Use the browser compositor for drawing windows on WASM

Make the browser compositor draw the window non-client area (using css
+ html). Get rid of OpenGL usage in non-OpenGL windows and use canvas
2d context instead to blit the texture (QImage).

Also, as part of the change, remove the deprecated canvas element support
in QScreen.

Fixes: QTBUG-107116
Fixes: QTBUG-107219
Change-Id: I65f0d91831c806315685ca681ac0e416673f5cd5
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Reviewed-by: Aleksandr Reviakin <aleksandr.reviakin@qt.io>
Reviewed-by: David Skoland <david.skoland@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/plugins/platforms/wasm/qwasminputcontext.h b/src/plugins/platforms/wasm/qwasminputcontext.h
index 58f3920c30..0886ae8d84 100644
--- a/src/plugins/platforms/wasm/qwasminputcontext.h
+++ b/src/plugins/platforms/wasm/qwasminputcontext.h
@@ -29,10 +29,11 @@ public:
     bool isValid() const override { return true; }
 
     void focusWindowChanged(QWindow *focusWindow);
-    emscripten::val focusCanvas();
     void inputStringChanged(QString &, QWasmInputContext *context);
 
 private:
+    emscripten::val focusScreenElement();
+
     bool m_inputPanelVisible = false;
 
     QPointer<QWindow> m_focusWindow;