fontbase.cpp

00001 /***************************************************************************
00002  *   Copyright (C) 2005-2008 by the FIFE team                              *
00003  *   http://www.fifengine.de                                               *
00004  *   This file is part of FIFE.                                            *
00005  *                                                                         *
00006  *   FIFE is free software; you can redistribute it and/or                 *
00007  *   modify it under the terms of the GNU Lesser General Public            *
00008  *   License as published by the Free Software Foundation; either          *
00009  *   version 2.1 of the License, or (at your option) any later version.    *
00010  *                                                                         *
00011  *   This library is distributed in the hope that it will be useful,       *
00012  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00013  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
00014  *   Lesser General Public License for more details.                       *
00015  *                                                                         *
00016  *   You should have received a copy of the GNU Lesser General Public      *
00017  *   License along with this library; if not, write to the                 *
00018  *   Free Software Foundation, Inc.,                                       *
00019  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
00020  ***************************************************************************/
00021 
00022 // Standard C++ library includes
00023 #include <vector>
00024 
00025 // Platform specific includes
00026 
00027 // 3rd party library includes
00028 #include <boost/filesystem/convenience.hpp>
00029 
00030 // FIFE includes
00031 // These includes are split up in two parts, separated by one empty line
00032 // First block: files included from the FIFE root src directory
00033 // Second block: files included from the same folder
00034 #include "util/structures/rect.h"
00035 #include "util/base/exception.h"
00036 #include "util/utf8/utf8.h"
00037 #include "video/image.h"
00038 #include "video/renderbackend.h"
00039 
00040 #include "fontbase.h"
00041 
00042 namespace FIFE {
00043 
00044     FontBase::FontBase():
00045             m_pool(),
00046             mColor(),
00047             mGlyphSpacing(0),
00048             mRowSpacing(0),
00049             mFilename(""),
00050             m_antiAlias(true) {
00051     }
00052 
00053     void FontBase::setRowSpacing(int spacing) {
00054         mRowSpacing = spacing;
00055     }
00056 
00057     int FontBase::getRowSpacing() const {
00058         return mRowSpacing;
00059     }
00060 
00061     void FontBase::setGlyphSpacing(int spacing) {
00062         mGlyphSpacing = spacing;
00063     }
00064 
00065     int FontBase::getGlyphSpacing() const {
00066         return mGlyphSpacing;
00067     }
00068 
00069     void FontBase::setAntiAlias(bool antiAlias) {
00070         m_antiAlias = antiAlias;
00071     }
00072 
00073     bool FontBase::isAntiAlias() {
00074         return m_antiAlias;
00075     }
00076 
00077     SDL_Color FontBase::getColor() const {
00078         return mColor;
00079     }
00080 
00081     int FontBase::getStringIndexAt(const std::string &text, int x) const {
00082         assert( utf8::is_valid(text.begin(), text.end()) );
00083         std::string::const_iterator cur;
00084         if (text.size() == 0) return 0;
00085         if (x <= 0) return 0;
00086 
00087         cur = text.begin();
00088 
00089         utf8::next(cur, text.end());
00090 
00091         std::string buff;
00092         while(cur != text.end()) {
00093             buff = std::string(text.begin(), cur);
00094 
00095             if (getWidth(buff) > x) {
00096                 return buff.size();
00097             } else {
00098                 utf8::next(cur, text.end());
00099             }
00100         }
00101 
00102         if (x > getWidth(text)) {
00103             return text.size();
00104         } else {
00105             return buff.size();
00106         }
00107     }
00108 
00109     Image* FontBase::getAsImage(const std::string& text) {
00110         Image* image = m_pool.getRenderedText(this, text);
00111         if (!image) {
00112             SDL_Surface* textSurface = renderString(text);
00113             image = RenderBackend::instance()->createImage(textSurface);
00114             m_pool.addRenderedText( this, text, image );
00115         }
00116         return image;
00117     }
00118 
00119     Image* FontBase::getAsImageMultiline(const std::string& text) {
00120         const uint8_t newline_utf8 = '\n';
00121         uint32_t newline;
00122         utf8::utf8to32(&newline_utf8,&newline_utf8 + 1,&newline);
00123         //std::cout << "Text:" << text << std::endl;
00124         Image* image = m_pool.getRenderedText(this, text);
00125         if (!image) {
00126             std::vector<SDL_Surface*> lines;
00127             std::string::const_iterator it = text.begin();
00128             // split text as needed
00129             int render_width = 0, render_height = 0;
00130             do {
00131                 uint32_t codepoint = 0;
00132                 std::string line;
00133                 while( codepoint != newline && it != text.end() )
00134                 {
00135                     codepoint = utf8::next(it,text.end());
00136                     if( codepoint != newline )
00137                         utf8::append(codepoint, back_inserter(line));
00138                 }
00139                 //std::cout << "Line:" << line << std::endl;
00140                 SDL_Surface* text_surface = renderString(line);
00141                 if (text_surface->w > render_width) {
00142                     render_width = text_surface->w;
00143                 }
00144                 lines.push_back(text_surface);
00145             } while (it != text.end());
00146             
00147             render_height = (getRowSpacing() + getHeight()) * lines.size();
00148             SDL_Surface* final_surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
00149                 render_width,render_height,32,
00150                 RMASK, GMASK, BMASK ,AMASK);
00151             if (!final_surface) {
00152                 throw SDLException(std::string("CreateRGBSurface failed: ") + SDL_GetError());
00153             }
00154             SDL_FillRect(final_surface, 0, 0x00000000);
00155             int ypos = 0;
00156             for (std::vector<SDL_Surface*>::iterator i = lines.begin(); i != lines.end(); ++i) {
00157                 SDL_Rect dst_rect = { 0, 0, 0, 0 };
00158                 dst_rect.y = ypos;
00159 
00160                 SDL_SetAlpha(*i,0,SDL_ALPHA_OPAQUE);
00161                 SDL_BlitSurface(*i,0,final_surface,&dst_rect);
00162                 ypos += getRowSpacing() + getHeight();
00163                 SDL_FreeSurface(*i);
00164             }
00165             image = RenderBackend::instance()->createImage(final_surface);
00166             m_pool.addRenderedText(this, text, image);
00167         }
00168         return image;
00169     }
00170 
00171     std::string FontBase::splitTextToWidth (const std::string& text, int render_width) {
00172         const uint32_t whitespace = ' ';
00173         const uint8_t newline_utf8 = '\n';
00174         uint32_t newline;
00175         utf8::utf8to32(&newline_utf8,&newline_utf8 + 1,&newline);
00176         if (render_width <= 0 || text.empty()) { 
00177             return text;
00178         }
00179         std::string output;
00180         std::string line;
00181         std::string::const_iterator pos = text.begin();
00182         std::list<std::pair<size_t,std::string::const_iterator> > break_pos;
00183         bool firstLine = true;
00184 
00185         while( pos != text.end())
00186         {
00187             break_pos.clear();
00188             if( !firstLine ) {
00189                 line =  "\n";
00190             } else {
00191                 firstLine = false;
00192             }
00193             
00194             bool haveNewLine = false;
00195             while( getWidth(line) < render_width && pos != text.end() )
00196             {
00197                 uint32_t codepoint = utf8::next(pos, text.end());
00198                 if (codepoint == whitespace && !line.empty())
00199                     break_pos.push_back( std::make_pair(line.length(),pos) );
00200 
00201                 if( codepoint != newline )
00202                     utf8::append(codepoint, back_inserter(line) );
00203 
00204                 // Special case: Already newlines in string:
00205                 if( codepoint == newline ) {
00206                     output.append(line);
00207                     line = "";
00208                     haveNewLine = true;
00209                     break;
00210                 }
00211             }
00212             if( haveNewLine )
00213                 continue;
00214 
00215             if( pos == text.end() )
00216                 break;
00217 
00218             if( break_pos.empty() ) {
00219                 // No break position and line length smaller than 2
00220                 // means the renderwidth is really screwed. Just continue
00221                 // appending single character lines.
00222                 if( utf8::distance(line.begin(),line.end()) <= 1 && line != "\n") {
00223                     output.append(line);
00224                     continue;
00225                 }
00226                 
00227                 if (line == "\n") {
00228                     ++pos;
00229                 }
00230 
00231                 // We can't do hyphenation here,
00232                 // so we just retreat one character :-(
00233                 // FIXME
00234                 //line = line.erase(line.length() - 1);
00235                 //--pos;
00236             } else {
00237                 line = line.substr(0,break_pos.back().first);
00238                 pos = break_pos.back().second;
00239             }
00240             output.append(line);
00241         }
00242         if( !line.empty() ) {
00243             output.append(line);
00244         }
00245         return output;
00246     }
00247 }
Generated by  doxygen 1.6.2-20100208