ra8_gfx_dither.h

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#pragma once
 
#include <stdint.h>
 
#include "ra8_err.h"

typedef enum : uint8_t {
  k_ra8_gfx_dither_levels          = 16, 
  k_ra8_gfx_dither_step            = 17, 
  k_ra8_gfx_dither_max_level       = 15, 
  k_ra8_gfx_dither_nib_shift       = 4,  
  k_ra8_gfx_dither_ppb             = 2,  
  k_ra8_gfx_dither_mask_dim        = 64, 
  k_ra8_gfx_dither_mask_index_mask = 63, 
  k_ra8_gfx_dither_rgb_g_shift     = 8,  
  k_ra8_gfx_dither_rgb_r_shift     = 16, 
} ra8_gfx_dither_const_t;

typedef enum : uint16_t {
  k_ra8_gfx_dither_byte_levels = 256,  
  k_ra8_gfx_dither_mask_len    = 4096, 
} ra8_gfx_dither_scale_t;

uint8_t ra8_gfx_dither_gray4_level(uint8_t gray8, int32_t x, int32_t y);

[[nodiscard]] ra8_err_t ra8_gfx_dither_gray8_to_gray4(const uint8_t* src,
                                                      int32_t        w,
                                                      int32_t        h,
                                                      int32_t        origin_x,
                                                      int32_t        origin_y,
                                                      uint8_t*       out,
                                                      uint32_t       out_cap,
                                                      uint32_t*      out_size);

[[nodiscard]] ra8_err_t
ra8_gfx_blit_gray8_dither(const uint8_t* src, int32_t w, int32_t h, int32_t dst_x, int32_t dst_y);