subagent transcript

session 17f09f89 · workflow wf_2d2ac42d
← 17f09f89 · archive
delegated task
CONTEXT — FreeCAD is ported to WebAssembly (emscripten 4.0.12, clang-22, JSPI, native wasm-EH). 3D rendering is Coin3D (Open Inventor) via Quarter, re
▸ Magik
CONTEXT — FreeCAD is ported to WebAssembly (emscripten 4.0.12, clang-22, JSPI, native wasm-EH). 3D rendering is Coin3D (Open Inventor) via Quarter, rendered to an OFFSCREEN FBO then blitted into a Qt widget via QPainter (Qt-for-wasm has NO native GL widget compositing — the whole Qt UI is a SOFTWARE raster surface blitted to an HTML canvas). WebGL2 via emscripten (FULL_ES3, LEGACY_GL_EMULATION off but Coin uses a GLES2 path). COIN_VBO=0 (client vertex arrays), COIN_VERTEX_ARRAYS=1 (VA fast path default-on for indexed face/line sets). qtFontDpi=80. KEY SOURCE LOCATIONS (find others yourself with grep/find): - FreeCAD 3D viewer + FBO->QPainter blit: /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/View3DInventorViewer.cpp (also SoQtQuarterAdaptor / Quarter / SoFCVectorizeAction). The wasm viewport work is documented — grep for __EMSCRIPTEN__ / FC_OS_WASM / grabFramebuffer / QOpenGLFramebufferObject / drawImage / readPixels in src/Gui. - Coin3D source: locate it (find / -name SoAsciiText.cpp -o -name so_glglue.c 2>/dev/null; try /home/magik6k/lcad-wasm/freecad-artifacts, pyside-port/build/pivy-coin, /opt/toolchains). The GLES2/immediate path is in src/rendering/ (SoGL*.cpp) + src/glue/gl.cpp (cc_glglue). SoAsciiText is src/nodes/SoAsciiText.cpp. - Emscripten GL emulation (the ffVertex/ffNormal3/ffSyncContext/emitImm JS functions seen in the profile are emscripten's FIXED-FUNCTION immediate-mode GLES2 emulation): /opt/toolchains/emsdk/upstream/emscripten/src/ (library_webgl.js / library_glemu.js / lib/libglemu / GLImmediate). Confirm where ff*/emitImm come from. - Qt raster paint (RGBA64 conversions): /opt/toolchains/qtsrc/qtbase/src/gui/painting/qdrawhelper.cpp (storeRGBA8888FromRGBA64PM / fetchRGBA8888ToRGBA64PM / comp_func_SourceOver_rgb64). Qt-wasm backingstore: /opt/toolchains/qtsrc/qtbase/src/plugins/platforms/wasm/qwasmbackingstore.cpp / qwasmwindow.cpp / qwasmscreen.cpp. - The relink/build to test a fix: cmake build at /opt/toolchains/src/freecad-gui-build; relink via /tmp/claude-1000/.../scratchpad/femrelink-s2.sh (this session's scratchpad). Do NOT run builds — analysis only. THE PROFILE (bottom-up, self-time, ~10s capture during hover/pointer interaction at 3-4 fps): Qt SOFTWARE COMPOSITING (~2.3s total): storeRGBA8888FromRGBA64PM 363ms, fetchRGBA8888ToRGBA64PM 250ms, comp_func_SourceOver_rgb64 104ms, fetchTransformed64<TextureBlendType 2> 224ms, qt_rectfill_nonpremul_rgba 132ms, blend_color_generic 147ms, QSvgNode::draw 1092ms(total) / QSvgG::drawCommand 1087ms / QSvgStrokeStyle::apply / QStroker::processCurrentSubpath 124ms, gray_raster_render 247ms, readPixels 113ms, texSubImage2D 83ms, do_mirror 33ms, QImage::copy 66ms. 3D SCENE (Coin, ~1.7s): SoAsciiText::GLRender 314+40ms + SoAsciiTextP::setUpGlyphs + cc_glyph3d_ref + cc_flw_get_vector_advance, immediate-mode glue ffVertex 268ms + ffNormal3 40ms + ffSyncContext 86ms + emitImm + glVertex3f/glVertex3fv, getParameter 390ms + getError 42ms (redundant GL state queries via wasm->JS->WebGL), bufferData 465ms (client-array re-upload every draw?), sogl_render_sphere 130ms + SoSphere::GLRender, SoSeparator::GLRenderBelowPath 1335ms(total) / SoAction::traverse 1562ms(total) / SoSeparator::cullTest 51ms. TIMERS: setTimeout 382ms + clearTimeout 137ms. Event: pointerenter 635ms self / 2730ms total. You have Read/Grep/Glob/Bash (read-only: grep/find/nm ok; do NOT edit files or run builds). Return ONLY the requested structured fields. Be concrete: cite file:line, the exact mechanism, and a SPECIFIC code-level fix (what to change), with an impact estimate (ms saved / % of frame) and effort. LANE: Over-rendering / redraw trigger. Event: pointerenter 635ms self / 2730ms total; Timer fired 472ms; setTimeout 382ms. Investigate: is FreeCAD redrawing the full 3D scene (and forcing a full Qt repaint) on every pointer MOVE/ENTER even when nothing changed (no camera move, no selection change)? - Trace the wasm event path: pointerenter/mousemove -> Qt -> QuarterWidget/View3DInventorViewer -> SoHandleEventAction -> does it schedule a redraw (SoSceneManager::scheduleRedraw / QuarterWidget::update) unconditionally? Highlight-on-hover (preselection) legitimately redraws, but does a bare pointerenter with no highlight also redraw? - setTimeout/clearTimeout churn: the wasm event loop / QWasmTimer scheduling a render timer per event. Is there a redraw coalescing (one render per animation frame) or does each event post a new render? Could renders be throttled to requestAnimationFrame / coalesced? - Preselection highlight: when hovering geometry, Coin re-renders to highlight. Is the highlight a full-scene re-render or can it use a cheaper overlay/second-pass? Propose: coalesce/throttle redraws to one-per-frame; skip redraw on no-op pointer events; cheaper preselection. Estimate ms.
Fable
thinking
I'm tracing through the redraw trigger mechanism to understand how it works, starting with the key files involved.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && grep -rn \"scheduleRedraw\\|QuarterWidget::update\\|redraw()\" --include=*.cpp --include=*.h | head -50", "description": "Find redraw scheduling calls"}
tool result
(eval):1: no matches found: --include=*.cpp
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "find / -path '*Quarter*QuarterWidget.cpp' 2>/dev/null; find / -name \"SoQtQuarterAdaptor*\" 2>/dev/null | head; find / -name \"SoSceneManager.cpp\" 2>/dev/null | head", "description": "Locate Quarter source"}
tool result
/home/magik6k/lcad-wasm/freecad-artifacts.bad/opt-toolchains/src/freecad-gui-build/src/Gui/Quarter/moc_QuarterWidget.cpp
/opt/toolchains/src/freecad-gui-build/src/Gui/Quarter/moc_QuarterWidget.cpp
/home/magik6k/lcad-wasm/freecad-artifacts/opt-toolchains/src/freecad-gui-build/src/Gui/Quarter/moc_QuarterWidget.cpp
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter/QuarterWidget.cpp
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/coin/src/misc/SoSceneManager.cpp
zshexit:1: param  …[truncated]
Fable
thinking
I found the Coin3D source code in FreeCAD's tree and I'm now tracing through the event and redraw mechanism to understand how it works.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && grep -rn \"scheduleRedraw\\|actualRedraw\\|update()\\|renderCB\\|redraw\" QuarterWidget.cpp SoQtQuarterAdaptor.cpp 2>/dev/null | head -60", "description": "Find redraw …
tool result
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && grep -rln \"SoHandleEventAction\\|processEvent\\|mouseMoveEvent\\|pointerenter\" Quarter/ View3DInventorViewer.cpp 2>/dev/null", "description": "Find event handling fil…
tool result
Quarter/Mouse.cpp
Quarter/FocusHandler.cpp
Quarter/SoQTQuarterAdaptor.cpp
Quarter/QuarterWidget.cpp
View3DInventorViewer.cpp
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter && grep -n \"scheduleRedraw\\|actualRedraw\\|update\\|redraw\\|processEvent\\|paintEvent\\|paintGL\\|renderScene\" QuarterWidget.cpp | head -60", "description": "g…
tool result
210:    // paintGL() is invoked when e.g. using the method grabFramebuffer of this class
218:    void paintGL() override
222:            qw->redraw();
250:        update(); // force update when changing window mode
254:        update(); // fixes flickering on some systems
434:  redraw. This is on by default.
549:  PRIVATE(this)->sorendermanager->scheduleRedraw();
577:  PRIVATE(this)->sorendermanager->scheduleRedraw();
604:  PRIVATE(this)->sorendermanager->scheduleRedraw();
626:the widget is loca  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter/QuarterWidget.cpp", "offset": 1040, "limit": 120}
tool result
1040	
1041	/*!
1042	  Overridden from QGLWidget to render the scenegraph
1043	 */
1044	void
1045	QuarterWidget::actualRedraw()
1046	{
1047	  ZoneScoped;
1048	#ifdef __EMSCRIPTEN__
1049	  // Ensure emscripten's current-context global (GLctx) matches the context Qt
1050	  // made current, so Coin's glGetString/glGetError and our GL emulation act on
1051	  // a valid WebGL2 context. See Gui/WasmGLFixedFunc.cpp.
1052	  fcWasmSyncGLContext();
1053	#endif
1054	  PRIVATE(this)->sorendermanager->render(  …[truncated]
Fable
thinking
I'm examining how events propagate through the system, particularly looking at the event handler method and how mouse interactions trigger redraws around that section of the code.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter/QuarterWidget.cpp", "offset": 760, "limit": 130}
tool result
760	  if (carrydata) {
761	    PRIVATE(this)->soeventmanager->setSceneGraph(scene);
762	    PRIVATE(this)->soeventmanager->setCamera(camera);
763	    PRIVATE(this)->soeventmanager->setViewportRegion(vp);
764	  }
765	
766	  if (scene) scene->unref();
767	  if (camera) camera->unref();
768	}
769	
770	/*!
771	  Returns a pointer to the event manager
772	*/
773	SoEventManager *
774	QuarterWidget::getSoEventManager() const
775	{
776	  return PRIVATE(this)->soeventmanager;
777	}
778	
779	/*!
780	  Ret  …[truncated]
Fable
thinking
I'm tracing through the event handling path to understand whether a mousemove or pointerenter event without any preselection triggers a redraw. I need to examine how SoHandleEventAction processes these events in View3DInventorViewer and how preselection interacts with the redraw scheduling, particularly looking at the event filter mechanism and SoFCUnifiedSelection's role in this flow.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && grep -rn \"scheduleRedraw\\|redraw\\|setPreselect\\|highlight\\|SoHandleEventAction\\|handleEvent\" SoFCUnifiedSelection.cpp 2>/dev/null | head -50", "description": "gr…
tool result
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && ls SoFCUnifiedSelection* View3DInventor* 2>/dev/null; echo \"---\"; grep -c \"\" SoFCUnifiedSelection.cpp 2>/dev/null", "description": "list selection files"}
tool result
Exit code 2
(eval):1: no matches found: SoFCUnifiedSelection*
---
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && find . -name \"SoFCUnifiedSelection*\"; echo \"===\"; grep -rln \"setPreselection\\|Preselect\" . 2>/dev/null | head", "description": "find selection sources"}
tool result
./Selection/SoFCUnifiedSelection.h
./Selection/SoFCUnifiedSelection.cpp
===
FileDialogWin32.cpp
FreeCADGui.Selection.module.pyi
OverlayManager.cpp
TaskElementColors.cpp
SoFCDB.cpp
View3DSettings.cpp
Tree.cpp
TaskTransform.cpp
ViewProviderPlane.cpp
StatusBarLabel.h
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Selection && grep -n \"handleEvent\\|Preselect\\|redraw\\|touch()\\|SoLocation2Event\\|highlight\\|SoFullPath\" SoFCUnifiedSelection.cpp | head -60", "description": "grep …
tool result
26:#include <Inventor/SoFullPath.h>
29:#include "SoFullPathHelper.h"
51:#include <Inventor/events/SoLocation2Event.h>
102:void printPreselectionInfo(
113:SoFullPath* Gui::SoFCUnifiedSelection::currentHighlightPath = nullptr;
193:    SO_NODE_ADD_FIELD(colorHighlight, (SelectionColors::highlightFallbackColor()));
200:    SO_NODE_DEFINE_ENUM_VALUE(PreselectionModes, AUTO);
201:    SO_NODE_DEFINE_ENUM_VALUE(PreselectionModes, ON);
202:    SO_NODE_DEFINE_ENUM_VALUE(PreselectionModes, OFF);
2  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Selection/SoFCUnifiedSelection.cpp", "offset": 1036, "limit": 120}
tool result
1036	void SoFCUnifiedSelection::handleEvent(SoHandleEventAction* action)
1037	{
1038	    // If off then don't handle this event
1039	    if (!selectionEnabled.getValue()) {
1040	        inherited::handleEvent(action);
1041	        return;
1042	    }
1043	
1044	    auto preselectionMode = static_cast<SelectionModes>(this->preselectionMode.getValue());
1045	    const SoEvent* event = action->getEvent();
1046	
1047	    //
1048	    // If this is a mouseMotion event, then check for preselected entiti  …[truncated]
Fable
thinking
I'm seeing that every mouse motion triggers a full ray-pick traversal through the scene, and `setPreselect` calls `touch()` which marks the node as modified and schedules a redraw. The critical question is whether `touch()` fires even when the preselected element hasn't actually changed, so I need to examine the `setPreselect` implementation to understand this behavior.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Selection/SoFCUnifiedSelection.cpp", "offset": 739, "limit": 65}
tool result
739	bool SoFCUnifiedSelection::setPreselect(
740	    SoFullPath* path,
741	    const SoDetail* det,
742	    ViewProviderDocumentObject* vpd,
743	    const char* element,
744	    float x,
745	    float y,
746	    float z
747	)
748	{
749	    Base::FlagToggler<SbBool> flag(setPreSelection);
750	
751	    bool highlighted = false;
752	    if (path && path->getLength() && vpd && vpd->getObject()
753	        && vpd->getObject()->isAttachedToDocument()) {
754	        const char* docname = vpd->getObject  …[truncated]
Fable
thinking
I'm checking whether `setPreselect` returns 0 when hovering over the same element repeatedly, which would indicate no change and avoid unnecessary touch events. The key logic is in lines 790-801 where if `currentHighlightPath` is already set, we need to handle the existing highlight appropriately.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Selection && grep -n \"int SelectionSingleton::setPreselect\\|::setPreselect\" Selection.cpp | head", "description": "find setPreselect in Selection.cpp"}
tool result
907:int SelectionSingleton::setPreselect(
1108:void SelectionSingleton::setPreselectCoord(float x, float y, float z)
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Selection/Selection.cpp", "offset": 907, "limit": 120}
tool result
907	int SelectionSingleton::setPreselect(
908	    const char* pDocName,
909	    const char* pObjectName,
910	    const char* pSubName,
911	    float x,
912	    float y,
913	    float z,
914	    SelectionChanges::MsgSource signal,
915	    SelectionChanges::PickedPoint pickedPoint
916	)
917	{
918	    if (!pDocName || !pObjectName) {
919	        rmvPreselect();  // Invalid request
920	        return 0;
921	    }
922	
923	    if (!pSubName) {
924	        pSubName = "";
925	    }
926	
927	    if (Doc  …[truncated]
Fable
thinking
I'm tracing through the preselection logic—when hovering over the same element, the comparison at line 927-929 returns -1 to indicate it's already preselected, which causes an early return at line 772 without triggering a redraw. So the preselection guard is working correctly and only redraws when the element actually changes. But the profiler is still showing significant overhead somewhere.

Looking at the pointerenter event, it's spending 635ms in Qt-side event handling and 2730ms total, which includes the full ray pick traversal even over empty space. The real question is whether the scene is redrawing on every pointer move or if the redraw sensor is properly coalescing multiple events in  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/coin/src && find . -name \"SoRenderManager.cpp\" -o -name \"SoSceneManager.cpp\" | head; echo \"===\"; grep -rn \"scheduleRedraw\\|redrawshot\\|SoOneShotSensor\\|rend…
tool result
./misc/SoSceneManager.cpp
./rendering/SoRenderManager.cpp
===
misc/SoSceneManager.cpp:73:#include <Inventor/sensors/SoOneShotSensor.h>
misc/SoSceneManager.cpp:226:SoSceneManager::scheduleRedraw(void)
misc/SoSceneManager.cpp:228:  PRIVATE(this)->rendermanager->scheduleRedraw();
misc/SoSceneManager.cpp:499:  PRIVATE(this)->rendermanager->setRenderCallback(SoSceneManagerP::renderCB, PRIVATE(this));
misc/SoSceneManager.cpp:516:  Set up the redraw \a priority for the SoOneShotSensor used to
zshexit:1  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/coin/src/rendering && grep -n \"scheduleRedraw\\|redrawshot\\|SoOneShotSensor\\|redrawSensorCB\\|::render\\b\\|isActive\\|schedule()\" SoRenderManager.cpp | head -40"…
tool result
82:#include <Inventor/sensors/SoOneShotSensor.h>
284:  PRIVATE(this)->redrawshot =
285:    new SoOneShotSensor(SoRenderManagerP::redrawshotTriggeredCB, this);
286:  PRIVATE(this)->redrawshot->setPriority(PRIVATE(this)->redrawpri);
307:  delete PRIVATE(this)->redrawshot;
401:  ((SoRenderManager *)data)->scheduleRedraw();
453:  //  PRIVATE(this)->clipsensor->schedule();
466:  //  PRIVATE(this)->clipsensor->unschedule();
589:SoRenderManager::render(const SbBool clearwindow, const SbBool clearzbuffe  …[truncated]
Fable
thinking
So `scheduleRedraw` uses a `SoOneShotSensor` that coalesces multiple redraw requests into a single trigger on the delay queue, which then calls through to `renderCB` and ultimately `viewport()->update()` to fire the paint event. The real question is what's driving the Coin delay queue in the WebAssembly event loop.

Let me trace through how `redrawshotTriggeredCB` connects to Qt's event system and find where the `SoSensorManager` delay/timer queue gets pumped in the wasm environment — there's likely a `QuarterWidget` signal or timer mechanism orchestrating this.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/coin/src/rendering/SoRenderManager.cpp", "offset": 380, "limit": 30}
tool result
380	*/
381	SoCamera *
382	SoRenderManager::getCamera(void) const
383	{
384	  return PRIVATE(this)->camera;
385	}
386	
387	/*
388	  Internal callback
389	
390	  \param[in] data Pointer to SoRenderManager
391	
392	  \deprecated Will be made private in a later version of Coin
393	*/
394	void
395	SoRenderManager::nodesensorCB(void * data, SoSensor * /* sensor */)
396	{
397	#if COIN_DEBUG && 0 // debug
398	  SoDebugError::postInfo("SoRenderManager::nodesensorCB",
399	                         "detecte  …[truncated]
Fable
thinking
I'm seeing a lot of setTimeout and clearTimeout churn in the profile—382ms and 137ms respectively—which suggests the Coin sensor's delay queue is being constantly rescheduled. I need to trace how Quarter's wasm event loop actually drives this timer mechanism, whether it's through SoSensorManager or a QTimer callback that keeps getting reset with each event.

Let me search through the FreeCAD GUI code to find where this sensor timer is actually being pumped.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && grep -rln \"SoSensorManager\\|SoDB::getSensorManager\\|processDelayQueue\\|processTimerQueue\\|setChangedCallback\\|QuarterWidget::event\\b\" Quarter/ | head; echo \"==…
tool result
Quarter/SensorManager.cpp
Quarter/QuarterWidget.cpp
===
Quarter/QuarterWidget.cpp:302:  PRIVATE(this)->processdelayqueue = true;
Quarter/QuarterWidget.cpp:901:    // We set the PRIVATE(this)->processdelayqueue = false in redraw()
Quarter/QuarterWidget.cpp:908:    if(PRIVATE(this)->processdelayqueue && SoDB::getSensorManager()->isDelaySensorPending()) {
Quarter/QuarterWidget.cpp:912:        SoDB::getSensorManager()->processDelayQueue(false);
Quarter/QuarterWidget.cpp:939:    PRIVATE(this)->proces  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter/SensorManager.cpp"}
tool result
1	/**************************************************************************\
2	 * Copyright (c) Kongsberg Oil & Gas Technologies AS
3	 * All rights reserved.
4	 * 
5	 * Redistribution and use in source and binary forms, with or without
6	 * modification, are permitted provided that the following conditions are
7	 * met:
8	 * 
9	 * Redistributions of source code must retain the above copyright notice,
10	 * this list of conditions and the following disclaimer.
11	 * 
12	 * Redistributions in bi  …[truncated]
Fable
thinking
I'm seeing the root cause of the setTimeout/clearTimeout churn on the wasm platform. The QTimer implementation relies on emscripten's setTimeout/clearTimeout, and every time the sensor queue changes—which happens constantly during touch events and redraws—it triggers sensorQueueChanged(), which repeatedly starts and stops the timer queue timer and spawns new setTimeout(0) calls for every pending delay sensor.

The real churn loop is that idleTimeout() and delayTimeout() call sensorQueueChanged() again at the end, which reschedules the timers, creating a cycle where each redraw triggers another timer start, which fires immediately due to the 0ms delay, which processes the queue and triggers a  …
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter/QuarterWidget.cpp", "offset": 886, "limit": 145}
tool result
886	    // On wasm CustomGLWidget derives from Gui::WasmGLWidget, not QOpenGLWidget,
887	    // but exposes the same isValid/makeCurrent/doneCurrent/context API.
888	    CustomGLWidget* w = static_cast<CustomGLWidget*>(this->viewport());
889	    if (!w->isValid()) {
890	        qWarning() << "No valid GL context found!";
891	        return;
892	    }
893	    //assert(w->isValid() && "No valid GL context found!");
894	    // We might have to process the delay queue here since we don't know
895	    …[truncated]
Fable
thinking
I'm tracing through the redraw callback chain — the shot trigger calls redraw, which invokes the render callback set to QuarterWidget's handler, and that ultimately calls viewport()->update() to refresh the display.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Quarter/QuarterWidget.cpp", "offset": 1030, "limit": 12}
tool result
1030	  // QuarterWidget. And if repaint() is called here, it will trigger another
1031	  // series call of QWidgetPrivate::paintSiblingRecursive(), and eventually
1032	  // back to the first QuarterWidget, at which time the "Recursive repaint
1033	  // detected" Qt warning message will be printed.
1034	  //
1035	  // Note that, the recursive repaint is not infinite due to setting
1036	  // 'processdelayqueue = false' above. However, it does cause annoying
1037	  // flickering, and actually crash  …[truncated]
Fable
thinking
So the redraw cycle starts with a mouse movement that triggers an event filter, which processes the event through a series of handlers including the unified selection system, ultimately performing a full ray pick to determine what's preselected.

When something changes, it calls touch() which schedules a redraw through a coalesced mechanism — the idle timer uses setTimeout(0) to batch updates, so typically one render per animation frame as the browser coalesces pointer events. But here's the core inefficiency: every preselection change triggers a complete Coin scene re-render of the entire viewport, including all geometry and text glyphs, followed by a full framebuffer readback and composite  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui && grep -rn \"scheduleRedraw\\|->update()\\|touch()\\|setRenderCache\\|redraw\" Navigation/NavigationStyle.cpp View3DInventorViewer.cpp Quarter/SoQTQuarterAdaptor.cpp 2>/d…
tool result
Navigation/NavigationStyle.cpp:2067:            viewer->getSoRenderManager()->scheduleRedraw();
Navigation/NavigationStyle.cpp:2318:    camera->touch();
View3DInventorViewer.cpp:997:        setRenderCache(-1);
View3DInventorViewer.cpp:1986:void View3DInventorViewer::setRenderCache(int mode)
View3DInventorViewer.cpp:2082:        rm->scheduleRedraw();
View3DInventorViewer.cpp:2731: * Sets the SoFCInteractiveElement to \a false and forces a redraw.
View3DInventorViewer.cpp:2739:    viewer->redraw()  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Gui/Navigation/NavigationStyle.cpp", "offset": 2050, "limit": 25}
tool result
2050	        case DRAGGING:
2051	            // Set up initial projection point for the projector object when
2052	            // first starting a drag operation.
2053	            animator->stop();
2054	            viewer->showRotationCenter(true);
2055	
2056	#if (COIN_MAJOR_VERSION * 100 + COIN_MINOR_VERSION * 10 + COIN_MICRO_VERSION < 403)
2057	            findBoundingSphere();
2058	#endif
2059	
2060	            this->spinprojector->project(this->lastmouseposition);
2061	            this->inte  …[truncated]
Fable
thinking
The passive hover redraw is only driven by preselection and properly gated, while the active redraw happens during SPINNING/DRAGGING when the button is held. I'm tracing through the pointerenter path to understand that 635ms self time — it's likely Qt-wasm's synchronous event dispatch running the entire handler chain (pick, preselect, render) synchronously under the pointerenter event, even though setTimeout is asynchronous.

Looking at the 2730ms total under pointerenter, that includes all nested work triggered synchronously by the event handler. The ray pick action traverses the whole scene and generates primitives for text and spheres, which is expensive. But the fact that rendering calls  …
Fable
I have enough to characterize the redraw-trigger path concretely. Let me capture the final analysis.
Fable
⚙ StructuredOutput {"lane": "Over-rendering / redraw trigger", "root_cause": "The passive-hover redraw path is: mousemove -> Qt -> QuarterWidget event filter -> SoHandleEventAction -> SoFCUnifiedSelection::handleEvent (SoFCUnifiedSelection.cpp:1036) -> getPic…
tool result
Output does not match required schema: root: must NOT have additional properties
Fable
⚙ StructuredOutput {"lane": "Over-rendering / redraw trigger", "root_cause": "Passive-hover redraw path: mousemove -> QuarterWidget event filter -> SoHandleEventAction -> SoFCUnifiedSelection::handleEvent (SoFCUnifiedSelection.cpp:1036) -> getPickedList (full…
tool result
Structured output provided successfully