BitmapFactory.cpp revision 5827cb5059ed0eec4c73adf1acbd7ee47b2c5c8f 
1#define LOG_TAG "BitmapFactory"
2
3#include "BitmapFactory.h"
4#include "NinePatchPeeker.h"
5#include "SkData.h"
6#include "SkImageDecoder.h"
7#include "SkImageRef_ashmem.h"
8#include "SkImageRef_GlobalPool.h"
9#include "SkPixelRef.h"
10#include "SkStream.h"
11#include "SkTemplates.h"
12#include "SkUtils.h"
13#include "CreateJavaOutputStreamAdaptor.h"
14#include "AutoDecodeCancel.h"
15#include "Utils.h"
16#include "JNIHelp.h"
17
18#include <android_runtime/AndroidRuntime.h>
19#include <androidfw/Asset.h>
20#include <androidfw/ResourceTypes.h>
21#include <netinet/in.h>
22#include <sys/mman.h>
23#include <sys/stat.h>
24
25jfieldID gOptions_justBoundsFieldID;
26jfieldID gOptions_sampleSizeFieldID;
27jfieldID gOptions_configFieldID;
28jfieldID gOptions_mutableFieldID;
29jfieldID gOptions_ditherFieldID;
30jfieldID gOptions_purgeableFieldID;
31jfieldID gOptions_shareableFieldID;
32jfieldID gOptions_preferQualityOverSpeedFieldID;
33jfieldID gOptions_scaledFieldID;
34jfieldID gOptions_densityFieldID;
35jfieldID gOptions_screenDensityFieldID;
36jfieldID gOptions_targetDensityFieldID;
37jfieldID gOptions_widthFieldID;
38jfieldID gOptions_heightFieldID;
39jfieldID gOptions_mimeFieldID;
40jfieldID gOptions_mCancelID;
41jfieldID gOptions_bitmapFieldID;
42jfieldID gBitmap_nativeBitmapFieldID;
43jfieldID gBitmap_layoutBoundsFieldID;
44
45#if 0
46    #define TRACE_BITMAP(code)  code
47#else
48    #define TRACE_BITMAP(code)
49#endif
50
51using namespace android;
52
53static inline int32_t validOrNeg1(bool isValid, int32_t value) {
54//    return isValid ? value : -1;
55    SkASSERT((int)isValid == 0 || (int)isValid == 1);
56    return ((int32_t)isValid - 1) | value;
57}
58
59jstring getMimeTypeString(JNIEnv* env, SkImageDecoder::Format format) {
60    static const struct {
61        SkImageDecoder::Format fFormat;
62        const char*            fMimeType;
63    } gMimeTypes[] = {
64        { SkImageDecoder::kBMP_Format,  "image/bmp" },
65        { SkImageDecoder::kGIF_Format,  "image/gif" },
66        { SkImageDecoder::kICO_Format,  "image/x-ico" },
67        { SkImageDecoder::kJPEG_Format, "image/jpeg" },
68        { SkImageDecoder::kPNG_Format,  "image/png" },
69        { SkImageDecoder::kWEBP_Format, "image/webp" },
70        { SkImageDecoder::kWBMP_Format, "image/vnd.wap.wbmp" }
71    };
72
73    const char* cstr = NULL;
74    for (size_t i = 0; i < SK_ARRAY_COUNT(gMimeTypes); i++) {
75        if (gMimeTypes[i].fFormat == format) {
76            cstr = gMimeTypes[i].fMimeType;
77            break;
78        }
79    }
80
81    jstring jstr = 0;
82    if (NULL != cstr) {
83        jstr = env->NewStringUTF(cstr);
84    }
85    return jstr;
86}
87
88static bool optionsPurgeable(JNIEnv* env, jobject options) {
89    return options != NULL && env->GetBooleanField(options, gOptions_purgeableFieldID);
90}
91
92static bool optionsShareable(JNIEnv* env, jobject options) {
93    return options != NULL && env->GetBooleanField(options, gOptions_shareableFieldID);
94}
95
96static bool optionsJustBounds(JNIEnv* env, jobject options) {
97    return options != NULL && env->GetBooleanField(options, gOptions_justBoundsFieldID);
98}
99
100static void scaleNinePatchChunk(android::Res_png_9patch* chunk, float scale) {
101    chunk->paddingLeft = int(chunk->paddingLeft * scale + 0.5f);
102    chunk->paddingTop = int(chunk->paddingTop * scale + 0.5f);
103    chunk->paddingRight = int(chunk->paddingRight * scale + 0.5f);
104    chunk->paddingBottom = int(chunk->paddingBottom * scale + 0.5f);
105
106    for (int i = 0; i < chunk->numXDivs; i++) {
107        chunk->xDivs[i] = int(chunk->xDivs[i] * scale + 0.5f);
108        if (i > 0 && chunk->xDivs[i] == chunk->xDivs[i - 1]) {
109            chunk->xDivs[i]++;
110        }
111    }
112
113    for (int i = 0; i < chunk->numYDivs; i++) {
114        chunk->yDivs[i] = int(chunk->yDivs[i] * scale + 0.5f);
115        if (i > 0 && chunk->yDivs[i] == chunk->yDivs[i - 1]) {
116            chunk->yDivs[i]++;
117        }
118    }
119}
120
121static SkPixelRef* installPixelRef(SkBitmap* bitmap, SkStream* stream,
122        int sampleSize, bool ditherImage) {
123
124    SkImageRef* pr;
125    // only use ashmem for large images, since mmaps come at a price
126    if (bitmap->getSize() >= 32 * 1024) {
127        pr = new SkImageRef_ashmem(stream, bitmap->config(), sampleSize);
128    } else {
129        pr = new SkImageRef_GlobalPool(stream, bitmap->config(), sampleSize);
130    }
131    pr->setDitherImage(ditherImage);
132    bitmap->setPixelRef(pr)->unref();
133    pr->isOpaque(bitmap);
134    return pr;
135}
136
137static SkBitmap::Config configForScaledOutput(SkBitmap::Config config) {
138    switch (config) {
139        case SkBitmap::kNo_Config:
140        case SkBitmap::kIndex8_Config:
141            return SkBitmap::kARGB_8888_Config;
142        default:
143            break;
144    }
145    return config;
146}
147
148class ScaleCheckingAllocator : public SkBitmap::HeapAllocator {
149public:
150    ScaleCheckingAllocator(float scale, int size)
151            : mScale(scale), mSize(size) {
152    }
153
154    virtual bool allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
155        // accounts for scale in final allocation, using eventual size and config
156        const int bytesPerPixel = SkBitmap::ComputeBytesPerPixel(
157                configForScaledOutput(bitmap->getConfig()));
158        const int requestedSize = bytesPerPixel *
159                int(bitmap->width() * mScale + 0.5f) *
160                int(bitmap->height() * mScale + 0.5f);
161        if (requestedSize > mSize) {
162            ALOGW("bitmap for alloc reuse (%d bytes) can't fit scaled bitmap (%d bytes)",
163                    mSize, requestedSize);
164            return false;
165        }
166        return SkBitmap::HeapAllocator::allocPixelRef(bitmap, ctable);
167    }
168private:
169    const float mScale;
170    const int mSize;
171};
172
173class RecyclingPixelAllocator : public SkBitmap::Allocator {
174public:
175    RecyclingPixelAllocator(SkPixelRef* pixelRef, unsigned int size)
176            : mPixelRef(pixelRef), mSize(size) {
177        SkSafeRef(mPixelRef);
178    }
179
180    ~RecyclingPixelAllocator() {
181        SkSafeUnref(mPixelRef);
182    }
183
184    virtual bool allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
185        if (!bitmap->getSize64().is32() || bitmap->getSize() > mSize) {
186            ALOGW("bitmap marked for reuse (%d bytes) can't fit new bitmap (%d bytes)",
187                    mSize, bitmap->getSize());
188            return false;
189        }
190        bitmap->setPixelRef(mPixelRef);
191        bitmap->lockPixels();
192        return true;
193    }
194
195private:
196    SkPixelRef* const mPixelRef;
197    const unsigned int mSize;
198};
199
200// since we "may" create a purgeable imageref, we require the stream be ref'able
201// i.e. dynamically allocated, since its lifetime may exceed the current stack
202// frame.
203static jobject doDecode(JNIEnv* env, SkStream* stream, jobject padding,
204        jobject options, bool allowPurgeable, bool forcePurgeable = false) {
205
206    int sampleSize = 1;
207
208    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
209    SkBitmap::Config prefConfig = SkBitmap::kARGB_8888_Config;
210
211    bool doDither = true;
212    bool isMutable = false;
213    float scale = 1.0f;
214    bool isPurgeable = forcePurgeable || (allowPurgeable && optionsPurgeable(env, options));
215    bool preferQualityOverSpeed = false;
216
217    jobject javaBitmap = NULL;
218
219    if (options != NULL) {
220        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
221        if (optionsJustBounds(env, options)) {
222            mode = SkImageDecoder::kDecodeBounds_Mode;
223        }
224
225        // initialize these, in case we fail later on
226        env->SetIntField(options, gOptions_widthFieldID, -1);
227        env->SetIntField(options, gOptions_heightFieldID, -1);
228        env->SetObjectField(options, gOptions_mimeFieldID, 0);
229
230        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
231        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
232        isMutable = env->GetBooleanField(options, gOptions_mutableFieldID);
233        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
234        preferQualityOverSpeed = env->GetBooleanField(options,
235                gOptions_preferQualityOverSpeedFieldID);
236        javaBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
237
238        if (env->GetBooleanField(options, gOptions_scaledFieldID)) {
239            const int density = env->GetIntField(options, gOptions_densityFieldID);
240            const int targetDensity = env->GetIntField(options, gOptions_targetDensityFieldID);
241            const int screenDensity = env->GetIntField(options, gOptions_screenDensityFieldID);
242            if (density != 0 && targetDensity != 0 && density != screenDensity) {
243                scale = (float) targetDensity / density;
244            }
245        }
246    }
247
248    const bool willScale = scale != 1.0f;
249    isPurgeable &= !willScale;
250
251    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
252    if (decoder == NULL) {
253        return nullObjectReturn("SkImageDecoder::Factory returned null");
254    }
255
256    decoder->setSampleSize(sampleSize);
257    decoder->setDitherImage(doDither);
258    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
259
260    SkBitmap* outputBitmap = NULL;
261    unsigned int existingBufferSize = 0;
262    if (javaBitmap != NULL) {
263        outputBitmap = (SkBitmap*) env->GetIntField(javaBitmap, gBitmap_nativeBitmapFieldID);
264        if (outputBitmap->isImmutable()) {
265            ALOGW("Unable to reuse an immutable bitmap as an image decoder target.");
266            javaBitmap = NULL;
267            outputBitmap = NULL;
268        } else {
269            existingBufferSize = GraphicsJNI::getBitmapAllocationByteCount(env, javaBitmap);
270        }
271    }
272
273    SkAutoTDelete<SkBitmap> adb(outputBitmap == NULL ? new SkBitmap : NULL);
274    if (outputBitmap == NULL) outputBitmap = adb.get();
275
276    NinePatchPeeker peeker(decoder);
277    decoder->setPeeker(&peeker);
278
279    SkImageDecoder::Mode decodeMode = isPurgeable ? SkImageDecoder::kDecodeBounds_Mode : mode;
280
281    JavaPixelAllocator javaAllocator(env);
282    RecyclingPixelAllocator recyclingAllocator(outputBitmap->pixelRef(), existingBufferSize);
283    ScaleCheckingAllocator scaleCheckingAllocator(scale, existingBufferSize);
284    SkBitmap::Allocator* outputAllocator = (javaBitmap != NULL) ?
285            (SkBitmap::Allocator*)&recyclingAllocator : (SkBitmap::Allocator*)&javaAllocator;
286    if (decodeMode != SkImageDecoder::kDecodeBounds_Mode) {
287        if (!willScale) {
288            decoder->setAllocator(outputAllocator);
289        } else if (javaBitmap != NULL) {
290            // check for eventual scaled bounds at allocation time, so we don't decode the bitmap
291            // only to find the scaled result too large to fit in the allocation
292            decoder->setAllocator(&scaleCheckingAllocator);
293        }
294    }
295
296    // Only setup the decoder to be deleted after its stack-based, refcounted
297    // components (allocators, peekers, etc) are declared. This prevents RefCnt
298    // asserts from firing due to the order objects are deleted from the stack.
299    SkAutoTDelete<SkImageDecoder> add(decoder);
300
301    AutoDecoderCancel adc(options, decoder);
302
303    // To fix the race condition in case "requestCancelDecode"
304    // happens earlier than AutoDecoderCancel object is added
305    // to the gAutoDecoderCancelMutex linked list.
306    if (options != NULL && env->GetBooleanField(options, gOptions_mCancelID)) {
307        return nullObjectReturn("gOptions_mCancelID");
308    }
309
310    SkBitmap decodingBitmap;
311    if (!decoder->decode(stream, &decodingBitmap, prefConfig, decodeMode)) {
312        return nullObjectReturn("decoder->decode returned false");
313    }
314
315    int scaledWidth = decodingBitmap.width();
316    int scaledHeight = decodingBitmap.height();
317
318    if (willScale && mode != SkImageDecoder::kDecodeBounds_Mode) {
319        scaledWidth = int(scaledWidth * scale + 0.5f);
320        scaledHeight = int(scaledHeight * scale + 0.5f);
321    }
322
323    // update options (if any)
324    if (options != NULL) {
325        env->SetIntField(options, gOptions_widthFieldID, scaledWidth);
326        env->SetIntField(options, gOptions_heightFieldID, scaledHeight);
327        env->SetObjectField(options, gOptions_mimeFieldID,
328                getMimeTypeString(env, decoder->getFormat()));
329    }
330
331    // if we're in justBounds mode, return now (skip the java bitmap)
332    if (mode == SkImageDecoder::kDecodeBounds_Mode) {
333        return NULL;
334    }
335
336    jbyteArray ninePatchChunk = NULL;
337    if (peeker.fPatch != NULL) {
338        if (willScale) {
339            scaleNinePatchChunk(peeker.fPatch, scale);
340        }
341
342        size_t ninePatchArraySize = peeker.fPatch->serializedSize();
343        ninePatchChunk = env->NewByteArray(ninePatchArraySize);
344        if (ninePatchChunk == NULL) {
345            return nullObjectReturn("ninePatchChunk == null");
346        }
347
348        jbyte* array = (jbyte*) env->GetPrimitiveArrayCritical(ninePatchChunk, NULL);
349        if (array == NULL) {
350            return nullObjectReturn("primitive array == null");
351        }
352
353        peeker.fPatch->serialize(array);
354        env->ReleasePrimitiveArrayCritical(ninePatchChunk, array, 0);
355    }
356
357    jintArray layoutBounds = NULL;
358    if (peeker.fLayoutBounds != NULL) {
359        layoutBounds = env->NewIntArray(4);
360        if (layoutBounds == NULL) {
361            return nullObjectReturn("layoutBounds == null");
362        }
363
364        jint scaledBounds[4];
365        if (willScale) {
366            for (int i=0; i<4; i++) {
367                scaledBounds[i] = (jint)((((jint*)peeker.fLayoutBounds)[i]*scale) + .5f);
368            }
369        } else {
370            memcpy(scaledBounds, (jint*)peeker.fLayoutBounds, sizeof(scaledBounds));
371        }
372        env->SetIntArrayRegion(layoutBounds, 0, 4, scaledBounds);
373        if (javaBitmap != NULL) {
374            env->SetObjectField(javaBitmap, gBitmap_layoutBoundsFieldID, layoutBounds);
375        }
376    }
377
378    if (willScale) {
379        // This is weird so let me explain: we could use the scale parameter
380        // directly, but for historical reasons this is how the corresponding
381        // Dalvik code has always behaved. We simply recreate the behavior here.
382        // The result is slightly different from simply using scale because of
383        // the 0.5f rounding bias applied when computing the target image size
384        const float sx = scaledWidth / float(decodingBitmap.width());
385        const float sy = scaledHeight / float(decodingBitmap.height());
386
387        // TODO: avoid copying when scaled size equals decodingBitmap size
388        SkBitmap::Config config = configForScaledOutput(decodingBitmap.config());
389        outputBitmap->setConfig(config, scaledWidth, scaledHeight);
390        outputBitmap->setIsOpaque(decodingBitmap.isOpaque());
391        if (!outputBitmap->allocPixels(outputAllocator, NULL)) {
392            return nullObjectReturn("allocation failed for scaled bitmap");
393        }
394        outputBitmap->eraseColor(0);
395
396        SkPaint paint;
397        paint.setFilterBitmap(true);
398
399        SkCanvas canvas(*outputBitmap);
400        canvas.scale(sx, sy);
401        canvas.drawBitmap(decodingBitmap, 0.0f, 0.0f, &paint);
402    } else {
403        outputBitmap->swap(decodingBitmap);
404    }
405
406    if (padding) {
407        if (peeker.fPatch != NULL) {
408            GraphicsJNI::set_jrect(env, padding,
409                    peeker.fPatch->paddingLeft, peeker.fPatch->paddingTop,
410                    peeker.fPatch->paddingRight, peeker.fPatch->paddingBottom);
411        } else {
412            GraphicsJNI::set_jrect(env, padding, -1, -1, -1, -1);
413        }
414    }
415
416    SkPixelRef* pr;
417    if (isPurgeable) {
418        pr = installPixelRef(outputBitmap, stream, sampleSize, doDither);
419    } else {
420        // if we get here, we're in kDecodePixels_Mode and will therefore
421        // already have a pixelref installed.
422        pr = outputBitmap->pixelRef();
423    }
424    if (pr == NULL) {
425        return nullObjectReturn("Got null SkPixelRef");
426    }
427
428    if (!isMutable && javaBitmap == NULL) {
429        // promise we will never change our pixels (great for sharing and pictures)
430        pr->setImmutable();
431    }
432
433    // detach bitmap from its autodeleter, since we want to own it now
434    adb.detach();
435
436    if (javaBitmap != NULL) {
437        GraphicsJNI::reinitBitmap(env, javaBitmap);
438        outputBitmap->notifyPixelsChanged();
439        // If a java bitmap was passed in for reuse, pass it back
440        return javaBitmap;
441    }
442    // now create the java bitmap
443    return GraphicsJNI::createBitmap(env, outputBitmap, javaAllocator.getStorageObj(),
444            isMutable, ninePatchChunk, layoutBounds, -1);
445}
446
447static jobject nativeDecodeStream(JNIEnv* env, jobject clazz, jobject is, jbyteArray storage,
448        jobject padding, jobject options) {
449
450    jobject bitmap = NULL;
451    SkStream* stream = CreateJavaInputStreamAdaptor(env, is, storage, 0);
452
453    if (stream) {
454        // for now we don't allow purgeable with java inputstreams
455        bitmap = doDecode(env, stream, padding, options, false, false);
456        stream->unref();
457    }
458    return bitmap;
459}
460
461static ssize_t getFDSize(int fd) {
462    off64_t curr = ::lseek64(fd, 0, SEEK_CUR);
463    if (curr < 0) {
464        return 0;
465    }
466    size_t size = ::lseek(fd, 0, SEEK_END);
467    ::lseek64(fd, curr, SEEK_SET);
468    return size;
469}
470
471static jobject nativeDecodeFileDescriptor(JNIEnv* env, jobject clazz, jobject fileDescriptor,
472        jobject padding, jobject bitmapFactoryOptions) {
473
474    NPE_CHECK_RETURN_ZERO(env, fileDescriptor);
475
476    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
477
478    struct stat fdStat;
479    if (fstat(descriptor, &fdStat) == -1) {
480        doThrowIOE(env, "broken file descriptor");
481        return nullObjectReturn("fstat return -1");
482    }
483
484    bool isPurgeable = optionsPurgeable(env, bitmapFactoryOptions);
485    bool isShareable = optionsShareable(env, bitmapFactoryOptions);
486    bool weOwnTheFD = false;
487    if (isPurgeable && isShareable) {
488        int newFD = ::dup(descriptor);
489        if (-1 != newFD) {
490            weOwnTheFD = true;
491            descriptor = newFD;
492        }
493    }
494
495    SkAutoTUnref<SkData> data(SkData::NewFromFD(descriptor));
496    SkAutoTUnref<SkMemoryStream> stream(new SkMemoryStream(data));
497
498    /* Allow purgeable iff we own the FD, i.e., in the puregeable and
499       shareable case.
500    */
501    return doDecode(env, stream, padding, bitmapFactoryOptions, weOwnTheFD);
502}
503
504/*  make a deep copy of the asset, and return it as a stream, or NULL if there
505    was an error.
506 */
507static SkStream* copyAssetToStream(Asset* asset) {
508    // if we could "ref/reopen" the asset, we may not need to copy it here
509    off64_t size = asset->seek(0, SEEK_SET);
510    if ((off64_t)-1 == size) {
511        SkDebugf("---- copyAsset: asset rewind failed\n");
512        return NULL;
513    }
514
515    size = asset->getLength();
516    if (size <= 0) {
517        SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size);
518        return NULL;
519    }
520
521    SkStream* stream = new SkMemoryStream(size);
522    void* data = const_cast<void*>(stream->getMemoryBase());
523    off64_t len = asset->read(data, size);
524    if (len != size) {
525        SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len);
526        delete stream;
527        stream = NULL;
528    }
529    return stream;
530}
531
532static jobject nativeDecodeAsset(JNIEnv* env, jobject clazz, jint native_asset,
533        jobject padding, jobject options) {
534
535    SkStream* stream;
536    Asset* asset = reinterpret_cast<Asset*>(native_asset);
537    bool forcePurgeable = optionsPurgeable(env, options);
538    if (forcePurgeable) {
539        // if we could "ref/reopen" the asset, we may not need to copy it here
540        // and we could assume optionsShareable, since assets are always RO
541        stream = copyAssetToStream(asset);
542        if (stream == NULL) {
543            return NULL;
544        }
545    } else {
546        // since we know we'll be done with the asset when we return, we can
547        // just use a simple wrapper
548        stream = new AssetStreamAdaptor(asset);
549    }
550    SkAutoUnref aur(stream);
551    return doDecode(env, stream, padding, options, true, forcePurgeable);
552}
553
554static jobject nativeDecodeByteArray(JNIEnv* env, jobject, jbyteArray byteArray,
555        int offset, int length, jobject options) {
556
557    /*  If optionsShareable() we could decide to just wrap the java array and
558        share it, but that means adding a globalref to the java array object
559        and managing its lifetime. For now we just always copy the array's data
560        if optionsPurgeable(), unless we're just decoding bounds.
561     */
562    bool purgeable = optionsPurgeable(env, options) && !optionsJustBounds(env, options);
563    AutoJavaByteArray ar(env, byteArray);
564    SkStream* stream = new SkMemoryStream(ar.ptr() + offset, length, purgeable);
565    SkAutoUnref aur(stream);
566    return doDecode(env, stream, NULL, options, purgeable);
567}
568
569static void nativeRequestCancel(JNIEnv*, jobject joptions) {
570    (void)AutoDecoderCancel::RequestCancel(joptions);
571}
572
573static jboolean nativeIsSeekable(JNIEnv* env, jobject, jobject fileDescriptor) {
574    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
575    return ::lseek64(descriptor, 0, SEEK_CUR) != -1 ? JNI_TRUE : JNI_FALSE;
576}
577
578///////////////////////////////////////////////////////////////////////////////
579
580static JNINativeMethod gMethods[] = {
581    {   "nativeDecodeStream",
582        "(Ljava/io/InputStream;[BLandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
583        (void*)nativeDecodeStream
584    },
585
586    {   "nativeDecodeFileDescriptor",
587        "(Ljava/io/FileDescriptor;Landroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
588        (void*)nativeDecodeFileDescriptor
589    },
590
591    {   "nativeDecodeAsset",
592        "(ILandroid/graphics/Rect;Landroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
593        (void*)nativeDecodeAsset
594    },
595
596    {   "nativeDecodeByteArray",
597        "([BIILandroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
598        (void*)nativeDecodeByteArray
599    },
600
601    {   "nativeIsSeekable",
602        "(Ljava/io/FileDescriptor;)Z",
603        (void*)nativeIsSeekable
604    },
605};
606
607static JNINativeMethod gOptionsMethods[] = {
608    {   "requestCancel", "()V", (void*)nativeRequestCancel }
609};
610
611static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
612                                const char fieldname[], const char type[]) {
613    jfieldID id = env->GetFieldID(clazz, fieldname, type);
614    SkASSERT(id);
615    return id;
616}
617
618int register_android_graphics_BitmapFactory(JNIEnv* env) {
619    jclass options_class = env->FindClass("android/graphics/BitmapFactory$Options");
620    SkASSERT(options_class);
621    gOptions_bitmapFieldID = getFieldIDCheck(env, options_class, "inBitmap",
622        "Landroid/graphics/Bitmap;");
623    gOptions_justBoundsFieldID = getFieldIDCheck(env, options_class, "inJustDecodeBounds", "Z");
624    gOptions_sampleSizeFieldID = getFieldIDCheck(env, options_class, "inSampleSize", "I");
625    gOptions_configFieldID = getFieldIDCheck(env, options_class, "inPreferredConfig",
626            "Landroid/graphics/Bitmap$Config;");
627    gOptions_mutableFieldID = getFieldIDCheck(env, options_class, "inMutable", "Z");
628    gOptions_ditherFieldID = getFieldIDCheck(env, options_class, "inDither", "Z");
629    gOptions_purgeableFieldID = getFieldIDCheck(env, options_class, "inPurgeable", "Z");
630    gOptions_shareableFieldID = getFieldIDCheck(env, options_class, "inInputShareable", "Z");
631    gOptions_preferQualityOverSpeedFieldID = getFieldIDCheck(env, options_class,
632            "inPreferQualityOverSpeed", "Z");
633    gOptions_scaledFieldID = getFieldIDCheck(env, options_class, "inScaled", "Z");
634    gOptions_densityFieldID = getFieldIDCheck(env, options_class, "inDensity", "I");
635    gOptions_screenDensityFieldID = getFieldIDCheck(env, options_class, "inScreenDensity", "I");
636    gOptions_targetDensityFieldID = getFieldIDCheck(env, options_class, "inTargetDensity", "I");
637    gOptions_widthFieldID = getFieldIDCheck(env, options_class, "outWidth", "I");
638    gOptions_heightFieldID = getFieldIDCheck(env, options_class, "outHeight", "I");
639    gOptions_mimeFieldID = getFieldIDCheck(env, options_class, "outMimeType", "Ljava/lang/String;");
640    gOptions_mCancelID = getFieldIDCheck(env, options_class, "mCancel", "Z");
641
642    jclass bitmap_class = env->FindClass("android/graphics/Bitmap");
643    SkASSERT(bitmap_class);
644    gBitmap_nativeBitmapFieldID = getFieldIDCheck(env, bitmap_class, "mNativeBitmap", "I");
645    gBitmap_layoutBoundsFieldID = getFieldIDCheck(env, bitmap_class, "mLayoutBounds", "[I");
646    int ret = AndroidRuntime::registerNativeMethods(env,
647                                    "android/graphics/BitmapFactory$Options",
648                                    gOptionsMethods,
649                                    SK_ARRAY_COUNT(gOptionsMethods));
650    if (ret) {
651        return ret;
652    }
653    return android::AndroidRuntime::registerNativeMethods(env, "android/graphics/BitmapFactory",
654                                         gMethods, SK_ARRAY_COUNT(gMethods));
655}
656