Struct MTLFXSpatialScalerDescriptor

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pub struct MTLFXSpatialScalerDescriptor { /* private fields */ }

Available on crate feature MTLFXSpatialScaler only.

Expand description

A set of properties that configure a spatial scaling effect, and a factory method that creates the effect.

Implementations§

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impl MTLFXSpatialScalerDescriptor

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pub unsafe fn colorTextureFormat(&self) -> MTLPixelFormat

The pixel format of the input color texture for the spatial scaler you create with this descriptor.

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pub unsafe fn setColorTextureFormat(&self, color_texture_format: MTLPixelFormat)

Setter for colorTextureFormat.

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pub unsafe fn outputTextureFormat(&self) -> MTLPixelFormat

The pixel format of the output texture for the spatial scaler you create with this descriptor.

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pub unsafe fn setOutputTextureFormat( &self, output_texture_format: MTLPixelFormat, )

Setter for outputTextureFormat.

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pub unsafe fn inputWidth(&self) -> NSUInteger

The width of the input color texture for the spatial scaler you create with this descriptor.

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pub unsafe fn setInputWidth(&self, input_width: NSUInteger)

Setter for inputWidth.

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pub unsafe fn inputHeight(&self) -> NSUInteger

The height of the input color texture for the spatial scaler you create with this descriptor.

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pub unsafe fn setInputHeight(&self, input_height: NSUInteger)

Setter for inputHeight.

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pub unsafe fn outputWidth(&self) -> NSUInteger

The width of the output color texture for the spatial scaler you create with this descriptor.

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pub unsafe fn setOutputWidth(&self, output_width: NSUInteger)

Setter for outputWidth.

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pub unsafe fn outputHeight(&self) -> NSUInteger

The height of the output color texture for the spatial scaler you create with this descriptor.

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pub unsafe fn setOutputHeight(&self, output_height: NSUInteger)

Setter for outputHeight.

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pub unsafe fn colorProcessingMode( &self, ) -> MTLFXSpatialScalerColorProcessingMode

The color space of the input color texture for the spatial scaler you create with this descriptor.

This property’s default value is MTLFXSpatialScalerColorProcessingMode/MTLFXSpatialScalerColorProcessingModePerceptual.

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pub unsafe fn setColorProcessingMode( &self, color_processing_mode: MTLFXSpatialScalerColorProcessingMode, )

Setter for colorProcessingMode.

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pub unsafe fn newSpatialScalerWithDevice( &self, device: &ProtocolObject<dyn MTLDevice>, ) -> Option<Retained<ProtocolObject<dyn MTLFXSpatialScaler>>>

Creates a spatial scaler instance for a Metal device.

Parameters:
device: The Metal device that creates the spatial scaler.
Returns: A new spatial scaler instance upon success, or nil otherwise.

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pub unsafe fn newSpatialScalerWithDevice_compiler( &self, device: &ProtocolObject<dyn MTLDevice>, compiler: &ProtocolObject<dyn MTL4Compiler>, ) -> Option<Retained<ProtocolObject<dyn MTL4FXSpatialScaler>>>

Available on crate feature MTL4FXSpatialScaler only.

Creates a spatial scaler instance for a Metal device.

Parameters:
device: The Metal device that creates the spatial scaler.
compiler: A compiler instance this method can use to build pipeline state objects.
Returns: A new spatial scaler instance upon success, or nil otherwise.

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pub unsafe fn supportsMetal4FX(device: &ProtocolObject<dyn MTLDevice>) -> bool

Queries whether a Metal device supports spatial scaling compatible with Metal 4.

Parameters:
device: The GPU device for which this methods tests support.
Returns: <doc ://com.apple.documentation/documentation/swift/true> if the device supports spatial scaling with Metal 4, <doc ://com.apple.documentation/documentation/swift/false> otherwise.

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pub unsafe fn supportsDevice(device: &ProtocolObject<dyn MTLDevice>) -> bool

Returns a Boolean value that indicates whether the spatial scaler works with a GPU.

Parameters:
device: An MTLDevice instance that represents a GPU.
Returns: <doc ://com.apple.documentation/documentation/swift/true> if the device supports spatial scaling, <doc ://com.apple.documentation/documentation/swift/false> otherwise.

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impl MTLFXSpatialScalerDescriptor

Methods declared on superclass NSObject.

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pub unsafe fn init(this: Allocated<Self>) -> Retained<Self>

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pub unsafe fn new() -> Retained<Self>

Methods from Deref<Target = NSObject>§

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pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>§

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pub fn class(&self) -> &'static AnyClass

Dynamically find the class of this object.

§Panics

May panic if the object is invalid (which may be the case for objects returned from unavailable init/new methods).

§Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

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pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

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pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}