/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 *
 * 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 3 of the
 * License, or (at your option) any later version.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. You must obey the GNU General Public License
 * in all respects for all of the code used other than "OpenSSL". If you
 * modify file(s) with this exception, you may extend this exception to
 * your version of the file(s), but you are not obligated to do so. If
 * you do not wish to do so, delete this exception statement from your
 * version. If you delete this exception statement from all source files
 * in the program, then also delete it here.
 * 
 * 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, see <http://www.gnu.org/licenses/>.
 **/


#include "CairoSurface.h"

#include "../Orthanc/Core/Logging.h"
#include "../Orthanc/Core/OrthancException.h"
#include "../Orthanc/Core/Images/ImageProcessing.h"

namespace OrthancStone
{
  void CairoSurface::Release()
  {
    if (surface_)
    {
      cairo_surface_destroy(surface_);
      surface_ = NULL;
    }
  }


  void CairoSurface::Allocate(unsigned int width,
                              unsigned int height)
  {
    Release();

    surface_ = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
    if (!surface_)
    {
      // Should never occur
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
    }

    if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
    {
      LOG(ERROR) << "Cannot create a Cairo surface";
      cairo_surface_destroy(surface_);
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
    }

    width_ = width;
    height_ = height;
    pitch_ = cairo_image_surface_get_stride(surface_);
    buffer_ = cairo_image_surface_get_data(surface_);
  }


  CairoSurface::CairoSurface(Orthanc::ImageAccessor& accessor)
  {
    if (accessor.GetFormat() != Orthanc::PixelFormat_BGRA32)
    {
      throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
    }      

    width_ = accessor.GetWidth();
    height_ = accessor.GetHeight();
    pitch_ = accessor.GetPitch();
    buffer_ = accessor.GetBuffer();

    surface_ = cairo_image_surface_create_for_data
      (reinterpret_cast<unsigned char*>(buffer_), CAIRO_FORMAT_RGB24, width_, height_, pitch_);
    if (!surface_)
    {
      // Should never occur
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
    }

    if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
    {
      LOG(ERROR) << "Bad pitch for a Cairo surface";
      cairo_surface_destroy(surface_);
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
    }
  }


  void CairoSurface::SetSize(unsigned int width,
                             unsigned int height)
  {
    if (width_ != width ||
        height_ != height)
    {
      Allocate(width, height);
    }
  }


  void CairoSurface::Copy(const CairoSurface& other)
  {
    Orthanc::ImageAccessor source = other.GetConstAccessor();
    Orthanc::ImageAccessor target = GetAccessor();
    Orthanc::ImageProcessing::Copy(target, source);
  }


  Orthanc::ImageAccessor CairoSurface::GetConstAccessor() const
  {
    Orthanc::ImageAccessor accessor;
    accessor.AssignReadOnly(Orthanc::PixelFormat_BGRA32, width_, height_, pitch_, buffer_);
    return accessor;
  }


  Orthanc::ImageAccessor CairoSurface::GetAccessor()
  {
    Orthanc::ImageAccessor accessor;
    accessor.AssignWritable(Orthanc::PixelFormat_BGRA32, width_, height_, pitch_, buffer_);
    return accessor;
  }
}