mg_reader.h

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#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stddef.h>
#include <stdint.h>
 
#include "jof.h"
#include "ra8_err.h"
#include "ra8_tile_cache.h"

typedef enum : uint16_t {
  k_mg_statusbar_h = 48U,  
  k_mg_pan_step    = 256U, 
  k_mg_edge_band   = 176U, 
  k_mg_minimap_w   = 104U, 
  k_mg_minimap_h   = 140U, 
  k_mg_minimap_pad = 14U,  
  k_mg_minimap_in  = 2U,   
} mg_layout_t;

typedef enum : uint8_t {
  k_mg_zoom_full = 0U, 
  k_mg_zoom_fit  = 1U, 
} mg_zoom_t;

typedef enum : uint8_t {
  k_mg_zone_none      = 0U, 
  k_mg_zone_pan_up    = 1U, 
  k_mg_zone_pan_down  = 2U, 
  k_mg_zone_pan_left  = 3U, 
  k_mg_zone_pan_right = 4U, 
  k_mg_zone_zoom      = 5U, 
} mg_zone_t;

typedef struct {
  const jof_info_t* info;        
  jof_pread_fn      pread;       
  void*             pread_ctx;   
  uint8_t*          scratch;     
  uint32_t          scratch_cap; 
} mg_tile_src_t;

typedef struct {
  uint16_t*         fb;       
  int32_t           fb_w;     
  int32_t           fb_h;     
  ra8_tile_cache_t* cache;    
  const jof_info_t* info;     
  uint32_t          image_id; 
} mg_reader_cfg_t;

typedef struct {
  uint16_t*          fb;         
  int32_t            fb_w;       
  int32_t            fb_h;       
  ra8_tile_cache_t*  cache;      
  uint32_t           image_id;   
  uint16_t           page_w;     
  uint16_t           page_h;     
  uint16_t           tile_w;     
  uint16_t           tile_h;     
  uint16_t           tile_cols;  
  uint16_t           tile_rows;  
  int32_t            view_x;     
  int32_t            view_y;     
  uint8_t            zoom;       
  uint8_t            fit_factor; 
  ra8_tile_pan_dir_t last_pan;   
} mg_reader_t;

[[nodiscard]] ra8_err_t mg_reader_init(mg_reader_t* r, const mg_reader_cfg_t* cfg);

[[nodiscard]] mg_zone_t mg_zone_hit(const mg_reader_t* r, int32_t x, int32_t y);

[[nodiscard]] bool mg_reader_tap(mg_reader_t* r, int32_t x, int32_t y);

[[nodiscard]] bool mg_reader_toggle_zoom(mg_reader_t* r);

[[nodiscard]] ra8_err_t mg_reader_render(mg_reader_t* r);

[[nodiscard]] ra8_err_t mg_reader_prefetch(mg_reader_t* r);

[[nodiscard]] ra8_err_t mg_reader_status(const mg_reader_t* r, char* buf, uint32_t cap);

[[nodiscard]] uint32_t mg_fnv1a(const void* buf, uint32_t len);

[[nodiscard]] ra8_err_t mg_tile_decode(void*                 ctx,
                                       const ra8_tile_key_t* key,
                                       uint8_t*              cell,
                                       uint32_t              cell_bytes,
                                       uint16_t*             out_w,
                                       uint16_t*             out_h);
 
#ifdef __cplusplus
}
#endif