feat(gpui): expose item offset and content height on ListState - #10
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughChangesThe pull request adds caller-owned external texture support across GPUI, WGPU, and DirectX. It updates surface content handling, adds buffered frame and dirty-region tracking, propagates opacity, and adds list height estimation for measured and unmeasured items. ChangesExternal textures and list measurement
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Producer
participant ExternalTextureBuffer
participant Window
participant Renderer
participant GPU
Producer->>ExternalTextureBuffer: submit frame and dirty regions
Window->>Renderer: paint external texture surface
Renderer->>ExternalTextureBuffer: with_frame
Renderer->>GPU: recreate or upload dirty regions
Renderer->>ExternalTextureBuffer: mark_uploaded_for on complete upload
Renderer->>GPU: draw external texture quad
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 61.96% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 92 functions across 9 files. (1 skipped: 1 unsupported.)
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All reported issues were addressed across 11 files
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Review follow-ups on the external texture primitive, all seven threads from the PR: - The visit no longer holds the producer's lock. `submit` publishes an immutable `Arc<ExternalFrame>` snapshot and `with_frame` clones it out before calling the visitor, so a Chromium paint callback never waits for a GPU upload. `a_visit_does_not_block_the_producer` fails against the previous implementation. - Acknowledgements are per renderer. `ExternalTextureConsumerId` plus a per-consumer table means the first window to draw a shared source can no longer discard dirty regions the second one still needs; `mark_uploaded_for` defaults to `mark_uploaded`, so a single-consumer source keeps the simpler contract. A cached texture retires its consumer on drop, so a closed window, a pruned cache or a recovered device cannot hold the dirty union forever. - `release_frame` drops the spare allocation as well: a hidden pane must not keep an 8 MB framebuffer alive, which is the point of the call. - `paint_external_texture` is documented as unavailable on macOS, records nothing there, warns once, and still runs the paint-phase debug assert. Metal keeps the CoreVideo surface path. - `PaintSurface` carries the element's opacity, and both external-texture backends feed it to their shader instead of hardcoding 1.0, so a pane inside a faded ancestor fades with it. - DirectX binds a dedicated CLAMP sampler for external textures; the shared sampler wraps, which bleeds the opposite edge into a page drawn at a size other than its texture. - Both backends skip a frame past the device's texture limit with a log and no acknowledgement, instead of creating an invalid texture (wgpu) or failing the whole window's frame (Direct3D). - `ListState::item_top_and_content_height` adds the list padding to both the item top and the content height, matching where `List` places the first item and the height it scrolls. The mirrored sequence counter is stored under the state lock so two producers cannot write it out of order, and the staging copy no longer memSets every byte it is about to overwrite.
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@crates/gpui/src/elements/list.rs`:
- Line 695: Replace the unresolved intra-doc link to ListState::scroll in the
nearby documentation comment with plain text describing the list scroll
handling, preserving the rest of the comment unchanged.
In `@crates/gpui/src/external_texture.rs`:
- Around line 507-525: Update release_frame so the state lock remains held while
resetting self.sequence and removing the frame via self.frame; move both
operations into the existing state critical section and remove their later
executions, preserving the existing spare and consumers cleanup.
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📒 Files selected for processing (10)
crates/gpui/src/elements/list.rscrates/gpui/src/external_texture.rscrates/gpui/src/gpui.rscrates/gpui/src/scene.rscrates/gpui/src/window.rscrates/gpui_macos/src/metal_renderer.rscrates/gpui_wgpu/src/shaders.wgslcrates/gpui_wgpu/src/wgpu_renderer.rscrates/gpui_windows/build.rscrates/gpui_windows/src/directx_renderer.rs
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All reported issues were addressed across 6 files (changes from recent commits).
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The eight threads from the second review round: - `release_frame` now holds the state lock while it clears the frame, the spare allocation, the consumer table and the mirrored sequence, so a producer cannot publish between those steps. `state` is taken first and is the only lock ever held while acquiring another, which is the invariant the comment now states. - A partial upload is never acknowledged. Both backends report an `ExternalTextureUpload` outcome; a region rejected by the bounds checks leaves the cache key untouched and the frame unacknowledged, so the producer keeps the dirt and a later frame retries it. Direct3D still draws the last complete texture instead of skipping the surface, and its buffer-span rejection now logs like the wgpu one. - Dirty regions are validated against the frame's own dimensions and the byte span is computed with checked arithmetic on both backends, rather than trusting the caller's clamping. - A frame with no pixels to copy reports `Reused`, not `Complete`: it is not an upload and must not reach the upload counter. - The macOS CoreVideo path consumes the element opacity now: the instance struct carries it, the vertex shader forwards it, and the fragment shader multiplies the alpha by it, matching both other backends. - `PaintSurface::opacity` documents that both surface paths consume it, and the `item_top_and_content_height` doc no longer links a private method (rustdoc flagged it).
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1 issue found across 7 files (changes from recent commits).
Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="crates/gpui_windows/src/directx_renderer.rs">
<violation number="1" location="crates/gpui_windows/src/directx_renderer.rs:125">
P3: The existing GPU-texture doc comment now attaches to `ExternalTextureUpload`, making its documentation misleading. Move that comment below the enum so it documents `CachedExternalTexture` only.</violation>
</file>
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| /// the GPU. Acknowledging a partial upload would let the producer drop dirty | ||
| /// regions whose pixels were never copied, and nothing would ever resend them. | ||
| #[derive(Copy, Clone, Debug, PartialEq, Eq)] | ||
| enum ExternalTextureUpload { |
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P3: The existing GPU-texture doc comment now attaches to ExternalTextureUpload, making its documentation misleading. Move that comment below the enum so it documents CachedExternalTexture only.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At crates/gpui_windows/src/directx_renderer.rs, line 125:
<comment>The existing GPU-texture doc comment now attaches to `ExternalTextureUpload`, making its documentation misleading. Move that comment below the enum so it documents `CachedExternalTexture` only.</comment>
<file context>
@@ -116,6 +116,25 @@ struct ExternalTextureInstance {
+/// the GPU. Acknowledging a partial upload would let the producer drop dirty
+/// regions whose pixels were never copied, and nothing would ever resend them.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+enum ExternalTextureUpload {
+ /// Nothing needed uploading: the cached texture already held this frame, or
+ /// the frame had no pixels to copy. Not an upload, so not acknowledged.
</file context>
2 participants
What
An unatlased external-texture primitive for GPUI, plus one small
ListStateaddition. It exists for Cherry Pick's embedded browser: a Chromium off-screen frame is a live 1080p BGRA buffer that must composite inside the swap chain at 60fps, and routing it through the sprite atlas would evict every icon and glyph on screen on the first frame.ExternalTextureSource/ExternalTextureBuffer: a producer (Chromium's paint callback) publishes frames; a renderer uploads only what changed and draws the cached texture. A page that has settled costs a draw call and no bandwidth (PERF-B04).paint_external_textureis documented as unavailable on macOS and records nothing there.Window::paint_external_textureandPaintSurface/SurfaceContentcarry the element's opacity through to both backends.ListState::item_top_and_content_heightreports an item's top and the content height, including list padding, treating unmeasured items as the mean known height.Threading and correctness
submitpublishes an immutableArcsnapshot andwith_frameclones it out, so a Chromium paint callback never waits for a GPU upload.a_visit_does_not_block_the_producerfails against a lock-holding implementation.ExternalTextureConsumerId), so the first window to draw a shared source cannot discard dirty regions the second one still needs. Dirty regions are the union since the oldest unacknowledged frame, and the list degrades to a full upload rather than growing without bound. A cached texture retires its consumer on drop, so a closed window, a pruned cache, or a recovered device cannot hold the union forever.release_framedrops the spare allocation so a hidden pane does not keep a framebuffer.Review
Two review passes, all fifteen threads answered and resolved.
eb92d59997: macOS no-op made explicit and loud, per-consumer acknowledgements (a shared source can no longer discard dirt the second window still needs), the producer lock removed from the visit, element opacity carried through, the Direct3D clamp sampler, the max-texture-size guard on both backends, and list padding initem_top_and_content_height. Two regressions are pinned by tests that fail against the code they replaced.458d821a99:release_frameholds the state lock across the whole operation (no interleaving with a producer), a partial upload is never acknowledged (both backends report an outcome; a rejected region leaves the cache key and the dirt alone for a retry), regions are validated against the frame's own dimensions with checked arithmetic, a frame with nothing to copy is not counted as an upload, and the macOS CoreVideo path consumes the element opacity through the shader. The rustdoc link that could not resolve is gone.Verification
cargo test -p gpui --lib215 ✓, including the external-texture suite (23) and the list testscargo clippy -p gpui -p gpui_wgpu -p gpui_macos -- -D warningsclean;cargo check -p gpui_wgpu -p gpui_macoscleangpui_windowscannot be cross-compiled on the author's machine — itspsmbuild script needs a Windows target), so the Direct3D changes are review-verified only. The fork's CI lanes are skipped on this PR.Summary by cubic
Adds an unatlased external texture primitive so the embedded browser's Chromium frames composite into the GPUI scene without evicting the sprite atlas, and exposes item offsets and content height on
ListState. macOS keeps its CoreVideo surface path; external textures are a no-op there.New Features
Window::paint_external_texturedraws caller-owned RGBA/BGRA frames from a dedicated GPU texture; the wgpu and DirectX renderers previously ignoredPaintSurfaceand now composite these frames.ExternalTextureBufferprovides double buffering, dirty-rect accumulation, and a generation that bumps on resize and forces a texture recreate; a settled page costs a draw call and zero bandwidth.ListState::item_top_and_content_heightreturns an item's top and the content height, treats unmeasured items as the mean known height, and mixes in the list padding to matchListState::scroll.PaintSurfacecarries element opacity so a pane inside a faded ancestor fades with it; the CoreVideo shader and both external-texture backends multiply the fragment alpha by it.Reusedinstead of an upload, and a partial upload is never acknowledged, so a rejected region keeps its dirt for a later retry. Frames past the device's texture limit are skipped with a log instead of failing the window.Migration
PaintSurfacenow carries aSurfaceContentenum instead of a CoreVideoimage_bufferfield; custom renderers that construct surfaces directly need to update.mark_uploadedfrom insidewith_framewithout taking the producer's lock, or the render thread deadlocks.Written for commit 458d821. Summary will update on new commits.
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