gfx/thebes/gfxPangoFonts.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GFX_PANGOFONTS_H
   7 #define GFX_PANGOFONTS_H
   8
   9 #include "cairo.h"
  10 #include "gfxTypes.h"
  11 #include "gfxFont.h"
  12
  13 #include "nsAutoRef.h"
  14 #include "nsTArray.h"
  15
  16 #include <pango/pango.h>
  17
  18 class gfxFcFontSet;
  19 class gfxFcFont;
  20 class gfxProxyFontEntry;
  21 typedef struct _FcPattern FcPattern;
  22 typedef struct FT_FaceRec_* FT_Face;
  23 typedef struct FT_LibraryRec_  *FT_Library;
  24
  25 class gfxPangoFontGroup : public gfxFontGroup {
  26 public:
  27     gfxPangoFontGroup(const mozilla::FontFamilyList& aFontFamilyList,
  28                       const gfxFontStyle *aStyle,
  29                       gfxUserFontSet *aUserFontSet);
  30     virtual ~gfxPangoFontGroup();
  31
  32     virtual gfxFontGroup *Copy(const gfxFontStyle *aStyle);
  33
  34     virtual gfxFont *GetFontAt(int32_t i);
  35
  36     virtual void UpdateFontList();
  37
  38     virtual already_AddRefed<gfxFont>
  39         FindFontForChar(uint32_t aCh, uint32_t aPrevCh, int32_t aRunScript,
  40                         gfxFont *aPrevMatchedFont,
  41                         uint8_t *aMatchType);
  42
  43     static void Shutdown();
  44
  45     // Used for @font-face { src: local(); }
  46     static gfxFontEntry *NewFontEntry(const gfxProxyFontEntry &aProxyEntry,
  47                                       const nsAString &aFullname);
  48     // Used for @font-face { src: url(); }
  49     static gfxFontEntry *NewFontEntry(const gfxProxyFontEntry &aProxyEntry,
  50                                       const uint8_t *aFontData,
  51                                       uint32_t aLength);
  52
  53 private:
  54     // @param aLang [in] language to use for pref fonts and system default font
  55     //        selection, or nullptr for the language guessed from the
  56     //        gfxFontStyle.
  57     // The FontGroup holds a reference to this set.
  58     gfxFcFontSet *GetFontSet(PangoLanguage *aLang = nullptr);
  59
  60     class FontSetByLangEntry {
  61     public:
  62         FontSetByLangEntry(PangoLanguage *aLang, gfxFcFontSet *aFontSet);
  63         PangoLanguage *mLang;
  64         nsRefPtr<gfxFcFontSet> mFontSet;
  65     };
  66     // There is only one of entry in this array unless characters from scripts
  67     // of other languages are measured.
  68     nsAutoTArray<FontSetByLangEntry,1> mFontSets;
  69
  70     gfxFloat mSizeAdjustFactor;
  71     PangoLanguage *mPangoLanguage;
  72
  73     // @param aLang [in] language to use for pref fonts and system font
  74     //        resolution, or nullptr to guess a language from the gfxFontStyle.
  75     // @param aMatchPattern [out] if non-nullptr, will return the pattern used.
  76     already_AddRefed<gfxFcFontSet>
  77     MakeFontSet(PangoLanguage *aLang, gfxFloat aSizeAdjustFactor,
  78                 nsAutoRef<FcPattern> *aMatchPattern = nullptr);
  79
  80     gfxFcFontSet *GetBaseFontSet();
  81     gfxFcFont *GetBaseFont();
  82
  83     gfxFloat GetSizeAdjustFactor()
  84     {
  85         if (mFontSets.Length() == 0)
  86             GetBaseFontSet();
  87         return mSizeAdjustFactor;
  88     }
  89
  90     virtual void FindPlatformFont(const nsAString& aName,
  91                                   bool aUseFontSet,
  92                                   void *aClosure);
  93
  94     friend class gfxSystemFcFontEntry;
  95     static FT_Library GetFTLibrary();
  96 };
  97
  98 #endif /* GFX_PANGOFONTS_H */