gecko-dev/gfx/thebes/gfxFcPlatformFontList.h

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/* -*- 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 GFXFCPLATFORMFONTLIST_H_
#define GFXFCPLATFORMFONTLIST_H_
#include "gfxFont.h"
#include "gfxFontEntry.h"
#include "gfxFT2FontBase.h"
#include "gfxPlatformFontList.h"
#include "mozilla/mozalloc.h"
#include "nsClassHashtable.h"
#include <fontconfig/fontconfig.h>
#include "ft2build.h"
#include FT_FREETYPE_H
#include FT_TRUETYPE_TABLES_H
#include <cairo.h>
#include <cairo-ft.h>
#include "gfxFontconfigUtils.h" // xxx - only for nsAutoRefTraits<FcPattern>, etc.
template <>
class nsAutoRefTraits<FcObjectSet> : public nsPointerRefTraits<FcObjectSet>
{
public:
static void Release(FcObjectSet *ptr) { FcObjectSetDestroy(ptr); }
};
template <>
class nsAutoRefTraits<FcConfig> : public nsPointerRefTraits<FcConfig>
{
public:
static void Release(FcConfig *ptr) { FcConfigDestroy(ptr); }
static void AddRef(FcConfig *ptr) { FcConfigReference(ptr); }
};
// Helper classes used for clearning out user font data when cairo font
// face is destroyed. Since multiple faces may use the same data, be
// careful to assure that the data is only cleared out when all uses
// expire. The font entry object contains a refptr to FTUserFontData and
// each cairo font created from that font entry contains a
// FTUserFontDataRef with a refptr to that same FTUserFontData object.
class FTUserFontData {
public:
NS_INLINE_DECL_REFCOUNTING(FTUserFontData)
explicit FTUserFontData(FT_Face aFace, const uint8_t* aData)
: mFace(aFace), mFontData(aData)
{
}
const uint8_t *FontData() const { return mFontData; }
private:
~FTUserFontData()
{
FT_Done_Face(mFace);
if (mFontData) {
NS_Free((void*)mFontData);
}
}
FT_Face mFace;
const uint8_t *mFontData;
};
class FTUserFontDataRef {
public:
explicit FTUserFontDataRef(FTUserFontData *aUserFontData)
: mUserFontData(aUserFontData)
{
}
static void Destroy(void* aData) {
FTUserFontDataRef* aUserFontDataRef =
static_cast<FTUserFontDataRef*>(aData);
delete aUserFontDataRef;
}
private:
RefPtr<FTUserFontData> mUserFontData;
};
// The names for the font entry and font classes should really
// the common 'Fc' abbreviation but the gfxPangoFontGroup code already
// defines versions of these, so use the verbose name for now.
class gfxFontconfigFontEntry : public gfxFontEntry {
public:
// used for system fonts with explicit patterns
explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
FcPattern* aFontPattern,
bool aIgnoreFcCharmap);
// used for data fonts where the fontentry takes ownership
// of the font data and the FT_Face
explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
uint16_t aWeight,
int16_t aStretch,
uint8_t aStyle,
const uint8_t *aData,
FT_Face aFace);
// used for @font-face local system fonts with explicit patterns
explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
FcPattern* aFontPattern,
uint16_t aWeight,
int16_t aStretch,
uint8_t aStyle);
FcPattern* GetPattern() { return mFontPattern; }
bool SupportsLangGroup(nsIAtom *aLangGroup) const override;
nsresult ReadCMAP(FontInfoData *aFontInfoData = nullptr) override;
bool TestCharacterMap(uint32_t aCh) override;
hb_blob_t* GetFontTable(uint32_t aTableTag) override;
void ForgetHBFace() override;
void ReleaseGrFace(gr_face* aFace) override;
protected:
virtual ~gfxFontconfigFontEntry();
gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle,
bool aNeedsBold) override;
// helper method for creating cairo font from pattern
cairo_scaled_font_t*
CreateScaledFont(FcPattern* aRenderPattern,
const gfxFontStyle *aStyle,
bool aNeedsBold);
// override to pull data from FTFace
virtual nsresult
CopyFontTable(uint32_t aTableTag,
nsTArray<uint8_t>& aBuffer) override;
// if HB or GR faces are gone, close down the FT_Face
void MaybeReleaseFTFace();
double GetAspect();
// pattern for a single face of a family
nsCountedRef<FcPattern> mFontPattern;
// user font data, when needed
RefPtr<FTUserFontData> mUserFontData;
// FTFace - initialized when needed
FT_Face mFTFace;
bool mFTFaceInitialized;
// Whether TestCharacterMap should check the actual cmap rather than asking
// fontconfig about character coverage.
// We do this for app-bundled (rather than system) fonts, as they may
// include color glyphs that fontconfig would overlook, and for fonts
// loaded via @font-face.
bool mIgnoreFcCharmap;
double mAspect;
// data font
const uint8_t* mFontData;
};
class gfxFontconfigFontFamily : public gfxFontFamily {
public:
explicit gfxFontconfigFontFamily(const nsAString& aName) :
gfxFontFamily(aName),
mContainsAppFonts(false)
{ }
void FindStyleVariations(FontInfoData *aFontInfoData = nullptr) override;
// Families are constructed initially with just references to patterns.
// When necessary, these are enumerated within FindStyleVariations.
void AddFontPattern(FcPattern* aFontPattern);
void SetFamilyContainsAppFonts(bool aContainsAppFonts)
{
mContainsAppFonts = aContainsAppFonts;
}
protected:
virtual ~gfxFontconfigFontFamily() { }
nsTArray<nsCountedRef<FcPattern> > mFontPatterns;
bool mContainsAppFonts;
};
class gfxFontconfigFont : public gfxFontconfigFontBase {
public:
gfxFontconfigFont(cairo_scaled_font_t *aScaledFont,
FcPattern *aPattern,
gfxFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
bool aNeedsBold);
protected:
virtual ~gfxFontconfigFont();
};
class nsILanguageAtomService;
class gfxFcPlatformFontList : public gfxPlatformFontList {
public:
gfxFcPlatformFontList();
static gfxFcPlatformFontList* PlatformFontList() {
return static_cast<gfxFcPlatformFontList*>(sPlatformFontList);
}
// initialize font lists
virtual nsresult InitFontListForPlatform() override;
void GetFontList(nsIAtom *aLangGroup,
const nsACString& aGenericFamily,
nsTArray<nsString>& aListOfFonts) override;
gfxFontEntry*
LookupLocalFont(const nsAString& aFontName, uint16_t aWeight,
int16_t aStretch, uint8_t aStyle) override;
gfxFontEntry*
MakePlatformFont(const nsAString& aFontName, uint16_t aWeight,
int16_t aStretch,
uint8_t aStyle,
const uint8_t* aFontData,
uint32_t aLength) override;
bool FindAndAddFamilies(const nsAString& aFamily,
nsTArray<gfxFontFamily*>* aOutput,
gfxFontStyle* aStyle = nullptr,
gfxFloat aDevToCssSize = 1.0) override;
bool GetStandardFamilyName(const nsAString& aFontName,
nsAString& aFamilyName) override;
FcConfig* GetLastConfig() const { return mLastConfig; }
// override to use fontconfig lookup for generics
void AddGenericFonts(mozilla::FontFamilyType aGenericType,
nsIAtom* aLanguage,
nsTArray<gfxFontFamily*>& aFamilyList) override;
void ClearLangGroupPrefFonts() override;
// clear out cached generic-lang ==> family-list mappings
void ClearGenericMappings() {
mGenericMappings.Clear();
}
static FT_Library GetFTLibrary();
protected:
virtual ~gfxFcPlatformFontList();
// Add all the font families found in a font set.
// aAppFonts indicates whether this is the system or application fontset.
void AddFontSetFamilies(FcFontSet* aFontSet, bool aAppFonts);
// figure out which families fontconfig maps a generic to
// (aGeneric assumed already lowercase)
PrefFontList* FindGenericFamilies(const nsAString& aGeneric,
nsIAtom* aLanguage);
// are all pref font settings set to use fontconfig generics?
bool PrefFontListsUseOnlyGenerics();
static void CheckFontUpdates(nsITimer *aTimer, void *aThis);
virtual gfxFontFamily*
GetDefaultFontForPlatform(const gfxFontStyle* aStyle) override;
#ifdef MOZ_BUNDLED_FONTS
void ActivateBundledFonts();
nsCString mBundledFontsPath;
bool mBundledFontsInitialized;
#endif
// to avoid enumerating all fonts, maintain a mapping of local font
// names to family
nsBaseHashtable<nsStringHashKey,
nsCountedRef<FcPattern>,
FcPattern*> mLocalNames;
// caching generic/lang ==> font family list
nsClassHashtable<nsCStringHashKey,
PrefFontList> mGenericMappings;
// Caching family lookups as found by FindAndAddFamilies after resolving
// substitutions. The gfxFontFamily objects cached here are owned by the
// gfxFcPlatformFontList via its mFamilies table; note that if the main
// font list is rebuilt (e.g. due to a fontconfig configuration change),
// these pointers will be invalidated. InitFontList() flushes the cache
// in this case.
nsDataHashtable<nsCStringHashKey,
nsTArray<gfxFontFamily*>> mFcSubstituteCache;
nsCOMPtr<nsITimer> mCheckFontUpdatesTimer;
nsCountedRef<FcConfig> mLastConfig;
// By default, font prefs under Linux are set to simply lookup
// via fontconfig the appropriate font for serif/sans-serif/monospace.
// Rather than check each time a font pref is used, check them all at startup
// and set a boolean to flag the case that non-default user font prefs exist
// Note: langGroup == x-math is handled separately
bool mAlwaysUseFontconfigGenerics;
static FT_Library sCairoFTLibrary;
};
#endif /* GFXPLATFORMFONTLIST_H_ */