X:/dropbox/visualizationlibrary/src/vlCore/plugins/ioPNG.hpp

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#if !defined(ioPNG_INCLUDE_ONCE)
#define ioPNG_INCLUDE_ONCE

#include <vlCore/ResourceLoadWriter.hpp>
#include <vlCore/ResourceDatabase.hpp>
#include <vlCore/Image.hpp>

namespace vl
{
  class VirtualFile;
  class String;
  class Image;

  VLCORE_EXPORT ref<Image> loadPNG(VirtualFile* file);
  VLCORE_EXPORT ref<Image> loadPNG(const String& path);
  VLCORE_EXPORT bool isPNG(VirtualFile* file);
  VLCORE_EXPORT bool savePNG(const Image* src, const String& path, int compression = 6);
  VLCORE_EXPORT bool savePNG(const Image* src, VirtualFile* file, int compression = 6);

  //---------------------------------------------------------------------------
  // LoadWriterPNG
  //---------------------------------------------------------------------------
  class LoadWriterPNG: public ResourceLoadWriter
  {
    VL_INSTRUMENT_CLASS(vl::LoadWriterPNG, ResourceLoadWriter)

  public:    
    LoadWriterPNG(): ResourceLoadWriter("|png|", "|png|"), mCompression(6) 
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }

    ref<ResourceDatabase> loadResource(const String& path) const 
    {
      ref<ResourceDatabase> res_db = new ResourceDatabase;
      ref<Image> img = loadPNG(path);
      if (img)
        res_db->resources().push_back(img);
      return res_db;
    }

    ref<ResourceDatabase> loadResource(VirtualFile* file) const
    {
      ref<ResourceDatabase> res_db = new ResourceDatabase;
      ref<Image> img = loadPNG(file);
      if (img)
        res_db->resources().push_back(img);
      return res_db;
    }

    bool writeResource(const String& path, ResourceDatabase* resource) const
    {
      bool ok = true;
      for(unsigned i=0; i<resource->count<Image>(); ++i)
        ok &= savePNG(resource->get<Image>(i), path, compression());
      return ok;
    }

    bool writeResource(VirtualFile* file, ResourceDatabase* resource) const
    {
      bool ok = true;
      for(unsigned i=0; i<resource->count<Image>(); ++i)
        ok &= savePNG(resource->get<Image>(i), file, compression());
      return ok;
    }

    int compression() const { return mCompression; }
    void setCompression(int compression) { mCompression = compression; }

  protected:
    int mCompression;
  };
}

#endif