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https://github.com/microsoft/Microsoft-3D-Movie-Maker.git
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106 lines
2.3 KiB
Plaintext
106 lines
2.3 KiB
Plaintext
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/***************************************************************************
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Memory Management API doc.
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***************************************************************************/
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/****************************************
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Types
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****************************************/
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HQ
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An opaque handle to a generic memory block.
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Implementation is private.
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HN
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An operating system handle. On Mac, these are Handles.
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On Win, they are HGLOBAL.
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/****************************************
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Constants
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****************************************/
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const byte kbGarbage;
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New blocks are filled with this (if they are not zeroed)
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const long kcbMax;
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Maximum size of an HQ.
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HQ hqNil;
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pNil
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hNil
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It is legal to assume these are zero. Use hqNil to compare
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against an explicit hq, pNil for pointers and hNil for any
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other abstract handle.
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fhqNil - default options
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fhqClear - zero newly allocated memory
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/****************************************
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Routines
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****************************************/
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HQ HqAlloc(long cb, ushort grfhq);
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Allocates an hq and optionally clears it.
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void FreeHq(HQ hq);
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Frees an hq. Accepts hqNil.
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void FreePhq(HQ *phq);
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Calls FreeHq on *phq and sets *phq to hqNil.
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long CbOfHq(HQ hq);
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Returns the size of the hq. This is guaranteed to be the
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same as the cb passed to HqAlloc (or FResizePhq).
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HQ HqCopyHq(HQ hq);
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Duplicates the hq.
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bool FResizePhq(HQ *phq, long cb, ushort grfhq);
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Resizes *phq. The value of *phq may change.
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void *PvLockHq(HQ hq);
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Lock the hq and return a pointer to the data.
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void UnlockHq(HQ hq);
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Unlock the hq. Must balance a call to PvLockHq or LockHq.
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void *QvFromHq(HQ hq);
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Return a volatile pointer to the hq block.
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/****************************************
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Generic pointer arithmetic
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****************************************/
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void *PvAddBv(void *pv, long bv);
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Add an offset to a pointer.
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void *PvSubBv(void *pv, long bv);
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Subtract an offset from a pointer.
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long BvSubPvs(void *pv1, void *pv2)
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Subtract two pointers to get the number of bytes between them.
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/****************************************
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Debug only API
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****************************************/
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void UnmarkAllHqs(void);
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Clear the marks on all hq's.
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void MarkHq(HQ hq);
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Marks an hq.
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void AssertUnmarkedHqs(void);
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Asserts on any unmarked hqs.
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void AssertHq(HQ hq);
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Validate an hq. hq should not be nil.
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