Support window masks on WASM

QWasmWindow is now implementing the setMask method, which translates the received QRegion to a css clip path Fixes: QTBUG-73260 Change-Id: Ie934c1e6ab650426bfc32154bf9e49a4a2aeb45b Reviewed-by: Aleksandr Reviakin <aleksandr.reviakin@qt.io> Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io> 

2 files changed, 23 insertions, 2 deletions

diff --git a/src/plugins/platforms/wasm/qwasmwindow.cpp b/src/plugins/platforms/wasm/qwasmwindow.cpp
index be0dd74797a..1dc43b61bb4 100644
--- a/src/plugins/platforms/wasm/qwasmwindow.cpp
+++ b/src/plugins/platforms/wasm/qwasmwindow.cpp
@@ -20,9 +20,9 @@
 #include "qwasmaccessibility.h"

 #include <iostream>
-#include <emscripten/val.h>
+#include <sstream>

-#include <GL/gl.h>
+#include <emscripten/val.h>

 #include <QtCore/private/qstdweb_p.h>

@@ -544,6 +544,26 @@ bool QWasmWindow::windowEvent(QEvent *event)
 }
 }

+void QWasmWindow::setMask(const QRegion &region)
+{
+ if (region.isEmpty()) {
+ m_qtWindow["style"].set("clipPath", emscripten::val(""));
+ return;
+ }
+
+ std::ostringstream cssClipPath;
+ cssClipPath << "path('";
+ for (const auto &rect : region) {
+ const auto cssRect = rect.adjusted(0, 0, 1, 1);
+ cssClipPath << "M " << cssRect.left() << " " << cssRect.top() << " ";
+ cssClipPath << "L " << cssRect.right() << " " << cssRect.top() << " ";
+ cssClipPath << "L " << cssRect.right() << " " << cssRect.bottom() << " ";
+ cssClipPath << "L " << cssRect.left() << " " << cssRect.bottom() << " z ";
+ }
+ cssClipPath << "')";
+ m_qtWindow["style"].set("clipPath", emscripten::val(cssClipPath.str()));
+}
+
 std::string QWasmWindow::canvasSelector() const
 {
 return "!qtwindow" + std::to_string(m_winId);
diff --git a/src/plugins/platforms/wasm/qwasmwindow.h b/src/plugins/platforms/wasm/qwasmwindow.h
index d90e828283c..7f4047b758b 100644
--- a/src/plugins/platforms/wasm/qwasmwindow.h
+++ b/src/plugins/platforms/wasm/qwasmwindow.h
@@ -75,6 +75,7 @@ public:
 bool setKeyboardGrabEnabled(bool) override { return false; }
 bool setMouseGrabEnabled(bool grab) final;
 bool windowEvent(QEvent *event) final;
+ void setMask(const QRegion &region) final;

 QWasmScreen *platformScreen() const;
 void setBackingStore(QWasmBackingStore *store) { m_backingStore = store; }