jof_internal.h

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#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include "jof_produce.h"
#include "ra8_attributes.h"
#include "ra8_err.h"

typedef enum : uint8_t {
  k_jof_bump_align = 8U, 
} jof_bump_const_t;

typedef struct {
  uint8_t* base; 
  size_t   cap;  
  size_t   off;  
} jof_bump_t;

RA8_PRIV void* priv_jof_bump_take(jof_bump_t* bump, size_t len);

typedef ra8_err_t (*jof_geom_fn)(void* ctx, uint16_t width, uint16_t height, uint8_t channels);

typedef ra8_err_t (*jof_rows_fn)(void*          ctx,
                                 const uint8_t* px,
                                 uint16_t       width,
                                 uint16_t       y0,
                                 uint16_t       nrows,
                                 uint8_t        channels);

RA8_PRIV ra8_err_t priv_jof_png_rows(jof_pull_fn pull,
                                     void*       pull_ctx,
                                     jof_bump_t* bump,
                                     uint16_t    max_w,
                                     uint16_t    max_h,
                                     jof_geom_fn on_geom,
                                     jof_rows_fn on_rows,
                                     void*       cb_ctx);

typedef enum : uint32_t {
  k_jof_carve_slack = 128U, 
} jof_carve_const_t;

typedef struct {
  const uint8_t* head;      
  size_t         head_len;  
  size_t         pos;       
  jof_pull_fn    inner;     
  void*          inner_ctx; 
} jof_prefix_pull_t;

typedef struct {
  const jof_produce_cfg_t* cfg;        
  jof_bump_t               bump_store; 
  jof_bump_t*              bump;       
 
  uint16_t cap_w; 
  uint16_t cap_h; 
 
  uint16_t w;          
  uint16_t h;          
  uint8_t  bpp;        
  uint16_t tile_cols;  
  uint16_t tile_rows;  
  uint32_t tile_count; 
  uint8_t  geom_done;  
 
  uint8_t* band;    
  uint8_t* stage;   
  uint8_t* cmp;     
  uint32_t cmp_cap; 
  uint8_t* idx;     
  uint8_t* dfl;     
  uint32_t dfl_len; 
 
  uint32_t rows_seen;  
  uint32_t band_fill;  
  uint32_t tiles_done; 
  uint32_t written;    
} jof_prod_state_t;

RA8_PRIV ra8_err_t priv_jof_prefix_pull(void* ctx, uint8_t* buf, size_t cap, size_t* got);

RA8_PRIV ra8_err_t priv_jof_on_geom(void* ctx, uint16_t width, uint16_t height, uint8_t channels);

RA8_PRIV ra8_err_t priv_jof_on_rows(void*          ctx,
                                    const uint8_t* px,
                                    uint16_t       width,
                                    uint16_t       y0,
                                    uint16_t       nrows,
                                    uint8_t        channels);

RA8_PRIV ra8_err_t priv_jof_webp_transcode(jof_prod_state_t* st, jof_prefix_pull_t* pfx);