gecko/gfx/thebes/gfxPlatformFontList.h
2012-05-21 12:12:37 +01:00

303 lines
11 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFXPLATFORMFONTLIST_H_
#define GFXPLATFORMFONTLIST_H_
#include "nsDataHashtable.h"
#include "nsRefPtrHashtable.h"
#include "nsTHashtable.h"
#include "gfxFontUtils.h"
#include "gfxFont.h"
#include "gfxPlatform.h"
#include "nsIMemoryReporter.h"
#include "mozilla/FunctionTimer.h"
class CharMapHashKey : public PLDHashEntryHdr
{
public:
typedef gfxCharacterMap* KeyType;
typedef const gfxCharacterMap* KeyTypePointer;
CharMapHashKey(const gfxCharacterMap *aCharMap) :
mCharMap(const_cast<gfxCharacterMap*>(aCharMap))
{
MOZ_COUNT_CTOR(CharMapHashKey);
}
CharMapHashKey(const CharMapHashKey& toCopy) :
mCharMap(toCopy.mCharMap)
{
MOZ_COUNT_CTOR(CharMapHashKey);
}
~CharMapHashKey()
{
MOZ_COUNT_DTOR(CharMapHashKey);
}
gfxCharacterMap* GetKey() const { return mCharMap; }
bool KeyEquals(const gfxCharacterMap *aCharMap) const {
NS_ASSERTION(!aCharMap->mBuildOnTheFly && !mCharMap->mBuildOnTheFly,
"custom cmap used in shared cmap hashtable");
// cmaps built on the fly never match
if (aCharMap->mHash != mCharMap->mHash)
{
return false;
}
return mCharMap->Equals(aCharMap);
}
static const gfxCharacterMap* KeyToPointer(gfxCharacterMap *aCharMap) {
return aCharMap;
}
static PLDHashNumber HashKey(const gfxCharacterMap *aCharMap) {
return aCharMap->mHash;
}
enum { ALLOW_MEMMOVE = true };
protected:
gfxCharacterMap *mCharMap;
};
// gfxPlatformFontList is an abstract class for the global font list on the system;
// concrete subclasses for each platform implement the actual interface to the system fonts.
// This class exists because we cannot rely on the platform font-finding APIs to behave
// in sensible/similar ways, particularly with rich, complex OpenType families,
// so we do our own font family/style management here instead.
// Much of this is based on the old gfxQuartzFontCache, but adapted for use on all platforms.
struct FontListSizes {
PRUint32 mFontListSize; // size of the font list and dependent objects
// (font family and face names, etc), but NOT
// including the font table cache and the cmaps
PRUint32 mFontTableCacheSize; // memory used for the gfxFontEntry table caches
PRUint32 mCharMapsSize; // memory used for cmap coverage info
};
class gfxPlatformFontList : protected gfxFontInfoLoader
{
public:
static gfxPlatformFontList* PlatformFontList() {
return sPlatformFontList;
}
static nsresult Init() {
NS_TIME_FUNCTION;
NS_ASSERTION(!sPlatformFontList, "What's this doing here?");
gfxPlatform::GetPlatform()->CreatePlatformFontList();
if (!sPlatformFontList) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
static void Shutdown() {
delete sPlatformFontList;
sPlatformFontList = nsnull;
}
virtual ~gfxPlatformFontList();
// initialize font lists
virtual nsresult InitFontList();
void GetFontList (nsIAtom *aLangGroup,
const nsACString& aGenericFamily,
nsTArray<nsString>& aListOfFonts);
virtual bool ResolveFontName(const nsAString& aFontName,
nsAString& aResolvedFontName);
void UpdateFontList() { InitFontList(); }
void ClearPrefFonts() { mPrefFonts.Clear(); }
virtual void GetFontFamilyList(nsTArray<nsRefPtr<gfxFontFamily> >& aFamilyArray);
virtual gfxFontEntry*
SystemFindFontForChar(const PRUint32 aCh,
PRInt32 aRunScript,
const gfxFontStyle* aStyle);
// TODO: make this virtual, for lazily adding to the font list
virtual gfxFontFamily* FindFamily(const nsAString& aFamily);
gfxFontEntry* FindFontForFamily(const nsAString& aFamily, const gfxFontStyle* aStyle, bool& aNeedsBold);
bool GetPrefFontFamilyEntries(eFontPrefLang aLangGroup, nsTArray<nsRefPtr<gfxFontFamily> > *array);
void SetPrefFontFamilyEntries(eFontPrefLang aLangGroup, nsTArray<nsRefPtr<gfxFontFamily> >& array);
// name lookup table methods
void AddOtherFamilyName(gfxFontFamily *aFamilyEntry, nsAString& aOtherFamilyName);
void AddFullname(gfxFontEntry *aFontEntry, nsAString& aFullname);
void AddPostscriptName(gfxFontEntry *aFontEntry, nsAString& aPostscriptName);
bool NeedFullnamePostscriptNames() { return mNeedFullnamePostscriptNames; }
// pure virtual functions, to be provided by concrete subclasses
// get the system default font
virtual gfxFontEntry* GetDefaultFont(const gfxFontStyle* aStyle,
bool& aNeedsBold) = 0;
// look up a font by name on the host platform
virtual gfxFontEntry* LookupLocalFont(const gfxProxyFontEntry *aProxyEntry,
const nsAString& aFontName) = 0;
// create a new platform font from downloaded data (@font-face)
// this method is responsible to ensure aFontData is NS_Free()'d
virtual gfxFontEntry* MakePlatformFont(const gfxProxyFontEntry *aProxyEntry,
const PRUint8 *aFontData,
PRUint32 aLength) = 0;
// get the standard family name on the platform for a given font name
// (platforms may override, eg Mac)
virtual bool GetStandardFamilyName(const nsAString& aFontName, nsAString& aFamilyName);
virtual void SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf,
FontListSizes* aSizes) const;
virtual void SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf,
FontListSizes* aSizes) const;
// search for existing cmap that matches the input
// return the input if no match is found
gfxCharacterMap* FindCharMap(gfxCharacterMap *aCmap);
// add a cmap to the shared cmap set
gfxCharacterMap* AddCmap(const gfxCharacterMap *aCharMap);
// remove the cmap from the shared cmap set
void RemoveCmap(const gfxCharacterMap *aCharMap);
protected:
class MemoryReporter
: public nsIMemoryMultiReporter
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIMEMORYMULTIREPORTER
};
gfxPlatformFontList(bool aNeedFullnamePostscriptNames = true);
static gfxPlatformFontList *sPlatformFontList;
static PLDHashOperator FindFontForCharProc(nsStringHashKey::KeyType aKey,
nsRefPtr<gfxFontFamily>& aFamilyEntry,
void* userArg);
// returns default font for a given character, null otherwise
virtual gfxFontEntry* CommonFontFallback(const PRUint32 aCh,
PRInt32 aRunScript,
const gfxFontStyle* aMatchStyle);
// search fonts system-wide for a given character, null otherwise
virtual gfxFontEntry* GlobalFontFallback(const PRUint32 aCh,
PRInt32 aRunScript,
const gfxFontStyle* aMatchStyle,
PRUint32& aCmapCount);
// whether system-based font fallback is used or not
// if system fallback is used, no need to load all cmaps
virtual bool UsesSystemFallback() { return false; }
// separate initialization for reading in name tables, since this is expensive
void InitOtherFamilyNames();
static PLDHashOperator InitOtherFamilyNamesProc(nsStringHashKey::KeyType aKey,
nsRefPtr<gfxFontFamily>& aFamilyEntry,
void* userArg);
// read in all fullname/Postscript names for all font faces
void InitFaceNameLists();
static PLDHashOperator InitFaceNameListsProc(nsStringHashKey::KeyType aKey,
nsRefPtr<gfxFontFamily>& aFamilyEntry,
void* userArg);
// commonly used fonts for which the name table should be loaded at startup
virtual void PreloadNamesList();
// load the bad underline blacklist from pref.
void LoadBadUnderlineList();
// explicitly set fixed-pitch flag for all faces
void SetFixedPitch(const nsAString& aFamilyName);
void GenerateFontListKey(const nsAString& aKeyName, nsAString& aResult);
static PLDHashOperator
HashEnumFuncForFamilies(nsStringHashKey::KeyType aKey,
nsRefPtr<gfxFontFamily>& aFamilyEntry,
void* aUserArg);
// gfxFontInfoLoader overrides, used to load in font cmaps
virtual void InitLoader();
virtual bool RunLoader();
virtual void FinishLoader();
// used by memory reporter to accumulate sizes of family names in the hash
static size_t
SizeOfFamilyNameEntryExcludingThis(const nsAString& aKey,
const nsRefPtr<gfxFontFamily>& aFamily,
nsMallocSizeOfFun aMallocSizeOf,
void* aUserArg);
// canonical family name ==> family entry (unique, one name per family entry)
nsRefPtrHashtable<nsStringHashKey, gfxFontFamily> mFontFamilies;
// other family name ==> family entry (not unique, can have multiple names per
// family entry, only names *other* than the canonical names are stored here)
nsRefPtrHashtable<nsStringHashKey, gfxFontFamily> mOtherFamilyNames;
// flag set after InitOtherFamilyNames is called upon first name lookup miss
bool mOtherFamilyNamesInitialized;
// flag set after fullname and Postcript name lists are populated
bool mFaceNamesInitialized;
// whether these are needed for a given platform
bool mNeedFullnamePostscriptNames;
// fullname ==> font entry (unique, one name per font entry)
nsRefPtrHashtable<nsStringHashKey, gfxFontEntry> mFullnames;
// Postscript name ==> font entry (unique, one name per font entry)
nsRefPtrHashtable<nsStringHashKey, gfxFontEntry> mPostscriptNames;
// cached pref font lists
// maps list of family names ==> array of family entries, one per lang group
nsDataHashtable<nsUint32HashKey, nsTArray<nsRefPtr<gfxFontFamily> > > mPrefFonts;
// when system-wide font lookup fails for a character, cache it to skip future searches
gfxSparseBitSet mCodepointsWithNoFonts;
// the family to use for U+FFFD fallback, to avoid expensive search every time
// on pages with lots of problems
nsString mReplacementCharFallbackFamily;
nsTHashtable<nsStringHashKey> mBadUnderlineFamilyNames;
// character map data shared across families
// contains weak ptrs to cmaps shared by font entry objects
nsTHashtable<CharMapHashKey> mSharedCmaps;
// data used as part of the font cmap loading process
nsTArray<nsRefPtr<gfxFontFamily> > mFontFamiliesToLoad;
PRUint32 mStartIndex;
PRUint32 mIncrement;
PRUint32 mNumFamilies;
};
#endif /* GFXPLATFORMFONTLIST_H_ */