Add support for shaper-driven line breaking to HarfBuzzShaper

third_party/WebKit/Source/platform/fonts/shaping/ShapeResult.h

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * 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 ShapeResult_h
 #define ShapeResult_h
 
+#include <memory>
+#include "platform/LayoutUnit.h"
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/text/TextDirection.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
-#include <memory>
 
 struct hb_buffer_t;
 
 namespace blink {
 
 class Font;
 class ShapeResultSpacing;
 class SimpleFontData;
 class TextRun;
 
 class PLATFORM_EXPORT ShapeResult : public RefCounted<ShapeResult> {
  public:
   static PassRefPtr<ShapeResult> create(const Font* font,
                                         unsigned numCharacters,
                                         TextDirection direction) {
     return adoptRef(new ShapeResult(font, numCharacters, direction));
   }
   static PassRefPtr<ShapeResult> createForTabulationCharacters(
       const Font*,
       const TextRun&,
       float positionOffset,
       unsigned count);
   ~ShapeResult();
 
   float width() const { return m_width; }
+  LayoutUnit snappedWidth() const { return LayoutUnit::fromFloatCeil(m_width); }
   const FloatRect& bounds() const { return m_glyphBoundingBox; }
   unsigned numCharacters() const { return m_numCharacters; }
   void fallbackFonts(HashSet<const SimpleFontData*>*) const;
-  bool rtl() const {
-    return static_cast<TextDirection>(m_direction) == TextDirection::kRtl;
+  TextDirection direction() const {
+    return static_cast<TextDirection>(m_direction);
   }
+  bool rtl() const { return direction() == TextDirection::kRtl; }
   bool hasVerticalOffsets() const { return m_hasVerticalOffsets; }
 
   // For memory reporting.
   size_t byteSize() const;
 
   unsigned offsetForPosition(float targetX, bool includePartialGlyphs) const;
   float positionForOffset(unsigned offset) const;
+  LayoutUnit snappedStartPositionForOffset(unsigned offset) const {
+    return LayoutUnit::fromFloatFloor(positionForOffset(offset));
+  }
+  LayoutUnit snappedEndPositionForOffset(unsigned offset) const {
+    return LayoutUnit::fromFloatCeil(positionForOffset(offset));
+  }
 
   PassRefPtr<ShapeResult> applySpacingToCopy(ShapeResultSpacing&,
                                              const TextRun&) const;
 
+  void copyRange(unsigned start, unsigned end, ShapeResult*) const;
+
  protected:
   struct RunInfo;
 
   ShapeResult(const Font*, unsigned numCharacters, TextDirection);
   ShapeResult(const ShapeResult&);
 
   static PassRefPtr<ShapeResult> create(const ShapeResult& other) {
     return adoptRef(new ShapeResult(other));
   }
 
@@ skipping 19 matching lines @@
   // Tracks whether any runs contain glyphs with a y-offset != 0.
   unsigned m_hasVerticalOffsets : 1;
 
   friend class HarfBuzzShaper;
   friend class ShapeResultBuffer;
 };
 
 }  // namespace blink
 
 #endif  // ShapeResult_h