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renderer: Add a way to query the buffer *type*

This commit is contained in:
Victor Brekenfeld 2021-06-04 19:39:18 +02:00 committed by Victor Berger
parent 327321612d
commit 2661b86019
1 changed files with 58 additions and 4 deletions
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60
src/backend/renderer/mod.rs
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@ -254,7 +254,6 @@ pub trait Renderer {
/// This function *may* error, if:
/// - The given dimensions are unsuppored (too large) for this renderer
/// - The given Transformation is not supported by the renderer (`Transform::Normal` is always supported).
/// - There was a previous `begin`-call, which was not terminated by `finish`.
/// - This renderer implements `Bind`, no target was bound *and* has no default target.
/// - (Renderers not implementing `Bind` always have a default target.)
fn render<F, R>(
@ -268,8 +267,61 @@ pub trait Renderer {
F: FnOnce(&mut Self, &mut Self::Frame) -> R;
}
#[cfg(feature = "wayland_frontend")]
#[non_exhaustive]
/// Buffer type of a given wl_buffer, if managed by smithay
pub enum BufferType {
/// Buffer is managed by the [`crate::wayland::shm`] global
Shm,
#[cfg(all(feature = "backend_egl", feature = "use_system_lib"))]
/// Buffer is managed by a currently initialized [`crate::backend::egl::display::EGLBufferReader`]
Egl,
/// Buffer is managed by the [`crate::wayland::dmabuf`] global
Dma,
}
/// Returns the *type* of a wl_buffer
///
/// Returns `None` if the type is not known to smithay
/// or otherwise not supported (e.g. not initialized using one of smithays [`crate::wayland`]-handlers).
#[cfg(all(feature = "wayland_frontend", feature = "backend_egl", feature = "use_system_lib"))]
pub fn buffer_type(
buffer: &wl_buffer::WlBuffer,
egl_buffer_reader: Option<&EGLBufferReader>,
) -> Option<BufferType> {
if egl_buffer_reader
.as_ref()
.and_then(|x| x.egl_buffer_dimensions(&buffer))
.is_some()
{
Some(BufferType::Egl)
} else if crate::wayland::shm::with_buffer_contents(&buffer, |_, _| ()).is_ok()
{
Some(BufferType::Shm)
} else {
None
}
}
/// Returns the *type* of a wl_buffer
///
/// Returns `None` if the type is not recognized by smithay or otherwise not supported.
#[cfg(all(feature = "wayland_frontend", not(feature = "backend_egl"), not(feature = "use_system_lib")))]
pub fn buffer_type(buffer: &wl_buffer::WlBuffer) -> Option<BufferType> {
use crate::backend::allocator::Buffer;
if crate::wayland::shm::with_buffer_contents(&buffer, |_, _| ()).is_ok()
{
Some(BufferType::Shm)
} else {
None
}
}
/// Returns the dimensions of a wl_buffer
#[cfg(all(feature = "wayland_frontend", feature = "backend_egl"))]
///
/// *Note*: This will only return dimensions for buffer types known to smithay (see [`buffer_type`])
#[cfg(all(feature = "wayland_frontend", feature = "backend_egl", feature = "use_system_lib"))]
pub fn buffer_dimensions(
buffer: &wl_buffer::WlBuffer,
egl_buffer_reader: Option<&EGLBufferReader>,
@ -289,7 +341,9 @@ pub fn buffer_dimensions(
}
/// Returns the dimensions of a wl_buffer
#[cfg(all(feature = "wayland_frontend", not(feature = "backend_egl")))]
///
/// *Note*: This will only return dimensions for buffer types known to smithay (see [`buffer_type`])
#[cfg(all(feature = "wayland_frontend", not(feature = "backend_egl"), not(feature = "use_system_lib")))]
pub fn buffer_dimensions(buffer: &wl_buffer::WlBuffer) -> Option<(i32, i32)> {
use crate::backend::allocator::Buffer;