diff --git a/gfx/layers/opengl/CanvasLayerOGL.cpp b/gfx/layers/opengl/CanvasLayerOGL.cpp
index e10c617b7281..2b7b52979c0f 100644
--- a/gfx/layers/opengl/CanvasLayerOGL.cpp
+++ b/gfx/layers/opengl/CanvasLayerOGL.cpp
@@ -226,9 +226,10 @@ CanvasLayerOGL::RenderLayer(int aPreviousDestination,
 
     mLayerProgram =
       gl()->UploadSurfaceToTexture(mCanvasSurface,
-                                   drawRect,
+                                   nsIntRect(0, 0, drawRect.width, drawRect.height),
                                    mTexture,
-                                   true);
+                                   true,
+                                   drawRect.TopLeft());
   }
   if (!program) { 
     program = mOGLManager->GetColorTextureLayerProgram(mLayerProgram);
diff --git a/layout/reftests/bugs/632781-normalsize.html b/layout/reftests/bugs/632781-normalsize.html
new file mode 100644
index 000000000000..0d5ab8958bda
--- /dev/null
+++ b/layout/reftests/bugs/632781-normalsize.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+  <body>
+    <!--
+      This test makes sure that scrolling a normal sized canvas would correctly
+      scroll its contents.  Normal sized canvases are accelerated, so this test
+      makes sure that the accelerated code path for this operaton works correctly.
+
+      The padding in this test is added mostly to make sure that scrollLeft/Top
+      correctly skip the padding.
+    -->
+    <div id="container" style="width: 100px; height: 100px; padding: 10px; overflow: hidden">
+      <canvas width="300" height="300" id="c"></canvas>
+    </div>
+    <script>
+      var ctx = document.getElementById("c").getContext("2d");
+      ctx.fillStyle = "red";
+      ctx.fillRect(0, 0, 300, 100);
+      ctx.fillStyle = "green";
+      ctx.fillRect(0, 100, 300, 200);
+      var container = document.getElementById("container");
+      container.scrollLeft = 10;
+      container.scrollTop = 110;
+    </script>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/632781-ref.html b/layout/reftests/bugs/632781-ref.html
new file mode 100644
index 000000000000..30b26fa5b33d
--- /dev/null
+++ b/layout/reftests/bugs/632781-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+  <body>
+    <div style="width: 120px; height: 120px; overflow: hidden">
+      <canvas width="120" height="120" id="c"></canvas>
+    </div>
+    <script>
+      var ctx = document.getElementById("c").getContext("2d");
+      ctx.fillStyle = "green";
+      ctx.fillRect(0, 0, 120, 120);
+    </script>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/632781-verybig.html b/layout/reftests/bugs/632781-verybig.html
new file mode 100644
index 000000000000..469ba214fe24
--- /dev/null
+++ b/layout/reftests/bugs/632781-verybig.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <body>
+    <!--
+      This test makes sure that scrolling a huge canvas would correctly scroll
+      its contents.  We don't accelerate extremely large canvases because of
+      GPU maximum texture size limits, so this test makes sure that the
+      non-accelerated code path for this operation works correctly.
+
+      The padding in this test is added mostly to make sure that scrollLeft/Top
+      correctly skip the padding.
+    -->
+    <div id="container" style="width: 100px; height: 100px; padding: 10px; overflow: hidden">
+      <canvas width="10000" height="10000" id="c"></canvas>
+    </div>
+    <script>
+      var ctx = document.getElementById("c").getContext("2d");
+      ctx.fillStyle = "red";
+      ctx.fillRect(0, 0, 10000, 5000);
+      ctx.fillStyle = "green";
+      ctx.fillRect(0, 5000, 10000, 5000);
+      var container = document.getElementById("container");
+      container.scrollLeft = 10;
+      container.scrollTop = 5010;
+    </script>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index b27e5b72318a..700828f26017 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1611,3 +1611,5 @@ random-if(winWidget) HTTP(..) == 621918-2.svg 621918-2-ref.svg # same 1px issue
 == 625409-1.html 625409-1-ref.html
 == 627393-1.html about:blank
 == 631352-1.html 631352-1-ref.html
+== 632781-verybig.html 632781-ref.html
+== 632781-normalsize.html 632781-ref.html
