2 files changed, 20 insertions, 3 deletions
diff --git a/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp b/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp
index d70dc7bdaa..ffee43852d 100644
--- a/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp
+++ b/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp
@@ -53,6 +53,10 @@ QT_BEGIN_NAMESPACE
 #define GL_FRAMEBUFFER_SRGB 0x8DB9
 #endif
 
+#ifndef GL_FRAMEBUFFER_SRGB_CAPABLE
+#define GL_FRAMEBUFFER_SRGB_CAPABLE 0x8DBA
+#endif
+
 static inline QVector4D qsg_premultiply(const QVector4D &c, float globalOpacity)
 {
     float o = c.w() * globalOpacity;
@@ -199,7 +203,11 @@ void QSG24BitTextMaskShader::initialize()
     if (QOpenGLContext::currentContext()->hasExtension(QByteArrayLiteral("GL_ARB_framebuffer_sRGB"))
             && m_glyphFormat == QFontEngine::Format_A32
             && qAbs(fontSmoothingGamma() - 2.2) < 0.25) {
-        m_useSRGB = true;
+        QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
+        GLint srgbCapable = 0;
+        funcs->glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE, &srgbCapable);
+        if (srgbCapable)
+            m_useSRGB = true;
     }
 }
 
diff --git a/src/quick/scenegraph/util/qsgtexture.cpp b/src/quick/scenegraph/util/qsgtexture.cpp
index 91d2c8674d..c89ad7a608 100644
--- a/src/quick/scenegraph/util/qsgtexture.cpp
+++ b/src/quick/scenegraph/util/qsgtexture.cpp
@@ -35,6 +35,7 @@
 #include <qopenglfunctions.h>
 #include <QtQuick/private/qsgcontext_p.h>
 #include <qthread.h>
+#include <qmath.h>
 #include <private/qquickprofiler_p.h>
 #include <private/qqmlglobal_p.h>
 #include <QtGui/qguiapplication.h>
@@ -75,13 +76,11 @@ static bool qsg_leak_check = !qgetenv("QML_LEAK_CHECK").isEmpty();
 
 QT_BEGIN_NAMESPACE
 
-#ifndef QT_NO_DEBUG
 inline static bool isPowerOfTwo(int x)
 {
     // Assumption: x >= 1
     return x == (x & -x);
 }
-#endif
 
 QSGTexturePrivate::QSGTexturePrivate()
     : wrapChanged(false)
@@ -688,6 +687,16 @@ void QSGPlainTexture::bind()
         m_texture_size = tmp.size();
     }
 
+    // Scale to a power of two size if mipmapping is requested and the
+    // texture is npot and npot textures are not properly supported.
+    if (mipmapFiltering() != QSGTexture::None
+        && (!isPowerOfTwo(m_texture_size.width()) || !isPowerOfTwo(m_texture_size.height()))
+        && !funcs->hasOpenGLFeature(QOpenGLFunctions::NPOTTextures)) {
+        tmp = tmp.scaled(qNextPowerOfTwo(m_texture_size.width()), qNextPowerOfTwo(m_texture_size.height()),
+                         Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+        m_texture_size = tmp.size();
+    }
+
     if (tmp.width() * 4 != tmp.bytesPerLine())
         tmp = tmp.copy();