NOBRT; /* 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 (tms->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 = tms->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 = tms->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*((j>>8) + .5); |
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uvp[1] = 1./UVSCALE*((j & 0xff) + .5); |
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uv2rgb(ld->rgbval[j], tms, 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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|
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|
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int |
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tmCvLuv24( /* convert raw 24-bit LogLuv values */ |
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TMstruct *tms, |
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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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{ |
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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 (tms == 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) { |
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if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0) |
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returnErr(TM_E_CODERR1); |
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tmMkMesofact(); |
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} |
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/* get package data */ |
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if ((ld = (LUV24DATA *)tmPkgData(tms,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 (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) { |
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if (uv_decode(&uvp[0], &uvp[1], 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 (tms->flags&TM_F_BW || ls[i]<BMESLOWER |
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|| (j = uv_encode(uvp[0], uvp[1], |
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SGILOGENCODE_NODITHER)) < 0) |
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j = uv14neu; |
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} else { |
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j = tms->flags&TM_F_BW ? uv14neu : |
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(int)(luvs[i]&0x3fff); |
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} |
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if (!isuvset(ld, j)) { |
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if (uv_decode(&uvp[0], &uvp[1], j) < 0) { |
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uvp[0] = U_NEU; uvp[1] = V_NEU; |
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} |
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uv2rgb(ld->rgbval[j], tms, 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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|
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|
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int |
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tmCvL16( /* convert 16-bit LogL values */ |
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TMstruct *tms, |
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TMbright *ls, |
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uint16 *l16s, |
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int len |
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) |
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{ |
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static const char funcName[] = "tmCvL16"; |
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static double lastsf; |
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static int offset; |
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register int i; |
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/* check arguments */ |
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if (tms == NULL) |
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returnErr(TM_E_TMINVAL); |
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if ((ls == NULL) | (l16s == NULL) | (len < 0)) |
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returnErr(TM_E_ILLEGAL); |
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/* check scaling offset */ |
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if (!FEQ(tms->inpsf, lastsf)) { |
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offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf); |
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lastsf = tms->inpsf; |
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} |
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/* convert each pixel */ |
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for (i = len; i--; ) { |
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if (l16s[i] & 0x8000) /* negative luminance */ |
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ls[i] = TM_NOBRT; /* assign bogus value */ |
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else /* else convert to lnL */ |
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ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset; |
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} |
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returnOK; |
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} |
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|
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|
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static void |
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luv32NewSpace(tms) /* initialize 32-bit LogLuv color space */ |
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TMstruct *tms; |
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{ |
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register LUV32DATA *ld; |
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|
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if (tms->inppri != TM_XYZPRIM) { /* panic time! */ |
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fputs("Improper input color space in luv32NewSpace!\n", stderr); |
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exit(1); |
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} |
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ld = (LUV32DATA *)tms->pd[luv32Reg]; |
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ld->offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf); |
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clruvall(ld); |
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} |
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|
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|
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static MEM_PTR |
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luv32Init(tms) /* allocate data for 32-bit LogLuv decoder */ |
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TMstruct *tms; |
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{ |
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register LUV32DATA *ld; |
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|
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ld = (LUV32DATA *)malloc(sizeof(LUV32DATA)); |
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if (ld == NULL) |
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return(NULL); |
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tms->pd[luv32Reg] = (MEM_PTR)ld; |
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luv32NewSpace(tms); |
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return((MEM_PTR)ld); |
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} |
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|
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|
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static void |
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luv24NewSpace(tms) /* initialize 24-bit LogLuv color space */ |
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TMstruct *tms; |
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{ |
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register LUV24DATA *ld; |
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|
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if (tms->inppri != TM_XYZPRIM) { /* panic time! */ |
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fputs("Improper input color space in luv24NewSpace!\n", stderr); |
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exit(1); |
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} |
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ld = (LUV24DATA *)tms->pd[luv24Reg]; |
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ld->offset = BRT2SCALE(12) - tmCvLuminance(tms->inpsf); |
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clruvall(ld); |
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} |
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|
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|
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static MEM_PTR |
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luv24Init(tms) /* allocate data for 24-bit LogLuv decoder */ |
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TMstruct *tms; |
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{ |
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register LUV24DATA *ld; |
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|
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ld = (LUV24DATA *)malloc(sizeof(LUV24DATA)); |
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if (ld == NULL) |
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return(NULL); |
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tms->pd[luv24Reg] = (MEM_PTR)ld; |
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if (uv14neu < 0) /* initialize neutral color index */ |
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uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
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luv24NewSpace(tms); |
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return((MEM_PTR)ld); |
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} |
