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/*
Copyright (C) 1992-2009 Spotworks LLC
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <png.h>
#include <setjmp.h>
#include "build/config.h"
#include "img.h"
#include "flam3.h"
#include <arpa/inet.h>
void write_png(FILE *file, void *image, int width, int height, int bpc) {
png_structp png_ptr;
png_infop info_ptr;
size_t i;
unsigned short testbe = 1;
void **rows = malloc(sizeof(void *) * height);
for (i = 0; i < height; i++)
rows[i] = (unsigned char *)image + i * width * 4 * bpc;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
if (setjmp(png_jmpbuf(png_ptr))) {
fclose(file);
png_destroy_write_struct(&png_ptr, &info_ptr);
perror("writing file");
return;
}
png_init_io(png_ptr, file);
png_set_IHDR(png_ptr, info_ptr, width, height, 8*bpc,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr, info_ptr);
/* Must set this after the write_info */
if (2==bpc && testbe != htons(testbe)) {
png_set_swap(png_ptr);
}
png_write_image(png_ptr, (png_bytepp) rows);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
free(rows);
}
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