1 /*
2 * Copyright (c) 2012, 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 #include "LWCToolkit.h"
27
28 /*
29 * Convert the mode string to the more convinient bits per pixel value
30 */
31 static int getBPPFromModeString(CFStringRef mode)
32 {
33 if ((CFStringCompare(mode, CFSTR(kIO30BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)) {
34 // This is a strange mode, where we using 10 bits per RGB component and pack it into 32 bits
35 // Java is not ready to work with this mode but we have to specify it as supported
36 return 30;
37 }
38 else if (CFStringCompare(mode, CFSTR(IO32BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
39 return 32;
40 }
41 else if (CFStringCompare(mode, CFSTR(IO16BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
42 return 16;
43 }
44 else if (CFStringCompare(mode, CFSTR(IO8BitIndexedPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
45 return 8;
46 }
47
48 return 0;
49 }
50
51 /*
52 * Find the best possible match in the list of display modes that we can switch to based on
53 * the provided parameters.
54 */
55 static CGDisplayModeRef getBestModeForParameters(CFArrayRef allModes, int w, int h, int bpp, int refrate) {
56 CGDisplayModeRef bestGuess = NULL;
57 CFIndex numModes = CFArrayGetCount(allModes), n;
58 int thisBpp = 0;
59 for(n = 0; n < numModes; n++ ) {
60 CGDisplayModeRef cRef = (CGDisplayModeRef) CFArrayGetValueAtIndex(allModes, n);
61 if(cRef == NULL) {
62 continue;
63 }
64 CFStringRef modeString = CGDisplayModeCopyPixelEncoding(cRef);
65 thisBpp = getBPPFromModeString(modeString);
66 CFRelease(modeString);
67 if (thisBpp != bpp || (int)CGDisplayModeGetHeight(cRef) != h || (int)CGDisplayModeGetWidth(cRef) != w) {
68 // One of the key parameters does not match
69 continue;
70 }
71 // Refresh rate might be 0 in display mode and we ask for specific display rate
72 // but if we do not find exact match then 0 refresh rate might be just Ok
73 if (CGDisplayModeGetRefreshRate(cRef) == refrate) {
74 // Exact match
75 return cRef;
76 }
77 if (CGDisplayModeGetRefreshRate(cRef) == 0) {
78 // Not exactly what was asked for, but may fit our needs if we don't find an exact match
79 bestGuess = cRef;
80 }
81 }
82 return bestGuess;
83 }
84
85 /*
86 * Create a new java.awt.DisplayMode instance based on provided CGDisplayModeRef
87 */
88 static jobject createJavaDisplayMode(CGDisplayModeRef mode, JNIEnv *env, jint displayID) {
89 jobject ret = NULL;
90 jint h, w, bpp, refrate;
91 JNF_COCOA_ENTER(env);
92 CFStringRef currentBPP = CGDisplayModeCopyPixelEncoding(mode);
93 bpp = getBPPFromModeString(currentBPP);
94 refrate = CGDisplayModeGetRefreshRate(mode);
95 h = CGDisplayModeGetHeight(mode);
96 w = CGDisplayModeGetWidth(mode);
97 CFRelease(currentBPP);
98 static JNF_CLASS_CACHE(jc_DisplayMode, "java/awt/DisplayMode");
99 static JNF_CTOR_CACHE(jc_DisplayMode_ctor, jc_DisplayMode, "(IIII)V");
100 ret = JNFNewObject(env, jc_DisplayMode_ctor, w, h, bpp, refrate);
101 JNF_COCOA_EXIT(env);
102 return ret;
103 }
104
105
106 /*
107 * Class: sun_awt_CGraphicsDevice
108 * Method: nativeGetXResolution
109 * Signature: (I)D
110 */
111 JNIEXPORT jdouble JNICALL
112 Java_sun_awt_CGraphicsDevice_nativeGetXResolution
113 (JNIEnv *env, jclass class, jint displayID)
114 {
115 // TODO: this is the physically correct answer, but we probably want
116 // to use NSScreen API instead...
117 CGSize size = CGDisplayScreenSize(displayID);
118 CGRect rect = CGDisplayBounds(displayID);
119 // 1 inch == 25.4 mm
120 jfloat inches = size.width / 25.4f;
121 jfloat dpi = rect.size.width / inches;
122 return dpi;
123 }
124
125 /*
126 * Class: sun_awt_CGraphicsDevice
127 * Method: nativeGetYResolution
128 * Signature: (I)D
129 */
130 JNIEXPORT jdouble JNICALL
131 Java_sun_awt_CGraphicsDevice_nativeGetYResolution
132 (JNIEnv *env, jclass class, jint displayID)
133 {
134 // TODO: this is the physically correct answer, but we probably want
135 // to use NSScreen API instead...
136 CGSize size = CGDisplayScreenSize(displayID);
137 CGRect rect = CGDisplayBounds(displayID);
138 // 1 inch == 25.4 mm
139 jfloat inches = size.height / 25.4f;
140 jfloat dpi = rect.size.height / inches;
141 return dpi;
142 }
143
144 /*
145 * Class: sun_awt_CGraphicsDevice
146 * Method: nativeSetDisplayMode
147 * Signature: (IIIII)V
148 */
149 JNIEXPORT void JNICALL
150 Java_sun_awt_CGraphicsDevice_nativeSetDisplayMode
151 (JNIEnv *env, jclass class, jint displayID, jint w, jint h, jint bpp, jint refrate)
152 {
153 JNF_COCOA_ENTER(env);
154 CFArrayRef allModes = CGDisplayCopyAllDisplayModes(displayID, NULL);
155 CGDisplayModeRef closestMatch = getBestModeForParameters(allModes, (int)w, (int)h, (int)bpp, (int)refrate);
156 if (closestMatch != NULL) {
157 [JNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
158 CGDisplayConfigRef config;
159 CGError retCode = CGBeginDisplayConfiguration(&config);
160 if (retCode == kCGErrorSuccess) {
161 CGConfigureDisplayWithDisplayMode(config, displayID, closestMatch, NULL);
162 CGCompleteDisplayConfiguration(config, kCGConfigureForAppOnly);
163 if (config != NULL) {
164 CFRelease(config);
165 }
166 }
167 }];
168 }
169 CFRelease(allModes);
170 JNF_COCOA_EXIT(env);
171 }
172
173 /*
174 * Class: sun_awt_CGraphicsDevice
175 * Method: nativeGetDisplayMode
176 * Signature: (I)Ljava/awt/DisplayMode
177 */
178 JNIEXPORT jobject JNICALL
179 Java_sun_awt_CGraphicsDevice_nativeGetDisplayMode
180 (JNIEnv *env, jclass class, jint displayID)
181 {
182 jobject ret = NULL;
183 CGDisplayModeRef currentMode = CGDisplayCopyDisplayMode(displayID);
184 ret = createJavaDisplayMode(currentMode, env, displayID);
185 CGDisplayModeRelease(currentMode);
186 return ret;
187 }
188
189 /*
190 * Class: sun_awt_CGraphicsDevice
191 * Method: nativeGetDisplayMode
192 * Signature: (I)[Ljava/awt/DisplayModes
193 */
194 JNIEXPORT jobjectArray JNICALL
195 Java_sun_awt_CGraphicsDevice_nativeGetDisplayModes
196 (JNIEnv *env, jclass class, jint displayID)
197 {
198 jobjectArray jreturnArray = NULL;
199 JNF_COCOA_ENTER(env);
200 CFArrayRef allModes = CGDisplayCopyAllDisplayModes(displayID, NULL);
201 CFIndex numModes = CFArrayGetCount(allModes);
202 static JNF_CLASS_CACHE(jc_DisplayMode, "java/awt/DisplayMode");
203
204 jreturnArray = JNFNewObjectArray(env, &jc_DisplayMode, (jsize) numModes);
205 if (!jreturnArray) {
206 NSLog(@"CGraphicsDevice can't create java array of DisplayMode objects");
207 return nil;
208 }
209
210 CFIndex n;
211 for (n=0; n < numModes; n++) {
212 CGDisplayModeRef cRef = (CGDisplayModeRef) CFArrayGetValueAtIndex(allModes, n);
213 if (cRef != NULL) {
214 jobject oneMode = createJavaDisplayMode(cRef, env, displayID);
215 (*env)->SetObjectArrayElement(env, jreturnArray, n, oneMode);
216 if ((*env)->ExceptionOccurred(env)) {
217 (*env)->ExceptionDescribe(env);
218 (*env)->ExceptionClear(env);
219 continue;
220 }
221 (*env)->DeleteLocalRef(env, oneMode);
222 }
223 }
224 CFRelease(allModes);
225 JNF_COCOA_EXIT(env);
226
227 return jreturnArray;
228 }