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[XProf: trace viewer] Add Live Trace Viewer MVP with streaming controls #3791

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Merged
copybara-service merged 1 commit into from
Oct 10, 2026
Merged

[XProf: trace viewer] Add Live Trace Viewer MVP with streaming controls #3791

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9 changes: 9 additions & 0 deletions frontend/app/components/trace_viewer_v2/application.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,14 @@ EMSCRIPTEN_KEEPALIVE emscripten::val GetPresetPalettes() {
return result;
}

// Sets the visible time range of the timeline. `start_us` and `end_us` are in
// microseconds. This is primarily used by the Live Trace Viewer to auto-follow
// the newest sliding window as new streaming data arrives.
EMSCRIPTEN_KEEPALIVE void SetVisibleRange(double start_us, double end_us) {
Application::Instance().timeline().SetVisibleRange({start_us, end_us});
Application::Instance().RequestRedraw();
}

EMSCRIPTEN_BINDINGS(traceviewer) {
emscripten::function("SetPalette", &SetPalette);
emscripten::function("SetColor", &SetColor);
Expand All @@ -194,6 +202,7 @@ EMSCRIPTEN_BINDINGS(traceviewer) {
emscripten::function("RequestRedraw", &RequestRedraw);
emscripten::function("SetPlaybackState", &SetPlaybackState);
emscripten::function("GetPresetPalettes", &GetPresetPalettes);
emscripten::function("setVisibleRange", &SetVisibleRange);
}

EMSCRIPTEN_BINDINGS(colors) {
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5 changes: 5 additions & 0 deletions frontend/app/components/trace_viewer_v2/main.ts
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Expand Up @@ -176,6 +176,11 @@ declare global {
* off. Hover highlighting, hover events and selection are unaffected.
*/
SetEventTooltipEnabled?(enabled: boolean): void;
// Sets the visible time range of the timeline. Both arguments are in
// microseconds. Registered as a module-level Emscripten function (see
// `SetVisibleRange` in application.cc). Used by the Live Trace Viewer to
// auto-follow the newest sliding window as streaming data arrives.
setVisibleRange(startUs: number, endUs: number): void;
canvas: HTMLCanvasElement;
callMain(args: string[]): void;
preinitializedWebGPUDevice: GPUDevice | null;
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