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      1 #define LOG_TAG "GraphicsJNI"
      2 
      3 #include "jni.h"
      4 #include "JNIHelp.h"
      5 #include "GraphicsJNI.h"
      6 
      7 #include "SkCanvas.h"
      8 #include "SkDevice.h"
      9 #include "SkPicture.h"
     10 #include "SkRegion.h"
     11 #include <android_runtime/AndroidRuntime.h>
     12 
     13 void doThrowNPE(JNIEnv* env) {
     14     jniThrowNullPointerException(env, NULL);
     15 }
     16 
     17 void doThrowAIOOBE(JNIEnv* env) {
     18     jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
     19 }
     20 
     21 void doThrowRE(JNIEnv* env, const char* msg) {
     22     jniThrowRuntimeException(env, msg);
     23 }
     24 
     25 void doThrowIAE(JNIEnv* env, const char* msg) {
     26     jniThrowException(env, "java/lang/IllegalArgumentException", msg);
     27 }
     28 
     29 void doThrowISE(JNIEnv* env, const char* msg) {
     30     jniThrowException(env, "java/lang/IllegalStateException", msg);
     31 }
     32 
     33 void doThrowOOME(JNIEnv* env, const char* msg) {
     34     jniThrowException(env, "java/lang/OutOfMemoryError", msg);
     35 }
     36 
     37 void doThrowIOE(JNIEnv* env, const char* msg) {
     38     jniThrowException(env, "java/io/IOException", msg);
     39 }
     40 
     41 bool GraphicsJNI::hasException(JNIEnv *env) {
     42     if (env->ExceptionCheck() != 0) {
     43         ALOGE("*** Uncaught exception returned from Java call!\n");
     44         env->ExceptionDescribe();
     45         return true;
     46     }
     47     return false;
     48 }
     49 
     50 ///////////////////////////////////////////////////////////////////////////////
     51 
     52 AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
     53                                        int minLength, JNIAccess access)
     54 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     55     SkASSERT(env);
     56     if (array) {
     57         fLen = env->GetArrayLength(array);
     58         if (fLen < minLength) {
     59             sk_throw();
     60         }
     61         fPtr = env->GetFloatArrayElements(array, NULL);
     62     }
     63     fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
     64 }
     65 
     66 AutoJavaFloatArray::~AutoJavaFloatArray() {
     67     if (fPtr) {
     68         fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
     69     }
     70 }
     71 
     72 AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
     73                                        int minLength)
     74 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     75     SkASSERT(env);
     76     if (array) {
     77         fLen = env->GetArrayLength(array);
     78         if (fLen < minLength) {
     79             sk_throw();
     80         }
     81         fPtr = env->GetIntArrayElements(array, NULL);
     82     }
     83 }
     84 
     85 AutoJavaIntArray::~AutoJavaIntArray() {
     86     if (fPtr) {
     87         fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
     88     }
     89 }
     90 
     91 AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
     92                                        int minLength, JNIAccess access)
     93 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     94     SkASSERT(env);
     95     if (array) {
     96         fLen = env->GetArrayLength(array);
     97         if (fLen < minLength) {
     98             sk_throw();
     99         }
    100         fPtr = env->GetShortArrayElements(array, NULL);
    101     }
    102     fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
    103 }
    104 
    105 AutoJavaShortArray::~AutoJavaShortArray() {
    106     if (fPtr) {
    107         fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
    108     }
    109 }
    110 
    111 AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
    112                                        int minLength)
    113 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
    114     SkASSERT(env);
    115     if (array) {
    116         fLen = env->GetArrayLength(array);
    117         if (fLen < minLength) {
    118             sk_throw();
    119         }
    120         fPtr = env->GetByteArrayElements(array, NULL);
    121     }
    122 }
    123 
    124 AutoJavaByteArray::~AutoJavaByteArray() {
    125     if (fPtr) {
    126         fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
    127     }
    128 }
    129 
    130 ///////////////////////////////////////////////////////////////////////////////
    131 
    132 static jclass   gRect_class;
    133 static jfieldID gRect_leftFieldID;
    134 static jfieldID gRect_topFieldID;
    135 static jfieldID gRect_rightFieldID;
    136 static jfieldID gRect_bottomFieldID;
    137 
    138 static jclass   gRectF_class;
    139 static jfieldID gRectF_leftFieldID;
    140 static jfieldID gRectF_topFieldID;
    141 static jfieldID gRectF_rightFieldID;
    142 static jfieldID gRectF_bottomFieldID;
    143 
    144 static jclass   gPoint_class;
    145 static jfieldID gPoint_xFieldID;
    146 static jfieldID gPoint_yFieldID;
    147 
    148 static jclass   gPointF_class;
    149 static jfieldID gPointF_xFieldID;
    150 static jfieldID gPointF_yFieldID;
    151 
    152 static jclass   gBitmap_class;
    153 static jfieldID gBitmap_nativeInstanceID;
    154 static jmethodID gBitmap_constructorMethodID;
    155 static jmethodID gBitmap_reinitMethodID;
    156 static jmethodID gBitmap_getAllocationByteCountMethodID;
    157 
    158 static jclass   gBitmapConfig_class;
    159 static jfieldID gBitmapConfig_nativeInstanceID;
    160 
    161 static jclass   gBitmapRegionDecoder_class;
    162 static jmethodID gBitmapRegionDecoder_constructorMethodID;
    163 
    164 static jclass   gCanvas_class;
    165 static jfieldID gCanvas_nativeInstanceID;
    166 
    167 static jclass   gPaint_class;
    168 static jfieldID gPaint_nativeInstanceID;
    169 
    170 static jclass   gPicture_class;
    171 static jfieldID gPicture_nativeInstanceID;
    172 
    173 static jclass   gRegion_class;
    174 static jfieldID gRegion_nativeInstanceID;
    175 static jmethodID gRegion_constructorMethodID;
    176 
    177 ///////////////////////////////////////////////////////////////////////////////
    178 
    179 void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
    180 {
    181     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    182 
    183     *L = env->GetIntField(obj, gRect_leftFieldID);
    184     *T = env->GetIntField(obj, gRect_topFieldID);
    185     *R = env->GetIntField(obj, gRect_rightFieldID);
    186     *B = env->GetIntField(obj, gRect_bottomFieldID);
    187 }
    188 
    189 void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
    190 {
    191     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    192 
    193     env->SetIntField(obj, gRect_leftFieldID, L);
    194     env->SetIntField(obj, gRect_topFieldID, T);
    195     env->SetIntField(obj, gRect_rightFieldID, R);
    196     env->SetIntField(obj, gRect_bottomFieldID, B);
    197 }
    198 
    199 SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
    200 {
    201     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    202 
    203     ir->set(env->GetIntField(obj, gRect_leftFieldID),
    204             env->GetIntField(obj, gRect_topFieldID),
    205             env->GetIntField(obj, gRect_rightFieldID),
    206             env->GetIntField(obj, gRect_bottomFieldID));
    207     return ir;
    208 }
    209 
    210 void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
    211 {
    212     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    213 
    214     env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
    215     env->SetIntField(obj, gRect_topFieldID, ir.fTop);
    216     env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
    217     env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
    218 }
    219 
    220 SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
    221 {
    222     SkASSERT(env->IsInstanceOf(obj, gRectF_class));
    223 
    224     r->set(SkFloatToScalar(env->GetFloatField(obj, gRectF_leftFieldID)),
    225            SkFloatToScalar(env->GetFloatField(obj, gRectF_topFieldID)),
    226            SkFloatToScalar(env->GetFloatField(obj, gRectF_rightFieldID)),
    227            SkFloatToScalar(env->GetFloatField(obj, gRectF_bottomFieldID)));
    228     return r;
    229 }
    230 
    231 SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
    232 {
    233     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    234 
    235     r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
    236            SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
    237            SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
    238            SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
    239     return r;
    240 }
    241 
    242 void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
    243 {
    244     SkASSERT(env->IsInstanceOf(obj, gRectF_class));
    245 
    246     env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
    247     env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
    248     env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
    249     env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
    250 }
    251 
    252 SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
    253 {
    254     SkASSERT(env->IsInstanceOf(obj, gPoint_class));
    255 
    256     point->set(env->GetIntField(obj, gPoint_xFieldID),
    257                env->GetIntField(obj, gPoint_yFieldID));
    258     return point;
    259 }
    260 
    261 void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
    262 {
    263     SkASSERT(env->IsInstanceOf(obj, gPoint_class));
    264 
    265     env->SetIntField(obj, gPoint_xFieldID, ir.fX);
    266     env->SetIntField(obj, gPoint_yFieldID, ir.fY);
    267 }
    268 
    269 SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
    270 {
    271     SkASSERT(env->IsInstanceOf(obj, gPointF_class));
    272 
    273     point->set(SkFloatToScalar(env->GetIntField(obj, gPointF_xFieldID)),
    274                SkFloatToScalar(env->GetIntField(obj, gPointF_yFieldID)));
    275     return point;
    276 }
    277 
    278 void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
    279 {
    280     SkASSERT(env->IsInstanceOf(obj, gPointF_class));
    281 
    282     env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
    283     env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
    284 }
    285 
    286 SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
    287     SkASSERT(env);
    288     SkASSERT(bitmap);
    289     SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
    290     SkBitmap* b = (SkBitmap*)env->GetIntField(bitmap, gBitmap_nativeInstanceID);
    291     SkASSERT(b);
    292     return b;
    293 }
    294 
    295 SkBitmap::Config GraphicsJNI::getNativeBitmapConfig(JNIEnv* env,
    296                                                     jobject jconfig) {
    297     SkASSERT(env);
    298     if (NULL == jconfig) {
    299         return SkBitmap::kNo_Config;
    300     }
    301     SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
    302     int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
    303     if (c < 0 || c >= SkBitmap::kConfigCount) {
    304         c = SkBitmap::kNo_Config;
    305     }
    306     return static_cast<SkBitmap::Config>(c);
    307 }
    308 
    309 SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
    310     SkASSERT(env);
    311     SkASSERT(canvas);
    312     SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
    313     SkCanvas* c = (SkCanvas*)env->GetIntField(canvas, gCanvas_nativeInstanceID);
    314     SkASSERT(c);
    315     return c;
    316 }
    317 
    318 SkPaint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
    319     SkASSERT(env);
    320     SkASSERT(paint);
    321     SkASSERT(env->IsInstanceOf(paint, gPaint_class));
    322     SkPaint* p = (SkPaint*)env->GetIntField(paint, gPaint_nativeInstanceID);
    323     SkASSERT(p);
    324     return p;
    325 }
    326 
    327 SkPicture* GraphicsJNI::getNativePicture(JNIEnv* env, jobject picture)
    328 {
    329     SkASSERT(env);
    330     SkASSERT(picture);
    331     SkASSERT(env->IsInstanceOf(picture, gPicture_class));
    332     SkPicture* p = (SkPicture*)env->GetIntField(picture, gPicture_nativeInstanceID);
    333     SkASSERT(p);
    334     return p;
    335 }
    336 
    337 SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
    338 {
    339     SkASSERT(env);
    340     SkASSERT(region);
    341     SkASSERT(env->IsInstanceOf(region, gRegion_class));
    342     SkRegion* r = (SkRegion*)env->GetIntField(region, gRegion_nativeInstanceID);
    343     SkASSERT(r);
    344     return r;
    345 }
    346 
    347 ///////////////////////////////////////////////////////////////////////////////////////////
    348 
    349 jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
    350         int bitmapCreateFlags, jbyteArray ninepatch, jintArray layoutbounds, int density)
    351 {
    352     SkASSERT(bitmap);
    353     SkASSERT(bitmap->pixelRef());
    354     bool isMutable = bitmapCreateFlags & kBitmapCreateFlag_Mutable;
    355     bool isPremultiplied = bitmapCreateFlags & kBitmapCreateFlag_Premultiplied;
    356 
    357     jobject obj = env->NewObject(gBitmap_class, gBitmap_constructorMethodID,
    358             static_cast<jint>(reinterpret_cast<uintptr_t>(bitmap)), buffer,
    359             bitmap->width(), bitmap->height(), density, isMutable, isPremultiplied,
    360             ninepatch, layoutbounds);
    361     hasException(env); // For the side effect of logging.
    362     return obj;
    363 }
    364 
    365 jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, int bitmapCreateFlags,
    366         jbyteArray ninepatch, int density)
    367 {
    368     return createBitmap(env, bitmap, NULL, bitmapCreateFlags, ninepatch, NULL, density);
    369 }
    370 
    371 void GraphicsJNI::reinitBitmap(JNIEnv* env, jobject javaBitmap, SkBitmap* bitmap,
    372         bool isPremultiplied)
    373 {
    374     env->CallVoidMethod(javaBitmap, gBitmap_reinitMethodID,
    375             bitmap->width(), bitmap->height(), isPremultiplied);
    376 }
    377 
    378 int GraphicsJNI::getBitmapAllocationByteCount(JNIEnv* env, jobject javaBitmap)
    379 {
    380     return env->CallIntMethod(javaBitmap, gBitmap_getAllocationByteCountMethodID);
    381 }
    382 
    383 jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
    384 {
    385     SkASSERT(bitmap != NULL);
    386 
    387     jobject obj = env->NewObject(gBitmapRegionDecoder_class,
    388             gBitmapRegionDecoder_constructorMethodID,
    389             static_cast<jint>(reinterpret_cast<uintptr_t>(bitmap)));
    390     hasException(env); // For the side effect of logging.
    391     return obj;
    392 }
    393 
    394 jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
    395 {
    396     SkASSERT(region != NULL);
    397     jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
    398             static_cast<jint>(reinterpret_cast<uintptr_t>(region)), 0);
    399     hasException(env); // For the side effect of logging.
    400     return obj;
    401 }
    402 
    403 static JNIEnv* vm2env(JavaVM* vm)
    404 {
    405     JNIEnv* env = NULL;
    406     if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
    407     {
    408         SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
    409         sk_throw();
    410     }
    411     return env;
    412 }
    413 
    414 ///////////////////////////////////////////////////////////////////////////////
    415 
    416 AndroidPixelRef::AndroidPixelRef(JNIEnv* env, void* storage, size_t size, jbyteArray storageObj,
    417         SkColorTable* ctable) : SkMallocPixelRef(storage, size, ctable, (storageObj == NULL)),
    418         fWrappedPixelRef(NULL) {
    419     SkASSERT(storage);
    420     SkASSERT(env);
    421 
    422     if (env->GetJavaVM(&fVM) != JNI_OK) {
    423         SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
    424         sk_throw();
    425     }
    426     fStorageObj = storageObj;
    427     fHasGlobalRef = false;
    428     fGlobalRefCnt = 0;
    429 
    430     // If storageObj is NULL, the memory was NOT allocated on the Java heap
    431     fOnJavaHeap = (storageObj != NULL);
    432 
    433 }
    434 
    435 AndroidPixelRef::AndroidPixelRef(AndroidPixelRef& wrappedPixelRef, SkColorTable* ctable) :
    436         SkMallocPixelRef(wrappedPixelRef.getAddr(), wrappedPixelRef.getSize(), ctable, false),
    437         fWrappedPixelRef(wrappedPixelRef.fWrappedPixelRef ?
    438             wrappedPixelRef.fWrappedPixelRef : &wrappedPixelRef)
    439 {
    440     SkASSERT(fWrappedPixelRef);
    441     SkSafeRef(fWrappedPixelRef);
    442 
    443     // don't need to initialize these, as all the relevant logic delegates to the wrapped ref
    444     fStorageObj = NULL;
    445     fHasGlobalRef = false;
    446     fGlobalRefCnt = 0;
    447     fOnJavaHeap = false;
    448 }
    449 
    450 AndroidPixelRef::~AndroidPixelRef() {
    451     if (fWrappedPixelRef) {
    452         SkSafeUnref(fWrappedPixelRef);
    453     } else if (fOnJavaHeap) {
    454         JNIEnv* env = vm2env(fVM);
    455 
    456         if (fStorageObj && fHasGlobalRef) {
    457             env->DeleteGlobalRef(fStorageObj);
    458         }
    459         fStorageObj = NULL;
    460     }
    461 }
    462 jbyteArray AndroidPixelRef::getStorageObj() {
    463     if (fWrappedPixelRef) {
    464         return fWrappedPixelRef->fStorageObj;
    465     }
    466     return fStorageObj;
    467 }
    468 
    469 void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
    470     if (fWrappedPixelRef) {
    471         // delegate java obj management to the wrapped ref
    472         fWrappedPixelRef->setLocalJNIRef(arr);
    473     } else if (!fHasGlobalRef) {
    474         fStorageObj = arr;
    475     }
    476 }
    477 
    478 void AndroidPixelRef::globalRef(void* localref) {
    479     if (fWrappedPixelRef) {
    480         // delegate java obj management to the wrapped ref
    481         fWrappedPixelRef->globalRef(localref);
    482 
    483         // Note: we only ref and unref the wrapped AndroidPixelRef so that
    484         // bitmap->pixelRef()->globalRef() and globalUnref() can be used in a pair, even if
    485         // the bitmap has its underlying AndroidPixelRef swapped out/wrapped
    486         return;
    487     }
    488     if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
    489         JNIEnv *env = vm2env(fVM);
    490 
    491         // If JNI ref was passed, it is always used
    492         if (localref) fStorageObj = (jbyteArray) localref;
    493 
    494         if (fStorageObj == NULL) {
    495             SkDebugf("No valid local ref to create a JNI global ref\n");
    496             sk_throw();
    497         }
    498         if (fHasGlobalRef) {
    499             // This should never happen
    500             SkDebugf("Already holding a JNI global ref");
    501             sk_throw();
    502         }
    503 
    504         fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
    505         // TODO: Check for failure here
    506         fHasGlobalRef = true;
    507     }
    508     ref();
    509 }
    510 
    511 void AndroidPixelRef::globalUnref() {
    512     if (fWrappedPixelRef) {
    513         // delegate java obj management to the wrapped ref
    514         fWrappedPixelRef->globalUnref();
    515         return;
    516     }
    517     if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
    518         JNIEnv *env = vm2env(fVM);
    519         if (!fHasGlobalRef) {
    520             SkDebugf("We don't have a global ref!");
    521             sk_throw();
    522         }
    523         env->DeleteGlobalRef(fStorageObj);
    524         fStorageObj = NULL;
    525         fHasGlobalRef = false;
    526     }
    527     unref();
    528 }
    529 
    530 ///////////////////////////////////////////////////////////////////////////////
    531 
    532 extern "C" jbyte* jniGetNonMovableArrayElements(C_JNIEnv* env, jarray arrayObj);
    533 
    534 jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
    535                                              SkColorTable* ctable) {
    536     Sk64 size64 = bitmap->getSize64();
    537     if (size64.isNeg() || !size64.is32()) {
    538         jniThrowException(env, "java/lang/IllegalArgumentException",
    539                           "bitmap size exceeds 32bits");
    540         return NULL;
    541     }
    542 
    543     size_t size = size64.get32();
    544     jbyteArray arrayObj = env->NewByteArray(size);
    545     if (arrayObj) {
    546         // TODO: make this work without jniGetNonMovableArrayElements
    547         jbyte* addr = jniGetNonMovableArrayElements(&env->functions, arrayObj);
    548         if (addr) {
    549             SkPixelRef* pr = new AndroidPixelRef(env, (void*) addr, size, arrayObj, ctable);
    550             bitmap->setPixelRef(pr)->unref();
    551             // since we're already allocated, we lockPixels right away
    552             // HeapAllocator behaves this way too
    553             bitmap->lockPixels();
    554         }
    555     }
    556 
    557     return arrayObj;
    558 }
    559 
    560 ///////////////////////////////////////////////////////////////////////////////
    561 
    562 JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
    563     : fStorageObj(NULL),
    564       fAllocCount(0) {
    565     if (env->GetJavaVM(&fVM) != JNI_OK) {
    566         SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
    567         sk_throw();
    568     }
    569 }
    570 
    571 bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
    572     JNIEnv* env = vm2env(fVM);
    573 
    574     fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
    575     fAllocCount += 1;
    576     return fStorageObj != NULL;
    577 }
    578 
    579 ////////////////////////////////////////////////////////////////////////////////
    580 
    581 JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
    582     fEnv = env;
    583     fNativeBitmap = nativeBitmap;
    584     fBuffer = buffer;
    585 
    586     // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
    587     if (fBuffer) {
    588         ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
    589     }
    590 }
    591 
    592 JavaHeapBitmapRef::~JavaHeapBitmapRef() {
    593     if (fBuffer) {
    594         ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
    595     }
    596 }
    597 
    598 ////////////////////////////////////////////////////////////////////////////////
    599 
    600 static jclass make_globalref(JNIEnv* env, const char classname[])
    601 {
    602     jclass c = env->FindClass(classname);
    603     SkASSERT(c);
    604     return (jclass)env->NewGlobalRef(c);
    605 }
    606 
    607 static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
    608                                 const char fieldname[], const char type[])
    609 {
    610     jfieldID id = env->GetFieldID(clazz, fieldname, type);
    611     SkASSERT(id);
    612     return id;
    613 }
    614 
    615 int register_android_graphics_Graphics(JNIEnv* env)
    616 {
    617     jmethodID m;
    618     jclass c;
    619 
    620     gRect_class = make_globalref(env, "android/graphics/Rect");
    621     gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
    622     gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
    623     gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
    624     gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
    625 
    626     gRectF_class = make_globalref(env, "android/graphics/RectF");
    627     gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
    628     gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
    629     gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
    630     gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
    631 
    632     gPoint_class = make_globalref(env, "android/graphics/Point");
    633     gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
    634     gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
    635 
    636     gPointF_class = make_globalref(env, "android/graphics/PointF");
    637     gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
    638     gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
    639 
    640     gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
    641     gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "I");
    642     gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>", "(I[BIIIZZ[B[I)V");
    643     gBitmap_reinitMethodID = env->GetMethodID(gBitmap_class, "reinit", "(IIZ)V");
    644     gBitmap_getAllocationByteCountMethodID = env->GetMethodID(gBitmap_class, "getAllocationByteCount", "()I");
    645     gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
    646     gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(I)V");
    647 
    648     gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
    649     gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
    650                                                      "nativeInt", "I");
    651 
    652     gCanvas_class = make_globalref(env, "android/graphics/Canvas");
    653     gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvas", "I");
    654 
    655     gPaint_class = make_globalref(env, "android/graphics/Paint");
    656     gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "I");
    657 
    658     gPicture_class = make_globalref(env, "android/graphics/Picture");
    659     gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "I");
    660 
    661     gRegion_class = make_globalref(env, "android/graphics/Region");
    662     gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "I");
    663     gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
    664         "(II)V");
    665 
    666     return 0;
    667 }
    668