// $Id: rndstack.h 751 2006-03-31 15:43:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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See the GNU General Public License for more details.

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with Xara LX (see the file GPL in the root directory of the
distribution); if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA  02110-1301 USA


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-----------------

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License described above, Xara Group Ltd grants to you certain additional
rights. 

The additional rights are to use, modify, and distribute the software
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----------------

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      Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK.
                        http://www.xara.com/

=================================XARAHEADEREND============================
 */

// A attribute stack to be used when rendering Camelot files.

#ifndef INC_RNDSTACK
#define INC_RNDSTACK

class AttributeValue;
class AttributeRec;
class RenderRegion;

/********************************************************************************************

>	class RenderStack : public CC_CLASS_MEMDUMP

	Author:		Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
	Created:	28/01/94
	Purpose:	To provide a stack on which to save attribute values while rendering
				the Camelot tree.  The stack is optimised to minimise the amount of
				pushing and popping actually done.
	SeeAlso:	AttributeRec; RenderRegion; AttributeValue; NodeAttribute

********************************************************************************************/

class RenderStack : public CC_CLASS_MEMDUMP
{
	CC_DECLARE_MEMDUMP(RenderStack)

public:
	RenderStack();
	~RenderStack();
	BOOL Push(AttributeValue *pAttrValue, BOOL Temporary = FALSE);

	// The Rendering Context (Attributes)
	void SaveContext() { ContextLevel++; }
	void RestoreContext(RenderRegion *pRegion);

	void CleanUpBeforeDestruct(RenderRegion *pRegion);
			// Restores the context stack to ContextLevel 0 by properly popping all
			// entries, allowing all attributes to clean up properly.
	
	// Function to copy one RenderStack to another
	BOOL Copy(const RenderStack *Other, RenderRegion *pRegion);

private:
	BOOL GrowStack();

	// Pointer to the attribute stack - it's treated as a variable size array.
	AttributeRec *TheStack;

	// Index of next empty item in stack; 0 => stack is empty.
	// (It's an 'empty' stack, i.e. Top points to the next free item in the stack).
	UINT32 Top;

	// Size of stack
	UINT32 StackLimit;

	// Current stack context level.
	UINT32 ContextLevel;
};

#endif // INC_RNDSTACK