// this file is designed to be platform-agnostic
#pragma once

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

// metrics are 26.6 fixed point
struct glyph_metrics {
  int32_t width;
  int32_t height;
  int32_t horiBearingX;
  int32_t horiBearingY;
  int32_t horiAdvance;
} __attribute__ ((packed));

static_assert((sizeof (struct glyph_metrics)) == ((sizeof (int32_t)) * 5));

struct glyph_texture {
  uint16_t x;
  uint16_t y;
  uint16_t width;
  uint16_t height;
} __attribute__ ((packed));

static_assert((sizeof (struct glyph_texture)) == ((sizeof (uint16_t)) * 4));

struct glyph_bitmap {
  int32_t left;
  int32_t top;
} __attribute__ ((packed));
static_assert((sizeof (struct glyph_bitmap)) == ((sizeof (uint32_t)) * 2));

struct glyph {
  struct glyph_texture texture;
  struct glyph_metrics metrics;
  struct glyph_bitmap bitmap;
} __attribute__ ((packed));

static_assert((sizeof (struct glyph)) == ((sizeof (struct glyph_texture)) + (sizeof (struct glyph_metrics)) + (sizeof (struct glyph_bitmap))));

struct font {
  uint32_t first_char_code;
  uint32_t last_char_code;
  struct face_metrics {
    int32_t height; // 26.6 fixed point
    int32_t max_advance; // 26.6 fixed point
  } face_metrics;
  uint32_t glyph_count;
  uint16_t texture_width;
  uint16_t texture_height;
} __attribute__ ((packed));

static_assert((sizeof (struct font)) == ((sizeof (uint32_t)) * 6));

#ifdef __cplusplus
}
#endif