1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "PointerIcon-JNI"
18
19 #include "JNIHelp.h"
20
21 #include "android_view_PointerIcon.h"
22
23 #include <android_runtime/AndroidRuntime.h>
24 #include <utils/Log.h>
25 #include <android/graphics/GraphicsJNI.h>
26
27 namespace android {
28
29 static struct {
30 jclass clazz;
31 jfieldID mStyle;
32 jfieldID mBitmap;
33 jfieldID mHotSpotX;
34 jfieldID mHotSpotY;
35 jmethodID getSystemIcon;
36 jmethodID load;
37 } gPointerIconClassInfo;
38
39
40 // --- Global Functions ---
41
android_view_PointerIcon_getSystemIcon(JNIEnv * env,jobject contextObj,int32_t style)42 jobject android_view_PointerIcon_getSystemIcon(JNIEnv* env, jobject contextObj, int32_t style) {
43 jobject pointerIconObj = env->CallStaticObjectMethod(gPointerIconClassInfo.clazz,
44 gPointerIconClassInfo.getSystemIcon, contextObj, style);
45 if (env->ExceptionCheck()) {
46 ALOGW("An exception occurred while getting a pointer icon with style %d.", style);
47 LOGW_EX(env);
48 env->ExceptionClear();
49 return NULL;
50 }
51 return pointerIconObj;
52 }
53
android_view_PointerIcon_load(JNIEnv * env,jobject pointerIconObj,jobject contextObj,PointerIcon * outPointerIcon)54 status_t android_view_PointerIcon_load(JNIEnv* env, jobject pointerIconObj, jobject contextObj,
55 PointerIcon* outPointerIcon) {
56 outPointerIcon->reset();
57
58 if (!pointerIconObj) {
59 return OK;
60 }
61
62 jobject loadedPointerIconObj = env->CallObjectMethod(pointerIconObj,
63 gPointerIconClassInfo.load, contextObj);
64 if (env->ExceptionCheck() || !loadedPointerIconObj) {
65 ALOGW("An exception occurred while loading a pointer icon.");
66 LOGW_EX(env);
67 env->ExceptionClear();
68 return UNKNOWN_ERROR;
69 }
70
71 outPointerIcon->style = env->GetIntField(loadedPointerIconObj,
72 gPointerIconClassInfo.mStyle);
73 outPointerIcon->hotSpotX = env->GetFloatField(loadedPointerIconObj,
74 gPointerIconClassInfo.mHotSpotX);
75 outPointerIcon->hotSpotY = env->GetFloatField(loadedPointerIconObj,
76 gPointerIconClassInfo.mHotSpotY);
77
78 jobject bitmapObj = env->GetObjectField(loadedPointerIconObj, gPointerIconClassInfo.mBitmap);
79 if (bitmapObj) {
80 SkBitmap* bitmap = GraphicsJNI::getNativeBitmap(env, bitmapObj);
81 if (bitmap) {
82 outPointerIcon->bitmap = *bitmap; // use a shared pixel ref
83 }
84 env->DeleteLocalRef(bitmapObj);
85 }
86
87 env->DeleteLocalRef(loadedPointerIconObj);
88 return OK;
89 }
90
android_view_PointerIcon_loadSystemIcon(JNIEnv * env,jobject contextObj,int32_t style,PointerIcon * outPointerIcon)91 status_t android_view_PointerIcon_loadSystemIcon(JNIEnv* env, jobject contextObj,
92 int32_t style, PointerIcon* outPointerIcon) {
93 jobject pointerIconObj = android_view_PointerIcon_getSystemIcon(env, contextObj, style);
94 if (!pointerIconObj) {
95 outPointerIcon->reset();
96 return UNKNOWN_ERROR;
97 }
98
99 status_t status = android_view_PointerIcon_load(env, pointerIconObj,
100 contextObj, outPointerIcon);
101 env->DeleteLocalRef(pointerIconObj);
102 return status;
103 }
104
105
106 // --- JNI Registration ---
107
108 #define FIND_CLASS(var, className) \
109 var = env->FindClass(className); \
110 LOG_FATAL_IF(! var, "Unable to find class " className); \
111 var = jclass(env->NewGlobalRef(var));
112
113 #define GET_STATIC_METHOD_ID(var, clazz, methodName, methodDescriptor) \
114 var = env->GetStaticMethodID(clazz, methodName, methodDescriptor); \
115 LOG_FATAL_IF(! var, "Unable to find method " methodName);
116
117 #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
118 var = env->GetMethodID(clazz, methodName, methodDescriptor); \
119 LOG_FATAL_IF(! var, "Unable to find method " methodName);
120
121 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
122 var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
123 LOG_FATAL_IF(! var, "Unable to find field " fieldName);
124
register_android_view_PointerIcon(JNIEnv * env)125 int register_android_view_PointerIcon(JNIEnv* env) {
126 FIND_CLASS(gPointerIconClassInfo.clazz, "android/view/PointerIcon");
127
128 GET_FIELD_ID(gPointerIconClassInfo.mBitmap, gPointerIconClassInfo.clazz,
129 "mBitmap", "Landroid/graphics/Bitmap;");
130
131 GET_FIELD_ID(gPointerIconClassInfo.mStyle, gPointerIconClassInfo.clazz,
132 "mStyle", "I");
133
134 GET_FIELD_ID(gPointerIconClassInfo.mHotSpotX, gPointerIconClassInfo.clazz,
135 "mHotSpotX", "F");
136
137 GET_FIELD_ID(gPointerIconClassInfo.mHotSpotY, gPointerIconClassInfo.clazz,
138 "mHotSpotY", "F");
139
140 GET_STATIC_METHOD_ID(gPointerIconClassInfo.getSystemIcon, gPointerIconClassInfo.clazz,
141 "getSystemIcon", "(Landroid/content/Context;I)Landroid/view/PointerIcon;");
142
143 GET_METHOD_ID(gPointerIconClassInfo.load, gPointerIconClassInfo.clazz,
144 "load", "(Landroid/content/Context;)Landroid/view/PointerIcon;");
145
146 return 0;
147 }
148
149 } // namespace android
150