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184 lines
6.9 KiB
C++
184 lines
6.9 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com>
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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#ifndef GFX_TEXT_RUN_CACHE_H
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#define GFX_TEXT_RUN_CACHE_H
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#include "nsRefPtrHashtable.h"
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#include "nsClassHashtable.h"
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#include "gfxFont.h"
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#include "prtime.h"
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class THEBES_API gfxTextRunCache {
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public:
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/*
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* Get the global gfxTextRunCache. You must call Init() before
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* calling this method.
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*/
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static gfxTextRunCache* GetCache() {
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return mGlobalCache;
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}
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static nsresult Init();
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static void Shutdown();
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/* Will return a pointer to a gfxTextRun, which may or may not be from
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* the cache. If aCallerOwns is set to true, the caller owns the textrun
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* and must delete it. Otherwise the returned textrun is only valid until
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* the next GetOrMakeTextRun call and the caller must not delete it.
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*/
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gfxTextRun *GetOrMakeTextRun (gfxContext* aContext, gfxFontGroup *aFontGroup,
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const char *aString, PRUint32 aLength,
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PRUint32 aAppUnitsPerDevUnit, PRBool aIsRTL,
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PRBool aEnableSpacing, PRBool *aCallerOwns);
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gfxTextRun *GetOrMakeTextRun (gfxContext* aContext, gfxFontGroup *aFontGroup,
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const PRUnichar *aString, PRUint32 aLength,
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PRUint32 aAppUnitsPerDevUnit, PRBool aIsRTL,
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PRBool aEnableSpacing, PRBool *aCallerOwns);
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protected:
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gfxTextRunCache();
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static gfxTextRunCache *mGlobalCache;
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static PRInt32 mGlobalCacheRefCount;
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/* A small container class to hold a gfxFontGroup ref and a string.
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* This is used as the key for the cache hash table; to avoid
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* copying a whole pile of strings every time we do a hash lookup.
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* we only create our own copy of the string when Realize() is called.
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* gfxTextRunCache calls Realize whenever it puts a new entry into
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* the hashtable.
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*/
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template<class GenericString, class RealString>
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struct FontGroupAndStringT {
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FontGroupAndStringT(gfxFontGroup *fg, const GenericString* str)
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: mFontGroup(fg), mString(str) { }
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FontGroupAndStringT(const FontGroupAndStringT<GenericString,RealString>& other)
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: mFontGroup(other.mFontGroup), mString(&mRealString)
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{
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mRealString.Assign(*other.mString);
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}
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void Realize() {
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mRealString.Assign(*mString);
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mString = &mRealString;
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}
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nsRefPtr<gfxFontGroup> mFontGroup;
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RealString mRealString;
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const GenericString* mString;
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};
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static PRUint32 HashDouble(const double d) {
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if (d == 0.0)
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return 0;
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int exponent;
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double mantissa = frexp (d, &exponent);
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return (PRUint32) (2 * fabs(mantissa) - 1);
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}
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template<class T>
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struct FontGroupAndStringHashKeyT : public PLDHashEntryHdr {
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typedef const T& KeyType;
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typedef const T* KeyTypePointer;
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FontGroupAndStringHashKeyT(KeyTypePointer aObj) : mObj(*aObj) { }
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FontGroupAndStringHashKeyT(const FontGroupAndStringHashKeyT<T>& other) : mObj(other.mObj) { }
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~FontGroupAndStringHashKeyT() { }
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KeyType GetKey() const { return mObj; }
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PRBool KeyEquals(KeyTypePointer aKey) const {
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return
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mObj.mString->Equals(*(aKey->mString)) &&
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mObj.mFontGroup->Equals(*(aKey->mFontGroup.get()));
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}
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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PRUint32 h1 = HashString(*(aKey->mString));
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PRUint32 h2 = HashString(aKey->mFontGroup->GetFamilies());
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PRUint32 h3 = HashDouble(aKey->mFontGroup->GetStyle()->size);
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return h1 ^ h2 ^ h3;
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}
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enum { ALLOW_MEMMOVE = PR_FALSE };
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private:
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const T mObj;
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};
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struct TextRunEntry {
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TextRunEntry(gfxTextRun *tr) : textRun(tr), lastUse(PR_Now()) { }
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void Used() { lastUse = PR_Now(); }
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gfxTextRun* textRun;
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PRTime lastUse;
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~TextRunEntry() { delete textRun; }
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};
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typedef FontGroupAndStringT<nsAString, nsString> FontGroupAndString;
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typedef FontGroupAndStringT<nsACString, nsCString> FontGroupAndCString;
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typedef FontGroupAndStringHashKeyT<FontGroupAndString> FontGroupAndStringHashKey;
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typedef FontGroupAndStringHashKeyT<FontGroupAndCString> FontGroupAndCStringHashKey;
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nsClassHashtable<FontGroupAndStringHashKey, TextRunEntry> mHashTableUTF16;
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nsClassHashtable<FontGroupAndCStringHashKey, TextRunEntry> mHashTableASCII;
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void EvictUTF16();
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void EvictASCII();
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PRTime mLastUTF16Eviction;
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PRTime mLastASCIIEviction;
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static PLDHashOperator UTF16EvictEnumerator(const FontGroupAndString& key,
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nsAutoPtr<TextRunEntry> &value,
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void *closure);
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static PLDHashOperator ASCIIEvictEnumerator(const FontGroupAndCString& key,
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nsAutoPtr<TextRunEntry> &value,
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void *closure);
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};
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#endif /* GFX_TEXT_RUN_CACHE_H */
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