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 SVGTextChunkBuilder_h
21#define SVGTextChunkBuilder_h
22
23#include "core/rendering/svg/SVGTextChunk.h"
24#include "wtf/Vector.h"
25
26namespace WebCore {
27
28class SVGInlineTextBox;
29struct SVGTextFragment;
30
31// SVGTextChunkBuilder performs the third layout phase for SVG text.
32//
33// Phase one built the layout information from the SVG DOM stored in the RenderSVGInlineText objects (SVGTextLayoutAttributes).
34// Phase two performed the actual per-character layout, computing the final positions for each character, stored in the SVGInlineTextBox objects (SVGTextFragment).
35// Phase three performs all modifications that have to be applied to each individual text chunk (text-anchor & textLength).
36
37class SVGTextChunkBuilder {
38    WTF_MAKE_NONCOPYABLE(SVGTextChunkBuilder);
39public:
40    SVGTextChunkBuilder();
41
42    const Vector<SVGTextChunk>& textChunks() const { return m_textChunks; }
43    void transformationForTextBox(SVGInlineTextBox*, AffineTransform&) const;
44
45    void buildTextChunks(Vector<SVGInlineTextBox*>& lineLayoutBoxes);
46    void layoutTextChunks(Vector<SVGInlineTextBox*>& lineLayoutBoxes);
47
48private:
49    void addTextChunk(Vector<SVGInlineTextBox*>& lineLayoutBoxes, unsigned boxPosition, unsigned boxCount);
50    void processTextChunk(const SVGTextChunk&);
51
52    void processTextLengthSpacingCorrection(bool isVerticalText, float textLengthShift, Vector<SVGTextFragment>&, unsigned& atCharacter);
53    void processTextAnchorCorrection(bool isVerticalText, float textAnchorShift, Vector<SVGTextFragment>&);
54    void buildSpacingAndGlyphsTransform(bool isVerticalText, float scale, const SVGTextFragment&, AffineTransform&);
55
56private:
57    Vector<SVGTextChunk> m_textChunks;
58    HashMap<SVGInlineTextBox*, AffineTransform> m_textBoxTransformations;
59};
60
61} // namespace WebCore
62
63#endif
64