Transforms an ARGB8888 image to an RGB888 image against an opaque background of the provided color.
- iOS 5.0+
- macOS 10.4+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
A pointer to a vImage buffer structure that contains the source image whose data you want to flatten.
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.
An 8-bit interleaved pixel value.
Trueif the source image is premultiplied; otherwise,
The options to use when performing the operation. If you plan to perform your own tiling or use multithreading, pass
Image Do Not Tile
If the source image uses premultiplied data, the function calculates each channel value for a pixel in the destination image as follows (where i is the source value for the channel):
If the source image does not use premultiplied data, the function calculates each channel value for a pixel in the destination image as follows (where i is the source value for the channel):
The source and destination buffers must have the same height and width.