QtOpenGL/plugins/platformsupport: use new QRegion::begin()/end() instead of rect()

Saves e.g. ~900b and ~2900b in text size in QtOpenGL and
XcbQpa libs, resp., on optimized GCC 5.3 Linux AMD64 builds.

Change-Id: Id904689164ca32df41118a23747c70048d8e6604
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 868e9ed265..6365a7421b 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -1006,11 +1006,11 @@ void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
     glStencilMask(0xff); // Enable stencil writes
 
     if (dirtyStencilRegion.intersects(currentScissorBounds)) {
-        QVector<QRect> clearRegion = dirtyStencilRegion.intersected(currentScissorBounds).rects();
+        const QRegion clearRegion = dirtyStencilRegion.intersected(currentScissorBounds);
         glClearStencil(0); // Clear to zero
-        for (int i = 0; i < clearRegion.size(); ++i) {
+        for (const QRect &rect : clearRegion) {
 #ifndef QT_GL_NO_SCISSOR_TEST
-            setScissor(clearRegion.at(i));
+            setScissor(rect);
 #endif
             glClear(GL_STENCIL_BUFFER_BIT);
         }