zoom_tiles.h

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#pragma once
 
#include <stdint.h>
 
#include "ra8_err.h"
#include "ra8_tile_cache.h"
#include "zoom.h"

typedef struct {
  ra8_tile_cache_t* cache;     
  uint32_t          image_id;  
  uint32_t          width;     
  uint32_t          height;    
  uint16_t          tile_w;    
  uint16_t          tile_h;    
  uint16_t          tile_cols; 
  uint16_t          tile_rows; 
} zoom_tile_src_t;

[[nodiscard]] ra8_err_t zoom_tile_src_init(zoom_tile_src_t*  ts,
                                           ra8_tile_cache_t* cache,
                                           uint32_t          image_id,
                                           uint32_t          width,
                                           uint32_t          height,
                                           uint16_t          tile_w,
                                           uint16_t          tile_h);

[[nodiscard]] ra8_err_t zoom_tile_src_bind(zoom_tile_src_t* ts, zoom_source_t* out);

[[nodiscard]] ra8_err_t zoom_tile_read(void*    ctx,
                                       uint32_t x,
                                       uint32_t y,
                                       uint32_t w,
                                       uint32_t h,
                                       uint8_t* out,
                                       uint32_t out_stride);

[[nodiscard]] ra8_err_t zoom_tiles_prefetch(zoom_tile_src_t*   ts,
                                            const zoom_view_t* v,
                                            zoom_pan_t         dir,
                                            uint16_t           max_tiles,
                                            uint16_t*          out_warmed);