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      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 <android_runtime/Log.h>
     25 #include <utils/Log.h>
     26 #include <android/graphics/GraphicsJNI.h>
     27 
     28 namespace android {
     29 
     30 static struct {
     31     jclass clazz;
     32     jfieldID mStyle;
     33     jfieldID mBitmap;
     34     jfieldID mHotSpotX;
     35     jfieldID mHotSpotY;
     36     jmethodID getSystemIcon;
     37     jmethodID load;
     38 } gPointerIconClassInfo;
     39 
     40 
     41 // --- Global Functions ---
     42 
     43 jobject android_view_PointerIcon_getSystemIcon(JNIEnv* env, jobject contextObj, int32_t style) {
     44     jobject pointerIconObj = env->CallStaticObjectMethod(gPointerIconClassInfo.clazz,
     45             gPointerIconClassInfo.getSystemIcon, contextObj, style);
     46     if (env->ExceptionCheck()) {
     47         ALOGW("An exception occurred while getting a pointer icon with style %d.", style);
     48         LOGW_EX(env);
     49         env->ExceptionClear();
     50         return NULL;
     51     }
     52     return pointerIconObj;
     53 }
     54 
     55 status_t android_view_PointerIcon_load(JNIEnv* env, jobject pointerIconObj, jobject contextObj,
     56         PointerIcon* outPointerIcon) {
     57     outPointerIcon->reset();
     58 
     59     if (!pointerIconObj) {
     60         return OK;
     61     }
     62 
     63     jobject loadedPointerIconObj = env->CallObjectMethod(pointerIconObj,
     64             gPointerIconClassInfo.load, contextObj);
     65     if (env->ExceptionCheck() || !loadedPointerIconObj) {
     66         ALOGW("An exception occurred while loading a pointer icon.");
     67         LOGW_EX(env);
     68         env->ExceptionClear();
     69         return UNKNOWN_ERROR;
     70     }
     71 
     72     outPointerIcon->style = env->GetIntField(loadedPointerIconObj,
     73             gPointerIconClassInfo.mStyle);
     74     outPointerIcon->hotSpotX = env->GetFloatField(loadedPointerIconObj,
     75             gPointerIconClassInfo.mHotSpotX);
     76     outPointerIcon->hotSpotY = env->GetFloatField(loadedPointerIconObj,
     77             gPointerIconClassInfo.mHotSpotY);
     78 
     79     jobject bitmapObj = env->GetObjectField(loadedPointerIconObj, gPointerIconClassInfo.mBitmap);
     80     if (bitmapObj) {
     81         SkBitmap* bitmap = GraphicsJNI::getNativeBitmap(env, bitmapObj);
     82         if (bitmap) {
     83             outPointerIcon->bitmap = *bitmap; // use a shared pixel ref
     84         }
     85         env->DeleteLocalRef(bitmapObj);
     86     }
     87 
     88     env->DeleteLocalRef(loadedPointerIconObj);
     89     return OK;
     90 }
     91 
     92 status_t android_view_PointerIcon_loadSystemIcon(JNIEnv* env, jobject contextObj,
     93         int32_t style, PointerIcon* outPointerIcon) {
     94     jobject pointerIconObj = android_view_PointerIcon_getSystemIcon(env, contextObj, style);
     95     if (!pointerIconObj) {
     96         outPointerIcon->reset();
     97         return UNKNOWN_ERROR;
     98     }
     99 
    100     status_t status = android_view_PointerIcon_load(env, pointerIconObj,
    101             contextObj, outPointerIcon);
    102     env->DeleteLocalRef(pointerIconObj);
    103     return status;
    104 }
    105 
    106 
    107 // --- JNI Registration ---
    108 
    109 #define FIND_CLASS(var, className) \
    110         var = env->FindClass(className); \
    111         LOG_FATAL_IF(! var, "Unable to find class " className); \
    112         var = jclass(env->NewGlobalRef(var));
    113 
    114 #define GET_STATIC_METHOD_ID(var, clazz, methodName, methodDescriptor) \
    115         var = env->GetStaticMethodID(clazz, methodName, methodDescriptor); \
    116         LOG_FATAL_IF(! var, "Unable to find method " methodName);
    117 
    118 #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
    119         var = env->GetMethodID(clazz, methodName, methodDescriptor); \
    120         LOG_FATAL_IF(! var, "Unable to find method " methodName);
    121 
    122 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
    123         var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
    124         LOG_FATAL_IF(! var, "Unable to find field " fieldName);
    125 
    126 int register_android_view_PointerIcon(JNIEnv* env) {
    127     FIND_CLASS(gPointerIconClassInfo.clazz, "android/view/PointerIcon");
    128 
    129     GET_FIELD_ID(gPointerIconClassInfo.mBitmap, gPointerIconClassInfo.clazz,
    130             "mBitmap", "Landroid/graphics/Bitmap;");
    131 
    132     GET_FIELD_ID(gPointerIconClassInfo.mStyle, gPointerIconClassInfo.clazz,
    133             "mStyle", "I");
    134 
    135     GET_FIELD_ID(gPointerIconClassInfo.mHotSpotX, gPointerIconClassInfo.clazz,
    136             "mHotSpotX", "F");
    137 
    138     GET_FIELD_ID(gPointerIconClassInfo.mHotSpotY, gPointerIconClassInfo.clazz,
    139             "mHotSpotY", "F");
    140 
    141     GET_STATIC_METHOD_ID(gPointerIconClassInfo.getSystemIcon, gPointerIconClassInfo.clazz,
    142             "getSystemIcon", "(Landroid/content/Context;I)Landroid/view/PointerIcon;");
    143 
    144     GET_METHOD_ID(gPointerIconClassInfo.load, gPointerIconClassInfo.clazz,
    145             "load", "(Landroid/content/Context;)Landroid/view/PointerIcon;");
    146 
    147     return 0;
    148 }
    149 
    150 } // namespace android
    151