Graphics.cpp revision 9505a6552764461c22ce48f1ac13d025d23e1579 
1#define LOG_TAG "GraphicsJNI"
2
3#include <unistd.h>
4#include <sys/mman.h>
5
6#include "jni.h"
7#include "JNIHelp.h"
8#include "GraphicsJNI.h"
9
10#include "SkCanvas.h"
11#include "SkDevice.h"
12#include "SkMath.h"
13#include "SkRegion.h"
14#include <android_runtime/AndroidRuntime.h>
15#include <cutils/ashmem.h>
16#include <hwui/Canvas.h>
17
18#include <Caches.h>
19#include <TextureCache.h>
20
21void doThrowNPE(JNIEnv* env) {
22    jniThrowNullPointerException(env, NULL);
23}
24
25void doThrowAIOOBE(JNIEnv* env) {
26    jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
27}
28
29void doThrowRE(JNIEnv* env, const char* msg) {
30    jniThrowRuntimeException(env, msg);
31}
32
33void doThrowIAE(JNIEnv* env, const char* msg) {
34    jniThrowException(env, "java/lang/IllegalArgumentException", msg);
35}
36
37void doThrowISE(JNIEnv* env, const char* msg) {
38    jniThrowException(env, "java/lang/IllegalStateException", msg);
39}
40
41void doThrowOOME(JNIEnv* env, const char* msg) {
42    jniThrowException(env, "java/lang/OutOfMemoryError", msg);
43}
44
45void doThrowIOE(JNIEnv* env, const char* msg) {
46    jniThrowException(env, "java/io/IOException", msg);
47}
48
49bool GraphicsJNI::hasException(JNIEnv *env) {
50    if (env->ExceptionCheck() != 0) {
51        ALOGE("*** Uncaught exception returned from Java call!\n");
52        env->ExceptionDescribe();
53        return true;
54    }
55    return false;
56}
57
58///////////////////////////////////////////////////////////////////////////////
59
60AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
61                                       int minLength, JNIAccess access)
62: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
63    SkASSERT(env);
64    if (array) {
65        fLen = env->GetArrayLength(array);
66        if (fLen < minLength) {
67            sk_throw();
68        }
69        fPtr = env->GetFloatArrayElements(array, NULL);
70    }
71    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
72}
73
74AutoJavaFloatArray::~AutoJavaFloatArray() {
75    if (fPtr) {
76        fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
77    }
78}
79
80AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
81                                       int minLength)
82: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
83    SkASSERT(env);
84    if (array) {
85        fLen = env->GetArrayLength(array);
86        if (fLen < minLength) {
87            sk_throw();
88        }
89        fPtr = env->GetIntArrayElements(array, NULL);
90    }
91}
92
93AutoJavaIntArray::~AutoJavaIntArray() {
94    if (fPtr) {
95        fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
96    }
97}
98
99AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
100                                       int minLength, JNIAccess access)
101: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
102    SkASSERT(env);
103    if (array) {
104        fLen = env->GetArrayLength(array);
105        if (fLen < minLength) {
106            sk_throw();
107        }
108        fPtr = env->GetShortArrayElements(array, NULL);
109    }
110    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
111}
112
113AutoJavaShortArray::~AutoJavaShortArray() {
114    if (fPtr) {
115        fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
116    }
117}
118
119AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
120                                       int minLength)
121: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
122    SkASSERT(env);
123    if (array) {
124        fLen = env->GetArrayLength(array);
125        if (fLen < minLength) {
126            sk_throw();
127        }
128        fPtr = env->GetByteArrayElements(array, NULL);
129    }
130}
131
132AutoJavaByteArray::~AutoJavaByteArray() {
133    if (fPtr) {
134        fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
135    }
136}
137
138///////////////////////////////////////////////////////////////////////////////
139
140static jclass   gRect_class;
141static jfieldID gRect_leftFieldID;
142static jfieldID gRect_topFieldID;
143static jfieldID gRect_rightFieldID;
144static jfieldID gRect_bottomFieldID;
145
146static jclass   gRectF_class;
147static jfieldID gRectF_leftFieldID;
148static jfieldID gRectF_topFieldID;
149static jfieldID gRectF_rightFieldID;
150static jfieldID gRectF_bottomFieldID;
151
152static jclass   gPoint_class;
153static jfieldID gPoint_xFieldID;
154static jfieldID gPoint_yFieldID;
155
156static jclass   gPointF_class;
157static jfieldID gPointF_xFieldID;
158static jfieldID gPointF_yFieldID;
159
160static jclass   gBitmapConfig_class;
161static jfieldID gBitmapConfig_nativeInstanceID;
162
163static jclass   gBitmapRegionDecoder_class;
164static jmethodID gBitmapRegionDecoder_constructorMethodID;
165
166static jclass   gCanvas_class;
167static jfieldID gCanvas_nativeInstanceID;
168
169static jclass   gPicture_class;
170static jfieldID gPicture_nativeInstanceID;
171
172static jclass   gRegion_class;
173static jfieldID gRegion_nativeInstanceID;
174static jmethodID gRegion_constructorMethodID;
175
176static jclass    gByte_class;
177static jobject   gVMRuntime;
178static jclass    gVMRuntime_class;
179static jmethodID gVMRuntime_newNonMovableArray;
180static jmethodID gVMRuntime_addressOf;
181
182///////////////////////////////////////////////////////////////////////////////
183
184void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
185{
186    SkASSERT(env->IsInstanceOf(obj, gRect_class));
187
188    *L = env->GetIntField(obj, gRect_leftFieldID);
189    *T = env->GetIntField(obj, gRect_topFieldID);
190    *R = env->GetIntField(obj, gRect_rightFieldID);
191    *B = env->GetIntField(obj, gRect_bottomFieldID);
192}
193
194void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
195{
196    SkASSERT(env->IsInstanceOf(obj, gRect_class));
197
198    env->SetIntField(obj, gRect_leftFieldID, L);
199    env->SetIntField(obj, gRect_topFieldID, T);
200    env->SetIntField(obj, gRect_rightFieldID, R);
201    env->SetIntField(obj, gRect_bottomFieldID, B);
202}
203
204SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
205{
206    SkASSERT(env->IsInstanceOf(obj, gRect_class));
207
208    ir->set(env->GetIntField(obj, gRect_leftFieldID),
209            env->GetIntField(obj, gRect_topFieldID),
210            env->GetIntField(obj, gRect_rightFieldID),
211            env->GetIntField(obj, gRect_bottomFieldID));
212    return ir;
213}
214
215void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
216{
217    SkASSERT(env->IsInstanceOf(obj, gRect_class));
218
219    env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
220    env->SetIntField(obj, gRect_topFieldID, ir.fTop);
221    env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
222    env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
223}
224
225SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
226{
227    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
228
229    r->set(env->GetFloatField(obj, gRectF_leftFieldID),
230           env->GetFloatField(obj, gRectF_topFieldID),
231           env->GetFloatField(obj, gRectF_rightFieldID),
232           env->GetFloatField(obj, gRectF_bottomFieldID));
233    return r;
234}
235
236SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
237{
238    SkASSERT(env->IsInstanceOf(obj, gRect_class));
239
240    r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
241           SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
242           SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
243           SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
244    return r;
245}
246
247void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
248{
249    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
250
251    env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
252    env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
253    env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
254    env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
255}
256
257SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
258{
259    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
260
261    point->set(env->GetIntField(obj, gPoint_xFieldID),
262               env->GetIntField(obj, gPoint_yFieldID));
263    return point;
264}
265
266void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
267{
268    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
269
270    env->SetIntField(obj, gPoint_xFieldID, ir.fX);
271    env->SetIntField(obj, gPoint_yFieldID, ir.fY);
272}
273
274SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
275{
276    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
277
278    point->set(env->GetIntField(obj, gPointF_xFieldID),
279               env->GetIntField(obj, gPointF_yFieldID));
280    return point;
281}
282
283void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
284{
285    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
286
287    env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
288    env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
289}
290
291// This enum must keep these int values, to match the int values
292// in the java Bitmap.Config enum.
293enum LegacyBitmapConfig {
294    kNo_LegacyBitmapConfig          = 0,
295    kA8_LegacyBitmapConfig          = 1,
296    kIndex8_LegacyBitmapConfig      = 2,
297    kRGB_565_LegacyBitmapConfig     = 3,
298    kARGB_4444_LegacyBitmapConfig   = 4,
299    kARGB_8888_LegacyBitmapConfig   = 5,
300    kRGBA_16F_LegacyBitmapConfig    = 6,
301    kHardware_LegacyBitmapConfig    = 7,
302
303    kLastEnum_LegacyBitmapConfig = kHardware_LegacyBitmapConfig
304};
305
306jint GraphicsJNI::colorTypeToLegacyBitmapConfig(SkColorType colorType) {
307    switch (colorType) {
308        case kRGBA_F16_SkColorType:
309            return kRGBA_16F_LegacyBitmapConfig;
310        case kN32_SkColorType:
311            return kARGB_8888_LegacyBitmapConfig;
312        case kARGB_4444_SkColorType:
313            return kARGB_4444_LegacyBitmapConfig;
314        case kRGB_565_SkColorType:
315            return kRGB_565_LegacyBitmapConfig;
316        case kIndex_8_SkColorType:
317            return kIndex8_LegacyBitmapConfig;
318        case kAlpha_8_SkColorType:
319            return kA8_LegacyBitmapConfig;
320        case kUnknown_SkColorType:
321        default:
322            break;
323    }
324    return kNo_LegacyBitmapConfig;
325}
326
327SkColorType GraphicsJNI::legacyBitmapConfigToColorType(jint legacyConfig) {
328    const uint8_t gConfig2ColorType[] = {
329        kUnknown_SkColorType,
330        kAlpha_8_SkColorType,
331        kIndex_8_SkColorType,
332        kRGB_565_SkColorType,
333        kARGB_4444_SkColorType,
334        kN32_SkColorType,
335        kRGBA_F16_SkColorType,
336        kN32_SkColorType
337    };
338
339    if (legacyConfig < 0 || legacyConfig > kLastEnum_LegacyBitmapConfig) {
340        legacyConfig = kNo_LegacyBitmapConfig;
341    }
342    return static_cast<SkColorType>(gConfig2ColorType[legacyConfig]);
343}
344
345void GraphicsJNI::getSkBitmap(JNIEnv* env, jobject bitmap, SkBitmap* outBitmap) {
346    android::bitmap::toBitmap(env, bitmap).getSkBitmap(outBitmap);
347}
348
349SkPixelRef* GraphicsJNI::refSkPixelRef(JNIEnv* env, jobject jbitmap) {
350    android::Bitmap& bitmap = android::bitmap::toBitmap(env, jbitmap);
351    bitmap.ref();
352    return &bitmap;
353}
354SkColorType GraphicsJNI::getNativeBitmapColorType(JNIEnv* env, jobject jconfig) {
355    SkASSERT(env);
356    if (NULL == jconfig) {
357        return kUnknown_SkColorType;
358    }
359    SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
360    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
361    return legacyBitmapConfigToColorType(c);
362}
363
364bool GraphicsJNI::isHardwareConfig(JNIEnv* env, jobject jconfig) {
365    SkASSERT(env);
366    if (NULL == jconfig) {
367        return false;
368    }
369    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
370    return c == kHardware_LegacyBitmapConfig;
371}
372
373jint GraphicsJNI::hardwareLegacyBitmapConfig() {
374    return kHardware_LegacyBitmapConfig;
375}
376
377android::Canvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
378    SkASSERT(env);
379    SkASSERT(canvas);
380    SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
381    jlong canvasHandle = env->GetLongField(canvas, gCanvas_nativeInstanceID);
382    if (!canvasHandle) {
383        return NULL;
384    }
385    return reinterpret_cast<android::Canvas*>(canvasHandle);
386}
387
388SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
389{
390    SkASSERT(env);
391    SkASSERT(region);
392    SkASSERT(env->IsInstanceOf(region, gRegion_class));
393    jlong regionHandle = env->GetLongField(region, gRegion_nativeInstanceID);
394    SkRegion* r = reinterpret_cast<SkRegion*>(regionHandle);
395    SkASSERT(r);
396    return r;
397}
398
399///////////////////////////////////////////////////////////////////////////////////////////
400
401jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
402{
403    SkASSERT(bitmap != NULL);
404
405    jobject obj = env->NewObject(gBitmapRegionDecoder_class,
406            gBitmapRegionDecoder_constructorMethodID,
407            reinterpret_cast<jlong>(bitmap));
408    hasException(env); // For the side effect of logging.
409    return obj;
410}
411
412jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
413{
414    SkASSERT(region != NULL);
415    jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
416                                 reinterpret_cast<jlong>(region), 0);
417    hasException(env); // For the side effect of logging.
418    return obj;
419}
420
421///////////////////////////////////////////////////////////////////////////////
422
423android::Bitmap* GraphicsJNI::mapAshmemBitmap(JNIEnv* env, SkBitmap* bitmap,
424        SkColorTable* ctable, int fd, void* addr, size_t size, bool readOnly) {
425    const SkImageInfo& info = bitmap->info();
426    if (info.colorType() == kUnknown_SkColorType) {
427        doThrowIAE(env, "unknown bitmap configuration");
428        return nullptr;
429    }
430
431    if (!addr) {
432        // Map existing ashmem region if not already mapped.
433        int flags = readOnly ? (PROT_READ) : (PROT_READ | PROT_WRITE);
434        size = ashmem_get_size_region(fd);
435        addr = mmap(NULL, size, flags, MAP_SHARED, fd, 0);
436        if (addr == MAP_FAILED) {
437            return nullptr;
438        }
439    }
440
441    // we must respect the rowBytes value already set on the bitmap instead of
442    // attempting to compute our own.
443    const size_t rowBytes = bitmap->rowBytes();
444
445    auto wrapper = new android::Bitmap(addr, fd, size, info, rowBytes, ctable);
446    wrapper->getSkBitmap(bitmap);
447    if (readOnly) {
448        bitmap->pixelRef()->setImmutable();
449    }
450    // since we're already allocated, we lockPixels right away
451    // HeapAllocator behaves this way too
452    bitmap->lockPixels();
453
454    return wrapper;
455}
456
457sk_sp<SkColorSpace> GraphicsJNI::defaultColorSpace() {
458#ifdef ANDROID_ENABLE_LINEAR_BLENDING
459    return SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
460#else
461    return nullptr;
462#endif
463}
464
465sk_sp<SkColorSpace> GraphicsJNI::linearColorSpace() {
466    return SkColorSpace::MakeNamed(SkColorSpace::kSRGBLinear_Named);
467}
468
469sk_sp<SkColorSpace> GraphicsJNI::colorSpaceForType(SkColorType type) {
470    switch (type) {
471        case kRGBA_F16_SkColorType:
472            return linearColorSpace();
473        default:
474            return defaultColorSpace();
475    }
476}
477
478///////////////////////////////////////////////////////////////////////////////
479bool HeapAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
480    mStorage = android::Bitmap::allocateHeapBitmap(bitmap, ctable);
481    return !!mStorage;
482}
483
484////////////////////////////////////////////////////////////////////////////////
485
486RecyclingClippingPixelAllocator::RecyclingClippingPixelAllocator(
487        android::Bitmap* recycledBitmap, size_t recycledBytes)
488    : mRecycledBitmap(recycledBitmap)
489    , mRecycledBytes(recycledBytes)
490    , mSkiaBitmap(nullptr)
491    , mNeedsCopy(false)
492{}
493
494RecyclingClippingPixelAllocator::~RecyclingClippingPixelAllocator() {}
495
496bool RecyclingClippingPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
497    // Ensure that the caller did not pass in a NULL bitmap to the constructor or this
498    // function.
499    LOG_ALWAYS_FATAL_IF(!mRecycledBitmap);
500    LOG_ALWAYS_FATAL_IF(!bitmap);
501    mSkiaBitmap = bitmap;
502
503    // This behaves differently than the RecyclingPixelAllocator.  For backwards
504    // compatibility, the original color type of the recycled bitmap must be maintained.
505    if (mRecycledBitmap->info().colorType() != bitmap->colorType()) {
506        return false;
507    }
508
509    // The Skia bitmap specifies the width and height needed by the decoder.
510    // mRecycledBitmap specifies the width and height of the bitmap that we
511    // want to reuse.  Neither can be changed.  We will try to find a way
512    // to reuse the memory.
513    const int maxWidth = SkTMax(bitmap->width(), mRecycledBitmap->info().width());
514    const int maxHeight = SkTMax(bitmap->height(), mRecycledBitmap->info().height());
515    const SkImageInfo maxInfo = bitmap->info().makeWH(maxWidth, maxHeight);
516    const size_t rowBytes = maxInfo.minRowBytes();
517    const size_t bytesNeeded = maxInfo.getSafeSize(rowBytes);
518    if (bytesNeeded <= mRecycledBytes) {
519        // Here we take advantage of reconfigure() to reset the rowBytes and ctable
520        // of mRecycledBitmap.  It is very important that we pass in
521        // mRecycledBitmap->info() for the SkImageInfo.  According to the
522        // specification for BitmapRegionDecoder, we are not allowed to change
523        // the SkImageInfo.
524        mRecycledBitmap->reconfigure(mRecycledBitmap->info(), rowBytes, ctable);
525
526        // Give the bitmap the same pixelRef as mRecycledBitmap.
527        // skbug.com/4538: We also need to make sure that the rowBytes on the pixel ref
528        //                 match the rowBytes on the bitmap.
529        bitmap->setInfo(bitmap->info(), rowBytes);
530        mRecycledBitmap->ref();
531        bitmap->setPixelRef(mRecycledBitmap)->unref();
532
533        // Make sure that the recycled bitmap has the correct alpha type.
534        mRecycledBitmap->setAlphaType(bitmap->alphaType());
535
536        bitmap->notifyPixelsChanged();
537        bitmap->lockPixels();
538        mNeedsCopy = false;
539
540        // TODO: If the dimensions of the SkBitmap are smaller than those of
541        // mRecycledBitmap, should we zero the memory in mRecycledBitmap?
542        return true;
543    }
544
545    // In the event that mRecycledBitmap is not large enough, allocate new memory
546    // on the heap.
547    SkBitmap::HeapAllocator heapAllocator;
548
549    // We will need to copy from heap memory to mRecycledBitmap's memory after the
550    // decode is complete.
551    mNeedsCopy = true;
552
553    return heapAllocator.allocPixelRef(bitmap, ctable);
554}
555
556void RecyclingClippingPixelAllocator::copyIfNecessary() {
557    if (mNeedsCopy) {
558        mRecycledBitmap->ref();
559        SkPixelRef* recycledPixels = mRecycledBitmap;
560        void* dst = recycledPixels->pixels();
561        const size_t dstRowBytes = mRecycledBitmap->rowBytes();
562        const size_t bytesToCopy = std::min(mRecycledBitmap->info().minRowBytes(),
563                mSkiaBitmap->info().minRowBytes());
564        const int rowsToCopy = std::min(mRecycledBitmap->info().height(),
565                mSkiaBitmap->info().height());
566        for (int y = 0; y < rowsToCopy; y++) {
567            memcpy(dst, mSkiaBitmap->getAddr(0, y), bytesToCopy);
568            dst = SkTAddOffset<void>(dst, dstRowBytes);
569        }
570        recycledPixels->notifyPixelsChanged();
571        recycledPixels->unref();
572    }
573    mRecycledBitmap = nullptr;
574    mSkiaBitmap = nullptr;
575}
576
577////////////////////////////////////////////////////////////////////////////////
578
579AshmemPixelAllocator::AshmemPixelAllocator(JNIEnv *env) {
580    LOG_ALWAYS_FATAL_IF(env->GetJavaVM(&mJavaVM) != JNI_OK,
581            "env->GetJavaVM failed");
582}
583
584bool AshmemPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
585    mStorage = android::Bitmap::allocateAshmemBitmap(bitmap, ctable);
586    return !!mStorage;
587}
588
589////////////////////////////////////////////////////////////////////////////////
590
591static jclass make_globalref(JNIEnv* env, const char classname[])
592{
593    jclass c = env->FindClass(classname);
594    SkASSERT(c);
595    return (jclass) env->NewGlobalRef(c);
596}
597
598static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
599                                const char fieldname[], const char type[])
600{
601    jfieldID id = env->GetFieldID(clazz, fieldname, type);
602    SkASSERT(id);
603    return id;
604}
605
606int register_android_graphics_Graphics(JNIEnv* env)
607{
608    jmethodID m;
609    jclass c;
610
611    gRect_class = make_globalref(env, "android/graphics/Rect");
612    gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
613    gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
614    gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
615    gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
616
617    gRectF_class = make_globalref(env, "android/graphics/RectF");
618    gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
619    gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
620    gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
621    gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
622
623    gPoint_class = make_globalref(env, "android/graphics/Point");
624    gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
625    gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
626
627    gPointF_class = make_globalref(env, "android/graphics/PointF");
628    gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
629    gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
630
631    gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
632    gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(J)V");
633
634    gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
635    gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
636                                                     "nativeInt", "I");
637
638    gCanvas_class = make_globalref(env, "android/graphics/Canvas");
639    gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvasWrapper", "J");
640
641    gPicture_class = make_globalref(env, "android/graphics/Picture");
642    gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "J");
643
644    gRegion_class = make_globalref(env, "android/graphics/Region");
645    gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "J");
646    gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
647        "(JI)V");
648
649    c = env->FindClass("java/lang/Byte");
650    gByte_class = (jclass) env->NewGlobalRef(
651        env->GetStaticObjectField(c, env->GetStaticFieldID(c, "TYPE", "Ljava/lang/Class;")));
652
653    gVMRuntime_class = make_globalref(env, "dalvik/system/VMRuntime");
654    m = env->GetStaticMethodID(gVMRuntime_class, "getRuntime", "()Ldalvik/system/VMRuntime;");
655    gVMRuntime = env->NewGlobalRef(env->CallStaticObjectMethod(gVMRuntime_class, m));
656    gVMRuntime_newNonMovableArray = env->GetMethodID(gVMRuntime_class, "newNonMovableArray",
657                                                     "(Ljava/lang/Class;I)Ljava/lang/Object;");
658    gVMRuntime_addressOf = env->GetMethodID(gVMRuntime_class, "addressOf", "(Ljava/lang/Object;)J");
659
660    return 0;
661}
662