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//
// "$Id$"
//
// Fl_PNM_Image routines.
//
// Copyright 1997-2010 by Easy Software Products.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
// Contents:
//
// Fl_PNM_Image::Fl_PNM_Image() - Load a PNM image...
//
//
// Include necessary header files...
//
#include <FL/Fl.H>
#include <FL/Fl_PNM_Image.H>
#include <stdio.h>
#include <stdlib.h>
#include <FL/fl_utf8.h>
#include "flstring.h"
//
// 'Fl_PNM_Image::Fl_PNM_Image()' - Load a PNM image...
//
/**
The constructor loads the named PNM image.
The destructor frees all memory and server resources that are used by
the image.
Use Fl_Image::fail() to check if Fl_PNM_Image failed to load. fail() returns
ERR_FILE_ACCESS if the file could not be opened or read, ERR_FORMAT if the
PNM format could not be decoded, and ERR_NO_IMAGE if the image could not
be loaded for another reason.
*/
Fl_PNM_Image::Fl_PNM_Image(const char *name) // I - File to read
: Fl_RGB_Image(0,0,0) {
FILE *fp; // File pointer
int x, y; // Looping vars
char line[1024], // Input line
*lineptr; // Pointer in line
uchar *ptr, // Pointer to pixel values
byte, // Byte from file
bit; // Bit in pixel
int format, // Format of PNM file
val, // Pixel value
maxval; // Maximum pixel value
if ((fp = fl_fopen(name, "rb")) == NULL) {
ld(ERR_FILE_ACCESS);
return;
}
//
// Read the file header in the format:
//
// Pformat
// # comment1
// # comment2
// ...
// # commentN
// width
// height
// max sample
//
lineptr = fgets(line, sizeof(line), fp);
if (!lineptr) {
fclose(fp);
Fl::error("Early end-of-file in PNM file \"%s\"!", name);
ld(ERR_FILE_ACCESS);
return;
}
lineptr ++;
format = atoi(lineptr);
while (isdigit(*lineptr)) lineptr ++;
if (format == 7) lineptr = (char *)"";
while (lineptr != NULL && w() == 0) {
if (*lineptr == '\0' || *lineptr == '#') {
lineptr = fgets(line, sizeof(line), fp);
} else if (isdigit(*lineptr)) {
w(strtol(lineptr, &lineptr, 10));
} else lineptr ++;
}
while (lineptr != NULL && h() == 0) {
if (*lineptr == '\0' || *lineptr == '#') {
lineptr = fgets(line, sizeof(line), fp);
} else if (isdigit(*lineptr)) {
h(strtol(lineptr, &lineptr, 10));
} else lineptr ++;
}
if (format != 1 && format != 4) {
maxval = 0;
while (lineptr != NULL && maxval == 0) {
if (*lineptr == '\0' || *lineptr == '#') {
lineptr = fgets(line, sizeof(line), fp);
} else if (isdigit(*lineptr)) {
maxval = strtol(lineptr, &lineptr, 10);
} else lineptr ++;
}
} else maxval = 1;
// Allocate memory...
if (format == 1 || format == 2 || format == 4 || format == 5) d(1);
else d(3);
// printf("%s = %dx%dx%d\n", name, w(), h(), d());
if (((size_t)w()) * h() * d() > max_size() ) {
Fl::warning("PNM file \"%s\" is too large!\n", name);
fclose(fp);
w(0); h(0); d(0); ld(ERR_FORMAT);
return;
}
array = new uchar[w() * h() * d()];
alloc_array = 1;
// Read the image file...
for (y = 0; y < h(); y ++) {
ptr = (uchar *)array + y * w() * d();
switch (format) {
case 1 :
for (x = w(); x > 0; x --)
if (fscanf(fp, "%d", &val) == 1) *ptr++ = (uchar)(255 * (1-val));
break;
case 2 :
for (x = w(); x > 0; x --)
if (fscanf(fp, "%d", &val) == 1) *ptr++ = (uchar)(255 * val / maxval);
break;
case 3 :
for (x = w(); x > 0; x --) {
if (fscanf(fp, "%d", &val) == 1) *ptr++ = (uchar)(255 * val / maxval);
if (fscanf(fp, "%d", &val) == 1) *ptr++ = (uchar)(255 * val / maxval);
if (fscanf(fp, "%d", &val) == 1) *ptr++ = (uchar)(255 * val / maxval);
}
break;
case 4 :
for (x = w(), byte = (uchar)getc(fp), bit = 128; x > 0; x --) {
if ((byte & bit) == 0) *ptr++ = 255; // 0 bit for white pixel
else *ptr++ = 0; // 1 bit for black pixel
if (bit > 1) bit >>= 1;
else {
bit = 128;
if (x > 1) byte = (uchar)getc(fp);
}
}
break;
case 5 :
case 6 :
if (maxval < 256) {
if (fread(ptr, w(), d(), fp)) { /* ignored */ }
} else {
for (x = d() * w(); x > 0; x --) {
val = (uchar)getc(fp);
val = (val<<8)|(uchar)getc(fp);
*ptr++ = (255*val)/maxval;
}
}
break;
case 7 : /* XV 3:3:2 thumbnail format */
for (x = w(); x > 0; x --) {
byte = (uchar)getc(fp);
*ptr++ = (uchar)(255 * ((byte >> 5) & 7) / 7);
*ptr++ = (uchar)(255 * ((byte >> 2) & 7) / 7);
*ptr++ = (uchar)(255 * (byte & 3) / 3);
}
break;
}
}
fclose(fp);
}
//
// End of "$Id$".
//
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