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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 <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 
     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 
     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 
     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 
    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