pixi.js

    BaseTexture.prototype.update = function update(dontemit) {
        // Svg size is handled during load
        if (this.imageType !== 'svg') {
            this.realWidth = this.source.naturalWidth || this.source.videoWidth || this.source.width;
            this.realHeight = this.source.naturalHeight || this.source.videoHeight || this.source.height;

            this._updateDimensions();
        }

        if (!dontemit) this.emit('update', this);
    };

    BaseTexture.prototype.loadSource = function loadSource(source) {
        var wasLoading = this.isLoading;

        this.hasLoaded = false;
        this.isLoading = false;

        if (wasLoading && this.source) {
            this.source.onload = null;
            this.source.onerror = null;
        }

        var firstSourceLoaded = !this.source;

        this.source = source;

        // Apply source if loaded. Otherwise setup appropriate loading monitors.
        if ((source.src && source.complete || source.getContext) && source.width && source.height) {
            this._updateImageType();

            if (this.imageType === 'svg') {
                this._loadSvgSource();
            } else {
                
            }

            var scope = this;

            if (firstSourceLoaded) {
                // send loaded event if previous source was null and we have been passed a pre-loaded IMG element
                if (window.createImageBitmap) {
                    scope.hasLoaded = true;
                    scope.update(true);
                  
                    window.createImageBitmap(source).then(function(imageBitmap) {
                        scope.source = imageBitmap;
                        scope.emit('loaded', scope);
                    })
                } else {
                    this._sourceLoaded();
                    scope.emit('loaded', scope);
                }
            }
        } else if (!source.getContext) {
            // Image fail / not ready
            this.isLoading = true;

            var scope = this;

            source.onload = function () {
                scope._updateImageType();
                source.onload = null;
                source.onerror = null;

                if (!scope.isLoading) {
                    return;
                }

                scope.isLoading = false;
                
                if (scope.imageType === 'svg') {
                    scope._loadSvgSource();

                    return;
                }

                if (window.createImageBitmap) {
                    scope.hasLoaded = true;
                    scope.update(true);

                    window.createImageBitmap(source).then(function(imageBitmap) {
                        scope.source = imageBitmap;
                        scope.emit('loaded', scope);
                    })
                } else {
                    scope._sourceLoaded();
                    scope.emit('loaded', scope);
                }
            };

            source.onerror = function () {
                source.onload = null;
                source.onerror = null;

                if (!scope.isLoading) {
                    return;
                }

                scope.isLoading = false;
                scope.emit('error', scope);
            };

            // Per http://www.w3.org/TR/html5/embedded-content-0.html#the-img-element
            //   "The value of `complete` can thus change while a script is executing."
            // So complete needs to be re-checked after the callbacks have been added..
            // NOTE: complete will be true if the image has no src so best to check if the src is set.
            if (source.complete && source.src) {
                // ..and if we're complete now, no need for callbacks
                source.onload = null;
                source.onerror = null;

                if (scope.imageType === 'svg') {
                    scope._loadSvgSource();

                    return;
                }

                this.isLoading = false;

                if (source.width && source.height) {

                    // If any previous subscribers possible
                    if (wasLoading) {

                        if (window.createImageBitmap) {
                            scope.hasLoaded = true;
                            scope.update(true);
                          
                            window.createImageBitmap(source).then(function(imageBitmap) {
                                scope.source = imageBitmap;
                                scope.emit('loaded', scope);
                            })
                        } else {
                            this._sourceLoaded();
                            scope.emit('loaded', scope);
                        }
                    }
                }
                // If any previous subscribers possible
                else if (wasLoading) {
                        this.emit('error', this);
                    }
            }
        }
    };