1 /*
   2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4 *
   5 * This code is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 only, as
   7 * published by the Free Software Foundation.
   8 *
   9 * This code is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 * version 2 for more details (a copy is included in the LICENSE file that
  13 * accompanied this code).
  14 *
  15 * You should have received a copy of the GNU General Public License version
  16 * 2 along with this work; if not, write to the Free Software Foundation,
  17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18 *
  19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20 * or visit www.oracle.com if you need additional information or have any
  21 * questions.
  22 */
  23 
  24 #include "systemScale.h"
  25 #include <stdlib.h>
  26 
  27 int getNativeScaleFactor() {
  28 
  29     static int scale = -2.0;
  30 
  31     if (scale == -2) {
  32         scale = getScale("J2D_UISCALE");
  33     }
  34 
  35     if (scale >= 1) {
  36         return (int) scale;
  37     }
  38     return getScale("GDK_SCALE"); 
  39 }
  40 
  41 int getScale(const char *name) {
  42     char *uiScale = getenv(name);
  43     if (uiScale != NULL) {
  44         double scale = strtod(uiScale, NULL);
  45         if (scale < 1) {
  46             return -1;
  47         }
  48         return (int) scale;
  49     }
  50     return -1;
  51 }
  52