From 939c748aa11cdf34540aae569cd6f7b026a266a1 Mon Sep 17 00:00:00 2001
From: pacien
Date: Wed, 18 Jul 2018 23:10:40 +0200
Subject: Workaround for pdfjs font bug

---
 pointless/viewer/screen.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'pointless/viewer/screen.js')

diff --git a/pointless/viewer/screen.js b/pointless/viewer/screen.js
index 8a6891c..0c1c3ad 100644
--- a/pointless/viewer/screen.js
+++ b/pointless/viewer/screen.js
@@ -38,11 +38,28 @@ class Screen {
     this.context.transform(1, 0, 0, 1, xOffset, 0);
   }
 
+  _makeWorkCanvas(width, height) {
+    var canvas = document.createElement("canvas");
+    canvas.width = width;
+    canvas.height = height;
+    return canvas;
+  }
+
+  _transferCanvas(source) {
+    this.context.drawImage(source, 0, 0);
+  }
+
   _paintPage() {
     var renderRatio = this.canvas.height / this.page.getViewport(1).height;
     var renderViewport = this.page.getViewport(renderRatio);
-    var renderContext = { canvasContext: this.context, viewport: renderViewport };
-    this.page.render(renderContext);
+    var workCanvas = this._makeWorkCanvas(renderViewport.width, renderViewport.height);
+    var workContext = workCanvas.getContext("2d");
+    var renderContext = { canvasContext: workContext, viewport: renderViewport };
+
+    var self = this;
+    this.page.render(renderContext).then(function() {
+      self._transferCanvas(workCanvas);
+    });
   }
 
   _refreshPage() {
-- 
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