Function

vImageConvert_RGBA5551toRGB565(_:_:_:)

Converts an RGBA5551 image to an RGB565 image, with loss of alpha.

Declaration

func vImageConvert_RGBA5551toRGB565(_ src: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ flags: vImage_Flags) -> vImage_Error

Parameters

src

A pointer to a vImage buffer structure that contains the source image whose data you want to convert.

dest

A pointer to a vImage buffer data structure. You're responsible for filling out the height, width, and rowBytes fields 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.

flags

The options to use when performing the operation. If you plan to perform your own tiling or use multithreading, pass kvImageDoNotTile.

Return Value

kvImageNoError; otherwise, one of the error codes described in Data Types and Constants.

Discussion

If you need to process the alpha information first—for example, unpremultiplying or flattening—convert to 8-bit per channel first. vImage defines both RGB565 and ARGB1555 to be host-endian formats. On Intel, ARM, and other little-endian systems, they're little-endian uint16_t in memory. On a big-endian system, they're big-endian uint16_t.

See Also

Converting from RGBA Formats

func vImageConvert_RGBAFFFFtoRGBFFF(UnsafePointer<vImage_Buffer>!, UnsafePointer<vImage_Buffer>!, vImage_Flags) -> vImage_Error

Converts a four-channel RGBAFFFF image to a three-channel RGBFFF image by removing the alpha channel.

func vImageConvert_RGBA8888toRGB888(UnsafePointer<vImage_Buffer>, UnsafePointer<vImage_Buffer>, vImage_Flags) -> vImage_Error

Converts a four-channel RGBA8888 image to a three-channel RGB888 image by removing the alpha channel.

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