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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.
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
/* save_png.c - save PNG 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 <png.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 PNG image
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*/
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Bool RSavePNG(RImage *img, const char *filename, char *title)
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{
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FILE *file;
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png_structp png_ptr;
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png_infop png_info_ptr;
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png_bytep png_row;
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RColor pixel;
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int x, y;
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int width = img->width;
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int height = img->height;
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file = fopen(filename, "wb");
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if (file == NULL) {
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RErrorCode = RERR_OPEN;
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return False;
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}
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/* Initialize write structure */
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (png_ptr == NULL) {
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fclose(file);
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RErrorCode = RERR_NOMEMORY;
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return False;
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}
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/* Initialize info structure */
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png_info_ptr = png_create_info_struct(png_ptr);
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if (png_info_ptr == NULL) {
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fclose(file);
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RErrorCode = RERR_NOMEMORY;
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return False;
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}
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/* Setup Exception handling */
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if (setjmp(png_jmpbuf (png_ptr))) {
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fclose(file);
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RErrorCode = RERR_INTERNAL;
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return False;
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}
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png_init_io(png_ptr, file);
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/* Write header (8 bit colour depth) */
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png_set_IHDR(png_ptr, png_info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
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PNG_FILTER_TYPE_BASE);
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/* Set title if any */
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if (title) {
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png_text title_text;
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title_text.compression = PNG_TEXT_COMPRESSION_NONE;
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title_text.key = "Title";
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title_text.text = title;
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png_set_text(png_ptr, png_info_ptr, &title_text, 1);
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}
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png_write_info(png_ptr, png_info_ptr);
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/* Allocate memory for one row (3 bytes per pixel - RGB) */
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png_row = (png_bytep) malloc(3 * width * sizeof(png_byte));
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/* Write image data */
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for (y = 0; y < height; y++) {
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for (x = 0; x < width; x++) {
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png_byte *ptr;
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RGetPixel(img, x, y, &pixel);
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ptr = &(png_row[x * 3]);
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ptr[0] = pixel.red;
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ptr[1] = pixel.green;
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ptr[2] = pixel.blue;
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}
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png_write_row(png_ptr, png_row);
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}
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/* End write */
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png_write_end(png_ptr, NULL);
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/* Clean */
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fclose(file);
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if (png_info_ptr != NULL)
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png_free_data(png_ptr, png_info_ptr, PNG_FREE_ALL, -1);
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if (png_ptr != NULL)
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png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
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if (png_row != NULL)
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free(png_row);
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return True;
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}
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