sdm/libs/core/display_virtual.cpp

/*
* Copyright (c) 2014 - 2016, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
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*      conditions and the following disclaimer.
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*      conditions and the following disclaimer in the documentation and/or other materials provided
*      with the distribution.
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*      endorse or promote products derived from this software without specific prior written
*      permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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#include <utils/constants.h>
#include <utils/debug.h>

#include "display_virtual.h"
#include "hw_interface.h"
#include "hw_info_interface.h"

#define __CLASS__ "DisplayVirtual"

namespace sdm {

DisplayVirtual::DisplayVirtual(DisplayEventHandler *event_handler, HWInfoInterface *hw_info_intf,
                               BufferSyncHandler *buffer_sync_handler, CompManager *comp_manager)
  : DisplayBase(kVirtual, event_handler, kDeviceVirtual, buffer_sync_handler, comp_manager,
                hw_info_intf) {
}

DisplayError DisplayVirtual::Init() {
  lock_guard<recursive_mutex> obj(recursive_mutex_);

  DisplayError error = HWInterface::Create(kVirtual, hw_info_intf_, buffer_sync_handler_,
                                           &hw_intf_);
  if (error != kErrorNone) {
    return error;
  }

  hw_intf_->GetDisplayAttributes(0 /* active_index */, &display_attributes_);

  error = DisplayBase::Init();
  if (error != kErrorNone) {
    HWInterface::Destroy(hw_intf_);
  }

  return error;
}

DisplayError DisplayVirtual::GetNumVariableInfoConfigs(uint32_t *count) {
  lock_guard<recursive_mutex> obj(recursive_mutex_);
  *count = 1;
  return kErrorNone;
}

DisplayError DisplayVirtual::GetConfig(uint32_t index, DisplayConfigVariableInfo *variable_info) {
  lock_guard<recursive_mutex> obj(recursive_mutex_);
  *variable_info = display_attributes_;
  return kErrorNone;
}

DisplayError DisplayVirtual::GetActiveConfig(uint32_t *index) {
  lock_guard<recursive_mutex> obj(recursive_mutex_);
  *index = 0;
  return kErrorNone;
}

DisplayError DisplayVirtual::SetActiveConfig(DisplayConfigVariableInfo *variable_info) {
  lock_guard<recursive_mutex> obj(recursive_mutex_);

  if (!variable_info) {
    return kErrorParameters;
  }

  DisplayError error = kErrorNone;
  HWDisplayAttributes display_attributes;
  HWMixerAttributes mixer_attributes;
  DisplayConfigVariableInfo fb_config = *variable_info;

  display_attributes.x_pixels = variable_info->x_pixels;
  display_attributes.y_pixels = variable_info->y_pixels;
  display_attributes.fps = variable_info->fps;

  if (display_attributes == display_attributes_) {
    return kErrorNone;
  }

  error = hw_intf_->SetDisplayAttributes(display_attributes);
  if (error != kErrorNone) {
    return error;
  }

  error = hw_intf_->GetMixerAttributes(&mixer_attributes);
  if (error != kErrorNone) {
    return error;
  }

  // Override x_pixels and y_pixels of frame buffer with mixer width and height
  fb_config.x_pixels = mixer_attributes.width;
  fb_config.y_pixels = mixer_attributes.height;

  // if display is already connected, unregister display from composition manager and register
  // the display with new configuration.
  if (display_comp_ctx_) {
    comp_manager_->UnregisterDisplay(display_comp_ctx_);
  }

  error = comp_manager_->RegisterDisplay(display_type_, display_attributes, hw_panel_info_,
                                         mixer_attributes, fb_config, &display_comp_ctx_);
  if (error != kErrorNone) {
    return error;
  }

  display_attributes_ = display_attributes;
  mixer_attributes_ = mixer_attributes;
  fb_config_ = fb_config;

  return kErrorNone;
}

DisplayError DisplayVirtual::Prepare(LayerStack *layer_stack) {
  lock_guard<recursive_mutex> obj(recursive_mutex_);

  // Clean hw layers for reuse.
  hw_layers_ = HWLayers();

  return DisplayBase::Prepare(layer_stack);
}


}  // namespace sdm