DispmanxLayer.h

#pragma once
//
// The MIT License (MIT)
//
// Copyright (c) 2020 Michael Walsh
//
// Based on pngview by Andrew Duncan
// https://github.com/AndrewFromMelbourne/raspidmx/tree/master/pngview
// Copyright (c) 2013 Andrew Duncan
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#include <bcm_host.h>

#include "utils/simple_geometry.h"

class DispmanxLayer
{
public:
  DispmanxLayer(int bytesperpixel, Rect dest_rect, Dimension src_image = Dimension(-1, -1),
    uint32_t *palette = NULL);
  ~DispmanxLayer();

  void hideElement();
  void clearImage();
  void setImageData(void *image_data, bool show = true);

  const int& getSourceWidth();
  const int& getSourceHeight();

  static void openDisplay(int display_num, int layer, Rect rect);
  static Rect getScreenDimensions();
  static Rect GetVideoPort(float video_aspect_ratio, int aspect_mode);
  static void closeDisplay();

private:
  void changeImageLayer(int new_layer);
  void showElement();

  VC_RECT_T m_bmpRect;
  int m_image_pitch;
  DISPMANX_RESOURCE_HANDLE_T m_resource;
  DISPMANX_ELEMENT_HANDLE_T m_element;
  DISPMANX_UPDATE_HANDLE_T m_update;

  bool m_element_is_hidden = true;

  static int s_layer;
  static DISPMANX_DISPLAY_HANDLE_T s_display;
  static Rect s_screen_rect;
  static bool s_is_fullscreen;
};