1 files changed, 308 insertions, 0 deletions
diff --git a/layout/style/FontFaceImpl.h b/layout/style/FontFaceImpl.h
new file mode 100644
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+++ b/layout/style/FontFaceImpl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_dom_FontFaceImpl_h
+#define mozilla_dom_FontFaceImpl_h
+
+#include "mozilla/dom/FontFaceBinding.h"
+#include "mozilla/FontPropertyTypes.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/ServoStyleConsts.h"
+#include "gfxUserFontSet.h"
+#include "nsCSSPropertyID.h"
+#include "nsCSSValue.h"
+#include "nsTHashSet.h"
+
+class gfxFontFaceBufferSource;
+
+namespace mozilla {
+struct CSSFontFaceDescriptors;
+class PostTraversalTask;
+struct StyleLockedFontFaceRule;
+namespace dom {
+class CSSFontFaceRule;
+class FontFace;
+class FontFaceBufferSource;
+struct FontFaceDescriptors;
+class FontFaceSetImpl;
+class UTF8StringOrArrayBufferOrArrayBufferView;
+}  // namespace dom
+}  // namespace mozilla
+
+namespace mozilla::dom {
+
+class FontFaceImpl final {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FontFaceImpl)
+
+  friend class mozilla::PostTraversalTask;
+  friend class FontFaceBufferSource;
+  friend class Entry;
+
+ public:
+  class Entry final : public gfxUserFontEntry {
+    friend class FontFaceImpl;
+
+   public:
+    Entry(gfxUserFontSet* aFontSet, nsTArray<gfxFontFaceSrc>&& aFontFaceSrcList,
+          gfxUserFontAttributes&& aAttr)
+        : gfxUserFontEntry(std::move(aFontFaceSrcList), std::move(aAttr)),
+          mMutex("FontFaceImpl::Entry::mMutex"),
+          mFontSet(aFontSet) {}
+
+    void SetLoadState(UserFontLoadState aLoadState) override;
+    void GetUserFontSets(nsTArray<RefPtr<gfxUserFontSet>>& aResult) override;
+    already_AddRefed<gfxUserFontSet> GetUserFontSet() const override;
+
+    void CheckUserFontSet() {
+      MutexAutoLock lock(mMutex);
+      CheckUserFontSetLocked();
+    }
+
+#ifdef DEBUG
+    bool HasUserFontSet(gfxUserFontSet* aFontSet) const {
+      MutexAutoLock lock(mMutex);
+      return mFontSet == aFontSet;
+    }
+#endif
+
+    void AddFontFace(FontFaceImpl* aOwner);
+    void RemoveFontFace(FontFaceImpl* aOwner);
+    void FindFontFaceOwners(nsTHashSet<FontFace*>& aOwners);
+
+   protected:
+    void CheckUserFontSetLocked() MOZ_REQUIRES(mMutex);
+
+    mutable Mutex mMutex;
+
+    // Font set which owns this entry;
+    gfxUserFontSet* MOZ_NON_OWNING_REF mFontSet MOZ_GUARDED_BY(mMutex);
+
+    // The FontFace objects that use this user font entry.  We need to store
+    // an array of these, not just a single pointer, since the user font
+    // cache can return the same entry for different FontFaces that have
+    // the same descriptor values and come from the same origin.
+    AutoTArray<FontFaceImpl*, 1> mFontFaces MOZ_GUARDED_BY(mMutex);
+  };
+
+#ifdef DEBUG
+  void AssertIsOnOwningThread() const;
+#else
+  void AssertIsOnOwningThread() const {}
+#endif
+
+  FontFace* GetOwner() const {
+    AssertIsOnOwningThread();
+    return mOwner;
+  }
+
+  static already_AddRefed<FontFaceImpl> CreateForRule(
+      FontFace* aOwner, FontFaceSetImpl* aFontFaceSet,
+      StyleLockedFontFaceRule* aRule);
+
+  StyleLockedFontFaceRule* GetRule() { return mRule; }
+
+  bool HasLocalSrc() const;
+
+  bool GetAttributes(gfxUserFontAttributes& aAttr);
+  gfxUserFontEntry* CreateUserFontEntry();
+  gfxUserFontEntry* GetUserFontEntry() const { return mUserFontEntry; }
+  void SetUserFontEntry(gfxUserFontEntry* aEntry);
+
+  /**
+   * Returns whether this object is in the specified FontFaceSet.
+   */
+  bool IsInFontFaceSet(FontFaceSetImpl* aFontFaceSet) const;
+
+  void AddFontFaceSet(FontFaceSetImpl* aFontFaceSet);
+  void RemoveFontFaceSet(FontFaceSetImpl* aFontFaceSet);
+
+  FontFaceSetImpl* GetPrimaryFontFaceSet() const { return mFontFaceSet; }
+
+  /**
+   * Gets the family name of the FontFace as a raw string (such as 'Times', as
+   * opposed to GetFamily, which returns a CSS-escaped string, such as
+   * '"Times"').  Returns null if a valid family name was not available.
+   */
+  nsAtom* GetFamilyName() const;
+
+  /**
+   * Returns whether this object is CSS-connected, i.e. reflecting an
+   * @font-face rule.
+   */
+  bool HasRule() const { return mRule; }
+
+  /**
+   * Breaks the connection between this FontFace and its @font-face rule.
+   */
+  void DisconnectFromRule();
+
+  /**
+   * Returns whether there is an ArrayBuffer or ArrayBufferView of font
+   * data.
+   */
+  bool HasFontData() const;
+
+  /**
+   * Takes the gfxFontFaceBufferSource to represent the font data
+   * in this object.
+   */
+  already_AddRefed<gfxFontFaceBufferSource> TakeBufferSource();
+
+  /**
+   * Gets a pointer to and the length of the font data stored in the
+   * ArrayBuffer or ArrayBufferView.
+   */
+  bool GetData(uint8_t*& aBuffer, uint32_t& aLength);
+
+  /**
+   * Returns the value of the unicode-range descriptor as a gfxCharacterMap.
+   */
+  gfxCharacterMap* GetUnicodeRangeAsCharacterMap();
+
+  // Web IDL
+  void GetFamily(nsACString& aResult);
+  void SetFamily(const nsACString& aValue, ErrorResult& aRv);
+  void GetStyle(nsACString& aResult);
+  void SetStyle(const nsACString& aValue, ErrorResult& aRv);
+  void GetWeight(nsACString& aResult);
+  void SetWeight(const nsACString& aValue, ErrorResult& aRv);
+  void GetStretch(nsACString& aResult);
+  void SetStretch(const nsACString& aValue, ErrorResult& aRv);
+  void GetUnicodeRange(nsACString& aResult);
+  void SetUnicodeRange(const nsACString& aValue, ErrorResult& aRv);
+  void GetVariant(nsACString& aResult);
+  void SetVariant(const nsACString& aValue, ErrorResult& aRv);
+  void GetFeatureSettings(nsACString& aResult);
+  void SetFeatureSettings(const nsACString& aValue, ErrorResult& aRv);
+  void GetVariationSettings(nsACString& aResult);
+  void SetVariationSettings(const nsACString& aValue, ErrorResult& aRv);
+  void GetDisplay(nsACString& aResult);
+  void SetDisplay(const nsACString& aValue, ErrorResult& aRv);
+  void GetAscentOverride(nsACString& aResult);
+  void SetAscentOverride(const nsACString& aValue, ErrorResult& aRv);
+  void GetDescentOverride(nsACString& aResult);
+  void SetDescentOverride(const nsACString& aValue, ErrorResult& aRv);
+  void GetLineGapOverride(nsACString& aResult);
+  void SetLineGapOverride(const nsACString& aValue, ErrorResult& aRv);
+  void GetSizeAdjust(nsACString& aResult);
+  void SetSizeAdjust(const nsACString& aValue, ErrorResult& aRv);
+
+  FontFaceLoadStatus Status();
+  void Load(ErrorResult& aRv);
+
+  void Destroy();
+
+  FontFaceImpl(FontFace* aOwner, FontFaceSetImpl* aFontFaceSet);
+
+  void InitializeSourceURL(const nsACString& aURL);
+  void InitializeSourceBuffer(uint8_t* aBuffer, uint32_t aLength);
+
+  /**
+   * Sets all of the descriptor values in mDescriptors using values passed
+   * to the JS constructor.
+   * Returns true on success, false if parsing any descriptor failed.
+   */
+  bool SetDescriptors(const nsACString& aFamily,
+                      const FontFaceDescriptors& aDescriptors);
+
+ private:
+  ~FontFaceImpl();
+
+  // Helper function for Load.
+  void DoLoad();
+  void UpdateOwnerPromise();
+
+  // Helper function for the descriptor setter methods.
+  // Returns true if the descriptor was modified, false if descriptor is
+  // unchanged (which may not be an error: check aRv for actual failure).
+  bool SetDescriptor(nsCSSFontDesc aFontDesc, const nsACString& aValue,
+                     ErrorResult& aRv);
+
+  /**
+   * Called when a descriptor has been modified, so font-face sets can
+   * be told to refresh.
+   */
+  void DescriptorUpdated();
+
+  /**
+   * Sets the current loading status.
+   */
+  void SetStatus(FontFaceLoadStatus aStatus);
+
+  void GetDesc(nsCSSFontDesc aDescID, nsACString& aResult) const;
+
+  StyleLockedFontFaceRule* GetData() const {
+    AssertIsOnOwningThread();
+    return HasRule() ? mRule : mDescriptors;
+  }
+
+  /**
+   * Returns and takes ownership of the buffer storing the font data.
+   */
+  void TakeBuffer(uint8_t*& aBuffer, uint32_t& aLength);
+
+  FontFace* MOZ_NON_OWNING_REF mOwner;
+
+  // The @font-face rule this FontFace object is reflecting, if it is a
+  // rule backed FontFace.
+  RefPtr<StyleLockedFontFaceRule> mRule;
+
+  // The FontFace object's user font entry.  This is initially null, but is set
+  // during FontFaceSet::UpdateRules and when a FontFace is explicitly loaded.
+  RefPtr<Entry> mUserFontEntry;
+
+  // The current load status of the font represented by this FontFace.
+  // Note that we can't just reflect the value of the gfxUserFontEntry's
+  // status, since the spec sometimes requires us to go through the event
+  // loop before updating the status, rather than doing it immediately.
+  FontFaceLoadStatus mStatus;
+
+  // Represents where a FontFace's data is coming from.
+  enum SourceType {
+    eSourceType_FontFaceRule = 1,
+    eSourceType_URLs,
+    eSourceType_Buffer
+  };
+
+  // Where the font data for this FontFace is coming from.
+  SourceType mSourceType;
+
+  // If the FontFace was constructed with an ArrayBuffer(View), this is a
+  // copy of the data from it.
+  RefPtr<FontFaceBufferSource> mBufferSource;
+
+  // The values corresponding to the font face descriptors, if we are not
+  // a rule backed FontFace object.  For rule backed objects, we use
+  // the descriptors stored in mRule.
+  // FIXME This should hold a unique ptr to just the descriptors inside,
+  // so that we don't need to create a rule for it and don't need to
+  // assign a fake line number and column number. See bug 1450904.
+  RefPtr<StyleLockedFontFaceRule> mDescriptors;
+
+  // The value of the unicode-range descriptor as a gfxCharacterMap.  Valid
+  // only when mUnicodeRangeDirty is false.
+  RefPtr<gfxCharacterMap> mUnicodeRange;
+
+  // The primary FontFaceSet this FontFace is associated with,
+  // regardless of whether it is currently "in" the set.
+  RefPtr<FontFaceSetImpl> mFontFaceSet;
+
+  // Other FontFaceSets (apart from mFontFaceSet) that this FontFace
+  // appears in.
+  nsTArray<RefPtr<FontFaceSetImpl>> mOtherFontFaceSets;
+
+  // Whether mUnicodeRange needs to be rebuilt before being returned from
+  // GetUnicodeRangeAsCharacterMap.
+  bool mUnicodeRangeDirty;
+
+  // Whether this FontFace appears in mFontFaceSet.
+  bool mInFontFaceSet;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // !defined(mozilla_dom_FontFaceImpl_h)