Graphics.cpp revision 2118b25ad422e946d4d87e191c5710bfacd7503e 
1#define LOG_TAG "GraphicsJNI"
2
3#include "jni.h"
4#include "GraphicsJNI.h"
5
6#include "SkCanvas.h"
7#include "SkDevice.h"
8#include "SkPicture.h"
9#include "SkRegion.h"
10#include <android_runtime/AndroidRuntime.h>
11
12void doThrow(JNIEnv* env, const char* exc, const char* msg) {
13    // don't throw a new exception if we already have one pending
14    if (env->ExceptionCheck() == JNI_FALSE) {
15        jclass npeClazz;
16
17        npeClazz = env->FindClass(exc);
18        LOG_FATAL_IF(npeClazz == NULL, "Unable to find class %s", exc);
19
20        env->ThrowNew(npeClazz, msg);
21    }
22}
23
24void doThrowNPE(JNIEnv* env) {
25    doThrow(env, "java/lang/NullPointerException");
26}
27
28void doThrowAIOOBE(JNIEnv* env) {
29    doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
30}
31
32void doThrowRE(JNIEnv* env, const char* msg) {
33    doThrow(env, "java/lang/RuntimeException", msg);
34}
35
36void doThrowIAE(JNIEnv* env, const char* msg) {
37    doThrow(env, "java/lang/IllegalArgumentException", msg);
38}
39
40void doThrowISE(JNIEnv* env, const char* msg) {
41    doThrow(env, "java/lang/IllegalStateException", msg);
42}
43
44void doThrowOOME(JNIEnv* env, const char* msg) {
45    doThrow(env, "java/lang/OutOfMemoryError", msg);
46}
47
48void doThrowIOE(JNIEnv* env, const char* msg) {
49    doThrow(env, "java/io/IOException", msg);
50}
51
52bool GraphicsJNI::hasException(JNIEnv *env) {
53    if (env->ExceptionCheck() != 0) {
54        LOGE("*** Uncaught exception returned from Java call!\n");
55        env->ExceptionDescribe();
56        return true;
57    }
58    return false;
59}
60
61///////////////////////////////////////////////////////////////////////////////
62
63AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
64                                       int minLength, JNIAccess access)
65: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
66    SkASSERT(env);
67    if (array) {
68        fLen = env->GetArrayLength(array);
69        if (fLen < minLength) {
70            sk_throw();
71        }
72        fPtr = env->GetFloatArrayElements(array, NULL);
73    }
74    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
75}
76
77AutoJavaFloatArray::~AutoJavaFloatArray() {
78    if (fPtr) {
79        fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
80    }
81}
82
83AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
84                                       int minLength)
85: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
86    SkASSERT(env);
87    if (array) {
88        fLen = env->GetArrayLength(array);
89        if (fLen < minLength) {
90            sk_throw();
91        }
92        fPtr = env->GetIntArrayElements(array, NULL);
93    }
94}
95
96AutoJavaIntArray::~AutoJavaIntArray() {
97    if (fPtr) {
98        fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
99    }
100}
101
102AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
103                                       int minLength, JNIAccess access)
104: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
105    SkASSERT(env);
106    if (array) {
107        fLen = env->GetArrayLength(array);
108        if (fLen < minLength) {
109            sk_throw();
110        }
111        fPtr = env->GetShortArrayElements(array, NULL);
112    }
113    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
114}
115
116AutoJavaShortArray::~AutoJavaShortArray() {
117    if (fPtr) {
118        fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
119    }
120}
121
122AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
123                                       int minLength)
124: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
125    SkASSERT(env);
126    if (array) {
127        fLen = env->GetArrayLength(array);
128        if (fLen < minLength) {
129            sk_throw();
130        }
131        fPtr = env->GetByteArrayElements(array, NULL);
132    }
133}
134
135AutoJavaByteArray::~AutoJavaByteArray() {
136    if (fPtr) {
137        fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
138    }
139}
140
141///////////////////////////////////////////////////////////////////////////////
142
143static jclass   gRect_class;
144static jfieldID gRect_leftFieldID;
145static jfieldID gRect_topFieldID;
146static jfieldID gRect_rightFieldID;
147static jfieldID gRect_bottomFieldID;
148
149static jclass   gRectF_class;
150static jfieldID gRectF_leftFieldID;
151static jfieldID gRectF_topFieldID;
152static jfieldID gRectF_rightFieldID;
153static jfieldID gRectF_bottomFieldID;
154
155static jclass   gPoint_class;
156static jfieldID gPoint_xFieldID;
157static jfieldID gPoint_yFieldID;
158
159static jclass   gPointF_class;
160static jfieldID gPointF_xFieldID;
161static jfieldID gPointF_yFieldID;
162
163static jclass   gBitmap_class;
164static jfieldID gBitmap_nativeInstanceID;
165static jmethodID gBitmap_constructorMethodID;
166
167static jclass   gBitmapConfig_class;
168static jfieldID gBitmapConfig_nativeInstanceID;
169
170static jclass   gBitmapRegionDecoder_class;
171static jmethodID gBitmapRegionDecoder_constructorMethodID;
172
173static jclass   gCanvas_class;
174static jfieldID gCanvas_nativeInstanceID;
175
176static jclass   gPaint_class;
177static jfieldID gPaint_nativeInstanceID;
178
179static jclass   gPicture_class;
180static jfieldID gPicture_nativeInstanceID;
181
182static jclass   gRegion_class;
183static jfieldID gRegion_nativeInstanceID;
184static jmethodID gRegion_constructorMethodID;
185
186///////////////////////////////////////////////////////////////////////////////
187
188void 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
198void 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
208SkIRect* 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
219void 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
229SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
230{
231    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
232
233    r->set(SkFloatToScalar(env->GetFloatField(obj, gRectF_leftFieldID)),
234           SkFloatToScalar(env->GetFloatField(obj, gRectF_topFieldID)),
235           SkFloatToScalar(env->GetFloatField(obj, gRectF_rightFieldID)),
236           SkFloatToScalar(env->GetFloatField(obj, gRectF_bottomFieldID)));
237    return r;
238}
239
240SkRect* 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
251void 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
261SkIPoint* 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
270void 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
278SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
279{
280    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
281
282    point->set(SkFloatToScalar(env->GetIntField(obj, gPointF_xFieldID)),
283               SkFloatToScalar(env->GetIntField(obj, gPointF_yFieldID)));
284    return point;
285}
286
287void 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
295SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
296    SkASSERT(env);
297    SkASSERT(bitmap);
298    SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
299    SkBitmap* b = (SkBitmap*)env->GetIntField(bitmap, gBitmap_nativeInstanceID);
300    SkASSERT(b);
301    return b;
302}
303
304SkBitmap::Config GraphicsJNI::getNativeBitmapConfig(JNIEnv* env,
305                                                    jobject jconfig) {
306    SkASSERT(env);
307    if (NULL == jconfig) {
308        return SkBitmap::kNo_Config;
309    }
310    SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
311    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
312    if (c < 0 || c >= SkBitmap::kConfigCount) {
313        c = SkBitmap::kNo_Config;
314    }
315    return static_cast<SkBitmap::Config>(c);
316}
317
318SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
319    SkASSERT(env);
320    SkASSERT(canvas);
321    SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
322    SkCanvas* c = (SkCanvas*)env->GetIntField(canvas, gCanvas_nativeInstanceID);
323    SkASSERT(c);
324    return c;
325}
326
327SkPaint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
328    SkASSERT(env);
329    SkASSERT(paint);
330    SkASSERT(env->IsInstanceOf(paint, gPaint_class));
331    SkPaint* p = (SkPaint*)env->GetIntField(paint, gPaint_nativeInstanceID);
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    SkPicture* p = (SkPicture*)env->GetIntField(picture, gPicture_nativeInstanceID);
342    SkASSERT(p);
343    return p;
344}
345
346SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
347{
348    SkASSERT(env);
349    SkASSERT(region);
350    SkASSERT(env->IsInstanceOf(region, gRegion_class));
351    SkRegion* r = (SkRegion*)env->GetIntField(region, gRegion_nativeInstanceID);
352    SkASSERT(r);
353    return r;
354}
355
356///////////////////////////////////////////////////////////////////////////////////////////
357
358jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
359                                  bool isMutable, jbyteArray ninepatch, int density)
360{
361    SkASSERT(bitmap);
362    SkASSERT(bitmap->pixelRef());
363
364    jobject obj = env->AllocObject(gBitmap_class);
365    if (obj) {
366        env->CallVoidMethod(obj, gBitmap_constructorMethodID,
367                            (jint)bitmap, buffer, isMutable, ninepatch, density);
368        if (hasException(env)) {
369            obj = NULL;
370        }
371    }
372    return obj;
373}
374
375jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, bool isMutable,
376                            jbyteArray ninepatch, int density)
377{
378    return createBitmap(env, bitmap, NULL, isMutable, ninepatch, density);
379}
380
381
382jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
383{
384    SkASSERT(bitmap != NULL);
385
386    jobject obj = env->AllocObject(gBitmapRegionDecoder_class);
387    if (hasException(env)) {
388        obj = NULL;
389        return obj;
390    }
391    if (obj) {
392        env->CallVoidMethod(obj, gBitmapRegionDecoder_constructorMethodID, (jint)bitmap);
393        if (hasException(env)) {
394            obj = NULL;
395        }
396    }
397    return obj;
398}
399
400jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
401{
402    SkASSERT(region != NULL);
403    jobject obj = env->AllocObject(gRegion_class);
404    if (obj) {
405        env->CallVoidMethod(obj, gRegion_constructorMethodID, (jint)region, 0);
406        if (hasException(env)) {
407            obj = NULL;
408        }
409    }
410    return obj;
411}
412
413static JNIEnv* vm2env(JavaVM* vm)
414{
415    JNIEnv* env = NULL;
416    if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
417    {
418        SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
419        sk_throw();
420    }
421    return env;
422}
423
424///////////////////////////////////////////////////////////////////////////////
425
426AndroidPixelRef::AndroidPixelRef(JNIEnv* env, void* storage, size_t size, jbyteArray storageObj,
427        SkColorTable* ctable) : SkMallocPixelRef(storage, size, ctable) {
428    SkASSERT(storage);
429    SkASSERT(env);
430
431    if (env->GetJavaVM(&fVM) != JNI_OK) {
432        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
433        sk_throw();
434    }
435    fStorageObj = storageObj;
436    fHasGlobalRef = false;
437    fGlobalRefCnt = 0;
438
439    // If storageObj is NULL, the memory was NOT allocated on the Java heap
440    fOnJavaHeap = (storageObj != NULL);
441
442}
443
444AndroidPixelRef::~AndroidPixelRef() {
445    if (fOnJavaHeap) {
446        JNIEnv* env = vm2env(fVM);
447
448        if (fStorageObj && fHasGlobalRef) {
449            env->DeleteGlobalRef(fStorageObj);
450        }
451        fStorageObj = NULL;
452
453        // Set this to NULL to prevent the SkMallocPixelRef destructor
454        // from freeing the memory.
455        fStorage = NULL;
456    }
457}
458
459void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
460    if (!fHasGlobalRef) {
461        fStorageObj = arr;
462    }
463}
464
465void AndroidPixelRef::globalRef(void* localref) {
466    if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
467        JNIEnv *env = vm2env(fVM);
468
469        // If JNI ref was passed, it is always used
470        if (localref) fStorageObj = (jbyteArray) localref;
471
472        if (fStorageObj == NULL) {
473            SkDebugf("No valid local ref to create a JNI global ref\n");
474            sk_throw();
475        }
476        if (fHasGlobalRef) {
477            // This should never happen
478            SkDebugf("Already holding a JNI global ref");
479            sk_throw();
480        }
481
482        fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
483        // TODO: Check for failure here
484        fHasGlobalRef = true;
485    }
486    ref();
487}
488
489void AndroidPixelRef::globalUnref() {
490    if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
491        JNIEnv *env = vm2env(fVM);
492        if (!fHasGlobalRef) {
493            SkDebugf("We don't have a global ref!");
494            sk_throw();
495        }
496        env->DeleteGlobalRef(fStorageObj);
497        fStorageObj = NULL;
498        fHasGlobalRef = false;
499    }
500    unref();
501}
502
503///////////////////////////////////////////////////////////////////////////////
504
505jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
506                                             SkColorTable* ctable) {
507    Sk64 size64 = bitmap->getSize64();
508    if (size64.isNeg() || !size64.is32()) {
509        doThrow(env, "java/lang/IllegalArgumentException",
510                     "bitmap size exceeds 32bits");
511        return NULL;
512    }
513
514    size_t size = size64.get32();
515    jbyteArray arrayObj = env->NewByteArray(size);
516    if (arrayObj) {
517        jbyte *addr = env->GetByteArrayElements(arrayObj, NULL);
518        env->ReleaseByteArrayElements(arrayObj, addr, 0);
519        if (addr) {
520            SkPixelRef* pr = new AndroidPixelRef(env, (void*) addr, size, arrayObj, ctable);
521            bitmap->setPixelRef(pr)->unref();
522            // since we're already allocated, we lockPixels right away
523            // HeapAllocator behaves this way too
524            bitmap->lockPixels();
525        }
526    }
527
528    return arrayObj;
529}
530
531///////////////////////////////////////////////////////////////////////////////
532
533JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
534    : fStorageObj(NULL),
535      fAllocCount(0) {
536    if (env->GetJavaVM(&fVM) != JNI_OK) {
537        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
538        sk_throw();
539    }
540}
541
542bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
543    JNIEnv* env = vm2env(fVM);
544
545    // If allocating in the Java heap, only allow a single object to be
546    // allocated for the lifetime of this object.
547    if (fStorageObj != NULL) {
548        SkDebugf("WARNING: One-shot allocator has already allocated (alloc count = %d)\n", fAllocCount);
549//        sk_throw();
550    }
551    fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
552    fAllocCount += 1;
553    return fStorageObj != NULL;
554}
555
556////////////////////////////////////////////////////////////////////////////////
557
558JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
559    fEnv = env;
560    fNativeBitmap = nativeBitmap;
561    fBuffer = buffer;
562
563    // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
564    if (fBuffer) {
565        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
566    }
567}
568
569JavaHeapBitmapRef::~JavaHeapBitmapRef() {
570    if (fBuffer) {
571        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
572    }
573}
574
575////////////////////////////////////////////////////////////////////////////////
576
577static jclass make_globalref(JNIEnv* env, const char classname[])
578{
579    jclass c = env->FindClass(classname);
580    SkASSERT(c);
581    return (jclass)env->NewGlobalRef(c);
582}
583
584static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
585                                const char fieldname[], const char type[])
586{
587    jfieldID id = env->GetFieldID(clazz, fieldname, type);
588    SkASSERT(id);
589    return id;
590}
591
592int register_android_graphics_Graphics(JNIEnv* env)
593{
594    jmethodID m;
595    jclass c;
596
597    gRect_class = make_globalref(env, "android/graphics/Rect");
598    gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
599    gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
600    gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
601    gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
602
603    gRectF_class = make_globalref(env, "android/graphics/RectF");
604    gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
605    gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
606    gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
607    gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
608
609    gPoint_class = make_globalref(env, "android/graphics/Point");
610    gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
611    gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
612
613    gPointF_class = make_globalref(env, "android/graphics/PointF");
614    gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
615    gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
616
617    gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
618    gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "I");
619    gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>",
620                                            "(I[BZ[BI)V");
621    gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
622    gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(I)V");
623
624    gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
625    gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
626                                                     "nativeInt", "I");
627
628    gCanvas_class = make_globalref(env, "android/graphics/Canvas");
629    gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvas", "I");
630
631    gPaint_class = make_globalref(env, "android/graphics/Paint");
632    gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "I");
633
634    gPicture_class = make_globalref(env, "android/graphics/Picture");
635    gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "I");
636
637    gRegion_class = make_globalref(env, "android/graphics/Region");
638    gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "I");
639    gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
640        "(II)V");
641
642    return 0;
643}
644