KeosImagesLoader.cpp

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/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */

#include "KeosImagesLoader.h"
#include "KeosImage.h"
#include "../Extlibs/DevIL/il.h"
#include "KeosPixelUtils.h"
#include "KeosLogger.h"

namespace Keos
{
  //=======================================================================
  // CImagesLoader implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  CImagesLoader::CImagesLoader()
  {
    // DevIL initialization
    ilInit();

    // We indicate that the origin of the images is on the upper-left corner
    ilOriginFunc(IL_ORIGIN_UPPER_LEFT);
    ilEnable(IL_ORIGIN_SET);

    // We authorize the destruction of already existing files, for the saving
    ilEnable(IL_FILE_OVERWRITE);

    // We force the load of the images in 32 bits BGRA
    ilSetInteger(IL_FORMAT_MODE, IL_BGRA);
    ilEnable(IL_FORMAT_SET);
  }

  //-----------------------------------------------------------------------
  CImagesLoader::~CImagesLoader()
  {
    // DevIL shutdown
    ilShutDown();
  }

  //-----------------------------------------------------------------------
  CImage* CImagesLoader::LoadFromFile(const String& strFilename)
  {
    // Generation of a new texture
    ILuint Texture;
    ilGenImages(1, &Texture);
    ilBindImage(Texture);

    // Load of the image
    if (!ilLoadImage(const_cast<ILstring>(strFilename.c_str())))
      LOADINGFAILED_EXCEPT(strFilename, "DevIL error : call to ilLoadImage failed", "CImagesLoader::LoadFromFile");

    // Image size
    TVector2I Size(ilGetInteger(IL_IMAGE_WIDTH), ilGetInteger(IL_IMAGE_HEIGHT));

    // Image pixels
    const uchar* pPixels = ilGetData();

    // Creation of the image
    CImage* Image = new CImage(Size, PXF_A8R8G8B8, pPixels);

    // Delete of the texture
    ilBindImage(0);
    ilDeleteImages(1, &Texture);

    ILogger::Log("Load of the image : %s", strFilename.c_str());

    return Image;
  }

  //-----------------------------------------------------------------------
  void CImagesLoader::SaveToFile(const CImage* pObject, const String& strFilename)
  {
    // We create a copy of the image in a compatible format with DevIL (ARGB 32 bits)
    CImage Image(pObject->GetSize(), PXF_A8R8G8B8);
    Image.CopyImage(*pObject);

    Image.Flip();

    // Generation of a new texture
    ILuint Texture;
    ilGenImages(1, &Texture);
    ilBindImage(Texture);

    // Image size
    const TVector2I& Size = Image.GetSize();

    // Completion of the texture with the converted pixels
    if (!ilTexImage(Size.x, Size.y, 1, GetBytesPerPixel(Image.GetFormat()), IL_BGRA, IL_UNSIGNED_BYTE, (void*)Image.GetData()))
      LOADINGFAILED_EXCEPT(strFilename, "DevIL error : call to ilTexImage failed", "CImagesLoader::SaveToFile");
    // Save of the texture
    if (!ilSaveImage(const_cast<ILstring>(strFilename.c_str())))
      LOADINGFAILED_EXCEPT(strFilename, "DevIL error : call to ilSaveImage failed", "CImagesLoader::SaveToFile");

    // Delete of the texture
    ilBindImage(0);
    ilDeleteImages(1, &Texture);

    ILogger::Log("Save of the image : %s", strFilename.c_str());
  }

} // namespace Keos

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