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

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