BitmapFactory.cpp revision 27d83834143c117cbc0d06147c4374553f26b683 
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        jint scaledBounds[4];
308        if (willScale) {
309            for (int i=0; i<4; i++) {
310                scaledBounds[i] = (jint)((((jint*)peeker.fLayoutBounds)[i]*scale) + .5f);
311            }
312        } else {
313            memcpy(scaledBounds, (jint*)peeker.fLayoutBounds, sizeof(scaledBounds));
314        }
315        env->SetIntArrayRegion(layoutBounds, 0, 4, scaledBounds);
316        if (javaBitmap != NULL) {
317            env->SetObjectField(javaBitmap, gBitmap_layoutBoundsFieldID, layoutBounds);
318        }
319    }
320
321    if (willScale) {
322        // This is weird so let me explain: we could use the scale parameter
323        // directly, but for historical reasons this is how the corresponding
324        // Dalvik code has always behaved. We simply recreate the behavior here.
325        // The result is slightly different from simply using scale because of
326        // the 0.5f rounding bias applied when computing the target image size
327        const float sx = scaledWidth / float(decoded->width());
328        const float sy = scaledHeight / float(decoded->height());
329
330        bitmap->setConfig(decoded->getConfig(), scaledWidth, scaledHeight);
331        bitmap->setIsOpaque(decoded->isOpaque());
332        bitmap->allocPixels(&javaAllocator, NULL);
333        bitmap->eraseColor(0);
334
335        SkPaint paint;
336        paint.setFilterBitmap(true);
337
338        SkCanvas canvas(*bitmap);
339        canvas.scale(sx, sy);
340        canvas.drawBitmap(*decoded, 0.0f, 0.0f, &paint);
341    }
342
343    if (padding) {
344        if (peeker.fPatch != NULL) {
345            GraphicsJNI::set_jrect(env, padding,
346                    peeker.fPatch->paddingLeft, peeker.fPatch->paddingTop,
347                    peeker.fPatch->paddingRight, peeker.fPatch->paddingBottom);
348        } else {
349            GraphicsJNI::set_jrect(env, padding, -1, -1, -1, -1);
350        }
351    }
352
353    SkPixelRef* pr;
354    if (isPurgeable) {
355        pr = installPixelRef(bitmap, stream, sampleSize, doDither);
356    } else {
357        // if we get here, we're in kDecodePixels_Mode and will therefore
358        // already have a pixelref installed.
359        pr = bitmap->pixelRef();
360    }
361    if (pr == NULL) {
362        return nullObjectReturn("Got null SkPixelRef");
363    }
364
365    if (!isMutable) {
366        // promise we will never change our pixels (great for sharing and pictures)
367        pr->setImmutable();
368    }
369
370    // detach bitmap from its autodeleter, since we want to own it now
371    adb.detach();
372
373    if (javaBitmap != NULL) {
374        // If a java bitmap was passed in for reuse, pass it back
375        return javaBitmap;
376    }
377    // now create the java bitmap
378    return GraphicsJNI::createBitmap(env, bitmap, javaAllocator.getStorageObj(),
379            isMutable, ninePatchChunk, layoutBounds, -1);
380}
381
382static jobject nativeDecodeStreamScaled(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
383        jobject padding, jobject options, jboolean applyScale, jfloat scale) {
384
385    jobject bitmap = NULL;
386    SkStream* stream = CreateJavaInputStreamAdaptor(env, is, storage, 0);
387
388    if (stream) {
389        // for now we don't allow purgeable with java inputstreams
390        bitmap = doDecode(env, stream, padding, options, false, false, applyScale, scale);
391        stream->unref();
392    }
393    return bitmap;
394}
395
396static jobject nativeDecodeStream(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
397        jobject padding, jobject options) {
398
399    return nativeDecodeStreamScaled(env, clazz, is, storage, padding, options, false, 1.0f);
400}
401
402static ssize_t getFDSize(int fd) {
403    off64_t curr = ::lseek64(fd, 0, SEEK_CUR);
404    if (curr < 0) {
405        return 0;
406    }
407    size_t size = ::lseek(fd, 0, SEEK_END);
408    ::lseek64(fd, curr, SEEK_SET);
409    return size;
410}
411
412static jobject nativeDecodeFileDescriptor(JNIEnv* env, jobject clazz, jobject fileDescriptor,
413        jobject padding, jobject bitmapFactoryOptions) {
414
415    NPE_CHECK_RETURN_ZERO(env, fileDescriptor);
416
417    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
418
419    bool isPurgeable = optionsPurgeable(env, bitmapFactoryOptions);
420    bool isShareable = optionsShareable(env, bitmapFactoryOptions);
421    bool weOwnTheFD = false;
422    if (isPurgeable && isShareable) {
423        int newFD = ::dup(descriptor);
424        if (-1 != newFD) {
425            weOwnTheFD = true;
426            descriptor = newFD;
427        }
428    }
429
430    SkFDStream* stream = new SkFDStream(descriptor, weOwnTheFD);
431    SkAutoUnref aur(stream);
432    if (!stream->isValid()) {
433        return NULL;
434    }
435
436    /* Restore our offset when we leave, so we can be called more than once
437       with the same descriptor. This is only required if we didn't dup the
438       file descriptor, but it is OK to do it all the time.
439    */
440    AutoFDSeek as(descriptor);
441
442    /* Allow purgeable iff we own the FD, i.e., in the puregeable and
443       shareable case.
444    */
445    return doDecode(env, stream, padding, bitmapFactoryOptions, weOwnTheFD);
446}
447
448/*  make a deep copy of the asset, and return it as a stream, or NULL if there
449    was an error.
450 */
451static SkStream* copyAssetToStream(Asset* asset) {
452    // if we could "ref/reopen" the asset, we may not need to copy it here
453    off64_t size = asset->seek(0, SEEK_SET);
454    if ((off64_t)-1 == size) {
455        SkDebugf("---- copyAsset: asset rewind failed\n");
456        return NULL;
457    }
458
459    size = asset->getLength();
460    if (size <= 0) {
461        SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size);
462        return NULL;
463    }
464
465    SkStream* stream = new SkMemoryStream(size);
466    void* data = const_cast<void*>(stream->getMemoryBase());
467    off64_t len = asset->read(data, size);
468    if (len != size) {
469        SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len);
470        delete stream;
471        stream = NULL;
472    }
473    return stream;
474}
475
476static jobject nativeDecodeAssetScaled(JNIEnv* env, jobject clazz, jint native_asset,
477        jobject padding, jobject options, jboolean applyScale, jfloat scale) {
478
479    SkStream* stream;
480    Asset* asset = reinterpret_cast<Asset*>(native_asset);
481    bool forcePurgeable = optionsPurgeable(env, options);
482    if (forcePurgeable) {
483        // if we could "ref/reopen" the asset, we may not need to copy it here
484        // and we could assume optionsShareable, since assets are always RO
485        stream = copyAssetToStream(asset);
486        if (stream == NULL) {
487            return NULL;
488        }
489    } else {
490        // since we know we'll be done with the asset when we return, we can
491        // just use a simple wrapper
492        stream = new AssetStreamAdaptor(asset);
493    }
494    SkAutoUnref aur(stream);
495    return doDecode(env, stream, padding, options, true, forcePurgeable, applyScale, scale);
496}
497
498static jobject nativeDecodeAsset(JNIEnv* env, jobject clazz, jint native_asset,
499        jobject padding, jobject options) {
500
501    return nativeDecodeAssetScaled(env, clazz, native_asset, padding, options, false, 1.0f);
502}
503
504static jobject nativeDecodeByteArray(JNIEnv* env, jobject, jbyteArray byteArray,
505        int offset, int length, jobject options) {
506
507    /*  If optionsShareable() we could decide to just wrap the java array and
508        share it, but that means adding a globalref to the java array object
509        and managing its lifetime. For now we just always copy the array's data
510        if optionsPurgeable(), unless we're just decoding bounds.
511     */
512    bool purgeable = optionsPurgeable(env, options) && !optionsJustBounds(env, options);
513    AutoJavaByteArray ar(env, byteArray);
514    SkStream* stream = new SkMemoryStream(ar.ptr() + offset, length, purgeable);
515    SkAutoUnref aur(stream);
516    return doDecode(env, stream, NULL, options, purgeable);
517}
518
519static void nativeRequestCancel(JNIEnv*, jobject joptions) {
520    (void)AutoDecoderCancel::RequestCancel(joptions);
521}
522
523static jboolean nativeIsSeekable(JNIEnv* env, jobject, jobject fileDescriptor) {
524    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
525    return ::lseek64(descriptor, 0, SEEK_CUR) != -1 ? JNI_TRUE : JNI_FALSE;
526}
527
528///////////////////////////////////////////////////////////////////////////////
529
530static JNINativeMethod gMethods[] = {
531    {   "nativeDecodeStream",
532        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
533        (void*)nativeDecodeStream
534    },
535    {   "nativeDecodeStream",
536        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;ZF)Landroid/graphics/Bitmap;",
537        (void*)nativeDecodeStreamScaled
538    },
539
540    {   "nativeDecodeFileDescriptor",
541        "(Ljava/io/FileDescriptor;Landroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
542        (void*)nativeDecodeFileDescriptor
543    },
544
545    {   "nativeDecodeAsset",
546        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
547        (void*)nativeDecodeAsset
548    },
549
550    {   "nativeDecodeAsset",
551        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;ZF)Landroid/graphics/Bitmap;",
552        (void*)nativeDecodeAssetScaled
553    },
554
555    {   "nativeDecodeByteArray",
556        "([BIILandroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
557        (void*)nativeDecodeByteArray
558    },
559
560    {   "nativeScaleNinePatch",
561        "([BFLandroid/graphics/Rect;)[B",
562        (void*)nativeScaleNinePatch
563    },
564
565    {   "nativeIsSeekable",
566        "(Ljava/io/FileDescriptor;)Z",
567        (void*)nativeIsSeekable
568    },
569};
570
571static JNINativeMethod gOptionsMethods[] = {
572    {   "requestCancel", "()V", (void*)nativeRequestCancel }
573};
574
575static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
576                                const char fieldname[], const char type[]) {
577    jfieldID id = env->GetFieldID(clazz, fieldname, type);
578    SkASSERT(id);
579    return id;
580}
581
582int register_android_graphics_BitmapFactory(JNIEnv* env) {
583    jclass options_class = env->FindClass("android/graphics/BitmapFactory$Options");
584    SkASSERT(options_class);
585    gOptions_bitmapFieldID = getFieldIDCheck(env, options_class, "inBitmap",
586        "Landroid/graphics/Bitmap;");
587    gOptions_justBoundsFieldID = getFieldIDCheck(env, options_class, "inJustDecodeBounds", "Z");
588    gOptions_sampleSizeFieldID = getFieldIDCheck(env, options_class, "inSampleSize", "I");
589    gOptions_configFieldID = getFieldIDCheck(env, options_class, "inPreferredConfig",
590            "Landroid/graphics/Bitmap$Config;");
591    gOptions_mutableFieldID = getFieldIDCheck(env, options_class, "inMutable", "Z");
592    gOptions_ditherFieldID = getFieldIDCheck(env, options_class, "inDither", "Z");
593    gOptions_purgeableFieldID = getFieldIDCheck(env, options_class, "inPurgeable", "Z");
594    gOptions_shareableFieldID = getFieldIDCheck(env, options_class, "inInputShareable", "Z");
595    gOptions_preferQualityOverSpeedFieldID = getFieldIDCheck(env, options_class,
596            "inPreferQualityOverSpeed", "Z");
597    gOptions_widthFieldID = getFieldIDCheck(env, options_class, "outWidth", "I");
598    gOptions_heightFieldID = getFieldIDCheck(env, options_class, "outHeight", "I");
599    gOptions_mimeFieldID = getFieldIDCheck(env, options_class, "outMimeType", "Ljava/lang/String;");
600    gOptions_mCancelID = getFieldIDCheck(env, options_class, "mCancel", "Z");
601
602    jclass bitmap_class = env->FindClass("android/graphics/Bitmap");
603    SkASSERT(bitmap_class);
604    gBitmap_nativeBitmapFieldID = getFieldIDCheck(env, bitmap_class, "mNativeBitmap", "I");
605    gBitmap_layoutBoundsFieldID = getFieldIDCheck(env, bitmap_class, "mLayoutBounds", "[I");
606    int ret = AndroidRuntime::registerNativeMethods(env,
607                                    "android/graphics/BitmapFactory$Options",
608                                    gOptionsMethods,
609                                    SK_ARRAY_COUNT(gOptionsMethods));
610    if (ret) {
611        return ret;
612    }
613    return android::AndroidRuntime::registerNativeMethods(env, "android/graphics/BitmapFactory",
614                                         gMethods, SK_ARRAY_COUNT(gMethods));
615}
616