#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <png.h>
int from_png_ (char *path,png_byte IN[10000*10000*2],int *NBPP,int *PNGX, int *PNGY) {
	int i, j;
//	char sig_buf [SIG_CHECK_SIZE];
	png_info *info_ptr;
	png_struct *png_ptr;
	//png_byte **bitmap;
	//png_uint_32 *w,*h;
	png_uint_32 width, height;
	int bit_depth, color_type, interlace_type,rowbytes;
	unsigned char **row_pointers;
	char *path_tmp;

	
		path_tmp=strtok(path,"\\");
	//	path_tmp=strcat(path_tmp,"png");
	printf("reading %s:::\n",path);
	FILE *fp;
	if ((fp = fopen(path, "rb")) == NULL) {
		printf("Can't open file %s!!!\n",path_tmp);
		*NBPP=-1;
		return 0;
	}

	png_ptr = png_create_read_struct
       (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if(png_ptr == NULL) {
		printf("Error creating read_struct\n");
		fclose(fp);
		return 0;
	}
	

   info_ptr = png_create_info_struct(png_ptr);
   	if (info_ptr == NULL) {
		fclose(fp);
		png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
		return 0;
	}
	
	if (setjmp(png_ptr->jmpbuf)) {
		png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
		fclose(fp);
		printf("Error reading file\n");
		return 0;
	}
	png_init_io(png_ptr, fp);

	png_read_info(png_ptr, info_ptr);

	png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
		&interlace_type, NULL, NULL);

	*NBPP=bit_depth;
	
	*PNGX=(int)(width);
	*PNGY=(int)(height);
	printf("Image size %d %d %d %d %d %d\n",*PNGX, *PNGY, *NBPP,width, height, bit_depth);
//	sleep(10);
	rowbytes=png_get_rowbytes(png_ptr, info_ptr);
	row_pointers = (unsigned char**)malloc(height * sizeof(unsigned char*));

	for(i=0;i<(int)height;i++) {
		row_pointers[i] = &IN[rowbytes*i];
	}

	png_read_image(png_ptr, row_pointers);

	png_read_end(png_ptr, NULL); 

	png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);

	fclose(fp);
	free(row_pointers);
}