1 files changed, 25 insertions, 31 deletions
diff --git a/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp b/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp
index a205e5ddea..dcfc4433e6 100644
--- a/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp
+++ b/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp
@@ -1,41 +1,35 @@
-/****************************************************************************
-**
-** Copyright (C) 2019 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:GPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3 or (at your option) any later version
-** approved by the KDE Free Qt Foundation. The licenses are as published by
-** the Free Software Foundation and appearing in the file LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
+// Copyright (C) 2019 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include "qwasmoffscreensurface.h"
 
-QWasmOffscrenSurface::QWasmOffscrenSurface(QOffscreenSurface *offscreenSurface)
-    :QPlatformOffscreenSurface(offscreenSurface)
+QT_BEGIN_NAMESPACE
+
+QWasmOffscreenSurface::QWasmOffscreenSurface(QOffscreenSurface *offscreenSurface)
+    : QPlatformOffscreenSurface(offscreenSurface), m_offscreenCanvas(emscripten::val::undefined())
 {
+    const auto offscreenCanvasClass = emscripten::val::global("OffscreenCanvas");
+    // The OffscreenCanvas is not supported on some browsers, most notably on Safari.
+    if (!offscreenCanvasClass)
+        return;
+
+    m_offscreenCanvas = offscreenCanvasClass.new_(offscreenSurface->size().width(),
+                                                  offscreenSurface->size().height());
+
+    m_specialTargetId = std::string("!qtoffscreen_") + std::to_string(uintptr_t(this));
 
+    emscripten::val::module_property("specialHTMLTargets")
+            .set(m_specialTargetId, m_offscreenCanvas);
 }
 
-QWasmOffscrenSurface::~QWasmOffscrenSurface()
+QWasmOffscreenSurface::~QWasmOffscreenSurface()
 {
+    emscripten::val::module_property("specialHTMLTargets").delete_(m_specialTargetId);
+}
 
+bool QWasmOffscreenSurface::isValid() const
+{
+    return !m_offscreenCanvas.isNull() && !m_offscreenCanvas.isUndefined();
 }
+
+QT_END_NAMESPACE