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//
// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
//
// This software may be used and distributed according to the terms
// of the GNU General Public License, incorporated herein by reference.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
extern "C" {
#include <jpeglib.h>
}
#include "JPEGOutputImage.H"
JPEGOutputImage::JPEGOutputImage(const char *f, int q) : OutputImage() {
file = strdup(f);
fp = NULL;
row = NULL;
quality = q;
}
JPEGOutputImage::~JPEGOutputImage() {
if (row)
free(row);
if (file)
free(file);
}
int
JPEGOutputImage::init_internal() {
if (row)
free(row);
row = NULL;
row = (unsigned char*) calloc(3 * W, sizeof(char));
if (!row) {
perror("calloc");
return 1;
}
if (fp)
fclose(fp);
if ((fp = fopen(file, "wb")) == NULL) {
fprintf(stderr, "can't open %s\n", file);
return 1;
}
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, fp);
cinfo.image_width = W;
cinfo.image_height = H;
cinfo.input_components = 3; /* # of color components per pixel */
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, quality, TRUE);
jpeg_start_compress(&cinfo, TRUE);
return 0;
}
int
JPEGOutputImage::set_pixel_internal(int x, int r, int g, int b) {
row[x*3+0] = (unsigned char) (r / 255);
row[x*3+1] = (unsigned char) (g / 255);
row[x*3+2] = (unsigned char) (b / 255);
return 0;
}
int
JPEGOutputImage::next_line_internal() {
JSAMPROW row_pointer[1];
row_pointer[0] = row;
jpeg_write_scanlines(&cinfo, row_pointer, 1);
memset(row, 0, sizeof(char) * 3 * W);
return 0;
}
int
JPEGOutputImage::done_internal() {
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
if (fp)
fclose(fp);
fp = NULL;
if (row)
free(row);
row = NULL;
if (fp)
fclose(fp);
fp = NULL;
return 0;
}
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