Use RGBA8888 always in the eglfs backingstore

Do not try to be clever, this format works always.

Using RGBX8888 for windows without alpha buffer was a bad idea because
it broke renderToTexture widgets (QQuickWidget, QOpenGLWidget) which
failed to properly draw the transparent rect with this format.

Change-Id: I295d2f8c17490b59cc5e6b9d81035360da28ab3d
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp b/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp
index 8abfbf2763..3cb31e36ec 100644
--- a/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp
+++ b/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp
@@ -231,14 +231,7 @@ void QEGLPlatformBackingStore::resize(const QSize &size, const QRegion &staticCo
     if (!dstWin || (!dstWin->isRaster() && dstWin->window()->surfaceType() != QSurface::RasterGLSurface))
         return;
 
-    // Child windows do not get real native surfaces and so share the same
-    // format as the parent, regardless of what has been requested. The
-    // exception is WA_TranslucentBackground that sets alphaBufferSize in the
-    // requested format, this has to be taken into account when compositing.
-    const bool translucent = m_window->window()->requestedFormat().alphaBufferSize() > 0;
-    const QImage::Format format = translucent ? QImage::Format_RGBA8888 : QImage::Format_RGBX8888;
-
-    m_image = QImage(size, format);
+    m_image = QImage(size, QImage::Format_RGBA8888);
 
     m_window->create();