1 files changed, 81 insertions, 0 deletions
diff --git a/widget/nsBaseScreen.h b/widget/nsBaseScreen.h
new file mode 100644
index 000000000..b07de8a9c
--- /dev/null
+++ b/widget/nsBaseScreen.h
@@ -0,0 +1,81 @@
+/* -*- 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/. */
+
+#ifndef nsBaseScreen_h
+#define nsBaseScreen_h
+
+#include "mozilla/Attributes.h"
+#include "nsIScreen.h"
+
+class nsBaseScreen : public nsIScreen
+{
+public:
+  nsBaseScreen();
+
+  NS_DECL_ISUPPORTS
+
+  // nsIScreen interface
+
+  // These simply forward to the device-pixel versions;
+  // implementations where desktop pixels may not correspond
+  // to per-screen device pixels must override.
+  NS_IMETHOD GetRectDisplayPix(int32_t *outLeft,  int32_t *outTop,
+                               int32_t *outWidth, int32_t *outHeight) override;
+  NS_IMETHOD GetAvailRectDisplayPix(int32_t *outLeft,  int32_t *outTop,
+                                    int32_t *outWidth, int32_t *outHeight) override;
+
+  /**
+   * Simple management of screen brightness locks. This abstract base class
+   * allows all widget implementations to share brightness locking code.
+   */
+  NS_IMETHOD LockMinimumBrightness(uint32_t aBrightness) override;
+  NS_IMETHOD UnlockMinimumBrightness(uint32_t aBrightness) override;
+
+  NS_IMETHOD GetRotation(uint32_t* aRotation) override {
+    *aRotation = nsIScreen::ROTATION_0_DEG;
+    return NS_OK;
+  }
+  NS_IMETHOD SetRotation(uint32_t aRotation) override { return NS_ERROR_NOT_AVAILABLE; }
+
+  NS_IMETHOD GetContentsScaleFactor(double* aContentsScaleFactor) override;
+
+  NS_IMETHOD GetDefaultCSSScaleFactor(double* aScaleFactor) override;
+
+protected:
+  virtual ~nsBaseScreen();
+
+  /**
+   * Manually set the current level of brightness locking. This is called after
+   * we determine, based on the current active locks, what the strongest
+   * lock is. You should normally not call this function - it will be
+   * called automatically by this class.
+   *
+   * Each widget implementation should implement this in a way that
+   * makes sense there. This is normally the only function that
+   * contains widget-specific code.
+   *
+   * The default implementation does nothing.
+   *
+   * @param aBrightness The current brightness level to set. If this is
+   *                    nsIScreen::BRIGHTNESS_LEVELS
+   *                    (an impossible value for a brightness level to be),
+   *                    then that signifies that there is no current
+   *                    minimum brightness level, and the screen can shut off.
+   */
+  virtual void ApplyMinimumBrightness(uint32_t aBrightness) { }
+
+private:
+  /**
+   * Checks what the minimum brightness value is, and calls
+   * ApplyMinimumBrightness.
+   */
+  void CheckMinimumBrightness();
+
+  uint32_t mBrightnessLocks[nsIScreen::BRIGHTNESS_LEVELS];
+};
+
+#endif // nsBaseScreen_h