Loads an image from the data source.
This method must be overridden by subclasses. The base implementation will crash if called.
Called on-demand when a frame image is requested.
- Parameter imageName: The filename of the image (e.g., "frame_00000000.jpg")
- Returns: The image as a CGImage, or nil if loading fails
- Important: Subclasses must override this method. Do not call the base implementation.
Loads an image from the data source.
This method must be overridden by subclasses. The base implementation will crash if called.
Called on-demand when a frame image is requested.
- Parameter imageName: The filename of the image (e.g., "frame_00000000.jpg")
- Returns: The image as a
CGImage, ornilif loading fails- Important: Subclasses must override this method. Do not call the base implementation.