FreeType2を試す-6- 絵文字を出力

#pragma once

#include<cstdio>
#include <bitset>


//! @brief PBM(1byte,テキスト)を書き込む
void pbmP1_Write(const char* const fname, const int width, const int height, const unsigned char* const p) { // PPM ASCII

  FILE* fp = fopen(fname, "wb");
  fprintf(fp, "P1\n%d\n%d\n", width, height);

  size_t k = 0;
  for (size_t i = 0; i < (size_t)height; i++) {
    for (size_t j = 0; j < (size_t)width; j++) {
      fprintf(fp, "%d ", p[k] ? 0 : 1);
      k++;
    }
    fprintf(fp, "\n");
  }

  fclose(fp);
}

//! @brief PGM(1byte,テキスト)を書き込む
void pgmP2_Write(
  const char* const fname,
  const int width,
  const int height,
  const unsigned char* const p
) { // PPM ASCII

  FILE* fp = fopen(fname, "wb");
  fprintf(fp, "P2\n%d %d\n255\n", width, height);

  size_t k = 0;
  for (size_t i = 0; i < (size_t)height; i++) {
    for (size_t j = 0; j < (size_t)width; j++) {
      fprintf(fp, "%d ", p[k]);
      k++;
    }
    fprintf(fp, "\n");
  }

  fclose(fp);
}


//! @brief PPM(1byte,テキスト)を書き込む
void ppmP3_Write(
  const char* const fname,
  const int width,
  const int height,
  const unsigned char* const p
) {

  FILE* fp = fopen(fname, "wb");
  fprintf(fp, "P3\n%d %d\n255\n", width, height);

  size_t k = 0;
  for (size_t i = 0; i < (size_t)height; i++) {
    for (size_t j = 0; j < (size_t)width; j++) {
      //RGBAなので、* 3でなく* 4にしている
      fprintf(fp, "%d %d %d ", p[k * 4 + 2], p[k * 4 + 1], p[k * 4 + 0]);
      k++;
    }
    fprintf(fp, "\n");
  }

  fclose(fp);
}

#include <ft2build.h>
#include FT_FREETYPE_H

// MONO変換用
#include FT_BITMAP_H

#pragma warning(disable:4996)

#pragma comment(lib,"freetype.lib")


#include "pnmwrite.hpp"


int main()
{

  FT_Library  library; // handle to library
  FT_Error error;

  error = FT_Init_FreeType(&library);
  if (error)
    return -1;

  FT_Face face;

  // フォントファイル読み込み
  error = FT_New_Face(
    library,
    "C:\\Windows\\Fonts\\seguiemj.ttf", // 絵文字が使えるフォントを指定
    0,
    &face
  );

  //文字コード指定
  error = FT_Select_Charmap(
    face,               // target face object
    FT_ENCODING_UNICODE // エンコード指定
  );


  if (error == FT_Err_Unknown_File_Format)
    return -1;
  else if (error)
    return -1;

  //この二つの値でフォントサイズ調整
  FT_F26Dot6 fontsize = 16 * 64 * 2;
  FT_UInt CHAR_RESOLUTION = 300;
  error = FT_Set_Char_Size(
    face,                // handle to face object
    0,                   // char_width in 1/64th of points
    fontsize,            // char_height in 1/64th of points
    CHAR_RESOLUTION,     // horizontal device resolution
    CHAR_RESOLUTION);    // vertical device resolution

    // 文字の取得
  FT_ULong character = U'😀'; // UTF32で文字を指定

  FT_UInt char_index = FT_Get_Char_Index(face, character);

  //モノクロ
  error = FT_Load_Glyph(face, char_index, FT_LOAD_RENDER | FT_LOAD_MONOCHROME);

  //グレイスケール
  //error = FT_Load_Glyph(face, char_index, FT_LOAD_RENDER );

  //カラー
  //error = FT_Load_Glyph(face, char_index, FT_LOAD_RENDER | FT_LOAD_COLOR);

  if (error)
    return -1; // ignore errors


  int Width = face->glyph->bitmap.width;
  int Height = face->glyph->bitmap.rows;



  switch (face->glyph->bitmap.pixel_mode) {
  case FT_PIXEL_MODE_NONE:
    printf("FT_PIXEL_MODE_NONE");
    break;

  case FT_PIXEL_MODE_MONO:
    printf("FT_PIXEL_MODE_MONO");
    {
      FT_Bitmap glyphbitmap;
      FT_Bitmap_Init(&glyphbitmap);
      FT_Bitmap_Convert(library, &face->glyph->bitmap, &glyphbitmap, 1);

      FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO);
      pbmP1_Write(
        "C:\\test\\freetypetest.pbm",
        Width,
        Height,
        glyphbitmap.buffer
      );
    }

    break;

  case FT_PIXEL_MODE_GRAY:
    printf("FT_PIXEL_MODE_GRAY");

    pgmP2_Write(
      "C:\\test\\freetypetest.pgm",
      Width,
      Height,
      face->glyph->bitmap.buffer
    );

    break;

  case FT_PIXEL_MODE_GRAY2:
    printf("FT_PIXEL_MODE_GRAY2");
    break;
  case FT_PIXEL_MODE_GRAY4:
    printf("FT_PIXEL_MODE_GRAY4");
    break;
  case FT_PIXEL_MODE_LCD:
    printf("FT_PIXEL_MODE_LCD");
    break;
  case FT_PIXEL_MODE_LCD_V:
    printf("FT_PIXEL_MODE_LCD_V");
    break;

  case FT_PIXEL_MODE_BGRA:
    printf("FT_PIXEL_MODE_BGRA");

    ppmP3_Write(
      "C:\\test\\freetypetest.ppm",
      Width,
      Height,
      face->glyph->bitmap.buffer
    );

    break;

  }


  // FreeType2の解放
  FT_Done_Face(face);
  FT_Done_FreeType(library);
}