--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ccdemos/image.c	Sun Nov 25 17:58:29 2007 +0100
@@ -0,0 +1,114 @@
+/* This code is part of RGB Image Library
+   see URL: xxx */
+
+/**************************************************************************
+
+RGB Image Library (rgbimagelib)
+File: image.c
+
+Copyright (c) 2006 Radek Brich
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <png.h>
+
+#include "image.h"
+
+int new_image(struct image **img, int width, int height, int pixelsize)
+{
+	*img = (struct image *) malloc(sizeof(struct image));
+	(*img)->pixel_size = pixelsize;
+	(*img)->width = width;
+	(*img)->height = height;
+	(*img)->data = (char *) malloc(width * height * pixelsize);
+	return(0);
+}
+
+int destroy_image(struct image **img)
+{
+	free((*img)->data);
+	free(*img);
+	*img = NULL;
+}
+
+/* funkce pro ulozeni obrazku do PNG souboru (vyuziva knihovnu libpng) */
+int save_png(const char *fname, struct image *img)
+{
+	int y; /* pomocna promenna pro pruchod radku obrazu */
+	FILE *f;
+	png_structp png;   /* PNG data */
+	png_infop pnginfo; /* PNG info */
+	char *data;
+
+	if ((f = fopen(fname, "wb")) == NULL)
+		return (0);
+
+	png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+	if (!png) {
+		fclose(f);
+		return (0);
+	}
+
+	pnginfo = png_create_info_struct(png);
+	if (!pnginfo) {
+		fclose(f);
+		png_destroy_write_struct(&png, 0);
+		return (0);
+	}
+
+	if (setjmp(png_jmpbuf(png))) {
+		fclose(f);
+		png_destroy_write_struct(&png, &pnginfo);
+		return (0);
+	}
+
+	/* predat knihovne PNG ukazatel na soubor */
+	png_init_io(png, f);
+
+	/* parametry PNG */
+	png_set_compression_level(png, Z_BEST_COMPRESSION);
+	png_set_IHDR(png, pnginfo, img->width, img->height, 8, PNG_COLOR_TYPE_RGB,
+		PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+		PNG_FILTER_TYPE_DEFAULT);
+	png_set_sRGB(png, pnginfo, PNG_sRGB_INTENT_PERCEPTUAL);
+	png_set_sRGB_gAMA_and_cHRM(png, pnginfo, PNG_INFO_sRGB);
+
+	/* zapsat hlavicku */
+	png_write_info(png, pnginfo);
+
+	/* zapsat data */
+	data = img->data;
+	for (y = 0; y < img->height; y++, data += img->width * img->pixel_size)
+		png_write_row(png, (png_byte *) data);
+
+	/* ukoncit soubor a uvolnit pomocne struktury */
+	png_write_end(png, pnginfo);
+	png_destroy_write_struct(&png, 0);
+
+	fclose(f);
+
+	return (1);
+}