Graphics.cpp revision 28a1222bafbc5b3124cc8a5c400024c037047699 
1#define LOG_TAG "GraphicsJNI"
2
3#include "jni.h"
4#include "JNIHelp.h"
5#include "GraphicsJNI.h"
6
7#include "SkCanvas.h"
8#include "SkDevice.h"
9#include "SkPicture.h"
10#include "SkRegion.h"
11#include <android_runtime/AndroidRuntime.h>
12
13void doThrowNPE(JNIEnv* env) {
14    jniThrowNullPointerException(env, NULL);
15}
16
17void doThrowAIOOBE(JNIEnv* env) {
18    jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
19}
20
21void doThrowRE(JNIEnv* env, const char* msg) {
22    jniThrowRuntimeException(env, msg);
23}
24
25void doThrowIAE(JNIEnv* env, const char* msg) {
26    jniThrowException(env, "java/lang/IllegalArgumentException", msg);
27}
28
29void doThrowISE(JNIEnv* env, const char* msg) {
30    jniThrowException(env, "java/lang/IllegalStateException", msg);
31}
32
33void doThrowOOME(JNIEnv* env, const char* msg) {
34    jniThrowException(env, "java/lang/OutOfMemoryError", msg);
35}
36
37void doThrowIOE(JNIEnv* env, const char* msg) {
38    jniThrowException(env, "java/io/IOException", msg);
39}
40
41bool GraphicsJNI::hasException(JNIEnv *env) {
42    if (env->ExceptionCheck() != 0) {
43        ALOGE("*** Uncaught exception returned from Java call!\n");
44        env->ExceptionDescribe();
45        return true;
46    }
47    return false;
48}
49
50///////////////////////////////////////////////////////////////////////////////
51
52AutoJavaFloatArray::AutoJavaFloatArray(JNIEnv* env, jfloatArray array,
53                                       int minLength, JNIAccess access)
54: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
55    SkASSERT(env);
56    if (array) {
57        fLen = env->GetArrayLength(array);
58        if (fLen < minLength) {
59            sk_throw();
60        }
61        fPtr = env->GetFloatArrayElements(array, NULL);
62    }
63    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
64}
65
66AutoJavaFloatArray::~AutoJavaFloatArray() {
67    if (fPtr) {
68        fEnv->ReleaseFloatArrayElements(fArray, fPtr, fReleaseMode);
69    }
70}
71
72AutoJavaIntArray::AutoJavaIntArray(JNIEnv* env, jintArray array,
73                                       int minLength)
74: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
75    SkASSERT(env);
76    if (array) {
77        fLen = env->GetArrayLength(array);
78        if (fLen < minLength) {
79            sk_throw();
80        }
81        fPtr = env->GetIntArrayElements(array, NULL);
82    }
83}
84
85AutoJavaIntArray::~AutoJavaIntArray() {
86    if (fPtr) {
87        fEnv->ReleaseIntArrayElements(fArray, fPtr, 0);
88    }
89}
90
91AutoJavaShortArray::AutoJavaShortArray(JNIEnv* env, jshortArray array,
92                                       int minLength, JNIAccess access)
93: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
94    SkASSERT(env);
95    if (array) {
96        fLen = env->GetArrayLength(array);
97        if (fLen < minLength) {
98            sk_throw();
99        }
100        fPtr = env->GetShortArrayElements(array, NULL);
101    }
102    fReleaseMode = (access == kRO_JNIAccess) ? JNI_ABORT : 0;
103}
104
105AutoJavaShortArray::~AutoJavaShortArray() {
106    if (fPtr) {
107        fEnv->ReleaseShortArrayElements(fArray, fPtr, fReleaseMode);
108    }
109}
110
111AutoJavaByteArray::AutoJavaByteArray(JNIEnv* env, jbyteArray array,
112                                       int minLength)
113: fEnv(env), fArray(array), fPtr(NULL), fLen(0) {
114    SkASSERT(env);
115    if (array) {
116        fLen = env->GetArrayLength(array);
117        if (fLen < minLength) {
118            sk_throw();
119        }
120        fPtr = env->GetByteArrayElements(array, NULL);
121    }
122}
123
124AutoJavaByteArray::~AutoJavaByteArray() {
125    if (fPtr) {
126        fEnv->ReleaseByteArrayElements(fArray, fPtr, 0);
127    }
128}
129
130///////////////////////////////////////////////////////////////////////////////
131
132static jclass   gRect_class;
133static jfieldID gRect_leftFieldID;
134static jfieldID gRect_topFieldID;
135static jfieldID gRect_rightFieldID;
136static jfieldID gRect_bottomFieldID;
137
138static jclass   gRectF_class;
139static jfieldID gRectF_leftFieldID;
140static jfieldID gRectF_topFieldID;
141static jfieldID gRectF_rightFieldID;
142static jfieldID gRectF_bottomFieldID;
143
144static jclass   gPoint_class;
145static jfieldID gPoint_xFieldID;
146static jfieldID gPoint_yFieldID;
147
148static jclass   gPointF_class;
149static jfieldID gPointF_xFieldID;
150static jfieldID gPointF_yFieldID;
151
152static jclass   gBitmap_class;
153static jfieldID gBitmap_nativeInstanceID;
154static jmethodID gBitmap_constructorMethodID;
155static jmethodID gBitmap_reinitMethodID;
156static jmethodID gBitmap_getAllocationByteCountMethodID;
157
158static jclass   gBitmapConfig_class;
159static jfieldID gBitmapConfig_nativeInstanceID;
160
161static jclass   gBitmapRegionDecoder_class;
162static jmethodID gBitmapRegionDecoder_constructorMethodID;
163
164static jclass   gCanvas_class;
165static jfieldID gCanvas_nativeInstanceID;
166
167static jclass   gPaint_class;
168static jfieldID gPaint_nativeInstanceID;
169
170static jclass   gPicture_class;
171static jfieldID gPicture_nativeInstanceID;
172
173static jclass   gRegion_class;
174static jfieldID gRegion_nativeInstanceID;
175static jmethodID gRegion_constructorMethodID;
176
177///////////////////////////////////////////////////////////////////////////////
178
179void GraphicsJNI::get_jrect(JNIEnv* env, jobject obj, int* L, int* T, int* R, int* B)
180{
181    SkASSERT(env->IsInstanceOf(obj, gRect_class));
182
183    *L = env->GetIntField(obj, gRect_leftFieldID);
184    *T = env->GetIntField(obj, gRect_topFieldID);
185    *R = env->GetIntField(obj, gRect_rightFieldID);
186    *B = env->GetIntField(obj, gRect_bottomFieldID);
187}
188
189void GraphicsJNI::set_jrect(JNIEnv* env, jobject obj, int L, int T, int R, int B)
190{
191    SkASSERT(env->IsInstanceOf(obj, gRect_class));
192
193    env->SetIntField(obj, gRect_leftFieldID, L);
194    env->SetIntField(obj, gRect_topFieldID, T);
195    env->SetIntField(obj, gRect_rightFieldID, R);
196    env->SetIntField(obj, gRect_bottomFieldID, B);
197}
198
199SkIRect* GraphicsJNI::jrect_to_irect(JNIEnv* env, jobject obj, SkIRect* ir)
200{
201    SkASSERT(env->IsInstanceOf(obj, gRect_class));
202
203    ir->set(env->GetIntField(obj, gRect_leftFieldID),
204            env->GetIntField(obj, gRect_topFieldID),
205            env->GetIntField(obj, gRect_rightFieldID),
206            env->GetIntField(obj, gRect_bottomFieldID));
207    return ir;
208}
209
210void GraphicsJNI::irect_to_jrect(const SkIRect& ir, JNIEnv* env, jobject obj)
211{
212    SkASSERT(env->IsInstanceOf(obj, gRect_class));
213
214    env->SetIntField(obj, gRect_leftFieldID, ir.fLeft);
215    env->SetIntField(obj, gRect_topFieldID, ir.fTop);
216    env->SetIntField(obj, gRect_rightFieldID, ir.fRight);
217    env->SetIntField(obj, gRect_bottomFieldID, ir.fBottom);
218}
219
220SkRect* GraphicsJNI::jrectf_to_rect(JNIEnv* env, jobject obj, SkRect* r)
221{
222    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
223
224    r->set(SkFloatToScalar(env->GetFloatField(obj, gRectF_leftFieldID)),
225           SkFloatToScalar(env->GetFloatField(obj, gRectF_topFieldID)),
226           SkFloatToScalar(env->GetFloatField(obj, gRectF_rightFieldID)),
227           SkFloatToScalar(env->GetFloatField(obj, gRectF_bottomFieldID)));
228    return r;
229}
230
231SkRect* GraphicsJNI::jrect_to_rect(JNIEnv* env, jobject obj, SkRect* r)
232{
233    SkASSERT(env->IsInstanceOf(obj, gRect_class));
234
235    r->set(SkIntToScalar(env->GetIntField(obj, gRect_leftFieldID)),
236           SkIntToScalar(env->GetIntField(obj, gRect_topFieldID)),
237           SkIntToScalar(env->GetIntField(obj, gRect_rightFieldID)),
238           SkIntToScalar(env->GetIntField(obj, gRect_bottomFieldID)));
239    return r;
240}
241
242void GraphicsJNI::rect_to_jrectf(const SkRect& r, JNIEnv* env, jobject obj)
243{
244    SkASSERT(env->IsInstanceOf(obj, gRectF_class));
245
246    env->SetFloatField(obj, gRectF_leftFieldID, SkScalarToFloat(r.fLeft));
247    env->SetFloatField(obj, gRectF_topFieldID, SkScalarToFloat(r.fTop));
248    env->SetFloatField(obj, gRectF_rightFieldID, SkScalarToFloat(r.fRight));
249    env->SetFloatField(obj, gRectF_bottomFieldID, SkScalarToFloat(r.fBottom));
250}
251
252SkIPoint* GraphicsJNI::jpoint_to_ipoint(JNIEnv* env, jobject obj, SkIPoint* point)
253{
254    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
255
256    point->set(env->GetIntField(obj, gPoint_xFieldID),
257               env->GetIntField(obj, gPoint_yFieldID));
258    return point;
259}
260
261void GraphicsJNI::ipoint_to_jpoint(const SkIPoint& ir, JNIEnv* env, jobject obj)
262{
263    SkASSERT(env->IsInstanceOf(obj, gPoint_class));
264
265    env->SetIntField(obj, gPoint_xFieldID, ir.fX);
266    env->SetIntField(obj, gPoint_yFieldID, ir.fY);
267}
268
269SkPoint* GraphicsJNI::jpointf_to_point(JNIEnv* env, jobject obj, SkPoint* point)
270{
271    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
272
273    point->set(SkFloatToScalar(env->GetIntField(obj, gPointF_xFieldID)),
274               SkFloatToScalar(env->GetIntField(obj, gPointF_yFieldID)));
275    return point;
276}
277
278void GraphicsJNI::point_to_jpointf(const SkPoint& r, JNIEnv* env, jobject obj)
279{
280    SkASSERT(env->IsInstanceOf(obj, gPointF_class));
281
282    env->SetFloatField(obj, gPointF_xFieldID, SkScalarToFloat(r.fX));
283    env->SetFloatField(obj, gPointF_yFieldID, SkScalarToFloat(r.fY));
284}
285
286SkBitmap* GraphicsJNI::getNativeBitmap(JNIEnv* env, jobject bitmap) {
287    SkASSERT(env);
288    SkASSERT(bitmap);
289    SkASSERT(env->IsInstanceOf(bitmap, gBitmap_class));
290    SkBitmap* b = (SkBitmap*)env->GetIntField(bitmap, gBitmap_nativeInstanceID);
291    SkASSERT(b);
292    return b;
293}
294
295SkBitmap::Config GraphicsJNI::getNativeBitmapConfig(JNIEnv* env,
296                                                    jobject jconfig) {
297    SkASSERT(env);
298    if (NULL == jconfig) {
299        return SkBitmap::kNo_Config;
300    }
301    SkASSERT(env->IsInstanceOf(jconfig, gBitmapConfig_class));
302    int c = env->GetIntField(jconfig, gBitmapConfig_nativeInstanceID);
303    if (c < 0 || c >= SkBitmap::kConfigCount) {
304        c = SkBitmap::kNo_Config;
305    }
306    return static_cast<SkBitmap::Config>(c);
307}
308
309SkCanvas* GraphicsJNI::getNativeCanvas(JNIEnv* env, jobject canvas) {
310    SkASSERT(env);
311    SkASSERT(canvas);
312    SkASSERT(env->IsInstanceOf(canvas, gCanvas_class));
313    SkCanvas* c = (SkCanvas*)env->GetIntField(canvas, gCanvas_nativeInstanceID);
314    SkASSERT(c);
315    return c;
316}
317
318SkPaint* GraphicsJNI::getNativePaint(JNIEnv* env, jobject paint) {
319    SkASSERT(env);
320    SkASSERT(paint);
321    SkASSERT(env->IsInstanceOf(paint, gPaint_class));
322    SkPaint* p = (SkPaint*)env->GetIntField(paint, gPaint_nativeInstanceID);
323    SkASSERT(p);
324    return p;
325}
326
327SkPicture* GraphicsJNI::getNativePicture(JNIEnv* env, jobject picture)
328{
329    SkASSERT(env);
330    SkASSERT(picture);
331    SkASSERT(env->IsInstanceOf(picture, gPicture_class));
332    SkPicture* p = (SkPicture*)env->GetIntField(picture, gPicture_nativeInstanceID);
333    SkASSERT(p);
334    return p;
335}
336
337SkRegion* GraphicsJNI::getNativeRegion(JNIEnv* env, jobject region)
338{
339    SkASSERT(env);
340    SkASSERT(region);
341    SkASSERT(env->IsInstanceOf(region, gRegion_class));
342    SkRegion* r = (SkRegion*)env->GetIntField(region, gRegion_nativeInstanceID);
343    SkASSERT(r);
344    return r;
345}
346
347///////////////////////////////////////////////////////////////////////////////////////////
348
349jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, jbyteArray buffer,
350        int bitmapCreateFlags, jbyteArray ninepatch, jintArray layoutbounds, int density)
351{
352    SkASSERT(bitmap);
353    SkASSERT(bitmap->pixelRef());
354    bool isMutable = bitmapCreateFlags & kBitmapCreateFlag_Mutable;
355    bool isPremultiplied = bitmapCreateFlags & kBitmapCreateFlag_Premultiplied;
356
357    jobject obj = env->NewObject(gBitmap_class, gBitmap_constructorMethodID,
358            static_cast<jint>(reinterpret_cast<uintptr_t>(bitmap)), buffer,
359            bitmap->width(), bitmap->height(), density, isMutable, isPremultiplied,
360            ninepatch, layoutbounds);
361    hasException(env); // For the side effect of logging.
362    return obj;
363}
364
365jobject GraphicsJNI::createBitmap(JNIEnv* env, SkBitmap* bitmap, int bitmapCreateFlags,
366        jbyteArray ninepatch, int density)
367{
368    return createBitmap(env, bitmap, NULL, bitmapCreateFlags, ninepatch, NULL, density);
369}
370
371void GraphicsJNI::reinitBitmap(JNIEnv* env, jobject javaBitmap, SkBitmap* bitmap,
372        bool isPremultiplied)
373{
374    env->CallVoidMethod(javaBitmap, gBitmap_reinitMethodID,
375            bitmap->width(), bitmap->height(), isPremultiplied);
376}
377
378int GraphicsJNI::getBitmapAllocationByteCount(JNIEnv* env, jobject javaBitmap)
379{
380    return env->CallIntMethod(javaBitmap, gBitmap_getAllocationByteCountMethodID);
381}
382
383jobject GraphicsJNI::createBitmapRegionDecoder(JNIEnv* env, SkBitmapRegionDecoder* bitmap)
384{
385    SkASSERT(bitmap != NULL);
386
387    jobject obj = env->NewObject(gBitmapRegionDecoder_class,
388            gBitmapRegionDecoder_constructorMethodID,
389            static_cast<jint>(reinterpret_cast<uintptr_t>(bitmap)));
390    hasException(env); // For the side effect of logging.
391    return obj;
392}
393
394jobject GraphicsJNI::createRegion(JNIEnv* env, SkRegion* region)
395{
396    SkASSERT(region != NULL);
397    jobject obj = env->NewObject(gRegion_class, gRegion_constructorMethodID,
398            static_cast<jint>(reinterpret_cast<uintptr_t>(region)), 0);
399    hasException(env); // For the side effect of logging.
400    return obj;
401}
402
403static JNIEnv* vm2env(JavaVM* vm)
404{
405    JNIEnv* env = NULL;
406    if (vm->GetEnv((void**)&env, JNI_VERSION_1_4) != JNI_OK || NULL == env)
407    {
408        SkDebugf("------- [%p] vm->GetEnv() failed\n", vm);
409        sk_throw();
410    }
411    return env;
412}
413
414///////////////////////////////////////////////////////////////////////////////
415
416AndroidPixelRef::AndroidPixelRef(JNIEnv* env, void* storage, size_t size, jbyteArray storageObj,
417        SkColorTable* ctable) : SkMallocPixelRef(storage, size, ctable, (storageObj == NULL)),
418        fWrappedPixelRef(NULL) {
419    SkASSERT(storage);
420    SkASSERT(env);
421
422    if (env->GetJavaVM(&fVM) != JNI_OK) {
423        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
424        sk_throw();
425    }
426    fStorageObj = storageObj;
427    fHasGlobalRef = false;
428    fGlobalRefCnt = 0;
429
430    // If storageObj is NULL, the memory was NOT allocated on the Java heap
431    fOnJavaHeap = (storageObj != NULL);
432
433}
434
435AndroidPixelRef::AndroidPixelRef(AndroidPixelRef& wrappedPixelRef, SkColorTable* ctable) :
436        SkMallocPixelRef(wrappedPixelRef.getAddr(), wrappedPixelRef.getSize(), ctable, false),
437        fWrappedPixelRef(wrappedPixelRef.fWrappedPixelRef ?
438            wrappedPixelRef.fWrappedPixelRef : &wrappedPixelRef)
439{
440    SkASSERT(fWrappedPixelRef);
441    SkSafeRef(fWrappedPixelRef);
442
443    // don't need to initialize these, as all the relevant logic delegates to the wrapped ref
444    fStorageObj = NULL;
445    fHasGlobalRef = false;
446    fGlobalRefCnt = 0;
447    fOnJavaHeap = false;
448}
449
450AndroidPixelRef::~AndroidPixelRef() {
451    if (fWrappedPixelRef) {
452        SkSafeUnref(fWrappedPixelRef);
453    } else if (fOnJavaHeap) {
454        JNIEnv* env = vm2env(fVM);
455
456        if (fStorageObj && fHasGlobalRef) {
457            env->DeleteGlobalRef(fStorageObj);
458        }
459        fStorageObj = NULL;
460    }
461}
462jbyteArray AndroidPixelRef::getStorageObj() {
463    if (fWrappedPixelRef) {
464        return fWrappedPixelRef->fStorageObj;
465    }
466    return fStorageObj;
467}
468
469void AndroidPixelRef::setLocalJNIRef(jbyteArray arr) {
470    if (fWrappedPixelRef) {
471        // delegate java obj management to the wrapped ref
472        fWrappedPixelRef->setLocalJNIRef(arr);
473    } else if (!fHasGlobalRef) {
474        fStorageObj = arr;
475    }
476}
477
478void AndroidPixelRef::globalRef(void* localref) {
479    if (fWrappedPixelRef) {
480        // delegate java obj management to the wrapped ref
481        fWrappedPixelRef->globalRef(localref);
482
483        // Note: we only ref and unref the wrapped AndroidPixelRef so that
484        // bitmap->pixelRef()->globalRef() and globalUnref() can be used in a pair, even if
485        // the bitmap has its underlying AndroidPixelRef swapped out/wrapped
486        return;
487    }
488    if (fOnJavaHeap && sk_atomic_inc(&fGlobalRefCnt) == 0) {
489        JNIEnv *env = vm2env(fVM);
490
491        // If JNI ref was passed, it is always used
492        if (localref) fStorageObj = (jbyteArray) localref;
493
494        if (fStorageObj == NULL) {
495            SkDebugf("No valid local ref to create a JNI global ref\n");
496            sk_throw();
497        }
498        if (fHasGlobalRef) {
499            // This should never happen
500            SkDebugf("Already holding a JNI global ref");
501            sk_throw();
502        }
503
504        fStorageObj = (jbyteArray) env->NewGlobalRef(fStorageObj);
505        // TODO: Check for failure here
506        fHasGlobalRef = true;
507    }
508    ref();
509}
510
511void AndroidPixelRef::globalUnref() {
512    if (fWrappedPixelRef) {
513        // delegate java obj management to the wrapped ref
514        fWrappedPixelRef->globalUnref();
515        return;
516    }
517    if (fOnJavaHeap && sk_atomic_dec(&fGlobalRefCnt) == 1) {
518        JNIEnv *env = vm2env(fVM);
519        if (!fHasGlobalRef) {
520            SkDebugf("We don't have a global ref!");
521            sk_throw();
522        }
523        env->DeleteGlobalRef(fStorageObj);
524        fStorageObj = NULL;
525        fHasGlobalRef = false;
526    }
527    unref();
528}
529
530///////////////////////////////////////////////////////////////////////////////
531
532extern "C" jbyte* jniGetNonMovableArrayElements(C_JNIEnv* env, jarray arrayObj);
533
534jbyteArray GraphicsJNI::allocateJavaPixelRef(JNIEnv* env, SkBitmap* bitmap,
535                                             SkColorTable* ctable) {
536    Sk64 size64 = bitmap->getSize64();
537    if (size64.isNeg() || !size64.is32()) {
538        jniThrowException(env, "java/lang/IllegalArgumentException",
539                          "bitmap size exceeds 32bits");
540        return NULL;
541    }
542
543    size_t size = size64.get32();
544    jbyteArray arrayObj = env->NewByteArray(size);
545    if (arrayObj) {
546        // TODO: make this work without jniGetNonMovableArrayElements
547        jbyte* addr = jniGetNonMovableArrayElements(&env->functions, arrayObj);
548        if (addr) {
549            SkPixelRef* pr = new AndroidPixelRef(env, (void*) addr, size, arrayObj, ctable);
550            bitmap->setPixelRef(pr)->unref();
551            // since we're already allocated, we lockPixels right away
552            // HeapAllocator behaves this way too
553            bitmap->lockPixels();
554        }
555    }
556
557    return arrayObj;
558}
559
560///////////////////////////////////////////////////////////////////////////////
561
562JavaPixelAllocator::JavaPixelAllocator(JNIEnv* env)
563    : fStorageObj(NULL),
564      fAllocCount(0) {
565    if (env->GetJavaVM(&fVM) != JNI_OK) {
566        SkDebugf("------ [%p] env->GetJavaVM failed\n", env);
567        sk_throw();
568    }
569}
570
571bool JavaPixelAllocator::allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable) {
572    JNIEnv* env = vm2env(fVM);
573
574    fStorageObj = GraphicsJNI::allocateJavaPixelRef(env, bitmap, ctable);
575    fAllocCount += 1;
576    return fStorageObj != NULL;
577}
578
579////////////////////////////////////////////////////////////////////////////////
580
581JavaHeapBitmapRef::JavaHeapBitmapRef(JNIEnv* env, SkBitmap* nativeBitmap, jbyteArray buffer) {
582    fEnv = env;
583    fNativeBitmap = nativeBitmap;
584    fBuffer = buffer;
585
586    // If the buffer is NULL, the backing memory wasn't allocated on the Java heap
587    if (fBuffer) {
588        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(fBuffer);
589    }
590}
591
592JavaHeapBitmapRef::~JavaHeapBitmapRef() {
593    if (fBuffer) {
594        ((AndroidPixelRef*) fNativeBitmap->pixelRef())->setLocalJNIRef(NULL);
595    }
596}
597
598////////////////////////////////////////////////////////////////////////////////
599
600static jclass make_globalref(JNIEnv* env, const char classname[])
601{
602    jclass c = env->FindClass(classname);
603    SkASSERT(c);
604    return (jclass)env->NewGlobalRef(c);
605}
606
607static jfieldID getFieldIDCheck(JNIEnv* env, jclass clazz,
608                                const char fieldname[], const char type[])
609{
610    jfieldID id = env->GetFieldID(clazz, fieldname, type);
611    SkASSERT(id);
612    return id;
613}
614
615int register_android_graphics_Graphics(JNIEnv* env)
616{
617    jmethodID m;
618    jclass c;
619
620    gRect_class = make_globalref(env, "android/graphics/Rect");
621    gRect_leftFieldID = getFieldIDCheck(env, gRect_class, "left", "I");
622    gRect_topFieldID = getFieldIDCheck(env, gRect_class, "top", "I");
623    gRect_rightFieldID = getFieldIDCheck(env, gRect_class, "right", "I");
624    gRect_bottomFieldID = getFieldIDCheck(env, gRect_class, "bottom", "I");
625
626    gRectF_class = make_globalref(env, "android/graphics/RectF");
627    gRectF_leftFieldID = getFieldIDCheck(env, gRectF_class, "left", "F");
628    gRectF_topFieldID = getFieldIDCheck(env, gRectF_class, "top", "F");
629    gRectF_rightFieldID = getFieldIDCheck(env, gRectF_class, "right", "F");
630    gRectF_bottomFieldID = getFieldIDCheck(env, gRectF_class, "bottom", "F");
631
632    gPoint_class = make_globalref(env, "android/graphics/Point");
633    gPoint_xFieldID = getFieldIDCheck(env, gPoint_class, "x", "I");
634    gPoint_yFieldID = getFieldIDCheck(env, gPoint_class, "y", "I");
635
636    gPointF_class = make_globalref(env, "android/graphics/PointF");
637    gPointF_xFieldID = getFieldIDCheck(env, gPointF_class, "x", "F");
638    gPointF_yFieldID = getFieldIDCheck(env, gPointF_class, "y", "F");
639
640    gBitmap_class = make_globalref(env, "android/graphics/Bitmap");
641    gBitmap_nativeInstanceID = getFieldIDCheck(env, gBitmap_class, "mNativeBitmap", "I");
642    gBitmap_constructorMethodID = env->GetMethodID(gBitmap_class, "<init>", "(I[BIIIZZ[B[I)V");
643    gBitmap_reinitMethodID = env->GetMethodID(gBitmap_class, "reinit", "(IIZ)V");
644    gBitmap_getAllocationByteCountMethodID = env->GetMethodID(gBitmap_class, "getAllocationByteCount", "()I");
645    gBitmapRegionDecoder_class = make_globalref(env, "android/graphics/BitmapRegionDecoder");
646    gBitmapRegionDecoder_constructorMethodID = env->GetMethodID(gBitmapRegionDecoder_class, "<init>", "(I)V");
647
648    gBitmapConfig_class = make_globalref(env, "android/graphics/Bitmap$Config");
649    gBitmapConfig_nativeInstanceID = getFieldIDCheck(env, gBitmapConfig_class,
650                                                     "nativeInt", "I");
651
652    gCanvas_class = make_globalref(env, "android/graphics/Canvas");
653    gCanvas_nativeInstanceID = getFieldIDCheck(env, gCanvas_class, "mNativeCanvas", "I");
654
655    gPaint_class = make_globalref(env, "android/graphics/Paint");
656    gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "I");
657
658    gPicture_class = make_globalref(env, "android/graphics/Picture");
659    gPicture_nativeInstanceID = getFieldIDCheck(env, gPicture_class, "mNativePicture", "I");
660
661    gRegion_class = make_globalref(env, "android/graphics/Region");
662    gRegion_nativeInstanceID = getFieldIDCheck(env, gRegion_class, "mNativeRegion", "I");
663    gRegion_constructorMethodID = env->GetMethodID(gRegion_class, "<init>",
664        "(II)V");
665
666    return 0;
667}
668