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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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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 "copyright.h" |
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|
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#include <stdio.h> |
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|
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#include "color.h" |
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#include <stdlib.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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#include <math.h> |
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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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#include "color.h" |
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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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}; |
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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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|
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spec_rgb(col, s, e) /* comput RGB color from spectral range */ |
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COLOR col; |
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int s, e; |
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char * |
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tempbuffer(len) /* get a temporary buffer */ |
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unsigned int len; |
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{ |
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COLOR ciecolor; |
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static char *tempbuf = NULL; |
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static unsigned tempbuflen = 0; |
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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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} |
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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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{ |
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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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|
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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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|
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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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|
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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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|
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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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} |
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|
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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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{ |
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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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|
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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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if (len > tempbuflen) { |
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if (tempbuflen > 0) |
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tempbuf = (char *)realloc(tempbuf, len); |
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else |
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tempbuf = (char *)malloc(len); |
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tempbuflen = tempbuf==NULL ? 0 : len; |
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} |
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return(tempbuf); |
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} |
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#endif |
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|
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|
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int |
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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; |
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register FILE *fp; |
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{ |
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COLR lastcolr; |
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int rept; |
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register int i, j, beg, cnt = 1; |
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int c2; |
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|
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lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
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lastcolr[EXP] = 0; |
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rept = 0; |
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|
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while (len > 0) { |
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if (scanline[0][EXP] == lastcolr[EXP] && |
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scanline[0][RED] == lastcolr[RED] && |
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scanline[0][GRN] == lastcolr[GRN] && |
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scanline[0][BLU] == lastcolr[BLU]) |
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rept++; |
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else { |
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while (rept) { /* write out count */ |
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putc(1, fp); |
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putc(1, fp); |
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putc(1, fp); |
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putc(rept & 255, fp); |
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rept >>= 8; |
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if (len < MINELEN | len > MAXELEN) /* OOBs, write out flat */ |
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return(fwrite((char *)scanline,sizeof(COLR),len,fp) - len); |
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/* put magic header */ |
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putc(2, fp); |
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putc(2, fp); |
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putc(len>>8, fp); |
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putc(len&255, fp); |
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/* put components seperately */ |
60 |
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for (i = 0; i < 4; i++) { |
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for (j = 0; j < len; j += cnt) { /* find next run */ |
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> |
for (beg = j; beg < len; beg += cnt) { |
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for (cnt = 1; cnt < 127 && beg+cnt < len && |
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scanline[beg+cnt][i] == scanline[beg][i]; cnt++) |
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; |
66 |
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if (cnt >= MINRUN) |
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break; /* long enough */ |
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} |
69 |
> |
if (beg-j > 1 && beg-j < MINRUN) { |
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c2 = j+1; |
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> |
while (scanline[c2++][i] == scanline[j][i]) |
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if (c2 == beg) { /* short run */ |
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putc(128+beg-j, fp); |
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putc(scanline[j][i], fp); |
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j = beg; |
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break; |
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} |
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putc(scanline[0][RED], fp); /* new color */ |
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putc(scanline[0][GRN], fp); |
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putc(scanline[0][BLU], fp); |
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putc(scanline[0][EXP], fp); |
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copycolr(lastcolr, scanline[0]); |
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rept = 0; |
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} |
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scanline++; |
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len--; |
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while (j < beg) { /* write out non-run */ |
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if ((c2 = beg-j) > 128) c2 = 128; |
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putc(c2, fp); |
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while (c2--) |
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putc(scanline[j++][i], fp); |
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} |
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if (cnt >= MINRUN) { /* write out run */ |
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putc(128+cnt, fp); |
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putc(scanline[beg][i], fp); |
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} else |
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cnt = 0; |
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} |
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} |
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while (rept) { /* write out count */ |
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putc(1, fp); |
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putc(1, fp); |
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putc(1, fp); |
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putc(rept & 255, fp); |
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rept >>= 8; |
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} |
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return(ferror(fp) ? -1 : 0); |
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} |
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|
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|
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freadcolrs(scanline, len, fp) /* read in a colr scanline */ |
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static int |
97 |
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oldreadcolrs(scanline, len, fp) /* read in an old colr scanline */ |
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register COLR *scanline; |
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int len; |
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register FILE *fp; |
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} |
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|
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|
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int |
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freadcolrs(scanline, len, fp) /* read in an encoded colr scanline */ |
135 |
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register COLR *scanline; |
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int len; |
137 |
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register FILE *fp; |
138 |
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{ |
139 |
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register int i, j; |
140 |
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int code, val; |
141 |
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/* determine scanline type */ |
142 |
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if (len < MINELEN | len > MAXELEN) |
143 |
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return(oldreadcolrs(scanline, len, fp)); |
144 |
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if ((i = getc(fp)) == EOF) |
145 |
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return(-1); |
146 |
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if (i != 2) { |
147 |
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ungetc(i, fp); |
148 |
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return(oldreadcolrs(scanline, len, fp)); |
149 |
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} |
150 |
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scanline[0][GRN] = getc(fp); |
151 |
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scanline[0][BLU] = getc(fp); |
152 |
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if ((i = getc(fp)) == EOF) |
153 |
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return(-1); |
154 |
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if (scanline[0][GRN] != 2 || scanline[0][BLU] & 128) { |
155 |
+ |
scanline[0][RED] = 2; |
156 |
+ |
scanline[0][EXP] = i; |
157 |
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return(oldreadcolrs(scanline+1, len-1, fp)); |
158 |
+ |
} |
159 |
+ |
if ((scanline[0][BLU]<<8 | i) != len) |
160 |
+ |
return(-1); /* length mismatch! */ |
161 |
+ |
/* read each component */ |
162 |
+ |
for (i = 0; i < 4; i++) |
163 |
+ |
for (j = 0; j < len; ) { |
164 |
+ |
if ((code = getc(fp)) == EOF) |
165 |
+ |
return(-1); |
166 |
+ |
if (code > 128) { /* run */ |
167 |
+ |
code &= 127; |
168 |
+ |
if ((val = getc(fp)) == EOF) |
169 |
+ |
return -1; |
170 |
+ |
while (code--) |
171 |
+ |
scanline[j++][i] = val; |
172 |
+ |
} else /* non-run */ |
173 |
+ |
while (code--) { |
174 |
+ |
if ((val = getc(fp)) == EOF) |
175 |
+ |
return -1; |
176 |
+ |
scanline[j++][i] = val; |
177 |
+ |
} |
178 |
+ |
} |
179 |
+ |
return(0); |
180 |
+ |
} |
181 |
+ |
|
182 |
+ |
|
183 |
+ |
int |
184 |
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fwritescan(scanline, len, fp) /* write out a scanline */ |
185 |
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register COLOR *scanline; |
186 |
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int len; |
187 |
< |
register FILE *fp; |
187 |
> |
FILE *fp; |
188 |
|
{ |
189 |
< |
COLR lastcolr, thiscolr; |
190 |
< |
int rept; |
191 |
< |
|
192 |
< |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
193 |
< |
lastcolr[EXP] = 0; |
194 |
< |
rept = 0; |
195 |
< |
|
196 |
< |
while (len > 0) { |
197 |
< |
setcolr(thiscolr, scanline[0][RED], |
189 |
> |
COLR *clrscan; |
190 |
> |
int n; |
191 |
> |
register COLR *sp; |
192 |
> |
/* get scanline buffer */ |
193 |
> |
if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
194 |
> |
return(-1); |
195 |
> |
clrscan = sp; |
196 |
> |
/* convert scanline */ |
197 |
> |
n = len; |
198 |
> |
while (n-- > 0) { |
199 |
> |
setcolr(sp[0], scanline[0][RED], |
200 |
|
scanline[0][GRN], |
201 |
|
scanline[0][BLU]); |
209 |
– |
if (thiscolr[EXP] == lastcolr[EXP] && |
210 |
– |
thiscolr[RED] == lastcolr[RED] && |
211 |
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thiscolr[GRN] == lastcolr[GRN] && |
212 |
– |
thiscolr[BLU] == lastcolr[BLU]) |
213 |
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rept++; |
214 |
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else { |
215 |
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while (rept) { /* write out count */ |
216 |
– |
putc(1, fp); |
217 |
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putc(1, fp); |
218 |
– |
putc(1, fp); |
219 |
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putc(rept & 255, fp); |
220 |
– |
rept >>= 8; |
221 |
– |
} |
222 |
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putc(thiscolr[RED], fp); /* new color */ |
223 |
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putc(thiscolr[GRN], fp); |
224 |
– |
putc(thiscolr[BLU], fp); |
225 |
– |
putc(thiscolr[EXP], fp); |
226 |
– |
copycolr(lastcolr, thiscolr); |
227 |
– |
rept = 0; |
228 |
– |
} |
202 |
|
scanline++; |
203 |
< |
len--; |
203 |
> |
sp++; |
204 |
|
} |
205 |
< |
while (rept) { /* write out count */ |
233 |
< |
putc(1, fp); |
234 |
< |
putc(1, fp); |
235 |
< |
putc(1, fp); |
236 |
< |
putc(rept & 255, fp); |
237 |
< |
rept >>= 8; |
238 |
< |
} |
239 |
< |
return(ferror(fp) ? -1 : 0); |
205 |
> |
return(fwritecolrs(clrscan, len, fp)); |
206 |
|
} |
207 |
|
|
208 |
|
|
209 |
+ |
int |
210 |
|
freadscan(scanline, len, fp) /* read in a scanline */ |
211 |
|
register COLOR *scanline; |
212 |
|
int len; |
213 |
< |
register FILE *fp; |
213 |
> |
FILE *fp; |
214 |
|
{ |
215 |
< |
COLR thiscolr; |
216 |
< |
int rshift; |
217 |
< |
register int i; |
218 |
< |
|
219 |
< |
rshift = 0; |
220 |
< |
|
221 |
< |
while (len > 0) { |
222 |
< |
thiscolr[RED] = getc(fp); |
223 |
< |
thiscolr[GRN] = getc(fp); |
224 |
< |
thiscolr[BLU] = getc(fp); |
225 |
< |
thiscolr[EXP] = getc(fp); |
226 |
< |
if (feof(fp) || ferror(fp)) |
227 |
< |
return(-1); |
228 |
< |
if (thiscolr[RED] == 1 && |
229 |
< |
thiscolr[GRN] == 1 && |
230 |
< |
thiscolr[BLU] == 1) { |
231 |
< |
for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
265 |
< |
copycolor(scanline[0], scanline[-1]); |
266 |
< |
scanline++; |
267 |
< |
len--; |
268 |
< |
} |
269 |
< |
rshift += 8; |
270 |
< |
} else { |
271 |
< |
colr_color(scanline[0], thiscolr); |
272 |
< |
scanline++; |
273 |
< |
len--; |
274 |
< |
rshift = 0; |
275 |
< |
} |
215 |
> |
register COLR *clrscan; |
216 |
> |
|
217 |
> |
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
218 |
> |
return(-1); |
219 |
> |
if (freadcolrs(clrscan, len, fp) < 0) |
220 |
> |
return(-1); |
221 |
> |
/* convert scanline */ |
222 |
> |
colr_color(scanline[0], clrscan[0]); |
223 |
> |
while (--len > 0) { |
224 |
> |
scanline++; clrscan++; |
225 |
> |
if (clrscan[0][RED] == clrscan[-1][RED] && |
226 |
> |
clrscan[0][GRN] == clrscan[-1][GRN] && |
227 |
> |
clrscan[0][BLU] == clrscan[-1][BLU] && |
228 |
> |
clrscan[0][EXP] == clrscan[-1][EXP]) |
229 |
> |
copycolor(scanline[0], scanline[-1]); |
230 |
> |
else |
231 |
> |
colr_color(scanline[0], clrscan[0]); |
232 |
|
} |
233 |
|
return(0); |
234 |
|
} |
235 |
|
|
236 |
|
|
237 |
+ |
void |
238 |
|
setcolr(clr, r, g, b) /* assign a short color value */ |
239 |
|
register COLR clr; |
240 |
|
double r, g, b; |
241 |
|
{ |
285 |
– |
double frexp(); |
242 |
|
double d; |
243 |
|
int e; |
244 |
|
|
245 |
|
d = r > g ? r : g; |
246 |
|
if (b > d) d = b; |
247 |
|
|
248 |
< |
if (d <= 0.0) { |
248 |
> |
if (d <= 1e-32) { |
249 |
|
clr[RED] = clr[GRN] = clr[BLU] = 0; |
250 |
|
clr[EXP] = 0; |
251 |
|
return; |
252 |
|
} |
253 |
|
|
254 |
< |
d = frexp(d, &e) * 256.0 / d; |
254 |
> |
d = frexp(d, &e) * 255.9999 / d; |
255 |
|
|
256 |
|
clr[RED] = r * d; |
257 |
|
clr[GRN] = g * d; |
260 |
|
} |
261 |
|
|
262 |
|
|
263 |
+ |
void |
264 |
|
colr_color(col, clr) /* convert short to float color */ |
265 |
|
register COLOR col; |
266 |
|
register COLR clr; |
267 |
|
{ |
268 |
< |
double ldexp(), f; |
268 |
> |
double f; |
269 |
|
|
270 |
|
if (clr[EXP] == 0) |
271 |
|
col[RED] = col[GRN] = col[BLU] = 0.0; |
275 |
|
col[GRN] = (clr[GRN] + 0.5)*f; |
276 |
|
col[BLU] = (clr[BLU] + 0.5)*f; |
277 |
|
} |
278 |
+ |
} |
279 |
+ |
|
280 |
+ |
|
281 |
+ |
int |
282 |
+ |
bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
283 |
+ |
register COLOR c1, c2; |
284 |
+ |
double md; |
285 |
+ |
{ |
286 |
+ |
register int i; |
287 |
+ |
|
288 |
+ |
for (i = 0; i < 3; i++) |
289 |
+ |
if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) || |
290 |
+ |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
291 |
+ |
return(1); |
292 |
+ |
return(0); |
293 |
|
} |