path: root/src/library_browser.js

//"use strict";

// Utilities for browser environments

mergeInto(LibraryManager.library, {
  $Browser__postset: 'Module["requestFullScreen"] = function(lockPointer, resizeCanvas) { Browser.requestFullScreen(lockPointer, resizeCanvas) };\n' + // exports
                     'Module["requestAnimationFrame"] = function(func) { Browser.requestAnimationFrame(func) };\n' +
                     'Module["pauseMainLoop"] = function() { Browser.mainLoop.pause() };\n' +
                     'Module["resumeMainLoop"] = function() { Browser.mainLoop.resume() };\n',
  $Browser: {
    mainLoop: {
      scheduler: null,
      shouldPause: false,
      paused: false,
      queue: [],
      pause: function() {
        Browser.mainLoop.shouldPause = true;
      },
      resume: function() {
        if (Browser.mainLoop.paused) {
          Browser.mainLoop.paused = false;
          Browser.mainLoop.scheduler();
        }
        Browser.mainLoop.shouldPause = false;
      },
      updateStatus: function() {
        if (Module['setStatus']) {
          var message = Module['statusMessage'] || 'Please wait...';
          var remaining = Browser.mainLoop.remainingBlockers;
          var expected = Browser.mainLoop.expectedBlockers;
          if (remaining) {
            if (remaining < expected) {
              Module['setStatus'](message + ' (' + (expected - remaining) + '/' + expected + ')');
            } else {
              Module['setStatus'](message);
            }
          } else {
            Module['setStatus']('');
          }
        }
      }
    },
    isFullScreen: false,
    pointerLock: false,
    moduleContextCreatedCallbacks: [],
    workers: [],

    init: function() {
      if (Browser.initted) return;
      Browser.initted = true;
      try {
        new Blob();
        Browser.hasBlobConstructor = true;
      } catch(e) {
        Browser.hasBlobConstructor = false;
        console.log("warning: no blob constructor, cannot create blobs with mimetypes");
      }
      Browser.BlobBuilder = typeof MozBlobBuilder != "undefined" ? MozBlobBuilder : (typeof WebKitBlobBuilder != "undefined" ? WebKitBlobBuilder : (!Browser.hasBlobConstructor ? console.log("warning: no BlobBuilder") : null));
      Browser.URLObject = typeof window != "undefined" ? (window.URL ? window.URL : window.webkitURL) : console.log("warning: cannot create object URLs");

      // Support for plugins that can process preloaded files. You can add more of these to
      // your app by creating and appending to Module.preloadPlugins.
      //
      // Each plugin is asked if it can handle a file based on the file's name. If it can,
      // it is given the file's raw data. When it is done, it calls a callback with the file's
      // (possibly modified) data. For example, a plugin might decompress a file, or it
      // might create some side data structure for use later (like an Image element, etc.).

      function getMimetype(name) {
        return {
          'jpg': 'image/jpeg',
          'jpeg': 'image/jpeg',
          'png': 'image/png',
          'bmp': 'image/bmp',
          'ogg': 'audio/ogg',
          'wav': 'audio/wav',
          'mp3': 'audio/mpeg'
        }[name.substr(name.lastIndexOf('.')+1)];
      }

      if (!Module["preloadPlugins"]) Module["preloadPlugins"] = [];

      var imagePlugin = {};
      imagePlugin['canHandle'] = function(name) {
        return !Module.noImageDecoding && /\.(jpg|jpeg|png|bmp)$/.exec(name);
      };
      imagePlugin['handle'] = function(byteArray, name, onload, onerror) {
        var b = null;
        if (Browser.hasBlobConstructor) {
          try {
            b = new Blob([byteArray], { type: getMimetype(name) });
          } catch(e) {
            Runtime.warnOnce('Blob constructor present but fails: ' + e + '; falling back to blob builder');
          }
        }
        if (!b) {
          var bb = new Browser.BlobBuilder();
          bb.append((new Uint8Array(byteArray)).buffer); // we need to pass a buffer, and must copy the array to get the right data range
          b = bb.getBlob();
        }
        var url = Browser.URLObject.createObjectURL(b);
#if ASSERTIONS
        assert(typeof url == 'string', 'createObjectURL must return a url as a string');
#endif
        var img = new Image();
        img.onload = function() {
          assert(img.complete, 'Image ' + name + ' could not be decoded');
          var canvas = document.createElement('canvas');
          canvas.width = img.width;
          canvas.height = img.height;
          var ctx = canvas.getContext('2d');
          ctx.drawImage(img, 0, 0);
          Module["preloadedImages"][name] = canvas;
          Browser.URLObject.revokeObjectURL(url);
          if (onload) onload(byteArray);
        };
        img.onerror