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      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 #include "config.h"
     21 
     22 #if ENABLE(SVG)
     23 #include "SVGTextChunk.h"
     24 
     25 #include "SVGInlineTextBox.h"
     26 #include "SVGTextFragment.h"
     27 
     28 namespace WebCore {
     29 
     30 SVGTextChunk::SVGTextChunk(unsigned chunkStyle, float desiredTextLength)
     31     : m_chunkStyle(chunkStyle)
     32     , m_desiredTextLength(desiredTextLength)
     33 {
     34 }
     35 
     36 void SVGTextChunk::calculateLength(float& length, unsigned& characters) const
     37 {
     38     SVGTextFragment* lastFragment = 0;
     39 
     40     unsigned boxCount = m_boxes.size();
     41     for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) {
     42         SVGInlineTextBox* textBox = m_boxes.at(boxPosition);
     43         Vector<SVGTextFragment>& fragments = textBox->textFragments();
     44 
     45         unsigned size = fragments.size();
     46         if (!size)
     47             continue;
     48 
     49         for (unsigned i = 0; i < size; ++i) {
     50             SVGTextFragment& fragment = fragments.at(i);
     51             characters += fragment.length;
     52 
     53             if (m_chunkStyle & VerticalText)
     54                 length += fragment.height;
     55             else
     56                 length += fragment.width;
     57 
     58             if (!lastFragment) {
     59                 lastFragment = &fragment;
     60                 continue;
     61             }
     62 
     63             // Resepect gap between chunks.
     64             if (m_chunkStyle & VerticalText)
     65                  length += fragment.y - (lastFragment->y + lastFragment->height);
     66             else
     67                  length += fragment.x - (lastFragment->x + lastFragment->width);
     68 
     69             lastFragment = &fragment;
     70         }
     71     }
     72 }
     73 
     74 float SVGTextChunk::calculateTextAnchorShift(float length) const
     75 {
     76     if (m_chunkStyle & MiddleAnchor)
     77         return -length / 2;
     78     if (m_chunkStyle & EndAnchor)
     79         return m_chunkStyle & RightToLeftText ? 0 : -length;
     80     return m_chunkStyle & RightToLeftText ? -length : 0;
     81 }
     82 
     83 } // namespace WebCore
     84 
     85 #endif // ENABLE(SVG)
     86