/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 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
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "CairoInfoPanelRenderer.h"

#include "../InfoPanelSceneLayer.h"

namespace OrthancStone
{
  namespace Internals
  {
    void CairoInfoPanelRenderer::Update(const ISceneLayer& layer)
    {
      const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer);

      texture_.Copy(l.GetTexture(), true);
      anchor_ = l.GetAnchor();
      isLinearInterpolation_ = l.IsLinearInterpolation();
    }

    
    void CairoInfoPanelRenderer::Render(const AffineTransform2D& transform,
                                        unsigned int canvasWidth,
                                        unsigned int canvasHeight)
    {
      int dx, dy;
      InfoPanelSceneLayer::ComputeAnchorLocation(
        dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(),
        canvasWidth, canvasHeight);

      cairo_t* cr = target_.GetCairoContext();

      cairo_save(cr);

      cairo_matrix_t t;
      cairo_matrix_init_identity(&t);
      cairo_matrix_translate(&t, dx, dy);
      cairo_transform(cr, &t);

      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
      cairo_set_source_surface(cr, texture_.GetObject(), 0, 0);

      if (isLinearInterpolation_)
      {
        cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR);
      }
      else
      {
        cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST);
      }

      cairo_paint(cr);

      cairo_restore(cr);
    }
  }
}