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/* save_jpeg.c - save JPEG image
*
* Raster graphics library
*
* Copyright (c) 2023 Window Maker Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <jpeglib.h>
#include "wraster.h"
#include "imgformat.h"
#include "wr_i18n.h"
/*
* Save RImage to JPEG image
*/
Bool RSaveJPEG(RImage *img, const char *filename, char *title)
{
FILE *file;
int x, y, img_depth;
char *buffer;
RColor pixel;
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPROW row_pointer;
file = fopen(filename, "wb");
if (!file) {
RErrorCode = RERR_OPEN;
return False;
}
if (img->format == RRGBAFormat)
img_depth = 4;
else
img_depth = 3;
/* collect separate RGB values to a buffer */
buffer = malloc(sizeof(char) * 3 * img->width * img->height);
for (y = 0; y < img->height; y++) {
for (x = 0; x < img->width; x++) {
RGetPixel(img, x, y, &pixel);
buffer[y*img->width*3+x*3+0] = (char)(pixel.red);
buffer[y*img->width*3+x*3+1] = (char)(pixel.green);
buffer[y*img->width*3+x*3+2] = (char)(pixel.blue);
}
}
/* Setup Exception handling */
cinfo.err = jpeg_std_error(&jerr);
/* Initialize cinfo structure */
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, file);
cinfo.image_width = img->width;
cinfo.image_height = img->height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, 85, TRUE);
jpeg_start_compress(&cinfo, TRUE);
/* Set title if any */
if (title)
jpeg_write_marker(&cinfo, JPEG_COM, (const JOCTET*)title, strlen(title));
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer = (JSAMPROW) &buffer[cinfo.next_scanline * img_depth * img->width];
jpeg_write_scanlines(&cinfo, &row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
/* Clean */
free(buffer);
fclose(file);
return True;
}
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