Converts an RGBA8888 image into an RGB565 image.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
A pointer to a vImage buffer structure that contains the source image whose data you want to convert.
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
The alpha channel in the RGBA8888 image is ignored. (The RGB565 format has 16-bit pixels with 5 bits for red, 6 for green, and 5 for blue.) The function calculates the pixels in the destination image as follows: