Merge "Merge remote-tracking branch 'origin/5.6' into dev" into refs/staging/dev

1 files changed, 35 insertions, 0 deletions

diff --git a/src/gui/image/qimage_p.h b/src/gui/image/qimage_p.h
index 3badda0864..f9ad6c0ac0 100644
--- a/src/gui/image/qimage_p.h
+++ b/src/gui/image/qimage_p.h
@@ -161,10 +161,45 @@ inline int qt_depthForFormat(QImage::Format format)
     }
     return depth;
 }
+
 #if defined(_M_ARM)
 #pragma optimize("", on)
 #endif
 
+inline QImage::Format qt_alphaVersion(QImage::Format format)
+{
+    switch (format) {
+    case QImage::Format_RGB16:
+        return QImage::Format_ARGB8565_Premultiplied;
+    case QImage::Format_RGB555:
+        return QImage::Format_ARGB8555_Premultiplied;
+    case QImage::Format_RGB666:
+        return QImage::Format_ARGB6666_Premultiplied;
+    case QImage::Format_RGB444:
+        return QImage::Format_ARGB4444_Premultiplied;
+    case QImage::Format_RGBX8888:
+        return QImage::Format_RGBA8888_Premultiplied;
+    case QImage::Format_BGR30:
+        return QImage::Format_A2BGR30_Premultiplied;
+    case QImage::Format_RGB30:
+        return QImage::Format_A2RGB30_Premultiplied;
+    default:
+        break;
+    }
+    return QImage::Format_ARGB32_Premultiplied;
+}
+
+inline QImage::Format qt_alphaVersionForPainting(QImage::Format format)
+{
+    QImage::Format toFormat = qt_alphaVersion(format);
+#if defined(__ARM_NEON__) || defined(__SSE2__)
+    // If we are switching depth anyway and we have optimized ARGB32PM routines, upgrade to that.
+    if (qt_depthForFormat(format) != qt_depthForFormat(toFormat))
+        toFormat = QImage::Format_ARGB32_Premultiplied;
+#endif
+    return toFormat;
+}
+
 QT_END_NAMESPACE
 
 #endif // QIMAGE_P_H