add ability to clear out contents of ImgFrame #686
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also return a reference to the shared_ptr buffer, so the caller can decide if they want to incur an ref-count increment or not.
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also return a reference to the shared_ptr buffer, so the caller can decide if they want to incur an ref-count increment or not.
Really the 'img' member seems unnecessary, and can be replaced with a get function that does the cast each time the buffer is needed. I'm not sure if keeping the size of the class the same is a requirement (which is why I left it as a * for now).
If this workflow is acceptable, I'd expand it to the other data types as well.