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

   1 var hb = require('harfbuzzjs/hbjs');
   2 var fs = require('fs');
   3 // some part of code derived from that by Ebrahim Byagowi,
   4 // under MIT License
   5 export function harfbuzzTest(inputString: string){
   6     WebAssembly.instantiate(fs.readFileSync(__dirname+"/../3rdparty/harfbuzzjs/hb.wasm"))
   7         .then(function (wsm) {
   8
   9         hb = hb(wsm.instance);
  10
  11
  12         let fontdata = fs.readFileSync("/usr/share/fonts/truetype/freefont/FreeSerif.ttf");
  13
  14         //hbjs(fontdata.instance);
  15
  16         //console.log(a);
  17
  18             var blob = hb.createBlob(fontdata); // Load the font data into something Harfbuzz can use
  19             var face = hb.createFace(blob, 0);  // Select the first font in the file (there's normally only one!)
  20             var font = hb.createFont(face);     // Create a Harfbuzz font object from the face
  21             var buffer = hb.createBuffer();     // Make a buffer to hold some text
  22             buffer.addText(inputString);              // Fill it with some stuff
  23             buffer.guessSegmentProperties();    // Set script, language and direction
  24             hb.shape(font, buffer);             // Shape the text, determining glyph IDs and positions
  25             var output : Array<{g : number,
  26                                 ax : number,
  27                                 dx : number,
  28                                 dy : number}> = buffer.json();
  29
  30             // Enumerate the glyphs
  31             console.log("id\tax\tdx\tdy");
  32
  33             var xCursor = 0;
  34             var yCursor = 0;
  35             for (var glyph of output) {
  36                 var glyphId = glyph.g;
  37                 var xAdvance = glyph.ax;
  38                 var xDisplacement = glyph.dx;
  39                 var yDisplacement = glyph.dy;
  40
  41                 var svgPath = font.glyphToPath(glyphId);
  42
  43                 console.log(glyphId + "\t" + xAdvance + "\t" + xDisplacement + "\t" + yDisplacement);
  44
  45                 // You need to supply this bit
  46                 //drawAGlyph(svgPath, xCursor + xDisplacement, yDisplacement);
  47
  48                 // xCursor += xAdvance;
  49             }
  50
  51             // Release memory
  52             buffer.destroy();
  53             font.destroy();
  54             face.destroy();
  55             blob.destroy();
  56     });
  57 }