sdm/libs/hwc/hwc_display_external.cpp

/*
* Copyright (c) 2014 - 2015, 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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*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above
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*       with the distribution.
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*       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
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* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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*/

#include <cutils/properties.h>
#include <utils/constants.h>

#include "hwc_display_external.h"
#include "hwc_debugger.h"

#define __CLASS__ "HWCDisplayExternal"

namespace sdm {

static void AdjustSourceResolution(uint32_t dst_width, uint32_t dst_height, uint32_t *src_width,
                                   uint32_t *src_height) {
  *src_height = (dst_width * (*src_height)) / (*src_width);
  *src_width = dst_width;
}

int HWCDisplayExternal::Create(CoreInterface *core_intf, hwc_procs_t const **hwc_procs,
                               uint32_t primary_width, uint32_t primary_height,
                               HWCDisplay **hwc_display) {
  uint32_t external_width = 0;
  uint32_t external_height = 0;

  HWCDisplay *hwc_display_external = new HWCDisplayExternal(core_intf, hwc_procs);
  int status = hwc_display_external->Init();
  if (status) {
    delete hwc_display_external;
    return status;
  }

  hwc_display_external->GetPanelResolution(&external_width, &external_height);

  int downscale_enabled = 0;
  HWCDebugHandler::Get()->GetProperty("sdm.debug.sde_downscale_enabled", &downscale_enabled);
  if (downscale_enabled == 1) {
    uint32_t primary_area = primary_width * primary_height;
    uint32_t external_area = external_width * external_height;

    if (primary_area > external_area) {
      if (primary_height > primary_width) {
        Swap(primary_height, primary_width);
      }
      AdjustSourceResolution(primary_width, primary_height,
                             &external_width, &external_height);
    }
  }

  status = hwc_display_external->SetFrameBufferResolution(external_width, external_height);
  if (status) {
    Destroy(hwc_display_external);
    return status;
  }

  *hwc_display = hwc_display_external;

  return status;
}

void HWCDisplayExternal::Destroy(HWCDisplay *hwc_display) {
  hwc_display->Deinit();
  delete hwc_display;
}

HWCDisplayExternal::HWCDisplayExternal(CoreInterface *core_intf, hwc_procs_t const **hwc_procs)
  : HWCDisplay(core_intf, hwc_procs, kHDMI, HWC_DISPLAY_EXTERNAL, false) {
}

int HWCDisplayExternal::Prepare(hwc_display_contents_1_t *content_list) {
  int status = 0;

  status = AllocateLayerStack(content_list);
  if (status) {
    return status;
  }

  status = PrepareLayerStack(content_list);
  if (status) {
    return status;
  }

  return 0;
}

int HWCDisplayExternal::Commit(hwc_display_contents_1_t *content_list) {
  int status = 0;

  status = HWCDisplay::CommitLayerStack(content_list);
  if (status) {
    return status;
  }

  status = HWCDisplay::PostCommitLayerStack(content_list);
  if (status) {
    return status;
  }

  return 0;
}

int HWCDisplayExternal::GetDisplayConfigs(uint32_t *configs, size_t *num_configs) {
  uint32_t config_count = 0;
  if (*num_configs <= 0) {
    return -EINVAL;
  }

  display_intf_->GetNumVariableInfoConfigs(&config_count);
  *num_configs = static_cast<size_t>(config_count);
  if (*num_configs <= 0) {
    return -EINVAL;
  }

  for (uint32_t i = 0; i < config_count; i++) {
    configs[i] = i;
  }

  return 0;
}

void HWCDisplayExternal::ApplyScanAdjustment(hwc_rect_t *display_frame) {
  if (display_intf_->IsUnderscanSupported()) {
    return;
  }

  // Read user defined width and height ratio
  int width = 0, height = 0;
  HWCDebugHandler::Get()->GetProperty("sdm.external_action_safe_width", &width);
  float width_ratio = FLOAT(width) / 100.0f;
  HWCDebugHandler::Get()->GetProperty("sdm.external_action_safe_height", &height);
  float height_ratio = FLOAT(height) / 100.0f;

  if (width_ratio == 0.0f ||  height_ratio == 0.0f) {
    return;
  }

  uint32_t panel_width = 0;
  uint32_t panel_height = 0;
  GetPanelResolution(&panel_width, &panel_height);

  if (panel_width == 0 || panel_height == 0) {
    DLOGV("Invalid panel dimensions (%d, %d)", panel_width, panel_height);
    return;
  }

  int x_offset = INT((FLOAT(panel_width) * width_ratio) / 2.0f);
  int y_offset = INT((FLOAT(panel_height) * height_ratio) / 2.0f);

  display_frame->left = display_frame->left + x_offset;
  display_frame->top = display_frame->top + y_offset;
  display_frame->right = display_frame->right - x_offset;
  display_frame->bottom = display_frame->bottom - y_offset;
}

}  // namespace sdm