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      1 #define LOG_TAG "GraphicsJNI"
      2 
      3 #include <unistd.h>
      4 #include <sys/mman.h>
      5 
      6 #include "jni.h"
      7 #include "JNIHelp.h"
      8 #include "GraphicsJNI.h"
      9 
     10 #include "SkCanvas.h"
     11 #include "SkDevice.h"
     12 #include "SkMath.h"
     13 #include "SkRegion.h"
     14 #include <android_runtime/AndroidRuntime.h>
     15 #include <cutils/ashmem.h>
     16 #include <hwui/Canvas.h>
     17 
     18 #include <Caches.h>
     19 #include <TextureCache.h>
     20 
     21 void doThrowNPE(JNIEnv* env) {
     22     jniThrowNullPointerException(env, NULL);
     23 }
     24 
     25 void doThrowAIOOBE(JNIEnv* env) {
     26     jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
     27 }
     28 
     29 void doThrowRE(JNIEnv* env, const char* msg) {
     30     jniThrowRuntimeException(env, msg);
     31 }
     32 
     33 void doThrowIAE(JNIEnv* env, const char* msg) {
     34     jniThrowException(env, "java/lang/IllegalArgumentException", msg);
     35 }
     36 
     37 void doThrowISE(JNIEnv* env, const char* msg) {
     38     jniThrowException(env, "java/lang/IllegalStateException", msg);
     39 }
     40 
     41 void doThrowOOME(JNIEnv* env, const char* msg) {
     42     jniThrowException(env, "java/lang/OutOfMemoryError", msg);
     43 }
     44 
     45 void doThrowIOE(JNIEnv* env, const char* msg) {
     46     jniThrowException(env, "java/io/IOException", msg);
     47 }
     48 
     49 bool GraphicsJNI::hasException(JNIEnv *env) {
     50     if (env->ExceptionCheck() != 0) {
     51         ALOGE("*** Uncaught exception returned from Java call!\n");
     52         env->ExceptionDescribe();
     53         return true;
     54     }
     55     return false;
     56 }
     57 
     58 ///////////////////////////////////////////////////////////////////////////////
     59 
     60 AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
     61                                        int minLength, JNIAccess access)
     62 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     63     SkASSERT(env);
     64     if (array) {
     65         fLen = env->GetArrayLength(array);
     66         if (fLen < minLength) {
     67             sk_throw();
     68         }
     69         fPtr = env->GetFloatArrayElements(array, NULL);
     70     }
     71     fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
     72 }
     73 
     74 AutoJavaFloatArray::~AutoJavaFloatArray() {
     75     if (fPtr) {
     76         fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
     77     }
     78 }
     79 
     80 AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
     81                                        int minLength)
     82 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
     83     SkASSERT(env);
     84     if (array) {
     85         fLen = env->GetArrayLength(array);
     86         if (fLen < minLength) {
     87             sk_throw();
     88         }
     89         fPtr = env->GetIntArrayElements(array, NULL);
     90     }
     91 }
     92 
     93 AutoJavaIntArray::~AutoJavaIntArray() {
     94     if (fPtr) {
     95         fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
     96     }
     97 }
     98 
     99 AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
    100                                        int minLength, JNIAccess access)
    101 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
    102     SkASSERT(env);
    103     if (array) {
    104         fLen = env->GetArrayLength(array);
    105         if (fLen < minLength) {
    106             sk_throw();
    107         }
    108         fPtr = env->GetShortArrayElements(array, NULL);
    109     }
    110     fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
    111 }
    112 
    113 AutoJavaShortArray::~AutoJavaShortArray() {
    114     if (fPtr) {
    115         fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
    116     }
    117 }
    118 
    119 AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
    120                                        int minLength)
    121 : fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
    122     SkASSERT(env);
    123     if (array) {
    124         fLen = env->GetArrayLength(array);
    125         if (fLen < minLength) {
    126             sk_throw();
    127         }
    128         fPtr = env->GetByteArrayElements(array, NULL);
    129     }
    130 }
    131 
    132 AutoJavaByteArray::~AutoJavaByteArray() {
    133     if (fPtr) {
    134         fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
    135     }
    136 }
    137 
    138 ///////////////////////////////////////////////////////////////////////////////
    139 
    140 static jclass   gRect_class;
    141 static jfieldID gRect_leftFieldID;
    142 static jfieldID gRect_topFieldID;
    143 static jfieldID gRect_rightFieldID;
    144 static jfieldID gRect_bottomFieldID;
    145 
    146 static jclass   gRectF_class;
    147 static jfieldID gRectF_leftFieldID;
    148 static jfieldID gRectF_topFieldID;
    149 static jfieldID gRectF_rightFieldID;
    150 static jfieldID gRectF_bottomFieldID;
    151 
    152 static jclass   gPoint_class;
    153 static jfieldID gPoint_xFieldID;
    154 static jfieldID gPoint_yFieldID;
    155 
    156 static jclass   gPointF_class;
    157 static jfieldID gPointF_xFieldID;
    158 static jfieldID gPointF_yFieldID;
    159 
    160 static jclass   gBitmap_class;
    161 static jfieldID gBitmap_nativePtr;
    162 static jmethodID gBitmap_constructorMethodID;
    163 static jmethodID gBitmap_reinitMethodID;
    164 static jmethodID gBitmap_getAllocationByteCountMethodID;
    165 
    166 static jclass   gBitmapConfig_class;
    167 static jfieldID gBitmapConfig_nativeInstanceID;
    168 
    169 static jclass   gBitmapRegionDecoder_class;
    170 static jmethodID gBitmapRegionDecoder_constructorMethodID;
    171 
    172 static jclass   gCanvas_class;
    173 static jfieldID gCanvas_nativeInstanceID;
    174 
    175 static jclass   gPicture_class;
    176 static jfieldID gPicture_nativeInstanceID;
    177 
    178 static jclass   gRegion_class;
    179 static jfieldID gRegion_nativeInstanceID;
    180 static jmethodID gRegion_constructorMethodID;
    181 
    182 static jclass    gByte_class;
    183 static jobject   gVMRuntime;
    184 static jclass    gVMRuntime_class;
    185 static jmethodID gVMRuntime_newNonMovableArray;
    186 static jmethodID gVMRuntime_addressOf;
    187 
    188 ///////////////////////////////////////////////////////////////////////////////
    189 
    190 void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
    191 {
    192     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    193 
    194     *L = env->GetIntField(obj, gRect_leftFieldID);
    195     *T = env->GetIntField(obj, gRect_topFieldID);
    196     *R = env->GetIntField(obj, gRect_rightFieldID);
    197     *B = env->GetIntField(obj, gRect_bottomFieldID);
    198 }
    199 
    200 void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
    201 {
    202     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    203 
    204     env->SetIntField(obj, gRect_leftFieldID, L);
    205     env->SetIntField(obj, gRect_topFieldID, T);
    206     env->SetIntField(obj, gRect_rightFieldID, R);
    207     env->SetIntField(obj, gRect_bottomFieldID, B);
    208 }
    209 
    210 SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
    211 {
    212     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    213 
    214     ir->set(env->GetIntField(obj, gRect_leftFieldID),
    215             env->GetIntField(obj, gRect_topFieldID),
    216             env->GetIntField(obj, gRect_rightFieldID),
    217             env->GetIntField(obj, gRect_bottomFieldID));
    218     return ir;
    219 }
    220 
    221 void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
    222 {
    223     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    224 
    225     env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
    226     env->SetIntField(obj, gRect_topFieldID, ir.fTop);
    227     env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
    228     env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
    229 }
    230 
    231 SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
    232 {
    233     SkASSERT(env->IsInstanceOf(obj, gRectF_class));
    234 
    235     r->set(env->GetFloatField(obj, gRectF_leftFieldID),
    236            env->GetFloatField(obj, gRectF_topFieldID),
    237            env->GetFloatField(obj, gRectF_rightFieldID),
    238            env->GetFloatField(obj, gRectF_bottomFieldID));
    239     return r;
    240 }
    241 
    242 SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
    243 {
    244     SkASSERT(env->IsInstanceOf(obj, gRect_class));
    245 
    246     r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
    247            SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
    248            SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
    249            SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
    250     return r;
    251 }
    252 
    253 void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
    254 {
    255     SkASSERT(env->IsInstanceOf(obj, gRectF_class));
    256 
    257     env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
    258     env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
    259     env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
    260     env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
    261 }
    262 
    263 SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
    264 {
    265     SkASSERT(env->IsInstanceOf(obj, gPoint_class));
    266 
    267     point->set(env->GetIntField(obj, gPoint_xFieldID),
    268                env->GetIntField(obj, gPoint_yFieldID));
    269     return point;
    270 }
    271 
    272 void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
    273 {
    274     SkASSERT(env->IsInstanceOf(obj, gPoint_class));
    275 
    276     env->SetIntField(obj, gPoint_xFieldID, ir.fX);
    277     env->SetIntField(obj, gPoint_yFieldID, ir.fY);
    278 }
    279 
    280 SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
    281 {
    282     SkASSERT(env->IsInstanceOf(obj, gPointF_class));
    283 
    284     point->set(env->GetIntField(obj, gPointF_xFieldID),
    285                env->GetIntField(obj, gPointF_yFieldID));
    286     return point;
    287 }
    288 
    289 void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
    290 {
    291     SkASSERT(env->IsInstanceOf(obj, gPointF_class));
    292 
    293     env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
    294     env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
    295 }
    296 
    297 // This enum must keep these int values, to match the int values
    298 // in the java Bitmap.Config enum.
    299 enum LegacyBitmapConfig {
    300     kNo_LegacyBitmapConfig          = 0,
    301     kA8_LegacyBitmapConfig          = 1,
    302     kIndex8_LegacyBitmapConfig      = 2,
    303     kRGB_565_LegacyBitmapConfig     = 3,
    304     kARGB_4444_LegacyBitmapConfig   = 4,
    305     kARGB_8888_LegacyBitmapConfig   = 5,
    306 
    307     kLastEnum_LegacyBitmapConfig = kARGB_8888_LegacyBitmapConfig
    308 };
    309 
    310 jint GraphicsJNI::colorTypeToLegacyBitmapConfig(SkColorType colorType) {
    311     switch (colorType) {
    312         case kN32_SkColorType:
    313             return kARGB_8888_LegacyBitmapConfig;
    314         case kARGB_4444_SkColorType:
    315             return kARGB_4444_LegacyBitmapConfig;
    316         case kRGB_565_SkColorType:
    317             return kRGB_565_LegacyBitmapConfig;
    318         case kIndex_8_SkColorType:
    319             return kIndex8_LegacyBitmapConfig;
    320         case kAlpha_8_SkColorType:
    321             return kA8_LegacyBitmapConfig;
    322         case kUnknown_SkColorType:
    323         default:
    324             break;
    325     }
    326     return kNo_LegacyBitmapConfig;
    327 }
    328 
    329 SkColorType GraphicsJNI::legacyBitmapConfigToColorType(jint legacyConfig) {
    330     const uint8_t gConfig2ColorType[] = {
    331         kUnknown_SkColorType,
    332         kAlpha_8_SkColorType,
    333         kIndex_8_SkColorType,
    334         kRGB_565_SkColorType,
    335         kARGB_4444_SkColorType,
    336         kN32_SkColorType
    337     };
    338 
    339     if (legacyConfig < 0 || legacyConfig > kLastEnum_LegacyBitmapConfig) {
    340         legacyConfig = kNo_LegacyBitmapConfig;
    341     }
    342     return static_cast<SkColorType>(gConfig2ColorType[legacyConfig]);
    343 }
    344 
    345 android::Bitmap* GraphicsJNI::getBitmap(JNIEnv* env, jobject bitmap) {
    346     SkASSERT(env);
    347     SkASSERT(bitmap);
    348     SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
    349     jlong bitmapHandle = env->GetLongField(bitmap, gBitmap_nativePtr);
    350     android::Bitmap* b = reinterpret_cast<android::Bitmap*>(bitmapHandle);
    351     SkASSERT(b);
    352     return b;
    353 }
    354 
    355 void GraphicsJNI::getSkBitmap(JNIEnv* env, jobject bitmap, SkBitmap* outBitmap) {
    356     getBitmap(env, bitmap)->getSkBitmap(outBitmap);
    357 }
    358 
    359 SkPixelRef* GraphicsJNI::refSkPixelRef(JNIEnv* env, jobject bitmap) {
    360     return getBitmap(env, bitmap)->refPixelRef();
    361 }
    362 
    363 SkColorType GraphicsJNI::getNativeBitmapColorType(JNIEnv* env, jobject jconfig) {
    364     SkASSERT(env);
    365     if (NULL == jconfig) {
    366         return kUnknown_SkColorType;
    367     }
    368     SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
    369     int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
    370     return legacyBitmapConfigToColorType(c);
    371 }
    372 
    373 android::Canvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
    374     SkASSERT(env);
    375     SkASSERT(canvas);
    376     SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
    377     jlong canvasHandle = env->GetLongField(canvas, gCanvas_nativeInstanceID);
    378     if (!canvasHandle) {
    379         return NULL;
    380     }
    381     return reinterpret_cast<android::Canvas*>(canvasHandle);
    382 }
    383 
    384 SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
    385 {
    386     SkASSERT(env);
    387     SkASSERT(region);
    388     SkASSERT(env->IsInstanceOf(region, gRegion_class));
    389     jlong regionHandle = env->GetLongField(region, gRegion_nativeInstanceID);
    390     SkRegion* r = reinterpret_cast<SkRegion*>(regionHandle);
    391     SkASSERT(r);
    392     return r;
    393 }
    394 
    395 ///////////////////////////////////////////////////////////////////////////////////////////
    396 
    397 // Assert that bitmap's SkAlphaType is consistent with isPremultiplied.
    398 static void assert_premultiplied(const SkImageInfo& info, bool isPremultiplied) {
    399     // kOpaque_SkAlphaType and kIgnore_SkAlphaType mean that isPremultiplied is
    400     // irrelevant. This just tests to ensure that the SkAlphaType is not
    401     // opposite of isPremultiplied.
    402     if (isPremultiplied) {
    403         SkASSERT(info.alphaType() != kUnpremul_SkAlphaType);
    404     } else {
    405         SkASSERT(info.alphaType() != kPremul_SkAlphaType);
    406     }
    407 }
    408 
    409 jobject GraphicsJNI::createBitmap(JNIEnv* env, android::Bitmap* bitmap,
    410         int bitmapCreateFlags, jbyteArray ninePatchChunk, jobject ninePatchInsets,
    411         int density) {
    412     bool isMutable = bitmapCreateFlags & kBitmapCreateFlag_Mutable;
    413     bool isPremultiplied = bitmapCreateFlags & kBitmapCreateFlag_Premultiplied;
    414     // The caller needs to have already set the alpha type properly, so the
    415     // native SkBitmap stays in sync with the Java Bitmap.
    416     assert_premultiplied(bitmap->info(), isPremultiplied);
    417 
    418     jobject obj = env->NewObject(gBitmap_class, gBitmap_constructorMethodID,
    419             reinterpret_cast<jlong>(bitmap), bitmap->javaByteArray(),
    420             bitmap->width(), bitmap->height(), density, isMutable, isPremultiplied,
    421             ninePatchChunk, ninePatchInsets);
    422     hasException(env); // For the side effect of logging.
    423     return obj;
    424 }
    425 
    426 void GraphicsJNI::reinitBitmap(JNIEnv* env, jobject javaBitmap, const SkImageInfo& info,
    427         bool isPremultiplied)
    428 {
    429     // The caller needs to have already set the alpha type properly, so the
    430     // native SkBitmap stays in sync with the Java Bitmap.
    431     assert_premultiplied(info, isPremultiplied);
    432 
    433     env->CallVoidMethod(javaBitmap, gBitmap_reinitMethodID,
    434             info.width(), info.height(), isPremultiplied);
    435 }
    436 
    437 int GraphicsJNI::getBitmapAllocationByteCount(JNIEnv* env, jobject javaBitmap)
    438 {
    439     return env->CallIntMethod(javaBitmap, gBitmap_getAllocationByteCountMethodID);
    440 }
    441 
    442 jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
    443 {
    444     SkASSERT(bitmap != NULL);
    445 
    446     jobject obj = env->NewObject(gBitmapRegionDecoder_class,
    447             gBitmapRegionDecoder_constructorMethodID,
    448             reinterpret_cast<jlong>(bitmap));
    449     hasException(env); // For the side effect of logging.
    450     return obj;
    451 }
    452 
    453 jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
    454 {
    455     SkASSERT(region != NULL);
    456     jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
    457                                  reinterpret_cast<jlong>(region), 0);
    458     hasException(env); // For the side effect of logging.
    459     return obj;
    460 }
    461 
    462 static JNIEnv* vm2env(JavaVM* vm)
    463 {
    464     JNIEnv* env = NULL;
    465     if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
    466     {
    467         SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
    468         sk_throw();
    469     }
    470     return env;
    471 }
    472 
    473 ///////////////////////////////////////////////////////////////////////////////
    474 
    475 static bool computeAllocationSize(const SkBitmap& bitmap, size_t* size) {
    476     int32_t rowBytes32 = SkToS32(bitmap.rowBytes());
    477     int64_t bigSize = (int64_t)bitmap.height() * rowBytes32;
    478     if (rowBytes32 < 0 || !sk_64_isS32(bigSize)) {
    479         return false; // allocation will be too large
    480     }
    481 
    482     *size = sk_64_asS32(bigSize);
    483     return true;
    484 }
    485 
    486 android::Bitmap* GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
    487                                              SkColorTable* ctable) {
    488     const SkImageInfo& info = bitmap->info();
    489     if (info.colorType() == kUnknown_SkColorType) {
    490         doThrowIAE(env, "unknown bitmap configuration");
    491         return NULL;
    492     }
    493 
    494     size_t size;
    495     if (!computeAllocationSize(*bitmap, &size)) {
    496         return NULL;
    497     }
    498 
    499     // we must respect the rowBytes value already set on the bitmap instead of
    500     // attempting to compute our own.
    501     const size_t rowBytes = bitmap->rowBytes();
    502 
    503     jbyteArray arrayObj = (jbyteArray) env->CallObjectMethod(gVMRuntime,
    504                                                              gVMRuntime_newNonMovableArray,
    505                                                              gByte_class, size);
    506     if (env->ExceptionCheck() != 0) {
    507         return NULL;
    508     }
    509     SkASSERT(arrayObj);
    510     jbyte* addr = (jbyte*) env->CallLongMethod(gVMRuntime, gVMRuntime_addressOf, arrayObj);
    511     if (env->ExceptionCheck() != 0) {
    512         return NULL;
    513     }
    514     SkASSERT(addr);
    515     android::Bitmap* wrapper = new android::Bitmap(env, arrayObj, (void*) addr,
    516             info, rowBytes, ctable);
    517     wrapper->getSkBitmap(bitmap);
    518     // since we're already allocated, we lockPixels right away
    519     // HeapAllocator behaves this way too
    520     bitmap->lockPixels();
    521 
    522     return wrapper;
    523 }
    524 
    525 struct AndroidPixelRefContext {
    526     int32_t stableID;
    527 };
    528 
    529 static void allocatePixelsReleaseProc(void* ptr, void* ctx) {
    530     AndroidPixelRefContext* context = (AndroidPixelRefContext*)ctx;
    531     if (android::uirenderer::Caches::hasInstance()) {
    532          android::uirenderer::Caches::getInstance().textureCache.releaseTexture(context->stableID);
    533     }
    534 
    535     sk_free(ptr);
    536     delete context;
    537 }
    538 
    539 bool GraphicsJNI::allocatePixels(JNIEnv* env, SkBitmap* bitmap, SkColorTable* ctable) {
    540     const SkImageInfo& info = bitmap->info();
    541     if (info.colorType() == kUnknown_SkColorType) {
    542         doThrowIAE(env, "unknown bitmap configuration");
    543         return NULL;
    544     }
    545 
    546     size_t size;
    547     if (!computeAllocationSize(*bitmap, &size)) {
    548         return false;
    549     }
    550 
    551     // we must respect the rowBytes value already set on the bitmap instead of
    552     // attempting to compute our own.
    553     const size_t rowBytes = bitmap->rowBytes();
    554 
    555     void* addr = sk_malloc_flags(size, 0);
    556     if (NULL == addr) {
    557         return false;
    558     }
    559 
    560     AndroidPixelRefContext* context = new AndroidPixelRefContext;
    561     SkMallocPixelRef* pr = SkMallocPixelRef::NewWithProc(info, rowBytes, ctable, addr,
    562                                                          &allocatePixelsReleaseProc, context);
    563     if (!pr) {
    564         delete context;
    565         return false;
    566     }
    567 
    568     // set the stableID in the context so that it can be used later in
    569     // allocatePixelsReleaseProc to remove the texture from the cache.
    570     context->stableID = pr->getStableID();
    571 
    572     bitmap->setPixelRef(pr)->unref();
    573     // since we're already allocated, we can lockPixels right away
    574     bitmap->lockPixels();
    575 
    576     return true;
    577 }
    578 
    579 android::Bitmap* GraphicsJNI::allocateAshmemPixelRef(JNIEnv* env, SkBitmap* bitmap,
    580                                                      SkColorTable* ctable) {
    581     int fd;
    582 
    583     const SkImageInfo& info = bitmap->info();
    584     if (info.colorType() == kUnknown_SkColorType) {
    585         doThrowIAE(env, "unknown bitmap configuration");
    586         return nullptr;
    587     }
    588 
    589     size_t size;
    590     if (!computeAllocationSize(*bitmap, &size)) {
    591         return nullptr;
    592     }
    593 
    594     // we must respect the rowBytes value already set on the bitmap instead of
    595     // attempting to compute our own.
    596     const size_t rowBytes = bitmap->rowBytes();
    597 
    598     // Create new ashmem region with read/write priv
    599     fd = ashmem_create_region("bitmap", size);
    600     if (fd < 0) {
    601         return nullptr;
    602     }
    603 
    604     void* addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    605     if (addr == MAP_FAILED) {
    606         close(fd);
    607         return nullptr;
    608     }
    609 
    610     if (ashmem_set_prot_region(fd, PROT_READ) < 0) {
    611         munmap(addr, size);
    612         close(fd);
    613         return nullptr;
    614     }
    615 
    616     android::Bitmap* wrapper = new android::Bitmap(addr, fd, info, rowBytes, ctable);
    617     wrapper->getSkBitmap(bitmap);
    618     // since we're already allocated, we lockPixels right away
    619     // HeapAllocator behaves this way too
    620     bitmap->lockPixels();
    621 
    622     return wrapper;
    623 }
    624 
    625 android::Bitmap* GraphicsJNI::mapAshmemPixelRef(JNIEnv* env, SkBitmap* bitmap,
    626         SkColorTable* ctable, int fd, void* addr, bool readOnly) {
    627     const SkImageInfo& info = bitmap->info();
    628     if (info.colorType() == kUnknown_SkColorType) {
    629         doThrowIAE(env, "unknown bitmap configuration");
    630         return nullptr;
    631     }
    632 
    633     if (!addr) {
    634         // Map existing ashmem region if not already mapped.
    635         int flags = readOnly ? (PROT_READ) : (PROT_READ | PROT_WRITE);
    636         addr = mmap(NULL, ashmem_get_size_region(fd), flags, MAP_SHARED, fd, 0);
    637         if (addr == MAP_FAILED) {
    638             return nullptr;
    639         }
    640     }
    641 
    642     // we must respect the rowBytes value already set on the bitmap instead of
    643     // attempting to compute our own.
    644     const size_t rowBytes = bitmap->rowBytes();
    645 
    646     android::Bitmap* wrapper = new android::Bitmap(addr, fd, info, rowBytes, ctable);
    647     wrapper->getSkBitmap(bitmap);
    648     if (readOnly) {
    649         bitmap->pixelRef()->setImmutable();
    650     }
    651     // since we're already allocated, we lockPixels right away
    652     // HeapAllocator behaves this way too
    653     bitmap->lockPixels();
    654 
    655     return wrapper;
    656 }
    657 
    658 ///////////////////////////////////////////////////////////////////////////////
    659 
    660 JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env) {
    661     LOG_ALWAYS_FATAL_IF(env->GetJavaVM(&mJavaVM) != JNI_OK,
    662             "env->GetJavaVM failed");
    663 }
    664 
    665 JavaPixelAllocator::~JavaPixelAllocator() {
    666     if (mStorage) {
    667         mStorage->detachFromJava();
    668     }
    669 }
    670 
    671 bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
    672     JNIEnv* env = vm2env(mJavaVM);
    673 
    674     mStorage = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
    675     return mStorage != nullptr;
    676 }
    677 
    678 ////////////////////////////////////////////////////////////////////////////////
    679 
    680 RecyclingClippingPixelAllocator::RecyclingClippingPixelAllocator(
    681         android::Bitmap* recycledBitmap, size_t recycledBytes)
    682     : mRecycledBitmap(recycledBitmap)
    683     , mRecycledBytes(recycledBytes)
    684     , mSkiaBitmap(nullptr)
    685     , mNeedsCopy(false)
    686 {}
    687 
    688 RecyclingClippingPixelAllocator::~RecyclingClippingPixelAllocator() {}
    689 
    690 bool RecyclingClippingPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
    691     // Ensure that the caller did not pass in a NULL bitmap to the constructor or this
    692     // function.
    693     LOG_ALWAYS_FATAL_IF(!mRecycledBitmap);
    694     LOG_ALWAYS_FATAL_IF(!bitmap);
    695     mSkiaBitmap = bitmap;
    696 
    697     // This behaves differently than the RecyclingPixelAllocator.  For backwards
    698     // compatibility, the original color type of the recycled bitmap must be maintained.
    699     if (mRecycledBitmap->info().colorType() != bitmap->colorType()) {
    700         return false;
    701     }
    702 
    703     // The Skia bitmap specifies the width and height needed by the decoder.
    704     // mRecycledBitmap specifies the width and height of the bitmap that we
    705     // want to reuse.  Neither can be changed.  We will try to find a way
    706     // to reuse the memory.
    707     const int maxWidth = SkTMax(bitmap->width(), mRecycledBitmap->info().width());
    708     const int maxHeight = SkTMax(bitmap->height(), mRecycledBitmap->info().height());
    709     const SkImageInfo maxInfo = bitmap->info().makeWH(maxWidth, maxHeight);
    710     const size_t rowBytes = maxInfo.minRowBytes();
    711     const size_t bytesNeeded = maxInfo.getSafeSize(rowBytes);
    712     if (bytesNeeded <= mRecycledBytes) {
    713         // Here we take advantage of reconfigure() to reset the rowBytes and ctable
    714         // of mRecycledBitmap.  It is very important that we pass in
    715         // mRecycledBitmap->info() for the SkImageInfo.  According to the
    716         // specification for BitmapRegionDecoder, we are not allowed to change
    717         // the SkImageInfo.
    718         mRecycledBitmap->reconfigure(mRecycledBitmap->info(), rowBytes, ctable);
    719 
    720         // This call will give the bitmap the same pixelRef as mRecycledBitmap.
    721         bitmap->setPixelRef(mRecycledBitmap->refPixelRef())->unref();
    722 
    723         // Make sure that the recycled bitmap has the correct alpha type.
    724         mRecycledBitmap->setAlphaType(bitmap->alphaType());
    725 
    726         bitmap->notifyPixelsChanged();
    727         bitmap->lockPixels();
    728         mNeedsCopy = false;
    729 
    730         // TODO: If the dimensions of the SkBitmap are smaller than those of
    731         // mRecycledBitmap, should we zero the memory in mRecycledBitmap?
    732         return true;
    733     }
    734 
    735     // In the event that mRecycledBitmap is not large enough, allocate new memory
    736     // on the heap.
    737     SkBitmap::HeapAllocator heapAllocator;
    738 
    739     // We will need to copy from heap memory to mRecycledBitmap's memory after the
    740     // decode is complete.
    741     mNeedsCopy = true;
    742 
    743     return heapAllocator.allocPixelRef(bitmap, ctable);
    744 }
    745 
    746 void RecyclingClippingPixelAllocator::copyIfNecessary() {
    747     if (mNeedsCopy) {
    748         SkPixelRef* recycledPixels = mRecycledBitmap->refPixelRef();
    749         void* dst = recycledPixels->pixels();
    750         const size_t dstRowBytes = mRecycledBitmap->rowBytes();
    751         const size_t bytesToCopy = std::min(mRecycledBitmap->info().minRowBytes(),
    752                 mSkiaBitmap->info().minRowBytes());
    753         const int rowsToCopy = std::min(mRecycledBitmap->info().height(),
    754                 mSkiaBitmap->info().height());
    755         for (int y = 0; y < rowsToCopy; y++) {
    756             memcpy(dst, mSkiaBitmap->getAddr(0, y), bytesToCopy);
    757             dst = SkTAddOffset<void>(dst, dstRowBytes);
    758         }
    759         recycledPixels->notifyPixelsChanged();
    760         recycledPixels->unref();
    761     }
    762     mRecycledBitmap = nullptr;
    763     mSkiaBitmap = nullptr;
    764 }
    765 
    766 ////////////////////////////////////////////////////////////////////////////////
    767 
    768 AshmemPixelAllocator::AshmemPixelAllocator(JNIEnv *env) {
    769     LOG_ALWAYS_FATAL_IF(env->GetJavaVM(&mJavaVM) != JNI_OK,
    770             "env->GetJavaVM failed");
    771 }
    772 
    773 AshmemPixelAllocator::~AshmemPixelAllocator() {
    774     if (mStorage) {
    775         mStorage->detachFromJava();
    776     }
    777 }
    778 
    779 bool AshmemPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
    780     JNIEnv* env = vm2env(mJavaVM);
    781     mStorage = GraphicsJNI::allocateAshmemPixelRef(env, bitmap, ctable);
    782     return mStorage != nullptr;
    783 }
    784 
    785 ////////////////////////////////////////////////////////////////////////////////
    786 
    787 static jclass make_globalref(JNIEnv* env, const char classname[])
    788 {
    789     jclass c = env->FindClass(classname);
    790     SkASSERT(c);
    791     return (jclass) env->NewGlobalRef(c);
    792 }
    793 
    794 static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
    795                                 const char fieldname[], const char type[])
    796 {
    797     jfieldID id = env->GetFieldID(clazz, fieldname, type);
    798     SkASSERT(id);
    799     return id;
    800 }
    801 
    802 int register_android_graphics_Graphics(JNIEnv* env)
    803 {
    804     jmethodID m;
    805     jclass c;
    806 
    807     gRect_class = make_globalref(env, "android/graphics/Rect");
    808     gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
    809     gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
    810     gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
    811     gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
    812 
    813     gRectF_class = make_globalref(env, "android/graphics/RectF");
    814     gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
    815     gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
    816     gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
    817     gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
    818 
    819     gPoint_class = make_globalref(env, "android/graphics/Point");
    820     gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
    821     gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
    822 
    823     gPointF_class = make_globalref(env, "android/graphics/PointF");
    824     gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
    825     gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
    826 
    827     gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
    828     gBitmap_nativePtr = getFieldIDCheck(env, gBitmap_class, "mNativePtr", "J");
    829     gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>", "(J[BIIIZZ[BLandroid/graphics/NinePatch$InsetStruct;)V");
    830     gBitmap_reinitMethodID = env->GetMethodID(gBitmap_class, "reinit", "(IIZ)V");
    831     gBitmap_getAllocationByteCountMethodID = env->GetMethodID(gBitmap_class, "getAllocationByteCount", "()I");
    832     gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
    833     gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(J)V");
    834 
    835     gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
    836     gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
    837                                                      "nativeInt", "I");
    838 
    839     gCanvas_class = make_globalref(env, "android/graphics/Canvas");
    840     gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvasWrapper", "J");
    841 
    842     gPicture_class = make_globalref(env, "android/graphics/Picture");
    843     gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "J");
    844 
    845     gRegion_class = make_globalref(env, "android/graphics/Region");
    846     gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "J");
    847     gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
    848         "(JI)V");
    849 
    850     c = env->FindClass("java/lang/Byte");
    851     gByte_class = (jclass) env->NewGlobalRef(
    852         env->GetStaticObjectField(c, env->GetStaticFieldID(c, "TYPE", "Ljava/lang/Class;")));
    853 
    854     gVMRuntime_class = make_globalref(env, "dalvik/system/VMRuntime");
    855     m = env->GetStaticMethodID(gVMRuntime_class, "getRuntime", "()Ldalvik/system/VMRuntime;");
    856     gVMRuntime = env->NewGlobalRef(env->CallStaticObjectMethod(gVMRuntime_class, m));
    857     gVMRuntime_newNonMovableArray = env->GetMethodID(gVMRuntime_class, "newNonMovableArray",
    858                                                      "(Ljava/lang/Class;I)Ljava/lang/Object;");
    859     gVMRuntime_addressOf = env->GetMethodID(gVMRuntime_class, "addressOf", "(Ljava/lang/Object;)J");
    860 
    861     return 0;
    862 }
    863