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<!-- Copyright (c) 2021, Konstantin Aladyshev <aladyshev22@gmail.com> -->

<!-- SPDX-License-Identifier: MIT -->

<html>
  <head>
    <style>
      @font-face {
        font-family: "AST";
        src: url(web_ast_premiumexec.woff) format('woff');
      }
    </style>
  </head>
  <body>
    <canvas id="canvas" width="32" height="32"></canvas>
    <script type="text/javascript">
      function decimalToHex(d, padding) {
        var hex = Number(d).toString(16);
        padding = typeof (padding) === "undefined" || padding === null ? padding = 2 : padding;

        while (hex.length < padding) {
          hex = "0" + hex;
        }

        return hex;
      }

      function UnicodeToGlyphs(unicode_start_code, unicode_end_code) {
        const threshold = 100;                // `A` threshold to count data as a black pixel
        const FW = 16;
        const FH = 19;
        const left_glyph_start_column = 0;
        const left_glyph_end_column = FW/2 - 1;
        const right_glyph_start_column = FW/2;
        const right_glyph_end_column = FW - 1;

        const canvas = document.getElementById('canvas');
        canvas.width *= window.devicePixelRatio
        canvas.height *= window.devicePixelRatio
        canvas.style.width = 32
        canvas.style.height = 32
        const ctx = canvas.getContext('2d');
        ctx.strokeRect(0, 0, FW, FH);
        ctx.font = "19px AST"
        ctx.fillstyle='#00f';

        var wide_glyphs_str="EFI_WIDE_GLYPH  gSimpleFontWideGlyphData[] = {<BR>";
        var narrow_glyphs_str="EFI_NARROW_GLYPH  gSimpleFontNarrowGlyphData[] = {<BR>";
        for(i=unicode_start_code; i<=unicode_end_code; i++){
          wide_glyph = false;
          ctx.clearRect(0, 0, FW, FH);
          ctx.fillText(String.fromCharCode(i), 0, 0 + FW-1);
          var bitmapimg = ctx.getImageData(0, 0, FW, FH);
          var bitmap = bitmapimg.data;
          var left_glyph = " ";
          var right_glyph = " ";
          for (row=0; row<FH; row++){
            left_row = 0;
            for (col=left_glyph_start_column; col<=left_glyph_end_column; col++){
              left_row <<= 1
              if (bitmap[row*FW*4 + col*4 + 3] > threshold)
                left_row |= 1;
            }
            left_glyph += "0x" + decimalToHex(left_row);

            right_row = 0;
            for (col=right_glyph_start_column; col<=right_glyph_end_column; col++){
              right_row <<= 1
              if(bitmap[row*FW*4 + col*4 + 3] > threshold) {
                wide_glyph = true;
                right_row |= 1;
              }
            }
            right_glyph += "0x" + decimalToHex(right_row);

            if (row < (FH-1)) {
              left_glyph += ",";
              right_glyph += ",";
            }
          }
          if (wide_glyph)
            wide_glyphs_str += "{ 0x" + decimalToHex(i) + ", 0x00, " + "{" +  left_glyph + "}, {" + right_glyph + "}, {0x00,0x00,0x00}}," + "<BR>";
          else
            narrow_glyphs_str += "{ 0x" + decimalToHex(i) + ", 0x00, " + "{" +  left_glyph + "}},"+ "<BR>";
        }
        narrow_glyphs_str += "};<BR>"
        narrow_glyphs_str += "UINT32 gSimpleFontNarrowBytes = sizeof(gSimpleFontNarrowGlyphData);<BR>"
        wide_glyphs_str += "{ 0x00, 0x00, { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}" + "<BR>"
        wide_glyphs_str += "};<BR>"
        wide_glyphs_str += "UINT32 gSimpleFontWideBytes = sizeof(gSimpleFontWideGlyphData);<BR>"
        return wide_glyphs_str + "<BR>" + narrow_glyphs_str;
      }

      const unicode_start_code = 0x0400;
      const unicode_end_code = 0x045F;
      var f = new FontFace('AST', 'url(web_ast_premiumexec.woff)');
      f.load().then(function() {
        document.write(UnicodeToGlyphs(unicode_start_code, unicode_end_code));
      })
    </script>
  </body>
</html>