[idd] capture: copy software frames directly to IVSHMEM

Bypass cadence retention when the software render adapter is active.
Publish each available source frame immediately with one damage-aware
D3D copy into its final IVSHMEM resource.

Keep only one software copy in flight so newer frames are dropped
instead of queued behind stale work. Retain accumulated damage for the
next frame and skip static re-encodes when no image update is pending.

Use a row-major IVSHMEM texture when the shared heap supports it and
fall back to a direct IVSHMEM buffer copy otherwise. In indirect mode,
copy only damaged rows from readback memory into IVSHMEM.

idd/LGIdd/CSwapChainProcessor.h

@@ -106,8 +106,9 @@ private:
   // Capture holds this only across submission; the publisher uses it to
   // close the gate before recording deadline work.
   SRWLOCK             m_copySubmitLock      = SRWLOCK_INIT;
-  uint64_t            m_candidateSequence   = 0;
-  bool                m_publishPending      = false;
+  uint64_t            m_candidateSequence     = 0;
+  bool                m_publishPending        = false;
+  bool                m_directSoftwareTexture = false;
 
   Wrappers::HandleT<Wrappers::HandleTraits::HANDLENullTraits> m_thread[3];
   Wrappers::Event m_terminateEvent;
@@ -170,12 +171,23 @@ private:
     CD3D12CommandSlot * slot, bool result, void * param1, void * param2);
   static void CandidateCompletionFunction(
     CD3D12CommandSlot * slot, bool result, void * param1, void * param2);
+  static void SoftwareCompletionFunction(
+    CD3D12CommandSlot * slot, bool result, void * param1, void * param2);
   void AccumulateFrameDamage(const RECT * dirtyRects, unsigned nbDirtyRects);
+  bool HasPendingDamage();
+  bool TakePendingDamage(RECT dirtyRects[], unsigned * nbDirtyRects);
+  void RestorePendingDamage(const RECT dirtyRects[],
+    unsigned nbDirtyRects, bool hasDamage);
+  void CommitFrameDamage(
+    const RECT dirtyRects[], unsigned nbDirtyRects);
   void SetFullPendingDamage();
 #ifdef HAS_IDDCX_110
   void UpdateHDRMetadata(const IDDCX_METADATA2& metadata);
 #endif
   bool GetContentHDRMetadata(D12FrameFormat& format) const;
+  bool PublishSoftwareFrame(CInteropResource * srcRes,
+    const D12FrameFormat& srcFormat, uint64_t captureTime,
+    uint64_t postProcessStart, bool noImageUpdate);
   bool SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer,
     unsigned dirtyRectCount, unsigned moveRegionCount,
     DXGI_COLOR_SPACE_TYPE colorSpace, UINT sdrWhiteLevel,