qoi.h

#ifndef __QOI_H__
#define __QOI_H__

#include <stdint.h>

// "qoif"
#define QOI_MAGIC (('q' << 24) | ('o' << 16) | ('i' << 8) | ('f' << 0))

#define RGB        3
#define RGBA       4
#define QOI_SRGB   0
#define QOI_LINEAR 1

typedef uint8_t qoi_channels_t;
typedef uint8_t qoi_colorspace_t;

typedef struct {
	uint32_t width;
	uint32_t height;
	qoi_channels_t channels;
	qoi_colorspace_t colorspace;
} qoi_desc_t;

typedef struct {
	uint8_t magic[4];
	uint32_t width;
	uint32_t height;
	qoi_channels_t channels;
	qoi_colorspace_t colorspace;
} qoi_header_t;

#define QOI_HEADER_LENGTH 14

#define QOI_OP_RGB   0xfe // 0b1111 1110
#define QOI_OP_RGBA  0xff // 0b1111 1111
#define QOI_OP_INDEX 0x00 // 0b00
#define QOI_OP_DIFF  0x40 // 0b01
#define QOI_OP_LUMA  0x80 // 0b10
#define QOI_OP_RUN   0xc0 // 0b11

#define QOI_END_MARKER                                                                             \
	{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }
#define QOI_END_MARKER_LENGTH 8

#endif