1/*
2 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#ifndef SVGTextChunk_h
21#define SVGTextChunk_h
22
23#include "core/rendering/style/SVGRenderStyleDefs.h"
24#include "core/svg/SVGTextContentElement.h"
25
26namespace blink {
27
28class SVGInlineTextBox;
29
30// A SVGTextChunk describes a range of SVGTextFragments, see the SVG spec definition of a "text chunk".
31class SVGTextChunk {
32public:
33    enum ChunkStyle {
34        DefaultStyle = 1 << 0,
35        MiddleAnchor = 1 << 1,
36        EndAnchor = 1 << 2,
37        RightToLeftText = 1 << 3,
38        VerticalText = 1 << 4,
39        LengthAdjustSpacing = 1 << 5,
40        LengthAdjustSpacingAndGlyphs = 1 << 6
41    };
42
43    SVGTextChunk(unsigned chunkStyle, float desiredTextLength);
44
45    void calculateLength(float& length, unsigned& characters) const;
46    float calculateTextAnchorShift(float length) const;
47
48    bool isVerticalText() const { return m_chunkStyle & VerticalText; }
49    float desiredTextLength() const { return m_desiredTextLength; }
50
51    Vector<SVGInlineTextBox*>& boxes() { return m_boxes; }
52    const Vector<SVGInlineTextBox*>& boxes() const { return m_boxes; }
53
54    bool hasDesiredTextLength() const { return m_desiredTextLength > 0 && ((m_chunkStyle & LengthAdjustSpacing) || (m_chunkStyle & LengthAdjustSpacingAndGlyphs)); }
55    bool hasTextAnchor() const {  return m_chunkStyle & RightToLeftText ? !(m_chunkStyle & EndAnchor) : (m_chunkStyle & MiddleAnchor) || (m_chunkStyle & EndAnchor); }
56    bool hasLengthAdjustSpacing() const { return m_chunkStyle & LengthAdjustSpacing; }
57    bool hasLengthAdjustSpacingAndGlyphs() const { return m_chunkStyle & LengthAdjustSpacingAndGlyphs; }
58
59private:
60    // Contains all SVGInlineTextBoxes this chunk spans.
61    Vector<SVGInlineTextBox*> m_boxes;
62
63    unsigned m_chunkStyle;
64    float m_desiredTextLength;
65};
66
67} // namespace blink
68
69#endif
70