The Tor Browser: gfx/thebes/gfxGDIFontList.h@97036ab72558 (annotated)

gfx/thebes/gfxGDIFontList.h@97036ab72558 (annotated)

gfx/thebes/gfxGDIFontList.h

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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 GFX_GDIFONTLIST_H
 #define GFX_GDIFONTLIST_H
 #include "mozilla/MemoryReporting.h"
 #include "gfxWindowsPlatform.h"
 #include "gfxPlatformFontList.h"
 #include "nsGkAtoms.h"
 #include <windows.h>
 class AutoDC // get the global device context, and auto-release it on destruction
 {
 public:
     AutoDC() {
         mDC = ::GetDC(nullptr);
     }
     ~AutoDC() {
         ::ReleaseDC(nullptr, mDC);
     }
     HDC GetDC() {
         return mDC;
     }
 private:
     HDC mDC;
 };
 class AutoSelectFont // select a font into the given DC, and auto-restore
 {
 public:
     AutoSelectFont(HDC aDC, LOGFONTW *aLogFont)
         : mOwnsFont(false)
     {
         mFont = ::CreateFontIndirectW(aLogFont);
         if (mFont) {
             mOwnsFont = true;
             mDC = aDC;
             mOldFont = (HFONT)::SelectObject(aDC, mFont);
         } else {
             mOldFont = nullptr;
         }
     }
     AutoSelectFont(HDC aDC, HFONT aFont)
         : mOwnsFont(false)
     {
         mDC = aDC;
         mFont = aFont;
         mOldFont = (HFONT)::SelectObject(aDC, aFont);
     }
     ~AutoSelectFont() {
         if (mOldFont) {
             ::SelectObject(mDC, mOldFont);
             if (mOwnsFont) {
                 ::DeleteObject(mFont);
             }
         }
     }
     bool IsValid() const {
         return mFont != nullptr;
     }
     HFONT GetFont() const {
         return mFont;
     }
 private:
     HDC    mDC;
     HFONT  mFont;
     HFONT  mOldFont;
     bool mOwnsFont;
 };
 /**
  * List of different types of fonts we support on Windows.
  * These can generally be lumped in to 3 categories where we have to
  * do special things:  Really old fonts bitmap and vector fonts (device
  * and raster), Type 1 fonts, and TrueType/OpenType fonts.
  *
  * This list is sorted in order from least prefered to most prefered.
  * We prefer Type1 fonts over OpenType fonts to avoid falling back to
  * things like Arial (opentype) when you ask for Helvetica (type1)
  **/
 enum gfxWindowsFontType {
     GFX_FONT_TYPE_UNKNOWN = 0,
     GFX_FONT_TYPE_DEVICE,
     GFX_FONT_TYPE_RASTER,
     GFX_FONT_TYPE_TRUETYPE,
     GFX_FONT_TYPE_PS_OPENTYPE,
     GFX_FONT_TYPE_TT_OPENTYPE,
     GFX_FONT_TYPE_TYPE1
 };
 // A single member of a font family (i.e. a single face, such as Times Italic)
 // represented as a LOGFONT that will resolve to the correct face.
 // This replaces FontEntry from gfxWindowsFonts.h/cpp.
 class GDIFontEntry : public gfxFontEntry
 {
 public:
     LPLOGFONTW GetLogFont() { return &mLogFont; }
     nsresult ReadCMAP(FontInfoData *aFontInfoData = nullptr);
     virtual bool IsSymbolFont();
     void FillLogFont(LOGFONTW *aLogFont, uint16_t aWeight, gfxFloat aSize,
                      bool aUseCleartype);
     static gfxWindowsFontType DetermineFontType(const NEWTEXTMETRICW& metrics,
                                                 DWORD fontType)
     {
         gfxWindowsFontType feType;
         if (metrics.ntmFlags & NTM_TYPE1)
             feType = GFX_FONT_TYPE_TYPE1;
         else if (metrics.ntmFlags & NTM_PS_OPENTYPE)
             feType = GFX_FONT_TYPE_PS_OPENTYPE;
         else if (metrics.ntmFlags & NTM_TT_OPENTYPE)
             feType = GFX_FONT_TYPE_TT_OPENTYPE;
         else if (fontType == TRUETYPE_FONTTYPE)
             feType = GFX_FONT_TYPE_TRUETYPE;
         else if (fontType == RASTER_FONTTYPE)
             feType = GFX_FONT_TYPE_RASTER;
         else if (fontType == DEVICE_FONTTYPE)
             feType = GFX_FONT_TYPE_DEVICE;
         else
             feType = GFX_FONT_TYPE_UNKNOWN;
         return feType;
     }
     bool IsType1() const {
         return (mFontType == GFX_FONT_TYPE_TYPE1);
     }
     bool IsTrueType() const {
         return (mFontType == GFX_FONT_TYPE_TRUETYPE ||
                 mFontType == GFX_FONT_TYPE_PS_OPENTYPE ||
                 mFontType == GFX_FONT_TYPE_TT_OPENTYPE);
     }
     virtual bool MatchesGenericFamily(const nsACString& aGeneric) const {
         if (aGeneric.IsEmpty()) {
             return true;
         }
         // Japanese 'Mincho' fonts do not belong to FF_MODERN even if
         // they are fixed pitch because they have variable stroke width.
         if (mWindowsFamily == FF_ROMAN && mWindowsPitch & FIXED_PITCH) {
             return aGeneric.EqualsLiteral("monospace");
         }
         // Japanese 'Gothic' fonts do not belong to FF_SWISS even if
         // they are variable pitch because they have constant stroke width.
         if (mWindowsFamily == FF_MODERN && mWindowsPitch & VARIABLE_PITCH) {
             return aGeneric.EqualsLiteral("sans-serif");
         }
         // All other fonts will be grouped correctly using family...
         switch (mWindowsFamily) {
         case FF_DONTCARE:
             return false;
         case FF_ROMAN:
             return aGeneric.EqualsLiteral("serif");
         case FF_SWISS:
             return aGeneric.EqualsLiteral("sans-serif");
         case FF_MODERN:
             return aGeneric.EqualsLiteral("monospace");
         case FF_SCRIPT:
             return aGeneric.EqualsLiteral("cursive");
         case FF_DECORATIVE:
             return aGeneric.EqualsLiteral("fantasy");
         }
         return false;
     }
     virtual bool SupportsLangGroup(nsIAtom* aLangGroup) const {
         if (!aLangGroup || aLangGroup == nsGkAtoms::Unicode) {
             return true;
         }
         int16_t bit = -1;
         /* map our langgroup names in to Windows charset bits */
         if (aLangGroup == nsGkAtoms::x_western) {
             bit = ANSI_CHARSET;
         } else if (aLangGroup == nsGkAtoms::Japanese) {
             bit = SHIFTJIS_CHARSET;
         } else if (aLangGroup == nsGkAtoms::ko) {
             bit = HANGEUL_CHARSET;
         } else if (aLangGroup == nsGkAtoms::ko_xxx) {
             bit = JOHAB_CHARSET;
         } else if (aLangGroup == nsGkAtoms::zh_cn) {
             bit = GB2312_CHARSET;
         } else if (aLangGroup == nsGkAtoms::zh_tw) {
             bit = CHINESEBIG5_CHARSET;
         } else if (aLangGroup == nsGkAtoms::el_) {
             bit = GREEK_CHARSET;
         } else if (aLangGroup == nsGkAtoms::tr) {
             bit = TURKISH_CHARSET;
         } else if (aLangGroup == nsGkAtoms::he) {
             bit = HEBREW_CHARSET;
         } else if (aLangGroup == nsGkAtoms::ar) {
             bit = ARABIC_CHARSET;
         } else if (aLangGroup == nsGkAtoms::x_baltic) {
             bit = BALTIC_CHARSET;
         } else if (aLangGroup == nsGkAtoms::x_cyrillic) {
             bit = RUSSIAN_CHARSET;
         } else if (aLangGroup == nsGkAtoms::th) {
             bit = THAI_CHARSET;
         } else if (aLangGroup == nsGkAtoms::x_central_euro) {
             bit = EASTEUROPE_CHARSET;
         } else if (aLangGroup == nsGkAtoms::x_symbol) {
             bit = SYMBOL_CHARSET;
         }
         if (bit != -1) {
             return mCharset.test(bit);
         }
         return false;
     }
     virtual bool SupportsRange(uint8_t range) {
         return mUnicodeRanges.test(range);
     }
     virtual bool SkipDuringSystemFallback() {
         return !HasCmapTable(); // explicitly skip non-SFNT fonts
     }
     virtual bool TestCharacterMap(uint32_t aCh);
     virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                                         FontListSizes* aSizes) const;
     // create a font entry for a font with a given name
     static GDIFontEntry* CreateFontEntry(const nsAString& aName,
                                          gfxWindowsFontType aFontType,
                                          bool aItalic,
                                          uint16_t aWeight, int16_t aStretch,
                                          gfxUserFontData* aUserFontData,
                                          bool aFamilyHasItalicFace);
     // create a font entry for a font referenced by its fullname
     static GDIFontEntry* LoadLocalFont(const gfxProxyFontEntry &aProxyEntry,
                                        const nsAString& aFullname);
     uint8_t mWindowsFamily;
     uint8_t mWindowsPitch;
     gfxWindowsFontType mFontType;
     bool mForceGDI    : 1;
     // For src:local user-fonts, we keep track of whether the platform family
     // contains an italic face, because in this case we can't safely ask GDI
     // to create synthetic italics (oblique) via the LOGFONT.
     // (For other types of font, this is just set to false.)
     bool mFamilyHasItalicFace : 1;
     gfxSparseBitSet mCharset;
     gfxSparseBitSet mUnicodeRanges;
 protected:
     friend class gfxWindowsFont;
     GDIFontEntry(const nsAString& aFaceName, gfxWindowsFontType aFontType,
                  bool aItalic, uint16_t aWeight, int16_t aStretch,
                  gfxUserFontData *aUserFontData, bool aFamilyHasItalicFace);
     void InitLogFont(const nsAString& aName, gfxWindowsFontType aFontType);
     virtual gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle, bool aNeedsBold);
     virtual nsresult CopyFontTable(uint32_t aTableTag,
                                    FallibleTArray<uint8_t>& aBuffer) MOZ_OVERRIDE;
     LOGFONTW mLogFont;
 };
 // a single font family, referencing one or more faces
 class GDIFontFamily : public gfxFontFamily
 {
 public:
     GDIFontFamily(nsAString &aName) :
         gfxFontFamily(aName) {}
     virtual void FindStyleVariations(FontInfoData *aFontInfoData = nullptr);
 private:
     static int CALLBACK FamilyAddStylesProc(const ENUMLOGFONTEXW *lpelfe,
                                             const NEWTEXTMETRICEXW *nmetrics,
                                             DWORD fontType, LPARAM data);
 };
 class gfxGDIFontList : public gfxPlatformFontList {
 public:
     static gfxGDIFontList* PlatformFontList() {
         return static_cast<gfxGDIFontList*>(sPlatformFontList);
     }
     // initialize font lists
     virtual nsresult InitFontList();
     virtual gfxFontFamily* GetDefaultFont(const gfxFontStyle* aStyle);
     virtual gfxFontEntry* LookupLocalFont(const gfxProxyFontEntry *aProxyEntry,
                                           const nsAString& aFontName);
     virtual gfxFontEntry* MakePlatformFont(const gfxProxyFontEntry *aProxyEntry,
                                            const uint8_t *aFontData, uint32_t aLength);
     virtual bool ResolveFontName(const nsAString& aFontName,
                                    nsAString& aResolvedFontName);
     virtual void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                                         FontListSizes* aSizes) const;
     virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                                         FontListSizes* aSizes) const;
 private:
     friend class gfxWindowsPlatform;
     gfxGDIFontList();
     nsresult GetFontSubstitutes();
     static int CALLBACK EnumFontFamExProc(ENUMLOGFONTEXW *lpelfe,
                                           NEWTEXTMETRICEXW *lpntme,
                                           DWORD fontType,
                                           LPARAM lParam);
     virtual already_AddRefed<FontInfoData> CreateFontInfoData();
     typedef nsRefPtrHashtable<nsStringHashKey, gfxFontFamily> FontTable;
     FontTable mFontSubstitutes;
     nsTArray<nsString> mNonExistingFonts;
 };
 #endif /* GFX_GDIFONTLIST_H */

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gfx/thebes/gfxGDIFontList.h@97036ab72558 (annotated)

gfx/thebes/gfxGDIFontList.h