/* Structure for data supplied in halftone call back */
typedef struct ipa_halftone_data_s {
    const unsigned char *data;
    int                  offset_x;
    unsigned int         raster;
    int                  x;
    int                  y;
    unsigned int         w;
    unsigned int         h;
    unsigned int         plane_raster;
} ipa_halftone_data_t;

/* Opaque type for halftone instance */
typedef struct ipa_halftone_s ipa_halftone;

typedef struct ipa_matrix_s {
    float xx; float xy;
    float yx; float yy;
    float tx; float ty;
} ipa_matrix;

typedef void (ipa_ht_callback_t)(ipa_halftone_data_t *data, void *args);

/* Initialize a halftone instance. */
ipa_halftone *ipa_halftone_init(ipa_context       *ctx,
                                void              *opaque,
                                int                x,
                                int                y,
                                unsigned int       w,
                                unsigned int       h,
                                const ipa_matrix  *mat,
                                unsigned int       num_planes,
                                unsigned char     *cache,
                                int                clip_x,
                                int                clip_y,
                                unsigned int       clip_w,
                                unsigned int       clip_h,
                                ipa_ht_callback_t *callback,
                                void              *callback_arg);

/* Set a screen for a colorant. */
int ipa_halftone_add_screen(ipa_context *ctx, void *opaque, ipa_halftone *ht,
    int invert, unsigned short width, unsigned short height, int phase,
    unsigned char *values);

/* Halftone some data. */
int ipa_halftone_process_planar(ipa_halftone         *ht,
                                void                 *opaque,
                                const unsigned char **buffer);

int ipa_halftone_process_chunky(ipa_halftone         *ht,
                                void                 *opaque,
                                const unsigned char **buffer);

/* Finalize a halftone instance. */
void ipa_halftone_fin(ipa_halftone *, void *opaque);