Transforms an RGBAFFFF image in nonpremultiplied alpha format into an image in premultiplied alpha format.
- iOS 5.0+
- macOS 10.4+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
A pointer to a vImage buffer structure that contains the nonpremultiplied data for the top source image.
A pointer to a vImage buffer data structure. You're responsible for filling out the
rowfields of this structure, and for allocating a data buffer of the appropriate size. On return, the data buffer this structure points to contains the destination image data. When you no longer need the data buffer, you must deallocate the memory.
The options to use when performing the operation. If you plan to perform your own tiling or use multithreading, pass
Image Do Not Tile
This function gets the required alpha information from the alpha channel of the original image. The alpha channel is copied over unchanged to the destination image.