1 /*
   2  * Copyright (c) 2011, 2014, 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 <JavaNativeFoundation/JavaNativeFoundation.h>
  27 
  28 #import "jni_util.h"
  29 #import "LWCToolkit.h"
  30 #import "AWT_debug.h"
  31 
  32 
  33 /*
  34  * Class:     sun_awt_CGraphicsEnvironment
  35  * Method:    initCocoa
  36  * Signature: ()V
  37  */
  38 JNIEXPORT void JNICALL
  39 Java_sun_awt_CGraphicsEnvironment_initCocoa
  40 (JNIEnv *env, jclass self)
  41 {
  42 JNF_COCOA_ENTER(env);
  43 
  44     // Inform Cocoa that we're multi-threaded.
  45     // Creating a short-lived NSThread is the recommended way of doing so.
  46     [NSThread detachNewThreadSelector:@selector(self) toTarget:[NSObject class] withObject:nil];
  47 
  48 JNF_COCOA_EXIT(env);
  49 }
  50 
  51 #define MAX_DISPLAYS 64
  52 
  53 /*
  54  * Class:     sun_awt_CGraphicsEnvironment
  55  * Method:    getDisplayIDs
  56  * Signature: ()[I
  57  */
  58 JNIEXPORT jintArray JNICALL
  59 Java_sun_awt_CGraphicsEnvironment_getDisplayIDs
  60 (JNIEnv *env, jclass class)
  61 {
  62     jintArray ret = NULL;
  63 
  64 JNF_COCOA_ENTER(env);
  65 
  66     /* Get the count */
  67     CGDisplayCount displayCount;
  68     if (CGGetOnlineDisplayList(MAX_DISPLAYS, NULL, &displayCount) != kCGErrorSuccess) {
  69         [JNFException raise:env
  70                          as:kInternalError
  71                      reason:"CGGetOnlineDisplayList() failed to get display count"];
  72         return NULL;
  73     }
  74 
  75     /* Allocate an array and get the size list of display Ids */
  76     CGDirectDisplayID displays[MAX_DISPLAYS];
  77     if (CGGetOnlineDisplayList(displayCount, displays, &displayCount) != kCGErrorSuccess) {
  78         [JNFException raise:env
  79                          as:kInternalError
  80                      reason:"CGGetOnlineDisplayList() failed to get display list"];
  81         return NULL;
  82     }
  83 
  84     CGDisplayCount i;
  85     CGDisplayCount displayActiveCount = 0; //Active and sleeping.
  86     for (i = 0; i < displayCount; ++i) {
  87         if (CGDisplayMirrorsDisplay(displays[i]) == kCGNullDirectDisplay) {
  88             ++displayActiveCount;
  89         } else {
  90             displays[i] = kCGNullDirectDisplay;
  91         }
  92     }
  93 
  94     /* Allocate a java array for display identifiers */
  95     ret = JNFNewIntArray(env, displayActiveCount);
  96 
  97     /* Initialize and return the backing int array */
  98     assert(sizeof(jint) >= sizeof(CGDirectDisplayID));
  99     jint *elems = (*env)->GetIntArrayElements(env, ret, 0);
 100     CHECK_NULL_RETURN(elems, NULL);
 101 
 102     /* Filter out the mirrored displays */
 103     for (i = 0; i < displayCount; ++i) {
 104         if (displays[i] != kCGNullDirectDisplay) {
 105             elems[--displayActiveCount] = displays[i];
 106         }
 107     }
 108 
 109     (*env)->ReleaseIntArrayElements(env, ret, elems, 0);
 110 
 111 JNF_COCOA_EXIT(env);
 112 
 113     return ret;
 114 }
 115 
 116 /*
 117  * Class:     sun_awt_CGraphicsEnvironment
 118  * Method:    getMainDisplayID
 119  * Signature: ()I
 120  */
 121 JNIEXPORT jint JNICALL
 122 Java_sun_awt_CGraphicsEnvironment_getMainDisplayID
 123 (JNIEnv *env, jclass class)
 124 {
 125     return CGMainDisplayID();
 126 }
 127 
 128 /*
 129  * Post the display reconfiguration event.
 130  */
 131 static void displaycb_handle
 132 (CGDirectDisplayID display, CGDisplayChangeSummaryFlags flags, void *userInfo)
 133 {
 134     if (flags == kCGDisplayBeginConfigurationFlag) return;
 135 
 136     JNFPerformEnvBlock(JNFThreadDetachImmediately, ^(JNIEnv *env) {
 137         JNFWeakJObjectWrapper *wrapper = (JNFWeakJObjectWrapper *)userInfo;
 138 
 139         jobject graphicsEnv = [wrapper jObjectWithEnv:env];
 140         if (graphicsEnv == NULL) return; // ref already GC'd
 141         static JNF_CLASS_CACHE(jc_CGraphicsEnvironment, "sun/awt/CGraphicsEnvironment");
 142         static JNF_MEMBER_CACHE(jm_displayReconfiguration, jc_CGraphicsEnvironment, "_displayReconfiguration", "(IZ)V");
 143         JNFCallVoidMethod(env, graphicsEnv, jm_displayReconfiguration,
 144                             (jint) display, 
 145                             (jboolean) flags & kCGDisplayRemoveFlag);
 146     });
 147 }
 148 
 149 /*
 150  * Class:     sun_awt_CGraphicsEnvironment
 151  * Method:    registerDisplayReconfiguration
 152  * Signature: ()J
 153  */
 154 JNIEXPORT jlong JNICALL
 155 Java_sun_awt_CGraphicsEnvironment_registerDisplayReconfiguration
 156 (JNIEnv *env, jobject this)
 157 {
 158     jlong ret = 0L;
 159 
 160 JNF_COCOA_ENTER(env);
 161 
 162     JNFWeakJObjectWrapper *wrapper = [[JNFWeakJObjectWrapper wrapperWithJObject:this withEnv:env] retain];
 163 
 164     /* Register the callback */
 165     if (CGDisplayRegisterReconfigurationCallback(&displaycb_handle, wrapper) != kCGErrorSuccess) {
 166         [JNFException raise:env
 167                          as:kInternalError
 168                      reason:"CGDisplayRegisterReconfigurationCallback() failed"];
 169         return 0L;
 170     }
 171 
 172     ret = ptr_to_jlong(wrapper);
 173 
 174 JNF_COCOA_EXIT(env);
 175 
 176     return ret;
 177 }
 178 
 179 /*
 180  * Class:     sun_awt_CGraphicsEnvironment
 181  * Method:    deregisterDisplayReconfiguration
 182  * Signature: (J)V
 183  */
 184 JNIEXPORT void JNICALL
 185 Java_sun_awt_CGraphicsEnvironment_deregisterDisplayReconfiguration
 186 (JNIEnv *env, jobject this, jlong p)
 187 {
 188 JNF_COCOA_ENTER(env);
 189 
 190     JNFWeakJObjectWrapper *wrapper = (JNFWeakJObjectWrapper *)jlong_to_ptr(p);
 191     if (!wrapper) return;
 192 
 193     /* Remove the registration */
 194     if (CGDisplayRemoveReconfigurationCallback(&displaycb_handle, wrapper) != kCGErrorSuccess) {
 195         [JNFException raise:env
 196                          as:kInternalError
 197                      reason:"CGDisplayRemoveReconfigurationCallback() failed, leaking the callback context!"];
 198         return;
 199     }
 200 
 201     [wrapper setJObject:NULL withEnv:env]; // more efficiant to pre-clear
 202     [wrapper release];
 203 
 204 JNF_COCOA_EXIT(env);
 205 }
--- EOF ---