1 files changed, 117 insertions, 0 deletions
diff --git a/gfx/thebes/gfxDWriteFonts.h b/gfx/thebes/gfxDWriteFonts.h
new file mode 100644
index 0000000000..fc01aee6d9
--- /dev/null
+++ b/gfx/thebes/gfxDWriteFonts.h
@@ -0,0 +1,117 @@
+/* -*- 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/Atomics.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/UniquePtr.h"
+#include <dwrite_1.h>
+
+#include "gfxFont.h"
+#include "gfxUserFontSet.h"
+#include "nsTHashMap.h"
+#include "nsHashKeys.h"
+
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/gfx/UnscaledFontDWrite.h"
+
+/**
+ * \brief Class representing a font face for a font entry.
+ */
+class gfxDWriteFont final : public gfxFont {
+ public:
+  gfxDWriteFont(const RefPtr<mozilla::gfx::UnscaledFontDWrite>& aUnscaledFont,
+                gfxFontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
+                RefPtr<IDWriteFontFace> aFontFace = nullptr,
+                AntialiasOption = kAntialiasDefault);
+
+  static bool InitDWriteSupport();
+
+  // These Update functions update gfxVars with font settings, they must only be
+  // called in the parent process.
+  static void UpdateSystemTextVars();
+  static void UpdateClearTypeVars();
+
+  static void SystemTextQualityChanged();
+
+  gfxFont* CopyWithAntialiasOption(AntialiasOption anAAOption) const override;
+
+  bool AllowSubpixelAA() const override { return mAllowManualShowGlyphs; }
+
+  bool IsValid() const;
+
+  IDWriteFontFace* GetFontFace();
+
+  /* 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;
+
+  bool ProvidesGlyphWidths() const override;
+
+  int32_t GetGlyphWidth(uint16_t aGID) override;
+
+  bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) 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_DWRITE; }
+
+  already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
+      const TextRunDrawParams& aRunParams) override;
+
+  bool ShouldRoundXOffset(cairo_t* aCairo) const override;
+
+ protected:
+  ~gfxDWriteFont() override;
+
+  const Metrics& GetHorizontalMetrics() const override { return mMetrics; }
+
+  bool GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS* aFontMetrics);
+
+  void ComputeMetrics(AntialiasOption anAAOption);
+
+  bool HasBitmapStrikeForSize(uint32_t aSize);
+
+  gfxFloat MeasureGlyphWidth(uint16_t aGlyph);
+
+  DWRITE_MEASURING_MODE GetMeasuringMode() const;
+
+  static mozilla::Atomic<bool> sForceGDIClassicEnabled;
+  bool GetForceGDIClassic() const;
+
+  RefPtr<IDWriteFontFace> mFontFace;
+  RefPtr<IDWriteFontFace1> mFontFace1;  // may be unavailable on older DWrite
+
+  Metrics mMetrics;
+
+  // cache of glyph widths in 16.16 fixed-point pixels
+  mozilla::UniquePtr<nsTHashMap<nsUint32HashKey, int32_t>> mGlyphWidths;
+
+  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.
+  mozilla::Atomic<bool> mAzureScaledFontUsedClearType;
+
+  // Cache the GDI version of the ScaledFont so that font keys and other
+  // meta-data can remain stable even if there is thrashing between GDI and
+  // non-GDI usage.
+  mozilla::Atomic<mozilla::gfx::ScaledFont*> mAzureScaledFontGDI;
+
+  bool UsingClearType() {
+    return mozilla::gfx::gfxVars::SystemTextQuality() == CLEARTYPE_QUALITY;
+  }
+};
+
+#endif