Relocate ShapeResult's GlyphBuffer helpers to ShapeResultBuffer

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

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ShapeResultBuffer_h
+#define ShapeResultBuffer_h
+
+#include "platform/fonts/shaping/ShapeResult.h"
+#include "wtf/Allocator.h"
+#include "wtf/RefPtr.h"
+#include "wtf/Vector.h"
+
+namespace blink {
+
+class GlyphBuffer;
+class TextRun;
+
+class ShapeResultBuffer {
+    WTF_MAKE_NONCOPYABLE(ShapeResultBuffer);
+    STACK_ALLOCATED();
+public:
+    ShapeResultBuffer()
+        : m_hasVerticalOffsets(false) { }
+
+    void appendResult(PassRefPtr<ShapeResult> result)
+    {
+        m_hasVerticalOffsets |= result->hasVerticalOffsets();
+        m_results.append(result);
+    }
+
+    bool hasVerticalOffsets() const { return m_hasVerticalOffsets; }
+
+    float fillGlyphBuffer(GlyphBuffer*, const TextRun&, unsigned from, unsigned to) const;
+    float fillGlyphBufferForTextEmphasis(GlyphBuffer*, const TextRun&,
+        const GlyphData* emphasisData, unsigned from, unsigned to) const;
+    int offsetForPosition(const TextRun&, float targetX) const;
+    FloatRect selectionRect(TextDirection, float totalWidth, const FloatPoint&, int height,
+        unsigned from, unsigned to) const;
+
+private:
+    float fillFastHorizontalGlyphBuffer(GlyphBuffer*, TextDirection) const;
+
+    template<TextDirection>
+    static float fillGlyphBufferForRun(GlyphBuffer*, const ShapeResult::RunInfo*,
+        float initialAdvance, unsigned from, unsigned to, unsigned runOffset);
+    static float fillGlyphBufferForTextEmphasisRun(GlyphBuffer*, const ShapeResult::RunInfo*,
+        const TextRun&, const GlyphData*, float initialAdvance, unsigned from, unsigned to,
+        unsigned runOffset);
+
+    // Empirically, cases where we get more than 50 ShapeResults are extremely rare.
+    Vector<RefPtr<ShapeResult>, 64>m_results;
+    bool m_hasVerticalOffsets;
+};
+
+} // namespace blink
+
+#endif // ShapeResultBuffer_h