gfx/thebes/gfxGDIFont.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_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
  18 class gfxGDIFont : public gfxFont
  19 {
  20 public:
  21     gfxGDIFont(GDIFontEntry *aFontEntry,
  22                const gfxFontStyle *aFontStyle,
  23                bool aNeedsBold,
  24                AntialiasOption anAAOption = kAntialiasDefault);
  25
  26     virtual ~gfxGDIFont();
  27
  28     HFONT GetHFONT() { if (!mMetrics) Initialize(); return mFont; }
  29
  30     gfxFloat GetAdjustedSize() { if (!mMetrics) Initialize(); return mAdjustedSize; }
  31
  32     cairo_font_face_t   *CairoFontFace() { return mFontFace; }
  33     cairo_scaled_font_t *CairoScaledFont() { return mScaledFont; }
  34
  35     /* overrides for the pure virtual methods in gfxFont */
  36     virtual const gfxFont::Metrics& GetMetrics();
  37
  38     virtual uint32_t GetSpaceGlyph();
  39
  40     virtual bool SetupCairoFont(gfxContext *aContext);
  41
  42     /* override Measure to add padding for antialiasing */
  43     virtual RunMetrics Measure(gfxTextRun *aTextRun,
  44                                uint32_t aStart, uint32_t aEnd,
  45                                BoundingBoxType aBoundingBoxType,
  46                                gfxContext *aContextForTightBoundingBox,
  47                                Spacing *aSpacing);
  48
  49     /* required for MathML to suppress effects of ClearType "padding" */
  50     virtual gfxFont* CopyWithAntialiasOption(AntialiasOption anAAOption);
  51
  52     virtual bool ProvidesGlyphWidths() { return true; }
  53
  54     // get hinted glyph width in pixels as 16.16 fixed-point value
  55     virtual int32_t GetGlyphWidth(gfxContext *aCtx, uint16_t aGID);
  56
  57     virtual void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  58                                         FontCacheSizes* aSizes) const;
  59     virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  60                                         FontCacheSizes* aSizes) const;
  61
  62     virtual FontType GetType() const { return FONT_TYPE_GDI; }
  63
  64 protected:
  65     virtual void CreatePlatformShaper();
  66
  67     /* override to check for uniscribe failure and fall back to GDI */
  68     virtual bool ShapeText(gfxContext      *aContext,
  69                            const PRUnichar *aText,
  70                            uint32_t         aOffset,
  71                            uint32_t         aLength,
  72                            int32_t          aScript,
  73                            gfxShapedText   *aShapedText,
  74                            bool             aPreferPlatformShaping);
  75
  76     void Initialize(); // creates metrics and Cairo fonts
  77
  78     // Fill the given LOGFONT record according to our style, but don't adjust
  79     // the lfItalic field if we're going to use a cairo transform for fake
  80     // italics.
  81     void FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize, bool aUseGDIFakeItalic);
  82
  83     // mPlatformShaper is used for the GDI shaper, mUniscribeShaper
  84     // for the Uniscribe version if needed
  85     nsAutoPtr<gfxFontShaper>   mUniscribeShaper;
  86
  87     HFONT                 mFont;
  88     cairo_font_face_t    *mFontFace;
  89
  90     Metrics              *mMetrics;
  91     uint32_t              mSpaceGlyph;
  92
  93     bool                  mNeedsBold;
  94
  95     // cache of glyph widths in 16.16 fixed-point pixels
  96     nsAutoPtr<nsDataHashtable<nsUint32HashKey,int32_t> > mGlyphWidths;
  97 };
  98
  99 #endif /* GFX_GDIFONT_H */