Use C++ <cmath> instead of <math.h>

Including math.h can pollute the default namespace, and break
some compilers if cmath versions of the method are declared as using.

Switching to C++ math functions also greatly simplifies handling of
float qreal as C++ automatically chooses the right method.

[ChangeLog][QtCore][QtMath] qmath.h no longer includes math.h, so any
sources depending on that indirect inclusion may fail to build.

Change-Id: I4d0e331dafba354ec05dc5052e61ef4ff8d387fe
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/opengl/qopenglpaintengine.cpp b/src/gui/opengl/qopenglpaintengine.cpp
index c23e0c28ea..576558022e 100644
--- a/src/gui/opengl/qopenglpaintengine.cpp
+++ b/src/gui/opengl/qopenglpaintengine.cpp
@@ -462,8 +462,8 @@ void QOpenGL2PaintEngineExPrivate::updateMatrix()
     // anti-aliased text rendering. In such cases, we snap the translate to the pixel grid.
     if (snapToPixelGrid && transform.type() == QTransform::TxTranslate) {
         // 0.50 needs to rounded down to 0.0 for consistency with raster engine:
-        dx = ceilf(dx - 0.5f);
-        dy = ceilf(dy - 0.5f);
+        dx = std::ceil(dx - 0.5f);
+        dy = std::ceil(dy - 0.5f);
     }
     pmvMatrix[0][0] = (wfactor * transform.m11())  - transform.m13();
     pmvMatrix[1][0] = (wfactor * transform.m21())  - transform.m23();