klips/esp/cpp/07_lcd-panel/main/panel_device.h

#ifndef PANEL_DEVICE_H
#define PANEL_DEVICE_H

#include <esp_lcd_panel_dev.h>
#include <esp_lcd_panel_ops.h>
#include <esp_lcd_panel_ssd1306.h>
#include "display/lv_display.h"

#define LVGL_PALETTE_SIZE      8

template<typename T>
class PanelDeviceInterface {
public:
  PanelDeviceInterface(size_t width, size_t height) : width_(width), height_(height) { }

  ~PanelDeviceInterface() = default;

  [[nodiscard]] size_t get_width() const { return width_; }

  [[nodiscard]] size_t get_height() const { return height_; }

  [[nodiscard]] size_t get_area() const { return width_ * height_; }

  [[nodiscard]] size_t get_draw_buffer_size() const
  {
    // LVGL reserves 2x4 bytes in the buffer to be used as a palette.
    return width_ * height_ / 8 + LVGL_PALETTE_SIZE;
  }

  [[nodiscard]] lv_display_t *create_display() const
  {
    return lv_display_create(width_, height_);
  }

  [[nodiscard]] T &get_vendor_config() const { return vendor_config_; }

  void create_panel(esp_lcd_panel_dev_config_t &panel_config,
                    esp_lcd_panel_io_handle_t io_handle,
                    esp_lcd_panel_handle_t &panel_handle);

private:
  size_t width_;
  size_t height_;

protected:
  T vendor_config_;
};

template<typename T>
void PanelDeviceInterface<T>::create_panel(esp_lcd_panel_dev_config_t &config,
                                           esp_lcd_panel_io_handle_t io,
                                           esp_lcd_panel_handle_t &panel)
{
  // If the passed handle is already allocated, delete it.
  if (panel != nullptr) {
    esp_lcd_panel_del(panel);
  }

  // Set the vendor config and allocate a new panel handle.
  config.vendor_config = &vendor_config_;
  // TODO: This needs moved to SSD1306
  ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io, &config, &panel));
}

#endif // PANEL_DEVICE_H