1 /*
   2  * Copyright (c) 2011, 2015, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #import "AWT_debug.h"
  27 
  28 #import "jni_util.h"
  29 #import "ThreadUtilities.h"
  30 
  31 #import <JavaNativeFoundation/JavaNativeFoundation.h>
  32 
  33 #define MAX_DISPLAYS 64
  34 
  35 /*
  36  * Class:     sun_awt_CGraphicsEnvironment
  37  * Method:    getDisplayIDs
  38  * Signature: ()[I
  39  */
  40 JNIEXPORT jintArray JNICALL
  41 Java_sun_awt_CGraphicsEnvironment_getDisplayIDs
  42 (JNIEnv *env, jclass class)
  43 {
  44     jintArray ret = NULL;
  45 
  46 JNF_COCOA_ENTER(env);
  47 
  48     /* Get the count */
  49     CGDisplayCount displayCount;
  50     if (CGGetOnlineDisplayList(MAX_DISPLAYS, NULL, &displayCount) != kCGErrorSuccess) {
  51         [JNFException raise:env
  52                          as:kInternalError
  53                      reason:"CGGetOnlineDisplayList() failed to get display count"];
  54         return NULL;
  55     }
  56 
  57     /* Allocate an array and get the size list of display Ids */
  58     CGDirectDisplayID displays[MAX_DISPLAYS];
  59     if (CGGetOnlineDisplayList(displayCount, displays, &displayCount) != kCGErrorSuccess) {
  60         [JNFException raise:env
  61                          as:kInternalError
  62                      reason:"CGGetOnlineDisplayList() failed to get display list"];
  63         return NULL;
  64     }
  65 
  66     CGDisplayCount i;
  67     CGDisplayCount displayActiveCount = 0; //Active and sleeping.
  68     for (i = 0; i < displayCount; ++i) {
  69         if (CGDisplayMirrorsDisplay(displays[i]) == kCGNullDirectDisplay) {
  70             ++displayActiveCount;
  71         } else {
  72             displays[i] = kCGNullDirectDisplay;
  73         }
  74     }
  75 
  76     /* Allocate a java array for display identifiers */
  77     ret = JNFNewIntArray(env, displayActiveCount);
  78 
  79     /* Initialize and return the backing int array */
  80     assert(sizeof(jint) >= sizeof(CGDirectDisplayID));
  81     jint *elems = (*env)->GetIntArrayElements(env, ret, 0);
  82     CHECK_NULL_RETURN(elems, NULL);
  83 
  84     /* Filter out the mirrored displays */
  85     for (i = 0; i < displayCount; ++i) {
  86         if (displays[i] != kCGNullDirectDisplay) {
  87             elems[--displayActiveCount] = displays[i];
  88         }
  89     }
  90 
  91     (*env)->ReleaseIntArrayElements(env, ret, elems, 0);
  92 
  93 JNF_COCOA_EXIT(env);
  94 
  95     return ret;
  96 }
  97 
  98 /*
  99  * Class:     sun_awt_CGraphicsEnvironment
 100  * Method:    getMainDisplayID
 101  * Signature: ()I
 102  */
 103 JNIEXPORT jint JNICALL
 104 Java_sun_awt_CGraphicsEnvironment_getMainDisplayID
 105 (JNIEnv *env, jclass class)
 106 {
 107     return CGMainDisplayID();
 108 }
 109 
 110 /*
 111  * Post the display reconfiguration event.
 112  */
 113 static void displaycb_handle
 114 (CGDirectDisplayID display, CGDisplayChangeSummaryFlags flags, void *userInfo)
 115 {
 116     if (flags == kCGDisplayBeginConfigurationFlag) return;
 117 
 118     [ThreadUtilities performOnMainThreadWaiting:NO block:^() {
 119 
 120         JNFPerformEnvBlock(JNFThreadDetachImmediately, ^(JNIEnv *env) {
 121             JNFWeakJObjectWrapper *wrapper = (JNFWeakJObjectWrapper *)userInfo;
 122 
 123             jobject graphicsEnv = [wrapper jObjectWithEnv:env];
 124             if (graphicsEnv == NULL) return; // ref already GC'd
 125             static JNF_CLASS_CACHE(jc_CGraphicsEnvironment, "sun/awt/CGraphicsEnvironment");
 126             static JNF_MEMBER_CACHE(jm_displayReconfiguration,
 127                     jc_CGraphicsEnvironment, "_displayReconfiguration","(IZ)V");
 128             JNFCallVoidMethod(env, graphicsEnv, jm_displayReconfiguration,
 129                     (jint) display, (jboolean) flags & kCGDisplayRemoveFlag);
 130         });
 131     }];
 132 }
 133 
 134 /*
 135  * Class:     sun_awt_CGraphicsEnvironment
 136  * Method:    registerDisplayReconfiguration
 137  * Signature: ()J
 138  */
 139 JNIEXPORT jlong JNICALL
 140 Java_sun_awt_CGraphicsEnvironment_registerDisplayReconfiguration
 141 (JNIEnv *env, jobject this)
 142 {
 143     jlong ret = 0L;
 144 
 145 JNF_COCOA_ENTER(env);
 146 
 147     JNFWeakJObjectWrapper *wrapper = [[JNFWeakJObjectWrapper wrapperWithJObject:this withEnv:env] retain];
 148 
 149     /* Register the callback */
 150     if (CGDisplayRegisterReconfigurationCallback(&displaycb_handle, wrapper) != kCGErrorSuccess) {
 151         [JNFException raise:env
 152                          as:kInternalError
 153                      reason:"CGDisplayRegisterReconfigurationCallback() failed"];
 154         return 0L;
 155     }
 156 
 157     ret = ptr_to_jlong(wrapper);
 158 
 159 JNF_COCOA_EXIT(env);
 160 
 161     return ret;
 162 }
 163 
 164 /*
 165  * Class:     sun_awt_CGraphicsEnvironment
 166  * Method:    deregisterDisplayReconfiguration
 167  * Signature: (J)V
 168  */
 169 JNIEXPORT void JNICALL
 170 Java_sun_awt_CGraphicsEnvironment_deregisterDisplayReconfiguration
 171 (JNIEnv *env, jobject this, jlong p)
 172 {
 173 JNF_COCOA_ENTER(env);
 174 
 175     JNFWeakJObjectWrapper *wrapper = (JNFWeakJObjectWrapper *)jlong_to_ptr(p);
 176     if (!wrapper) return;
 177 
 178     /* Remove the registration */
 179     if (CGDisplayRemoveReconfigurationCallback(&displaycb_handle, wrapper) != kCGErrorSuccess) {
 180         [JNFException raise:env
 181                          as:kInternalError
 182                      reason:"CGDisplayRemoveReconfigurationCallback() failed, leaking the callback context!"];
 183         return;
 184     }
 185 
 186     [wrapper setJObject:NULL withEnv:env]; // more efficiant to pre-clear
 187     [wrapper release];
 188 
 189 JNF_COCOA_EXIT(env);
 190 }