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 }