Instance Property

edgeMode

The edge mode to use when texture reads stray off the edge of an image.

Declaration

@property(readwrite, nonatomic) MPSImageEdgeMode edgeMode;

Discussion

Most kernel objects can read off the edge of a source image. This can happen because of a negative offset property, because the offset + clipRect.size is larger than the source image, or because the filter uses neighboring pixels in its calculations (e.g. convolution filters).

The default value is usually MPSImageEdgeModeZero, but some kernels default to the MPSImageEdgeModeClamp value instead if an edge mode of zero is either unsupported or undefined.

See Also

Properties

offset

The position of the destination clip rectangle origin relative to the source buffer.

MPSOffset

A signed coordinate with x, y, and z components.

clipRect

An optional clip rectangle to use when writing data. Only the pixels in the rectangle will be overwritten.

MPSRegion

A region of an image.

MPSImageEdgeMode

The options used to control the edge behavior of an image filter when it reads outside the bounds of a source texture.