graphicsdeviceinterface/gdi/sgdi/TFSTORE.CPP
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:47:50 +0200
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// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <gdi.h>
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#include "GDIPANIC.h"
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_LIT(KCTypefaceStore, "CTypefaceStore");
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static const TInt KDefaultNumOfFontAccess = 4;
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//
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// CTypefaceStore
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//
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EXPORT_C CTypefaceStore::CTypefaceStore()
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	{
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	}
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EXPORT_C CTypefaceStore::~CTypefaceStore()
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/** Destroys the typeface store and reclaims the memory allocated to it. */
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	{
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	if (iFontAccess)
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		{
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		const TInt count = iFontAccess->Count();
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		for (TInt i = 0; i < count; i++)
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			{
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			GDI_ASSERT_DEBUG_GENERAL((*iFontAccess)[0].iAccessCount > 0, User::Panic(KCTypefaceStore, KErrCorrupt));
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			GDI_ASSERT_DEBUG_GENERAL((*iFontAccess)[0].iAccessCount == 1, User::Panic(KCTypefaceStore, KErrInUse));
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			delete (*iFontAccess)[0].iFont;
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			iFontAccess->Delete(0);
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			}
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		delete iFontAccess;
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		}
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	}
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EXPORT_C void CTypefaceStore::ConstructL()
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/** Second phase constructor. */
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	{
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	iFontAccess = new(ELeave) CArrayFixFlat<TFontAccess>(KDefaultNumOfFontAccess);
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	}
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EXPORT_C void CTypefaceStore::AddFontL(CFont* aFont)
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/** Adds a hold, by a client of the typeface store, on the specified font.
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If the specified font is not currently accessed by any clients of the typeface store
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then the font is added to the font list and the access count set to 1.
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If it is currently accessed then the access count for the font is incremented by 1.
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@param aFont Pointer to the device specific font accessed. */
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	{
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	GDI_ASSERT_DEBUG_GENERAL(NULL != iFontAccess, User::Panic(KCTypefaceStore, KErrNoMemory));
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	if (IncrementFontCount(aFont))
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		return;
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	TFontAccess fontAccess;
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	fontAccess.iAccessCount = 1;
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	fontAccess.iFont = aFont;
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	iFontAccess->AppendL(fontAccess);
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	}
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EXPORT_C void CTypefaceStore::ReleaseFont(CFont* aFont)
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/** Releases the hold of a typeface store client on a specified font.
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Decrements the access-count for the specified font by one. If this reduces the access-count 
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to zero then the font is no longer needed by any client, and is deleted from 
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the typeface store list.
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@param aFont The font to be released by the client. */
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	{
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	GDI_ASSERT_DEBUG_GENERAL(NULL != iFontAccess, User::Panic(KCTypefaceStore, KErrNoMemory));
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	if (!aFont)
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		return;
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	TInt idx = 0;
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	GDI_ASSERT_ALWAYS_GENERAL(FindFont(aFont, idx), User::Panic(KCTypefaceStore, KErrNotFound));
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	GDI_ASSERT_DEBUG_GENERAL(0 < iFontAccess->At(idx).iAccessCount, User::Panic(KCTypefaceStore, KErrCorrupt));
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	iFontAccess->At(idx).iAccessCount--;
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	if (0 == iFontAccess->At(idx).iAccessCount)
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		{
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		CFont *font=iFontAccess->At(idx).iFont;
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		iFontAccess->Delete(idx);
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		delete font;
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		}
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	}
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EXPORT_C TBool CTypefaceStore::IncrementFontCount(const CFont* aFont)
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/**
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Search for the font in iFontAccess and increment its count.
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@param aFont Font to search for.
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@return ETrue if the specified font is found, EFalse otherwise.
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*/
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	{
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	TInt idx = 0;
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	if (FindFont(aFont, idx))
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		{
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		iFontAccess->At(idx).iAccessCount++;
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		return ETrue;
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		}
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	return EFalse;
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	}
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TBool CTypefaceStore::FindFont(const CFont* aFont, TInt& aIdx) const
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/**
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Search for the font in iFontAccess.
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@param aFont Font to search for.
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@param aIdx Index of the font found.
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@return ETrue if the specified font is found, EFalse with aIdx = -1 otherwise.
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*/
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	{
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	aIdx = -1;
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	if (!iFontAccess)
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		return EFalse;
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	const TInt count = iFontAccess->Count();
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	for (TInt i = 0; i < count; i++)
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		{
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		if ((*iFontAccess)[i].iFont == aFont)
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			{
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			aIdx = i;
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			return ETrue;
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			}
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		}
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	return EFalse;
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	}
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EXPORT_C TInt CTypefaceStore::BaselineOffset(TInt aHeight,TFontPrintPosition aPos)
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/** Gets the baseline offset, in twips, for any font in subscript or superscript 
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form.
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If the print position is normal then zero is returned. If it is superscript 
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then the baseline offset returned is a percentage, KSuperscriptOffsetPercentage, 
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of aHeight. If it is subscript then the baseline offset returned is a percentage, 
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KSubscriptOffsetPercentage, of aHeight.
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@param aHeight The height of a font. 
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@param aPos The print position of the required font: superscript, subscript 
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or normal. 
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@return The baseline offset for the font. */
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	{
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	TInt offset=0;
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	if (aPos==EPrintPosSuperscript)
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		offset=KSuperscriptOffsetPercentage*aHeight/100;
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	else if (aPos==EPrintPosSubscript)
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		offset=KSubscriptOffsetPercentage*aHeight/100;
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	return offset;
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	}
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EXPORT_C TInt CTypefaceStore::SuperSubHeight(TInt aHeight,TFontPrintPosition aPos)
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/** Gets the height for a font in subscript or superscript form. 
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If the print position is normal then aHeight is returned unchanged. If it 
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is superscript or subscript then the height returned is a percentage, KSuperSubScalingPercentage, 
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of aHeight.
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@param aHeight The height of a font. 
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@param aPos The print position of the font: superscript, subscript or normal.
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@return The required height of the font. */
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	{
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	if(aPos!=EPrintPosNormal)
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		aHeight=(KSuperSubScalingPercentage*aHeight)/100;
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	return aHeight;
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	}
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//
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// CFontCache
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//
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EXPORT_C CFontCache::CFontCache():
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	CBase(),
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	iMaxEntries(KMaxFontCacheEntries)
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/** Default constructor.
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This constructs a CFontCache of size KMaxFontCacheEntries. */
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	{
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	__DECLARE_NAME(_S("CFontCache"));
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	}
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EXPORT_C CFontCache::CFontCache(TInt aMaxEntries):
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	CBase(),
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	iMaxEntries(aMaxEntries)
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/** Constructor specifying the number of cache entries.
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@param aMaxEntries Number of entries for this cache. You must ensure this 
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is less than or equal to KMaxFontCacheEntries. */
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	{
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	__DECLARE_NAME(_S("CFontCache"));
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	}
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EXPORT_C CFontCache::~CFontCache()
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/** Destructor. 
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This destroys the cashe and releases its allocated memory. */
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	{
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	CFontCacheEntry* entry=iFirst;
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	while(entry)
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		{
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		iFirst=entry->iNext;
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		delete entry;
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		entry=iFirst;
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		}
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	}
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EXPORT_C CFont* CFontCache::Search(const TFontSpec& aFontSpec)
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/** Searches the cache for a specified font. 
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The CFont returned is that which corresponds to the font specification aFontSpec.
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@param aFontSpec The specification of the font to be searched for. 
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@return If an entry for the font specification is found in the cache, the pointer 
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to the font corresponding to the font specification is returned. Otherwise 
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NULL is returned. */
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	{
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	CFontCacheEntry* entry=iFirst;
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	CFontCacheEntry* previous=NULL;
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	while(entry)
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		{
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		if(entry->iSpec==aFontSpec)
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			{
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			iNumHits++;
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			if(previous)
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				{
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				previous->iNext=entry->iNext;
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				entry->iNext=iFirst;
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				iFirst=entry;
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				}
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			return(entry->iFont);
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			}
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		previous=entry;
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		entry=entry->iNext;
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		}
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	iNumMisses++;
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	return(NULL);
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	}
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EXPORT_C CFont* CFontCache::AddEntryL(CFont* aFont,const TFontSpec& aFontSpec)
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/** Adds a font entry to the cache. 
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The font, and the font specification required to extract it from the cache, 
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are both specified. If the cache is already full, the font replaces the oldest 
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entry already in the cache, which is returned.
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@param aFont The font to be stored in the cache. 
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@param aFontSpec The font's corresponding font specification. 
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@return If the cache isn't full, NULL is returned. If the cache is full, the 
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displaced cache entry is returned. */
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	{
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	CFontCacheEntry* entry=new(ELeave) CFontCacheEntry(aFont,aFontSpec,iFirst);
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	iFirst=entry;
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	iNumEntries++;
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	if(iNumEntries<=iMaxEntries)
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		return(NULL);
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	CFontCacheEntry* previous=NULL;
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	while(entry->iNext)
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		{
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		previous=entry;
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		entry=entry->iNext;
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		}
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	CFont* discardfont=entry->iFont;
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	delete entry;
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	iNumEntries--;
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	if(previous)
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		previous->iNext=NULL;
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	else
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		iFirst=NULL;
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	return(discardfont);
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	}
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EXPORT_C CFont* CFontCache::RemoveFirstEntry()
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/** Removes the first entry from the font cache and returns it.
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@return The entry removed from the font cache. If the cache is empty, NULL 
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is returned. */
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	{
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	if(iFirst==NULL) return(NULL);
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	CFontCacheEntry* entry=iFirst;
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	iFirst=entry->iNext;
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	CFont* font=entry->iFont;
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	delete entry;
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	iNumEntries--;
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	return(font);
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	}
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// CFontCacheEntry
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CFontCache::CFontCacheEntry::CFontCacheEntry(CFont* aFont,const TFontSpec& aFontSpec,CFontCacheEntry* aNext):
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	CBase(),
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	iFont(aFont),
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	iSpec(aFontSpec),
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	iNext(aNext)
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	{
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	__DECLARE_NAME(_S("CFontCacheEntry"));
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	}