[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/CIndirectDeviceContext.h

@@ -280,7 +280,8 @@ public:
     bool     fullCopy;
   };
 
-  bool FrameBufferAvailable(const CFrameScheduler::Schedule& schedule);
+  bool FrameBufferAvailable(const CFrameScheduler::Schedule& schedule,
+    bool allowReadyReplacement = true);
   bool HasPublishedFrame() const
   {
     return m_readyFrameIndex.load(std::memory_order_acquire) >= 0;
@@ -291,7 +292,8 @@ public:
   PreparedFrameBuffer PrepareFrameBuffer(unsigned pitch,
     const D12FrameFormat& srcFormat, const D12FrameFormat& dstFormat,
     const RECT * dirtyRects, unsigned nbDirtyRects,
-    const CFrameScheduler::Schedule& schedule);
+    const CFrameScheduler::Schedule& schedule,
+    bool allowReadyReplacement = true);
   bool PublishFrameBuffer(unsigned frameIndex,
     const CFrameScheduler::Schedule& schedule, bool& deliveredToOwner);
   bool RepublishFrameBuffer(const CFrameScheduler::Schedule& schedule);
@@ -308,6 +310,8 @@ public:
     uint64_t holdTime, const CFrameScheduler::Schedule& schedule,
     uint64_t completedAt);
   void WriteFrameBuffer(unsigned frameIndex, void* src, size_t offset, size_t len, bool setWritePos) const;
+  void WriteFrameBufferRows(unsigned frameIndex, void * src,
+    size_t offset, size_t rowBytes, size_t pitch, unsigned rows) const;
   void FinalizeFrameBuffer(unsigned frameIndex) const;
 
   void ObserveFrame(uint64_t now);