/* * src/bitmap.h
 * (c) 2020 Jonas Gunz <himself@jonasgunz.de>
 * License: MIT
*/

#ifndef _BITMAP_H_
#define _BITMAP_H_

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <errno.h>

#include "dynalloc.h"

#define _HEADER_SIZE 54 //Fileheader + infoheader
#define IDENTIFIER 0x424d //BM BitMap identifier

//Address Definitions
#define BF_TYPE           0x00
#define BF_SIZE           0x02
#define BF_OFF_BITS       0x0a

#define BI_SIZE           0x0e
#define BI_WIDTH          0x12
#define BI_HEIGHT         0x16
#define BI_BIT_COUNT      0x1c
#define BI_COMPRESSION    0x1e
#define BI_SIZE_IMAGE     0x22
#define BI_CLR_USED       0x2e
#define BI_CLR_IMPORTANT  0x32

#define R(x) (0xff0000 & x) >> 16
#define G(x) (0x00ff00 & x) >> 8
#define B(x) (0x0000ff & x)

#define BITMAP_MONOCHROME 0x01

struct bitmap_file_header {
	uint8_t error;

	uint16_t bfType;
	uint32_t bfSize;
	uint32_t bfOffBits;

	uint32_t biSize;
	int32_t  biWidth;
	int32_t  biHeight;
	uint16_t biBitCount;
	uint32_t biCompression;
	uint32_t biSizeImage;
	uint32_t biClrUsed;
	uint32_t biClrImportant;

	unsigned char *tables;
	uint32_t      tablesc;
};

struct bitmap_image {
	unsigned int x,y;

	uint8_t **R;
	uint8_t **G;
	uint8_t **B;

	uint8_t tags;
	uint8_t monochrome_maximum_brightness;
	uint8_t monochrome_minimum_brightness;
};

int bitmap_read ( char *_file, struct bitmap_image *_bitmap );

int bitmap_copy ( struct bitmap_image *_input, struct bitmap_image *_output );

int bitmap_convert_monochrome ( struct bitmap_image *_input, struct bitmap_image *_output );

int bitmap_shrink ( struct bitmap_image *_input, struct bitmap_image *_output, unsigned int _factor_x, unsigned int _factor_y );

int bitmap_fit_to_width ( struct bitmap_image *_input, struct bitmap_image *_output, unsigned int _width );

char* bitmap_strerror( int _error );

#endif /* end of include guard: _BITMAP_H_ */