gecko-dev/gfx/thebes/gfxMacFont.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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_MACFONT_H
#define GFX_MACFONT_H

#include "mozilla/MemoryReporting.h"
#include "gfxFont.h"
#include <ApplicationServices/ApplicationServices.h>

#include "mozilla/gfx/UnscaledFontMac.h"

class MacOSFontEntry;

class gfxMacFont : public gfxFont {
 public:
  gfxMacFont(const RefPtr<mozilla::gfx::UnscaledFontMac>& aUnscaledFont, MacOSFontEntry* aFontEntry,
             const gfxFontStyle* aFontStyle);

  virtual ~gfxMacFont();

  CGFontRef GetCGFontRef() const { return mCGFont; }

  /* override Measure to add padding for antialiasing */
  RunMetrics Measure(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd,
                     BoundingBoxType aBoundingBoxType, DrawTarget* aDrawTargetForTightBoundingBox,
                     Spacing* aSpacing, mozilla::gfx::ShapedTextFlags aOrientation) override;

  // We need to provide hinted (non-linear) glyph widths if using a font
  // with embedded color bitmaps (Apple Color Emoji), as Core Text renders
  // the glyphs with non-linear scaling at small pixel sizes.
  bool ProvidesGlyphWidths() const override {
    return mVariationFont || mFontEntry->HasFontTable(TRUETYPE_TAG('s', 'b', 'i', 'x'));
  }

  int32_t GetGlyphWidth(uint16_t aGID) override;

  bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) override;

  already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
      mozilla::gfx::DrawTarget* aTarget) override;

  bool ShouldRoundXOffset(cairo_t* aCairo) const override;

  void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                              FontCacheSizes* aSizes) const override;
  void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                              FontCacheSizes* aSizes) const override;

  FontType GetType() const override { return FONT_TYPE_MAC; }

  // Helper to create a CTFont from a CGFont, with optional font descriptor
  // (for features), and copying any variations that were set on the CGFont.
  // This is public so that gfxCoreTextShaper can also use it.
  static CTFontRef CreateCTFontFromCGFontWithVariations(CGFontRef aCGFont, CGFloat aSize,
                                                        bool aInstalledFont,
                                                        CTFontDescriptorRef aFontDesc = nullptr);

 protected:
  const Metrics& GetHorizontalMetrics() override { return mMetrics; }

  // override to prefer CoreText shaping with fonts that depend on AAT
  bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText, uint32_t aOffset, uint32_t aLength,
                 Script aScript, bool aVertical, RoundingFlags aRounding,
                 gfxShapedText* aShapedText) override;

  void InitMetrics();
  void InitMetricsFromPlatform();

  // Get width and glyph ID for a character; uses aConvFactor
  // to convert font units as returned by CG to actual dimensions
  gfxFloat GetCharWidth(CFDataRef aCmap, char16_t aUniChar, uint32_t* aGlyphID,
                        gfxFloat aConvFactor);

  // a strong reference to the CoreGraphics font
  CGFontRef mCGFont;

  // a Core Text font reference, created only if we're using CT to measure
  // glyph widths; otherwise null.
  CTFontRef mCTFont;

  mozilla::UniquePtr<gfxFontShaper> mCoreTextShaper;

  Metrics mMetrics;
  nscolor mFontSmoothingBackgroundColor;

  bool mVariationFont;  // true if font has OpenType variations
};

#endif /* GFX_MACFONT_H */