reflow_layout_internal.h

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#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_err.h"
#include "reflow.h"
#include "reflow_internal.h"
#include "stb_truetype.h"
 
/* ===========================================================================
 * Internal sizing constants (no magic numbers).
 * ===========================================================================
 */

typedef enum : uint16_t {
  k_priv_min_word_w_px        = 1U,  
  k_priv_hr_thickness_px      = 2U,  
  k_priv_image_placeholder_px = 32U, 
  k_priv_min_chapter_pages    = 1U,  
  k_priv_cell_pad_px          = 6U,  
  k_priv_row_gap_px           = 4U,  
} priv_layout_consts_t;
 
/* ===========================================================================
 * Layout cursor
 * ===========================================================================
 */

typedef struct {
  int32_t  x;                
  int32_t  y;                
  int32_t  line_top;         
  uint16_t line_height_px;   
  uint16_t active_font_px;   
  uint8_t  active_style;     
  uint16_t indent_px;        
  uint32_t page_first_glyph; 
  uint32_t page_first_image; 
  uint32_t line_first_glyph; 
  uint8_t  line_has_content; 
  uint8_t  align;            
  uint8_t  reserved8[2];     
} priv_cursor_t;
 
/* ===========================================================================
 * Cross-TU layout helpers (defined in reflow_layout.c unless noted).
 * ===========================================================================
 */

RA8_PRIV void priv_reflow_layout_byte_zero(uint8_t* dst, size_t n);

RA8_PRIV ra8_err_t priv_reflow_layout_init_font(const reflow_t* engine, stbtt_fontinfo* out_font);

RA8_PRIV uint16_t priv_reflow_layout_line_height(uint16_t font_px);

RA8_PRIV int32_t priv_reflow_layout_glyph_advance(const stbtt_fontinfo* font,
                                                  uint16_t              font_px,
                                                  int32_t               cp);

RA8_PRIV bool priv_reflow_layout_push_glyph(reflow_t* engine,
                                            int32_t   x,
                                            int32_t   y,
                                            int32_t   cp,
                                            uint16_t  font_px,
                                            uint8_t   style,
                                            uint32_t  color,
                                            uint8_t   link_id);

RA8_PRIV bool priv_reflow_layout_finish_page(reflow_t* engine, priv_cursor_t* cur);

RA8_PRIV bool priv_reflow_layout_newline(reflow_t* engine, priv_cursor_t* cur, bool allow_justify);

RA8_PRIV ra8_err_t priv_reflow_layout_apply_token(reflow_t*             engine,
                                                  priv_cursor_t*        cur,
                                                  const stbtt_fontinfo* font,
                                                  const reflow_token_t* tok);

RA8_PRIV void priv_reflow_layout_build_link_rects(reflow_t* engine, const stbtt_fontinfo* font);

RA8_PRIV bool
priv_reflow_layout_apply_image(reflow_t* engine, priv_cursor_t* cur, const reflow_token_t* tok);

RA8_PRIV ra8_err_t priv_reflow_layout_table(reflow_t*             engine,
                                            priv_cursor_t*        cur,
                                            const stbtt_fontinfo* font,
                                            uint32_t              start,
                                            uint32_t*             out_next);