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