BitmapFactory.cpp revision 8f8d9fb52c65e50a32babf67ef764e173d2a5473 
1#define LOG_TAG "BitmapFactory"
2
3#include "BitmapFactory.h"
4#include "NinePatchPeeker.h"
5#include "SkImageDecoder.h"
6#include "SkImageRef_ashmem.h"
7#include "SkImageRef_GlobalPool.h"
8#include "SkPixelRef.h"
9#include "SkStream.h"
10#include "SkTemplates.h"
11#include "SkUtils.h"
12#include "CreateJavaOutputStreamAdaptor.h"
13#include "AutoDecodeCancel.h"
14#include "Utils.h"
15#include "JNIHelp.h"
16
17#include <android_runtime/AndroidRuntime.h>
18#include <androidfw/Asset.h>
19#include <androidfw/ResourceTypes.h>
20#include <netinet/in.h>
21#include <sys/mman.h>
22#include <sys/stat.h>
23
24jfieldID gOptions_justBoundsFieldID;
25jfieldID gOptions_sampleSizeFieldID;
26jfieldID gOptions_configFieldID;
27jfieldID gOptions_mutableFieldID;
28jfieldID gOptions_ditherFieldID;
29jfieldID gOptions_purgeableFieldID;
30jfieldID gOptions_shareableFieldID;
31jfieldID gOptions_preferQualityOverSpeedFieldID;
32jfieldID gOptions_widthFieldID;
33jfieldID gOptions_heightFieldID;
34jfieldID gOptions_mimeFieldID;
35jfieldID gOptions_mCancelID;
36jfieldID gOptions_bitmapFieldID;
37jfieldID gBitmap_nativeBitmapFieldID;
38jfieldID gBitmap_layoutBoundsFieldID;
39
40#if 0
41    #define TRACE_BITMAP(code)  code
42#else
43    #define TRACE_BITMAP(code)
44#endif
45
46using namespace android;
47
48static inline int32_t validOrNeg1(bool isValid, int32_t value) {
49//    return isValid ? value : -1;
50    SkASSERT((int)isValid == 0 || (int)isValid == 1);
51    return ((int32_t)isValid - 1) | value;
52}
53
54jstring getMimeTypeString(JNIEnv* env, SkImageDecoder::Format format) {
55    static const struct {
56        SkImageDecoder::Format fFormat;
57        const char*            fMimeType;
58    } gMimeTypes[] = {
59        { SkImageDecoder::kBMP_Format,  "image/bmp" },
60        { SkImageDecoder::kGIF_Format,  "image/gif" },
61        { SkImageDecoder::kICO_Format,  "image/x-ico" },
62        { SkImageDecoder::kJPEG_Format, "image/jpeg" },
63        { SkImageDecoder::kPNG_Format,  "image/png" },
64        { SkImageDecoder::kWBMP_Format, "image/vnd.wap.wbmp" }
65    };
66
67    const char* cstr = NULL;
68    for (size_t i = 0; i < SK_ARRAY_COUNT(gMimeTypes); i++) {
69        if (gMimeTypes[i].fFormat == format) {
70            cstr = gMimeTypes[i].fMimeType;
71            break;
72        }
73    }
74
75    jstring jstr = 0;
76    if (NULL != cstr) {
77        jstr = env->NewStringUTF(cstr);
78    }
79    return jstr;
80}
81
82static bool optionsPurgeable(JNIEnv* env, jobject options) {
83    return options != NULL && env->GetBooleanField(options, gOptions_purgeableFieldID);
84}
85
86static bool optionsShareable(JNIEnv* env, jobject options) {
87    return options != NULL && env->GetBooleanField(options, gOptions_shareableFieldID);
88}
89
90static bool optionsJustBounds(JNIEnv* env, jobject options) {
91    return options != NULL && env->GetBooleanField(options, gOptions_justBoundsFieldID);
92}
93
94static void scaleNinePatchChunk(android::Res_png_9patch* chunk, float scale) {
95    chunk->paddingLeft = int(chunk->paddingLeft * scale + 0.5f);
96    chunk->paddingTop = int(chunk->paddingTop * scale + 0.5f);
97    chunk->paddingRight = int(chunk->paddingRight * scale + 0.5f);
98    chunk->paddingBottom = int(chunk->paddingBottom * scale + 0.5f);
99
100    for (int i = 0; i < chunk->numXDivs; i++) {
101        chunk->xDivs[i] = int(chunk->xDivs[i] * scale + 0.5f);
102        if (i > 0 && chunk->xDivs[i] == chunk->xDivs[i - 1]) {
103            chunk->xDivs[i]++;
104        }
105    }
106
107    for (int i = 0; i < chunk->numYDivs; i++) {
108        chunk->yDivs[i] = int(chunk->yDivs[i] * scale + 0.5f);
109        if (i > 0 && chunk->yDivs[i] == chunk->yDivs[i - 1]) {
110            chunk->yDivs[i]++;
111        }
112    }
113}
114
115static jbyteArray nativeScaleNinePatch(JNIEnv* env, jobject, jbyteArray chunkObject, jfloat scale,
116        jobject padding) {
117
118    jbyte* array = env->GetByteArrayElements(chunkObject, 0);
119    if (array != NULL) {
120        size_t chunkSize = env->GetArrayLength(chunkObject);
121        void* storage = alloca(chunkSize);
122        android::Res_png_9patch* chunk = static_cast<android::Res_png_9patch*>(storage);
123        memcpy(chunk, array, chunkSize);
124        android::Res_png_9patch::deserialize(chunk);
125
126        scaleNinePatchChunk(chunk, scale);
127        memcpy(array, chunk, chunkSize);
128
129        if (padding) {
130            GraphicsJNI::set_jrect(env, padding, chunk->paddingLeft, chunk->paddingTop,
131                    chunk->paddingRight, chunk->paddingBottom);
132        }
133
134        env->ReleaseByteArrayElements(chunkObject, array, 0);
135    }
136    return chunkObject;
137}
138
139static SkPixelRef* installPixelRef(SkBitmap* bitmap, SkStream* stream,
140        int sampleSize, bool ditherImage) {
141
142    SkImageRef* pr;
143    // only use ashmem for large images, since mmaps come at a price
144    if (bitmap->getSize() >= 32 * 1024) {
145        pr = new SkImageRef_ashmem(stream, bitmap->config(), sampleSize);
146    } else {
147        pr = new SkImageRef_GlobalPool(stream, bitmap->config(), sampleSize);
148    }
149    pr->setDitherImage(ditherImage);
150    bitmap->setPixelRef(pr)->unref();
151    pr->isOpaque(bitmap);
152    return pr;
153}
154
155// since we "may" create a purgeable imageref, we require the stream be ref'able
156// i.e. dynamically allocated, since its lifetime may exceed the current stack
157// frame.
158static jobject doDecode(JNIEnv* env, SkStream* stream, jobject padding,
159        jobject options, bool allowPurgeable, bool forcePurgeable = false,
160        bool applyScale = false, float scale = 1.0f) {
161
162    int sampleSize = 1;
163
164    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
165    SkBitmap::Config prefConfig = SkBitmap::kARGB_8888_Config;
166
167    bool doDither = true;
168    bool isMutable = false;
169    bool willScale = applyScale && scale != 1.0f;
170    bool isPurgeable = !willScale &&
171            (forcePurgeable || (allowPurgeable && optionsPurgeable(env, options)));
172    bool preferQualityOverSpeed = false;
173
174    jobject javaBitmap = NULL;
175
176    if (options != NULL) {
177        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
178        if (optionsJustBounds(env, options)) {
179            mode = SkImageDecoder::kDecodeBounds_Mode;
180        }
181
182        // initialize these, in case we fail later on
183        env->SetIntField(options, gOptions_widthFieldID, -1);
184        env->SetIntField(options, gOptions_heightFieldID, -1);
185        env->SetObjectField(options, gOptions_mimeFieldID, 0);
186
187        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
188        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
189        isMutable = env->GetBooleanField(options, gOptions_mutableFieldID);
190        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
191        preferQualityOverSpeed = env->GetBooleanField(options,
192                gOptions_preferQualityOverSpeedFieldID);
193        javaBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
194    }
195
196    if (willScale && javaBitmap != NULL) {
197        return nullObjectReturn("Cannot pre-scale a reused bitmap");
198    }
199
200    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
201    if (decoder == NULL) {
202        return nullObjectReturn("SkImageDecoder::Factory returned null");
203    }
204
205    decoder->setSampleSize(sampleSize);
206    decoder->setDitherImage(doDither);
207    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
208
209    NinePatchPeeker peeker(decoder);
210    JavaPixelAllocator javaAllocator(env);
211
212    SkBitmap* bitmap;
213    if (javaBitmap == NULL) {
214        bitmap = new SkBitmap;
215    } else {
216        if (sampleSize != 1) {
217            return nullObjectReturn("SkImageDecoder: Cannot reuse bitmap with sampleSize != 1");
218        }
219        bitmap = (SkBitmap*) env->GetIntField(javaBitmap, gBitmap_nativeBitmapFieldID);
220        // config of supplied bitmap overrules config set in options
221        prefConfig = bitmap->getConfig();
222    }
223
224    SkAutoTDelete<SkImageDecoder> add(decoder);
225    SkAutoTDelete<SkBitmap> adb(bitmap, javaBitmap == NULL);
226
227    decoder->setPeeker(&peeker);
228    if (!isPurgeable) {
229        decoder->setAllocator(&javaAllocator);
230    }
231
232    AutoDecoderCancel adc(options, decoder);
233
234    // To fix the race condition in case "requestCancelDecode"
235    // happens earlier than AutoDecoderCancel object is added
236    // to the gAutoDecoderCancelMutex linked list.
237    if (options != NULL && env->GetBooleanField(options, gOptions_mCancelID)) {
238        return nullObjectReturn("gOptions_mCancelID");
239    }
240
241    SkImageDecoder::Mode decodeMode = mode;
242    if (isPurgeable) {
243        decodeMode = SkImageDecoder::kDecodeBounds_Mode;
244    }
245
246    SkBitmap* decoded;
247    if (willScale) {
248        decoded = new SkBitmap;
249    } else {
250        decoded = bitmap;
251    }
252    SkAutoTDelete<SkBitmap> adb2(willScale ? decoded : NULL);
253
254    if (!decoder->decode(stream, decoded, prefConfig, decodeMode, javaBitmap != NULL)) {
255        return nullObjectReturn("decoder->decode returned false");
256    }
257
258    int scaledWidth = decoded->width();
259    int scaledHeight = decoded->height();
260
261    if (willScale && mode != SkImageDecoder::kDecodeBounds_Mode) {
262        scaledWidth = int(scaledWidth * scale + 0.5f);
263        scaledHeight = int(scaledHeight * scale + 0.5f);
264    }
265
266    // update options (if any)
267    if (options != NULL) {
268        env->SetIntField(options, gOptions_widthFieldID, scaledWidth);
269        env->SetIntField(options, gOptions_heightFieldID, scaledHeight);
270        env->SetObjectField(options, gOptions_mimeFieldID,
271                getMimeTypeString(env, decoder->getFormat()));
272    }
273
274    // if we're in justBounds mode, return now (skip the java bitmap)
275    if (mode == SkImageDecoder::kDecodeBounds_Mode) {
276        return NULL;
277    }
278
279    jbyteArray ninePatchChunk = NULL;
280    if (peeker.fPatch != NULL) {
281        if (willScale) {
282            scaleNinePatchChunk(peeker.fPatch, scale);
283        }
284
285        size_t ninePatchArraySize = peeker.fPatch->serializedSize();
286        ninePatchChunk = env->NewByteArray(ninePatchArraySize);
287        if (ninePatchChunk == NULL) {
288            return nullObjectReturn("ninePatchChunk == null");
289        }
290
291        jbyte* array = (jbyte*) env->GetPrimitiveArrayCritical(ninePatchChunk, NULL);
292        if (array == NULL) {
293            return nullObjectReturn("primitive array == null");
294        }
295
296        peeker.fPatch->serialize(array);
297        env->ReleasePrimitiveArrayCritical(ninePatchChunk, array, 0);
298    }
299
300    jintArray layoutBounds = NULL;
301    if (peeker.fLayoutBounds != NULL) {
302        layoutBounds = env->NewIntArray(4);
303        if (layoutBounds == NULL) {
304            return nullObjectReturn("layoutBounds == null");
305        }
306
307        env->SetIntArrayRegion(layoutBounds, 0, 4, (jint*) peeker.fLayoutBounds);
308        if (javaBitmap != NULL) {
309            env->SetObjectField(javaBitmap, gBitmap_layoutBoundsFieldID, layoutBounds);
310        }
311    }
312    // detach bitmap from its autodeleter, since we want to own it now
313    adb.detach();
314
315    if (willScale) {
316        // This is weird so let me explain: we could use the scale parameter
317        // directly, but for historical reasons this is how the corresponding
318        // Dalvik code has always behaved. We simply recreate the behavior here.
319        // The result is slightly different from simply using scale because of
320        // the 0.5f rounding bias applied when computing the target image size
321        const float sx = scaledWidth / float(decoded->width());
322        const float sy = scaledHeight / float(decoded->height());
323
324        bitmap->setConfig(decoded->getConfig(), scaledWidth, scaledHeight);
325        bitmap->setIsOpaque(decoded->isOpaque());
326        bitmap->allocPixels(&javaAllocator, NULL);
327        bitmap->eraseColor(0);
328
329        SkPaint paint;
330        paint.setFilterBitmap(true);
331
332        SkCanvas canvas(*bitmap);
333        canvas.scale(sx, sy);
334        canvas.drawBitmap(*decoded, 0.0f, 0.0f, &paint);
335    }
336
337    if (padding) {
338        if (peeker.fPatch != NULL) {
339            GraphicsJNI::set_jrect(env, padding,
340                    peeker.fPatch->paddingLeft, peeker.fPatch->paddingTop,
341                    peeker.fPatch->paddingRight, peeker.fPatch->paddingBottom);
342        } else {
343            GraphicsJNI::set_jrect(env, padding, -1, -1, -1, -1);
344        }
345    }
346
347    SkPixelRef* pr;
348    if (isPurgeable) {
349        pr = installPixelRef(bitmap, stream, sampleSize, doDither);
350    } else {
351        // if we get here, we're in kDecodePixels_Mode and will therefore
352        // already have a pixelref installed.
353        pr = bitmap->pixelRef();
354    }
355
356    if (!isMutable) {
357        // promise we will never change our pixels (great for sharing and pictures)
358        pr->setImmutable();
359    }
360
361    if (javaBitmap != NULL) {
362        // If a java bitmap was passed in for reuse, pass it back
363        return javaBitmap;
364    }
365    // now create the java bitmap
366    return GraphicsJNI::createBitmap(env, bitmap, javaAllocator.getStorageObj(),
367            isMutable, ninePatchChunk, layoutBounds, -1);
368}
369
370static jobject nativeDecodeStreamScaled(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
371        jobject padding, jobject options, jboolean applyScale, jfloat scale) {
372
373    jobject bitmap = NULL;
374    SkStream* stream = CreateJavaInputStreamAdaptor(env, is, storage, 0);
375
376    if (stream) {
377        // for now we don't allow purgeable with java inputstreams
378        bitmap = doDecode(env, stream, padding, options, false, false, applyScale, scale);
379        stream->unref();
380    }
381    return bitmap;
382}
383
384static jobject nativeDecodeStream(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
385        jobject padding, jobject options) {
386
387    return nativeDecodeStreamScaled(env, clazz, is, storage, padding, options, false, 1.0f);
388}
389
390static ssize_t getFDSize(int fd) {
391    off64_t curr = ::lseek64(fd, 0, SEEK_CUR);
392    if (curr < 0) {
393        return 0;
394    }
395    size_t size = ::lseek(fd, 0, SEEK_END);
396    ::lseek64(fd, curr, SEEK_SET);
397    return size;
398}
399
400static jobject nativeDecodeFileDescriptor(JNIEnv* env, jobject clazz, jobject fileDescriptor,
401        jobject padding, jobject bitmapFactoryOptions) {
402
403    NPE_CHECK_RETURN_ZERO(env, fileDescriptor);
404
405    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
406
407    bool isPurgeable = optionsPurgeable(env, bitmapFactoryOptions);
408    bool isShareable = optionsShareable(env, bitmapFactoryOptions);
409    bool weOwnTheFD = false;
410    if (isPurgeable && isShareable) {
411        int newFD = ::dup(descriptor);
412        if (-1 != newFD) {
413            weOwnTheFD = true;
414            descriptor = newFD;
415        }
416    }
417
418    SkFDStream* stream = new SkFDStream(descriptor, weOwnTheFD);
419    SkAutoUnref aur(stream);
420    if (!stream->isValid()) {
421        return NULL;
422    }
423
424    /* Restore our offset when we leave, so we can be called more than once
425       with the same descriptor. This is only required if we didn't dup the
426       file descriptor, but it is OK to do it all the time.
427    */
428    AutoFDSeek as(descriptor);
429
430    /* Allow purgeable iff we own the FD, i.e., in the puregeable and
431       shareable case.
432    */
433    return doDecode(env, stream, padding, bitmapFactoryOptions, weOwnTheFD);
434}
435
436/*  make a deep copy of the asset, and return it as a stream, or NULL if there
437    was an error.
438 */
439static SkStream* copyAssetToStream(Asset* asset) {
440    // if we could "ref/reopen" the asset, we may not need to copy it here
441    off64_t size = asset->seek(0, SEEK_SET);
442    if ((off64_t)-1 == size) {
443        SkDebugf("---- copyAsset: asset rewind failed\n");
444        return NULL;
445    }
446
447    size = asset->getLength();
448    if (size <= 0) {
449        SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size);
450        return NULL;
451    }
452
453    SkStream* stream = new SkMemoryStream(size);
454    void* data = const_cast<void*>(stream->getMemoryBase());
455    off64_t len = asset->read(data, size);
456    if (len != size) {
457        SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len);
458        delete stream;
459        stream = NULL;
460    }
461    return stream;
462}
463
464static jobject nativeDecodeAssetScaled(JNIEnv* env, jobject clazz, jint native_asset,
465        jobject padding, jobject options, jboolean applyScale, jfloat scale) {
466
467    SkStream* stream;
468    Asset* asset = reinterpret_cast<Asset*>(native_asset);
469    bool forcePurgeable = optionsPurgeable(env, options);
470    if (forcePurgeable) {
471        // if we could "ref/reopen" the asset, we may not need to copy it here
472        // and we could assume optionsShareable, since assets are always RO
473        stream = copyAssetToStream(asset);
474        if (stream == NULL) {
475            return NULL;
476        }
477    } else {
478        // since we know we'll be done with the asset when we return, we can
479        // just use a simple wrapper
480        stream = new AssetStreamAdaptor(asset);
481    }
482    SkAutoUnref aur(stream);
483    return doDecode(env, stream, padding, options, true, forcePurgeable, applyScale, scale);
484}
485
486static jobject nativeDecodeAsset(JNIEnv* env, jobject clazz, jint native_asset,
487        jobject padding, jobject options) {
488
489    return nativeDecodeAssetScaled(env, clazz, native_asset, padding, options, false, 1.0f);
490}
491
492static jobject nativeDecodeByteArray(JNIEnv* env, jobject, jbyteArray byteArray,
493        int offset, int length, jobject options) {
494
495    /*  If optionsShareable() we could decide to just wrap the java array and
496        share it, but that means adding a globalref to the java array object
497        and managing its lifetime. For now we just always copy the array's data
498        if optionsPurgeable(), unless we're just decoding bounds.
499     */
500    bool purgeable = optionsPurgeable(env, options) && !optionsJustBounds(env, options);
501    AutoJavaByteArray ar(env, byteArray);
502    SkStream* stream = new SkMemoryStream(ar.ptr() + offset, length, purgeable);
503    SkAutoUnref aur(stream);
504    return doDecode(env, stream, NULL, options, purgeable);
505}
506
507static void nativeRequestCancel(JNIEnv*, jobject joptions) {
508    (void)AutoDecoderCancel::RequestCancel(joptions);
509}
510
511static jboolean nativeIsSeekable(JNIEnv* env, jobject, jobject fileDescriptor) {
512    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
513    return ::lseek64(descriptor, 0, SEEK_CUR) != -1 ? JNI_TRUE : JNI_FALSE;
514}
515
516///////////////////////////////////////////////////////////////////////////////
517
518static JNINativeMethod gMethods[] = {
519    {   "nativeDecodeStream",
520        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
521        (void*)nativeDecodeStream
522    },
523    {   "nativeDecodeStream",
524        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;ZF)Landroid/graphics/Bitmap;",
525        (void*)nativeDecodeStreamScaled
526    },
527
528    {   "nativeDecodeFileDescriptor",
529        "(Ljava/io/FileDescriptor;Landroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
530        (void*)nativeDecodeFileDescriptor
531    },
532
533    {   "nativeDecodeAsset",
534        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
535        (void*)nativeDecodeAsset
536    },
537
538    {   "nativeDecodeAsset",
539        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;ZF)Landroid/graphics/Bitmap;",
540        (void*)nativeDecodeAssetScaled
541    },
542
543    {   "nativeDecodeByteArray",
544        "([BIILandroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
545        (void*)nativeDecodeByteArray
546    },
547
548    {   "nativeScaleNinePatch",
549        "([BFLandroid/graphics/Rect;)[B",
550        (void*)nativeScaleNinePatch
551    },
552
553    {   "nativeIsSeekable",
554        "(Ljava/io/FileDescriptor;)Z",
555        (void*)nativeIsSeekable
556    },
557};
558
559static JNINativeMethod gOptionsMethods[] = {
560    {   "requestCancel", "()V", (void*)nativeRequestCancel }
561};
562
563static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
564                                const char fieldname[], const char type[]) {
565    jfieldID id = env->GetFieldID(clazz, fieldname, type);
566    SkASSERT(id);
567    return id;
568}
569
570int register_android_graphics_BitmapFactory(JNIEnv* env) {
571    jclass options_class = env->FindClass("android/graphics/BitmapFactory$Options");
572    SkASSERT(options_class);
573    gOptions_bitmapFieldID = getFieldIDCheck(env, options_class, "inBitmap",
574        "Landroid/graphics/Bitmap;");
575    gOptions_justBoundsFieldID = getFieldIDCheck(env, options_class, "inJustDecodeBounds", "Z");
576    gOptions_sampleSizeFieldID = getFieldIDCheck(env, options_class, "inSampleSize", "I");
577    gOptions_configFieldID = getFieldIDCheck(env, options_class, "inPreferredConfig",
578            "Landroid/graphics/Bitmap$Config;");
579    gOptions_mutableFieldID = getFieldIDCheck(env, options_class, "inMutable", "Z");
580    gOptions_ditherFieldID = getFieldIDCheck(env, options_class, "inDither", "Z");
581    gOptions_purgeableFieldID = getFieldIDCheck(env, options_class, "inPurgeable", "Z");
582    gOptions_shareableFieldID = getFieldIDCheck(env, options_class, "inInputShareable", "Z");
583    gOptions_preferQualityOverSpeedFieldID = getFieldIDCheck(env, options_class,
584            "inPreferQualityOverSpeed", "Z");
585    gOptions_widthFieldID = getFieldIDCheck(env, options_class, "outWidth", "I");
586    gOptions_heightFieldID = getFieldIDCheck(env, options_class, "outHeight", "I");
587    gOptions_mimeFieldID = getFieldIDCheck(env, options_class, "outMimeType", "Ljava/lang/String;");
588    gOptions_mCancelID = getFieldIDCheck(env, options_class, "mCancel", "Z");
589
590    jclass bitmap_class = env->FindClass("android/graphics/Bitmap");
591    SkASSERT(bitmap_class);
592    gBitmap_nativeBitmapFieldID = getFieldIDCheck(env, bitmap_class, "mNativeBitmap", "I");
593    gBitmap_layoutBoundsFieldID = getFieldIDCheck(env, bitmap_class, "mLayoutBounds", "[I");
594    int ret = AndroidRuntime::registerNativeMethods(env,
595                                    "android/graphics/BitmapFactory$Options",
596                                    gOptionsMethods,
597                                    SK_ARRAY_COUNT(gOptionsMethods));
598    if (ret) {
599        return ret;
600    }
601    return android::AndroidRuntime::registerNativeMethods(env, "android/graphics/BitmapFactory",
602                                         gMethods, SK_ARRAY_COUNT(gMethods));
603}
604