vImageConverter_CreateForCGToCVImageFormat(_:_:_:_:_:)
Creates a vImage converter that converts a Core Graphics-formatted image to a Core Video-formatted image.
Declaration
func vImageConverter_CreateForCGToCVImageFormat(_ srcFormat: UnsafePointer<vImage_CGImageFormat>, _ destFormat: vImageCVImageFormat, _ backgroundColor: UnsafePointer<CGFloat>!, _ flags: vImage_Flags, _ error: UnsafeMutablePointer<vImage_Error>!) -> Unmanaged<vImageConverter>!Parameters
- srcFormat:
The Vimage_cgimageformat structure that describes the pixel format associated with the source buffers.
- destFormat:
The Vimagecvimageformat structure that describes the pixel format associated with the destination image buffers.
- backgroundColor:
In cases where the source format has an alpha channel and the destination doesn’t (or is Noneskipfirst or Noneskiplast) the conversion removes the alpha channel by flattening it against an opaque background color. The background color is specified as three Cgfloat Swift.struct values corresponding to red, green, and blue in sRGB.
- flags:
The options to use when performing this operation. The following flags are supported:
Name
Description
Prints a debug message if the operation fails.
Instructs the converter to spend extra time to achieve better image quality in cases where chroma is upsampled or downsampled as part of the conversion.
Operates as if Kvimagedonottile was passed to Vimageconvert_anytoany(_:_:_:_:_:).
Return Value
kvImageNoError; otherwise, one of the error codes that Data Types and Constants describes.
Discussion
This function creates a vImageConverter instance that’s used with vImageConvert_AnyToAny(_:_:_:_:_:) to convert a Core Graphics formatted image, described by vImage_CGImageFormat, to Core Video image data, described by vImageCVImageFormat.