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Diffstat (limited to 'src/gui/painting/qplatformbackingstore.cpp')
| -rw-r--r-- | src/gui/painting/qplatformbackingstore.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/gui/painting/qplatformbackingstore.cpp b/src/gui/painting/qplatformbackingstore.cpp index bf7dc55644..3bd9746441 100644 --- a/src/gui/painting/qplatformbackingstore.cpp +++ b/src/gui/painting/qplatformbackingstore.cpp @@ -217,12 +217,17 @@ void QPlatformBackingStore::composeAndFlush(QWindow *window, const QRegion ®i If QPlatformIntegration::RasterGLSurface is supported, either this function or toTexture() must be implemented. + The returned image is only valid until the next operation (resize, paint, scroll, + or flush) on the backingstore. The caller must not store the return value between + calls, but instead call this function before each use, or make an explicit copy. + \sa toTexture() */ QImage QPlatformBackingStore::toImage() const { return QImage(); } + #ifndef QT_NO_OPENGL /*! May be reimplemented in subclasses to return the content of the |