// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
 * Copyright (C) 2010 Canonical Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * 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/>.
 *
 * Authored by: Jay Taoko <jay.taoko@canonical.com>
 */

#ifndef BACKGROUND_EFFECT_HELPER_H
#define BACKGROUND_EFFECT_HELPER_H

#include "config.h"

#include <Nux/Nux.h>
#include <NuxGraphics/GLThread.h>

namespace unity
{

enum BlurType
{
  BLUR_NONE,
  BLUR_STATIC,
  BLUR_ACTIVE
};

}

class BackgroundEffectHelper
{
public:
  BackgroundEffectHelper();
  ~BackgroundEffectHelper();

  nux::Property<nux::View*> owner;
  nux::Property<bool> enabled;

  nux::ObjectPtr<nux::IOpenGLBaseTexture> GetBlurRegion(nux::Geometry const& geo, bool force_update = false);
  // We could add more functions here to get different types of effects based on the background texture
  // nux::ObjectPtr<nux::IOpenGLBaseTexture> GetPixelatedRegion(nux::Rect rect, int pixel_size, bool update);

  nux::ObjectPtr<nux::IOpenGLBaseTexture> GetRegion(nux::Geometry const& geometry, bool force_update = false);

  void DirtyCache();

  static void ProcessDamage(nux::Geometry const& geo);
  static bool HasDirtyHelpers();
  static bool HasEnabledHelpers();
  static bool HasDamageableHelpers();

  static nux::Property<unity::BlurType> blur_type;
  static nux::Property<float> sigma_high;
  static nux::Property<float> sigma_med;
  static nux::Property<float> sigma_low;
  static nux::Property<bool> updates_enabled;
  static nux::Property<bool> detecting_occlusions;

  static nux::Geometry monitor_rect_;
  
  nux::FxStructure blur_fx_struct_;
  nux::FxStructure noise_fx_struct_;
  
protected:
  static void Register   (BackgroundEffectHelper* self);
  static void Unregister (BackgroundEffectHelper* self);

private:
  void OnEnabledChanged (bool value);

  nux::ObjectPtr<nux::BaseTexture> noise_texture_;
  nux::ObjectPtr<nux::IOpenGLBaseTexture> blur_texture_;
  nux::ObjectPtr<nux::IOpenGLBaseTexture> resize_tmp_;
  nux::ObjectPtr<nux::IOpenGLBaseTexture> noisy_tmp_;
  nux::Geometry blur_geometry_;

  bool cache_dirty;

  static std::list<BackgroundEffectHelper*> registered_list_;
};

#endif