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c8883fdbb0
This patch adds the RSaveTitledImage() function to the WRaster lib to be able to save file on disk either as a PNG or a JPEG file. Those two formats depends on optional external libs. The function can take an optional title/comment which will be save inside the file. The WRaster lib and header versions are bumped.
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* save_jpeg.c - save JPEG image
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*
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* Raster graphics library
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*
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* Copyright (c) 2023 Window Maker Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <jpeglib.h>
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#include "wraster.h"
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#include "imgformat.h"
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#include "wr_i18n.h"
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/*
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* Save RImage to JPEG image
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*/
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Bool RSaveJPEG(RImage *img, const char *filename, char *title)
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{
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FILE *file;
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int x, y, img_depth;
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char *buffer;
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RColor pixel;
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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JSAMPROW row_pointer;
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file = fopen(filename, "wb");
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if (!file) {
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RErrorCode = RERR_OPEN;
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return False;
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}
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if (img->format == RRGBAFormat)
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img_depth = 4;
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else
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img_depth = 3;
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/* collect separate RGB values to a buffer */
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buffer = malloc(sizeof(char) * 3 * img->width * img->height);
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for (y = 0; y < img->height; y++) {
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for (x = 0; x < img->width; x++) {
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RGetPixel(img, x, y, &pixel);
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buffer[y*img->width*3+x*3+0] = (char)(pixel.red);
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buffer[y*img->width*3+x*3+1] = (char)(pixel.green);
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buffer[y*img->width*3+x*3+2] = (char)(pixel.blue);
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}
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}
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/* Setup Exception handling */
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cinfo.err = jpeg_std_error(&jerr);
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/* Initialize cinfo structure */
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jpeg_create_compress(&cinfo);
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jpeg_stdio_dest(&cinfo, file);
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cinfo.image_width = img->width;
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cinfo.image_height = img->height;
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cinfo.input_components = 3;
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cinfo.in_color_space = JCS_RGB;
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jpeg_set_defaults(&cinfo);
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jpeg_set_quality(&cinfo, 85, TRUE);
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jpeg_start_compress(&cinfo, TRUE);
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/* Set title if any */
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if (title)
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jpeg_write_marker(&cinfo, JPEG_COM, (const JOCTET*)title, strlen(title));
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while (cinfo.next_scanline < cinfo.image_height) {
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row_pointer = (JSAMPROW) &buffer[cinfo.next_scanline * img_depth * img->width];
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jpeg_write_scanlines(&cinfo, &row_pointer, 1);
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}
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jpeg_finish_compress(&cinfo);
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/* Clean */
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free(buffer);
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fclose(file);
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return True;
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}
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