#ifndef RS_IMAGES_H_
#define RS_IMAGES_H_

#include <stdio.h>
#include <stdlib.h>
#if defined(_WIN32)
	#define OS 1
	#include <windows.h>
#else
	#define OS 2
	#include <sys/types.h>
	#include <sys/stat.h>
#endif


/////////////////////////////
///// 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 */
	unsigned char palette[256][3];		/**< Image palette definition */					//TODO: Create union struct type instead
}RS_IMAGE;

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


/////////////////////////////
///// Declare functions /////
/////////////////////////////
RS_IMAGE_DESC getImageDescFromType(unsigned char type);		//TODO: Optimise function
int isTransparentColor(PIXEL_A *testColor, PIXEL_A *transp_color);
void convert4bitsGreyto8bitsRGB(unsigned char *samples_tab, PIXEL_A *pixels_tab, int sampling, PIXEL_A *transp_color);
void unpack4To24bitsRGB(unsigned char *samples_tab, unsigned char *pixels_tab, int size, unsigned char pal[256][3]);
void unpack8To24bitsRGB(unsigned char *samples_tab, unsigned char *pixels_tab, int size, unsigned char pal[256][3]);
void useOddBytes(unsigned char *src, unsigned char *dst, int size);
void decodePixels(RS_IMAGE *img);
PIXEL_A *pixelAt(RS_IMAGE *img, int posX , int posY);
int getPaletteFromFile(RS_IMAGE *img, FILE *f);
int getSamplesFromFile(RS_IMAGE *img, FILE *f);

#endif