image.h

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#ifndef IMAGE_H
#define IMAGE_H
 
#include <stddef.h>
#include <stdint.h>
 
/* -------------------------------------------------------------------------
 * Opaque pixel buffer
 * ---------------------------------------------------------------------- */

typedef struct {
    uint8_t *pixels;  
    int      width;   
    int      height;  
} Image;
 
/* -------------------------------------------------------------------------
 * Preprocessing parameters
 * ---------------------------------------------------------------------- */

typedef struct {
    float rotation_deg; 
    int   invert;       
} PreprocessParams;
 
/* -------------------------------------------------------------------------
 * Public API
 * ---------------------------------------------------------------------- */

Image *image_load_png(const char *path);

void image_free(Image *img);

void image_to_grayscale(Image *img);

void image_binarize(Image *img);

Image *image_resize(const Image *img, int w, int h);

Image *image_rotate(const Image *img, float angle_deg);

void image_to_float(const Image *img, float *out);

int image_load_normalised(const char *path, const PreprocessParams *p,
                          float *out, int out_h, int out_w);

int image_save_png(const Image *img, const char *path);
 
#endif /* IMAGE_H */