#include "Image_Exporter.h"


int saveToPNG(RS_IMAGE *img, char *tex_name) {
	char tex_path[64];
	FILE *_png_f = NULL;
	png_structp png_ptr = NULL;
	png_infop info_ptr = NULL;
	//size_t x,y;
	png_byte **row_ptrs = NULL;
	//int pixel_size = 3;
	//int depth = 8;

	strcpy(tex_path,tex_name);
	strcat(tex_path, ".png");
	_png_f = fopen(tex_path, "wb");
	if (_png_f == NULL) return EXIT_FAILURE;
	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	if (png_ptr == NULL) {
		fclose(_png_f);
		return EXIT_FAILURE;
	}
	info_ptr = png_create_info_struct(png_ptr);
	if (info_ptr == NULL) {
		fclose(_png_f);
		return EXIT_FAILURE;
	}

	// Set image attributes
	png_set_IHDR(png_ptr, info_ptr, img->width, img->height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

	// Init PNG datas
	row_ptrs = png_malloc(png_ptr, img->height * sizeof(png_byte));
	/*for (y=0; y<img->height; y++) {
		png_byte *row = png_malloc(png_ptr, img->width*sizeof(unsigned char)*3);
		row_ptrs[y] = row;
		for (x=0; x<img->width; x++) {
			unsigned char pixel[3] = pixelAt(img->pixels);
		}
	}*/
	memcpy(row_ptrs, img->pixels, sizeof(unsigned char)*3*img->height*img->width);

	png_init_io(png_ptr, _png_f);
	png_set_rows(png_ptr, info_ptr, row_ptrs);
	png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);

	png_free(png_ptr, row_ptrs);
	png_destroy_write_struct(&png_ptr, &info_ptr);
	fclose(_png_f);

	return EXIT_SUCCESS;
}