virtual TextureSet FirstFrame() = 0;
/**
+ * Get the next frame. If it's not ready, this will trigger the
+ * sending of FrameReady() when the image becomes ready.
+ */
+ virtual TextureSet NextFrame() = 0;
+
+ /**
* Get the Nth frame. If it's not ready, this will trigger the
* sending of FrameReady() when the image becomes ready.
*/
/**
* Get the interval of Nth frame.
*/
- virtual uint32_t GetFrameInterval( uint32_t frameIndex ) = 0;
+ virtual uint32_t GetFrameInterval( uint32_t frameIndex ) const = 0;
+
+ /**
+ * Get the current rendered frame index.
+ * If there isn't any loaded frame, returns -1.
+ */
+ virtual int32_t GetCurrentFrameIndex() const = 0;
private: