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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 "Canvas.h"
      8 #include "SkCanvas.h"
      9 #include "SkDevice.h"
     10 #include "SkMath.h"
     11 #include "SkPicture.h"
     12 #include "SkRegion.h"
     13 #include <android_runtime/AndroidRuntime.h>
     14 
     15 void doThrowNPE(JNIEnv* env) {
     16     jniThrowNullPointerException(env, NULL);
     17 }
     18 
     19 void doThrowAIOOBE(JNIEnv* env) {
     20     jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
     21 }
     22 
     23 void doThrowRE(JNIEnv* env, const char* msg) {
     24     jniThrowRuntimeException(env, msg);
     25 }
     26 
     27 void doThrowIAE(JNIEnv* env, const char* msg) {
     28     jniThrowException(env, "java/lang/IllegalArgumentException", msg);
     29 }
     30 
     31 void doThrowISE(JNIEnv* env, const char* msg) {
     32     jniThrowException(env, "java/lang/IllegalStateException", msg);
     33 }
     34 
     35 void doThrowOOME(JNIEnv* env, const char* msg) {
     36     jniThrowException(env, "java/lang/OutOfMemoryError", msg);
     37 }
     38 
     39 void doThrowIOE(JNIEnv* env, const char* msg) {
     40     jniThrowException(env, "java/io/IOException", msg);
     41 }
     42 
     43 bool GraphicsJNI::hasException(JNIEnv *env) {
     44     if (env->ExceptionCheck() != 0) {
     45         ALOGE("*** Uncaught exception returned from Java call!\n");
     46         env->ExceptionDescribe();
     47         return true;
     48     }
     49     return false;
     50 }
     51 
     52 ///////////////////////////////////////////////////////////////////////////////
     53 
     54 AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
     55                                        int minLength, JNIAccess access)
     56 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     57     SkASSERT(env);
     58     if (array) {
     59         fLen = env->GetArrayLength(array);
     60         if (fLen < minLength) {
     61             sk_throw();
     62         }
     63         fPtr = env->GetFloatArrayElements(array, NULL);
     64     }
     65     fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
     66 }
     67 
     68 AutoJavaFloatArray::~AutoJavaFloatArray() {
     69     if (fPtr) {
     70         fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
     71     }
     72 }
     73 
     74 AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
     75                                        int minLength)
     76 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     77     SkASSERT(env);
     78     if (array) {
     79         fLen = env->GetArrayLength(array);
     80         if (fLen < minLength) {
     81             sk_throw();
     82         }
     83         fPtr = env->GetIntArrayElements(array, NULL);
     84     }
     85 }
     86 
     87 AutoJavaIntArray::~AutoJavaIntArray() {
     88     if (fPtr) {
     89         fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
     90     }
     91 }
     92 
     93 AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
     94                                        int minLength, JNIAccess access)
     95 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     96     SkASSERT(env);
     97     if (array) {
     98         fLen = env->GetArrayLength(array);
     99         if (fLen < minLength) {
    100             sk_throw();
    101         }
    102         fPtr = env->GetShortArrayElements(array, NULL);
    103     }
    104     fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
    105 }
    106 
    107 AutoJavaShortArray::~AutoJavaShortArray() {
    108     if (fPtr) {
    109         fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
    110     }
    111 }
    112 
    113 AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
    114                                        int minLength)
    115 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
    116     SkASSERT(env);
    117     if (array) {
    118         fLen = env->GetArrayLength(array);
    119         if (fLen < minLength) {
    120             sk_throw();
    121         }
    122         fPtr = env->GetByteArrayElements(array, NULL);
    123     }
    124 }
    125 
    126 AutoJavaByteArray::~AutoJavaByteArray() {
    127     if (fPtr) {
    128         fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
    129     }
    130 }
    131 
    132 ///////////////////////////////////////////////////////////////////////////////
    133 
    134 static jclass   gRect_class;
    135 static jfieldID gRect_leftFieldID;
    136 static jfieldID gRect_topFieldID;
    137 static jfieldID gRect_rightFieldID;
    138 static jfieldID gRect_bottomFieldID;
    139 
    140 static jclass   gRectF_class;
    141 static jfieldID gRectF_leftFieldID;
    142 static jfieldID gRectF_topFieldID;
    143 static jfieldID gRectF_rightFieldID;
    144 static jfieldID gRectF_bottomFieldID;
    145 
    146 static jclass   gPoint_class;
    147 static jfieldID gPoint_xFieldID;
    148 static jfieldID gPoint_yFieldID;
    149 
    150 static jclass   gPointF_class;
    151 static jfieldID gPointF_xFieldID;
    152 static jfieldID gPointF_yFieldID;
    153 
    154 static jclass   gBitmap_class;
    155 static jfieldID gBitmap_nativeInstanceID;
    156 static jmethodID gBitmap_constructorMethodID;
    157 static jmethodID gBitmap_reinitMethodID;
    158 static jmethodID gBitmap_getAllocationByteCountMethodID;
    159 
    160 static jclass   gBitmapConfig_class;
    161 static jfieldID gBitmapConfig_nativeInstanceID;
    162 
    163 static jclass   gBitmapRegionDecoder_class;
    164 static jmethodID gBitmapRegionDecoder_constructorMethodID;
    165 
    166 static jclass   gCanvas_class;
    167 static jfieldID gCanvas_nativeInstanceID;
    168 
    169 static jclass   gPaint_class;
    170 static jfieldID gPaint_nativeInstanceID;
    171 static jfieldID gPaint_nativeTypefaceID;
    172 
    173 static jclass   gPicture_class;
    174 static jfieldID gPicture_nativeInstanceID;
    175 
    176 static jclass   gRegion_class;
    177 static jfieldID gRegion_nativeInstanceID;
    178 static jmethodID gRegion_constructorMethodID;
    179 
    180 static jclass    gByte_class;
    181 static jobject   gVMRuntime;
    182 static jclass    gVMRuntime_class;
    183 static jmethodID gVMRuntime_newNonMovableArray;
    184 static jmethodID gVMRuntime_addressOf;
    185 
    186 ///////////////////////////////////////////////////////////////////////////////
    187 
    188 void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
    189 {
    190     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    191 
    192     *L = env->GetIntField(obj, gRect_leftFieldID);
    193     *T = env->GetIntField(obj, gRect_topFieldID);
    194     *R = env->GetIntField(obj, gRect_rightFieldID);
    195     *B = env->GetIntField(obj, gRect_bottomFieldID);
    196 }
    197 
    198 void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
    199 {
    200     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    201 
    202     env->SetIntField(obj, gRect_leftFieldID, L);
    203     env->SetIntField(obj, gRect_topFieldID, T);
    204     env->SetIntField(obj, gRect_rightFieldID, R);
    205     env->SetIntField(obj, gRect_bottomFieldID, B);
    206 }
    207 
    208 SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
    209 {
    210     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    211 
    212     ir->set(env->GetIntField(obj, gRect_leftFieldID),
    213             env->GetIntField(obj, gRect_topFieldID),
    214             env->GetIntField(obj, gRect_rightFieldID),
    215             env->GetIntField(obj, gRect_bottomFieldID));
    216     return ir;
    217 }
    218 
    219 void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
    220 {
    221     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    222 
    223     env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
    224     env->SetIntField(obj, gRect_topFieldID, ir.fTop);
    225     env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
    226     env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
    227 }
    228 
    229 SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
    230 {
    231     SkASSERT(env->IsInstanceOf(obj, gRectF_class));
    232 
    233     r->set(env->GetFloatField(obj, gRectF_leftFieldID),
    234            env->GetFloatField(obj, gRectF_topFieldID),
    235            env->GetFloatField(obj, gRectF_rightFieldID),
    236            env->GetFloatField(obj, gRectF_bottomFieldID));
    237     return r;
    238 }
    239 
    240 SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
    241 {
    242     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    243 
    244     r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
    245            SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
    246            SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
    247            SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
    248     return r;
    249 }
    250 
    251 void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
    252 {
    253     SkASSERT(env->IsInstanceOf(obj, gRectF_class));
    254 
    255     env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
    256     env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
    257     env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
    258     env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
    259 }
    260 
    261 SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
    262 {
    263     SkASSERT(env->IsInstanceOf(obj, gPoint_class));
    264 
    265     point->set(env->GetIntField(obj, gPoint_xFieldID),
    266                env->GetIntField(obj, gPoint_yFieldID));
    267     return point;
    268 }
    269 
    270 void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
    271 {
    272     SkASSERT(env->IsInstanceOf(obj, gPoint_class));
    273 
    274     env->SetIntField(obj, gPoint_xFieldID, ir.fX);
    275     env->SetIntField(obj, gPoint_yFieldID, ir.fY);
    276 }
    277 
    278 SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
    279 {
    280     SkASSERT(env->IsInstanceOf(obj, gPointF_class));
    281 
    282     point->set(env->GetIntField(obj, gPointF_xFieldID),
    283                env->GetIntField(obj, gPointF_yFieldID));
    284     return point;
    285 }
    286 
    287 void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
    288 {
    289     SkASSERT(env->IsInstanceOf(obj, gPointF_class));
    290 
    291     env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
    292     env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
    293 }
    294 
    295 // This enum must keep these int values, to match the int values
    296 // in the java Bitmap.Config enum.
    297 enum LegacyBitmapConfig {
    298     kNo_LegacyBitmapConfig          = 0,
    299     kA8_LegacyBitmapConfig          = 1,
    300     kIndex8_LegacyBitmapConfig      = 2,
    301     kRGB_565_LegacyBitmapConfig     = 3,
    302     kARGB_4444_LegacyBitmapConfig   = 4,
    303     kARGB_8888_LegacyBitmapConfig   = 5,
    304 
    305     kLastEnum_LegacyBitmapConfig = kARGB_8888_LegacyBitmapConfig
    306 };
    307 
    308 jint GraphicsJNI::colorTypeToLegacyBitmapConfig(SkColorType colorType) {
    309     switch (colorType) {
    310         case kN32_SkColorType:
    311             return kARGB_8888_LegacyBitmapConfig;
    312         case kARGB_4444_SkColorType:
    313             return kARGB_4444_LegacyBitmapConfig;
    314         case kRGB_565_SkColorType:
    315             return kRGB_565_LegacyBitmapConfig;
    316         case kIndex_8_SkColorType:
    317             return kIndex8_LegacyBitmapConfig;
    318         case kAlpha_8_SkColorType:
    319             return kA8_LegacyBitmapConfig;
    320         case kUnknown_SkColorType:
    321         default:
    322             break;
    323     }
    324     return kNo_LegacyBitmapConfig;
    325 }
    326 
    327 SkColorType GraphicsJNI::legacyBitmapConfigToColorType(jint legacyConfig) {
    328     const uint8_t gConfig2ColorType[] = {
    329         kUnknown_SkColorType,
    330         kAlpha_8_SkColorType,
    331         kIndex_8_SkColorType,
    332         kRGB_565_SkColorType,
    333         kARGB_4444_SkColorType,
    334         kN32_SkColorType
    335     };
    336 
    337     if (legacyConfig < 0 || legacyConfig > kLastEnum_LegacyBitmapConfig) {
    338         legacyConfig = kNo_LegacyBitmapConfig;
    339     }
    340     return static_cast<SkColorType>(gConfig2ColorType[legacyConfig]);
    341 }
    342 
    343 SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
    344     SkASSERT(env);
    345     SkASSERT(bitmap);
    346     SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
    347     jlong bitmapHandle = env->GetLongField(bitmap, gBitmap_nativeInstanceID);
    348     SkBitmap* b = reinterpret_cast<SkBitmap*>(bitmapHandle);
    349     SkASSERT(b);
    350     return b;
    351 }
    352 
    353 SkColorType GraphicsJNI::getNativeBitmapColorType(JNIEnv* env, jobject jconfig) {
    354     SkASSERT(env);
    355     if (NULL == jconfig) {
    356         return kUnknown_SkColorType;
    357     }
    358     SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
    359     int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
    360     return legacyBitmapConfigToColorType(c);
    361 }
    362 
    363 SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
    364     SkASSERT(env);
    365     SkASSERT(canvas);
    366     SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
    367     jlong canvasHandle = env->GetLongField(canvas, gCanvas_nativeInstanceID);
    368     SkCanvas* c = reinterpret_cast<android::Canvas*>(canvasHandle)->getSkCanvas();
    369     SkASSERT(c);
    370     return c;
    371 }
    372 
    373 android::Paint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
    374     SkASSERT(env);
    375     SkASSERT(paint);
    376     SkASSERT(env->IsInstanceOf(paint, gPaint_class));
    377     jlong paintHandle = env->GetLongField(paint, gPaint_nativeInstanceID);
    378     android::Paint* p = reinterpret_cast<android::Paint*>(paintHandle);
    379     SkASSERT(p);
    380     return p;
    381 }
    382 
    383 android::TypefaceImpl* GraphicsJNI::getNativeTypeface(JNIEnv* env, jobject paint) {
    384     SkASSERT(env);
    385     SkASSERT(paint);
    386     SkASSERT(env->IsInstanceOf(paint, gPaint_class));
    387     jlong typefaceHandle = env->GetLongField(paint, gPaint_nativeTypefaceID);
    388     android::TypefaceImpl* p = reinterpret_cast<android::TypefaceImpl*>(typefaceHandle);
    389     return p;
    390 }
    391 
    392 SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
    393 {
    394     SkASSERT(env);
    395     SkASSERT(region);
    396     SkASSERT(env->IsInstanceOf(region, gRegion_class));
    397     jlong regionHandle = env->GetLongField(region, gRegion_nativeInstanceID);
    398     SkRegion* r = reinterpret_cast<SkRegion*>(regionHandle);
    399     SkASSERT(r);
    400     return r;
    401 }
    402 
    403 ///////////////////////////////////////////////////////////////////////////////////////////
    404 
    405 // Assert that bitmap's SkAlphaType is consistent with isPremultiplied.
    406 static void assert_premultiplied(const SkBitmap& bitmap, bool isPremultiplied) {
    407     // kOpaque_SkAlphaType and kIgnore_SkAlphaType mean that isPremultiplied is
    408     // irrelevant. This just tests to ensure that the SkAlphaType is not
    409     // opposite of isPremultiplied.
    410     if (isPremultiplied) {
    411         SkASSERT(bitmap.alphaType() != kUnpremul_SkAlphaType);
    412     } else {
    413         SkASSERT(bitmap.alphaType() != kPremul_SkAlphaType);
    414     }
    415 }
    416 
    417 jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
    418         int bitmapCreateFlags, jbyteArray ninePatchChunk, jobject ninePatchInsets, int density)
    419 {
    420     SkASSERT(bitmap);
    421     SkASSERT(bitmap->pixelRef());
    422     SkASSERT(!env->ExceptionCheck());
    423     bool isMutable = bitmapCreateFlags & kBitmapCreateFlag_Mutable;
    424     bool isPremultiplied = bitmapCreateFlags & kBitmapCreateFlag_Premultiplied;
    425 
    426     // The caller needs to have already set the alpha type properly, so the
    427     // native SkBitmap stays in sync with the Java Bitmap.
    428     assert_premultiplied(*bitmap, isPremultiplied);
    429 
    430     jobject obj = env->NewObject(gBitmap_class, gBitmap_constructorMethodID,
    431             reinterpret_cast<jlong>(bitmap), buffer,
    432             bitmap->width(), bitmap->height(), density, isMutable, isPremultiplied,
    433             ninePatchChunk, ninePatchInsets);
    434     hasException(env); // For the side effect of logging.
    435     return obj;
    436 }
    437 
    438 void GraphicsJNI::reinitBitmap(JNIEnv* env, jobject javaBitmap, SkBitmap* bitmap,
    439         bool isPremultiplied)
    440 {
    441     // The caller needs to have already set the alpha type properly, so the
    442     // native SkBitmap stays in sync with the Java Bitmap.
    443     assert_premultiplied(*bitmap, isPremultiplied);
    444 
    445     env->CallVoidMethod(javaBitmap, gBitmap_reinitMethodID,
    446             bitmap->width(), bitmap->height(), isPremultiplied);
    447 }
    448 
    449 int GraphicsJNI::getBitmapAllocationByteCount(JNIEnv* env, jobject javaBitmap)
    450 {
    451     return env->CallIntMethod(javaBitmap, gBitmap_getAllocationByteCountMethodID);
    452 }
    453 
    454 jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
    455 {
    456     SkASSERT(bitmap != NULL);
    457 
    458     jobject obj = env->NewObject(gBitmapRegionDecoder_class,
    459             gBitmapRegionDecoder_constructorMethodID,
    460             reinterpret_cast<jlong>(bitmap));
    461     hasException(env); // For the side effect of logging.
    462     return obj;
    463 }
    464 
    465 jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
    466 {
    467     SkASSERT(region != NULL);
    468     jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
    469                                  reinterpret_cast<jlong>(region), 0);
    470     hasException(env); // For the side effect of logging.
    471     return obj;
    472 }
    473 
    474 static JNIEnv* vm2env(JavaVM* vm)
    475 {
    476     JNIEnv* env = NULL;
    477     if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
    478     {
    479         SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
    480         sk_throw();
    481     }
    482     return env;
    483 }
    484 
    485 ///////////////////////////////////////////////////////////////////////////////
    486 
    487 AndroidPixelRef::AndroidPixelRef(JNIEnv* env, const SkImageInfo& info, void* storage,
    488         size_t rowBytes, jbyteArray storageObj, SkColorTable* ctable) :
    489         SkMallocPixelRef(info, storage, rowBytes, ctable, (storageObj == NULL)),
    490         fWrappedPixelRef(NULL) {
    491     SkASSERT(storage);
    492     SkASSERT(env);
    493 
    494     if (env->GetJavaVM(&fVM) != JNI_OK) {
    495         SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
    496         sk_throw();
    497     }
    498     fStorageObj = storageObj;
    499     fHasGlobalRef = false;
    500     fGlobalRefCnt = 0;
    501 
    502     // If storageObj is NULL, the memory was NOT allocated on the Java heap
    503     fOnJavaHeap = (storageObj != NULL);
    504 
    505 }
    506 
    507 AndroidPixelRef::AndroidPixelRef(AndroidPixelRef& wrappedPixelRef, const SkImageInfo& info,
    508         size_t rowBytes, SkColorTable* ctable) :
    509         SkMallocPixelRef(info, wrappedPixelRef.getAddr(), rowBytes, ctable, false),
    510         fWrappedPixelRef(wrappedPixelRef.fWrappedPixelRef ?
    511                 wrappedPixelRef.fWrappedPixelRef : &wrappedPixelRef)
    512 {
    513     SkASSERT(fWrappedPixelRef);
    514     SkSafeRef(fWrappedPixelRef);
    515 
    516     // don't need to initialize these, as all the relevant logic delegates to the wrapped ref
    517     fStorageObj = NULL;
    518     fHasGlobalRef = false;
    519     fGlobalRefCnt = 0;
    520     fOnJavaHeap = false;
    521 }
    522 
    523 AndroidPixelRef::~AndroidPixelRef() {
    524     if (fWrappedPixelRef) {
    525         SkSafeUnref(fWrappedPixelRef);
    526     } else if (fOnJavaHeap) {
    527         JNIEnv* env = vm2env(fVM);
    528 
    529         if (fStorageObj && fHasGlobalRef) {
    530             env->DeleteGlobalRef(fStorageObj);
    531         }
    532         fStorageObj = NULL;
    533     }
    534 }
    535 jbyteArray AndroidPixelRef::getStorageObj() {
    536     if (fWrappedPixelRef) {
    537         return fWrappedPixelRef->fStorageObj;
    538     }
    539     return fStorageObj;
    540 }
    541 
    542 void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
    543     if (fWrappedPixelRef) {
    544         // delegate java obj management to the wrapped ref
    545         fWrappedPixelRef->setLocalJNIRef(arr);
    546     } else if (!fHasGlobalRef) {
    547         fStorageObj = arr;
    548     }
    549 }
    550 
    551 void AndroidPixelRef::globalRef(void* localref) {
    552     if (fWrappedPixelRef) {
    553         // delegate java obj management to the wrapped ref
    554         fWrappedPixelRef->globalRef(localref);
    555 
    556         // Note: we only ref and unref the wrapped AndroidPixelRef so that
    557         // bitmap->pixelRef()->globalRef() and globalUnref() can be used in a pair, even if
    558         // the bitmap has its underlying AndroidPixelRef swapped out/wrapped
    559         return;
    560     }
    561     if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
    562         JNIEnv *env = vm2env(fVM);
    563 
    564         // If JNI ref was passed, it is always used
    565         if (localref) fStorageObj = (jbyteArray) localref;
    566 
    567         if (fStorageObj == NULL) {
    568             SkDebugf("No valid local ref to create a JNI global ref\n");
    569             sk_throw();
    570         }
    571         if (fHasGlobalRef) {
    572             // This should never happen
    573             SkDebugf("Already holding a JNI global ref");
    574             sk_throw();
    575         }
    576 
    577         fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
    578         // TODO: Check for failure here
    579         fHasGlobalRef = true;
    580     }
    581     ref();
    582 }
    583 
    584 void AndroidPixelRef::globalUnref() {
    585     if (fWrappedPixelRef) {
    586         // delegate java obj management to the wrapped ref
    587         fWrappedPixelRef->globalUnref();
    588         return;
    589     }
    590     if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
    591         JNIEnv *env = vm2env(fVM);
    592         if (!fHasGlobalRef) {
    593             SkDebugf("We don't have a global ref!");
    594             sk_throw();
    595         }
    596         env->DeleteGlobalRef(fStorageObj);
    597         fStorageObj = NULL;
    598         fHasGlobalRef = false;
    599     }
    600     unref();
    601 }
    602 
    603 ///////////////////////////////////////////////////////////////////////////////
    604 
    605 jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
    606                                              SkColorTable* ctable) {
    607     const SkImageInfo& info = bitmap->info();
    608     if (info.fColorType == kUnknown_SkColorType) {
    609         doThrowIAE(env, "unknown bitmap configuration");
    610         return NULL;
    611     }
    612 
    613     const size_t size = bitmap->getSize();
    614     jbyteArray arrayObj = (jbyteArray) env->CallObjectMethod(gVMRuntime,
    615                                                              gVMRuntime_newNonMovableArray,
    616                                                              gByte_class, size);
    617     if (env->ExceptionCheck() != 0) {
    618         return NULL;
    619     }
    620     SkASSERT(arrayObj);
    621     jbyte* addr = (jbyte*) env->CallLongMethod(gVMRuntime, gVMRuntime_addressOf, arrayObj);
    622     if (env->ExceptionCheck() != 0) {
    623         return NULL;
    624     }
    625     SkASSERT(addr);
    626     SkPixelRef* pr = new AndroidPixelRef(env, info, (void*) addr,
    627             bitmap->rowBytes(), arrayObj, ctable);
    628     bitmap->setPixelRef(pr)->unref();
    629     // since we're already allocated, we lockPixels right away
    630     // HeapAllocator behaves this way too
    631     bitmap->lockPixels();
    632 
    633     return arrayObj;
    634 }
    635 
    636 ///////////////////////////////////////////////////////////////////////////////
    637 
    638 JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
    639     : fStorageObj(NULL),
    640       fAllocCount(0) {
    641     if (env->GetJavaVM(&fVM) != JNI_OK) {
    642         SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
    643         sk_throw();
    644     }
    645 }
    646 
    647 bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
    648     JNIEnv* env = vm2env(fVM);
    649 
    650     fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
    651     fAllocCount += 1;
    652     return fStorageObj != NULL;
    653 }
    654 
    655 ////////////////////////////////////////////////////////////////////////////////
    656 
    657 JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
    658     fEnv = env;
    659     fNativeBitmap = nativeBitmap;
    660     fBuffer = buffer;
    661 
    662     // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
    663     if (fBuffer) {
    664         ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
    665     }
    666 }
    667 
    668 JavaHeapBitmapRef::~JavaHeapBitmapRef() {
    669     if (fBuffer) {
    670         ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
    671     }
    672 }
    673 
    674 ////////////////////////////////////////////////////////////////////////////////
    675 
    676 static jclass make_globalref(JNIEnv* env, const char classname[])
    677 {
    678     jclass c = env->FindClass(classname);
    679     SkASSERT(c);
    680     return (jclass) env->NewGlobalRef(c);
    681 }
    682 
    683 static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
    684                                 const char fieldname[], const char type[])
    685 {
    686     jfieldID id = env->GetFieldID(clazz, fieldname, type);
    687     SkASSERT(id);
    688     return id;
    689 }
    690 
    691 int register_android_graphics_Graphics(JNIEnv* env)
    692 {
    693     jmethodID m;
    694     jclass c;
    695 
    696     gRect_class = make_globalref(env, "android/graphics/Rect");
    697     gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
    698     gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
    699     gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
    700     gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
    701 
    702     gRectF_class = make_globalref(env, "android/graphics/RectF");
    703     gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
    704     gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
    705     gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
    706     gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
    707 
    708     gPoint_class = make_globalref(env, "android/graphics/Point");
    709     gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
    710     gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
    711 
    712     gPointF_class = make_globalref(env, "android/graphics/PointF");
    713     gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
    714     gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
    715 
    716     gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
    717     gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "J");
    718     gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>", "(J[BIIIZZ[BLandroid/graphics/NinePatch$InsetStruct;)V");
    719     gBitmap_reinitMethodID = env->GetMethodID(gBitmap_class, "reinit", "(IIZ)V");
    720     gBitmap_getAllocationByteCountMethodID = env->GetMethodID(gBitmap_class, "getAllocationByteCount", "()I");
    721     gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
    722     gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(J)V");
    723 
    724     gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
    725     gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
    726                                                      "nativeInt", "I");
    727 
    728     gCanvas_class = make_globalref(env, "android/graphics/Canvas");
    729     gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvasWrapper", "J");
    730 
    731     gPaint_class = make_globalref(env, "android/graphics/Paint");
    732     gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "J");
    733     gPaint_nativeTypefaceID = getFieldIDCheck(env, gPaint_class, "mNativeTypeface", "J");
    734 
    735     gPicture_class = make_globalref(env, "android/graphics/Picture");
    736     gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "J");
    737 
    738     gRegion_class = make_globalref(env, "android/graphics/Region");
    739     gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "J");
    740     gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
    741         "(JI)V");
    742 
    743     c = env->FindClass("java/lang/Byte");
    744     gByte_class = (jclass) env->NewGlobalRef(
    745         env->GetStaticObjectField(c, env->GetStaticFieldID(c, "TYPE", "Ljava/lang/Class;")));
    746 
    747     gVMRuntime_class = make_globalref(env, "dalvik/system/VMRuntime");
    748     m = env->GetStaticMethodID(gVMRuntime_class, "getRuntime", "()Ldalvik/system/VMRuntime;");
    749     gVMRuntime = env->NewGlobalRef(env->CallStaticObjectMethod(gVMRuntime_class, m));
    750     gVMRuntime_newNonMovableArray = env->GetMethodID(gVMRuntime_class, "newNonMovableArray",
    751                                                      "(Ljava/lang/Class;I)Ljava/lang/Object;");
    752     gVMRuntime_addressOf = env->GetMethodID(gVMRuntime_class, "addressOf", "(Ljava/lang/Object;)J");
    753 
    754     return 0;
    755 }
    756