Bug 1485712 - set SkTypeface atomically in ScaledFonts. r=rhunt

gfx/2d/ScaledFontBase.cpp

@@ -54,7 +54,7 @@ ScaledFont::GetDefaultAAMode()
 ScaledFontBase::~ScaledFontBase()
 {
 #ifdef USE_SKIA
-  SkSafeUnref(mTypeface);
+  SkSafeUnref<SkTypeface>(mTypeface);
 #endif
 #ifdef USE_CAIRO_SCALED_FONT
   cairo_scaled_font_destroy(mScaledFont);
@@ -64,16 +64,30 @@ ScaledFontBase::~ScaledFontBase()
 ScaledFontBase::ScaledFontBase(const RefPtr<UnscaledFont>& aUnscaledFont,
                                Float aSize)
   : ScaledFont(aUnscaledFont)
-  , mSize(aSize)
-{
 #ifdef USE_SKIA
-  mTypeface = nullptr;
+  , mTypeface(nullptr)
 #endif
 #ifdef USE_CAIRO_SCALED_FONT
-  mScaledFont = nullptr;
+  , mScaledFont(nullptr)
 #endif
+  , mSize(aSize)
+{
 }
 
+#ifdef USE_SKIA
+SkTypeface*
+ScaledFontBase::GetSkTypeface()
+{
+  if (!mTypeface) {
+    SkTypeface* typeface = CreateSkTypeface();
+    if (!mTypeface.compareExchange(nullptr, typeface)) {
+        SkSafeUnref(typeface);
+    }
+  }
+  return mTypeface;
+}
+#endif
+
 #ifdef USE_CAIRO_SCALED_FONT
 bool
 ScaledFontBase::PopulateCairoScaledFont()

gfx/2d/ScaledFontBase.h

@@ -42,7 +42,7 @@ public:
   virtual Float GetSize() const override { return mSize; }
 
 #ifdef USE_SKIA
-  virtual SkTypeface* GetSkTypeface() { return mTypeface; }
+  SkTypeface* GetSkTypeface();
 #endif
 
 #ifdef USE_CAIRO_SCALED_FONT
@@ -54,7 +54,8 @@ public:
 protected:
   friend class DrawTargetSkia;
 #ifdef USE_SKIA
-  SkTypeface* mTypeface;
+  Atomic<SkTypeface*> mTypeface;
+  virtual SkTypeface* CreateSkTypeface() { return nullptr; }
   SkPath GetSkiaPathForGlyphs(const GlyphBuffer &aBuffer);
 #endif
 #ifdef USE_CAIRO_SCALED_FONT

gfx/2d/ScaledFontDWrite.cpp

@@ -172,29 +172,26 @@ ScaledFontDWrite::GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget
 
 #ifdef USE_SKIA
 SkTypeface*
-ScaledFontDWrite::GetSkTypeface()
+ScaledFontDWrite::CreateSkTypeface()
 {
-  if (!mTypeface) {
-    RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
-    if (!factory) {
-      return nullptr;
-    }
-
-    Float gamma = mGamma;
-    // Skia doesn't support a gamma value outside of 0-4, so default to 2.2
-    if (gamma < 0.0f || gamma > 4.0f) {
-      gamma = 2.2f;
-    }
-
-    Float contrast = mContrast;
-    // Skia doesn't support a contrast value outside of 0-1, so default to 1.0
-    if (contrast < 0.0f || contrast > 1.0f) {
-      contrast = 1.0f;
-    }
-
-    mTypeface = SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle, mForceGDIMode, gamma, contrast);
+  RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
+  if (!factory) {
+    return nullptr;
   }
-  return mTypeface;
+
+  Float gamma = mGamma;
+  // Skia doesn't support a gamma value outside of 0-4, so default to 2.2
+  if (gamma < 0.0f || gamma > 4.0f) {
+    gamma = 2.2f;
+  }
+
+  Float contrast = mContrast;
+  // Skia doesn't support a contrast value outside of 0-1, so default to 1.0
+  if (contrast < 0.0f || contrast > 1.0f) {
+    contrast = 1.0f;
+  }
+
+  return SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle, mForceGDIMode, gamma, contrast);
 }
 #endif
 

gfx/2d/ScaledFontDWrite.h

@@ -67,7 +67,7 @@ public:
   bool ForceGDIMode() { return mForceGDIMode; }
 
 #ifdef USE_SKIA
-  SkTypeface* GetSkTypeface() override;
+  SkTypeface* CreateSkTypeface() override;
   SkFontStyle mStyle;
 #endif
 

gfx/2d/ScaledFontFontconfig.cpp

@@ -43,13 +43,9 @@ ScaledFontFontconfig::~ScaledFontFontconfig()
 }
 
 #ifdef USE_SKIA
-SkTypeface* ScaledFontFontconfig::GetSkTypeface()
+SkTypeface* ScaledFontFontconfig::CreateSkTypeface()
 {
-  if (!mTypeface) {
-    mTypeface = SkCreateTypefaceFromCairoFTFontWithFontconfig(mScaledFont, mPattern);
-  }
-
-  return mTypeface;
+  return SkCreateTypefaceFromCairoFTFontWithFontconfig(mScaledFont, mPattern);
 }
 #endif
 

gfx/2d/ScaledFontFontconfig.h

@@ -28,7 +28,7 @@ public:
   FontType GetType() const override { return FontType::FONTCONFIG; }
 
 #ifdef USE_SKIA
-  SkTypeface* GetSkTypeface() override;
+  SkTypeface* CreateSkTypeface() override;
 #endif
 
   bool CanSerialize() override { return true; }

gfx/2d/ScaledFontFreeType.cpp

@@ -35,13 +35,9 @@ ScaledFontFreeType::ScaledFontFreeType(cairo_scaled_font_t* aScaledFont,
 }
 
 #ifdef USE_SKIA
-SkTypeface* ScaledFontFreeType::GetSkTypeface()
+SkTypeface* ScaledFontFreeType::CreateSkTypeface()
 {
-  if (!mTypeface) {
-    mTypeface = SkCreateTypefaceFromCairoFTFont(mScaledFont);
-  }
-
-  return mTypeface;
+  return SkCreateTypefaceFromCairoFTFont(mScaledFont);
 }
 #endif
 

gfx/2d/ScaledFontFreeType.h

@@ -27,7 +27,7 @@ public:
   FontType GetType() const override { return FontType::FREETYPE; }
 
 #ifdef USE_SKIA
-  virtual SkTypeface* GetSkTypeface() override;
+  virtual SkTypeface* CreateSkTypeface() override;
 #endif
 
   bool CanSerialize() override { return true; }

gfx/2d/ScaledFontMac.cpp

@@ -177,21 +177,19 @@ ScaledFontMac::~ScaledFontMac()
 }
 
 #ifdef USE_SKIA
-SkTypeface* ScaledFontMac::GetSkTypeface()
+SkTypeface* ScaledFontMac::CreateSkTypeface()
 {
-  if (!mTypeface) {
-    if (mCTFont) {
-      mTypeface = SkCreateTypefaceFromCTFont(mCTFont);
-    } else {
-      auto unscaledMac = static_cast<UnscaledFontMac*>(GetUnscaledFont().get());
-      bool dataFont = unscaledMac->IsDataFont();
-      CTFontRef fontFace =
-        CreateCTFontFromCGFontWithVariations(mFont, mSize, !dataFont);
-      mTypeface = SkCreateTypefaceFromCTFont(fontFace);
-      CFRelease(fontFace);
-    }
+  if (mCTFont) {
+    return SkCreateTypefaceFromCTFont(mCTFont);
+  } else {
+    auto unscaledMac = static_cast<UnscaledFontMac*>(GetUnscaledFont().get());
+    bool dataFont = unscaledMac->IsDataFont();
+    CTFontRef fontFace =
+      CreateCTFontFromCGFontWithVariations(mFont, mSize, !dataFont);
+    SkTypeface* typeface = SkCreateTypefaceFromCTFont(fontFace);
+    CFRelease(fontFace);
+    return typeface;
   }
-  return mTypeface;
 }
 #endif
 

gfx/2d/ScaledFontMac.h

@@ -34,7 +34,7 @@ public:
 
   FontType GetType() const override { return FontType::MAC; }
 #ifdef USE_SKIA
-  SkTypeface* GetSkTypeface() override;
+  SkTypeface* CreateSkTypeface() override;
 #endif
   already_AddRefed<Path> GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget) override;
 

gfx/2d/ScaledFontWin.cpp

@@ -122,12 +122,9 @@ ScaledFontWin::GetDefaultAAMode()
 }
 
 #ifdef USE_SKIA
-SkTypeface* ScaledFontWin::GetSkTypeface()
+SkTypeface* ScaledFontWin::CreateSkTypeface()
 {
-  if (!mTypeface) {
-    mTypeface = SkCreateTypefaceFromLOGFONT(mLogFont);
-  }
-  return mTypeface;
+  return SkCreateTypefaceFromLOGFONT(mLogFont);
 }
 #endif
 

gfx/2d/ScaledFontWin.h

@@ -28,7 +28,7 @@ public:
   AntialiasMode GetDefaultAAMode() override;
 
 #ifdef USE_SKIA
-  SkTypeface* GetSkTypeface() override;
+  SkTypeface* CreateSkTypeface() override;
 #endif
 
 protected: