/* This code is part of RGB Image Library see URL: xxx *//**************************************************************************RGB Image Library (rgbimagelib)File: image.cCopyright (c) 2006 Radek BrichPermission is hereby granted, free of charge, to any personobtaining a copy of this software and associated documentationfiles (the "Software"), to deal in the Software withoutrestriction, including without limitation the rights to use,copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of the Software, and to permit persons to whom theSoftware is furnished to do so, subject to the followingconditions:The above copyright notice and this permission notice shall beincluded 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 WARRANTIESOF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE ANDNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHTHOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISINGFROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OROTHER 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 = (unsigned char *) malloc(width * height * pixelsize); return(0);}void 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 */ unsigned 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_info_struct(png, &pnginfo); 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_info_struct(png, &pnginfo); png_destroy_write_struct(&png, 0); fclose(f); return (1);}