Add the toDOMRect/fromDOMRect functions to QRectF

These are very helpful when converting to and from DOMRect.

Change-Id: I4a7fc6318f45bed8e2b82fd5d6ec174dc1762326
Fixes: QTBUG-107740
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

src/corelib/CMakeLists.txt

@@ -574,6 +574,10 @@ qt_internal_extend_target(Core CONDITION WIN32
         userenv
 )
 
+qt_internal_extend_target(Core CONDITION WASM
+    SOURCES
+        kernel/qcore_wasm.cpp)
+
 qt_internal_extend_target(Core CONDITION APPLE
     SOURCES
         global/qoperatingsystemversion_darwin.mm

src/corelib/kernel/qcore_wasm.cpp

@@ -0,0 +1,45 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include <QtCore/qrect.h>
+
+#include <emscripten/val.h>
+
+#if !defined(Q_OS_WASM)
+static_assert(false, "This is a wasm-only file.");
+#endif // !defined(Q_OS_WASM)
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    Converts the DOMRect (https://www.w3.org/TR/geometry-1/) \a domRect to QRectF. The behavior is
+    undefined if the provided parameter is not a DOMRect.
+
+    \since 6.5
+    \ingroup platform-type-conversions
+
+    \sa toDOMRect()
+*/
+QRectF QRectF::fromDOMRect(emscripten::val domRect)
+{
+    Q_ASSERT_X(domRect["constructor"]["name"].as<std::string>() == "DOMRect", Q_FUNC_INFO,
+               "Passed object is not a DOMRect");
+
+    return QRectF(domRect["left"].as<qreal>(), domRect["top"].as<qreal>(),
+                  domRect["width"].as<qreal>(), domRect["height"].as<qreal>());
+}
+
+/*!
+    Converts this object to a DOMRect (https://www.w3.org/TR/geometry-1/).
+
+    \since 6.5
+    \ingroup platform-type-conversions
+
+    \sa fromDOMRect()
+*/
+emscripten::val QRectF::toDOMRect() const
+{
+    return emscripten::val::global("DOMRect").new_(left(), top(), width(), height());
+}
+
+QT_END_NAMESPACE

src/corelib/tools/qrect.h

@@ -16,6 +16,11 @@
 #if defined(Q_OS_DARWIN) || defined(Q_QDOC)
 struct CGRect;
 #endif
+#if defined(Q_OS_WASM) || defined(Q_QDOC)
+namespace emscripten {
+class val;
+}
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -586,6 +591,11 @@ public:
     [[nodiscard]] CGRect toCGRect() const noexcept;
 #endif
 
+#if defined(Q_OS_WASM) || defined(Q_QDOC)
+    [[nodiscard]] static QRectF fromDOMRect(emscripten::val domRect);
+    [[nodiscard]] emscripten::val toDOMRect() const;
+#endif
+
 private:
     qreal xp;
     qreal yp;