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/* pbmtoicon.c - read a PBM image and produce a Sun icon file
**
** Copyright (C) 1988 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.
*/
/* 2006.10 (afu)
Changed bitrow from plain to raw, read function from pbm_readpbmrow() to
pbm_readpbmrow_packed. Applied wordint to scoop up 16 bit output items.
putitem changed to better express the output format.
Retired bitwise transformation functions.
*/
#include "wordaccess.h"
#include "pbm.h"
static unsigned short int itemBuff[8];
static unsigned int itemCnt; /* takes values 0 to 8 */
FILE * putFp;
static void
putinit(FILE * const ofP) {
putFp = ofP;
itemCnt = 0;
}
static void
putitem(wordint const item) {
if (itemCnt == 8 ) {
/* Buffer is full. Write out one line. */
int rc;
rc = fprintf(putFp,
"\t0x%04x,0x%04x,0x%04x,0x%04x,"
"0x%04x,0x%04x,0x%04x,0x%04x,\n",
itemBuff[0],itemBuff[1],itemBuff[2],itemBuff[3],
itemBuff[4],itemBuff[5],itemBuff[6],itemBuff[7]);
if (rc < 0)
pm_error("fprintf() failed to write Icon bitmap");
itemCnt = 0;
}
itemBuff[itemCnt++] = item & 0xffff; /* Only lower 16 bits are used */
}
static void
putterm(void) {
unsigned int i;
for (i = 0; i < itemCnt; ++i) {
int rc;
rc = fprintf(putFp, "%s0x%04x%c", i == 0 ? "\t" : "", itemBuff[i],
i == itemCnt - 1 ? '\n' : ',');
if (rc < 0)
pm_error("fprintf() failed to write Icon bitmap");
}
}
static void
writeIconHeader(FILE * const ofP,
unsigned int const width,
unsigned int const height) {
int rc;
rc = fprintf(ofP,
"/* Format_version=1, Width=%u, Height=%u", width, height);
if (rc < 0)
pm_error("fprintf() failed to write Icon header");
rc = fprintf(ofP, ", Depth=1, Valid_bits_per_item=16\n */\n");
if (rc < 0)
pm_error("fprintf() failed to write Icon header");
}
static void
writeIcon(FILE * const ifP,
unsigned int const cols,
unsigned int const rows,
int const format,
FILE * const ofP) {
unsigned int const wordintSize = sizeof(wordint) * 8;
/* wordintSize is usually 32 or 64 bits. Must be at least 24. */
unsigned int const items = (cols + 15) / 16;
unsigned int const bitrowBytes = pbm_packed_bytes(cols);
unsigned int const pad = items * 16 - cols;
/* 'padleft' is added to the output. 'padbyte' is for cleaning
the input
*/
unsigned int const padleft = pad / 2;
unsigned int const padbyte = bitrowBytes * 8 - cols;
unsigned int const shift = (wordintSize - 24) + padleft;
unsigned char * bitbuffer;
unsigned char * bitrow;
unsigned int row;
bitbuffer = pbm_allocrow_packed(cols + wordintSize);
bitrow = &bitbuffer[1];
bitbuffer[0] = 0;
bitrow[bitrowBytes] = 0;
writeIconHeader(ofP, cols + pad, rows);
putinit(ofP);
for (row = 0; row < rows; ++row) {
unsigned int itemSeq;
pbm_readpbmrow_packed(ifP, bitrow, cols, format);
/* Clear post-data junk in final partial byte */
if (padbyte > 0) {
bitrow[bitrowBytes-1] >>= padbyte;
bitrow[bitrowBytes-1] <<= padbyte;
}
for (itemSeq = 0; itemSeq < items; ++itemSeq) {
/* Scoop up bits, shift-align, send to format & print function.
An item is 16 bits, typically spread over 3 bytes due to
left-padding. We use wordint here to scoop up 4 (or more)
consecutive bytes. An item always resides within the higher
24 bits of each scoop. It is essential to use wordint
(or rather the wordaccess function bytesToWordInt() );
simple long, uint_32t, etc. do not work for they are not
shift-tolerant.
*/
wordint const scoop = bytesToWordint(&bitbuffer[itemSeq*2]);
putitem (scoop >> shift);
}
}
putterm();
}
int
main(int argc,
char * argv[]) {
FILE * ifP;
int rows, cols;
int format;
const char * inputFileName;
pbm_init(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments (%u). "
"Only argument is optional input file", argc-1);
if (argc-1 == 1)
inputFileName = argv[1];
else
inputFileName = "-";
ifP = pm_openr(inputFileName);
pbm_readpbminit(ifP, &cols, &rows, &format);
writeIcon(ifP, cols, rows, format, stdout);
pm_close(ifP);
return 0;
}
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