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-rw-r--r--include/effects/SkLayerRasterizer.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/include/effects/SkLayerRasterizer.h b/include/effects/SkLayerRasterizer.h
index fc21a7cd18..9d4c8239f2 100644
--- a/include/effects/SkLayerRasterizer.h
+++ b/include/effects/SkLayerRasterizer.h
@@ -39,9 +39,10 @@ public:
/**
* Pass queue of layers on to newly created layer rasterizer and return it. The builder
- * *cannot* be used any more after calling this function.
+ * *cannot* be used any more after calling this function. If no layers have been added,
+ * returns NULL.
*
- * The caller is responsible for calling unref() on the returned object.
+ * The caller is responsible for calling unref() on the returned object, if non NULL.
*/
SkLayerRasterizer* detachRasterizer();
@@ -51,11 +52,11 @@ public:
* *may* be used after calling this function. It will continue to hold any layers
* previously added, so consecutive calls to this function will return identical objects,
* and objects returned by future calls to this function contain all the layers in
- * previously returned objects.
+ * previously returned objects. If no layers have been added, returns NULL.
*
* Future calls to addLayer will not affect rasterizers previously returned by this call.
*
- * The caller is responsible for calling unref() on the returned object.
+ * The caller is responsible for calling unref() on the returned object, if non NULL.
*/
SkLayerRasterizer* snapshotRasterizer() const;