#ifndef RS_IMAGES_H_
#define RS_IMAGES_H_

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include "options.h"

/**
 * @brief Constant contain the number of channel inside a PIXEL definition.
 */
#define PIXEL_MEMBERS_NBR 4


/////////////////////////////
///// Define new types //////
/////////////////////////////

/**
 * @brief RGBA pixel structure, used to store datas for implementation inside PNG files.
 */
typedef struct PixelRGBA {
	unsigned char _red;
	unsigned char _green;
	unsigned char _blue;
	unsigned char _alpha;
}PIXEL_A;

/**
 * @brief RGB pixel structure, used to store datas for implementation inside PNG files, optimised version without alpha channel support.
 */
typedef struct PixelRGB {
	unsigned char _red;
	unsigned char _green;
	unsigned char _blue;
}PIXEL;

/**
 * @brief Image definition from Rogue Squadron HMT files
 */
typedef struct RSImage {
	int data_size; 						/**< Image bytes size */
	int width, height;
	unsigned char type_;				/**< Image type (0 = RBG/4bits per pixel, 1 = RBG/8bpp, 3 = RGBA/32bpp , 4 = grayscale/4bpp, 5 = grayscale/8bpp */
	unsigned char sampleBits;			/**< Bits per samble */
	int paletteEntries;
	PIXEL_A alpha_color;
	PIXEL_A *pixels;						/**< Image pixels list, managed like an array and declared as a pointer */
	unsigned char *samples;				/**< Image samples list managed like an array and declared as a pointer */
	PIXEL palette[256];		/**< Image palette definition */					//TODO: Create union struct type instead
}RS_IMAGE;

typedef struct RSImage_desc {
	int palette_entries;
	int sample_bits;
}RS_IMAGE_DESC;


/////////////////////////////
///// Declare functions /////
/////////////////////////////

/**
 * @brief Conversion table for image type using RS_IMAGE_DESC.
 * Return RS_IMAGE_DESC by providing image type as int\n
 *
 * Detailed conversion:\n\n
 * Type 0 -> Palette entries: 16 ; Sample bits: 4\n
 * Type 1 -> Palette entries: 256 ; Sample bits: 8\n
 * Type 2 -> Palette entries: 0 ; Sample bits: 16\n
 * Type 3 -> Palette entries: 0 ; Sample bits: 32\n
 * Type 4 -> Palette entries: 0 ; Sample bits: 4\n
 * Type 5 -> Palette entries: 0 ; Sample bits: 8\n
 */
RS_IMAGE_DESC getImageDescFromType(unsigned char type);		//TODO: Optimise function

int isTransparentColor(PIXEL_A *testColor, PIXEL_A *transp_color);
void convert4bitsGreyTo32bitsRGBA(unsigned char *samples_tab, PIXEL_A *pixels_tab, int sampling, PIXEL_A *transp_color);
void convert4bitsTo32bitsRGBA(unsigned char *samples_tab, PIXEL_A *pixels_tab, int size, PIXEL *pal, PIXEL_A *transp_color);
void convert8bitsTo32bitsRGBA(unsigned char *samples_tab, PIXEL_A *pixels_tab, int size, PIXEL *pal, PIXEL_A *transp_color);
void useOddBytes(unsigned char *src, PIXEL_A *dst, int size);
void decodePixels(RS_IMAGE *img);
PIXEL_A *pixelAt(RS_IMAGE *img, int posX , int posY);

#endif