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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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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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* color.c - routines for color calculations. |
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* |
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* 10/10/85 |
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* Externals declared in color.h |
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*/ |
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|
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#include <stdio.h> |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <math.h> |
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#include "color.h" |
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|
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#ifdef SPEC_RGB |
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/* |
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* The following table contains the CIE tristimulus integrals |
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* for X, Y, and Z. The table is cumulative, so that |
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* each color coordinate integrates to 1. |
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*/ |
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#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
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#undef getc |
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#undef putc |
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#undef ferror |
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#define getc getc_unlocked |
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#define putc putc_unlocked |
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#define ferror ferror_unlocked |
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#endif |
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|
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#define STARTWL 380 /* starting wavelength (nanometers) */ |
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#define INCWL 10 /* wavelength increment */ |
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#define NINC 40 /* # of values */ |
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#define MINELEN 8 /* minimum scanline length for encoding */ |
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#define MAXELEN 0x7fff /* maximum scanline length for encoding */ |
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#define MINRUN 4 /* minimum run length */ |
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|
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static BYTE chroma[3][NINC] = { |
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{ /* X */ |
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0, 0, 0, 2, 6, 13, 22, 30, 36, 41, |
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42, 43, 43, 44, 46, 52, 60, 71, 87, 106, |
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128, 153, 178, 200, 219, 233, 243, 249, 252, 254, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255 |
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}, { /* Y */ |
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0, 0, 0, 0, 0, 1, 2, 4, 7, 11, |
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17, 24, 34, 48, 64, 84, 105, 127, 148, 169, |
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188, 205, 220, 232, 240, 246, 250, 253, 254, 255, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255 |
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}, { /* Z */ |
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0, 0, 2, 10, 32, 66, 118, 153, 191, 220, |
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237, 246, 251, 253, 254, 255, 255, 255, 255, 255, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, |
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255 |
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|
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int CNDX[4] = {0,1,2,3}; /* RGBE indices for SCOLOR, SCOLR */ |
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float WLPART[4] = {780,588,480,380}; /* RGB wavelength limits+partitions (nm) */ |
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|
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|
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int |
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setspectrsamp( /* assign spectral sampling, 1 if good, -1 if bad */ |
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int cn[4], /* input cn[3]=nsamps */ |
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float wlpt[4] /* input wlpt[0],wlpt[3]=extrema */ |
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) |
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{ |
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static const float PKWL[3] = {607, 553, 469}; |
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int i, j; |
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|
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if (cn[3] < 3) |
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return(-1); /* reject this */ |
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|
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if (wlpt[0] < wlpt[3]) { |
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float tf = wlpt[0]; |
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wlpt[0] = wlpt[3]; wlpt[3] = tf; |
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} |
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}; |
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if (wlpt[0] - wlpt[3] < 50.f) |
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return(-1); /* also reject */ |
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if (cn[3] > MAXCSAMP) |
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cn[3] = MAXCSAMP; |
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|
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spec_rgb(col, s, e) /* compute RGB color from spectral range */ |
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COLOR col; |
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int s, e; |
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if ((wlpt[3] >= PKWL[2]) | (wlpt[0] <= PKWL[0])) { |
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wlpt[1] = wlpt[0] + 0.333333f*(wlpt[3]-wlpt[0]); |
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wlpt[2] = wlpt[0] + 0.666667f*(wlpt[3]-wlpt[0]); |
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cn[0] = 0; cn[1] = cn[3]/3; cn[2] = cn[3]*2/3; |
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return(0); /* unhappy but non-fatal return value */ |
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} |
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wlpt[1] = 588.f; /* tuned for standard green channel */ |
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wlpt[2] = 480.f; |
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if (cn[3] == 3) { /* nothing to tune? */ |
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cn[0] = 0; cn[1] = 1; cn[2] = 2; |
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} else { /* else find nearest color indices */ |
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double curwl[3]; |
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memset(curwl, 0, sizeof(curwl)); |
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for (i = cn[3]; i--; ) { |
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const float cwl = (i+.5f)/cn[3]*(wlpt[3]-wlpt[0]) + wlpt[0]; |
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for (j = 3; j--; ) |
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if (fabs(cwl - PKWL[j]) < fabs(curwl[j] - PKWL[j])) { |
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curwl[j] = cwl; |
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cn[j] = i; |
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} |
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} |
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} |
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return(1); /* happy return value */ |
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} |
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|
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|
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void |
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setscolor( /* assign spectral color from RGB */ |
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SCOLOR scol, |
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double r, |
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double g, |
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double b |
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) |
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{ |
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COLOR ciecolor; |
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const double step = (WLPART[3] - WLPART[0])/(double)NCSAMP; |
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double cwl = WLPART[0] + .5*step; |
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int i; |
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|
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spec_cie(ciecolor, s, e); |
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cie_rgb(col, ciecolor); |
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for (i = 0; i < NCSAMP; i++) { |
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if (cwl >= WLPART[1]) |
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scol[i] = r; |
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else if (cwl >= WLPART[2]) |
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scol[i] = g; |
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else |
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scol[i] = b; |
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cwl += step; |
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} |
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} |
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spec_cie(col, s, e) /* compute a color from a spectral range */ |
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COLOR col; /* returned color */ |
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int s, e; /* starting and ending wavelengths */ |
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void |
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scolor2color( /* assign RGB color from spectrum */ |
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COLOR col, |
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SCOLOR scol, /* uses average over bands */ |
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int ncs, |
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float wlpt[4] |
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) |
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{ |
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register int i, d, r; |
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|
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s -= STARTWL; |
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if (s < 0) |
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s = 0; |
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const double step = (wlpt[3] - wlpt[0])/(double)ncs; |
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double cwl = wlpt[0] + .5*step; |
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int i, j=0, n=0; |
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|
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e -= STARTWL; |
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if (e >= INCWL*(NINC - 1)) |
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e = INCWL*(NINC - 1) - 1; |
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setcolor(col, 0, 0, 0); |
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for (i = 0; i < ncs; i++) { |
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if (cwl < wlpt[j+1]) { |
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if (n > 1) col[j] /= (COLORV)n; |
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j++; |
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n = 0; |
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} |
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col[j] += scol[i]; |
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n++; |
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cwl += step; |
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} |
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if (n > 1) col[j] /= (COLORV)n; |
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} |
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d = e / INCWL; /* interpolate values */ |
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r = e % INCWL; |
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for (i = 0; i < 3; i++) |
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col[i] = chroma[i][d]*(INCWL - r) + chroma[i][d + 1]*r; |
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d = s / INCWL; |
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r = s % INCWL; |
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for (i = 0; i < 3; i++) |
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col[i] -= chroma[i][d]*(INCWL - r) - chroma[i][d + 1]*r; |
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void |
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scolor2colr( /* assign RGBE from spectral color */ |
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COLR clr, |
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SCOLOR scol, /* uses average over bands */ |
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int ncs, |
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float wlpt[4] |
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) |
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{ |
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COLOR col; |
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col[RED] = (col[RED] + 0.5) / (256*INCWL); |
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col[GRN] = (col[GRN] + 0.5) / (256*INCWL); |
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col[BLU] = (col[BLU] + 0.5) / (256*INCWL); |
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scolor2color(col, scol, ncs, wlpt); |
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setcolr(clr, col[RED], col[GRN], col[BLU]); |
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} |
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cie_rgb(rgbcolor, ciecolor) /* convert CIE to RGB (NTSC) */ |
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register COLOR rgbcolor, ciecolor; |
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void |
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scolor2scolr( /* float spectrum to common exponent */ |
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SCOLR sclr, |
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SCOLOR scol, |
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int ncs |
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) |
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{ |
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static float cmat[3][3] = { |
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1.73, -.48, -.26, |
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-.81, 1.65, -.02, |
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.08, -.17, 1.28, |
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}; |
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register int i; |
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int i = ncs; |
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COLORV p = scol[--i]; |
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|
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for (i = 0; i < 3; i++) { |
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rgbcolor[i] = cmat[i][0]*ciecolor[0] + |
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cmat[i][1]*ciecolor[1] + |
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cmat[i][2]*ciecolor[2] ; |
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if (rgbcolor[i] < 0.0) |
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rgbcolor[i] = 0.0; |
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while (i) |
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if (scol[--i] > p) |
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p = scol[i]; |
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if (p <= 1e-32) { |
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memset(sclr, 0, ncs+1); |
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return; |
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} |
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p = frexp(p, &i) * 256.0 / p; |
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sclr[ncs] = i + COLXS; |
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for (i = ncs; i--; ) |
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sclr[i] = (scol[i] > 0) * (int)(scol[i]*p); |
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} |
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#endif |
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fputresolu(ord, xres, yres, fp) /* put x and y resolution */ |
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register int ord; |
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int xres, yres; |
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FILE *fp; |
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void |
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scolr2scolor( /* common exponent to float spectrum */ |
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SCOLOR scol, |
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SCOLR sclr, |
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int ncs |
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) |
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{ |
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if (ord&YMAJOR) |
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fprintf(fp, "%cY %d %cX %d\n", |
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ord&YDECR ? '-' : '+', yres, |
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ord&XDECR ? '-' : '+', xres); |
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else |
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fprintf(fp, "%cX %d %cY %d\n", |
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ord&XDECR ? '-' : '+', xres, |
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ord&YDECR ? '-' : '+', yres); |
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double f; |
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int i; |
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|
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> |
if (sclr[ncs] == 0) { |
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memset(scol, 0, sizeof(COLORV)*ncs); |
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return; |
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} |
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f = ldexp(1.0, (int)sclr[ncs]-(COLXS+8)); |
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|
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for (i = ncs; i--; ) |
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scol[i] = (sclr[i] + 0.5)*f; |
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} |
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|
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|
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fgetresolu(xrp, yrp, fp) /* get x and y resolution */ |
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int *xrp, *yrp; |
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FILE *fp; |
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double |
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scolor_mean( /* compute average for spectral color */ |
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> |
SCOLOR scol |
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) |
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{ |
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< |
char buf[64], *xndx, *yndx; |
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register char *cp; |
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register int ord; |
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> |
int i = NCSAMP; |
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> |
double sum = 0; |
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|
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< |
if (fgets(buf, sizeof(buf), fp) == NULL) |
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< |
return(-1); |
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< |
xndx = yndx = NULL; |
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< |
for (cp = buf+1; *cp; cp++) |
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if (*cp == 'X') |
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xndx = cp; |
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< |
else if (*cp == 'Y') |
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< |
yndx = cp; |
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< |
if (xndx == NULL || yndx == NULL) |
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< |
return(-1); |
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< |
ord = 0; |
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< |
if (xndx > yndx) ord |= YMAJOR; |
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< |
if (xndx[-1] == '-') ord |= XDECR; |
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< |
if (yndx[-1] == '-') ord |= YDECR; |
| 148 |
< |
if ((*xrp = atoi(xndx+1)) <= 0) |
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< |
return(-1); |
| 150 |
< |
if ((*yrp = atoi(yndx+1)) <= 0) |
| 151 |
< |
return(-1); |
| 152 |
< |
return(ord); |
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> |
while (i--) |
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> |
sum += scol[i]; |
| 204 |
> |
|
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> |
return sum/(double)NCSAMP; |
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} |
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|
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|
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fwritecolrs(scanline, len, fp) /* write out a colr scanline */ |
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< |
register COLR *scanline; |
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< |
int len; |
| 212 |
< |
register FILE *fp; |
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> |
double |
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> |
sintens( /* find maximum value from spectrum */ |
| 211 |
> |
SCOLOR scol |
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> |
) |
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{ |
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< |
COLR lastcolr; |
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< |
int rept; |
| 214 |
> |
int i = NCSAMP; |
| 215 |
> |
COLORV peak = scol[--i]; |
| 216 |
> |
|
| 217 |
> |
while (i) |
| 218 |
> |
if (scol[--i] > peak) |
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> |
peak = scol[i]; |
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> |
|
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> |
return peak; |
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> |
} |
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> |
|
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> |
|
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> |
void |
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> |
convertscolor( /* spectrum conversion, zero-fill ends */ |
| 227 |
> |
SCOLOR dst, /* destination spectrum */ |
| 228 |
> |
int dnc, /* destination # of spectral samples/intervals */ |
| 229 |
> |
double dwl0, /* starting destination wavelength (longer) */ |
| 230 |
> |
double dwl1, /* ending destination wavelength (shorter) */ |
| 231 |
> |
const COLORV src[], /* source spectrum array */ |
| 232 |
> |
int snc, |
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> |
double swl0, /* long/short wavelengths may be reversed */ |
| 234 |
> |
double swl1 |
| 235 |
> |
) |
| 236 |
> |
{ |
| 237 |
> |
const int sdir = 1 - 2*(swl0 < swl1); |
| 238 |
> |
const double sstp = (swl1 - swl0)/(double)snc; |
| 239 |
> |
const double dstp = (dwl1 - dwl0)/(double)dnc; |
| 240 |
> |
const double rdstp = 1./dstp; |
| 241 |
> |
int si, ssi, di; |
| 242 |
> |
double wl; |
| 243 |
> |
|
| 244 |
> |
if ((dnc < 3) | (dwl0 <= dwl1) | (dst == src)) |
| 245 |
> |
return; /* invalid destination */ |
| 246 |
> |
|
| 247 |
> |
if (dnc == snc && (dwl0-swl0)*(dwl0-swl0) + (dwl1-swl1)*(dwl1-swl1) <= .5) { |
| 248 |
> |
memcpy(dst, src, sizeof(COLORV)*dnc); |
| 249 |
> |
return; /* same spectral sampling */ |
| 250 |
> |
} |
| 251 |
> |
memset(dst, 0, sizeof(COLORV)*dnc); |
| 252 |
> |
/* set starting positions */ |
| 253 |
> |
if ((sdir>0 ? swl0 : swl1) <= dwl0) { |
| 254 |
> |
if (sdir > 0) { |
| 255 |
> |
wl = swl0; |
| 256 |
> |
ssi = 0; |
| 257 |
> |
} else { |
| 258 |
> |
wl = swl1; |
| 259 |
> |
ssi = snc-1; |
| 260 |
> |
} |
| 261 |
> |
si = 0; |
| 262 |
> |
di = (wl - dwl0)*rdstp; |
| 263 |
> |
} else { |
| 264 |
> |
wl = dwl0; |
| 265 |
> |
si = (wl - (sdir>0 ? swl0 : swl1))/sstp; |
| 266 |
> |
ssi = sdir > 0 ? si : snc-1 - si; |
| 267 |
> |
di = 0; |
| 268 |
> |
} |
| 269 |
> |
swl0 += (sdir < 0)*sstp; |
| 270 |
> |
/* step through intervals */ |
| 271 |
> |
while ((si < snc) & (di < dnc)) { |
| 272 |
> |
double intvl; |
| 273 |
> |
if (swl0 + (ssi+sdir)*sstp < dwl0 + (di+1)*dstp) { |
| 274 |
> |
intvl = dwl0 + (di+1)*dstp - wl; |
| 275 |
> |
dst[di++] += src[ssi]*intvl*rdstp; |
| 276 |
> |
} else { |
| 277 |
> |
intvl = swl0 + (ssi+sdir)*sstp - wl; |
| 278 |
> |
dst[di] += src[ssi]*intvl*rdstp; |
| 279 |
> |
ssi += sdir; |
| 280 |
> |
si++; |
| 281 |
> |
} |
| 282 |
> |
wl += intvl; |
| 283 |
> |
} |
| 284 |
> |
} |
| 285 |
> |
|
| 286 |
> |
|
| 287 |
> |
void * |
| 288 |
> |
tempbuffer( /* get a temporary buffer */ |
| 289 |
> |
size_t len |
| 290 |
> |
) |
| 291 |
> |
{ |
| 292 |
> |
static void *tempbuf = NULL; |
| 293 |
> |
static size_t tempbuflen = 0; |
| 294 |
> |
|
| 295 |
> |
if (!len) { /* call to free */ |
| 296 |
> |
if (tempbuflen) { |
| 297 |
> |
free(tempbuf); |
| 298 |
> |
tempbuf = NULL; |
| 299 |
> |
tempbuflen = 0; |
| 300 |
> |
} |
| 301 |
> |
return(NULL); |
| 302 |
> |
} |
| 303 |
> |
if (len <= tempbuflen) /* big enough already? */ |
| 304 |
> |
return(tempbuf); |
| 305 |
> |
/* else free & reallocate */ |
| 306 |
> |
if (tempbuflen) |
| 307 |
> |
free(tempbuf); |
| 308 |
> |
tempbuf = malloc(len); |
| 309 |
> |
tempbuflen = len*(tempbuf != NULL); |
| 310 |
> |
return(tempbuf); |
| 311 |
> |
} |
| 312 |
> |
|
| 313 |
> |
|
| 314 |
> |
int |
| 315 |
> |
fwritecolrs( /* write out a colr scanline */ |
| 316 |
> |
COLR *scanline, |
| 317 |
> |
int len, |
| 318 |
> |
FILE *fp |
| 319 |
> |
) |
| 320 |
> |
{ |
| 321 |
> |
int i, j, beg, cnt = 1; |
| 322 |
> |
int c2; |
| 323 |
|
|
| 324 |
< |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
| 325 |
< |
lastcolr[EXP] = 0; |
| 326 |
< |
rept = 0; |
| 327 |
< |
|
| 328 |
< |
while (len > 0) { |
| 329 |
< |
if (scanline[0][EXP] == lastcolr[EXP] && |
| 330 |
< |
scanline[0][RED] == lastcolr[RED] && |
| 331 |
< |
scanline[0][GRN] == lastcolr[GRN] && |
| 332 |
< |
scanline[0][BLU] == lastcolr[BLU]) |
| 333 |
< |
rept++; |
| 334 |
< |
else { |
| 335 |
< |
while (rept) { /* write out count */ |
| 336 |
< |
putc(1, fp); |
| 337 |
< |
putc(1, fp); |
| 338 |
< |
putc(1, fp); |
| 339 |
< |
putc(rept & 255, fp); |
| 340 |
< |
rept >>= 8; |
| 324 |
> |
if ((len < MINELEN) | (len > MAXELEN)) /* OOBs, write out flat */ |
| 325 |
> |
return(fwrite((char *)scanline,sizeof(COLR),len,fp) - len); |
| 326 |
> |
/* put magic header */ |
| 327 |
> |
putc(2, fp); |
| 328 |
> |
putc(2, fp); |
| 329 |
> |
putc(len>>8, fp); |
| 330 |
> |
putc(len&0xff, fp); |
| 331 |
> |
/* put components seperately */ |
| 332 |
> |
for (i = 0; i < 4; i++) { |
| 333 |
> |
for (j = 0; j < len; j += cnt) { /* find next run */ |
| 334 |
> |
for (beg = j; beg < len; beg += cnt) { |
| 335 |
> |
for (cnt = 1; (cnt < 127) & (beg+cnt < len) && |
| 336 |
> |
scanline[beg+cnt][i] == scanline[beg][i]; cnt++) |
| 337 |
> |
; |
| 338 |
> |
if (cnt >= MINRUN) |
| 339 |
> |
break; /* long enough */ |
| 340 |
> |
} |
| 341 |
> |
if ((beg-j > 1) & (beg-j < MINRUN)) { |
| 342 |
> |
c2 = j+1; |
| 343 |
> |
while (scanline[c2++][i] == scanline[j][i]) |
| 344 |
> |
if (c2 == beg) { /* short run */ |
| 345 |
> |
putc(128+beg-j, fp); |
| 346 |
> |
putc(scanline[j][i], fp); |
| 347 |
> |
j = beg; |
| 348 |
> |
break; |
| 349 |
|
} |
| 182 |
– |
putc(scanline[0][RED], fp); /* new color */ |
| 183 |
– |
putc(scanline[0][GRN], fp); |
| 184 |
– |
putc(scanline[0][BLU], fp); |
| 185 |
– |
putc(scanline[0][EXP], fp); |
| 186 |
– |
copycolr(lastcolr, scanline[0]); |
| 187 |
– |
rept = 0; |
| 350 |
|
} |
| 351 |
< |
scanline++; |
| 352 |
< |
len--; |
| 351 |
> |
while (j < beg) { /* write out non-run */ |
| 352 |
> |
if ((c2 = beg-j) > 128) c2 = 128; |
| 353 |
> |
putc(c2, fp); |
| 354 |
> |
while (c2--) |
| 355 |
> |
putc(scanline[j++][i], fp); |
| 356 |
> |
} |
| 357 |
> |
if (cnt >= MINRUN) { /* write out run */ |
| 358 |
> |
putc(128+cnt, fp); |
| 359 |
> |
putc(scanline[beg][i], fp); |
| 360 |
> |
} else |
| 361 |
> |
cnt = 0; |
| 362 |
> |
} |
| 363 |
|
} |
| 192 |
– |
while (rept) { /* write out count */ |
| 193 |
– |
putc(1, fp); |
| 194 |
– |
putc(1, fp); |
| 195 |
– |
putc(1, fp); |
| 196 |
– |
putc(rept & 255, fp); |
| 197 |
– |
rept >>= 8; |
| 198 |
– |
} |
| 364 |
|
return(ferror(fp) ? -1 : 0); |
| 365 |
|
} |
| 366 |
|
|
| 367 |
< |
|
| 368 |
< |
freadcolrs(scanline, len, fp) /* read in a colr scanline */ |
| 369 |
< |
register COLR *scanline; |
| 370 |
< |
int len; |
| 371 |
< |
register FILE *fp; |
| 367 |
> |
/* |
| 368 |
> |
* An old-format scanline is either a stream of valid RGBE or XYZE real |
| 369 |
> |
* pixels or at least one real pixel followed by some number of |
| 370 |
> |
* invalid real pixels of the form (1,1,1,n), where n is a count. |
| 371 |
> |
* These can themselves be repeated to create a multibyte repeat |
| 372 |
> |
* count, with the least significant byte first (little-endian order.) |
| 373 |
> |
* Repeat counts are limited by the size of an int; if a repetition |
| 374 |
> |
* leads to an overrun, the rest of the the repetition will be |
| 375 |
> |
* silently ignored. |
| 376 |
> |
*/ |
| 377 |
> |
static int |
| 378 |
> |
oldreadcolrs( /* read in an old-style colr scanline */ |
| 379 |
> |
COLR *scanline, |
| 380 |
> |
int len, |
| 381 |
> |
FILE *fp |
| 382 |
> |
) |
| 383 |
|
{ |
| 384 |
< |
int rshift; |
| 385 |
< |
register int i; |
| 384 |
> |
int rshift = 0; |
| 385 |
> |
int i; |
| 386 |
|
|
| 211 |
– |
rshift = 0; |
| 212 |
– |
|
| 387 |
|
while (len > 0) { |
| 388 |
|
scanline[0][RED] = getc(fp); |
| 389 |
|
scanline[0][GRN] = getc(fp); |
| 390 |
|
scanline[0][BLU] = getc(fp); |
| 391 |
< |
scanline[0][EXP] = getc(fp); |
| 392 |
< |
if (feof(fp) || ferror(fp)) |
| 391 |
> |
scanline[0][EXP] = i = getc(fp); |
| 392 |
> |
if (i == EOF) |
| 393 |
|
return(-1); |
| 394 |
< |
if (scanline[0][RED] == 1 && |
| 395 |
< |
scanline[0][GRN] == 1 && |
| 396 |
< |
scanline[0][BLU] == 1) { |
| 397 |
< |
for (i = scanline[0][EXP] << rshift; i > 0; i--) { |
| 394 |
> |
if (scanline[0][GRN] == 1 && |
| 395 |
> |
(scanline[0][RED] == 1) & |
| 396 |
> |
(scanline[0][BLU] == 1)) { |
| 397 |
> |
i = scanline[0][EXP] << rshift; |
| 398 |
> |
while (i--) { |
| 399 |
|
copycolr(scanline[0], scanline[-1]); |
| 400 |
+ |
if (--len <= 0) |
| 401 |
+ |
return(0); |
| 402 |
|
scanline++; |
| 226 |
– |
len--; |
| 403 |
|
} |
| 404 |
|
rshift += 8; |
| 405 |
|
} else { |
| 411 |
|
return(0); |
| 412 |
|
} |
| 413 |
|
|
| 414 |
+ |
/* |
| 415 |
+ |
* There are two scanline formats: old and new. The old format |
| 416 |
+ |
* compresses runs of RGBE or XYZE four-byte real pixels; the new |
| 417 |
+ |
* format breaks the pixels into R, G, B, and E lines (or XYZE lines) |
| 418 |
+ |
* which are individually run-length encoded. |
| 419 |
+ |
* |
| 420 |
+ |
* An old-format scanline always begins with a valid real pixel; at |
| 421 |
+ |
* least one of the RGB (or XYZ) values will have its high-order bit |
| 422 |
+ |
* set. A new-format scanline begins with four bytes which are not a |
| 423 |
+ |
* valid real pixel: (2, 2, lenhigh, lenlow) where lenhigh is always |
| 424 |
+ |
* less than 128 and hence never has a high-order bit set. |
| 425 |
+ |
* |
| 426 |
+ |
* A new-format scanline is broken into its RGBE or XYZE components. |
| 427 |
+ |
* Each is output and run-length encoded separately so that a scanline |
| 428 |
+ |
* is broken into four records. In turn, each record is organized |
| 429 |
+ |
* into chunks of up to 128 characters, which begin with a count byte. |
| 430 |
+ |
* If the count byte is greater than 128, the following data byte is |
| 431 |
+ |
* repeated (count-128) times. If not, the count byte is followed by |
| 432 |
+ |
* that many data bytes. |
| 433 |
+ |
*/ |
| 434 |
+ |
int |
| 435 |
+ |
freadcolrs( /* read in an encoded colr scanline */ |
| 436 |
+ |
COLR *scanline, |
| 437 |
+ |
int len, |
| 438 |
+ |
FILE *fp |
| 439 |
+ |
) |
| 440 |
+ |
{ |
| 441 |
+ |
int i, j; |
| 442 |
+ |
int code, val; |
| 443 |
+ |
/* determine scanline type */ |
| 444 |
+ |
if (len <= 0) |
| 445 |
+ |
return(0); |
| 446 |
+ |
if ((i = getc(fp)) == EOF) |
| 447 |
+ |
return(-1); |
| 448 |
+ |
scanline[0][RED] = i; |
| 449 |
+ |
scanline[0][GRN] = getc(fp); |
| 450 |
+ |
scanline[0][BLU] = getc(fp); |
| 451 |
+ |
if ((i = getc(fp)) == EOF) |
| 452 |
+ |
return(-1); |
| 453 |
+ |
if ((scanline[0][RED] != 2) | (scanline[0][GRN] != 2) | |
| 454 |
+ |
(scanline[0][BLU] & 0x80)) { |
| 455 |
+ |
scanline[0][EXP] = i; |
| 456 |
+ |
return(oldreadcolrs(scanline+1, len-1, fp)); |
| 457 |
+ |
} |
| 458 |
+ |
if ((scanline[0][BLU]<<8 | i) != len) |
| 459 |
+ |
return(-1); /* length mismatch! */ |
| 460 |
+ |
/* read each component */ |
| 461 |
+ |
for (i = 0; i < 4; i++) |
| 462 |
+ |
for (j = 0; j < len; ) { |
| 463 |
+ |
if ((code = getc(fp)) == EOF) |
| 464 |
+ |
return(-1); |
| 465 |
+ |
if (code > 128) { /* run */ |
| 466 |
+ |
code &= 127; |
| 467 |
+ |
if ((val = getc(fp)) == EOF) |
| 468 |
+ |
return -1; |
| 469 |
+ |
if (j + code > len) |
| 470 |
+ |
return -1; /* overrun */ |
| 471 |
+ |
while (code--) |
| 472 |
+ |
scanline[j++][i] = val; |
| 473 |
+ |
} else { /* non-run */ |
| 474 |
+ |
if (j + code > len) |
| 475 |
+ |
return -1; /* overrun */ |
| 476 |
+ |
while (code--) { |
| 477 |
+ |
if ((val = getc(fp)) == EOF) |
| 478 |
+ |
return -1; |
| 479 |
+ |
scanline[j++][i] = val; |
| 480 |
+ |
} |
| 481 |
+ |
} |
| 482 |
+ |
} |
| 483 |
+ |
return(0); |
| 484 |
+ |
} |
| 485 |
|
|
| 486 |
< |
fwritescan(scanline, len, fp) /* write out a scanline */ |
| 487 |
< |
register COLOR *scanline; |
| 488 |
< |
int len; |
| 489 |
< |
register FILE *fp; |
| 486 |
> |
|
| 487 |
> |
int |
| 488 |
> |
fwritescan( /* write out a scanline */ |
| 489 |
> |
COLOR *scanline, |
| 490 |
> |
int len, |
| 491 |
> |
FILE *fp |
| 492 |
> |
) |
| 493 |
|
{ |
| 494 |
< |
COLR lastcolr, thiscolr; |
| 495 |
< |
int rept; |
| 496 |
< |
|
| 497 |
< |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
| 498 |
< |
lastcolr[EXP] = 0; |
| 499 |
< |
rept = 0; |
| 500 |
< |
|
| 501 |
< |
while (len > 0) { |
| 502 |
< |
setcolr(thiscolr, scanline[0][RED], |
| 494 |
> |
COLR *clrscan; |
| 495 |
> |
int n; |
| 496 |
> |
COLR *sp; |
| 497 |
> |
/* get scanline buffer */ |
| 498 |
> |
if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
| 499 |
> |
return(-1); |
| 500 |
> |
clrscan = sp; |
| 501 |
> |
/* convert scanline */ |
| 502 |
> |
n = len; |
| 503 |
> |
while (n-- > 0) { |
| 504 |
> |
setcolr(sp[0], scanline[0][RED], |
| 505 |
|
scanline[0][GRN], |
| 506 |
|
scanline[0][BLU]); |
| 255 |
– |
if (thiscolr[EXP] == lastcolr[EXP] && |
| 256 |
– |
thiscolr[RED] == lastcolr[RED] && |
| 257 |
– |
thiscolr[GRN] == lastcolr[GRN] && |
| 258 |
– |
thiscolr[BLU] == lastcolr[BLU]) |
| 259 |
– |
rept++; |
| 260 |
– |
else { |
| 261 |
– |
while (rept) { /* write out count */ |
| 262 |
– |
putc(1, fp); |
| 263 |
– |
putc(1, fp); |
| 264 |
– |
putc(1, fp); |
| 265 |
– |
putc(rept & 255, fp); |
| 266 |
– |
rept >>= 8; |
| 267 |
– |
} |
| 268 |
– |
putc(thiscolr[RED], fp); /* new color */ |
| 269 |
– |
putc(thiscolr[GRN], fp); |
| 270 |
– |
putc(thiscolr[BLU], fp); |
| 271 |
– |
putc(thiscolr[EXP], fp); |
| 272 |
– |
copycolr(lastcolr, thiscolr); |
| 273 |
– |
rept = 0; |
| 274 |
– |
} |
| 507 |
|
scanline++; |
| 508 |
< |
len--; |
| 508 |
> |
sp++; |
| 509 |
|
} |
| 510 |
< |
while (rept) { /* write out count */ |
| 279 |
< |
putc(1, fp); |
| 280 |
< |
putc(1, fp); |
| 281 |
< |
putc(1, fp); |
| 282 |
< |
putc(rept & 255, fp); |
| 283 |
< |
rept >>= 8; |
| 284 |
< |
} |
| 285 |
< |
return(ferror(fp) ? -1 : 0); |
| 510 |
> |
return(fwritecolrs(clrscan, len, fp)); |
| 511 |
|
} |
| 512 |
|
|
| 513 |
|
|
| 514 |
< |
freadscan(scanline, len, fp) /* read in a scanline */ |
| 515 |
< |
register COLOR *scanline; |
| 516 |
< |
int len; |
| 517 |
< |
register FILE *fp; |
| 514 |
> |
int |
| 515 |
> |
freadscan( /* read in a scanline */ |
| 516 |
> |
COLOR *scanline, |
| 517 |
> |
int len, |
| 518 |
> |
FILE *fp |
| 519 |
> |
) |
| 520 |
|
{ |
| 521 |
< |
COLR thiscolr; |
| 522 |
< |
int rshift; |
| 523 |
< |
register int i; |
| 524 |
< |
|
| 525 |
< |
rshift = 0; |
| 526 |
< |
|
| 527 |
< |
while (len > 0) { |
| 528 |
< |
thiscolr[RED] = getc(fp); |
| 529 |
< |
thiscolr[GRN] = getc(fp); |
| 530 |
< |
thiscolr[BLU] = getc(fp); |
| 531 |
< |
thiscolr[EXP] = getc(fp); |
| 532 |
< |
if (feof(fp) || ferror(fp)) |
| 533 |
< |
return(-1); |
| 534 |
< |
if (thiscolr[RED] == 1 && |
| 535 |
< |
thiscolr[GRN] == 1 && |
| 536 |
< |
thiscolr[BLU] == 1) { |
| 537 |
< |
for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
| 311 |
< |
copycolor(scanline[0], scanline[-1]); |
| 312 |
< |
scanline++; |
| 313 |
< |
len--; |
| 314 |
< |
} |
| 315 |
< |
rshift += 8; |
| 316 |
< |
} else { |
| 317 |
< |
colr_color(scanline[0], thiscolr); |
| 318 |
< |
scanline++; |
| 319 |
< |
len--; |
| 320 |
< |
rshift = 0; |
| 321 |
< |
} |
| 521 |
> |
COLR *clrscan; |
| 522 |
> |
|
| 523 |
> |
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
| 524 |
> |
return(-1); |
| 525 |
> |
if (freadcolrs(clrscan, len, fp) < 0) |
| 526 |
> |
return(-1); |
| 527 |
> |
/* convert scanline */ |
| 528 |
> |
colr_color(scanline[0], clrscan[0]); |
| 529 |
> |
while (--len > 0) { |
| 530 |
> |
scanline++; clrscan++; |
| 531 |
> |
if (clrscan[0][GRN] == clrscan[-1][GRN] && |
| 532 |
> |
(clrscan[0][RED] == clrscan[-1][RED]) & |
| 533 |
> |
(clrscan[0][BLU] == clrscan[-1][BLU]) & |
| 534 |
> |
(clrscan[0][EXP] == clrscan[-1][EXP])) |
| 535 |
> |
copycolor(scanline[0], scanline[-1]); |
| 536 |
> |
else |
| 537 |
> |
colr_color(scanline[0], clrscan[0]); |
| 538 |
|
} |
| 539 |
|
return(0); |
| 540 |
|
} |
| 541 |
|
|
| 542 |
|
|
| 543 |
< |
setcolr(clr, r, g, b) /* assign a short color value */ |
| 544 |
< |
register COLR clr; |
| 545 |
< |
double r, g, b; |
| 543 |
> |
void |
| 544 |
> |
setcolr( /* assign a short color value */ |
| 545 |
> |
COLR clr, |
| 546 |
> |
double r, |
| 547 |
> |
double g, |
| 548 |
> |
double b |
| 549 |
> |
) |
| 550 |
|
{ |
| 331 |
– |
double frexp(); |
| 551 |
|
double d; |
| 552 |
|
int e; |
| 553 |
|
|
| 562 |
|
|
| 563 |
|
d = frexp(d, &e) * 256.0 / d; |
| 564 |
|
|
| 565 |
< |
clr[RED] = r * d; |
| 566 |
< |
clr[GRN] = g * d; |
| 567 |
< |
clr[BLU] = b * d; |
| 565 |
> |
clr[RED] = (r > 0) * (int)(r*d); |
| 566 |
> |
clr[GRN] = (g > 0) * (int)(g*d); |
| 567 |
> |
clr[BLU] = (b > 0) * (int)(b*d); |
| 568 |
|
clr[EXP] = e + COLXS; |
| 569 |
|
} |
| 570 |
|
|
| 571 |
|
|
| 572 |
< |
colr_color(col, clr) /* convert short to float color */ |
| 573 |
< |
register COLOR col; |
| 574 |
< |
register COLR clr; |
| 572 |
> |
void |
| 573 |
> |
colr_color( /* convert short to float color */ |
| 574 |
> |
COLOR col, |
| 575 |
> |
COLR clr |
| 576 |
> |
) |
| 577 |
|
{ |
| 578 |
|
double f; |
| 579 |
|
|
| 580 |
< |
if (clr[EXP] == 0) |
| 580 |
> |
if (clr[EXP] == 0) { |
| 581 |
|
col[RED] = col[GRN] = col[BLU] = 0.0; |
| 582 |
< |
else { |
| 362 |
< |
f = ldexp(1.0, (int)clr[EXP]-(COLXS+8)); |
| 363 |
< |
col[RED] = (clr[RED] + 0.5)*f; |
| 364 |
< |
col[GRN] = (clr[GRN] + 0.5)*f; |
| 365 |
< |
col[BLU] = (clr[BLU] + 0.5)*f; |
| 582 |
> |
return; |
| 583 |
|
} |
| 584 |
+ |
f = ldexp(1.0, (int)clr[EXP]-(COLXS+8)); |
| 585 |
+ |
col[RED] = (clr[RED] + 0.5)*f; |
| 586 |
+ |
col[GRN] = (clr[GRN] + 0.5)*f; |
| 587 |
+ |
col[BLU] = (clr[BLU] + 0.5)*f; |
| 588 |
|
} |
| 589 |
|
|
| 590 |
|
|
| 591 |
< |
normcolrs(scan, len, adjust) /* normalize a scanline of colrs */ |
| 592 |
< |
register COLR *scan; |
| 593 |
< |
int len; |
| 594 |
< |
int adjust; |
| 591 |
> |
int |
| 592 |
> |
bigdiff( /* c1 delta c2 > md? */ |
| 593 |
> |
COLOR c1, |
| 594 |
> |
COLOR c2, |
| 595 |
> |
double md |
| 596 |
> |
) |
| 597 |
|
{ |
| 598 |
< |
register int c; |
| 376 |
< |
register int shift; |
| 598 |
> |
int i; |
| 599 |
|
|
| 600 |
< |
while (len-- > 0) { |
| 601 |
< |
shift = scan[0][EXP] + adjust - COLXS; |
| 602 |
< |
if (shift > 0) { |
| 603 |
< |
if (shift > 8) { |
| 604 |
< |
scan[0][RED] = |
| 383 |
< |
scan[0][GRN] = |
| 384 |
< |
scan[0][BLU] = 255; |
| 385 |
< |
} else { |
| 386 |
< |
shift--; |
| 387 |
< |
c = (scan[0][RED]<<1 | 1) << shift; |
| 388 |
< |
scan[0][RED] = c > 255 ? 255 : c; |
| 389 |
< |
c = (scan[0][GRN]<<1 | 1) << shift; |
| 390 |
< |
scan[0][GRN] = c > 255 ? 255 : c; |
| 391 |
< |
c = (scan[0][BLU]<<1 | 1) << shift; |
| 392 |
< |
scan[0][BLU] = c > 255 ? 255 : c; |
| 393 |
< |
} |
| 394 |
< |
} else if (shift < 0) { |
| 395 |
< |
if (shift < -8) { |
| 396 |
< |
scan[0][RED] = |
| 397 |
< |
scan[0][GRN] = |
| 398 |
< |
scan[0][BLU] = 0; |
| 399 |
< |
} else { |
| 400 |
< |
shift = -1-shift; |
| 401 |
< |
scan[0][RED] = ((scan[0][RED]>>shift)+1)>>1; |
| 402 |
< |
scan[0][GRN] = ((scan[0][GRN]>>shift)+1)>>1; |
| 403 |
< |
scan[0][BLU] = ((scan[0][BLU]>>shift)+1)>>1; |
| 404 |
< |
} |
| 405 |
< |
} |
| 406 |
< |
scan[0][EXP] = COLXS - adjust; |
| 407 |
< |
scan++; |
| 408 |
< |
} |
| 600 |
> |
for (i = 0; i < 3; i++) |
| 601 |
> |
if ((colval(c1,i)-colval(c2,i) > md*colval(c2,i)) | |
| 602 |
> |
(colval(c2,i)-colval(c1,i) > md*colval(c1,i))) |
| 603 |
> |
return(1); |
| 604 |
> |
return(0); |
| 605 |
|
} |
| 606 |
|
|
| 607 |
|
|
| 608 |
< |
bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
| 609 |
< |
register COLOR c1, c2; |
| 610 |
< |
double md; |
| 608 |
> |
int |
| 609 |
> |
sbigsdiff( /* sc1 delta sc2 > md? */ |
| 610 |
> |
SCOLOR c1, |
| 611 |
> |
SCOLOR c2, |
| 612 |
> |
double md |
| 613 |
> |
) |
| 614 |
|
{ |
| 615 |
< |
register int i; |
| 615 |
> |
int i = NCSAMP; |
| 616 |
|
|
| 617 |
< |
for (i = 0; i < 3; i++) |
| 618 |
< |
if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) || |
| 420 |
< |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
| 617 |
> |
while (i--) |
| 618 |
> |
if ((c1[i]-c2[i] > md*c2[i]) | (c2[i]-c1[i] > md*c1[i])) |
| 619 |
|
return(1); |
| 620 |
|
return(0); |
| 621 |
|
} |
