gfx/thebes/gfxGDIFont.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   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_GDIFONT_H
   7 #define GFX_GDIFONT_H
   8
   9 #include "mozilla/MemoryReporting.h"
  10 #include "gfxFont.h"
  11 #include "gfxGDIFontList.h"
  12
  13 #include "nsDataHashtable.h"
  14 #include "nsHashKeys.h"
  15
  16 #include "cairo.h"
  17 #include "usp10.h"
  18
  19 class gfxGDIFont : public gfxFont {
  20  public:
  21   gfxGDIFont(GDIFontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
  22              AntialiasOption anAAOption = kAntialiasDefault);
  23
  24   virtual ~gfxGDIFont();
  25
  26   HFONT GetHFONT() { return mFont; }
  27
  28   cairo_font_face_t* CairoFontFace() { return mFontFace; }
  29
  30   /* overrides for the pure virtual methods in gfxFont */
  31   uint32_t GetSpaceGlyph() override;
  32
  33   bool SetupCairoFont(DrawTarget* aDrawTarget) override;
  34
  35   already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
  36       DrawTarget* aTarget) override;
  37
  38   /* override Measure to add padding for antialiasing */
  39   RunMetrics Measure(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd,
  40                      BoundingBoxType aBoundingBoxType,
  41                      DrawTarget* aDrawTargetForTightBoundingBox,
  42                      Spacing* aSpacing,
  43                      mozilla::gfx::ShapedTextFlags aOrientation) override;
  44
  45   /* required for MathML to suppress effects of ClearType "padding" */
  46   mozilla::UniquePtr<gfxFont> CopyWithAntialiasOption(
  47       AntialiasOption anAAOption) override;
  48
  49   // If the font has a cmap table, we handle it purely with harfbuzz;
  50   // but if not (e.g. .fon fonts), we'll use a GDI callback to get glyphs.
  51   bool ProvidesGetGlyph() const override { return !mFontEntry->HasCmapTable(); }
  52
  53   uint32_t GetGlyph(uint32_t aUnicode, uint32_t aVarSelector) override;
  54
  55   bool ProvidesGlyphWidths() const override { return true; }
  56
  57   // get hinted glyph width in pixels as 16.16 fixed-point value
  58   int32_t GetGlyphWidth(uint16_t aGID) override;
  59
  60   void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  61                               FontCacheSizes* aSizes) const;
  62   void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  63                               FontCacheSizes* aSizes) const;
  64
  65   FontType GetType() const override { return FONT_TYPE_GDI; }
  66
  67  protected:
  68   const Metrics& GetHorizontalMetrics() override;
  69
  70   /* override to ensure the cairo font is set up properly */
  71   bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
  72                  uint32_t aOffset, uint32_t aLength, Script aScript,
  73                  bool aVertical, RoundingFlags aRounding,
  74                  gfxShapedText* aShapedText) override;
  75
  76   void Initialize();  // creates metrics and Cairo fonts
  77
  78   // Fill the given LOGFONT record according to our size.
  79   // (Synthetic italic is *not* handled here, because GDI may not reliably
  80   // use the face we expect if we tweak the lfItalic field, and because we
  81   // have generic support for this in gfxFont::Draw instead.)
  82   void FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize);
  83
  84   HFONT mFont;
  85   cairo_font_face_t* mFontFace;
  86
  87   Metrics* mMetrics;
  88   uint32_t mSpaceGlyph;
  89
  90   bool mNeedsSyntheticBold;
  91
  92   // cache of glyph IDs (used for non-sfnt fonts only)
  93   mozilla::UniquePtr<nsDataHashtable<nsUint32HashKey, uint32_t> > mGlyphIDs;
  94   SCRIPT_CACHE mScriptCache;
  95
  96   // cache of glyph widths in 16.16 fixed-point pixels
  97   mozilla::UniquePtr<nsDataHashtable<nsUint32HashKey, int32_t> > mGlyphWidths;
  98 };
  99
 100 #endif /* GFX_GDIFONT_H */