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/* libppm2.c - ppm utility library part 2
**
** Copyright (C) 1989 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 <string.h>
#include <errno.h>
#include "netpbm/pm_c_util.h"
#include "netpbm/mallocvar.h"
#include "ppm.h"
void
ppm_writeppminit(FILE* const fileP,
int const cols,
int const rows,
pixval const maxval,
int const forceplain) {
bool const plainFormat = forceplain || pm_plain_output;
if (maxval > PPM_OVERALLMAXVAL && !plainFormat)
pm_error("too-large maxval passed to ppm_writeppminit(): %d."
"Maximum allowed by the PPM format is %d.",
maxval, PPM_OVERALLMAXVAL);
fprintf(fileP, "%c%c\n%d %d\n%d\n",
PPM_MAGIC1,
plainFormat || maxval >= 1<<16 ? PPM_MAGIC2 : RPPM_MAGIC2,
cols, rows, maxval );
}
static void
putus(unsigned short const n,
FILE * const fileP) {
if (n >= 10)
putus(n / 10, fileP);
putc('0' + n % 10, fileP);
}
static void
format1bpsRow(const pixel * const pixelrow,
unsigned int const cols,
unsigned char * const rowBuffer) {
/* single byte samples. */
unsigned int col;
unsigned int bufferCursor;
bufferCursor = 0;
for (col = 0; col < cols; ++col) {
rowBuffer[bufferCursor++] = PPM_GETR(pixelrow[col]);
rowBuffer[bufferCursor++] = PPM_GETG(pixelrow[col]);
rowBuffer[bufferCursor++] = PPM_GETB(pixelrow[col]);
}
}
static void
format2bpsRow(const pixel * const pixelrow,
unsigned int const cols,
unsigned char * const rowBuffer) {
/* two byte samples. */
unsigned int col;
unsigned int bufferCursor;
bufferCursor = 0;
for (col = 0; col < cols; ++col) {
pixval const r = PPM_GETR(pixelrow[col]);
pixval const g = PPM_GETG(pixelrow[col]);
pixval const b = PPM_GETB(pixelrow[col]);
rowBuffer[bufferCursor++] = r >> 8;
rowBuffer[bufferCursor++] = (unsigned char)r;
rowBuffer[bufferCursor++] = g >> 8;
rowBuffer[bufferCursor++] = (unsigned char)g;
rowBuffer[bufferCursor++] = b >> 8;
rowBuffer[bufferCursor++] = (unsigned char)b;
}
}
static void
ppm_writeppmrowraw(FILE * const fileP,
const pixel * const pixelrow,
unsigned int const cols,
pixval const maxval ) {
unsigned int const bytesPerSample = maxval < 256 ? 1 : 2;
unsigned int const bytesPerRow = cols * 3 * bytesPerSample;
unsigned char * rowBuffer;
ssize_t rc;
MALLOCARRAY(rowBuffer, bytesPerRow);
if (rowBuffer == NULL)
pm_error("Unable to allocate memory for row buffer "
"for %u columns", cols);
if (maxval < 256)
format1bpsRow(pixelrow, cols, rowBuffer);
else
format2bpsRow(pixelrow, cols, rowBuffer);
rc = fwrite(rowBuffer, 1, bytesPerRow, fileP);
if (rc < 0)
pm_error("Error writing row. fwrite() errno=%d (%s)",
errno, strerror(errno));
else {
size_t const bytesWritten = rc;
if (bytesWritten != bytesPerRow)
pm_error("Error writing row. Short write of %u bytes "
"instead of %u", (unsigned)bytesWritten, bytesPerRow);
}
free(rowBuffer);
}
static void
ppm_writeppmrowplain(FILE * const fileP,
const pixel * const pixelrow,
unsigned int const cols,
pixval const maxval) {
unsigned int col;
unsigned int charcount;
charcount = 0;
for (col = 0; col < cols; ++col) {
if (charcount >= 65) {
putc('\n', fileP);
charcount = 0;
} else if (charcount > 0) {
putc(' ', fileP);
putc(' ', fileP);
charcount += 2;
}
putus(PPM_GETR(pixelrow[col]), fileP);
putc(' ', fileP);
putus(PPM_GETG(pixelrow[col]), fileP);
putc(' ', fileP);
putus(PPM_GETB(pixelrow[col]), fileP);
charcount += 11;
}
if (charcount > 0)
putc('\n', fileP);
}
void
ppm_writeppmrow(FILE * const fileP,
const pixel * const pixelrow,
int const cols,
pixval const maxval,
int const forceplain) {
if (forceplain || pm_plain_output || maxval >= 1<<16)
ppm_writeppmrowplain(fileP, pixelrow, cols, maxval);
else
ppm_writeppmrowraw(fileP, pixelrow, cols, maxval);
}
void
ppm_writeppm(FILE * const file,
pixel** const pixels,
int const cols,
int const rows,
pixval const maxval,
int const forceplain) {
int row;
ppm_writeppminit(file, cols, rows, maxval, forceplain);
for (row = 0; row < rows; ++row)
ppm_writeppmrow(file, pixels[row], cols, maxval, forceplain);
}
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