Graphics.cpp revision 69a017bc1d1649350f830dfada5c6ed5eac0b770 
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        LOGE("*** 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;
155
156static jclass   gBitmapConfig_class;
157static jfieldID gBitmapConfig_nativeInstanceID;
158
159static jclass   gBitmapRegionDecoder_class;
160static jmethodID gBitmapRegionDecoder_constructorMethodID;
161
162static jclass   gCanvas_class;
163static jfieldID gCanvas_nativeInstanceID;
164
165static jclass   gPaint_class;
166static jfieldID gPaint_nativeInstanceID;
167
168static jclass   gPicture_class;
169static jfieldID gPicture_nativeInstanceID;
170
171static jclass   gRegion_class;
172static jfieldID gRegion_nativeInstanceID;
173static jmethodID gRegion_constructorMethodID;
174
175///////////////////////////////////////////////////////////////////////////////
176
177void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
178{
179    SkASSERT(env->IsInstanceOf(obj, gRect_class));
180
181    *L = env->GetIntField(obj, gRect_leftFieldID);
182    *T = env->GetIntField(obj, gRect_topFieldID);
183    *R = env->GetIntField(obj, gRect_rightFieldID);
184    *B = env->GetIntField(obj, gRect_bottomFieldID);
185}
186
187void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
188{
189    SkASSERT(env->IsInstanceOf(obj, gRect_class));
190
191    env->SetIntField(obj, gRect_leftFieldID, L);
192    env->SetIntField(obj, gRect_topFieldID, T);
193    env->SetIntField(obj, gRect_rightFieldID, R);
194    env->SetIntField(obj, gRect_bottomFieldID, B);
195}
196
197SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
198{
199    SkASSERT(env->IsInstanceOf(obj, gRect_class));
200
201    ir->set(env->GetIntField(obj, gRect_leftFieldID),
202            env->GetIntField(obj, gRect_topFieldID),
203            env->GetIntField(obj, gRect_rightFieldID),
204            env->GetIntField(obj, gRect_bottomFieldID));
205    return ir;
206}
207
208void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
209{
210    SkASSERT(env->IsInstanceOf(obj, gRect_class));
211
212    env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
213    env->SetIntField(obj, gRect_topFieldID, ir.fTop);
214    env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
215    env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
216}
217
218SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
219{
220    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
221
222    r->set(SkFloatToScalar(env->GetFloatField(obj, gRectF_leftFieldID)),
223           SkFloatToScalar(env->GetFloatField(obj, gRectF_topFieldID)),
224           SkFloatToScalar(env->GetFloatField(obj, gRectF_rightFieldID)),
225           SkFloatToScalar(env->GetFloatField(obj, gRectF_bottomFieldID)));
226    return r;
227}
228
229SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
230{
231    SkASSERT(env->IsInstanceOf(obj, gRect_class));
232
233    r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
234           SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
235           SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
236           SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
237    return r;
238}
239
240void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
241{
242    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
243
244    env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
245    env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
246    env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
247    env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
248}
249
250SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
251{
252    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
253
254    point->set(env->GetIntField(obj, gPoint_xFieldID),
255               env->GetIntField(obj, gPoint_yFieldID));
256    return point;
257}
258
259void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
260{
261    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
262
263    env->SetIntField(obj, gPoint_xFieldID, ir.fX);
264    env->SetIntField(obj, gPoint_yFieldID, ir.fY);
265}
266
267SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
268{
269    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
270
271    point->set(SkFloatToScalar(env->GetIntField(obj, gPointF_xFieldID)),
272               SkFloatToScalar(env->GetIntField(obj, gPointF_yFieldID)));
273    return point;
274}
275
276void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
277{
278    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
279
280    env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
281    env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
282}
283
284SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
285    SkASSERT(env);
286    SkASSERT(bitmap);
287    SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
288    SkBitmap* b = (SkBitmap*)env->GetIntField(bitmap, gBitmap_nativeInstanceID);
289    SkASSERT(b);
290    return b;
291}
292
293SkBitmap::Config GraphicsJNI::getNativeBitmapConfig(JNIEnv* env,
294                                                    jobject jconfig) {
295    SkASSERT(env);
296    if (NULL == jconfig) {
297        return SkBitmap::kNo_Config;
298    }
299    SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
300    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
301    if (c < 0 || c >= SkBitmap::kConfigCount) {
302        c = SkBitmap::kNo_Config;
303    }
304    return static_cast<SkBitmap::Config>(c);
305}
306
307SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
308    SkASSERT(env);
309    SkASSERT(canvas);
310    SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
311    SkCanvas* c = (SkCanvas*)env->GetIntField(canvas, gCanvas_nativeInstanceID);
312    SkASSERT(c);
313    return c;
314}
315
316SkPaint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
317    SkASSERT(env);
318    SkASSERT(paint);
319    SkASSERT(env->IsInstanceOf(paint, gPaint_class));
320    SkPaint* p = (SkPaint*)env->GetIntField(paint, gPaint_nativeInstanceID);
321    SkASSERT(p);
322    return p;
323}
324
325SkPicture* GraphicsJNI::getNativePicture(JNIEnv* env, jobject picture)
326{
327    SkASSERT(env);
328    SkASSERT(picture);
329    SkASSERT(env->IsInstanceOf(picture, gPicture_class));
330    SkPicture* p = (SkPicture*)env->GetIntField(picture, gPicture_nativeInstanceID);
331    SkASSERT(p);
332    return p;
333}
334
335SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
336{
337    SkASSERT(env);
338    SkASSERT(region);
339    SkASSERT(env->IsInstanceOf(region, gRegion_class));
340    SkRegion* r = (SkRegion*)env->GetIntField(region, gRegion_nativeInstanceID);
341    SkASSERT(r);
342    return r;
343}
344
345///////////////////////////////////////////////////////////////////////////////////////////
346
347jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
348                                  bool isMutable, jbyteArray ninepatch, int density)
349{
350    SkASSERT(bitmap);
351    SkASSERT(bitmap->pixelRef());
352
353    jobject obj = env->AllocObject(gBitmap_class);
354    if (obj) {
355        env->CallVoidMethod(obj, gBitmap_constructorMethodID,
356                            (jint)bitmap, buffer, isMutable, ninepatch, density);
357        if (hasException(env)) {
358            obj = NULL;
359        }
360    }
361    return obj;
362}
363
364jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, bool isMutable,
365                            jbyteArray ninepatch, int density)
366{
367    return createBitmap(env, bitmap, NULL, isMutable, ninepatch, density);
368}
369
370
371jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
372{
373    SkASSERT(bitmap != NULL);
374
375    jobject obj = env->AllocObject(gBitmapRegionDecoder_class);
376    if (hasException(env)) {
377        obj = NULL;
378        return obj;
379    }
380    if (obj) {
381        env->CallVoidMethod(obj, gBitmapRegionDecoder_constructorMethodID, (jint)bitmap);
382        if (hasException(env)) {
383            obj = NULL;
384        }
385    }
386    return obj;
387}
388
389jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
390{
391    SkASSERT(region != NULL);
392    jobject obj = env->AllocObject(gRegion_class);
393    if (obj) {
394        env->CallVoidMethod(obj, gRegion_constructorMethodID, (jint)region, 0);
395        if (hasException(env)) {
396            obj = NULL;
397        }
398    }
399    return obj;
400}
401
402static JNIEnv* vm2env(JavaVM* vm)
403{
404    JNIEnv* env = NULL;
405    if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
406    {
407        SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
408        sk_throw();
409    }
410    return env;
411}
412
413///////////////////////////////////////////////////////////////////////////////
414
415AndroidPixelRef::AndroidPixelRef(JNIEnv* env, void* storage, size_t size, jbyteArray storageObj,
416        SkColorTable* ctable) : SkMallocPixelRef(storage, size, ctable) {
417    SkASSERT(storage);
418    SkASSERT(env);
419
420    if (env->GetJavaVM(&fVM) != JNI_OK) {
421        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
422        sk_throw();
423    }
424    fStorageObj = storageObj;
425    fHasGlobalRef = false;
426    fGlobalRefCnt = 0;
427
428    // If storageObj is NULL, the memory was NOT allocated on the Java heap
429    fOnJavaHeap = (storageObj != NULL);
430
431}
432
433AndroidPixelRef::~AndroidPixelRef() {
434    if (fOnJavaHeap) {
435        JNIEnv* env = vm2env(fVM);
436
437        if (fStorageObj && fHasGlobalRef) {
438            env->DeleteGlobalRef(fStorageObj);
439        }
440        fStorageObj = NULL;
441
442        // Set this to NULL to prevent the SkMallocPixelRef destructor
443        // from freeing the memory.
444        fStorage = NULL;
445    }
446}
447
448void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
449    if (!fHasGlobalRef) {
450        fStorageObj = arr;
451    }
452}
453
454void AndroidPixelRef::globalRef(void* localref) {
455    if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
456        JNIEnv *env = vm2env(fVM);
457
458        // If JNI ref was passed, it is always used
459        if (localref) fStorageObj = (jbyteArray) localref;
460
461        if (fStorageObj == NULL) {
462            SkDebugf("No valid local ref to create a JNI global ref\n");
463            sk_throw();
464        }
465        if (fHasGlobalRef) {
466            // This should never happen
467            SkDebugf("Already holding a JNI global ref");
468            sk_throw();
469        }
470
471        fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
472        // TODO: Check for failure here
473        fHasGlobalRef = true;
474    }
475    ref();
476}
477
478void AndroidPixelRef::globalUnref() {
479    if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
480        JNIEnv *env = vm2env(fVM);
481        if (!fHasGlobalRef) {
482            SkDebugf("We don't have a global ref!");
483            sk_throw();
484        }
485        env->DeleteGlobalRef(fStorageObj);
486        fStorageObj = NULL;
487        fHasGlobalRef = false;
488    }
489    unref();
490}
491
492///////////////////////////////////////////////////////////////////////////////
493
494extern "C" jbyte* jniGetNonMovableArrayElements(C_JNIEnv* env, jarray arrayObj);
495
496jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
497                                             SkColorTable* ctable) {
498    Sk64 size64 = bitmap->getSize64();
499    if (size64.isNeg() || !size64.is32()) {
500        jniThrowException(env, "java/lang/IllegalArgumentException",
501                          "bitmap size exceeds 32bits");
502        return NULL;
503    }
504
505    size_t size = size64.get32();
506    jbyteArray arrayObj = env->NewByteArray(size);
507    if (arrayObj) {
508        // TODO: make this work without jniGetNonMovableArrayElements
509        jbyte* addr = jniGetNonMovableArrayElements(&env->functions, arrayObj);
510        if (addr) {
511            SkPixelRef* pr = new AndroidPixelRef(env, (void*) addr, size, arrayObj, ctable);
512            bitmap->setPixelRef(pr)->unref();
513            // since we're already allocated, we lockPixels right away
514            // HeapAllocator behaves this way too
515            bitmap->lockPixels();
516        }
517    }
518
519    return arrayObj;
520}
521
522///////////////////////////////////////////////////////////////////////////////
523
524JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
525    : fStorageObj(NULL),
526      fAllocCount(0) {
527    if (env->GetJavaVM(&fVM) != JNI_OK) {
528        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
529        sk_throw();
530    }
531}
532
533bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
534    JNIEnv* env = vm2env(fVM);
535
536    // If allocating in the Java heap, only allow a single object to be
537    // allocated for the lifetime of this object.
538    if (fStorageObj != NULL) {
539        SkDebugf("WARNING: One-shot allocator has already allocated (alloc count = %d)\n", fAllocCount);
540//        sk_throw();
541    }
542    fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
543    fAllocCount += 1;
544    return fStorageObj != NULL;
545}
546
547////////////////////////////////////////////////////////////////////////////////
548
549JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
550    fEnv = env;
551    fNativeBitmap = nativeBitmap;
552    fBuffer = buffer;
553
554    // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
555    if (fBuffer) {
556        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
557    }
558}
559
560JavaHeapBitmapRef::~JavaHeapBitmapRef() {
561    if (fBuffer) {
562        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
563    }
564}
565
566////////////////////////////////////////////////////////////////////////////////
567
568static jclass make_globalref(JNIEnv* env, const char classname[])
569{
570    jclass c = env->FindClass(classname);
571    SkASSERT(c);
572    return (jclass)env->NewGlobalRef(c);
573}
574
575static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
576                                const char fieldname[], const char type[])
577{
578    jfieldID id = env->GetFieldID(clazz, fieldname, type);
579    SkASSERT(id);
580    return id;
581}
582
583int register_android_graphics_Graphics(JNIEnv* env)
584{
585    jmethodID m;
586    jclass c;
587
588    gRect_class = make_globalref(env, "android/graphics/Rect");
589    gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
590    gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
591    gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
592    gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
593
594    gRectF_class = make_globalref(env, "android/graphics/RectF");
595    gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
596    gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
597    gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
598    gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
599
600    gPoint_class = make_globalref(env, "android/graphics/Point");
601    gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
602    gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
603
604    gPointF_class = make_globalref(env, "android/graphics/PointF");
605    gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
606    gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
607
608    gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
609    gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "I");
610    gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>",
611                                            "(I[BZ[BI)V");
612    gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
613    gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(I)V");
614
615    gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
616    gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
617                                                     "nativeInt", "I");
618
619    gCanvas_class = make_globalref(env, "android/graphics/Canvas");
620    gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvas", "I");
621
622    gPaint_class = make_globalref(env, "android/graphics/Paint");
623    gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "I");
624
625    gPicture_class = make_globalref(env, "android/graphics/Picture");
626    gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "I");
627
628    gRegion_class = make_globalref(env, "android/graphics/Region");
629    gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "I");
630    gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
631        "(II)V");
632
633    return 0;
634}
635