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screencopy: Fix damage tracking bug with shm screencopy of output

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Similar to the change in https://github.com/pop-os/cosmic-comp/pull/780,
but also updates it to be a little clearer than just an uncommented `age
= 0` line.

Ideally we want some robust system to re-use the offscreen buffer (but
not allocate more buffers indefinitely if the client doesn't capture
with the same `wl_buffer`).
This commit is contained in:
Ian Douglas Scott 2025-07-03 13:41:40 -07:00 • committed by Victoria Brekenfeld
parent e5fbf21fee
commit 8ef6c161a0
2 changed files with 15 additions and 6 deletions
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11
src/backend/kms/surface/mod.rs
View file

@ -39,7 +39,7 @@ use smithay::{
},
egl::EGLContext,
renderer::{
buffer_dimensions,
buffer_dimensions, buffer_type,
damage::Error as RenderError,
element::{
texture::TextureRenderElement,
@ -56,7 +56,7 @@ use smithay::{
multigpu::{ApiDevice, Error as MultiError, GpuManager},
sync::SyncPoint,
utils::with_renderer_surface_state,
Bind, Blit, Frame, ImportDma, Offscreen, Renderer, RendererSuper, Texture,
Bind, Blit, BufferType, Frame, ImportDma, Offscreen, Renderer, RendererSuper, Texture,
TextureFilter,
},
},
@ -1617,7 +1617,12 @@ fn take_screencopy_frames(
};
let buffer = frame.buffer();
let age = damage_tracking.age_for_buffer(&buffer);
let age = if matches!(buffer_type(&frame.buffer()), Some(BufferType::Shm)) {
// TODO re-use offscreen buffer to damage track screencopy to shm
0
} else {
damage_tracking.age_for_buffer(&buffer)
};
let res = damage_tracking.dt.damage_output(age, &elements);
if let Some(old_len) = old_len {