gfxMacFont.h - mozsearch

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/* -*- 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 <CoreText/CoreText.h>

#include "mozilla/gfx/UnscaledFontMac.h"

class CTFontEntry;

class gfxMacFont final : public gfxFont {

 public:

  gfxMacFont(const RefPtr<mozilla::gfx::UnscaledFontMac>& aUnscaledFont,

             CTFontEntry* aFontEntry, const gfxFontStyle* aFontStyle);

  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(

      const TextRunDrawParams& aRunParams) 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; }

  bool UseNativeColrFontSupport() const override;

 protected:

  ~gfxMacFont() override;

  const Metrics& GetHorizontalMetrics() const 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,

                 nsAtom* aLanguage, 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;

  bool mVariationFont;  // true if font has OpenType variations

};

#endif /* GFX_MACFONT_H */