Struct RenderImageCallback 

#[repr(C)]
pub struct RenderImageCallback {
    pub cb: RenderImageCallbackType,
    pub ctx: OptionRefAny,
}

Callback that returns a rendered OpenGL texture

IMPORTANT: In azul-core, this is stored as CoreRenderImageCallback with a cb: usize field. When creating callbacks in the data model, function pointers are cast to usize. This type is used in azul-layout where we can safely work with the actual function pointer type.

Fields

cb: RenderImageCallbackType

ctx: OptionRefAny

For FFI: stores the foreign callable (e.g., PyFunction) Native Rust code sets this to None

Implementations

impl RenderImageCallback

pub fn create(cb: RenderImageCallbackType) -> Self

Create a new callback with just a function pointer (for native Rust code)

pub fn from_core(core_callback: &CoreRenderImageCallback) -> Self

Convert from the core crate’s CoreRenderImageCallback (which stores cb as usize) back to the layout crate’s typed function pointer.

Safety

This is safe because we ensure that the usize in CoreRenderImageCallback was originally created from a valid RenderImageCallbackType function pointer.

pub fn to_core(self) -> CoreRenderImageCallback

Convert to CoreRenderImageCallback (function pointer stored as usize)

This is always safe - we’re just casting the function pointer to usize for storage.

Trait Implementations

impl Clone for RenderImageCallback

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RenderImageCallback

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for RenderImageCallback

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<RenderImageCallback> for CoreRenderImageCallback

Allow RenderImageCallback to be passed to functions expecting C: Into<CoreRenderImageCallback>

fn from(callback: RenderImageCallback) -> Self

Converts to this type from the input type.

impl From<extern "C" fn(RefAny, RenderImageCallbackInfo) -> ImageRef> for RenderImageCallback

Allow creating callback from a raw function pointer Sets callable to None (for native Rust/C usage)

fn from(cb: RenderImageCallbackType) -> Self

Converts to this type from the input type.

impl Hash for RenderImageCallback

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for RenderImageCallback

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for RenderImageCallback

fn eq(&self, rhs: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for RenderImageCallback

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for RenderImageCallback