BitmapFactory.cpp revision b2fe3be4fffc9ff1bfbba0c450d64ccd6e6c4011 
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    // detach bitmap from its autodeleter, since we want to own it now
321    adb.detach();
322
323    if (willScale) {
324        // This is weird so let me explain: we could use the scale parameter
325        // directly, but for historical reasons this is how the corresponding
326        // Dalvik code has always behaved. We simply recreate the behavior here.
327        // The result is slightly different from simply using scale because of
328        // the 0.5f rounding bias applied when computing the target image size
329        const float sx = scaledWidth / float(decoded->width());
330        const float sy = scaledHeight / float(decoded->height());
331
332        bitmap->setConfig(decoded->getConfig(), scaledWidth, scaledHeight);
333        bitmap->setIsOpaque(decoded->isOpaque());
334        bitmap->allocPixels(&javaAllocator, NULL);
335        bitmap->eraseColor(0);
336
337        SkPaint paint;
338        paint.setFilterBitmap(true);
339
340        SkCanvas canvas(*bitmap);
341        canvas.scale(sx, sy);
342        canvas.drawBitmap(*decoded, 0.0f, 0.0f, &paint);
343    }
344
345    if (padding) {
346        if (peeker.fPatch != NULL) {
347            GraphicsJNI::set_jrect(env, padding,
348                    peeker.fPatch->paddingLeft, peeker.fPatch->paddingTop,
349                    peeker.fPatch->paddingRight, peeker.fPatch->paddingBottom);
350        } else {
351            GraphicsJNI::set_jrect(env, padding, -1, -1, -1, -1);
352        }
353    }
354
355    SkPixelRef* pr;
356    if (isPurgeable) {
357        pr = installPixelRef(bitmap, stream, sampleSize, doDither);
358    } else {
359        // if we get here, we're in kDecodePixels_Mode and will therefore
360        // already have a pixelref installed.
361        pr = bitmap->pixelRef();
362    }
363    if (pr == NULL) {
364        return nullObjectReturn("Got null SkPixelRef");
365    }
366
367    if (!isMutable) {
368        // promise we will never change our pixels (great for sharing and pictures)
369        pr->setImmutable();
370    }
371
372    if (javaBitmap != NULL) {
373        // If a java bitmap was passed in for reuse, pass it back
374        return javaBitmap;
375    }
376    // now create the java bitmap
377    return GraphicsJNI::createBitmap(env, bitmap, javaAllocator.getStorageObj(),
378            isMutable, ninePatchChunk, layoutBounds, -1);
379}
380
381static jobject nativeDecodeStreamScaled(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
382        jobject padding, jobject options, jboolean applyScale, jfloat scale) {
383
384    jobject bitmap = NULL;
385    SkStream* stream = CreateJavaInputStreamAdaptor(env, is, storage, 0);
386
387    if (stream) {
388        // for now we don't allow purgeable with java inputstreams
389        bitmap = doDecode(env, stream, padding, options, false, false, applyScale, scale);
390        stream->unref();
391    }
392    return bitmap;
393}
394
395static jobject nativeDecodeStream(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
396        jobject padding, jobject options) {
397
398    return nativeDecodeStreamScaled(env, clazz, is, storage, padding, options, false, 1.0f);
399}
400
401static ssize_t getFDSize(int fd) {
402    off64_t curr = ::lseek64(fd, 0, SEEK_CUR);
403    if (curr < 0) {
404        return 0;
405    }
406    size_t size = ::lseek(fd, 0, SEEK_END);
407    ::lseek64(fd, curr, SEEK_SET);
408    return size;
409}
410
411static jobject nativeDecodeFileDescriptor(JNIEnv* env, jobject clazz, jobject fileDescriptor,
412        jobject padding, jobject bitmapFactoryOptions) {
413
414    NPE_CHECK_RETURN_ZERO(env, fileDescriptor);
415
416    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
417
418    bool isPurgeable = optionsPurgeable(env, bitmapFactoryOptions);
419    bool isShareable = optionsShareable(env, bitmapFactoryOptions);
420    bool weOwnTheFD = false;
421    if (isPurgeable && isShareable) {
422        int newFD = ::dup(descriptor);
423        if (-1 != newFD) {
424            weOwnTheFD = true;
425            descriptor = newFD;
426        }
427    }
428
429    SkFDStream* stream = new SkFDStream(descriptor, weOwnTheFD);
430    SkAutoUnref aur(stream);
431    if (!stream->isValid()) {
432        return NULL;
433    }
434
435    /* Restore our offset when we leave, so we can be called more than once
436       with the same descriptor. This is only required if we didn't dup the
437       file descriptor, but it is OK to do it all the time.
438    */
439    AutoFDSeek as(descriptor);
440
441    /* Allow purgeable iff we own the FD, i.e., in the puregeable and
442       shareable case.
443    */
444    return doDecode(env, stream, padding, bitmapFactoryOptions, weOwnTheFD);
445}
446
447/*  make a deep copy of the asset, and return it as a stream, or NULL if there
448    was an error.
449 */
450static SkStream* copyAssetToStream(Asset* asset) {
451    // if we could "ref/reopen" the asset, we may not need to copy it here
452    off64_t size = asset->seek(0, SEEK_SET);
453    if ((off64_t)-1 == size) {
454        SkDebugf("---- copyAsset: asset rewind failed\n");
455        return NULL;
456    }
457
458    size = asset->getLength();
459    if (size <= 0) {
460        SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size);
461        return NULL;
462    }
463
464    SkStream* stream = new SkMemoryStream(size);
465    void* data = const_cast<void*>(stream->getMemoryBase());
466    off64_t len = asset->read(data, size);
467    if (len != size) {
468        SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len);
469        delete stream;
470        stream = NULL;
471    }
472    return stream;
473}
474
475static jobject nativeDecodeAssetScaled(JNIEnv* env, jobject clazz, jint native_asset,
476        jobject padding, jobject options, jboolean applyScale, jfloat scale) {
477
478    SkStream* stream;
479    Asset* asset = reinterpret_cast<Asset*>(native_asset);
480    bool forcePurgeable = optionsPurgeable(env, options);
481    if (forcePurgeable) {
482        // if we could "ref/reopen" the asset, we may not need to copy it here
483        // and we could assume optionsShareable, since assets are always RO
484        stream = copyAssetToStream(asset);
485        if (stream == NULL) {
486            return NULL;
487        }
488    } else {
489        // since we know we'll be done with the asset when we return, we can
490        // just use a simple wrapper
491        stream = new AssetStreamAdaptor(asset);
492    }
493    SkAutoUnref aur(stream);
494    return doDecode(env, stream, padding, options, true, forcePurgeable, applyScale, scale);
495}
496
497static jobject nativeDecodeAsset(JNIEnv* env, jobject clazz, jint native_asset,
498        jobject padding, jobject options) {
499
500    return nativeDecodeAssetScaled(env, clazz, native_asset, padding, options, false, 1.0f);
501}
502
503static jobject nativeDecodeByteArray(JNIEnv* env, jobject, jbyteArray byteArray,
504        int offset, int length, jobject options) {
505
506    /*  If optionsShareable() we could decide to just wrap the java array and
507        share it, but that means adding a globalref to the java array object
508        and managing its lifetime. For now we just always copy the array's data
509        if optionsPurgeable(), unless we're just decoding bounds.
510     */
511    bool purgeable = optionsPurgeable(env, options) && !optionsJustBounds(env, options);
512    AutoJavaByteArray ar(env, byteArray);
513    SkStream* stream = new SkMemoryStream(ar.ptr() + offset, length, purgeable);
514    SkAutoUnref aur(stream);
515    return doDecode(env, stream, NULL, options, purgeable);
516}
517
518static void nativeRequestCancel(JNIEnv*, jobject joptions) {
519    (void)AutoDecoderCancel::RequestCancel(joptions);
520}
521
522static jboolean nativeIsSeekable(JNIEnv* env, jobject, jobject fileDescriptor) {
523    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
524    return ::lseek64(descriptor, 0, SEEK_CUR) != -1 ? JNI_TRUE : JNI_FALSE;
525}
526
527///////////////////////////////////////////////////////////////////////////////
528
529static JNINativeMethod gMethods[] = {
530    {   "nativeDecodeStream",
531        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
532        (void*)nativeDecodeStream
533    },
534    {   "nativeDecodeStream",
535        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;ZF)Landroid/graphics/Bitmap;",
536        (void*)nativeDecodeStreamScaled
537    },
538
539    {   "nativeDecodeFileDescriptor",
540        "(Ljava/io/FileDescriptor;Landroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
541        (void*)nativeDecodeFileDescriptor
542    },
543
544    {   "nativeDecodeAsset",
545        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
546        (void*)nativeDecodeAsset
547    },
548
549    {   "nativeDecodeAsset",
550        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;ZF)Landroid/graphics/Bitmap;",
551        (void*)nativeDecodeAssetScaled
552    },
553
554    {   "nativeDecodeByteArray",
555        "([BIILandroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
556        (void*)nativeDecodeByteArray
557    },
558
559    {   "nativeScaleNinePatch",
560        "([BFLandroid/graphics/Rect;)[B",
561        (void*)nativeScaleNinePatch
562    },
563
564    {   "nativeIsSeekable",
565        "(Ljava/io/FileDescriptor;)Z",
566        (void*)nativeIsSeekable
567    },
568};
569
570static JNINativeMethod gOptionsMethods[] = {
571    {   "requestCancel", "()V", (void*)nativeRequestCancel }
572};
573
574static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
575                                const char fieldname[], const char type[]) {
576    jfieldID id = env->GetFieldID(clazz, fieldname, type);
577    SkASSERT(id);
578    return id;
579}
580
581int register_android_graphics_BitmapFactory(JNIEnv* env) {
582    jclass options_class = env->FindClass("android/graphics/BitmapFactory$Options");
583    SkASSERT(options_class);
584    gOptions_bitmapFieldID = getFieldIDCheck(env, options_class, "inBitmap",
585        "Landroid/graphics/Bitmap;");
586    gOptions_justBoundsFieldID = getFieldIDCheck(env, options_class, "inJustDecodeBounds", "Z");
587    gOptions_sampleSizeFieldID = getFieldIDCheck(env, options_class, "inSampleSize", "I");
588    gOptions_configFieldID = getFieldIDCheck(env, options_class, "inPreferredConfig",
589            "Landroid/graphics/Bitmap$Config;");
590    gOptions_mutableFieldID = getFieldIDCheck(env, options_class, "inMutable", "Z");
591    gOptions_ditherFieldID = getFieldIDCheck(env, options_class, "inDither", "Z");
592    gOptions_purgeableFieldID = getFieldIDCheck(env, options_class, "inPurgeable", "Z");
593    gOptions_shareableFieldID = getFieldIDCheck(env, options_class, "inInputShareable", "Z");
594    gOptions_preferQualityOverSpeedFieldID = getFieldIDCheck(env, options_class,
595            "inPreferQualityOverSpeed", "Z");
596    gOptions_widthFieldID = getFieldIDCheck(env, options_class, "outWidth", "I");
597    gOptions_heightFieldID = getFieldIDCheck(env, options_class, "outHeight", "I");
598    gOptions_mimeFieldID = getFieldIDCheck(env, options_class, "outMimeType", "Ljava/lang/String;");
599    gOptions_mCancelID = getFieldIDCheck(env, options_class, "mCancel", "Z");
600
601    jclass bitmap_class = env->FindClass("android/graphics/Bitmap");
602    SkASSERT(bitmap_class);
603    gBitmap_nativeBitmapFieldID = getFieldIDCheck(env, bitmap_class, "mNativeBitmap", "I");
604    gBitmap_layoutBoundsFieldID = getFieldIDCheck(env, bitmap_class, "mLayoutBounds", "[I");
605    int ret = AndroidRuntime::registerNativeMethods(env,
606                                    "android/graphics/BitmapFactory$Options",
607                                    gOptionsMethods,
608                                    SK_ARRAY_COUNT(gOptionsMethods));
609    if (ret) {
610        return ret;
611    }
612    return android::AndroidRuntime::registerNativeMethods(env, "android/graphics/BitmapFactory",
613                                         gMethods, SK_ARRAY_COUNT(gMethods));
614}
615