cammy/include/cammy/image.h

#ifndef _CAMMY_IMAGE_H
#define _CAMMY_IMAGE_H

#include <sys/types.h>

#include <cammy/tile.h>

#define CAMMY_IMAGE_Y_COEFFICIENT_R 0.2126
#define CAMMY_IMAGE_Y_COEFFICIENT_G 0.7152
#define CAMMY_IMAGE_Y_COEFFICIENT_B 0.0722

#define CAMMY_IMAGE_CHUNK_SIZE 4096

typedef enum {
    CAMMY_IMAGE_NONE,
    CAMMY_IMAGE_TILE,
    CAMMY_IMAGE_RGB,
    CAMMY_IMAGE_RGBA
} cammy_image_format;

typedef struct _cammy_image {
    cammy_image_format format;

    size_t width,
           height;

    union {
           uint8_t *buf;
        cammy_tile *tile;
    };
} cammy_image;

cammy_image *cammy_image_open_tile(const char *filename,
                                   size_t width,
                                   size_t height);

void cammy_image_close(cammy_image *image);

int cammy_image_save(cammy_image *image, const char *filename);

void cammy_image_dither(uint8_t *dest,
                        uint8_t *src,
                        size_t width,
                        size_t height,
                        int depth,
                        cammy_tile_palette *palette);

void cammy_image_dither_to_tile(cammy_tile *dest,
                                uint8_t *src,
                                size_t width,
                                size_t height,
                                int depth);

void cammy_image_split_to_tiles(cammy_tile *destr,
                                cammy_tile *destg,
                                cammy_tile *destb,
                                uint8_t *src,
                                size_t width,
                                size_t height,
                                int depth);

void cammy_image_copy_from_tile(uint8_t *dest,
                                cammy_tile *src,
                                size_t width,
                                size_t height,
                                int depth,
                                cammy_tile_palette *palette);

void cammy_image_merge_tiles(uint8_t *dest,
                             cammy_tile *srcr,
                             cammy_tile *srcg,
                             cammy_tile *srcb,
                             size_t width,
                             size_t height,
                             int depth);

void cammy_image_tile_copy(cammy_tile *dest,
                           cammy_tile *src,
                           size_t x_dest,
                           size_t y_dest,
                           size_t x_src,
                           size_t y_src,
                           size_t width,
                           size_t height);

#endif /* _CAMMY_IMAGE_H */