Replace the PDFJS.disableWebGL option with a enableWebGL option passed, via BaseViewer/PDFPageView, to PDFPageProxy.render

Please note that the, pre-existing, viewer preference is already named `enableWebGL`; fixes 4919.

src/display/api.js

@@ -707,6 +707,8 @@ var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
  *                                calling of PDFPage.getViewport method.
  * @property {string} intent - Rendering intent, can be 'display' or 'print'
  *                    (default value is 'display').
+ * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated
+ *   rendering for some operations. The default value is `false`.
  * @property {boolean} renderInteractiveForms - (optional) Whether or not
  *                     interactive form elements are rendered in the display
  *                     layer. If so, we do not render them on canvas as well.
@@ -828,9 +830,7 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
       var renderingIntent = (params.intent === 'print' ? 'print' : 'display');
       var canvasFactory = params.canvasFactory || new DOMCanvasFactory();
       let webGLContext = new WebGLContext({
-        // TODO: When moving this parameter from `PDFJS` to {RenderParameters},
-        //       change its name to `enableWebGL` instead.
-        enable: !getDefaultSetting('disableWebGL'),
+        enable: params.enableWebGL,
       });
 
       if (!this.intentStates[renderingIntent]) {

src/display/dom_utils.js

@@ -345,8 +345,6 @@ function getDefaultSetting(id) {
       return globalSettings ? globalSettings.disableFontFace : false;
     case 'disableCreateObjectURL':
       return globalSettings ? globalSettings.disableCreateObjectURL : false;
-    case 'disableWebGL':
-      return globalSettings ? globalSettings.disableWebGL : true;
     case 'cMapUrl':
       return globalSettings ? globalSettings.cMapUrl : null;
     case 'cMapPacked':

src/display/global.js

@@ -180,13 +180,6 @@ PDFJS.postMessageTransfers = (PDFJS.postMessageTransfers === undefined ?
 PDFJS.disableCreateObjectURL = (PDFJS.disableCreateObjectURL === undefined ?
                                 false : PDFJS.disableCreateObjectURL);
 
-/**
- * Disables WebGL usage.
- * @var {boolean}
- */
-PDFJS.disableWebGL = (PDFJS.disableWebGL === undefined ?
-                      true : PDFJS.disableWebGL);
-
 /**
  * Specifies the |target| attribute for external links.
  * The constants from {LinkTarget} should be used:

web/app.js

@@ -139,6 +139,7 @@ let PDFViewerApplication = {
   isInitialViewSet: false,
   downloadComplete: false,
   viewerPrefs: {
+    enableWebGL: false,
     sidebarViewOnLoad: SidebarView.NONE,
     pdfBugEnabled: false,
     showPreviousViewOnLoad: true,
@@ -203,7 +204,7 @@ let PDFViewerApplication = {
 
     return Promise.all([
       preferences.get('enableWebGL').then(function resolved(value) {
-        PDFJS.disableWebGL = !value;
+        viewerPrefs['enableWebGL'] = value;
       }),
       preferences.get('sidebarViewOnLoad').then(function resolved(value) {
         viewerPrefs['sidebarViewOnLoad'] = value;
@@ -304,7 +305,7 @@ let PDFViewerApplication = {
         PDFJS.disableHistory = (hashParams['disablehistory'] === 'true');
       }
       if ('webgl' in hashParams) {
-        PDFJS.disableWebGL = (hashParams['webgl'] !== 'true');
+        viewerPrefs['enableWebGL'] = (hashParams['webgl'] === 'true');
       }
       if ('useonlycsszoom' in hashParams) {
         PDFJS.useOnlyCssZoom = (hashParams['useonlycsszoom'] === 'true');
@@ -394,6 +395,7 @@ let PDFViewerApplication = {
         linkService: pdfLinkService,
         downloadManager,
         renderer: viewerPrefs['renderer'],
+        enableWebGL: viewerPrefs['enableWebGL'],
         l10n: this.l10n,
         textLayerMode: viewerPrefs['textLayerMode'],
         imageResourcesPath: PDFJS.imageResourcesPath,
@@ -1172,7 +1174,7 @@ let PDFViewerApplication = {
                   info.PDFFormatVersion + ' ' + (info.Producer || '-').trim() +
                   ' / ' + (info.Creator || '-').trim() + ']' +
                   ' (PDF.js: ' + (version || '-') +
-                  (!PDFJS.disableWebGL ? ' [WebGL]' : '') + ')');
+                  (this.viewerPrefs['enableWebGL'] ? ' [WebGL]' : '') + ')');
 
       let pdfTitle;
       if (metadata && metadata.has('dc:title')) {

web/base_viewer.js

@@ -52,6 +52,8 @@ const DEFAULT_CACHE_SIZE = 10;
  *   rotation of pages whose orientation differ from the first page upon
  *   printing. The default is `false`.
  * @property {string} renderer - 'canvas' or 'svg'. The default is 'canvas'.
+ * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated
+ *   rendering for some operations. The default value is `false`.
  * @property {boolean} useOnlyCssZoom - (optional) Enables CSS only zooming.
  *   The default value is `false`.
  * @property {number} maxCanvasPixels - (optional) The maximum supported canvas
@@ -123,6 +125,7 @@ class BaseViewer {
     this.renderInteractiveForms = options.renderInteractiveForms || false;
     this.enablePrintAutoRotate = options.enablePrintAutoRotate || false;
     this.renderer = options.renderer || RendererType.CANVAS;
+    this.enableWebGL = options.enableWebGL || false;
     this.useOnlyCssZoom = options.useOnlyCssZoom || false;
     this.maxCanvasPixels = options.maxCanvasPixels;
     this.l10n = options.l10n || NullL10n;
@@ -392,6 +395,7 @@ class BaseViewer {
           imageResourcesPath: this.imageResourcesPath,
           renderInteractiveForms: this.renderInteractiveForms,
           renderer: this.renderer,
+          enableWebGL: this.enableWebGL,
           useOnlyCssZoom: this.useOnlyCssZoom,
           maxCanvasPixels: this.maxCanvasPixels,
           l10n: this.l10n,

web/pdf_page_view.js

@@ -43,6 +43,8 @@ import { viewerCompatibilityParams } from './viewer_compatibility';
  * @property {boolean} renderInteractiveForms - Turns on rendering of
  *   interactive form elements. The default is `false`.
  * @property {string} renderer - 'canvas' or 'svg'. The default is 'canvas'.
+ * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated
+ *   rendering for some operations. The default value is `false`.
  * @property {boolean} useOnlyCssZoom - (optional) Enables CSS only zooming.
  *   The default value is `false`.
  * @property {number} maxCanvasPixels - (optional) The maximum supported canvas
@@ -86,6 +88,7 @@ class PDFPageView {
     this.textLayerFactory = options.textLayerFactory;
     this.annotationLayerFactory = options.annotationLayerFactory;
     this.renderer = options.renderer || RendererType.CANVAS;
+    this.enableWebGL = options.enableWebGL || false;
     this.l10n = options.l10n || NullL10n;
 
     this.paintTask = null;
@@ -571,6 +574,7 @@ class PDFPageView {
       canvasContext: ctx,
       transform,
       viewport: this.viewport,
+      enableWebGL: this.enableWebGL,
       renderInteractiveForms: this.renderInteractiveForms,
     };
     let renderTask = this.pdfPage.render(renderContext);