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 
  30 #import <JavaNativeFoundation/JavaNativeFoundation.h>
  31 
  32 #define MAX_DISPLAYS 64
  33 
  34 /*
  35  * Class:     sun_awt_CGraphicsEnvironment
  36  * Method:    getDisplayIDs
  37  * Signature: ()[I
  38  */
  39 JNIEXPORT jintArray JNICALL
  40 Java_sun_awt_CGraphicsEnvironment_getDisplayIDs
  41 (JNIEnv *env, jclass class)
  42 {
  43     jintArray ret = NULL;
  44 
  45 JNF_COCOA_ENTER(env);
  46 
  47     /* Get the count */
  48     CGDisplayCount displayCount;
  49     if (CGGetOnlineDisplayList(MAX_DISPLAYS, NULL, &displayCount) != kCGErrorSuccess) {
  50         [JNFException raise:env
  51                          as:kInternalError
  52                      reason:"CGGetOnlineDisplayList() failed to get display count"];
  53         return NULL;
  54     }
  55 
  56     /* Allocate an array and get the size list of display Ids */
  57     CGDirectDisplayID displays[MAX_DISPLAYS];
  58     if (CGGetOnlineDisplayList(displayCount, displays, &displayCount) != kCGErrorSuccess) {
  59         [JNFException raise:env
  60                          as:kInternalError
  61                      reason:"CGGetOnlineDisplayList() failed to get display list"];
  62         return NULL;
  63     }
  64 
  65     CGDisplayCount i;
  66     CGDisplayCount displayActiveCount = 0; //Active and sleeping.
  67     for (i = 0; i < displayCount; ++i) {
  68         if (CGDisplayMirrorsDisplay(displays[i]) == kCGNullDirectDisplay) {
  69             ++displayActiveCount;
  70         } else {
  71             displays[i] = kCGNullDirectDisplay;
  72         }
  73     }
  74 
  75     /* Allocate a java array for display identifiers */
  76     ret = JNFNewIntArray(env, displayActiveCount);
  77 
  78     /* Initialize and return the backing int array */
  79     assert(sizeof(jint) >= sizeof(CGDirectDisplayID));
  80     jint *elems = (*env)->GetIntArrayElements(env, ret, 0);
  81     CHECK_NULL_RETURN(elems, NULL);
  82 
  83     /* Filter out the mirrored displays */
  84     for (i = 0; i < displayCount; ++i) {
  85         if (displays[i] != kCGNullDirectDisplay) {
  86             elems[--displayActiveCount] = displays[i];
  87         }
  88     }
  89 
  90     (*env)->ReleaseIntArrayElements(env, ret, elems, 0);
  91 
  92 JNF_COCOA_EXIT(env);
  93 
  94     return ret;
  95 }
  96 
  97 /*
  98  * Class:     sun_awt_CGraphicsEnvironment
  99  * Method:    getMainDisplayID
 100  * Signature: ()I
 101  */
 102 JNIEXPORT jint JNICALL
 103 Java_sun_awt_CGraphicsEnvironment_getMainDisplayID
 104 (JNIEnv *env, jclass class)
 105 {
 106     return CGMainDisplayID();
 107 }
 108 
 109 /*
 110  * Post the display reconfiguration event.
 111  */
 112 static void displaycb_handle
 113 (CGDirectDisplayID display, CGDisplayChangeSummaryFlags flags, void *userInfo)
 114 {
 115     if (flags == kCGDisplayBeginConfigurationFlag) return;
 116 
 117     JNFPerformEnvBlock(JNFThreadDetachImmediately, ^(JNIEnv *env) {
 118         JNFWeakJObjectWrapper *wrapper = (JNFWeakJObjectWrapper *)userInfo;
 119 
 120         jobject graphicsEnv = [wrapper jObjectWithEnv:env];
 121         if (graphicsEnv == NULL) return; // ref already GC'd
 122         static JNF_CLASS_CACHE(jc_CGraphicsEnvironment, "sun/awt/CGraphicsEnvironment");
 123         static JNF_MEMBER_CACHE(jm_displayReconfiguration, jc_CGraphicsEnvironment, "_displayReconfiguration", "(IZ)V");
 124         JNFCallVoidMethod(env, graphicsEnv, jm_displayReconfiguration,
 125                             (jint) display, 
 126                             (jboolean) flags & kCGDisplayRemoveFlag);
 127     });
 128 }
 129 
 130 /*
 131  * Class:     sun_awt_CGraphicsEnvironment
 132  * Method:    registerDisplayReconfiguration
 133  * Signature: ()J
 134  */
 135 JNIEXPORT jlong JNICALL
 136 Java_sun_awt_CGraphicsEnvironment_registerDisplayReconfiguration
 137 (JNIEnv *env, jobject this)
 138 {
 139     jlong ret = 0L;
 140 
 141 JNF_COCOA_ENTER(env);
 142 
 143     JNFWeakJObjectWrapper *wrapper = [[JNFWeakJObjectWrapper wrapperWithJObject:this withEnv:env] retain];
 144 
 145     /* Register the callback */
 146     if (CGDisplayRegisterReconfigurationCallback(&displaycb_handle, wrapper) != kCGErrorSuccess) {
 147         [JNFException raise:env
 148                          as:kInternalError
 149                      reason:"CGDisplayRegisterReconfigurationCallback() failed"];
 150         return 0L;
 151     }
 152 
 153     ret = ptr_to_jlong(wrapper);
 154 
 155 JNF_COCOA_EXIT(env);
 156 
 157     return ret;
 158 }
 159 
 160 /*
 161  * Class:     sun_awt_CGraphicsEnvironment
 162  * Method:    deregisterDisplayReconfiguration
 163  * Signature: (J)V
 164  */
 165 JNIEXPORT void JNICALL
 166 Java_sun_awt_CGraphicsEnvironment_deregisterDisplayReconfiguration
 167 (JNIEnv *env, jobject this, jlong p)
 168 {
 169 JNF_COCOA_ENTER(env);
 170 
 171     JNFWeakJObjectWrapper *wrapper = (JNFWeakJObjectWrapper *)jlong_to_ptr(p);
 172     if (!wrapper) return;
 173 
 174     /* Remove the registration */
 175     if (CGDisplayRemoveReconfigurationCallback(&displaycb_handle, wrapper) != kCGErrorSuccess) {
 176         [JNFException raise:env
 177                          as:kInternalError
 178                      reason:"CGDisplayRemoveReconfigurationCallback() failed, leaking the callback context!"];
 179         return;
 180     }
 181 
 182     [wrapper setJObject:NULL withEnv:env]; // more efficiant to pre-clear
 183     [wrapper release];
 184 
 185 JNF_COCOA_EXIT(env);
 186 }
--- EOF ---