rdpq_paragraph.h

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#ifndef LIBDRAGON_RDPQ_PARAGRAPH_H
#define LIBDRAGON_RDPQ_PARAGRAPH_H
 
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct rdpq_textparms_s;
typedef struct rdpq_textparms_s rdpq_textparms_t;
 
typedef struct __attribute__((packed)) rdpq_paragraph_char_s {
    union {
        struct __attribute__((packed)) {
            uint8_t font_id   : 8;     
            uint8_t atlas_id  : 8;     
            uint8_t style_id  : 8;     
            int x             : 12;    
            int y             : 12;    
            int16_t glyph     : 16;    
        };
        uint32_t sort_key;
    };
} rdpq_paragraph_char_t;
 
_Static_assert(sizeof(rdpq_paragraph_char_t) == 8, "rdpq_paragraph_char_t is not packed");
 
enum rdpq_paragraph_flag_e {
    RDPQ_PARAGRAPH_FLAG_ANTIALIAS_FIX = (1 << 0),
 
    RDPQ_PARAGRAPH_FLAG_MALLOC = (1 << 1),
};
 
typedef struct {
    struct {
        float x0;                    
        float y0;                    
        float x1;                    
        float y1;                    
    } bbox;                          
    float advance_x;                 
    float advance_y;                 
    int nlines;                      
    int nchars;                      
    int capacity;                    
    float x0, y0;                    
    int flags;                       
    rdpq_paragraph_char_t chars[];   
} rdpq_paragraph_t;
 
rdpq_paragraph_t* rdpq_paragraph_build(const rdpq_textparms_t *parms, uint8_t initial_font_id, 
    const char *utf8_text, int *nbytes);
 
void rdpq_paragraph_render(const rdpq_paragraph_t *layout, float x0, float y0);
 
void rdpq_paragraph_free(rdpq_paragraph_t *layout);
 
void rdpq_paragraph_builder_begin(const rdpq_textparms_t *parms, uint8_t initial_font_id, rdpq_paragraph_t *layout);
 
void rdpq_paragraph_builder_font(uint8_t font_id);
 
void rdpq_paragraph_builder_style(uint8_t style_id);
 
void rdpq_paragraph_builder_span(const char *utf8_text, int nbytes);
 
void rdpq_paragraph_builder_newline(void);
 
rdpq_paragraph_t* rdpq_paragraph_builder_end(void);
 
#ifdef __cplusplus
}
#endif
 
#endif