766 lines
20 KiB
C++
766 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Roland Mainz <Roland.Mainz@informatik.med.uni-giessen.de>
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* IBM Corp.
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*/
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#include "nsDeviceContext.h"
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#include "nsFont.h"
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#include "nsIView.h"
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#include "nsGfxCIID.h"
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#include "nsVoidArray.h"
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#include "nsIFontMetrics.h"
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#include "nsHashtable.h"
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#include "nsILanguageAtomService.h"
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#include "nsIServiceManager.h"
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#include "nsUnicharUtils.h"
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NS_IMPL_ISUPPORTS3(DeviceContextImpl, nsIDeviceContext, nsIObserver, nsISupportsWeakReference)
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DeviceContextImpl :: DeviceContextImpl()
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{
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NS_INIT_REFCNT();
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mFontCache = nsnull;
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mDevUnitsToAppUnits = 1.0f;
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mAppUnitsToDevUnits = 1.0f;
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mGammaValue = 1.0f;
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mCPixelScale = 1.0f;
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mGammaTable = new PRUint8[256];
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mZoom = 1.0f;
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mTextZoom = 1.0f;
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mWidget = nsnull;
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mFontAliasTable = nsnull;
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#ifdef NS_PRINT_PREVIEW
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mUseAltDC = kUseAltDCFor_NONE;
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#endif
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#ifdef NS_DEBUG
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mInitialized = PR_FALSE;
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#endif
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}
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static PRBool PR_CALLBACK DeleteValue(nsHashKey* aKey, void* aValue, void* closure)
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{
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delete ((nsString*)aValue);
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return PR_TRUE;
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}
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DeviceContextImpl :: ~DeviceContextImpl()
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{
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nsCOMPtr<nsIObserverService> obs(do_GetService("@mozilla.org/observer-service;1"));
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if (obs)
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obs->RemoveObserver(this, "memory-pressure");
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if (nsnull != mFontCache)
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{
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delete mFontCache;
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mFontCache = nsnull;
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}
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if (nsnull != mGammaTable)
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{
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delete[] mGammaTable;
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mGammaTable = nsnull;
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}
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if (nsnull != mFontAliasTable) {
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mFontAliasTable->Enumerate(DeleteValue);
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delete mFontAliasTable;
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}
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}
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NS_IMETHODIMP
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DeviceContextImpl::Observe(nsISupports* aSubject, const char* aTopic, const PRUnichar* aSomeData)
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{
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if (mFontCache && !nsCRT::strcmp(aTopic, "memory-pressure")) {
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mFontCache->Compact();
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}
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: Init(nsNativeWidget aWidget)
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{
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mWidget = aWidget;
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CommonInit();
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return NS_OK;
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}
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void DeviceContextImpl :: CommonInit(void)
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{
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#ifdef NS_DEBUG
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NS_ASSERTION(!mInitialized, "device context is initialized twice!");
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mInitialized = PR_TRUE;
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#endif
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for (PRInt32 cnt = 0; cnt < 256; cnt++)
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mGammaTable[cnt] = cnt;
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// register as a memory-pressure observer to free font resources
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// in low-memory situations.
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nsCOMPtr<nsIObserverService> obs(do_GetService("@mozilla.org/observer-service;1"));
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if (obs)
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obs->AddObserver(this, "memory-pressure", PR_TRUE);
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}
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NS_IMETHODIMP DeviceContextImpl :: GetTwipsToDevUnits(float &aTwipsToDevUnits) const
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{
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aTwipsToDevUnits = mTwipsToPixels;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetDevUnitsToTwips(float &aDevUnitsToTwips) const
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{
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aDevUnitsToTwips = mPixelsToTwips;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: SetAppUnitsToDevUnits(float aAppUnits)
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{
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mAppUnitsToDevUnits = aAppUnits;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: SetDevUnitsToAppUnits(float aDevUnits)
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{
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mDevUnitsToAppUnits = aDevUnits;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetAppUnitsToDevUnits(float &aAppUnits) const
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{
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aAppUnits = mAppUnitsToDevUnits;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetDevUnitsToAppUnits(float &aDevUnits) const
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{
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aDevUnits = mDevUnitsToAppUnits;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetCanonicalPixelScale(float &aScale) const
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{
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aScale = mCPixelScale;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: SetCanonicalPixelScale(float aScale)
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{
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mCPixelScale = aScale;
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return NS_OK;
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}
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static NS_DEFINE_CID(kRCCID, NS_RENDERING_CONTEXT_CID);
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NS_IMETHODIMP DeviceContextImpl :: CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext)
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{
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#ifdef NS_PRINT_PREVIEW
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// AltDC NEVER use widgets to create their DCs
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if (mAltDC && (mUseAltDC & kUseAltDCFor_CREATE_RC)) {
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return mAltDC->CreateRenderingContext(aContext);
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}
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#endif
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nsIRenderingContext *pContext;
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nsIWidget *win;
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aView->GetWidget(win);
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nsresult rv;
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aContext = nsnull;
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rv = nsComponentManager::CreateInstance(kRCCID, nsnull, NS_GET_IID(nsIRenderingContext), (void **)&pContext);
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if (NS_OK == rv) {
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rv = InitRenderingContext(pContext, win);
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if (NS_OK != rv) {
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NS_RELEASE(pContext);
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}
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}
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NS_IF_RELEASE(win);
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aContext = pContext;
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return rv;
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}
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NS_IMETHODIMP DeviceContextImpl :: CreateRenderingContext(nsIWidget *aWidget, nsIRenderingContext *&aContext)
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{
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nsIRenderingContext *pContext;
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nsresult rv;
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#ifdef NS_PRINT_PREVIEW
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// AltDC NEVER use widgets to create their DCs
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// NOTE: The mAltDC will call it;s own init
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// so we can return here
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if (mAltDC && (mUseAltDC & kUseAltDCFor_CREATE_RC)) {
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return mAltDC->CreateRenderingContext(aContext);
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}
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#endif
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aContext = nsnull;
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rv = nsComponentManager::CreateInstance(kRCCID, nsnull, NS_GET_IID(nsIRenderingContext), (void **)&pContext);
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if (NS_OK == rv) {
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rv = InitRenderingContext(pContext, aWidget);
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if (NS_OK != rv) {
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NS_RELEASE(pContext);
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}
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}
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aContext = pContext;
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return rv;
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}
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NS_IMETHODIMP DeviceContextImpl :: InitRenderingContext(nsIRenderingContext *aContext, nsIWidget *aWin)
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{
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#ifdef NS_PRINT_PREVIEW
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// there are a couple of cases where the kUseAltDCFor_CREATE_RC flag has been turned off
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// but we still need to initialize with the Alt DC
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if (mAltDC) {
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return aContext->Init(mAltDC, aWin);
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} else {
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return aContext->Init(this, aWin);
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}
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#else
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return aContext->Init(this, aWin);
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#endif
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}
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NS_IMETHODIMP DeviceContextImpl::CreateFontCache()
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{
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mFontCache = new nsFontCache();
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if (nsnull == mFontCache) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mFontCache->Init(this);
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl::FontMetricsDeleted(const nsIFontMetrics* aFontMetrics)
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{
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if (mFontCache) {
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mFontCache->FontMetricsDeleted(aFontMetrics);
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}
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return NS_OK;
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}
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void
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DeviceContextImpl::GetLocaleLangGroup(void)
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{
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if (!mLocaleLangGroup) {
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nsCOMPtr<nsILanguageAtomService> langService;
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langService = do_GetService(NS_LANGUAGEATOMSERVICE_CONTRACTID);
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if (langService) {
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langService->GetLocaleLanguageGroup(getter_AddRefs(mLocaleLangGroup));
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}
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if (!mLocaleLangGroup) {
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mLocaleLangGroup = getter_AddRefs(NS_NewAtom("x-western"));
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}
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}
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}
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NS_IMETHODIMP DeviceContextImpl::GetMetricsFor(const nsFont& aFont,
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nsIAtom* aLangGroup, nsIFontMetrics*& aMetrics)
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{
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#ifdef NS_PRINT_PREVIEW
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// Defer to Alt when there is one
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if (mAltDC != nsnull && (mUseAltDC & kUseAltDCFor_FONTMETRICS)) {
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return mAltDC->GetMetricsFor(aFont, aLangGroup, aMetrics);
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}
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#endif
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if (nsnull == mFontCache) {
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nsresult rv = CreateFontCache();
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if (NS_FAILED(rv)) {
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aMetrics = nsnull;
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return rv;
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}
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// XXX temporary fix for performance problem -- erik
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GetLocaleLangGroup();
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}
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// XXX figure out why aLangGroup is NULL sometimes
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if (!aLangGroup) {
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aLangGroup = mLocaleLangGroup;
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}
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return mFontCache->GetMetricsFor(aFont, aLangGroup, aMetrics);
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}
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NS_IMETHODIMP DeviceContextImpl::GetMetricsFor(const nsFont& aFont, nsIFontMetrics*& aMetrics)
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{
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#ifdef NS_PRINT_PREVIEW
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// Defer to Alt when there is one
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if (mAltDC != nsnull && (mUseAltDC & kUseAltDCFor_FONTMETRICS)) {
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return mAltDC->GetMetricsFor(aFont, aMetrics);
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}
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#endif
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if (nsnull == mFontCache) {
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nsresult rv = CreateFontCache();
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if (NS_FAILED(rv)) {
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aMetrics = nsnull;
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return rv;
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}
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// XXX temporary fix for performance problem -- erik
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GetLocaleLangGroup();
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}
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return mFontCache->GetMetricsFor(aFont, mLocaleLangGroup, aMetrics);
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}
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NS_IMETHODIMP DeviceContextImpl :: SetZoom(float aZoom)
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{
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if (mZoom != aZoom) {
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mZoom = aZoom;
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FlushFontCache();
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}
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetZoom(float &aZoom) const
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{
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aZoom = mZoom;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: SetTextZoom(float aTextZoom)
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{
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if (mTextZoom != aTextZoom) {
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mTextZoom = aTextZoom;
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FlushFontCache();
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}
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetTextZoom(float &aTextZoom) const
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{
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aTextZoom = mTextZoom;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetGamma(float &aGamma)
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{
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aGamma = mGammaValue;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: SetGamma(float aGamma)
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{
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if (aGamma != mGammaValue)
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{
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//we don't need to-recorrect existing images for this case
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//so pass in 1.0 for the current gamma regardless of what it
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//really happens to be. existing images will get a one time
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//re-correction when they're rendered the next time. MMP
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SetGammaTable(mGammaTable, 1.0f, aGamma);
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mGammaValue = aGamma;
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}
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl :: GetGammaTable(PRUint8 *&aGammaTable)
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{
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//XXX we really need to ref count this somehow. MMP
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aGammaTable = mGammaTable;
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return NS_OK;
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}
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void DeviceContextImpl :: SetGammaTable(PRUint8 * aTable, float aCurrentGamma, float aNewGamma)
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{
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double fgval = (1.0f / aCurrentGamma) * (1.0f / aNewGamma);
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for (PRInt32 cnt = 0; cnt < 256; cnt++)
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aTable[cnt] = (PRUint8)(pow((double)cnt * (1. / 256.), fgval) * 255.99999999);
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}
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NS_IMETHODIMP DeviceContextImpl::GetDepth(PRUint32& aDepth)
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{
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aDepth = 24;
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return NS_OK;
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}
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NS_IMETHODIMP DeviceContextImpl::GetPaletteInfo(nsPaletteInfo& aPaletteInfo)
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{
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aPaletteInfo.isPaletteDevice = PR_FALSE;
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aPaletteInfo.sizePalette = 0;
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aPaletteInfo.numReserved = 0;
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aPaletteInfo.palette = nsnull;
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return NS_OK;
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}
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struct FontEnumData {
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FontEnumData(nsIDeviceContext* aDC, nsString& aFaceName)
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: mDC(aDC), mFaceName(aFaceName)
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{}
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nsIDeviceContext* mDC;
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nsString& mFaceName;
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};
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static PRBool FontEnumCallback(const nsString& aFamily, PRBool aGeneric, void *aData)
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{
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FontEnumData* data = (FontEnumData*)aData;
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// XXX for now, all generic fonts are presumed to exist
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// we may want to actually check if there's an installed conversion
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if (aGeneric) {
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data->mFaceName = aFamily;
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return PR_FALSE; // found one, stop.
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}
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else {
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nsAutoString local;
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PRBool aliased;
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data->mDC->GetLocalFontName(aFamily, local, aliased);
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if (aliased || (NS_OK == data->mDC->CheckFontExistence(local))) {
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data->mFaceName = local;
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return PR_FALSE; // found one, stop.
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}
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}
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return PR_TRUE; // didn't exist, continue looking
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}
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NS_IMETHODIMP DeviceContextImpl::FirstExistingFont(const nsFont& aFont, nsString& aFaceName)
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{
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FontEnumData data(this, aFaceName);
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if (aFont.EnumerateFamilies(FontEnumCallback, &data)) {
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return NS_ERROR_FAILURE; // ran out
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}
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return NS_OK;
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}
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class FontAliasKey: public nsHashKey
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{
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public:
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FontAliasKey(const nsString& aString)
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{mString.Assign(aString);}
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virtual PRUint32 HashCode(void) const;
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virtual PRBool Equals(const nsHashKey *aKey) const;
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virtual nsHashKey *Clone(void) const;
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nsString mString;
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};
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PRUint32 FontAliasKey::HashCode(void) const
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{
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PRUint32 hash = 0;
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const PRUnichar* string = mString.get();
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PRUnichar ch;
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while ((ch = *string++) != 0) {
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// FYI: hash = hash*37 + ch
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ch = ToUpperCase(ch);
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hash = ((hash << 5) + (hash << 2) + hash) + ch;
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}
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return hash;
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}
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PRBool FontAliasKey::Equals(const nsHashKey *aKey) const
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{
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return mString.EqualsIgnoreCase(((FontAliasKey*)aKey)->mString);
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}
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nsHashKey* FontAliasKey::Clone(void) const
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{
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return new FontAliasKey(mString);
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}
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nsresult DeviceContextImpl::CreateFontAliasTable()
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{
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nsresult result = NS_OK;
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if (nsnull == mFontAliasTable) {
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mFontAliasTable = new nsHashtable();
|
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if (nsnull != mFontAliasTable) {
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nsAutoString times; times.Assign(NS_LITERAL_STRING("Times"));
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nsAutoString timesNewRoman; timesNewRoman.Assign(NS_LITERAL_STRING("Times New Roman"));
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nsAutoString timesRoman; timesRoman.Assign(NS_LITERAL_STRING("Times Roman"));
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nsAutoString arial; arial.Assign(NS_LITERAL_STRING("Arial"));
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nsAutoString helvetica; helvetica.Assign(NS_LITERAL_STRING("Helvetica"));
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nsAutoString courier; courier.Assign(NS_LITERAL_STRING("Courier"));
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nsAutoString courierNew; courierNew.Assign(NS_LITERAL_STRING("Courier New"));
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nsAutoString nullStr;
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AliasFont(times, timesNewRoman, timesRoman, PR_FALSE);
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AliasFont(timesRoman, timesNewRoman, times, PR_FALSE);
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AliasFont(timesNewRoman, timesRoman, times, PR_FALSE);
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AliasFont(arial, helvetica, nullStr, PR_FALSE);
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AliasFont(helvetica, arial, nullStr, PR_FALSE);
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AliasFont(courier, courierNew, nullStr, PR_TRUE);
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AliasFont(courierNew, courier, nullStr, PR_FALSE);
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}
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else {
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result = NS_ERROR_OUT_OF_MEMORY;
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}
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}
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return result;
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}
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|
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nsresult DeviceContextImpl::AliasFont(const nsString& aFont,
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const nsString& aAlias, const nsString& aAltAlias,
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PRBool aForceAlias)
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{
|
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nsresult result = NS_OK;
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|
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if (nsnull != mFontAliasTable) {
|
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if (aForceAlias || (NS_OK != CheckFontExistence(aFont))) {
|
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if (NS_OK == CheckFontExistence(aAlias)) {
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nsString* entry = new nsString(aAlias);
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if (nsnull != entry) {
|
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FontAliasKey key(aFont);
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mFontAliasTable->Put(&key, entry);
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}
|
|
else {
|
|
result = NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
else if ((0 < aAltAlias.Length()) && (NS_OK == CheckFontExistence(aAltAlias))) {
|
|
nsString* entry = new nsString(aAltAlias);
|
|
if (nsnull != entry) {
|
|
FontAliasKey key(aFont);
|
|
mFontAliasTable->Put(&key, entry);
|
|
}
|
|
else {
|
|
result = NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
result = NS_ERROR_FAILURE;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
NS_IMETHODIMP DeviceContextImpl::GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
|
|
PRBool& aAliased)
|
|
{
|
|
nsresult result = NS_OK;
|
|
|
|
if (nsnull == mFontAliasTable) {
|
|
result = CreateFontAliasTable();
|
|
}
|
|
|
|
if (nsnull != mFontAliasTable) {
|
|
FontAliasKey key(aFaceName);
|
|
const nsString* alias = (const nsString*)mFontAliasTable->Get(&key);
|
|
if (nsnull != alias) {
|
|
aLocalName = *alias;
|
|
aAliased = PR_TRUE;
|
|
}
|
|
else {
|
|
aLocalName = aFaceName;
|
|
aAliased = PR_FALSE;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
NS_IMETHODIMP DeviceContextImpl :: FlushFontCache(void)
|
|
{
|
|
if (nsnull != mFontCache)
|
|
mFontCache->Flush();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
#ifdef NS_PRINT_PREVIEW
|
|
NS_IMETHODIMP DeviceContextImpl :: SetAltDevice(nsIDeviceContext* aAltDC)
|
|
{
|
|
mAltDC = aAltDC;
|
|
|
|
// Can't use it if it isn't there
|
|
if (aAltDC == nsnull) {
|
|
mUseAltDC = kUseAltDCFor_NONE;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP DeviceContextImpl :: SetUseAltDC(PRUint8 aValue, PRBool aOn)
|
|
{
|
|
if (aOn) {
|
|
mUseAltDC |= aValue;
|
|
} else {
|
|
mUseAltDC &= ~aValue;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
#endif
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
|
|
MOZ_DECL_CTOR_COUNTER(nsFontCache)
|
|
|
|
nsFontCache :: nsFontCache()
|
|
{
|
|
MOZ_COUNT_CTOR(nsFontCache);
|
|
mContext = nsnull;
|
|
}
|
|
|
|
nsFontCache :: ~nsFontCache()
|
|
{
|
|
MOZ_COUNT_DTOR(nsFontCache);
|
|
Flush();
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsFontCache :: Init(nsIDeviceContext* aContext)
|
|
{
|
|
NS_PRECONDITION(nsnull != aContext, "null ptr");
|
|
// Note: we don't hold a reference to the device context, because it
|
|
// holds a reference to us and we don't want circular references
|
|
mContext = aContext;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsFontCache :: GetDeviceContext(nsIDeviceContext *&aContext) const
|
|
{
|
|
aContext = mContext;
|
|
NS_IF_ADDREF(aContext);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsFontCache :: GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
|
|
nsIFontMetrics *&aMetrics)
|
|
{
|
|
// First check our cache
|
|
// start from the end, which is where we put the most-recent-used element
|
|
|
|
nsIFontMetrics* fm;
|
|
PRInt32 n = mFontMetrics.Count() - 1;
|
|
for (PRInt32 i = n; i >= 0; --i) {
|
|
fm = NS_STATIC_CAST(nsIFontMetrics*, mFontMetrics[i]);
|
|
const nsFont* font;
|
|
fm->GetFont(font);
|
|
if (font->Equals(aFont)) {
|
|
nsCOMPtr<nsIAtom> langGroup;
|
|
fm->GetLangGroup(getter_AddRefs(langGroup));
|
|
if (aLangGroup == langGroup.get()) {
|
|
if (i != n) {
|
|
// promote it to the end of the cache
|
|
mFontMetrics.MoveElement(i, n);
|
|
}
|
|
NS_ADDREF(aMetrics = fm);
|
|
return NS_OK;
|
|
}
|
|
}
|
|
}
|
|
|
|
// It's not in the cache. Get font metrics and then cache them.
|
|
|
|
aMetrics = nsnull;
|
|
nsresult rv = CreateFontMetricsInstance(&fm);
|
|
if (NS_FAILED(rv)) return rv;
|
|
rv = fm->Init(aFont, aLangGroup, mContext);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
// the mFontMetrics list has the "head" at the end, because append is
|
|
// cheaper than insert
|
|
mFontMetrics.AppendElement(fm);
|
|
aMetrics = fm;
|
|
NS_ADDREF(aMetrics);
|
|
return NS_OK;
|
|
}
|
|
fm->Destroy();
|
|
NS_RELEASE(fm);
|
|
|
|
// One reason why Init() fails is because the system is running out of resources.
|
|
// e.g., on Win95/98 only a very limited number of GDI objects are available.
|
|
// Compact the cache and try again.
|
|
|
|
Compact();
|
|
rv = CreateFontMetricsInstance(&fm);
|
|
if (NS_FAILED(rv)) return rv;
|
|
rv = fm->Init(aFont, aLangGroup, mContext);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
mFontMetrics.AppendElement(fm);
|
|
aMetrics = fm;
|
|
NS_ADDREF(aMetrics);
|
|
return NS_OK;
|
|
}
|
|
fm->Destroy();
|
|
NS_RELEASE(fm);
|
|
|
|
// could not setup a new one, send an old one (XXX search a "best match"?)
|
|
|
|
n = mFontMetrics.Count() - 1; // could have changed in Compact()
|
|
if (n >= 0) {
|
|
aMetrics = NS_STATIC_CAST(nsIFontMetrics*, mFontMetrics[n]);
|
|
NS_ADDREF(aMetrics);
|
|
return NS_OK;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/* PostScript and Xprint module may override this method to create
|
|
* nsIFontMetrics objects with their own classes
|
|
*/
|
|
NS_IMETHODIMP
|
|
nsFontCache::CreateFontMetricsInstance(nsIFontMetrics** fm)
|
|
{
|
|
static NS_DEFINE_CID(kFontMetricsCID, NS_FONT_METRICS_CID);
|
|
return CallCreateInstance(kFontMetricsCID, fm);
|
|
}
|
|
|
|
nsresult nsFontCache::FontMetricsDeleted(const nsIFontMetrics* aFontMetrics)
|
|
{
|
|
mFontMetrics.RemoveElement((void*)aFontMetrics);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult nsFontCache::Compact()
|
|
{
|
|
// Need to loop backward because the running element can be removed on the way
|
|
for (PRInt32 i = mFontMetrics.Count()-1; i >= 0; --i) {
|
|
nsIFontMetrics* fm = NS_STATIC_CAST(nsIFontMetrics*, mFontMetrics[i]);
|
|
nsIFontMetrics* oldfm = fm;
|
|
// Destroy() isn't here because we want our device context to be notified
|
|
NS_RELEASE(fm); // this will reset fm to nsnull
|
|
// if the font is really gone, it would have called back in
|
|
// FontMetricsDeleted() and would have removed itself
|
|
if (mFontMetrics.IndexOf(oldfm) >= 0) {
|
|
// nope, the font is still there, so let's hold onto it too
|
|
NS_ADDREF(oldfm);
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult nsFontCache :: Flush()
|
|
{
|
|
for (PRInt32 i = mFontMetrics.Count()-1; i >= 0; --i) {
|
|
nsIFontMetrics* fm = NS_STATIC_CAST(nsIFontMetrics*, mFontMetrics[i]);
|
|
// Destroy() will unhook our device context from the fm so that we won't
|
|
// waste time in triggering the notification of FontMetricsDeleted()
|
|
// in the subsequent release
|
|
fm->Destroy();
|
|
NS_RELEASE(fm);
|
|
}
|
|
|
|
mFontMetrics.Clear();
|
|
|
|
return NS_OK;
|
|
}
|
|
|