src/tool/resource_manager.cpp

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/******************************************************************************
 *  Wormux is a convivial mass murder game.
 *  Copyright (C) 2001-2004 Lawrence Azzoug.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 ******************************************************************************
 * Resource Manager: Load resources (images/sprites) suitable for SDL
 *                    Load directly or from refernece in xml resource profile
 ******************************************************************************
 * 2005/09/21: Jean-Christophe Duberga (jcduberga@gmx.de) 
 *             Initial version
 * 
 * TODO:       Keep reference to resources, better exceptions
 *****************************************************************************/

#include "resource_manager.h"
#include <string>
#include <iostream>
#include "error.h"
#include "xml_document.h"
#include "string_tools.h"
#include "../game/config.h"
#include "../graphic/sprite.h"

Profile::Profile()
{
   doc = NULL;
}

Profile::~Profile()
{
  if (doc != NULL) delete doc;
}

ResourceManager::ResourceManager()
{
}

ResourceManager::~ResourceManager()
{
}

void ResourceManager::AddDataPath( std::string base_path)
{
  this->base_path = base_path;
}

Color ResourceManager::LoadColor(const Profile *profile, const std::string resource_name)
{
  xmlpp::Element *elem = GetElement(profile, "color", resource_name);
  if ( elem == NULL)
    Error("ResourceManager: can't find color resource \""+resource_name+"\" in profile "+profile->filename);

  uint chanel_color[4];
  char * tmp[4] = { "r", "g", "b", "a" };
  for(int i = 0; i < 4; i++) {
    if (!profile->doc->ReadUintAttr( elem, tmp[i], chanel_color[i]))
      Error("ResourceManager: color resource \""+resource_name+"\" has no "+tmp[i]+" field in profile "+profile->filename);
  }
  return Color(chanel_color[0], chanel_color[1], chanel_color[2], chanel_color[3]);
}

Surface ResourceManager::LoadImage( const std::string filename, 
        bool alpha, bool set_colorkey, Uint32 colorkey)
{
  Surface pre_surface = Surface( filename.c_str() );
  Surface end_surface;

  if(set_colorkey)
    end_surface.SetColorKey( SDL_SRCCOLORKEY, colorkey);

  if( !alpha )
    end_surface = pre_surface.DisplayFormat();
  else
    end_surface = pre_surface.DisplayFormatAlpha();

  return end_surface;
}

Profile *ResourceManager::LoadXMLProfile( const std::string xml_filename, bool relative_path)
{
   XmlReader *doc = new XmlReader;
   std::string filename, path;
   if (!relative_path) {
       path = base_path;
       filename = path + xml_filename;
   } else {
       assert ( xml_filename.rfind(PATH_SEPARATOR) != xml_filename.npos );
       path = xml_filename.substr(0, xml_filename.rfind(PATH_SEPARATOR)+1);
       filename = xml_filename;
   }

   // Load the XML
   if(!doc->Load(filename))
   {
     // TODO raise an "can't load file" exception
     Error("ResourceManager: can't load profile "+filename);
     return NULL;
   }

   Profile *profile = new Profile; 
   profile->doc = doc;
   profile->filename = xml_filename;
   profile->relative_path = path;
   return profile;
}

void ResourceManager::UnLoadXMLProfile( Profile *profile)
{
   delete profile;
}

xmlpp::Element * ResourceManager::GetElement( const Profile *profile, const std::string resource_type, const std::string resource_name)
{
  xmlpp::Element *elem = profile->doc->Access(profile->doc->GetRoot(), resource_type, resource_name);

 if(elem == NULL)
 {
   std::string r_name = resource_name;
   xmlpp::Element *cur_elem = profile->doc->GetRoot();

   while ((r_name.find("/") != r_name.npos) && (cur_elem != NULL))
   {
     cur_elem = profile->doc->Access(cur_elem, "section", r_name.substr(0, r_name.find("/")));
     r_name = r_name.substr( r_name.find("/") + 1, r_name.length());
   }
   if(cur_elem)
     elem = profile->doc->Access(cur_elem, resource_type, r_name);
  }
  return elem;
}

Surface ResourceManager::LoadImage( const Profile *profile, const std::string resource_name)
{
  xmlpp::Element *elem = GetElement ( profile, "surface", resource_name);
  if(elem == NULL)
    Error("ResourceManager: can't find image resource \""+resource_name+"\" in profile "+profile->filename);

  std::string filename; 
  if (!profile->doc->ReadStringAttr(elem, "file", filename))
    Error("ResourceManager: image resource \""+resource_name+"\" has no file field in profile "+profile->filename);

  // TODO load more properties in xml : alpha, colorkey....
  //      By now force alpha and no colorkey

  bool alpha = true;

  return LoadImage(profile->relative_path+filename, alpha);
}

Sprite *ResourceManager::LoadSprite( const Profile *profile, const std::string resource_name)
{
  xmlpp::Element *elem_sprite = GetElement(profile, "sprite", resource_name);
  if(elem_sprite == NULL)
    Error("ResourceManager: can't find sprite resource \""+resource_name+"\" in profile "+profile->filename);;

  xmlpp::Element *elem_image = profile->doc->GetMarker(elem_sprite, "image");

  if(elem_image == NULL)
    Error("ResourceManager: can't load (sprite) resource " + resource_name);

  std::string image_filename; 
  if (!profile->doc->ReadStringAttr(elem_image, "file", image_filename) )
    Error("ResourceManager: can't load (sprite) resource " + resource_name);

  // TODO load more properties in xml : alpha, colorkey....
  //      By now force alpha and no colorkey

  bool alpha = true;
  Sprite *sprite = NULL;

  xmlpp::Element *elem_grid = profile->doc->GetMarker(elem_image, "grid");

  if ( elem_grid == NULL )
  {
    // No grid element, Load the Sprite like a normal image
    Surface surface = LoadImage(profile->relative_path+image_filename, alpha);
    sprite = new Sprite();
    sprite->Init(surface, surface.GetSize(), 1, 1);
  }
  else
  {
    Point2i frameSize;
    int nb_frames_x = 0;
    int nb_frames_y = 0;
    std::string size;

    if ( ! profile->doc->ReadStringAttr(elem_grid, "size", size) )
      Error("ResourceManager: can't load sprite resource \""+resource_name+"\" has no attribute size");

    if ( size.find(",") != size.npos)
    {
      frameSize.x = atoi((size.substr(0, size.find(","))).c_str());
      frameSize.y = atoi((size.substr(size.find(",") + 1, size.length())).c_str());
    }
    else
      Error("ResourceManager: can't load sprite resource \""+resource_name+"\" has malformed size attribute");

    std::string array;
    if ( ! profile->doc->ReadStringAttr( elem_grid, "array", array) )
      Error("ResourceManager: can't load sprite resource \""+resource_name+"\" has no attribute array");

    if ( array.find(",") != array.npos)
    {
      nb_frames_x = atoi((array.substr(0, array.find(","))).c_str());
      if(nb_frames_x <= 0)
        nb_frames_x = 1;
      nb_frames_y = atoi((array.substr(array.find(",") + 1, array.length() - array.find(",") - 1)).c_str());
      if(nb_frames_y <= 0)
        nb_frames_y = 1;
    }
    else
      Error("ResourceManager: can't load (sprite) resource "+resource_name);

    Surface surface = LoadImage(profile->relative_path+image_filename, alpha);
    sprite = new Sprite();
    sprite->Init(surface, frameSize, nb_frames_x, nb_frames_y);
  }

  assert(sprite != NULL);

  xmlpp::Element *elem = profile->doc->GetMarker(elem_sprite, "animation");
  if ( elem != NULL )
  {
    std::string str;
    // Set the frame speed
    if ( profile->doc->ReadStringAttr(elem, "speed", str) )
      sprite->SetFrameSpeed(atoi(str.c_str()));

    if ( profile->doc->ReadStringAttr(elem, "loop_mode", str) )
    {
      bool loop_value;
      if(str2bool(str, loop_value))
        sprite->animation.SetLoopMode(loop_value);
      else
      if(str == "pingpong")
        sprite->animation.SetPingPongMode(true);
      else
        std::cerr << "Unrecognized xml option loop_mode=\"" << str << "\" in resource " << resource_name;
    }
  }
  return sprite;
}


ResourceManager resource_manager;

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