widget/nsBaseScreen.cpp
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 283403 7d6e0141de4fab594b48d54663a4cc90fc78e248
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#define MOZ_FATAL_ASSERTIONS_FOR_THREAD_SAFETY

#include "nsBaseScreen.h"

NS_IMPL_ISUPPORTS(nsBaseScreen, nsIScreen)

nsBaseScreen::nsBaseScreen()
{
  for (uint32_t i = 0; i < nsIScreen::BRIGHTNESS_LEVELS; i++)
    mBrightnessLocks[i] = 0;
}

nsBaseScreen::~nsBaseScreen() { }

NS_IMETHODIMP
nsBaseScreen::GetRectDisplayPix(int32_t *outLeft,  int32_t *outTop,
                                int32_t *outWidth, int32_t *outHeight)
{
  return GetRect(outLeft, outTop, outWidth, outHeight);
}

NS_IMETHODIMP
nsBaseScreen::GetAvailRectDisplayPix(int32_t *outLeft,  int32_t *outTop,
                                     int32_t *outWidth, int32_t *outHeight)
{
  return GetAvailRect(outLeft, outTop, outWidth, outHeight);
}

NS_IMETHODIMP
nsBaseScreen::LockMinimumBrightness(uint32_t aBrightness)
{
  MOZ_ASSERT(aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
             "Invalid brightness level to lock");
  mBrightnessLocks[aBrightness]++;
  MOZ_ASSERT(mBrightnessLocks[aBrightness] > 0,
             "Overflow after locking brightness level");

  CheckMinimumBrightness();

  return NS_OK;
}

NS_IMETHODIMP
nsBaseScreen::UnlockMinimumBrightness(uint32_t aBrightness)
{
  MOZ_ASSERT(aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
             "Invalid brightness level to lock");
  MOZ_ASSERT(mBrightnessLocks[aBrightness] > 0,
             "Unlocking a brightness level with no corresponding lock");
  mBrightnessLocks[aBrightness]--;

  CheckMinimumBrightness();

  return NS_OK;
}

void
nsBaseScreen::CheckMinimumBrightness()
{
  uint32_t brightness = nsIScreen::BRIGHTNESS_LEVELS;
  for (int32_t i = nsIScreen::BRIGHTNESS_LEVELS - 1; i >=0; i--) {
    if (mBrightnessLocks[i] > 0) {
      brightness = i;
      break;
    }
  }

  ApplyMinimumBrightness(brightness);
}

NS_IMETHODIMP
nsBaseScreen::GetContentsScaleFactor(double* aContentsScaleFactor)
{
  *aContentsScaleFactor = 1.0;
  return NS_OK;
}

NS_IMETHODIMP
nsBaseScreen::GetDefaultCSSScaleFactor(double* aScaleFactor)
{
  *aScaleFactor = 1.0;
  return NS_OK;
}