1/*
2 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
3 * Copyright (C) 2015 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21#pragma once
22
23#include <wtf/HashMap.h>
24#include <wtf/Vector.h>
25
26namespace WebCore {
27
28class AffineTransform;
29class SVGInlineTextBox;
30
31// A SVGTextChunk describes a range of SVGTextFragments, see the SVG spec definition of a "text chunk".
32class SVGTextChunk {
33public:
34 enum ChunkStyle {
35 DefaultStyle = 1 << 0,
36 MiddleAnchor = 1 << 1,
37 EndAnchor = 1 << 2,
38 RightToLeftText = 1 << 3,
39 VerticalText = 1 << 4,
40 LengthAdjustSpacing = 1 << 5,
41 LengthAdjustSpacingAndGlyphs = 1 << 6
42 };
43
44 SVGTextChunk(const Vector<SVGInlineTextBox*>&, unsigned first, unsigned limit);
45
46 unsigned totalCharacters() const;
47 float totalLength() const;
48 float totalAnchorShift() const;
49 void layout(HashMap<SVGInlineTextBox*, AffineTransform>&) const;
50
51private:
52 void processTextAnchorCorrection() const;
53 void buildBoxTransformations(HashMap<SVGInlineTextBox*, AffineTransform>&) const;
54 void processTextLengthSpacingCorrection() const;
55
56 bool isVerticalText() const { return m_chunkStyle & VerticalText; }
57 float desiredTextLength() const { return m_desiredTextLength; }
58
59 bool hasDesiredTextLength() const { return m_desiredTextLength > 0 && ((m_chunkStyle & LengthAdjustSpacing) || (m_chunkStyle & LengthAdjustSpacingAndGlyphs)); }
60 bool hasTextAnchor() const { return m_chunkStyle & RightToLeftText ? !(m_chunkStyle & EndAnchor) : (m_chunkStyle & (MiddleAnchor | EndAnchor)); }
61 bool hasLengthAdjustSpacing() const { return m_chunkStyle & LengthAdjustSpacing; }
62 bool hasLengthAdjustSpacingAndGlyphs() const { return m_chunkStyle & LengthAdjustSpacingAndGlyphs; }
63
64 bool boxSpacingAndGlyphsTransform(const SVGInlineTextBox*, AffineTransform&) const;
65
66private:
67 // Contains all SVGInlineTextBoxes this chunk spans.
68 Vector<SVGInlineTextBox*> m_boxes;
69
70 unsigned m_chunkStyle { DefaultStyle };
71 float m_desiredTextLength { 0 };
72};
73
74} // namespace WebCore
75