Optimize Complex Text Shaping and Caching

Source/platform/fonts/shaping/CachingWordShaper.h

 /*
- * Copyright (C) 2011 Google, Inc. All Rights Reserved.
+ * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef DOMWindowProperty_h
-#define DOMWindowProperty_h
+#ifndef CachingWordShaper_h
+#define CachingWordShaper_h
 
-#include "core/CoreExport.h"
-#include "platform/heap/Handle.h"
+
+#include "platform/geometry/FloatRect.h"
+#include "platform/text/TextRun.h"
+#include "wtf/PassRefPtr.h"
 
 namespace blink {
 
-class LocalDOMWindow;
-class LocalFrame;
+class Font;
+class GlyphBuffer;
+class SimpleFontData;
+class ShapeCache;
+struct GlyphData;
 
-class CORE_EXPORT DOMWindowProperty : public WillBeGarbageCollectedMixin {
+class PLATFORM_EXPORT CachingWordShaper final {
 public:
-    explicit DOMWindowProperty(LocalFrame*);
+    CachingWordShaper();
+    ~CachingWordShaper();
+    void clear();
 
-    virtual void willDestroyGlobalObjectInFrame();
-    virtual void willDetachGlobalObjectFromFrame();
+    float width(const Font*, const TextRun&,
+        HashSet<const SimpleFontData*>* fallbackFonts,
+        FloatRect* glyphBounds);
+    float fillGlyphBuffer(const Font*, const TextRun&,
+        HashSet<const SimpleFontData*>*, GlyphBuffer*,
+        unsigned from, unsigned to);
+    float fillGlyphBufferForTextEmphasis(const Font*, const TextRun&,
+        const GlyphData* emphasisData, GlyphBuffer*,
+        unsigned from, unsigned to);
+    FloatRect selectionRect(const Font*, const TextRun&, const FloatPoint&,
+        int height, unsigned from, unsigned to);
 
-    LocalFrame* frame() const { return m_frame; }
-
-    EAGERLY_FINALIZE_WILL_BE_REMOVED();
-    DECLARE_VIRTUAL_TRACE();
-
-protected:
-    // TODO(Oilpan): when ~DOMWindowProperty is removed, check classes that derive
-    // from it. Several will then be able to derive from GarbageCollected<> instead.
-#if !ENABLE(OILPAN)
-    virtual ~DOMWindowProperty();
-#endif
-
-    RawPtrWillBeMember<LocalFrame> m_frame;
-
-#if !ENABLE(OILPAN)
 private:
-    LocalDOMWindow* m_associatedDOMWindow;
-#endif
+    ShapeCache* m_shapeCache;
 };
 
 } // namespace blink
 
-#endif // DOMWindowProperty_h
+#endif // CachingWordShaper_h