A remotable font management interface and DirectWrite implementation.

include/ports/SkFontMgr_indirect.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkFontMgr_indirect_DEFINED
+#define SkFontMgr_indirect_DEFINED
+
+#include "SkDataTable.h"
+#include "SkFontMgr.h"
+#include "SkFontStyle.h"
+#include "SkOnce.h"
+#include "SkRemotableFontMgr.h"
+#include "SkTArray.h"
+#include "SkTypeface.h"
+
+class SkData;
+class SkStream;
+class SkString;
+class SkTypeface;
+
+class SK_API SkFontMgr_Indirect : public SkFontMgr {
+public:
+    // TODO: The SkFontMgr is only used for createFromStream/File/Data.
+    // In the future these calls should be broken out into their own interface
+    // with a name like SkFontRenderer.
+    SkFontMgr_Indirect(SkFontMgr* impl, SkRemotableFontMgr* proxy)
+        : fImpl(SkRef(impl)), fProxy(SkRef(proxy))
+    {
+        fOnce = SK_ONCE_INIT;
+    }
+
+protected:
+    virtual int onCountFamilies() const SK_OVERRIDE;
+    virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE;
+    virtual SkFontStyleSet* onCreateStyleSet(int index) const SK_OVERRIDE;
+
+    virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const SK_OVERRIDE;
+
+    virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
+                                           const SkFontStyle& fontStyle) const SK_OVERRIDE;
+
+    virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
+                                                    const SkFontStyle&,
+                                                    const char bpc47[],
+                                                    uint32_t character) const SK_OVERRIDE;
+
+    virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
+                                         const SkFontStyle& fontStyle) const SK_OVERRIDE;
+
+    virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) const SK_OVERRIDE;
+    virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const SK_OVERRIDE;
+    virtual SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const SK_OVERRIDE;
+
+    virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
+                                               unsigned styleBits) const SK_OVERRIDE;
+
+private:
+    SkTypeface* createTypefaceFromFontId(const SkFontIdentity& fontId) const;
+
+    SkAutoTUnref<SkFontMgr> fImpl;
+    SkAutoTUnref<SkRemotableFontMgr> fProxy;
+
+    struct DataEntry {
+        int fDataId;  // key1
+        int fTtcIndex;  // key2
+        SkTypeface* fTypeface;  // value: weak ref to typeface
+
+        DataEntry() { }
+
+        // This is a move!!!
+        DataEntry(DataEntry& that)
+            : fDataId(that.fDataId)
+            , fTtcIndex(that.fTtcIndex)
+            , fTypeface(that.fTypeface)
+        {
+            SkDEBUGCODE(that.fDataId = -1;)
+            SkDEBUGCODE(that.fTtcIndex = -1;)
+            that.fTypeface = NULL;
+        }
+
+        ~DataEntry() {
+            if (fTypeface) {
+                fTypeface->weak_unref();
+            }
+        }
+    };
+    /**
+     *  This cache is essentially { dataId: { ttcIndex: typeface } }
+     *  For data caching we want a mapping from data id to weak references to
+     *  typefaces with that data id. By storing the index next to the typeface,
+     *  this data cache also acts as a typeface cache.
+     */
+    mutable SkTArray<DataEntry> fDataCache;
+    mutable SkMutex fDataCacheMutex;
+
+    mutable SkAutoTUnref<SkDataTable> fFamilyNames;
+    mutable SkOnceFlag fOnce;
+    static void set_up_family_names(const SkFontMgr_Indirect* self);
+
+    friend class SkStyleSet_Indirect;
+};
+
+#endif
+