Graphics.cpp revision b59508fce51b23f0201f4dcba7e4f18bab4f9d1a 
1#define LOG_TAG "GraphicsJNI"
2
3#include "jni.h"
4#include "JNIHelp.h"
5#include "GraphicsJNI.h"
6#include "AndroidPicture.h"
7
8#include "SkCanvas.h"
9#include "SkDevice.h"
10#include "SkMath.h"
11#include "SkPicture.h"
12#include "SkRegion.h"
13#include <android_runtime/AndroidRuntime.h>
14
15void doThrowNPE(JNIEnv* env) {
16    jniThrowNullPointerException(env, NULL);
17}
18
19void doThrowAIOOBE(JNIEnv* env) {
20    jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
21}
22
23void doThrowRE(JNIEnv* env, const char* msg) {
24    jniThrowRuntimeException(env, msg);
25}
26
27void doThrowIAE(JNIEnv* env, const char* msg) {
28    jniThrowException(env, "java/lang/IllegalArgumentException", msg);
29}
30
31void doThrowISE(JNIEnv* env, const char* msg) {
32    jniThrowException(env, "java/lang/IllegalStateException", msg);
33}
34
35void doThrowOOME(JNIEnv* env, const char* msg) {
36    jniThrowException(env, "java/lang/OutOfMemoryError", msg);
37}
38
39void doThrowIOE(JNIEnv* env, const char* msg) {
40    jniThrowException(env, "java/io/IOException", msg);
41}
42
43bool GraphicsJNI::hasException(JNIEnv *env) {
44    if (env->ExceptionCheck() != 0) {
45        ALOGE("*** Uncaught exception returned from Java call!\n");
46        env->ExceptionDescribe();
47        return true;
48    }
49    return false;
50}
51
52///////////////////////////////////////////////////////////////////////////////
53
54AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
55                                       int minLength, JNIAccess access)
56: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
57    SkASSERT(env);
58    if (array) {
59        fLen = env->GetArrayLength(array);
60        if (fLen < minLength) {
61            sk_throw();
62        }
63        fPtr = env->GetFloatArrayElements(array, NULL);
64    }
65    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
66}
67
68AutoJavaFloatArray::~AutoJavaFloatArray() {
69    if (fPtr) {
70        fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
71    }
72}
73
74AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
75                                       int minLength)
76: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
77    SkASSERT(env);
78    if (array) {
79        fLen = env->GetArrayLength(array);
80        if (fLen < minLength) {
81            sk_throw();
82        }
83        fPtr = env->GetIntArrayElements(array, NULL);
84    }
85}
86
87AutoJavaIntArray::~AutoJavaIntArray() {
88    if (fPtr) {
89        fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
90    }
91}
92
93AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
94                                       int minLength, JNIAccess access)
95: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
96    SkASSERT(env);
97    if (array) {
98        fLen = env->GetArrayLength(array);
99        if (fLen < minLength) {
100            sk_throw();
101        }
102        fPtr = env->GetShortArrayElements(array, NULL);
103    }
104    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
105}
106
107AutoJavaShortArray::~AutoJavaShortArray() {
108    if (fPtr) {
109        fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
110    }
111}
112
113AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
114                                       int minLength)
115: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
116    SkASSERT(env);
117    if (array) {
118        fLen = env->GetArrayLength(array);
119        if (fLen < minLength) {
120            sk_throw();
121        }
122        fPtr = env->GetByteArrayElements(array, NULL);
123    }
124}
125
126AutoJavaByteArray::~AutoJavaByteArray() {
127    if (fPtr) {
128        fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
129    }
130}
131
132///////////////////////////////////////////////////////////////////////////////
133
134static jclass   gRect_class;
135static jfieldID gRect_leftFieldID;
136static jfieldID gRect_topFieldID;
137static jfieldID gRect_rightFieldID;
138static jfieldID gRect_bottomFieldID;
139
140static jclass   gRectF_class;
141static jfieldID gRectF_leftFieldID;
142static jfieldID gRectF_topFieldID;
143static jfieldID gRectF_rightFieldID;
144static jfieldID gRectF_bottomFieldID;
145
146static jclass   gPoint_class;
147static jfieldID gPoint_xFieldID;
148static jfieldID gPoint_yFieldID;
149
150static jclass   gPointF_class;
151static jfieldID gPointF_xFieldID;
152static jfieldID gPointF_yFieldID;
153
154static jclass   gBitmap_class;
155static jfieldID gBitmap_nativeInstanceID;
156static jmethodID gBitmap_constructorMethodID;
157static jmethodID gBitmap_reinitMethodID;
158static jmethodID gBitmap_getAllocationByteCountMethodID;
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   gPaint_class;
170static jfieldID gPaint_nativeInstanceID;
171static jfieldID gPaint_nativeTypefaceID;
172
173static jclass   gPicture_class;
174static jfieldID gPicture_nativeInstanceID;
175
176static jclass   gRegion_class;
177static jfieldID gRegion_nativeInstanceID;
178static jmethodID gRegion_constructorMethodID;
179
180static jclass    gByte_class;
181static jobject   gVMRuntime;
182static jclass    gVMRuntime_class;
183static jmethodID gVMRuntime_newNonMovableArray;
184static jmethodID gVMRuntime_addressOf;
185
186///////////////////////////////////////////////////////////////////////////////
187
188void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
189{
190    SkASSERT(env->IsInstanceOf(obj, gRect_class));
191
192    *L = env->GetIntField(obj, gRect_leftFieldID);
193    *T = env->GetIntField(obj, gRect_topFieldID);
194    *R = env->GetIntField(obj, gRect_rightFieldID);
195    *B = env->GetIntField(obj, gRect_bottomFieldID);
196}
197
198void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
199{
200    SkASSERT(env->IsInstanceOf(obj, gRect_class));
201
202    env->SetIntField(obj, gRect_leftFieldID, L);
203    env->SetIntField(obj, gRect_topFieldID, T);
204    env->SetIntField(obj, gRect_rightFieldID, R);
205    env->SetIntField(obj, gRect_bottomFieldID, B);
206}
207
208SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
209{
210    SkASSERT(env->IsInstanceOf(obj, gRect_class));
211
212    ir->set(env->GetIntField(obj, gRect_leftFieldID),
213            env->GetIntField(obj, gRect_topFieldID),
214            env->GetIntField(obj, gRect_rightFieldID),
215            env->GetIntField(obj, gRect_bottomFieldID));
216    return ir;
217}
218
219void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
220{
221    SkASSERT(env->IsInstanceOf(obj, gRect_class));
222
223    env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
224    env->SetIntField(obj, gRect_topFieldID, ir.fTop);
225    env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
226    env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
227}
228
229SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
230{
231    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
232
233    r->set(env->GetFloatField(obj, gRectF_leftFieldID),
234           env->GetFloatField(obj, gRectF_topFieldID),
235           env->GetFloatField(obj, gRectF_rightFieldID),
236           env->GetFloatField(obj, gRectF_bottomFieldID));
237    return r;
238}
239
240SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
241{
242    SkASSERT(env->IsInstanceOf(obj, gRect_class));
243
244    r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
245           SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
246           SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
247           SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
248    return r;
249}
250
251void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
252{
253    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
254
255    env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
256    env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
257    env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
258    env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
259}
260
261SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
262{
263    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
264
265    point->set(env->GetIntField(obj, gPoint_xFieldID),
266               env->GetIntField(obj, gPoint_yFieldID));
267    return point;
268}
269
270void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
271{
272    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
273
274    env->SetIntField(obj, gPoint_xFieldID, ir.fX);
275    env->SetIntField(obj, gPoint_yFieldID, ir.fY);
276}
277
278SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
279{
280    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
281
282    point->set(env->GetIntField(obj, gPointF_xFieldID),
283               env->GetIntField(obj, gPointF_yFieldID));
284    return point;
285}
286
287void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
288{
289    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
290
291    env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
292    env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
293}
294
295SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
296    SkASSERT(env);
297    SkASSERT(bitmap);
298    SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
299    jlong bitmapHandle = env->GetLongField(bitmap, gBitmap_nativeInstanceID);
300    SkBitmap* b = reinterpret_cast<SkBitmap*>(bitmapHandle);
301    SkASSERT(b);
302    return b;
303}
304
305SkBitmap::Config GraphicsJNI::getNativeBitmapConfig(JNIEnv* env,
306                                                    jobject jconfig) {
307    SkASSERT(env);
308    if (NULL == jconfig) {
309        return SkBitmap::kNo_Config;
310    }
311    SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
312    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
313    if (c < 0 || c >= SkBitmap::kConfigCount) {
314        c = SkBitmap::kNo_Config;
315    }
316    return static_cast<SkBitmap::Config>(c);
317}
318
319SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
320    SkASSERT(env);
321    SkASSERT(canvas);
322    SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
323    jlong canvasHandle = env->GetLongField(canvas, gCanvas_nativeInstanceID);
324    SkCanvas* c = getNativeCanvas(canvasHandle);
325    SkASSERT(c);
326    return c;
327}
328
329SkPaint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
330    SkASSERT(env);
331    SkASSERT(paint);
332    SkASSERT(env->IsInstanceOf(paint, gPaint_class));
333    jlong paintHandle = env->GetLongField(paint, gPaint_nativeInstanceID);
334    SkPaint* p = reinterpret_cast<SkPaint*>(paintHandle);
335    SkASSERT(p);
336    return p;
337}
338
339android::TypefaceImpl* GraphicsJNI::getNativeTypeface(JNIEnv* env, jobject paint) {
340    SkASSERT(env);
341    SkASSERT(paint);
342    SkASSERT(env->IsInstanceOf(paint, gPaint_class));
343    jlong typefaceHandle = env->GetLongField(paint, gPaint_nativeTypefaceID);
344    android::TypefaceImpl* p = reinterpret_cast<android::TypefaceImpl*>(typefaceHandle);
345    SkASSERT(p);
346    return p;
347}
348
349AndroidPicture* GraphicsJNI::getNativePicture(JNIEnv* env, jobject picture)
350{
351    SkASSERT(env);
352    SkASSERT(picture);
353    SkASSERT(env->IsInstanceOf(picture, gPicture_class));
354    jlong pictureHandle = env->GetLongField(picture, gPicture_nativeInstanceID);
355    AndroidPicture* p = reinterpret_cast<AndroidPicture*>(pictureHandle);
356    SkASSERT(p);
357    return p;
358}
359
360SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
361{
362    SkASSERT(env);
363    SkASSERT(region);
364    SkASSERT(env->IsInstanceOf(region, gRegion_class));
365    jlong regionHandle = env->GetLongField(region, gRegion_nativeInstanceID);
366    SkRegion* r = reinterpret_cast<SkRegion*>(regionHandle);
367    SkASSERT(r);
368    return r;
369}
370
371///////////////////////////////////////////////////////////////////////////////////////////
372
373// Assert that bitmap's SkAlphaType is consistent with isPremultiplied.
374static void assert_premultiplied(const SkBitmap& bitmap, bool isPremultiplied) {
375    // kOpaque_SkAlphaType and kIgnore_SkAlphaType mean that isPremultiplied is
376    // irrelevant. This just tests to ensure that the SkAlphaType is not
377    // opposite of isPremultiplied.
378    if (isPremultiplied) {
379        SkASSERT(bitmap.alphaType() != kUnpremul_SkAlphaType);
380    } else {
381        SkASSERT(bitmap.alphaType() != kPremul_SkAlphaType);
382    }
383}
384
385jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
386        int bitmapCreateFlags, jbyteArray ninepatch, jintArray layoutbounds, int density)
387{
388    SkASSERT(bitmap);
389    SkASSERT(bitmap->pixelRef());
390    bool isMutable = bitmapCreateFlags & kBitmapCreateFlag_Mutable;
391    bool isPremultiplied = bitmapCreateFlags & kBitmapCreateFlag_Premultiplied;
392
393    // The caller needs to have already set the alpha type properly, so the
394    // native SkBitmap stays in sync with the Java Bitmap.
395    assert_premultiplied(*bitmap, isPremultiplied);
396
397    jobject obj = env->NewObject(gBitmap_class, gBitmap_constructorMethodID,
398            reinterpret_cast<jlong>(bitmap), buffer,
399            bitmap->width(), bitmap->height(), density, isMutable, isPremultiplied,
400            ninepatch, layoutbounds);
401    hasException(env); // For the side effect of logging.
402    return obj;
403}
404
405jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, int bitmapCreateFlags,
406        jbyteArray ninepatch, int density)
407{
408    return createBitmap(env, bitmap, NULL, bitmapCreateFlags, ninepatch, NULL, density);
409}
410
411void GraphicsJNI::reinitBitmap(JNIEnv* env, jobject javaBitmap, SkBitmap* bitmap,
412        bool isPremultiplied)
413{
414    // The caller needs to have already set the alpha type properly, so the
415    // native SkBitmap stays in sync with the Java Bitmap.
416    assert_premultiplied(*bitmap, isPremultiplied);
417
418    env->CallVoidMethod(javaBitmap, gBitmap_reinitMethodID,
419            bitmap->width(), bitmap->height(), isPremultiplied);
420}
421
422int GraphicsJNI::getBitmapAllocationByteCount(JNIEnv* env, jobject javaBitmap)
423{
424    return env->CallIntMethod(javaBitmap, gBitmap_getAllocationByteCountMethodID);
425}
426
427jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
428{
429    SkASSERT(bitmap != NULL);
430
431    jobject obj = env->NewObject(gBitmapRegionDecoder_class,
432            gBitmapRegionDecoder_constructorMethodID,
433            reinterpret_cast<jlong>(bitmap));
434    hasException(env); // For the side effect of logging.
435    return obj;
436}
437
438jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
439{
440    SkASSERT(region != NULL);
441    jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
442                                 reinterpret_cast<jlong>(region), 0);
443    hasException(env); // For the side effect of logging.
444    return obj;
445}
446
447static JNIEnv* vm2env(JavaVM* vm)
448{
449    JNIEnv* env = NULL;
450    if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
451    {
452        SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
453        sk_throw();
454    }
455    return env;
456}
457
458///////////////////////////////////////////////////////////////////////////////
459
460AndroidPixelRef::AndroidPixelRef(JNIEnv* env, const SkImageInfo& info, void* storage,
461        size_t rowBytes, jbyteArray storageObj, SkColorTable* ctable) :
462        SkMallocPixelRef(info, storage, rowBytes, ctable, (storageObj == NULL)),
463        fWrappedPixelRef(NULL) {
464    SkASSERT(storage);
465    SkASSERT(env);
466
467    if (env->GetJavaVM(&fVM) != JNI_OK) {
468        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
469        sk_throw();
470    }
471    fStorageObj = storageObj;
472    fHasGlobalRef = false;
473    fGlobalRefCnt = 0;
474
475    // If storageObj is NULL, the memory was NOT allocated on the Java heap
476    fOnJavaHeap = (storageObj != NULL);
477
478}
479
480AndroidPixelRef::AndroidPixelRef(AndroidPixelRef& wrappedPixelRef, const SkImageInfo& info,
481        size_t rowBytes, SkColorTable* ctable) :
482        SkMallocPixelRef(info, wrappedPixelRef.getAddr(), rowBytes, ctable, false),
483        fWrappedPixelRef(wrappedPixelRef.fWrappedPixelRef ?
484                wrappedPixelRef.fWrappedPixelRef : &wrappedPixelRef)
485{
486    SkASSERT(fWrappedPixelRef);
487    SkSafeRef(fWrappedPixelRef);
488
489    // don't need to initialize these, as all the relevant logic delegates to the wrapped ref
490    fStorageObj = NULL;
491    fHasGlobalRef = false;
492    fGlobalRefCnt = 0;
493    fOnJavaHeap = false;
494}
495
496AndroidPixelRef::~AndroidPixelRef() {
497    if (fWrappedPixelRef) {
498        SkSafeUnref(fWrappedPixelRef);
499    } else if (fOnJavaHeap) {
500        JNIEnv* env = vm2env(fVM);
501
502        if (fStorageObj && fHasGlobalRef) {
503            env->DeleteGlobalRef(fStorageObj);
504        }
505        fStorageObj = NULL;
506    }
507}
508jbyteArray AndroidPixelRef::getStorageObj() {
509    if (fWrappedPixelRef) {
510        return fWrappedPixelRef->fStorageObj;
511    }
512    return fStorageObj;
513}
514
515void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
516    if (fWrappedPixelRef) {
517        // delegate java obj management to the wrapped ref
518        fWrappedPixelRef->setLocalJNIRef(arr);
519    } else if (!fHasGlobalRef) {
520        fStorageObj = arr;
521    }
522}
523
524void AndroidPixelRef::globalRef(void* localref) {
525    if (fWrappedPixelRef) {
526        // delegate java obj management to the wrapped ref
527        fWrappedPixelRef->globalRef(localref);
528
529        // Note: we only ref and unref the wrapped AndroidPixelRef so that
530        // bitmap->pixelRef()->globalRef() and globalUnref() can be used in a pair, even if
531        // the bitmap has its underlying AndroidPixelRef swapped out/wrapped
532        return;
533    }
534    if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
535        JNIEnv *env = vm2env(fVM);
536
537        // If JNI ref was passed, it is always used
538        if (localref) fStorageObj = (jbyteArray) localref;
539
540        if (fStorageObj == NULL) {
541            SkDebugf("No valid local ref to create a JNI global ref\n");
542            sk_throw();
543        }
544        if (fHasGlobalRef) {
545            // This should never happen
546            SkDebugf("Already holding a JNI global ref");
547            sk_throw();
548        }
549
550        fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
551        // TODO: Check for failure here
552        fHasGlobalRef = true;
553    }
554    ref();
555}
556
557void AndroidPixelRef::globalUnref() {
558    if (fWrappedPixelRef) {
559        // delegate java obj management to the wrapped ref
560        fWrappedPixelRef->globalUnref();
561        return;
562    }
563    if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
564        JNIEnv *env = vm2env(fVM);
565        if (!fHasGlobalRef) {
566            SkDebugf("We don't have a global ref!");
567            sk_throw();
568        }
569        env->DeleteGlobalRef(fStorageObj);
570        fStorageObj = NULL;
571        fHasGlobalRef = false;
572    }
573    unref();
574}
575
576///////////////////////////////////////////////////////////////////////////////
577
578jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
579                                             SkColorTable* ctable) {
580    const SkImageInfo& info = bitmap->info();
581    if (info.fColorType == kUnknown_SkColorType) {
582        doThrowIAE(env, "unknown bitmap configuration");
583        return NULL;
584    }
585
586    const size_t size = bitmap->getSize();
587    jbyteArray arrayObj = (jbyteArray) env->CallObjectMethod(gVMRuntime,
588                                                             gVMRuntime_newNonMovableArray,
589                                                             gByte_class, size);
590    if (env->ExceptionCheck() != 0) {
591        return NULL;
592    }
593    SkASSERT(arrayObj);
594    jbyte* addr = (jbyte*) env->CallLongMethod(gVMRuntime, gVMRuntime_addressOf, arrayObj);
595    if (env->ExceptionCheck() != 0) {
596        return NULL;
597    }
598    SkASSERT(addr);
599    SkPixelRef* pr = new AndroidPixelRef(env, info, (void*) addr,
600            bitmap->rowBytes(), arrayObj, ctable);
601    bitmap->setPixelRef(pr)->unref();
602    // since we're already allocated, we lockPixels right away
603    // HeapAllocator behaves this way too
604    bitmap->lockPixels();
605
606    return arrayObj;
607}
608
609///////////////////////////////////////////////////////////////////////////////
610
611JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
612    : fStorageObj(NULL),
613      fAllocCount(0) {
614    if (env->GetJavaVM(&fVM) != JNI_OK) {
615        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
616        sk_throw();
617    }
618}
619
620bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
621    JNIEnv* env = vm2env(fVM);
622
623    fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
624    fAllocCount += 1;
625    return fStorageObj != NULL;
626}
627
628////////////////////////////////////////////////////////////////////////////////
629
630JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
631    fEnv = env;
632    fNativeBitmap = nativeBitmap;
633    fBuffer = buffer;
634
635    // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
636    if (fBuffer) {
637        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
638    }
639}
640
641JavaHeapBitmapRef::~JavaHeapBitmapRef() {
642    if (fBuffer) {
643        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
644    }
645}
646
647////////////////////////////////////////////////////////////////////////////////
648
649static jclass make_globalref(JNIEnv* env, const char classname[])
650{
651    jclass c = env->FindClass(classname);
652    SkASSERT(c);
653    return (jclass) env->NewGlobalRef(c);
654}
655
656static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
657                                const char fieldname[], const char type[])
658{
659    jfieldID id = env->GetFieldID(clazz, fieldname, type);
660    SkASSERT(id);
661    return id;
662}
663
664int register_android_graphics_Graphics(JNIEnv* env)
665{
666    jmethodID m;
667    jclass c;
668
669    gRect_class = make_globalref(env, "android/graphics/Rect");
670    gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
671    gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
672    gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
673    gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
674
675    gRectF_class = make_globalref(env, "android/graphics/RectF");
676    gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
677    gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
678    gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
679    gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
680
681    gPoint_class = make_globalref(env, "android/graphics/Point");
682    gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
683    gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
684
685    gPointF_class = make_globalref(env, "android/graphics/PointF");
686    gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
687    gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
688
689    gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
690    gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "J");
691    gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>", "(J[BIIIZZ[B[I)V");
692    gBitmap_reinitMethodID = env->GetMethodID(gBitmap_class, "reinit", "(IIZ)V");
693    gBitmap_getAllocationByteCountMethodID = env->GetMethodID(gBitmap_class, "getAllocationByteCount", "()I");
694    gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
695    gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(J)V");
696
697    gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
698    gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
699                                                     "nativeInt", "I");
700
701    gCanvas_class = make_globalref(env, "android/graphics/Canvas");
702    gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvasWrapper", "J");
703
704    gPaint_class = make_globalref(env, "android/graphics/Paint");
705    gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "J");
706    gPaint_nativeTypefaceID = getFieldIDCheck(env, gPaint_class, "mNativeTypeface", "J");
707
708    gPicture_class = make_globalref(env, "android/graphics/Picture");
709    gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "J");
710
711    gRegion_class = make_globalref(env, "android/graphics/Region");
712    gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "J");
713    gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
714        "(JI)V");
715
716    c = env->FindClass("java/lang/Byte");
717    gByte_class = (jclass) env->NewGlobalRef(
718        env->GetStaticObjectField(c, env->GetStaticFieldID(c, "TYPE", "Ljava/lang/Class;")));
719
720    gVMRuntime_class = make_globalref(env, "dalvik/system/VMRuntime");
721    m = env->GetStaticMethodID(gVMRuntime_class, "getRuntime", "()Ldalvik/system/VMRuntime;");
722    gVMRuntime = env->NewGlobalRef(env->CallStaticObjectMethod(gVMRuntime_class, m));
723    gVMRuntime_newNonMovableArray = env->GetMethodID(gVMRuntime_class, "newNonMovableArray",
724                                                     "(Ljava/lang/Class;I)Ljava/lang/Object;");
725    gVMRuntime_addressOf = env->GetMethodID(gVMRuntime_class, "addressOf", "(Ljava/lang/Object;)J");
726
727    return 0;
728}
729