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/* rawtoppm.c - convert raw RGB bytes into a portable pixmap
**
** Copyright (C) 1991 by Jef Poskanzer.
**
** 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.
*/
#include <math.h>
#include "ppm.h"
enum order { ORD_RGB, ORD_RBG, ORD_GRB, ORD_GBR, ORD_BRG, ORD_BGR };
enum interleave { INT_PIX, INT_ROW };
static void
dorowskip(FILE * const ifP,
int const rowskip) {
unsigned int i;
for (i = 0; i < rowskip; ++i) {
int const val = getc(ifP);
if (val == EOF)
pm_error("EOF / read error");
}
}
static void
doRowPixInterleave(pixel * const pixrow,
unsigned int const cols,
FILE * const ifP,
enum order const order,
int const rowskip) {
unsigned int col;
for (col = 0; col < cols; ++col) {
int const val1 = getc(ifP);
int const val2 = getc(ifP);
int const val3 = getc(ifP);
if (val1 == EOF)
pm_error("EOF / read error");
if (val2 == EOF)
pm_error("EOF / read error");
if (val3 == EOF)
pm_error("EOF / read error");
switch (order) {
case ORD_RGB:
PPM_ASSIGN(pixrow[col], val1, val2, val3);
break;
case ORD_RBG:
PPM_ASSIGN(pixrow[col], val1, val3, val2);
break;
case ORD_GRB:
PPM_ASSIGN(pixrow[col], val2, val1, val3);
break;
case ORD_GBR:
PPM_ASSIGN(pixrow[col], val3, val1, val2);
break;
case ORD_BRG:
PPM_ASSIGN(pixrow[col], val2, val3, val1);
break;
case ORD_BGR:
PPM_ASSIGN(pixrow[col], val3, val2, val1);
break;
}
}
dorowskip(ifP, rowskip);
}
static void
doRowRowInterleave(pixel * const pixrow,
unsigned int const cols,
FILE * const ifP,
enum order const order,
int const rowskip,
pixval * const grow1,
pixval * const grow2,
pixval * const grow3) {
unsigned int col;
for (col = 0; col < cols; ++col) {
int const val1 = getc(ifP);
if (val1 == EOF)
pm_error("EOF / read error");
grow1[col] = val1;
}
dorowskip(ifP, rowskip);
for (col = 0; col < cols; ++col) {
int const val2 = getc(ifP);
if (val2 == EOF)
pm_error( "EOF / read error" );
grow2[col] = val2;
}
dorowskip(ifP, rowskip);
for (col = 0; col < cols; ++col) {
int const val3 = getc(ifP);
if (val3 == EOF)
pm_error( "EOF / read error" );
grow3[col] = val3;
}
dorowskip(ifP, rowskip);
for (col = 0; col < cols; ++col) {
switch (order) {
case ORD_RGB:
PPM_ASSIGN(pixrow[col], grow1[col], grow2[col], grow3[col]);
break;
case ORD_RBG:
PPM_ASSIGN(pixrow[col], grow1[col], grow3[col], grow2[col]);
break;
case ORD_GRB:
PPM_ASSIGN(pixrow[col], grow2[col], grow1[col], grow3[col]);
break;
case ORD_GBR:
PPM_ASSIGN(pixrow[col], grow3[col], grow1[col], grow2[col]);
break;
case ORD_BRG:
PPM_ASSIGN(pixrow[col], grow2[col], grow3[col], grow1[col]);
break;
case ORD_BGR:
PPM_ASSIGN(pixrow[col], grow3[col], grow2[col], grow1[col]);
break;
}
}
}
int
main(int argc, const char * argv[]) {
pixval const maxval = 255;
FILE * ifP;
pixel * pixrow;
int argn, headerskip, rowskip, rows, cols, row, i;
enum order order;
enum interleave interleave;
gray * grow1;
gray * grow2;
gray * grow3;
const char* const usage = "[-headerskip N] [-rowskip N] [-rgb|-rbg|-grb|-gbr|-brg|-bgr] [-interpixel|-interrow] <width> <height> [rawfile]";
pm_proginit(&argc, argv);
argn = 1;
headerskip = 0;
rowskip = 0;
order = ORD_RGB;
interleave = INT_PIX;
while ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-headerskip", 2 ) )
{
++argn;
if ( argn >= argc )
pm_usage( usage );
headerskip = atoi( argv[argn] );
}
else if ( pm_keymatch( argv[argn], "-rowskip", 3 ) )
{
++argn;
if ( argn >= argc )
pm_usage( usage );
rowskip = atoi( argv[argn] );
}
else if ( pm_keymatch( argv[argn], "-rgb", 3 ) )
order = ORD_RGB;
else if ( pm_keymatch( argv[argn], "-rbg", 3 ) )
order = ORD_RBG;
else if ( pm_keymatch( argv[argn], "-grb", 3 ) )
order = ORD_GRB;
else if ( pm_keymatch( argv[argn], "-gbr", 3 ) )
order = ORD_GBR;
else if ( pm_keymatch( argv[argn], "-brg", 3 ) )
order = ORD_BRG;
else if ( pm_keymatch( argv[argn], "-bgr", 3 ) )
order = ORD_BGR;
else if ( pm_keymatch( argv[argn], "-interpixel", 7 ) )
interleave = INT_PIX;
else if ( pm_keymatch( argv[argn], "-interrow", 7 ) )
interleave = INT_ROW;
else
pm_usage( usage );
++argn;
}
if ( argn + 2 > argc )
pm_usage( usage );
cols = pm_parse_width(argv[argn++]);
rows = pm_parse_height(argv[argn++]);
if ( argn < argc )
{
ifP = pm_openr( argv[argn] );
++argn;
}
else
ifP = stdin;
if ( argn != argc )
pm_usage( usage );
ppm_writeppminit(stdout, cols, rows, (pixval) 255, 0);
pixrow = ppm_allocrow(cols);
if (interleave == INT_ROW) {
grow1 = pgm_allocrow(cols);
grow2 = pgm_allocrow(cols);
grow3 = pgm_allocrow(cols);
}
for (i = 0; i < headerskip; ++i) {
int const val = getc(ifP);
if (val == EOF)
pm_error("EOF / read error");
}
for (row = 0; row < rows; ++row) {
switch (interleave) {
case INT_PIX:
doRowPixInterleave(pixrow, cols, ifP, order, rowskip);
break;
case INT_ROW:
doRowRowInterleave(pixrow, cols, ifP, order, rowskip,
grow1, grow2, grow3);
break;
}
ppm_writeppmrow(stdout, pixrow, cols, maxval, 0);
}
pm_close( ifP );
pm_close( stdout );
exit( 0 );
}
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