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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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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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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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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 "uvcode.h" |
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#include "tmaptiff.h" |
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|
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#ifndef BSD |
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#define bzero(d,n) (void)memset(d,0,n) |
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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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|
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#define U_NEU 0.210526316 |
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#define V_NEU 0.473684211 |
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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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extern void free(); |
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#else |
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static MEM_PTR luv32Init(struct tmStruct *); |
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static void luv32NewSpace(struct tmStruct *); |
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static MEM_PTR luv24Init(struct tmStruct *); |
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static void luv24NewSpace(struct 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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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 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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|
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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 |
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static void |
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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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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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clipgamut(RGB, 1., 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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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, d; |
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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 = 1.33/9.*(6.*uvp[0]-16.*uvp[1]+12.)/uvp[0] - 1.68; |
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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 = (tmLuminance(li) - LMESLOWER)/(LMESUPPER - LMESLOWER); |
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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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d = li + (double)TM_BRTSCALE*log(d + (1.-d)*scotrat/2.26); |
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return((TMbright)(d+.5)); |
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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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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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|
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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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|
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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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|
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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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|
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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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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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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(tmTop,luv32Reg)) == NULL) |
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returnErr(TM_E_NOMEM); |
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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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ls[i] = TM_NOBRT; /* assign bogus value */ |
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else /* else convert to lnL */ |
214 |
< |
ls[i] = (BRT2SCALE*j >> 8) - ld->offset; |
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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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j = tmTop->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff; |
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} |
229 |
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if (!isuvset(ld, j)) { |
230 |
< |
uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5); |
231 |
< |
uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5); |
230 |
> |
uvp[0] = 1./UVSCALE*((j>>8) + .5); |
231 |
> |
uvp[1] = 1./UVSCALE*((j & 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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if (ls == NULL | luvs == NULL | len < 0) |
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returnErr(TM_E_ILLEGAL); |
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/* check package registration */ |
260 |
< |
if (luv24Reg < 0 && (luv24Reg = tmRegPkg(&luv24Pkg)) < 0) |
261 |
< |
returnErr(TM_E_CODERR1); |
260 |
> |
if (luv24Reg < 0) { |
261 |
> |
if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0) |
262 |
> |
returnErr(TM_E_CODERR1); |
263 |
> |
tmMkMesofact(); |
264 |
> |
} |
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/* get package data */ |
266 |
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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--; ) { |
270 |
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j = luvs[i] >> 14; /* get luminance */ |
271 |
< |
ls[i] = (BRT2SCALE*j >> 6) - ld->offset; |
271 |
> |
ls[i] = (BRT2SCALE(j) >> 6) - ld->offset; |
272 |
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if (cs == TM_NOCHROM) /* no color? */ |
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continue; |
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/* get chrominance */ |
275 |
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if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) { |
276 |
< |
if (uvpdecode(uvp, luvs[i]&0x3fff) < 0) { |
276 |
> |
if (uv_decode(uvp, uvp+1, luvs[i]&0x3fff) < 0) { |
277 |
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uvp[0] = U_NEU; /* should barf? */ |
278 |
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uvp[1] = V_NEU; |
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} |
280 |
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ls[i] = compmeshift(ls[i], uvp); |
281 |
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if (tmTop->flags&TM_F_BW || ls[i]<BMESLOWER |
282 |
< |
|| (j = uvpencode(uvp)) < 0) |
282 |
> |
|| (j = uv_encode(uvp[0], uvp[1], |
283 |
> |
SGILOGENCODE_NODITHER)) < 0) |
284 |
|
j = uv14neu; |
285 |
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} else { |
286 |
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j = tmTop->flags&TM_F_BW ? uv14neu : luvs[i]&0x3fff; |
287 |
|
} |
288 |
|
if (!isuvset(ld, j)) { |
289 |
< |
if (uvpdecode(uvp, j) < 0) { |
289 |
> |
if (uv_decode(&uvp[0], &uvp[1], j) < 0) { |
290 |
|
uvp[0] = U_NEU; uvp[1] = V_NEU; |
291 |
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} |
292 |
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uv2rgb(ld->rgbval[j], tmTop, uvp); |
317 |
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returnErr(TM_E_ILLEGAL); |
318 |
|
/* check scaling offset */ |
319 |
|
if (!FEQ(tmTop->inpsf, lastsf)) { |
320 |
< |
offset = BRT2SCALE*64; |
320 |
> |
offset = BRT2SCALE(64); |
321 |
|
if (tmTop->inpsf > 1.0001) |
322 |
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offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
323 |
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else if (tmTop->inpsf < 0.9999) |
327 |
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/* convert each pixel */ |
328 |
|
for (i = len; i--; ) { |
329 |
|
if (l16s[i] & 0x8000) /* negative luminance */ |
330 |
< |
ls[i] = MINBRT-1; /* assign bogus value */ |
330 |
> |
ls[i] = TM_NOBRT; /* assign bogus value */ |
331 |
|
else /* else convert to lnL */ |
332 |
< |
ls[i] = (BRT2SCALE*l16s[i] >> 8) - offset; |
332 |
> |
ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset; |
333 |
|
} |
334 |
|
returnOK; |
335 |
|
} |
346 |
|
exit(1); |
347 |
|
} |
348 |
|
ld = (LUV32DATA *)tm->pd[luv32Reg]; |
349 |
< |
ld->offset = BRT2SCALE*64; |
349 |
> |
ld->offset = BRT2SCALE(64); |
350 |
|
if (tm->inpsf > 1.0001) |
351 |
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
352 |
|
else if (tm->inpsf < 0.9999) |
375 |
|
struct tmStruct *tm; |
376 |
|
{ |
377 |
|
register LUV24DATA *ld; |
353 |
– |
double uvp[2]; |
378 |
|
|
379 |
|
if (tm->inppri != TM_XYZPRIM) { /* panic time! */ |
380 |
|
fputs("Improper input color space in luv24NewSpace!\n", stderr); |
381 |
|
exit(1); |
382 |
|
} |
383 |
|
ld = (LUV24DATA *)tm->pd[luv24Reg]; |
384 |
< |
ld->offset = BRT2SCALE*12; |
384 |
> |
ld->offset = BRT2SCALE(12); |
385 |
|
if (tm->inpsf > 1.0001) |
386 |
|
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5); |
387 |
|
else if (tm->inpsf < 0.9999) |
400 |
|
if (ld == NULL) |
401 |
|
return(NULL); |
402 |
|
tm->pd[luv24Reg] = (MEM_PTR)ld; |
403 |
< |
if (uv14neu < 0) { /* initialize neutral color index */ |
404 |
< |
double uvp[2]; |
381 |
< |
uvp[0] = U_NEU; uvp[1] = V_NEU; |
382 |
< |
uv14neu = uvpencode(uvp); |
383 |
< |
} |
403 |
> |
if (uv14neu < 0) /* initialize neutral color index */ |
404 |
> |
uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
405 |
|
luv24NewSpace(tm); |
406 |
|
return((MEM_PTR)ld); |
407 |
|
} |