Graphics.cpp revision a0398430fcf365fba6e42ad0bdca2fbf45ed6fe0 
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
13void doThrowNPE(JNIEnv* env) {
14    jniThrowNullPointerException(env, NULL);
15}
16
17void doThrowAIOOBE(JNIEnv* env) {
18    jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
19}
20
21void doThrowRE(JNIEnv* env, const char* msg) {
22    jniThrowRuntimeException(env, msg);
23}
24
25void doThrowIAE(JNIEnv* env, const char* msg) {
26    jniThrowException(env, "java/lang/IllegalArgumentException", msg);
27}
28
29void doThrowISE(JNIEnv* env, const char* msg) {
30    jniThrowException(env, "java/lang/IllegalStateException", msg);
31}
32
33void doThrowOOME(JNIEnv* env, const char* msg) {
34    jniThrowException(env, "java/lang/OutOfMemoryError", msg);
35}
36
37void doThrowIOE(JNIEnv* env, const char* msg) {
38    jniThrowException(env, "java/io/IOException", msg);
39}
40
41bool 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
52AutoJavaFloatArray::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
66AutoJavaFloatArray::~AutoJavaFloatArray() {
67    if (fPtr) {
68        fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
69    }
70}
71
72AutoJavaIntArray::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
85AutoJavaIntArray::~AutoJavaIntArray() {
86    if (fPtr) {
87        fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
88    }
89}
90
91AutoJavaShortArray::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
105AutoJavaShortArray::~AutoJavaShortArray() {
106    if (fPtr) {
107        fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
108    }
109}
110
111AutoJavaByteArray::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
124AutoJavaByteArray::~AutoJavaByteArray() {
125    if (fPtr) {
126        fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
127    }
128}
129
130///////////////////////////////////////////////////////////////////////////////
131
132static jclass   gRect_class;
133static jfieldID gRect_leftFieldID;
134static jfieldID gRect_topFieldID;
135static jfieldID gRect_rightFieldID;
136static jfieldID gRect_bottomFieldID;
137
138static jclass   gRectF_class;
139static jfieldID gRectF_leftFieldID;
140static jfieldID gRectF_topFieldID;
141static jfieldID gRectF_rightFieldID;
142static jfieldID gRectF_bottomFieldID;
143
144static jclass   gPoint_class;
145static jfieldID gPoint_xFieldID;
146static jfieldID gPoint_yFieldID;
147
148static jclass   gPointF_class;
149static jfieldID gPointF_xFieldID;
150static jfieldID gPointF_yFieldID;
151
152static jclass   gBitmap_class;
153static jfieldID gBitmap_nativeInstanceID;
154static jmethodID gBitmap_constructorMethodID;
155static jmethodID gBitmap_reinitMethodID;
156static jmethodID gBitmap_getAllocationByteCountMethodID;
157
158static jclass   gBitmapConfig_class;
159static jfieldID gBitmapConfig_nativeInstanceID;
160
161static jclass   gBitmapRegionDecoder_class;
162static jmethodID gBitmapRegionDecoder_constructorMethodID;
163
164static jclass   gCanvas_class;
165static jfieldID gCanvas_nativeInstanceID;
166
167static jclass   gPaint_class;
168static jfieldID gPaint_nativeInstanceID;
169
170static jclass   gPicture_class;
171static jfieldID gPicture_nativeInstanceID;
172
173static jclass   gRegion_class;
174static jfieldID gRegion_nativeInstanceID;
175static jmethodID gRegion_constructorMethodID;
176
177static jclass    gByte_class;
178static jobject   gVMRuntime;
179static jclass    gVMRuntime_class;
180static jmethodID gVMRuntime_newNonMovableArray;
181static jmethodID gVMRuntime_addressOf;
182
183///////////////////////////////////////////////////////////////////////////////
184
185void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
186{
187    SkASSERT(env->IsInstanceOf(obj, gRect_class));
188
189    *L = env->GetIntField(obj, gRect_leftFieldID);
190    *T = env->GetIntField(obj, gRect_topFieldID);
191    *R = env->GetIntField(obj, gRect_rightFieldID);
192    *B = env->GetIntField(obj, gRect_bottomFieldID);
193}
194
195void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
196{
197    SkASSERT(env->IsInstanceOf(obj, gRect_class));
198
199    env->SetIntField(obj, gRect_leftFieldID, L);
200    env->SetIntField(obj, gRect_topFieldID, T);
201    env->SetIntField(obj, gRect_rightFieldID, R);
202    env->SetIntField(obj, gRect_bottomFieldID, B);
203}
204
205SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
206{
207    SkASSERT(env->IsInstanceOf(obj, gRect_class));
208
209    ir->set(env->GetIntField(obj, gRect_leftFieldID),
210            env->GetIntField(obj, gRect_topFieldID),
211            env->GetIntField(obj, gRect_rightFieldID),
212            env->GetIntField(obj, gRect_bottomFieldID));
213    return ir;
214}
215
216void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
217{
218    SkASSERT(env->IsInstanceOf(obj, gRect_class));
219
220    env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
221    env->SetIntField(obj, gRect_topFieldID, ir.fTop);
222    env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
223    env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
224}
225
226SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
227{
228    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
229
230    r->set(SkFloatToScalar(env->GetFloatField(obj, gRectF_leftFieldID)),
231           SkFloatToScalar(env->GetFloatField(obj, gRectF_topFieldID)),
232           SkFloatToScalar(env->GetFloatField(obj, gRectF_rightFieldID)),
233           SkFloatToScalar(env->GetFloatField(obj, gRectF_bottomFieldID)));
234    return r;
235}
236
237SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
238{
239    SkASSERT(env->IsInstanceOf(obj, gRect_class));
240
241    r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
242           SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
243           SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
244           SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
245    return r;
246}
247
248void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
249{
250    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
251
252    env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
253    env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
254    env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
255    env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
256}
257
258SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
259{
260    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
261
262    point->set(env->GetIntField(obj, gPoint_xFieldID),
263               env->GetIntField(obj, gPoint_yFieldID));
264    return point;
265}
266
267void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
268{
269    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
270
271    env->SetIntField(obj, gPoint_xFieldID, ir.fX);
272    env->SetIntField(obj, gPoint_yFieldID, ir.fY);
273}
274
275SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
276{
277    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
278
279    point->set(SkFloatToScalar(env->GetIntField(obj, gPointF_xFieldID)),
280               SkFloatToScalar(env->GetIntField(obj, gPointF_yFieldID)));
281    return point;
282}
283
284void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
285{
286    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
287
288    env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
289    env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
290}
291
292SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
293    SkASSERT(env);
294    SkASSERT(bitmap);
295    SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
296    jlong bitmapHandle = env->GetLongField(bitmap, gBitmap_nativeInstanceID);
297    SkBitmap* b = reinterpret_cast<SkBitmap*>(bitmapHandle);
298    SkASSERT(b);
299    return b;
300}
301
302SkBitmap::Config GraphicsJNI::getNativeBitmapConfig(JNIEnv* env,
303                                                    jobject jconfig) {
304    SkASSERT(env);
305    if (NULL == jconfig) {
306        return SkBitmap::kNo_Config;
307    }
308    SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
309    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
310    if (c < 0 || c >= SkBitmap::kConfigCount) {
311        c = SkBitmap::kNo_Config;
312    }
313    return static_cast<SkBitmap::Config>(c);
314}
315
316SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
317    SkASSERT(env);
318    SkASSERT(canvas);
319    SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
320    jlong canvasHandle = env->GetLongField(canvas, gCanvas_nativeInstanceID);
321    SkCanvas* c = reinterpret_cast<SkCanvas*>(canvasHandle);
322    SkASSERT(c);
323    return c;
324}
325
326SkPaint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
327    SkASSERT(env);
328    SkASSERT(paint);
329    SkASSERT(env->IsInstanceOf(paint, gPaint_class));
330    jlong paintHandle = env->GetLongField(paint, gPaint_nativeInstanceID);
331    SkPaint* p = reinterpret_cast<SkPaint*>(paintHandle);
332    SkASSERT(p);
333    return p;
334}
335
336SkPicture* GraphicsJNI::getNativePicture(JNIEnv* env, jobject picture)
337{
338    SkASSERT(env);
339    SkASSERT(picture);
340    SkASSERT(env->IsInstanceOf(picture, gPicture_class));
341    jlong pictureHandle = env->GetLongField(picture, gPicture_nativeInstanceID);
342    SkPicture* p = reinterpret_cast<SkPicture*>(pictureHandle);
343    SkASSERT(p);
344    return p;
345}
346
347SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
348{
349    SkASSERT(env);
350    SkASSERT(region);
351    SkASSERT(env->IsInstanceOf(region, gRegion_class));
352    jlong regionHandle = env->GetLongField(region, gRegion_nativeInstanceID);
353    SkRegion* r = reinterpret_cast<SkRegion*>(regionHandle);
354    SkASSERT(r);
355    return r;
356}
357
358///////////////////////////////////////////////////////////////////////////////////////////
359
360jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
361        int bitmapCreateFlags, jbyteArray ninepatch, jintArray layoutbounds, int density)
362{
363    SkASSERT(bitmap);
364    SkASSERT(bitmap->pixelRef());
365    bool isMutable = bitmapCreateFlags & kBitmapCreateFlag_Mutable;
366    bool isPremultiplied = bitmapCreateFlags & kBitmapCreateFlag_Premultiplied;
367
368    jobject obj = env->NewObject(gBitmap_class, gBitmap_constructorMethodID,
369            reinterpret_cast<jlong>(bitmap), buffer,
370            bitmap->width(), bitmap->height(), density, isMutable, isPremultiplied,
371            ninepatch, layoutbounds);
372    hasException(env); // For the side effect of logging.
373    return obj;
374}
375
376jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, int bitmapCreateFlags,
377        jbyteArray ninepatch, int density)
378{
379    return createBitmap(env, bitmap, NULL, bitmapCreateFlags, ninepatch, NULL, density);
380}
381
382void GraphicsJNI::reinitBitmap(JNIEnv* env, jobject javaBitmap, SkBitmap* bitmap,
383        bool isPremultiplied)
384{
385    env->CallVoidMethod(javaBitmap, gBitmap_reinitMethodID,
386            bitmap->width(), bitmap->height(), isPremultiplied);
387}
388
389int GraphicsJNI::getBitmapAllocationByteCount(JNIEnv* env, jobject javaBitmap)
390{
391    return env->CallIntMethod(javaBitmap, gBitmap_getAllocationByteCountMethodID);
392}
393
394jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
395{
396    SkASSERT(bitmap != NULL);
397
398    jobject obj = env->NewObject(gBitmapRegionDecoder_class,
399            gBitmapRegionDecoder_constructorMethodID,
400            reinterpret_cast<jlong>(bitmap));
401    hasException(env); // For the side effect of logging.
402    return obj;
403}
404
405jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
406{
407    SkASSERT(region != NULL);
408    jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
409                                 reinterpret_cast<jlong>(region), 0);
410    hasException(env); // For the side effect of logging.
411    return obj;
412}
413
414static JNIEnv* vm2env(JavaVM* vm)
415{
416    JNIEnv* env = NULL;
417    if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
418    {
419        SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
420        sk_throw();
421    }
422    return env;
423}
424
425///////////////////////////////////////////////////////////////////////////////
426
427AndroidPixelRef::AndroidPixelRef(JNIEnv* env, void* storage, size_t size, jbyteArray storageObj,
428        SkColorTable* ctable) : SkMallocPixelRef(storage, size, ctable, (storageObj == NULL)),
429        fWrappedPixelRef(NULL) {
430    SkASSERT(storage);
431    SkASSERT(env);
432
433    if (env->GetJavaVM(&fVM) != JNI_OK) {
434        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
435        sk_throw();
436    }
437    fStorageObj = storageObj;
438    fHasGlobalRef = false;
439    fGlobalRefCnt = 0;
440
441    // If storageObj is NULL, the memory was NOT allocated on the Java heap
442    fOnJavaHeap = (storageObj != NULL);
443
444}
445
446AndroidPixelRef::AndroidPixelRef(AndroidPixelRef& wrappedPixelRef, SkColorTable* ctable) :
447        SkMallocPixelRef(wrappedPixelRef.getAddr(), wrappedPixelRef.getSize(), ctable, false),
448        fWrappedPixelRef(wrappedPixelRef.fWrappedPixelRef ?
449            wrappedPixelRef.fWrappedPixelRef : &wrappedPixelRef)
450{
451    SkASSERT(fWrappedPixelRef);
452    SkSafeRef(fWrappedPixelRef);
453
454    // don't need to initialize these, as all the relevant logic delegates to the wrapped ref
455    fStorageObj = NULL;
456    fHasGlobalRef = false;
457    fGlobalRefCnt = 0;
458    fOnJavaHeap = false;
459}
460
461AndroidPixelRef::~AndroidPixelRef() {
462    if (fWrappedPixelRef) {
463        SkSafeUnref(fWrappedPixelRef);
464    } else if (fOnJavaHeap) {
465        JNIEnv* env = vm2env(fVM);
466
467        if (fStorageObj && fHasGlobalRef) {
468            env->DeleteGlobalRef(fStorageObj);
469        }
470        fStorageObj = NULL;
471    }
472}
473jbyteArray AndroidPixelRef::getStorageObj() {
474    if (fWrappedPixelRef) {
475        return fWrappedPixelRef->fStorageObj;
476    }
477    return fStorageObj;
478}
479
480void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
481    if (fWrappedPixelRef) {
482        // delegate java obj management to the wrapped ref
483        fWrappedPixelRef->setLocalJNIRef(arr);
484    } else if (!fHasGlobalRef) {
485        fStorageObj = arr;
486    }
487}
488
489void AndroidPixelRef::globalRef(void* localref) {
490    if (fWrappedPixelRef) {
491        // delegate java obj management to the wrapped ref
492        fWrappedPixelRef->globalRef(localref);
493
494        // Note: we only ref and unref the wrapped AndroidPixelRef so that
495        // bitmap->pixelRef()->globalRef() and globalUnref() can be used in a pair, even if
496        // the bitmap has its underlying AndroidPixelRef swapped out/wrapped
497        return;
498    }
499    if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
500        JNIEnv *env = vm2env(fVM);
501
502        // If JNI ref was passed, it is always used
503        if (localref) fStorageObj = (jbyteArray) localref;
504
505        if (fStorageObj == NULL) {
506            SkDebugf("No valid local ref to create a JNI global ref\n");
507            sk_throw();
508        }
509        if (fHasGlobalRef) {
510            // This should never happen
511            SkDebugf("Already holding a JNI global ref");
512            sk_throw();
513        }
514
515        fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
516        // TODO: Check for failure here
517        fHasGlobalRef = true;
518    }
519    ref();
520}
521
522void AndroidPixelRef::globalUnref() {
523    if (fWrappedPixelRef) {
524        // delegate java obj management to the wrapped ref
525        fWrappedPixelRef->globalUnref();
526        return;
527    }
528    if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
529        JNIEnv *env = vm2env(fVM);
530        if (!fHasGlobalRef) {
531            SkDebugf("We don't have a global ref!");
532            sk_throw();
533        }
534        env->DeleteGlobalRef(fStorageObj);
535        fStorageObj = NULL;
536        fHasGlobalRef = false;
537    }
538    unref();
539}
540
541///////////////////////////////////////////////////////////////////////////////
542
543jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
544                                             SkColorTable* ctable) {
545    Sk64 size64 = bitmap->getSize64();
546    if (size64.isNeg() || !size64.is32()) {
547        jniThrowException(env, "java/lang/IllegalArgumentException",
548                          "bitmap size exceeds 32bits");
549        return NULL;
550    }
551    size_t size = size64.get32();
552    jbyteArray arrayObj = (jbyteArray) env->CallObjectMethod(gVMRuntime,
553                                                             gVMRuntime_newNonMovableArray,
554                                                             gByte_class, size);
555    if (env->ExceptionCheck() != 0) {
556        return NULL;
557    }
558    SkASSERT(arrayObj);
559    jbyte* addr = (jbyte*) env->CallLongMethod(gVMRuntime, gVMRuntime_addressOf, arrayObj);
560    if (env->ExceptionCheck() != 0) {
561        return NULL;
562    }
563    SkASSERT(addr);
564    SkPixelRef* pr = new AndroidPixelRef(env, (void*) addr, size, arrayObj, ctable);
565    bitmap->setPixelRef(pr)->unref();
566    // since we're already allocated, we lockPixels right away
567    // HeapAllocator behaves this way too
568    bitmap->lockPixels();
569
570    return arrayObj;
571}
572
573///////////////////////////////////////////////////////////////////////////////
574
575JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
576    : fStorageObj(NULL),
577      fAllocCount(0) {
578    if (env->GetJavaVM(&fVM) != JNI_OK) {
579        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
580        sk_throw();
581    }
582}
583
584bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
585    JNIEnv* env = vm2env(fVM);
586
587    fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
588    fAllocCount += 1;
589    return fStorageObj != NULL;
590}
591
592////////////////////////////////////////////////////////////////////////////////
593
594JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
595    fEnv = env;
596    fNativeBitmap = nativeBitmap;
597    fBuffer = buffer;
598
599    // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
600    if (fBuffer) {
601        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
602    }
603}
604
605JavaHeapBitmapRef::~JavaHeapBitmapRef() {
606    if (fBuffer) {
607        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
608    }
609}
610
611////////////////////////////////////////////////////////////////////////////////
612
613static jclass make_globalref(JNIEnv* env, const char classname[])
614{
615    jclass c = env->FindClass(classname);
616    SkASSERT(c);
617    return (jclass) env->NewGlobalRef(c);
618}
619
620static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
621                                const char fieldname[], const char type[])
622{
623    jfieldID id = env->GetFieldID(clazz, fieldname, type);
624    SkASSERT(id);
625    return id;
626}
627
628int register_android_graphics_Graphics(JNIEnv* env)
629{
630    jmethodID m;
631    jclass c;
632
633    gRect_class = make_globalref(env, "android/graphics/Rect");
634    gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
635    gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
636    gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
637    gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
638
639    gRectF_class = make_globalref(env, "android/graphics/RectF");
640    gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
641    gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
642    gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
643    gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
644
645    gPoint_class = make_globalref(env, "android/graphics/Point");
646    gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
647    gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
648
649    gPointF_class = make_globalref(env, "android/graphics/PointF");
650    gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
651    gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
652
653    gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
654    gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "J");
655    gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>", "(J[BIIIZZ[B[I)V");
656    gBitmap_reinitMethodID = env->GetMethodID(gBitmap_class, "reinit", "(IIZ)V");
657    gBitmap_getAllocationByteCountMethodID = env->GetMethodID(gBitmap_class, "getAllocationByteCount", "()I");
658    gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
659    gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(J)V");
660
661    gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
662    gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
663                                                     "nativeInt", "I");
664
665    gCanvas_class = make_globalref(env, "android/graphics/Canvas");
666    gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvas", "J");
667
668    gPaint_class = make_globalref(env, "android/graphics/Paint");
669    gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "J");
670
671    gPicture_class = make_globalref(env, "android/graphics/Picture");
672    gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "J");
673
674    gRegion_class = make_globalref(env, "android/graphics/Region");
675    gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "J");
676    gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
677        "(JI)V");
678
679    c = env->FindClass("java/lang/Byte");
680    gByte_class = (jclass) env->NewGlobalRef(
681        env->GetStaticObjectField(c, env->GetStaticFieldID(c, "TYPE", "Ljava/lang/Class;")));
682
683    gVMRuntime_class = make_globalref(env, "dalvik/system/VMRuntime");
684    m = env->GetStaticMethodID(gVMRuntime_class, "getRuntime", "()Ldalvik/system/VMRuntime;");
685    gVMRuntime = env->NewGlobalRef(env->CallStaticObjectMethod(gVMRuntime_class, m));
686    gVMRuntime_newNonMovableArray = env->GetMethodID(gVMRuntime_class, "newNonMovableArray",
687                                                     "(Ljava/lang/Class;I)Ljava/lang/Object;");
688    gVMRuntime_addressOf = env->GetMethodID(gVMRuntime_class, "addressOf", "(Ljava/lang/Object;)J");
689
690    return 0;
691}
692