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