87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
/**************************************************************************
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*
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* Copyright (c) 2000 Microsoft Corporation
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*
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* Module Name:
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*
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* GpCachedBitmap object
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*
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*
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* Created:
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*
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* 04/23/2000 asecchia
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* Created it.
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*
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**************************************************************************/
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#ifndef _CACHEDBITMAP_HPP
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#define _CACHEDBITMAP_HPP
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class GpCachedBitmap
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{
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friend GpGraphics;
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// We now use an ObjectTag to determine if the object is valid
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// instead of using a BOOL. This is much more robust and helps
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// with debugging. It also enables us to version our objects
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// more easily with a version number in the ObjectTag.
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ObjectTag Tag; // Keep this as the 1st value in the object!
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GpLockable Lockable;
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DpCachedBitmap DeviceCachedBitmap;
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protected:
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VOID SetValid(BOOL valid)
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{
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Tag = valid ? ObjectCachedBitmap : ObjectTagInvalid;
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}
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public:
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// constructor and destructor
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GpCachedBitmap(GpBitmap *bitmap, GpGraphics *graphics);
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virtual ~GpCachedBitmap();
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// 'getter' state retrieval
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BOOL IsValid() const
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{
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#ifdef _X86_
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// We have to guarantee that the Tag field doesn't move for
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// versioning to work between releases of GDI+.
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ASSERT(offsetof(GpCachedBitmap, Tag) == 4);
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#endif
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ASSERT((Tag == ObjectCachedBitmap) || (Tag == ObjectTagInvalid));
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#if DBG
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if (Tag == ObjectTagInvalid)
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{
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WARNING1("Invalid CachedBitmap");
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}
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#endif
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return (Tag == ObjectCachedBitmap);
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}
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void GetSize(Size *s)
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{
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// Get the width and height from the DeviceCachedBitmap.
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s->Width = DeviceCachedBitmap.Width;
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s->Height = DeviceCachedBitmap.Height;
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}
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// Get the lock object
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GpLockable *GetObjectLock()
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{
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return &Lockable;
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}
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};
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#endif
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