Create a bitmap. If a client-side pixel buffer has been specified, the bitmap does not own the pixel buffer unless the BITMAP_OWNED flag is set. If the BITMAP_OWNED flag is set but a NULL pixel buffer is passed, a pixel buffer will be automatically created and will be owned by the bitmap. The flags BITMAP_SHMI and BITMAP_SHMP may be specified for large bitmaps to instruct render() to use shared memory to communicate with the server.
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