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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 #include "ScopedLocalRef.h"
     28 
     29 #include "core_jni_helpers.h"
     30 
     31 namespace android {
     32 
     33 static struct {
     34     jclass clazz;
     35     jfieldID mType;
     36     jfieldID mBitmap;
     37     jfieldID mHotSpotX;
     38     jfieldID mHotSpotY;
     39     jfieldID mBitmapFrames;
     40     jfieldID mDurationPerFrame;
     41     jmethodID getSystemIcon;
     42     jmethodID load;
     43 } gPointerIconClassInfo;
     44 
     45 
     46 // --- Global Functions ---
     47 
     48 jobject android_view_PointerIcon_getSystemIcon(JNIEnv* env, jobject contextObj, int32_t style) {
     49     jobject pointerIconObj = env->CallStaticObjectMethod(gPointerIconClassInfo.clazz,
     50             gPointerIconClassInfo.getSystemIcon, contextObj, style);
     51     if (env->ExceptionCheck()) {
     52         ALOGW("An exception occurred while getting a pointer icon with style %d.", style);
     53         LOGW_EX(env);
     54         env->ExceptionClear();
     55         return NULL;
     56     }
     57     return pointerIconObj;
     58 }
     59 
     60 status_t android_view_PointerIcon_load(JNIEnv* env, jobject pointerIconObj, jobject contextObj,
     61         PointerIcon* outPointerIcon) {
     62     outPointerIcon->reset();
     63 
     64     if (!pointerIconObj) {
     65         return OK;
     66     }
     67 
     68     ScopedLocalRef<jobject> loadedPointerIconObj(env, env->CallObjectMethod(pointerIconObj,
     69             gPointerIconClassInfo.load, contextObj));
     70     if (env->ExceptionCheck() || !loadedPointerIconObj.get()) {
     71         ALOGW("An exception occurred while loading a pointer icon.");
     72         LOGW_EX(env);
     73         env->ExceptionClear();
     74         return UNKNOWN_ERROR;
     75     }
     76     return android_view_PointerIcon_getLoadedIcon(env, loadedPointerIconObj.get(), outPointerIcon);
     77 }
     78 
     79 status_t android_view_PointerIcon_getLoadedIcon(JNIEnv* env, jobject pointerIconObj,
     80         PointerIcon* outPointerIcon) {
     81     outPointerIcon->style = env->GetIntField(pointerIconObj, gPointerIconClassInfo.mType);
     82     outPointerIcon->hotSpotX = env->GetFloatField(pointerIconObj, gPointerIconClassInfo.mHotSpotX);
     83     outPointerIcon->hotSpotY = env->GetFloatField(pointerIconObj, gPointerIconClassInfo.mHotSpotY);
     84 
     85     ScopedLocalRef<jobject> bitmapObj(
     86             env, env->GetObjectField(pointerIconObj, gPointerIconClassInfo.mBitmap));
     87     if (bitmapObj.get()) {
     88         GraphicsJNI::getSkBitmap(env, bitmapObj.get(), &(outPointerIcon->bitmap));
     89     }
     90 
     91     ScopedLocalRef<jobjectArray> bitmapFramesObj(env, reinterpret_cast<jobjectArray>(
     92             env->GetObjectField(pointerIconObj, gPointerIconClassInfo.mBitmapFrames)));
     93     if (bitmapFramesObj.get()) {
     94         outPointerIcon->durationPerFrame = env->GetIntField(
     95                 pointerIconObj, gPointerIconClassInfo.mDurationPerFrame);
     96         jsize size = env->GetArrayLength(bitmapFramesObj.get());
     97         outPointerIcon->bitmapFrames.resize(size);
     98         for (jsize i = 0; i < size; ++i) {
     99             ScopedLocalRef<jobject> bitmapObj(env, env->GetObjectArrayElement(bitmapFramesObj.get(), i));
    100             GraphicsJNI::getSkBitmap(env, bitmapObj.get(), &(outPointerIcon->bitmapFrames[i]));
    101         }
    102     }
    103 
    104     return OK;
    105 }
    106 
    107 status_t android_view_PointerIcon_loadSystemIcon(JNIEnv* env, jobject contextObj,
    108         int32_t style, PointerIcon* outPointerIcon) {
    109     jobject pointerIconObj = android_view_PointerIcon_getSystemIcon(env, contextObj, style);
    110     if (!pointerIconObj) {
    111         outPointerIcon->reset();
    112         return UNKNOWN_ERROR;
    113     }
    114 
    115     status_t status = android_view_PointerIcon_load(env, pointerIconObj,
    116             contextObj, outPointerIcon);
    117     env->DeleteLocalRef(pointerIconObj);
    118     return status;
    119 }
    120 
    121 
    122 // --- JNI Registration ---
    123 
    124 int register_android_view_PointerIcon(JNIEnv* env) {
    125     jclass clazz = FindClassOrDie(env, "android/view/PointerIcon");
    126     gPointerIconClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
    127 
    128     gPointerIconClassInfo.mBitmap = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
    129             "mBitmap", "Landroid/graphics/Bitmap;");
    130 
    131     gPointerIconClassInfo.mType = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
    132             "mType", "I");
    133 
    134     gPointerIconClassInfo.mHotSpotX = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
    135             "mHotSpotX", "F");
    136 
    137     gPointerIconClassInfo.mHotSpotY = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
    138             "mHotSpotY", "F");
    139 
    140     gPointerIconClassInfo.mBitmapFrames = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
    141             "mBitmapFrames", "[Landroid/graphics/Bitmap;");
    142 
    143     gPointerIconClassInfo.mDurationPerFrame = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
    144             "mDurationPerFrame", "I");
    145 
    146     gPointerIconClassInfo.getSystemIcon = GetStaticMethodIDOrDie(env, gPointerIconClassInfo.clazz,
    147             "getSystemIcon", "(Landroid/content/Context;I)Landroid/view/PointerIcon;");
    148 
    149     gPointerIconClassInfo.load = GetMethodIDOrDie(env, gPointerIconClassInfo.clazz,
    150             "load", "(Landroid/content/Context;)Landroid/view/PointerIcon;");
    151 
    152     return 0;
    153 }
    154 
    155 } // namespace android
    156