41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
use std::marker::PhantomData;
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use std::ptr::NonNull;
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use vapoursynth_sys as ffi;
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use api::API;
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/// A frame context used in filters.
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#[derive(Debug, Clone, Copy)]
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pub struct FrameContext<'a> {
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handle: NonNull<ffi::VSFrameContext>,
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_owner: PhantomData<&'a ()>,
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}
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impl<'a> FrameContext<'a> {
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/// Wraps `handle` in a `FrameContext`.
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///
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/// # Safety
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/// The caller must ensure `handle` is valid and API is cached.
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#[inline]
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pub(crate) unsafe fn from_ptr(handle: *mut ffi::VSFrameContext) -> Self {
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Self {
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handle: NonNull::new_unchecked(handle),
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_owner: PhantomData,
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}
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}
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/// Returns the underlying pointer.
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#[inline]
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pub(crate) fn ptr(self) -> *mut ffi::VSFrameContext {
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self.handle.as_ptr()
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}
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/// Returns the index of the node from which the frame is being requested.
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#[inline]
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pub fn output_index(self) -> usize {
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let index = unsafe { API::get_cached().get_output_index(self.handle.as_ptr()) };
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debug_assert!(index >= 0);
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index as _
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}
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}
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