FComposableCameraLogCapture

#include <ComposableCameraLogCapture.h>

Inherits: FOutputDevice

Output device that watches GLog for warnings and errors emitted on any LogComposableCamera* log category and keeps the most recent N in a ring buffer for the debug panel's Warnings region to display.

Why this is needed: several non-fatal error paths in the runtime (running-camera null, referenced-director destroyed mid-blend, spline transition missing its rail actor, etc.) emit UE_LOG(..., Error, ...) but are only visible in Output Log. Users running PIE without Output Log open would miss them entirely. Mirroring them into the panel surfaces the signal in the same place the rest of the debug state lives.

Thread safety: Serialize is called from whichever thread did the UE_LOG. The ring buffer is guarded by a CriticalSection, so the panel's game-thread read and any worker-thread write serialize cleanly. Capacity is small (16) so the critical section is never held long enough to matter.

Compiled out in shipping builds — both Install/Uninstall and the accessor are #if !UE_BUILD_SHIPPING, so shipping games pay zero cost (no output device registered, no ring buffer memory, no lock).

Public Methods¶

Return	Name	Description
`void`	`Serialize` `virtual`
`bool`	`CanBeUsedOnAnyThread` `virtual` `const` `inline`
`bool`	`CanBeUsedOnMultipleThreads` `virtual` `const` `inline`

Serialize¶

virtual

virtual void Serialize(const TCHAR * V, ELogVerbosity::Type Verbosity, const FName & Category)

CanBeUsedOnAnyThread¶

virtual const inline

virtual inline bool CanBeUsedOnAnyThread() const

CanBeUsedOnMultipleThreads¶

virtual const inline

virtual inline bool CanBeUsedOnMultipleThreads() const

Public Static Attributes¶

Return	Name	Description
`constexpr int32`	`MaxCapturedEntries` `static`	Max entries the ring buffer keeps. Older entries overflow off the front. Exposed so the panel's height pass can reserve rows up front.

MaxCapturedEntries¶

static

constexpr int32 MaxCapturedEntries = 16

Max entries the ring buffer keeps. Older entries overflow off the front. Exposed so the panel's height pass can reserve rows up front.

Public Static Methods¶

Return	Name	Description
`void`	`Install` `static`	Register with `GLog`. Idempotent — calling twice is a no-op.
`void`	`Uninstall` `static`	Unregister from `GLog` and clear the ring buffer. Idempotent.
`void`	`GetRecentEntries` `static`	Copy the current ring-buffer contents into `OutEntries`, oldest first. Safe to call from any thread; blocks briefly on the ring-buffer critical section but never for more than a few μs.

Install¶

static

static void Install()

Uninstall¶

static

static void Uninstall()

Unregister from GLog and clear the ring buffer. Idempotent.

GetRecentEntries¶

static

static void GetRecentEntries(TArray< FComposableCameraLogEntry > & OutEntries)

Copy the current ring-buffer contents into OutEntries, oldest first. Safe to call from any thread; blocks briefly on the ring-buffer critical section but never for more than a few μs.

Private Attributes¶

Return	Name	Description
`TArray< FComposableCameraLogEntry >`	`RingBuffer`
`FCriticalSection`	`BufferCS`
`bool`	`bInstalled`

RingBuffer¶

TArray< FComposableCameraLogEntry > RingBuffer

BufferCS¶

FCriticalSection BufferCS

bInstalled¶

bool bInstalled = false

Private Static Methods¶

Return	Name	Description
`FComposableCameraLogCapture &`	`Get` `static`	Returns the shared singleton instance — keyed off static local so the first call installs and lifetime ends with module shutdown. Not exposed publicly: everything users want goes through the static Install / Uninstall / GetRecentEntries surface above.

Get¶

static

static FComposableCameraLogCapture & Get()

Returns the shared singleton instance — keyed off static local so the first call installs and lifetime ends with module shutdown. Not exposed publicly: everything users want goes through the static Install / Uninstall / GetRecentEntries surface above.