54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
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use crate::libretro_sys_new::*;
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pub fn bytes_per_pixel_from_libretro(pf: PixelFormat) -> u32 {
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match pf {
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PixelFormat::ARGB1555 | PixelFormat::RGB565 => 2,
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PixelFormat::ARGB8888 => 4,
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}
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}
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/// Boilerplate code for dealing with NULL/otherwise terminated arrays,
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/// which converts them into a Rust slice.
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///
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/// We rely on a user-provided callback currently to determine when iteration is complete.
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/// This *could* be replaced with a object-safe trait (and a constraint to allow us to use said trait) to codify
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/// the expected "end conditions" of a terminated array of a given type, but for now, the callback works.
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pub fn terminated_array<'a, T>(ptr: *const T, end_fn: impl Fn(&T) -> bool) -> &'a [T] {
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// Make sure the array pointer itself isn't null. Strictly speaking, this check should be done
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// *before* this is called by the user, but to avoid anything going haywire
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// we additionally check here.
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assert!(!ptr.is_null(), "pointer to array given to terminated_array! cannot be null");
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unsafe {
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let mut iter = ptr.clone();
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let mut len: usize = 0;
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loop {
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let item = iter.as_ref().unwrap();
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if end_fn(item) {
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break;
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}
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len += 1;
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iter = iter.add(1);
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}
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std::slice::from_raw_parts(ptr, len)
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}
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}
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/*
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#[doc(hidden)]
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#[macro_export]
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macro_rules! __terminated_array {
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($pex:ident, $lex:expr $(,)?) => {
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$crate::util::__terminated_array_impl($pex, $lex)
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};
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}
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#[doc(inline)]
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pub use __terminated_array as terminated_array;
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*/
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