diff options
Diffstat (limited to 'editor/ppmbrighten.c')
| -rw-r--r-- | editor/ppmbrighten.c | 259 |
1 files changed, 65 insertions, 194 deletions
diff --git a/editor/ppmbrighten.c b/editor/ppmbrighten.c index 96bca478..0446bb75 100644 --- a/editor/ppmbrighten.c +++ b/editor/ppmbrighten.c @@ -1,28 +1,19 @@ -/* ppmbrighten.c - allow user control over Value and Saturation of PPM file -** -** Copyright (C) 1989 by Jef Poskanzer. -** Copyright (C) 1990 by Brian Moffet. -** -** Permission to use, copy, modify, and distribute this software and its -** documentation for any purpose and without fee is hereby granted, provided -** that the above copyright notice appear in all copies and that both that -** copyright notice and this permission notice appear in supporting -** documentation. This software is provided "as is" without express or -** implied warranty. -*/ +/*============================================================================= + ppmbrighten +=============================================================================== + Change Value and Saturation of PPM image. +=============================================================================*/ #include "pm_c_util.h" #include "ppm.h" #include "shhopt.h" #include "mallocvar.h" -#define MULTI 1000 - -struct cmdlineInfo { +struct CmdlineInfo { /* All the information the user supplied in the command line, in a form easy for the program to use. */ - const char * inputFilespec; /* '-' if stdin */ + const char * inputFileName; /* '-' if stdin */ float saturation; float value; unsigned int normalize; @@ -32,7 +23,7 @@ struct cmdlineInfo { static void parseCommandLine(int argc, const char ** argv, - struct cmdlineInfo * const cmdlineP) { + struct CmdlineInfo * const cmdlineP) { /*---------------------------------------------------------------------------- parse program command line described in Unix standard form by argc and argv. Return the information in the options as *cmdlineP. @@ -63,12 +54,11 @@ parseCommandLine(int argc, const char ** argv, OPTENT3(0, "normalize", OPT_FLAG, NULL, &cmdlineP->normalize, 0 ); - opt.opt_table = option_def; opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */ opt.allowNegNum = FALSE; /* We have no parms that are negative numbers */ - pm_optParseOptions3( &argc, (char **)argv, opt, sizeof(opt), 0); + pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0); /* Uses and sets argc, argv, and some of *cmdlineP and others. */ if (saturationSpec) { @@ -90,172 +80,41 @@ parseCommandLine(int argc, const char ** argv, cmdlineP->value = 1.0; if (argc-1 < 1) - cmdlineP->inputFilespec = "-"; + cmdlineP->inputFileName = "-"; else if (argc-1 == 1) - cmdlineP->inputFilespec = argv[1]; + cmdlineP->inputFileName = argv[1]; else pm_error("Program takes at most one argument: file specification"); } -static __inline__ unsigned int -mod(int const dividend, unsigned int const divisor) { - - int remainder = dividend % (int)divisor; - - if (remainder < 0) - return divisor + remainder; - else - return (unsigned int) remainder; -} - - - -static void -RGBtoHSV(pixel const color, - pixval const maxval, - unsigned int * const hP, - unsigned int * const sP, - unsigned int * const vP) { - - unsigned int const R = (MULTI * PPM_GETR(color) + maxval - 1) / maxval; - unsigned int const G = (MULTI * PPM_GETG(color) + maxval - 1) / maxval; - unsigned int const B = (MULTI * PPM_GETB(color) + maxval - 1) / maxval; - - unsigned int s, v; - unsigned int t; - unsigned int sector; - - v = MAX(R, MAX(G, B)); - - t = MIN(R, MIN(G, B)); - - if (v == 0) - s = 0; - else - s = ((v - t)*MULTI)/v; - - if (s == 0) - sector = 0; - else { - unsigned int const cr = (MULTI * (v - R))/(v - t); - unsigned int const cg = (MULTI * (v - G))/(v - t); - unsigned int const cb = (MULTI * (v - B))/(v - t); - - if (R == v) - sector = mod((int)(cb - cg), 6*MULTI); - else if (G == v) - sector = mod((int)((2*MULTI) + cr - cb), 6*MULTI); - else if (B == v) - sector = mod((int)((4*MULTI) + cg - cr), 6*MULTI); - else - pm_error("Internal error: neither r, g, nor b is maximum"); - } - - *hP = sector * 60; - *sP = s; - *vP = v; -} - - - static void -HSVtoRGB(unsigned int const h, - unsigned int const s, - unsigned int const v, - pixval const maxval, - pixel * const colorP) { - - unsigned int R, G, B; - - if (s == 0) { - R = v; - G = v; - B = v; - } else { - unsigned int const sectorSize = 60 * MULTI; - /* Color wheel is divided into six 60 degree sectors. */ - unsigned int const sector = (h/sectorSize); - /* The sector in which our color resides. Value is in 0..5 */ - unsigned int const f = (h - sector*sectorSize)/60; - /* The fraction of the way the color is from one side of - our sector to the other side, going clockwise. Value is - in [0, MULTI). - */ - unsigned int const m = (v * (MULTI - s)) / MULTI; - unsigned int const n = (v * (MULTI - (s * f)/MULTI)) / MULTI; - unsigned int const k = (v * (MULTI - (s * (MULTI - f))/MULTI)) / MULTI; - - switch (sector) { - case 0: - R = v; - G = k; - B = m; - break; - case 1: - R = n; - G = v; - B = m; - break; - case 2: - R = m; - G = v; - B = k; - break; - case 3: - R = m; - G = n; - B = v; - break; - case 4: - R = k; - G = m; - B = v; - break; - case 5: - R = v; - G = m; - B = n; - break; - default: - pm_error("Invalid H value passed to HSVtoRGB: %u/%u", h, MULTI); - } - } - PPM_ASSIGN(*colorP, - (R * maxval) / MULTI, - (G * maxval) / MULTI, - (B * maxval) / MULTI); -} - - - -static void -getMinMax(FILE * const ifP, - int const cols, - int const rows, - pixval const maxval, - int const format, - unsigned int * const minValueP, - unsigned int * const maxValueP) { +getMinMax(FILE * const ifP, + unsigned int const cols, + unsigned int const rows, + pixval const maxval, + int const format, + double * const minValueP, + double * const maxValueP) { pixel * pixelrow; - unsigned int minValue, maxValue; - int row; + double minValue, maxValue; + unsigned int row; pixelrow = ppm_allocrow(cols); - maxValue = 0; - minValue = MULTI; - for (row = 0; row < rows; ++row) { + for (row = 0, minValue = 65536.0, maxValue = 0.0; row < rows; ++row) { unsigned int col; + ppm_readppmrow(ifP, pixelrow, cols, maxval, format); + for (col = 0; col < cols; ++col) { - unsigned int H, S, V; + struct hsv const pixhsv = + ppm_hsv_from_color(pixelrow[col], maxval); - RGBtoHSV(pixelrow[col], maxval, &H, &S, &V); - maxValue = MAX(maxValue, V); - minValue = MIN(minValue, V); + maxValue = MAX(maxValue, pixhsv.v); + minValue = MIN(minValue, pixhsv.v); } } ppm_freerow(pixelrow); @@ -269,21 +128,22 @@ getMinMax(FILE * const ifP, int main(int argc, const char ** argv) { - struct cmdlineInfo cmdline; + double const EPSILON = 1.0e-5; + struct CmdlineInfo cmdline; FILE * ifP; - pixval minValue, maxValue; pixel * pixelrow; pixval maxval; int rows, cols, format, row; + double minValue, maxValue; pm_proginit(&argc, argv); parseCommandLine(argc, argv, &cmdline); if (cmdline.normalize) - ifP = pm_openr_seekable(cmdline.inputFilespec); + ifP = pm_openr_seekable(cmdline.inputFileName); else - ifP = pm_openr(cmdline.inputFilespec); + ifP = pm_openr(cmdline.inputFileName); ppm_readppminit(ifP, &cols, &rows, &maxval, &format); @@ -292,17 +152,17 @@ main(int argc, const char ** argv) { pm_tell2(ifP, &rasterPos, sizeof(rasterPos)); getMinMax(ifP, cols, rows, maxval, format, &minValue, &maxValue); pm_seek2(ifP, &rasterPos, sizeof(rasterPos)); - if (maxValue > minValue) { - pm_message("Minimum value %u%% of full intensity " + if (maxValue - minValue > EPSILON) { + pm_message("Minimum value %.0f%% of full intensity " "being remapped to zero.", - (minValue*100+MULTI/2)/MULTI); - pm_message("Maximum value %u%% of full intensity " + (minValue * 100.0)); + pm_message("Maximum value %.0f%% of full intensity " "being remapped to full.", - (maxValue*100+MULTI/2)/MULTI); + (maxValue * 100.0)); } else - pm_message("Sole intensity value %u%% of full intensity " + pm_message("Sole value of %.0f%% of full intensity " "not being remapped", - (minValue*100+MULTI/2)/MULTI); + (maxValue * 100.0)); } pixelrow = ppm_allocrow(cols); @@ -311,37 +171,48 @@ main(int argc, const char ** argv) { for (row = 0; row < rows; ++row) { unsigned int col; + ppm_readppmrow(ifP, pixelrow, cols, maxval, format); + for (col = 0; col < cols; ++col) { - unsigned int H, S, V; + struct hsv pixhsv; - RGBtoHSV(pixelrow[col], maxval, &H, &S, &V); + pixhsv = ppm_hsv_from_color(pixelrow[col], maxval); + /* initial value */ if (cmdline.normalize) { - if (maxValue > minValue) { - V -= minValue; - V = (V * MULTI) / - (MULTI - (minValue+MULTI-maxValue)); - } + if (maxValue - minValue > EPSILON) + pixhsv.v = (pixhsv.v - minValue) / (maxValue - minValue); } - - S = MIN(MULTI, (unsigned int) (S * cmdline.saturation + 0.5)); - V = MIN(MULTI, (unsigned int) (V * cmdline.value + 0.5)); - - HSVtoRGB(H, S, V, maxval, &pixelrow[col]); + pixhsv.s = pixhsv.s * cmdline.saturation; + pixhsv.s = MAX(0.0, MIN(1.0, pixhsv.s)); + pixhsv.v = pixhsv.v * cmdline.value; + pixhsv.v = MAX(0.0, MIN(1.0, pixhsv.v)); + pixelrow[col] = ppm_color_from_hsv(pixhsv, maxval); } - ppm_writeppmrow(stdout, pixelrow, cols, maxval, 0); } ppm_freerow(pixelrow); pm_close(ifP); - /* If the program failed, it previously aborted with nonzero completion - code, via various function calls. + /* If the program failed, it previously aborted with nonzero exit status + via various function calls. */ return 0; } +/** +** Copyright (C) 1989 by Jef Poskanzer. +** Copyright (C) 1990 by Brian Moffet. +** +** Permission to use, copy, modify, and distribute this software and its +** documentation for any purpose and without fee is hereby granted, provided +** that the above copyright notice appear in all copies and that both that +** copyright notice and this permission notice appear in supporting +** documentation. This software is provided "as is" without express or +** implied warranty. +*/ + |