mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
603 lines
16 KiB
C++
603 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All 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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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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#include "nsCRT.h"
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#include "nsIRenderingContext.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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mAppUnitsPerDevPixel = -1;
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mAppUnitsPerInch = -1;
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mAppUnitsPerDevNotScaledPixel = -1;
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mPixelScale = 1.0f;
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mFontCache = nsnull;
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mWidget = nsnull;
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mFontAliasTable = nsnull;
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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 != 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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// 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::CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext)
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{
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nsresult rv;
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aContext = nsnull;
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nsCOMPtr<nsIRenderingContext> pContext;
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rv = CreateRenderingContextInstance(*getter_AddRefs(pContext));
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if (NS_SUCCEEDED(rv)) {
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rv = InitRenderingContext(pContext, aView->GetWidget());
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if (NS_SUCCEEDED(rv)) {
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aContext = pContext;
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NS_ADDREF(aContext);
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}
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}
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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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nsresult rv;
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aContext = nsnull;
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nsCOMPtr<nsIRenderingContext> pContext;
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rv = CreateRenderingContextInstance(*getter_AddRefs(pContext));
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if (NS_SUCCEEDED(rv)) {
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rv = InitRenderingContext(pContext, aWidget);
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if (NS_SUCCEEDED(rv)) {
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aContext = pContext;
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NS_ADDREF(aContext);
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}
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}
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return rv;
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}
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NS_IMETHODIMP DeviceContextImpl::CreateRenderingContextInstance(nsIRenderingContext *&aContext)
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{
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static NS_DEFINE_CID(kRenderingContextCID, NS_RENDERING_CONTEXT_CID);
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nsresult rv;
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nsCOMPtr<nsIRenderingContext> pContext = do_CreateInstance(kRenderingContextCID, &rv);
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if (NS_SUCCEEDED(rv)) {
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aContext = pContext;
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NS_ADDREF(aContext);
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}
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return rv;
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}
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nsresult DeviceContextImpl::InitRenderingContext(nsIRenderingContext *aContext, nsIWidget *aWin)
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{
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return aContext->Init(this, aWin);
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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 (!mFontCache) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return mFontCache->Init(this);
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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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mLocaleLangGroup = langService->GetLocaleLanguageGroup();
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}
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if (!mLocaleLangGroup) {
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mLocaleLangGroup = do_GetAtom("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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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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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::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_SUCCEEDED(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.Equals(((FontAliasKey*)aKey)->mString, nsCaseInsensitiveStringComparator());
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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.AssignLiteral("Times");
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nsAutoString timesNewRoman; timesNewRoman.AssignLiteral("Times New Roman");
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nsAutoString timesRoman; timesRoman.AssignLiteral("Times Roman");
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nsAutoString arial; arial.AssignLiteral("Arial");
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nsAutoString helvetica; helvetica.AssignLiteral("Helvetica");
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nsAutoString courier; courier.AssignLiteral("Courier");
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nsAutoString courierNew; courierNew.AssignLiteral("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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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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if (nsnull != mFontAliasTable) {
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if (aForceAlias || NS_FAILED(CheckFontExistence(aFont))) {
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if (NS_SUCCEEDED(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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}
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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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else if (!aAltAlias.IsEmpty() && NS_SUCCEEDED(CheckFontExistence(aAltAlias))) {
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nsString* entry = new nsString(aAltAlias);
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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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}
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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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}
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}
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else {
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result = NS_ERROR_FAILURE;
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}
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return result;
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}
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NS_IMETHODIMP DeviceContextImpl::GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
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PRBool& aAliased)
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{
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nsresult result = NS_OK;
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if (nsnull == mFontAliasTable) {
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result = CreateFontAliasTable();
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}
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if (nsnull != mFontAliasTable) {
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FontAliasKey key(aFaceName);
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const nsString* alias = (const nsString*)mFontAliasTable->Get(&key);
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if (nsnull != alias) {
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aLocalName = *alias;
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aAliased = PR_TRUE;
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}
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else {
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aLocalName = aFaceName;
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aAliased = PR_FALSE;
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}
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}
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return result;
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}
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NS_IMETHODIMP DeviceContextImpl::FlushFontCache(void)
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{
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if (nsnull != mFontCache)
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mFontCache->Flush();
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return NS_OK;
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}
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/////////////////////////////////////////////////////////////
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nsFontCache::nsFontCache()
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{
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MOZ_COUNT_CTOR(nsFontCache);
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mContext = nsnull;
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}
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nsFontCache::~nsFontCache()
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{
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MOZ_COUNT_DTOR(nsFontCache);
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Flush();
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}
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nsresult
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nsFontCache::Init(nsIDeviceContext* aContext)
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{
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NS_PRECONDITION(nsnull != aContext, "null ptr");
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// Note: we don't hold a reference to the device context, because it
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// holds a reference to us and we don't want circular references
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mContext = aContext;
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return NS_OK;
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}
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nsresult
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nsFontCache::GetDeviceContext(nsIDeviceContext *&aContext) const
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{
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aContext = mContext;
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NS_IF_ADDREF(aContext);
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return NS_OK;
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}
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nsresult
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nsFontCache::GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
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nsIFontMetrics *&aMetrics)
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{
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// First check our cache
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// start from the end, which is where we put the most-recent-used element
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nsIFontMetrics* fm;
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PRInt32 n = mFontMetrics.Count() - 1;
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for (PRInt32 i = n; i >= 0; --i) {
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fm = static_cast<nsIFontMetrics*>(mFontMetrics[i]);
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if (fm->Font().Equals(aFont)) {
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nsCOMPtr<nsIAtom> langGroup;
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fm->GetLangGroup(getter_AddRefs(langGroup));
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if (aLangGroup == langGroup.get()) {
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if (i != n) {
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// promote it to the end of the cache
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mFontMetrics.MoveElement(i, n);
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}
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NS_ADDREF(aMetrics = fm);
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return NS_OK;
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}
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}
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}
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// It's not in the cache. Get font metrics and then cache them.
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aMetrics = nsnull;
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nsresult rv = CreateFontMetricsInstance(&fm);
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if (NS_FAILED(rv)) return rv;
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rv = fm->Init(aFont, aLangGroup, mContext);
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if (NS_SUCCEEDED(rv)) {
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// the mFontMetrics list has the "head" at the end, because append is
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// cheaper than insert
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mFontMetrics.AppendElement(fm);
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aMetrics = fm;
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NS_ADDREF(aMetrics);
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return NS_OK;
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}
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fm->Destroy();
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NS_RELEASE(fm);
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// One reason why Init() fails is because the system is running out of resources.
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// e.g., on Win95/98 only a very limited number of GDI objects are available.
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// Compact the cache and try again.
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Compact();
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rv = CreateFontMetricsInstance(&fm);
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if (NS_FAILED(rv)) return rv;
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rv = fm->Init(aFont, aLangGroup, mContext);
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if (NS_SUCCEEDED(rv)) {
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mFontMetrics.AppendElement(fm);
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aMetrics = fm;
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NS_ADDREF(aMetrics);
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return NS_OK;
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}
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fm->Destroy();
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NS_RELEASE(fm);
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// 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 = static_cast<nsIFontMetrics*>(mFontMetrics[n]);
|
|
NS_ADDREF(aMetrics);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_POSTCONDITION(NS_SUCCEEDED(rv), "font metrics should not be null - bug 136248");
|
|
return rv;
|
|
}
|
|
|
|
/* PostScript module may override this method to create
|
|
* nsIFontMetrics objects with their own classes
|
|
*/
|
|
nsresult
|
|
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 = 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 = 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;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
DeviceContextImpl::PrepareNativeWidget(nsIWidget *aWidget, void **aOut)
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
DeviceContextImpl::ClearCachedSystemFonts()
|
|
{
|
|
return NS_OK;
|
|
}
|