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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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gwlarson |
3.2 |
COLOR XYZ, RGB; |
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gwlarson |
3.1 |
/* 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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gwlarson |
3.2 |
double scotrat, d; |
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if (li >= BMESUPPER) |
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return(li); |
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scotrat = 1.33/9.*(6.*uvp[0]-16.*uvp[1]+12.)/uvp[0] - 1.68; |
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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 = (tmLuminance(li) - LMESLOWER)/(LMESUPPER - LMESLOWER); |
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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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d = li + (double)TM_BRTSCALE*log(d + (1.-d)*scotrat/2.26); |
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return((TMbright)(d+.5)); |
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gwlarson |
3.1 |
} |
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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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gwlarson |
3.3 |
ls[i] = TM_NOBRT; /* assign bogus value */ |
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gwlarson |
3.1 |
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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gwlarson |
3.2 |
j = tmTop->flags&TM_F_BW || ls[i]<BMESLOWER |
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gwlarson |
3.1 |
? 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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gwlarson |
3.2 |
if (tmTop->flags&TM_F_BW || ls[i]<BMESLOWER |
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gwlarson |
3.1 |
|| (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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gwlarson |
3.2 |
uvp[0] = U_NEU; uvp[1] = V_NEU; |
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gwlarson |
3.1 |
} |
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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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tmCvL16(ls, l16s, len) /* convert 16-bit LogL values */ |
| 280 |
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TMbright *ls; |
| 281 |
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uint16 *l16s; |
| 282 |
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int len; |
| 283 |
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{ |
| 284 |
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static char funcName[] = "tmCvL16"; |
| 285 |
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static double lastsf; |
| 286 |
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static int offset; |
| 287 |
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register int i; |
| 288 |
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/* check arguments */ |
| 289 |
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if (tmTop == NULL) |
| 290 |
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returnErr(TM_E_TMINVAL); |
| 291 |
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if (ls == NULL | l16s == NULL | len < 0) |
| 292 |
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returnErr(TM_E_ILLEGAL); |
| 293 |
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/* check scaling offset */ |
| 294 |
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if (!FEQ(tmTop->inpsf, lastsf)) { |
| 295 |
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offset = BRT2SCALE*64; |
| 296 |
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if (tmTop->inpsf > 1.0001) |
| 297 |
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
| 298 |
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else if (tmTop->inpsf < 0.9999) |
| 299 |
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5); |
| 300 |
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lastsf = tmTop->inpsf; |
| 301 |
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} |
| 302 |
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/* convert each pixel */ |
| 303 |
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for (i = len; i--; ) { |
| 304 |
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if (l16s[i] & 0x8000) /* negative luminance */ |
| 305 |
gwlarson |
3.3 |
ls[i] = TM_NOBRT; /* assign bogus value */ |
| 306 |
gwlarson |
3.1 |
else /* else convert to lnL */ |
| 307 |
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ls[i] = (BRT2SCALE*l16s[i] >> 8) - offset; |
| 308 |
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} |
| 309 |
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returnOK; |
| 310 |
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} |
| 311 |
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| 312 |
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static void |
| 314 |
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luv32NewSpace(tm) /* initialize 32-bit LogLuv color space */ |
| 315 |
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struct tmStruct *tm; |
| 316 |
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{ |
| 317 |
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register LUV32DATA *ld; |
| 318 |
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| 319 |
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if (tm->inppri != TM_XYZPRIM) { /* panic time! */ |
| 320 |
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fputs("Improper input color space in luv32NewSpace!\n", stderr); |
| 321 |
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exit(1); |
| 322 |
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} |
| 323 |
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ld = (LUV32DATA *)tm->pd[luv32Reg]; |
| 324 |
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ld->offset = BRT2SCALE*64; |
| 325 |
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if (tm->inpsf > 1.0001) |
| 326 |
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ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
| 327 |
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else if (tm->inpsf < 0.9999) |
| 328 |
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ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5); |
| 329 |
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clruvall(ld); |
| 330 |
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} |
| 331 |
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| 332 |
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| 333 |
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static MEM_PTR |
| 334 |
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luv32Init(tm) /* allocate data for 32-bit LogLuv decoder */ |
| 335 |
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struct tmStruct *tm; |
| 336 |
|
|
{ |
| 337 |
|
|
register LUV32DATA *ld; |
| 338 |
|
|
|
| 339 |
|
|
ld = (LUV32DATA *)malloc(sizeof(LUV32DATA)); |
| 340 |
|
|
if (ld == NULL) |
| 341 |
|
|
return(NULL); |
| 342 |
|
|
tm->pd[luv32Reg] = (MEM_PTR)ld; |
| 343 |
|
|
luv32NewSpace(tm); |
| 344 |
|
|
return((MEM_PTR)ld); |
| 345 |
|
|
} |
| 346 |
|
|
|
| 347 |
|
|
|
| 348 |
|
|
static void |
| 349 |
|
|
luv24NewSpace(tm) /* initialize 24-bit LogLuv color space */ |
| 350 |
|
|
struct tmStruct *tm; |
| 351 |
|
|
{ |
| 352 |
|
|
register LUV24DATA *ld; |
| 353 |
|
|
double uvp[2]; |
| 354 |
|
|
|
| 355 |
|
|
if (tm->inppri != TM_XYZPRIM) { /* panic time! */ |
| 356 |
|
|
fputs("Improper input color space in luv24NewSpace!\n", stderr); |
| 357 |
|
|
exit(1); |
| 358 |
|
|
} |
| 359 |
|
|
ld = (LUV24DATA *)tm->pd[luv24Reg]; |
| 360 |
|
|
ld->offset = BRT2SCALE*12; |
| 361 |
|
|
if (tm->inpsf > 1.0001) |
| 362 |
|
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
| 363 |
|
|
else if (tm->inpsf < 0.9999) |
| 364 |
|
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5); |
| 365 |
|
|
clruvall(ld); |
| 366 |
|
|
} |
| 367 |
|
|
|
| 368 |
|
|
|
| 369 |
|
|
static MEM_PTR |
| 370 |
|
|
luv24Init(tm) /* allocate data for 24-bit LogLuv decoder */ |
| 371 |
|
|
struct tmStruct *tm; |
| 372 |
|
|
{ |
| 373 |
|
|
register LUV24DATA *ld; |
| 374 |
|
|
|
| 375 |
|
|
ld = (LUV24DATA *)malloc(sizeof(LUV24DATA)); |
| 376 |
|
|
if (ld == NULL) |
| 377 |
|
|
return(NULL); |
| 378 |
|
|
tm->pd[luv24Reg] = (MEM_PTR)ld; |
| 379 |
|
|
if (uv14neu < 0) { /* initialize neutral color index */ |
| 380 |
|
|
double uvp[2]; |
| 381 |
|
|
uvp[0] = U_NEU; uvp[1] = V_NEU; |
| 382 |
|
|
uv14neu = uvpencode(uvp); |
| 383 |
|
|
} |
| 384 |
|
|
luv24NewSpace(tm); |
| 385 |
|
|
return((MEM_PTR)ld); |
| 386 |
|
|
} |
