| 1 |
gwlarson |
3.1 |
#ifndef lint |
| 2 |
greg |
3.8 |
static const char RCSid[] = "$Id: tmapluv.c,v 3.7 2003/07/01 16:20:04 greg Exp $"; |
| 3 |
gwlarson |
3.1 |
#endif |
| 4 |
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/* |
| 5 |
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* Routines for tone-mapping LogLuv encoded pixels. |
| 6 |
greg |
3.4 |
* |
| 7 |
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* Externals declared in tmaptiff.h |
| 8 |
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*/ |
| 9 |
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| 10 |
greg |
3.5 |
#include "copyright.h" |
| 11 |
gwlarson |
3.1 |
|
| 12 |
greg |
3.4 |
#define LOGLUV_PUBLIC 1 |
| 13 |
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| 14 |
gwlarson |
3.1 |
#include <stdio.h> |
| 15 |
greg |
3.4 |
#include <string.h> |
| 16 |
gwlarson |
3.1 |
#include <math.h> |
| 17 |
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#include "tiffio.h" |
| 18 |
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#include "tmprivat.h" |
| 19 |
greg |
3.4 |
#include "tmaptiff.h" |
| 20 |
gwlarson |
3.1 |
|
| 21 |
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#define uvflgop(p,uv,op) ((p)->rgbflg[(uv)>>5] op (1L<<((uv)&0x1f))) |
| 22 |
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#define isuvset(p,uv) uvflgop(p,uv,&) |
| 23 |
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#define setuv(p,uv) uvflgop(p,uv,|=) |
| 24 |
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#define clruv(p,uv) uvflgop(p,uv,&=~) |
| 25 |
schorsch |
3.6 |
#define clruvall(p) memset((MEM_PTR)(p)->rgbflg,'\0',sizeof((p)->rgbflg)) |
| 26 |
gwlarson |
3.1 |
|
| 27 |
greg |
3.4 |
#ifdef NOPROTO |
| 28 |
gwlarson |
3.1 |
static MEM_PTR luv32Init(); |
| 29 |
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static void luv32NewSpace(); |
| 30 |
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static MEM_PTR luv24Init(); |
| 31 |
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static void luv24NewSpace(); |
| 32 |
greg |
3.4 |
#else |
| 33 |
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static MEM_PTR luv32Init(struct tmStruct *); |
| 34 |
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static void luv32NewSpace(struct tmStruct *); |
| 35 |
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static MEM_PTR luv24Init(struct tmStruct *); |
| 36 |
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static void luv24NewSpace(struct tmStruct *); |
| 37 |
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#endif |
| 38 |
gwlarson |
3.1 |
|
| 39 |
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typedef struct { |
| 40 |
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int offset; /* computed luminance offset */ |
| 41 |
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BYTE rgbval[1<<16][3]; /* computed RGB value for given uv */ |
| 42 |
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uint32 rgbflg[1<<(16-5)]; /* flags for computed values */ |
| 43 |
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} LUV32DATA; /* LogLuv 32-bit conversion data */ |
| 44 |
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| 45 |
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#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \ |
| 46 |
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| (int)(UVSCALE*V_NEU)) |
| 47 |
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| 48 |
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static struct tmPackage luv32Pkg = { /* 32-bit package functions */ |
| 49 |
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luv32Init, luv32NewSpace, free |
| 50 |
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}; |
| 51 |
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static int luv32Reg = -1; /* 32-bit package reg. number */ |
| 52 |
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| 53 |
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typedef struct { |
| 54 |
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int offset; /* computed luminance offset */ |
| 55 |
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BYTE rgbval[1<<14][3]; /* computed rgb value for uv index */ |
| 56 |
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uint32 rgbflg[1<<(14-5)]; /* flags for computed values */ |
| 57 |
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} LUV24DATA; /* LogLuv 24-bit conversion data */ |
| 58 |
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| 59 |
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static struct tmPackage luv24Pkg = { /* 24-bit package functions */ |
| 60 |
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luv24Init, luv24NewSpace, free |
| 61 |
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}; |
| 62 |
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static int luv24Reg = -1; /* 24-bit package reg. number */ |
| 63 |
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| 64 |
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static int uv14neu = -1; /* neutral index for 14-bit (u',v') */ |
| 65 |
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| 66 |
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| 67 |
greg |
3.4 |
static void |
| 68 |
gwlarson |
3.1 |
uv2rgb(rgb, tm, uvp) /* compute RGB from uv coordinate */ |
| 69 |
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BYTE rgb[3]; |
| 70 |
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register struct tmStruct *tm; |
| 71 |
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double uvp[2]; |
| 72 |
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{ /* Should check that tm->inppri==TM_XYZPRIM beforehand... */ |
| 73 |
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double d, x, y; |
| 74 |
gwlarson |
3.2 |
COLOR XYZ, RGB; |
| 75 |
gwlarson |
3.1 |
/* convert to XYZ */ |
| 76 |
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d = 1./(6.*uvp[0] - 16.*uvp[1] + 12.); |
| 77 |
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x = 9.*uvp[0] * d; |
| 78 |
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y = 4.*uvp[1] * d; |
| 79 |
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XYZ[CIEY] = 1./tm->inpsf; |
| 80 |
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XYZ[CIEX] = x/y * XYZ[CIEY]; |
| 81 |
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XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY]; |
| 82 |
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/* convert to RGB and clip */ |
| 83 |
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colortrans(RGB, tm->cmat, XYZ); |
| 84 |
greg |
3.4 |
clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite); |
| 85 |
gwlarson |
3.1 |
/* perform final scaling & gamma */ |
| 86 |
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d = tm->clf[RED] * RGB[RED]; |
| 87 |
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rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam)); |
| 88 |
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d = tm->clf[GRN] * RGB[GRN]; |
| 89 |
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rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam)); |
| 90 |
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d = tm->clf[BLU] * RGB[BLU]; |
| 91 |
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rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam)); |
| 92 |
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} |
| 93 |
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| 94 |
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| 95 |
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static TMbright |
| 96 |
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compmeshift(li, uvp) /* compute mesopic color shift */ |
| 97 |
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TMbright li; /* encoded world luminance */ |
| 98 |
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double uvp[2]; /* world (u',v') -> returned desaturated */ |
| 99 |
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{ |
| 100 |
greg |
3.4 |
double scotrat; |
| 101 |
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register double d; |
| 102 |
gwlarson |
3.2 |
|
| 103 |
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if (li >= BMESUPPER) |
| 104 |
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return(li); |
| 105 |
greg |
3.4 |
scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343; |
| 106 |
gwlarson |
3.2 |
if (li <= BMESLOWER) { |
| 107 |
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d = 0.; |
| 108 |
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uvp[0] = U_NEU; uvp[1] = V_NEU; |
| 109 |
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} else { |
| 110 |
greg |
3.4 |
d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.); |
| 111 |
gwlarson |
3.2 |
uvp[0] = d*uvp[0] + (1.-d)*U_NEU; |
| 112 |
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uvp[1] = d*uvp[1] + (1.-d)*V_NEU; |
| 113 |
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} |
| 114 |
greg |
3.4 |
/* |
| 115 |
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d = li + (double)TM_BRTSCALE*log(d + (1.-d)*scotrat); |
| 116 |
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*/ |
| 117 |
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d = d + (1.-d)*scotrat; |
| 118 |
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d -= 1.; /* Taylor expansion of log(x) about 1 */ |
| 119 |
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d = d*(1. + d*(-.5 + d*(1./3. + d*-.125))); |
| 120 |
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d = li + (double)TM_BRTSCALE*d; |
| 121 |
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return((TMbright)(d>0. ? d+.5 : d-.5)); |
| 122 |
gwlarson |
3.1 |
} |
| 123 |
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| 124 |
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| 125 |
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int |
| 126 |
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tmCvLuv32(ls, cs, luvs, len) /* convert raw 32-bit LogLuv values */ |
| 127 |
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TMbright *ls; |
| 128 |
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BYTE *cs; |
| 129 |
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uint32 *luvs; |
| 130 |
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int len; |
| 131 |
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{ |
| 132 |
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static char funcName[] = "tmCvLuv32"; |
| 133 |
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double uvp[2]; |
| 134 |
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register LUV32DATA *ld; |
| 135 |
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register int i, j; |
| 136 |
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/* check arguments */ |
| 137 |
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if (tmTop == NULL) |
| 138 |
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returnErr(TM_E_TMINVAL); |
| 139 |
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if (ls == NULL | luvs == NULL | len < 0) |
| 140 |
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returnErr(TM_E_ILLEGAL); |
| 141 |
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/* check package registration */ |
| 142 |
greg |
3.4 |
if (luv32Reg < 0) { |
| 143 |
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if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0) |
| 144 |
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returnErr(TM_E_CODERR1); |
| 145 |
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tmMkMesofact(); |
| 146 |
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} |
| 147 |
gwlarson |
3.1 |
/* get package data */ |
| 148 |
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if ((ld = (LUV32DATA *)tmPkgData(tmTop,luv32Reg)) == NULL) |
| 149 |
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returnErr(TM_E_NOMEM); |
| 150 |
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/* convert each pixel */ |
| 151 |
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for (i = len; i--; ) { |
| 152 |
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j = luvs[i] >> 16; /* get luminance */ |
| 153 |
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if (j & 0x8000) /* negative luminance */ |
| 154 |
gwlarson |
3.3 |
ls[i] = TM_NOBRT; /* assign bogus value */ |
| 155 |
gwlarson |
3.1 |
else /* else convert to lnL */ |
| 156 |
greg |
3.4 |
ls[i] = (BRT2SCALE(j) >> 8) - ld->offset; |
| 157 |
gwlarson |
3.1 |
if (cs == TM_NOCHROM) /* no color? */ |
| 158 |
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continue; |
| 159 |
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/* get chrominance */ |
| 160 |
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if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) { |
| 161 |
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uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5); |
| 162 |
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uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5); |
| 163 |
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ls[i] = compmeshift(ls[i], uvp); |
| 164 |
gwlarson |
3.2 |
j = tmTop->flags&TM_F_BW || ls[i]<BMESLOWER |
| 165 |
gwlarson |
3.1 |
? UVNEU |
| 166 |
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: (int)(uvp[0]*UVSCALE)<<8 |
| 167 |
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| (int)(uvp[1]*UVSCALE); |
| 168 |
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} else { |
| 169 |
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j = tmTop->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff; |
| 170 |
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} |
| 171 |
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if (!isuvset(ld, j)) { |
| 172 |
greg |
3.4 |
uvp[0] = 1./UVSCALE*((j>>8) + .5); |
| 173 |
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uvp[1] = 1./UVSCALE*((j & 0xff) + .5); |
| 174 |
gwlarson |
3.1 |
uv2rgb(ld->rgbval[j], tmTop, uvp); |
| 175 |
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setuv(ld, j); |
| 176 |
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} |
| 177 |
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cs[3*i ] = ld->rgbval[j][RED]; |
| 178 |
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cs[3*i+1] = ld->rgbval[j][GRN]; |
| 179 |
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cs[3*i+2] = ld->rgbval[j][BLU]; |
| 180 |
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} |
| 181 |
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returnOK; |
| 182 |
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} |
| 183 |
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| 184 |
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| 185 |
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int |
| 186 |
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tmCvLuv24(ls, cs, luvs, len) /* convert raw 24-bit LogLuv values */ |
| 187 |
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TMbright *ls; |
| 188 |
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BYTE *cs; |
| 189 |
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uint32 *luvs; |
| 190 |
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int len; |
| 191 |
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{ |
| 192 |
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char funcName[] = "tmCvLuv24"; |
| 193 |
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double uvp[2]; |
| 194 |
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register LUV24DATA *ld; |
| 195 |
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register int i, j; |
| 196 |
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/* check arguments */ |
| 197 |
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if (tmTop == NULL) |
| 198 |
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returnErr(TM_E_TMINVAL); |
| 199 |
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if (ls == NULL | luvs == NULL | len < 0) |
| 200 |
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returnErr(TM_E_ILLEGAL); |
| 201 |
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/* check package registration */ |
| 202 |
greg |
3.4 |
if (luv24Reg < 0) { |
| 203 |
|
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if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0) |
| 204 |
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returnErr(TM_E_CODERR1); |
| 205 |
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tmMkMesofact(); |
| 206 |
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} |
| 207 |
gwlarson |
3.1 |
/* get package data */ |
| 208 |
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if ((ld = (LUV24DATA *)tmPkgData(tmTop,luv24Reg)) == NULL) |
| 209 |
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returnErr(TM_E_NOMEM); |
| 210 |
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/* convert each pixel */ |
| 211 |
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for (i = len; i--; ) { |
| 212 |
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j = luvs[i] >> 14; /* get luminance */ |
| 213 |
greg |
3.4 |
ls[i] = (BRT2SCALE(j) >> 6) - ld->offset; |
| 214 |
gwlarson |
3.1 |
if (cs == TM_NOCHROM) /* no color? */ |
| 215 |
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continue; |
| 216 |
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/* get chrominance */ |
| 217 |
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if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) { |
| 218 |
greg |
3.8 |
if (uv_decode(&uvp[0], &uvp[1], luvs[i]&0x3fff) < 0) { |
| 219 |
gwlarson |
3.1 |
uvp[0] = U_NEU; /* should barf? */ |
| 220 |
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uvp[1] = V_NEU; |
| 221 |
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} |
| 222 |
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ls[i] = compmeshift(ls[i], uvp); |
| 223 |
gwlarson |
3.2 |
if (tmTop->flags&TM_F_BW || ls[i]<BMESLOWER |
| 224 |
greg |
3.4 |
|| (j = uv_encode(uvp[0], uvp[1], |
| 225 |
|
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SGILOGENCODE_NODITHER)) < 0) |
| 226 |
gwlarson |
3.1 |
j = uv14neu; |
| 227 |
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} else { |
| 228 |
greg |
3.7 |
j = tmTop->flags&TM_F_BW ? uv14neu : |
| 229 |
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(int)(luvs[i]&0x3fff); |
| 230 |
gwlarson |
3.1 |
} |
| 231 |
|
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if (!isuvset(ld, j)) { |
| 232 |
greg |
3.4 |
if (uv_decode(&uvp[0], &uvp[1], j) < 0) { |
| 233 |
gwlarson |
3.2 |
uvp[0] = U_NEU; uvp[1] = V_NEU; |
| 234 |
gwlarson |
3.1 |
} |
| 235 |
|
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uv2rgb(ld->rgbval[j], tmTop, uvp); |
| 236 |
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setuv(ld, j); |
| 237 |
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} |
| 238 |
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cs[3*i ] = ld->rgbval[j][RED]; |
| 239 |
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cs[3*i+1] = ld->rgbval[j][GRN]; |
| 240 |
|
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cs[3*i+2] = ld->rgbval[j][BLU]; |
| 241 |
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} |
| 242 |
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returnOK; |
| 243 |
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} |
| 244 |
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| 245 |
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| 246 |
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int |
| 247 |
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tmCvL16(ls, l16s, len) /* convert 16-bit LogL values */ |
| 248 |
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TMbright *ls; |
| 249 |
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uint16 *l16s; |
| 250 |
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int len; |
| 251 |
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{ |
| 252 |
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static char funcName[] = "tmCvL16"; |
| 253 |
|
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static double lastsf; |
| 254 |
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static int offset; |
| 255 |
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register int i; |
| 256 |
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/* check arguments */ |
| 257 |
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if (tmTop == NULL) |
| 258 |
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returnErr(TM_E_TMINVAL); |
| 259 |
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if (ls == NULL | l16s == NULL | len < 0) |
| 260 |
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returnErr(TM_E_ILLEGAL); |
| 261 |
|
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/* check scaling offset */ |
| 262 |
|
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if (!FEQ(tmTop->inpsf, lastsf)) { |
| 263 |
greg |
3.4 |
offset = BRT2SCALE(64); |
| 264 |
gwlarson |
3.1 |
if (tmTop->inpsf > 1.0001) |
| 265 |
|
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
| 266 |
|
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else if (tmTop->inpsf < 0.9999) |
| 267 |
|
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5); |
| 268 |
|
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lastsf = tmTop->inpsf; |
| 269 |
|
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} |
| 270 |
|
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/* convert each pixel */ |
| 271 |
|
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for (i = len; i--; ) { |
| 272 |
|
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if (l16s[i] & 0x8000) /* negative luminance */ |
| 273 |
gwlarson |
3.3 |
ls[i] = TM_NOBRT; /* assign bogus value */ |
| 274 |
gwlarson |
3.1 |
else /* else convert to lnL */ |
| 275 |
greg |
3.4 |
ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset; |
| 276 |
gwlarson |
3.1 |
} |
| 277 |
|
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returnOK; |
| 278 |
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} |
| 279 |
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| 280 |
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| 281 |
|
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static void |
| 282 |
|
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luv32NewSpace(tm) /* initialize 32-bit LogLuv color space */ |
| 283 |
|
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struct tmStruct *tm; |
| 284 |
|
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{ |
| 285 |
|
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register LUV32DATA *ld; |
| 286 |
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| 287 |
|
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if (tm->inppri != TM_XYZPRIM) { /* panic time! */ |
| 288 |
|
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fputs("Improper input color space in luv32NewSpace!\n", stderr); |
| 289 |
|
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exit(1); |
| 290 |
|
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} |
| 291 |
|
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ld = (LUV32DATA *)tm->pd[luv32Reg]; |
| 292 |
greg |
3.4 |
ld->offset = BRT2SCALE(64); |
| 293 |
gwlarson |
3.1 |
if (tm->inpsf > 1.0001) |
| 294 |
|
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ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
| 295 |
|
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else if (tm->inpsf < 0.9999) |
| 296 |
|
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ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5); |
| 297 |
|
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clruvall(ld); |
| 298 |
|
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} |
| 299 |
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| 300 |
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| 301 |
|
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static MEM_PTR |
| 302 |
|
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luv32Init(tm) /* allocate data for 32-bit LogLuv decoder */ |
| 303 |
|
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struct tmStruct *tm; |
| 304 |
|
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{ |
| 305 |
|
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register LUV32DATA *ld; |
| 306 |
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| 307 |
|
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ld = (LUV32DATA *)malloc(sizeof(LUV32DATA)); |
| 308 |
|
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if (ld == NULL) |
| 309 |
|
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return(NULL); |
| 310 |
|
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tm->pd[luv32Reg] = (MEM_PTR)ld; |
| 311 |
|
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luv32NewSpace(tm); |
| 312 |
|
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return((MEM_PTR)ld); |
| 313 |
|
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} |
| 314 |
|
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|
| 315 |
|
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|
| 316 |
|
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static void |
| 317 |
|
|
luv24NewSpace(tm) /* initialize 24-bit LogLuv color space */ |
| 318 |
|
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struct tmStruct *tm; |
| 319 |
|
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{ |
| 320 |
|
|
register LUV24DATA *ld; |
| 321 |
|
|
|
| 322 |
|
|
if (tm->inppri != TM_XYZPRIM) { /* panic time! */ |
| 323 |
|
|
fputs("Improper input color space in luv24NewSpace!\n", stderr); |
| 324 |
|
|
exit(1); |
| 325 |
|
|
} |
| 326 |
|
|
ld = (LUV24DATA *)tm->pd[luv24Reg]; |
| 327 |
greg |
3.4 |
ld->offset = BRT2SCALE(12); |
| 328 |
gwlarson |
3.1 |
if (tm->inpsf > 1.0001) |
| 329 |
|
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
| 330 |
|
|
else if (tm->inpsf < 0.9999) |
| 331 |
|
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5); |
| 332 |
|
|
clruvall(ld); |
| 333 |
|
|
} |
| 334 |
|
|
|
| 335 |
|
|
|
| 336 |
|
|
static MEM_PTR |
| 337 |
|
|
luv24Init(tm) /* allocate data for 24-bit LogLuv decoder */ |
| 338 |
|
|
struct tmStruct *tm; |
| 339 |
|
|
{ |
| 340 |
|
|
register LUV24DATA *ld; |
| 341 |
|
|
|
| 342 |
|
|
ld = (LUV24DATA *)malloc(sizeof(LUV24DATA)); |
| 343 |
|
|
if (ld == NULL) |
| 344 |
|
|
return(NULL); |
| 345 |
|
|
tm->pd[luv24Reg] = (MEM_PTR)ld; |
| 346 |
greg |
3.4 |
if (uv14neu < 0) /* initialize neutral color index */ |
| 347 |
|
|
uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
| 348 |
gwlarson |
3.1 |
luv24NewSpace(tm); |
| 349 |
|
|
return((MEM_PTR)ld); |
| 350 |
|
|
} |
