gfx/thebes/gfxDWriteFonts.h
author Kris Maglione <maglione.k@gmail.com>
Thu, 14 Feb 2019 17:54:00 -0800
changeset 517406 7436c0f5b8b1583d20d5ea2d1d9d3b2c665bdf33
parent 509297 19828a8dd8ae5ce8d7aa37d57ed607ee3043e49b
child 527951 884f5dc55873c9345ee945cd6d5427e8ab398071
permissions -rw-r--r--
Fix botched backout (bug 1524687). r=bustage

/* -*- 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_WINDOWSDWRITEFONTS_H
#define GFX_WINDOWSDWRITEFONTS_H

#include "mozilla/MemoryReporting.h"
#include "mozilla/UniquePtr.h"
#include <dwrite_1.h>

#include "gfxFont.h"
#include "gfxUserFontSet.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"

#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/UnscaledFontDWrite.h"

struct _cairo_font_face;
typedef _cairo_font_face cairo_font_face_t;

/**
 * \brief Class representing a font face for a font entry.
 */
class gfxDWriteFont : public gfxFont {
 public:
  gfxDWriteFont(const RefPtr<mozilla::gfx::UnscaledFontDWrite> &aUnscaledFont,
                gfxFontEntry *aFontEntry, const gfxFontStyle *aFontStyle,
                RefPtr<IDWriteFontFace> aFontFace = nullptr,
                AntialiasOption = kAntialiasDefault);
  ~gfxDWriteFont();

  static void UpdateSystemTextQuality();
  static void SystemTextQualityChanged();

  mozilla::UniquePtr<gfxFont> CopyWithAntialiasOption(
      AntialiasOption anAAOption) override;

  virtual uint32_t GetSpaceGlyph() override;

  virtual bool SetupCairoFont(DrawTarget *aDrawTarget) override;

  virtual bool AllowSubpixelAA() override { return mAllowManualShowGlyphs; }

  bool IsValid() const;

  IDWriteFontFace *GetFontFace();

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

  virtual bool ProvidesGlyphWidths() const override;

  virtual int32_t GetGlyphWidth(uint16_t aGID) override;

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

  virtual FontType GetType() const override { return FONT_TYPE_DWRITE; }

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

 protected:
  cairo_scaled_font_t *InitCairoScaledFont();

  virtual const Metrics &GetHorizontalMetrics() override;

  bool GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS *aFontMetrics);

  void ComputeMetrics(AntialiasOption anAAOption);

  bool HasBitmapStrikeForSize(uint32_t aSize);

  cairo_font_face_t *CairoFontFace();

  gfxFloat MeasureGlyphWidth(uint16_t aGlyph);

  DWRITE_MEASURING_MODE GetMeasuringMode();
  bool GetForceGDIClassic();

  RefPtr<IDWriteFontFace> mFontFace;
  RefPtr<IDWriteFontFace1> mFontFace1;  // may be unavailable on older DWrite

  cairo_font_face_t *mCairoFontFace;

  Metrics *mMetrics;

  // cache of glyph widths in 16.16 fixed-point pixels
  mozilla::UniquePtr<nsDataHashtable<nsUint32HashKey, int32_t>> mGlyphWidths;

  uint32_t mSpaceGlyph;

  bool mUseSubpixelPositions;
  bool mAllowManualShowGlyphs;

  // Used to record the sUseClearType setting at the time mAzureScaledFont
  // was set up, so we can tell if it's stale and needs to be re-created.
  bool mAzureScaledFontUsedClearType;

  bool UsingClearType() {
    return mozilla::gfx::gfxVars::SystemTextQuality() == CLEARTYPE_QUALITY;
  }
};

#endif