liujunchi
/
osmd-extended


			
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							<!--This file executes some benchmarks with HTML Canvas and VexFlow rendering-->
<!doctype html><html><head><script defer="defer">(function(){//---------------->
//----------------------------------------------------------------------------->

// TODO
// * More complex VexFlow systems

// Init function
window.onload = function () {
  window.setTimeout(start, 0);
}

var start = function () {
  document.title = "HTML Canvas Performance Tests";
  document.write("<h1>[OSMD] HTML Canvas Performance Tests</h1>");
  var t = timer();
  // Run the tests
  repeat(
    "Canvas creation", 100,
    "create an empty huge 1920 x (1080*30) canvas.",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080 * 30;
    }
  );
  repeat(
    "Fill canvas with white", 10,
    "create a huge canvas and fill it completely with white.",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080 * 30;
      var ctx = canvas.getContext("2d");
      ctx.fillRect(0, 0, canvas.width, canvas.height);
    }
  );
  repeat(
    "[VexFlow] Draw systems", 100,
    "Draw 20 empty staves on a normal (1920x200) canvas (one instrument).",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 200;
      var renderer = new Vex.Flow.Renderer(canvas, Vex.Flow.Renderer.Backends.CANVAS);
      var ctx = renderer.getContext();
      for (var j=0; j < 20; j++)
        (new Vex.Flow.Stave(
          Math.floor(Math.random()*canvas.width),
          Math.floor(Math.random()*canvas.height),
          Math.floor(Math.random()*canvas.width)
        )).addClef("treble")
          .setContext(ctx)
          .draw();
    }
  );
  repeat(
    "[VexFlow] Draw systems", 100,
    "Draw 20 empty staves on a big (1920x1080) canvas (one instrument).",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080;
      var renderer = new Vex.Flow.Renderer(canvas, Vex.Flow.Renderer.Backends.CANVAS);
      var ctx = renderer.getContext();
      for (var j=0; j < 20; j++)
        (new Vex.Flow.Stave(
          Math.floor(Math.random()*canvas.width),
          Math.floor(Math.random()*canvas.height),
          Math.floor(Math.random()*canvas.width)
        )).addClef("treble")
          .setContext(ctx)
          .draw();
    }
  );
  repeat(
    "[VexFlow] Draw systems", 50,
    "Draw 20 empty staves on a huge canvas (one instrument).",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080 * 30;
      var renderer = new Vex.Flow.Renderer(canvas, Vex.Flow.Renderer.Backends.CANVAS);
      var ctx = renderer.getContext();
      for (var j=0; j < 20; j++)
        (new Vex.Flow.Stave(
          Math.floor(Math.random()*canvas.width),
          Math.floor(Math.random()*canvas.height),
          Math.floor(Math.random()*canvas.width)
        )).addClef("treble")
          .setContext(ctx)
          .draw();
    }
  );
  repeat(
    "[VexFlow] Format & draw complex system", 50,
    "Draw 20 staves with one voice, ties and beams on a big canvas.",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080;
      var renderer = new Vex.Flow.Renderer(canvas, Vex.Flow.Renderer.Backends.CANVAS);
      var ctx = renderer.getContext();
      for (var j=0; j < 20; j++) {
        var stave = new Vex.Flow.Stave(10, 0, 500);

        // From the VexFlow Tutorial:
        stave.addClef("treble");
        stave.setContext(ctx).draw();

        var notes = [
          new Vex.Flow.StaveNote({ keys: ["e##/5"], duration: "8d" }).
            addAccidental(0, new Vex.Flow.Accidental("##")).addDotToAll(),
          new Vex.Flow.StaveNote({ keys: ["b/4"], duration: "16" }).
            addAccidental(0, new Vex.Flow.Accidental("b"))
        ];

        var notes2 = [
          new Vex.Flow.StaveNote({ keys: ["b/4"], duration: "8" }),
          new Vex.Flow.StaveNote({ keys: ["d/4"], duration: "16" }),
          new Vex.Flow.StaveNote({ keys: ["c/4", "e/4"], duration: "16" }).
            addAccidental(0, new Vex.Flow.Accidental("b"))
        ];

        var notes3 = [
          new Vex.Flow.StaveNote({ keys: ["c/4", "e/4"], duration: "8" }),
          new Vex.Flow.StaveNote({ keys: ["e/4"], duration: "8" }).
            addAccidental(0, new Vex.Flow.Accidental("#"))
        ];

        var notes4 = [
          new Vex.Flow.StaveNote({ keys: ["d/4"], duration: "8" }),
          new Vex.Flow.StaveNote({ keys: ["e/4"], duration: "8" }),
        ];

        // Create the beams
        var beam = new Vex.Flow.Beam(notes);
        var beam2 = new Vex.Flow.Beam(notes2);
        var beam3 = new Vex.Flow.Beam(notes3);
        var beam4 = new Vex.Flow.Beam(notes4);

        // Create a tie between the last note of the first group and the
        // first note of the last group.
        var tie = new Vex.Flow.StaveTie({
          first_note: notes[1],
          last_note: notes2[0],
          first_indices: [0],
          last_indices: [0]
        });

        // Create another tie between the two chords in the tune
        var tie2 = new Vex.Flow.StaveTie({
          first_note: notes2[2],
          last_note: notes3[0],
          first_indices: [0, 1],
          last_indices: [0, 1]
        });

        var all_notes = notes.concat(notes2).concat(notes3).concat(notes4);

        // Helper function to justify and draw a 4/4 voice
        Vex.Flow.Formatter.FormatAndDraw(ctx, stave, all_notes);

        // Render beams
        beam.setContext(ctx).draw();
        beam2.setContext(ctx).draw();
        beam3.setContext(ctx).draw();
        beam4.setContext(ctx).draw();

        // Render ties
        tie.setContext(ctx).draw();
        tie2.setContext(ctx).draw();
      }
    }
  );
  repeat(
    "[VexFlow|big] Format & draw 20 staves 5 voices each.", 50,
    "...",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080;
      var renderer = new Vex.Flow.Renderer(canvas, Vex.Flow.Renderer.Backends.CANVAS);
      var ctx = renderer.getContext();
      for (var j=0; j < 20; j++) {
        var stave = new Vex.Flow.Stave(
          Math.floor(Math.random()*canvas.width),
          Math.floor(Math.random()*canvas.height),
          Math.floor(Math.random()*canvas.width)
        );
        stave.addClef("treble");
        stave.setContext(ctx).draw();
        var voices = [];
        for (var i = 0, voice; i < 5; i++) {
          voice = new Vex.Flow.Voice({
            num_beats: 4,
            beat_value: 4,
            resolution: Vex.Flow.RESOLUTION
          });
          voice.addTickables(randomNotes());
          voices.push(voice);
        }
        var formatter = new Vex.Flow.Formatter().
        joinVoices(voices).format(voices, 500);
        for (var i = 0; i < 5; i++) {
          voices[i].draw(ctx, stave);
        }
      }
    }
  );
  repeat(
    "[VexFlow|huge] Format & draw 20 staves with 5 voices each.", 50,
    "...",
    function(){
      var canvas = document.createElement("canvas");
      canvas.width = 1920;
      canvas.height = 1080 * 30;
      var renderer = new Vex.Flow.Renderer(canvas, Vex.Flow.Renderer.Backends.CANVAS);
      var ctx = renderer.getContext();
      for (var j=0; j < 20; j++) {
        var stave = new Vex.Flow.Stave(
          Math.floor(Math.random()*canvas.width),
          Math.floor(Math.random()*canvas.height),
          Math.floor(Math.random()*canvas.width)
        );
        stave.addClef("treble");
        stave.setContext(ctx).draw();
        var voices = [];
        for (var i = 0, voice; i < 5; i++) {
          voice = new Vex.Flow.Voice({
            num_beats: 4,
            beat_value: 4,
            resolution: Vex.Flow.RESOLUTION
          });
          voice.addTickables(randomNotes());
          voices.push(voice);
        }
        var formatter = new Vex.Flow.Formatter().
        joinVoices(voices).format(voices, 500);
        for (var i = 0; i < 5; i++) {
          voices[i].draw(ctx, stave);
        }
      }
    }
  );

  var tmp_canvas = document.createElement("canvas");
  tmp_canvas.width = 1920;
  tmp_canvas.height = 1080;
  var tmp_renderer = new Vex.Flow.Renderer(tmp_canvas, Vex.Flow.Renderer.Backends.CANVAS);
  var ctx = tmp_renderer.getContext();
  repeat(
    "[VexFlow|big] Format & draw system", 50,
    "Draw a measure with a voice.",
    function(){
      var stave = new Vex.Flow.Stave(
        Math.floor(Math.random()*tmp_canvas.width),
        Math.floor(Math.random()*tmp_canvas.height),
        Math.floor(Math.random()*tmp_canvas.width)
      );

      // From the VexFlow Tutorial:
      stave.addClef("treble");
      stave.setContext(ctx).draw();

      var notes = [
        new Vex.Flow.StaveNote({ keys: ["e##/5"], duration: "8d" }).
        addAccidental(0, new Vex.Flow.Accidental("##")).addDotToAll(),
        new Vex.Flow.StaveNote({ keys: ["b/4"], duration: "16" }).
        addAccidental(0, new Vex.Flow.Accidental("b"))
      ];

      var notes2 = [
        new Vex.Flow.StaveNote({ keys: ["b/4"], duration: "8" }),
        new Vex.Flow.StaveNote({ keys: ["d/4"], duration: "16" }),
        new Vex.Flow.StaveNote({ keys: ["c/4", "e/4"], duration: "16" }).
        addAccidental(0, new Vex.Flow.Accidental("b"))
      ];

      var notes3 = [
        new Vex.Flow.StaveNote({ keys: ["c/4", "e/4"], duration: "8" }),
        new Vex.Flow.StaveNote({ keys: ["e/4"], duration: "8" }).
        addAccidental(0, new Vex.Flow.Accidental("#"))
      ];

      var notes4 = [
        new Vex.Flow.StaveNote({ keys: ["d/4"], duration: "8" }),
        new Vex.Flow.StaveNote({ keys: ["e/4"], duration: "8" }),
      ];

      // Create the beams
      var beam = new Vex.Flow.Beam(notes);
      var beam2 = new Vex.Flow.Beam(notes2);
      var beam3 = new Vex.Flow.Beam(notes3);
      var beam4 = new Vex.Flow.Beam(notes4);

      // Create a tie between the last note of the first group and the
      // first note of the last group.
      var tie = new Vex.Flow.StaveTie({
        first_note: notes[1],
        last_note: notes2[0],
        first_indices: [0],
        last_indices: [0]
      });

      // Create another tie between the two chords in the tune
      var tie2 = new Vex.Flow.StaveTie({
        first_note: notes2[2],
        last_note: notes3[0],
        first_indices: [0, 1],
        last_indices: [0, 1]
      });

      var all_notes = notes.concat(notes2).concat(notes3).concat(notes4);

      // Helper function to justify and draw a 4/4 voice
      Vex.Flow.Formatter.FormatAndDraw(ctx, stave, all_notes);

      // Render beams
      beam.setContext(ctx).draw();
      beam2.setContext(ctx).draw();
      beam3.setContext(ctx).draw();
      beam4.setContext(ctx).draw();

      // Render ties
      tie.setContext(ctx).draw();
      tie2.setContext(ctx).draw();
    }
  );
  finish(t);
}

//----------------------------------------------------------------------------->
// Helper functions
var randomNotes = function () {
  var notes = [];
  for (var i = 0, note, key; i < 8; i ++) {
    key = ("abcdefg".charAt(Math.floor(Math.random()*7))) + "/" + Math.floor(Math.random()*3+2);
    note = new Vex.Flow.StaveNote({ keys: [key], duration: "8" });
    notes.push(note);
  }
  return notes;
}


//----------------------------------------------------------------------------->
var finish = function (t) {
  window.setTimeout(function(){
    document.write("<hr><p><b>Total Elapsed Time: ~" + Math.floor(t()/1000) + " seconds.</b></p>");
    document.close();
  }, 0);
}


// Display the result of a test on the page
function formatResult(label, descr, times, elapsed) {
  document.write("<p><b>" + label + "</b>: " + descr + "<br>");
  document.write("<i>Elapsed time: " + (elapsed/times) + "ms each (" + times + " iterations)</i></Op>");
}

// A simple timer
var timer = function() {
    var start = new Date();
    return function() {
      return (new Date()).getTime() - start.getTime();
    }
}

// Repeat a test
var repeat0 = function(label, times, descr, func) {
  var t = timer();
  for (var i = 0; i < times; i++) func();
  formatResult(label, descr, times, t());
}
var repeat = function(label, times, descr, func) {
  window.setTimeout(function(){
    repeat0(label, times, descr, func);
  }, 0);
}

//----------------------------------------------------------------------------->
}());</script><!--------------------------------------------------------------->
<script src="../node_modules/vexflow/releases/vexflow-min.js"></script><!------>
</head></html><!--------------------------------------------------------------->