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
27namespace android {
28
29static 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
42jobject 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
54status_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
91status_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
125int 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