git.kianting.info Git - clo/blob - src/harfbuzz.js

   1 "use strict";
   2 Object.defineProperty(exports, "__esModule", { value: true });
   3 exports.harfbuzzTest = void 0;
   4 var hb = require('harfbuzzjs/hbjs');
   5 var fs = require('fs');
   6 // some part of code derived from that by Ebrahim Byagowi,
   7 // under MIT License
   8 function harfbuzzTest(inputString) {
   9     WebAssembly.instantiate(fs.readFileSync(__dirname + "/../3rdparty/harfbuzzjs/hb.wasm"))
  10         .then(function (wsm) {
  11         hb = hb(wsm.instance);
  12         let fontdata = fs.readFileSync("/usr/share/fonts/truetype/freefont/FreeSerif.ttf");
  13         //hbjs(fontdata.instance);
  14         //console.log(a);
  15         var blob = hb.createBlob(fontdata); // Load the font data into something Harfbuzz can use
  16         var face = hb.createFace(blob, 0); // Select the first font in the file (there's normally only one!)
  17         var font = hb.createFont(face); // Create a Harfbuzz font object from the face
  18         var buffer = hb.createBuffer(); // Make a buffer to hold some text
  19         buffer.addText(inputString); // Fill it with some stuff
  20         buffer.guessSegmentProperties(); // Set script, language and direction
  21         hb.shape(font, buffer); // Shape the text, determining glyph IDs and positions
  22         var output = buffer.json();
  23         // Enumerate the glyphs
  24         console.log("id\tax\tdx\tdy");
  25         var xCursor = 0;
  26         var yCursor = 0;
  27         for (var glyph of output) {
  28             var glyphId = glyph.g;
  29             var xAdvance = glyph.ax;
  30             var xDisplacement = glyph.dx;
  31             var yDisplacement = glyph.dy;
  32             var svgPath = font.glyphToPath(glyphId);
  33             console.log(glyphId + "\t" + xAdvance + "\t" + xDisplacement + "\t" + yDisplacement);
  34             // You need to supply this bit
  35             //drawAGlyph(svgPath, xCursor + xDisplacement, yDisplacement);
  36             // xCursor += xAdvance;
  37         }
  38         // Release memory
  39         buffer.destroy();
  40         font.destroy();
  41         face.destroy();
  42         blob.destroy();
  43     });
  44 }
  45 exports.harfbuzzTest = harfbuzzTest;