зеркало из https://github.com/mozilla/gecko-dev.git
407 строки
14 KiB
C++
407 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFXFCPLATFORMFONTLIST_H_
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#define GFXFCPLATFORMFONTLIST_H_
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#include "gfxFont.h"
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#include "gfxFontEntry.h"
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#include "gfxFT2FontBase.h"
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#include "gfxPlatformFontList.h"
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#include "mozilla/FontPropertyTypes.h"
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#include "mozilla/mozalloc.h"
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#include "nsAutoRef.h"
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#include "nsClassHashtable.h"
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#include <fontconfig/fontconfig.h>
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#include "ft2build.h"
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#include FT_FREETYPE_H
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#include FT_TRUETYPE_TABLES_H
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#include FT_MULTIPLE_MASTERS_H
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#include <cairo.h>
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#include <cairo-ft.h>
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#ifdef MOZ_CONTENT_SANDBOX
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#include "mozilla/SandboxBroker.h"
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#endif
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namespace mozilla {
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namespace dom {
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class SystemFontListEntry;
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};
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};
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template <>
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class nsAutoRefTraits<FcPattern> : public nsPointerRefTraits<FcPattern>
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{
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public:
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static void Release(FcPattern *ptr) { FcPatternDestroy(ptr); }
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static void AddRef(FcPattern *ptr) { FcPatternReference(ptr); }
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};
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template <>
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class nsAutoRefTraits<FcConfig> : public nsPointerRefTraits<FcConfig>
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{
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public:
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static void Release(FcConfig *ptr) { FcConfigDestroy(ptr); }
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static void AddRef(FcConfig *ptr) { FcConfigReference(ptr); }
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};
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// Helper classes used for clearning out user font data when cairo font
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// face is destroyed. Since multiple faces may use the same data, be
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// careful to assure that the data is only cleared out when all uses
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// expire. The font entry object contains a refptr to FTUserFontData and
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// each cairo font created from that font entry contains a
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// FTUserFontDataRef with a refptr to that same FTUserFontData object.
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class FTUserFontData {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FTUserFontData)
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explicit FTUserFontData(FT_Face aFace, const uint8_t* aData)
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: mFace(aFace), mFontData(aData)
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{
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}
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const uint8_t *FontData() const { return mFontData; }
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private:
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~FTUserFontData()
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{
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mozilla::gfx::Factory::ReleaseFTFace(mFace);
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if (mFontData) {
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free((void*)mFontData);
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}
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}
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FT_Face mFace;
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const uint8_t *mFontData;
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};
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// The names for the font entry and font classes should really
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// the common 'Fc' abbreviation but the gfxPangoFontGroup code already
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// defines versions of these, so use the verbose name for now.
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class gfxFontconfigFontEntry : public gfxFontEntry {
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public:
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// used for system fonts with explicit patterns
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explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
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FcPattern* aFontPattern,
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bool aIgnoreFcCharmap);
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// used for data fonts where the fontentry takes ownership
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// of the font data and the FT_Face
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explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
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WeightRange aWeight,
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StretchRange aStretch,
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SlantStyleRange aStyle,
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const uint8_t *aData,
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uint32_t aLength,
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FT_Face aFace);
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// used for @font-face local system fonts with explicit patterns
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explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
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FcPattern* aFontPattern,
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WeightRange aWeight,
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StretchRange aStretch,
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SlantStyleRange aStyle);
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gfxFontEntry* Clone() const override;
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FcPattern* GetPattern() { return mFontPattern; }
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nsresult ReadCMAP(FontInfoData *aFontInfoData = nullptr) override;
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bool TestCharacterMap(uint32_t aCh) override;
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FT_Face GetFTFace();
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FT_MM_Var* GetMMVar();
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bool HasVariations() override;
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void GetVariationAxes(nsTArray<gfxFontVariationAxis>& aAxes) override;
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void GetVariationInstances(nsTArray<gfxFontVariationInstance>& aInstances) override;
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hb_blob_t* GetFontTable(uint32_t aTableTag) override;
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void ForgetHBFace() override;
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void ReleaseGrFace(gr_face* aFace) override;
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double GetAspect();
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protected:
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virtual ~gfxFontconfigFontEntry();
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gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle) override;
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// helper method for creating cairo font from pattern
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cairo_scaled_font_t*
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CreateScaledFont(FcPattern* aRenderPattern,
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gfxFloat aAdjustedSize,
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const gfxFontStyle *aStyle);
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// override to pull data from FTFace
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virtual nsresult
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CopyFontTable(uint32_t aTableTag,
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nsTArray<uint8_t>& aBuffer) override;
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// if HB or GR faces are gone, close down the FT_Face
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void MaybeReleaseFTFace();
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// pattern for a single face of a family
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nsCountedRef<FcPattern> mFontPattern;
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// user font data, when needed
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RefPtr<FTUserFontData> mUserFontData;
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// FTFace - initialized when needed
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FT_Face mFTFace;
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bool mFTFaceInitialized;
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// Whether TestCharacterMap should check the actual cmap rather than asking
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// fontconfig about character coverage.
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// We do this for app-bundled (rather than system) fonts, as they may
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// include color glyphs that fontconfig would overlook, and for fonts
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// loaded via @font-face.
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bool mIgnoreFcCharmap;
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// Whether the face supports variations. For system-installed fonts, we
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// query fontconfig for this (so they will only work if fontconfig is
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// recent enough to include support); for downloaded user-fonts we query
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// the FreeType face.
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bool mHasVariations;
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bool mHasVariationsInitialized;
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double mAspect;
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// data font
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const uint8_t* mFontData;
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uint32_t mLength;
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class UnscaledFontCache
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{
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public:
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already_AddRefed<mozilla::gfx::UnscaledFontFontconfig>
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Lookup(const char* aFile, uint32_t aIndex);
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void Add(const RefPtr<mozilla::gfx::UnscaledFontFontconfig>& aUnscaledFont) {
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mUnscaledFonts[kNumEntries-1] = aUnscaledFont;
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MoveToFront(kNumEntries-1);
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}
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private:
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void MoveToFront(size_t aIndex);
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static const size_t kNumEntries = 3;
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mozilla::ThreadSafeWeakPtr<mozilla::gfx::UnscaledFontFontconfig> mUnscaledFonts[kNumEntries];
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};
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UnscaledFontCache mUnscaledFontCache;
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// Because of FreeType bug 52955, we keep the FT_MM_Var struct when it is
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// first loaded, rather than releasing it and re-fetching it as needed.
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FT_MM_Var* mMMVar = nullptr;
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bool mMMVarInitialized = false;
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};
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class gfxFontconfigFontFamily : public gfxFontFamily {
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public:
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explicit gfxFontconfigFontFamily(const nsAString& aName) :
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gfxFontFamily(aName),
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mContainsAppFonts(false),
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mHasNonScalableFaces(false),
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mForceScalable(false)
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{ }
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template<typename Func>
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void AddFacesToFontList(Func aAddPatternFunc);
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void FindStyleVariations(FontInfoData *aFontInfoData = nullptr) override;
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// Families are constructed initially with just references to patterns.
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// When necessary, these are enumerated within FindStyleVariations.
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void AddFontPattern(FcPattern* aFontPattern);
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void SetFamilyContainsAppFonts(bool aContainsAppFonts)
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{
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mContainsAppFonts = aContainsAppFonts;
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}
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void
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FindAllFontsForStyle(const gfxFontStyle& aFontStyle,
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nsTArray<gfxFontEntry*>& aFontEntryList,
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bool aIgnoreSizeTolerance) override;
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bool FilterForFontList(nsAtom* aLangGroup,
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const nsACString& aGeneric) const final {
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return SupportsLangGroup(aLangGroup);
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}
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protected:
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virtual ~gfxFontconfigFontFamily();
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// helper for FilterForFontList
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bool SupportsLangGroup(nsAtom *aLangGroup) const;
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nsTArray<nsCountedRef<FcPattern> > mFontPatterns;
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bool mContainsAppFonts;
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bool mHasNonScalableFaces;
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bool mForceScalable;
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};
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class gfxFontconfigFont : public gfxFT2FontBase {
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public:
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gfxFontconfigFont(const RefPtr<mozilla::gfx::UnscaledFontFontconfig> &aUnscaledFont,
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cairo_scaled_font_t *aScaledFont,
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FcPattern *aPattern,
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gfxFloat aAdjustedSize,
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gfxFontEntry *aFontEntry,
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const gfxFontStyle *aFontStyle);
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virtual FontType GetType() const override { return FONT_TYPE_FONTCONFIG; }
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virtual FcPattern *GetPattern() const { return mPattern; }
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virtual already_AddRefed<mozilla::gfx::ScaledFont>
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GetScaledFont(DrawTarget *aTarget) override;
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private:
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virtual ~gfxFontconfigFont();
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nsCountedRef<FcPattern> mPattern;
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};
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class gfxFcPlatformFontList : public gfxPlatformFontList {
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public:
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gfxFcPlatformFontList();
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static gfxFcPlatformFontList* PlatformFontList() {
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return static_cast<gfxFcPlatformFontList*>(sPlatformFontList);
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}
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// initialize font lists
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virtual nsresult InitFontListForPlatform() override;
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void GetFontList(nsAtom *aLangGroup,
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const nsACString& aGenericFamily,
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nsTArray<nsString>& aListOfFonts) override;
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void ReadSystemFontList(
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InfallibleTArray<mozilla::dom::SystemFontListEntry>* retValue);
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gfxFontEntry*
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LookupLocalFont(const nsAString& aFontName,
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WeightRange aWeightForEntry,
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StretchRange aStretchForEntry,
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SlantStyleRange aStyleForEntry) override;
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gfxFontEntry*
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MakePlatformFont(const nsAString& aFontName,
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WeightRange aWeightForEntry,
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StretchRange aStretchForEntry,
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SlantStyleRange aStyleForEntry,
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const uint8_t* aFontData,
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uint32_t aLength) override;
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bool FindAndAddFamilies(const nsAString& aFamily,
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nsTArray<gfxFontFamily*>* aOutput,
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FindFamiliesFlags aFlags,
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gfxFontStyle* aStyle = nullptr,
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gfxFloat aDevToCssSize = 1.0) override;
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bool GetStandardFamilyName(const nsAString& aFontName,
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nsAString& aFamilyName) override;
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FcConfig* GetLastConfig() const { return mLastConfig; }
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// override to use fontconfig lookup for generics
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void AddGenericFonts(mozilla::FontFamilyType aGenericType,
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nsAtom* aLanguage,
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nsTArray<gfxFontFamily*>& aFamilyList) override;
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void ClearLangGroupPrefFonts() override;
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// clear out cached generic-lang ==> family-list mappings
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void ClearGenericMappings() {
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mGenericMappings.Clear();
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}
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static FT_Library GetFTLibrary();
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protected:
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virtual ~gfxFcPlatformFontList();
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#ifdef MOZ_CONTENT_SANDBOX
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typedef mozilla::SandboxBroker::Policy SandboxPolicy;
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#else
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// Dummy type just so we can still have a SandboxPolicy* parameter.
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struct SandboxPolicy {};
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#endif
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// Add all the font families found in a font set.
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// aAppFonts indicates whether this is the system or application fontset.
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void AddFontSetFamilies(FcFontSet* aFontSet, const SandboxPolicy* aPolicy,
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bool aAppFonts);
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// Helper for above, to add a single font pattern.
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void AddPatternToFontList(FcPattern* aFont, FcChar8*& aLastFamilyName,
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nsAString& aFamilyName,
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RefPtr<gfxFontconfigFontFamily>& aFontFamily,
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bool aAppFonts);
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// figure out which families fontconfig maps a generic to
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// (aGeneric assumed already lowercase)
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PrefFontList* FindGenericFamilies(const nsAString& aGeneric,
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nsAtom* aLanguage);
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// are all pref font settings set to use fontconfig generics?
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bool PrefFontListsUseOnlyGenerics();
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static void CheckFontUpdates(nsITimer *aTimer, void *aThis);
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virtual gfxFontFamily*
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GetDefaultFontForPlatform(const gfxFontStyle* aStyle) override;
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gfxFontFamily* CreateFontFamily(const nsAString& aName) const override;
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#ifdef MOZ_BUNDLED_FONTS
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void ActivateBundledFonts();
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nsCString mBundledFontsPath;
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bool mBundledFontsInitialized;
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#endif
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// to avoid enumerating all fonts, maintain a mapping of local font
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// names to family
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nsBaseHashtable<nsStringHashKey,
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nsCountedRef<FcPattern>,
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FcPattern*> mLocalNames;
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// caching generic/lang ==> font family list
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nsClassHashtable<nsCStringHashKey,
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PrefFontList> mGenericMappings;
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// Caching family lookups as found by FindAndAddFamilies after resolving
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// substitutions. The gfxFontFamily objects cached here are owned by the
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// gfxFcPlatformFontList via its mFamilies table; note that if the main
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// font list is rebuilt (e.g. due to a fontconfig configuration change),
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// these pointers will be invalidated. InitFontList() flushes the cache
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// in this case.
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nsDataHashtable<nsCStringHashKey,
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nsTArray<gfxFontFamily*>> mFcSubstituteCache;
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nsCOMPtr<nsITimer> mCheckFontUpdatesTimer;
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nsCountedRef<FcConfig> mLastConfig;
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// By default, font prefs under Linux are set to simply lookup
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// via fontconfig the appropriate font for serif/sans-serif/monospace.
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// Rather than check each time a font pref is used, check them all at startup
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// and set a boolean to flag the case that non-default user font prefs exist
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// Note: langGroup == x-math is handled separately
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bool mAlwaysUseFontconfigGenerics;
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static FT_Library sCairoFTLibrary;
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};
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#endif /* GFXPLATFORMFONTLIST_H_ */
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