android_view_GLES20Canvas.cpp revision 5977baa1fa24125c148a72699b53e62abaf08960 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "OpenGLRenderer"
18
19#include "jni.h"
20#include "GraphicsJNI.h"
21#include <nativehelper/JNIHelp.h>
22#include <android_runtime/AndroidRuntime.h>
23#include <utils/ResourceTypes.h>
24
25#include <SkBitmap.h>
26#include <SkCanvas.h>
27#include <SkMatrix.h>
28#include <SkPaint.h>
29#include <SkRegion.h>
30#include <SkScalerContext.h>
31#include <SkTemplates.h>
32#include <SkXfermode.h>
33
34#include <DisplayListRenderer.h>
35#include <OpenGLDebugRenderer.h>
36#include <OpenGLRenderer.h>
37#include <SkiaShader.h>
38#include <SkiaColorFilter.h>
39#include <Rect.h>
40
41#include "TextLayout.h"
42
43namespace android {
44
45using namespace uirenderer;
46
47/**
48 * Note: OpenGLRenderer JNI layer is generated and compiled only on supported
49 *       devices. This means all the logic must be compiled only when the
50 *       preprocessor variable USE_OPENGL_RENDERER is defined.
51 */
52#ifdef USE_OPENGL_RENDERER
53
54///////////////////////////////////////////////////////////////////////////////
55// Defines
56///////////////////////////////////////////////////////////////////////////////
57
58// Debug
59#define DEBUG_RENDERER 0
60#define PROFILE_RENDERER 0
61
62// Debug
63#if DEBUG_RENDERER
64    #define RENDERER_LOGD(...) LOGD(__VA_ARGS__)
65#else
66    #define RENDERER_LOGD(...)
67#endif
68
69// ----------------------------------------------------------------------------
70
71static struct {
72    jclass clazz;
73    jmethodID set;
74} gRectClassInfo;
75
76// ----------------------------------------------------------------------------
77// Constructors
78// ----------------------------------------------------------------------------
79
80static OpenGLRenderer* android_view_GLES20Canvas_createRenderer(JNIEnv* env, jobject canvas) {
81    RENDERER_LOGD("Create OpenGLRenderer");
82#if PROFILE_RENDERER
83    return new OpenGLDebugRenderer;
84#else
85    return new OpenGLRenderer;
86#endif
87}
88
89static void android_view_GLES20Canvas_destroyRenderer(JNIEnv* env, jobject clazz,
90        OpenGLRenderer* renderer) {
91    RENDERER_LOGD("Destroy OpenGLRenderer");
92    delete renderer;
93}
94
95// ----------------------------------------------------------------------------
96// Setup
97// ----------------------------------------------------------------------------
98
99static void android_view_GLES20Canvas_setViewport(JNIEnv* env, jobject canvas,
100        OpenGLRenderer* renderer, jint width, jint height) {
101    renderer->setViewport(width, height);
102}
103
104static void android_view_GLES20Canvas_prepare(JNIEnv* env, jobject canvas,
105        OpenGLRenderer* renderer, jboolean opaque) {
106    renderer->prepare(opaque);
107}
108
109static void android_view_GLES20Canvas_finish(JNIEnv* env, jobject canvas,
110        OpenGLRenderer* renderer) {
111    renderer->finish();
112}
113
114static void android_view_GLES20Canvas_acquireContext(JNIEnv* env, jobject canvas,
115        OpenGLRenderer* renderer) {
116    renderer->acquireContext();
117}
118
119static void android_view_GLES20Canvas_releaseContext(JNIEnv* env, jobject canvas,
120        OpenGLRenderer* renderer) {
121    renderer->releaseContext();
122}
123
124// ----------------------------------------------------------------------------
125// State
126// ----------------------------------------------------------------------------
127
128static jint android_view_GLES20Canvas_save(JNIEnv* env, jobject canvas, OpenGLRenderer* renderer,
129        jint flags) {
130    return renderer->save(flags);
131}
132
133static jint android_view_GLES20Canvas_getSaveCount(JNIEnv* env, jobject canvas,
134        OpenGLRenderer* renderer) {
135    return renderer->getSaveCount();
136}
137
138static void android_view_GLES20Canvas_restore(JNIEnv* env, jobject canvas,
139        OpenGLRenderer* renderer) {
140    renderer->restore();
141}
142
143static void android_view_GLES20Canvas_restoreToCount(JNIEnv* env, jobject canvas,
144        OpenGLRenderer* renderer, jint saveCount) {
145    renderer->restoreToCount(saveCount);
146}
147
148// ----------------------------------------------------------------------------
149// Layers
150// ----------------------------------------------------------------------------
151
152static jint android_view_GLES20Canvas_saveLayer(JNIEnv* env, jobject canvas,
153        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
154        SkPaint* paint, jint saveFlags) {
155    return renderer->saveLayer(left, top, right, bottom, paint, saveFlags);
156}
157
158static jint android_view_GLES20Canvas_saveLayerAlpha(JNIEnv* env, jobject canvas,
159        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
160        jint alpha, jint saveFlags) {
161    return renderer->saveLayerAlpha(left, top, right, bottom, alpha, saveFlags);
162}
163
164// ----------------------------------------------------------------------------
165// Clipping
166// ----------------------------------------------------------------------------
167
168static bool android_view_GLES20Canvas_quickReject(JNIEnv* env, jobject canvas,
169        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
170        SkCanvas::EdgeType edge) {
171    return renderer->quickReject(left, top, right, bottom);
172}
173
174static bool android_view_GLES20Canvas_clipRectF(JNIEnv* env, jobject canvas,
175        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
176        SkRegion::Op op) {
177    return renderer->clipRect(left, top, right, bottom, op);
178}
179
180static bool android_view_GLES20Canvas_clipRect(JNIEnv* env, jobject canvas,
181        OpenGLRenderer* renderer, jint left, jint top, jint right, jint bottom,
182        SkRegion::Op op) {
183    return renderer->clipRect(float(left), float(top), float(right), float(bottom), op);
184}
185
186static bool android_view_GLES20Canvas_getClipBounds(JNIEnv* env, jobject canvas,
187        OpenGLRenderer* renderer, jobject rect) {
188    const android::uirenderer::Rect& bounds(renderer->getClipBounds());
189
190    env->CallVoidMethod(rect, gRectClassInfo.set,
191            int(bounds.left), int(bounds.top), int(bounds.right), int(bounds.bottom));
192
193    return !bounds.isEmpty();
194}
195
196// ----------------------------------------------------------------------------
197// Transforms
198// ----------------------------------------------------------------------------
199
200static void android_view_GLES20Canvas_translate(JNIEnv* env, jobject canvas,
201        OpenGLRenderer* renderer, jfloat dx, jfloat dy) {
202    renderer->translate(dx, dy);
203}
204
205static void android_view_GLES20Canvas_rotate(JNIEnv* env, jobject canvas,
206        OpenGLRenderer* renderer, jfloat degrees) {
207    renderer->rotate(degrees);
208}
209
210static void android_view_GLES20Canvas_scale(JNIEnv* env, jobject canvas,
211        OpenGLRenderer* renderer, jfloat sx, jfloat sy) {
212    renderer->scale(sx, sy);
213}
214
215static void android_view_GLES20Canvas_setMatrix(JNIEnv* env, jobject canvas,
216        OpenGLRenderer* renderer, SkMatrix* matrix) {
217    renderer->setMatrix(matrix);
218}
219
220static const float* android_view_GLES20Canvas_getNativeMatrix(JNIEnv* env,
221        jobject canvas, OpenGLRenderer* renderer) {
222    return renderer->getMatrix();
223}
224
225static void android_view_GLES20Canvas_getMatrix(JNIEnv* env, jobject canvas,
226        OpenGLRenderer* renderer, SkMatrix* matrix) {
227    renderer->getMatrix(matrix);
228}
229
230static void android_view_GLES20Canvas_concatMatrix(JNIEnv* env, jobject canvas,
231        OpenGLRenderer* renderer, SkMatrix* matrix) {
232    renderer->concatMatrix(matrix);
233}
234
235// ----------------------------------------------------------------------------
236// Drawing
237// ----------------------------------------------------------------------------
238
239static void android_view_GLES20Canvas_drawBitmap(JNIEnv* env, jobject canvas,
240        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray buffer, float left,
241        float top, SkPaint* paint) {
242    // This object allows the renderer to allocate a global JNI ref to the buffer object.
243    JavaHeapBitmapRef bitmapRef(env, bitmap, buffer);
244
245    renderer->drawBitmap(bitmap, left, top, paint);
246}
247
248static void android_view_GLES20Canvas_drawBitmapRect(JNIEnv* env, jobject canvas,
249        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray buffer,
250        float srcLeft, float srcTop, float srcRight, float srcBottom,
251        float dstLeft, float dstTop, float dstRight, float dstBottom, SkPaint* paint) {
252    // This object allows the renderer to allocate a global JNI ref to the buffer object.
253    JavaHeapBitmapRef bitmapRef(env, bitmap, buffer);
254
255    renderer->drawBitmap(bitmap, srcLeft, srcTop, srcRight, srcBottom,
256            dstLeft, dstTop, dstRight, dstBottom, paint);
257}
258
259static void android_view_GLES20Canvas_drawBitmapMatrix(JNIEnv* env, jobject canvas,
260        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray buffer, SkMatrix* matrix,
261        SkPaint* paint) {
262    // This object allows the renderer to allocate a global JNI ref to the buffer object.
263    JavaHeapBitmapRef bitmapRef(env, bitmap, buffer);
264
265    renderer->drawBitmap(bitmap, matrix, paint);
266}
267
268static void android_view_GLES20Canvas_drawPatch(JNIEnv* env, jobject canvas,
269        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray buffer, jbyteArray chunks,
270        float left, float top, float right, float bottom, SkPaint* paint) {
271    // This object allows the renderer to allocate a global JNI ref to the buffer object.
272    JavaHeapBitmapRef bitmapRef(env, bitmap, buffer);
273
274    jbyte* storage = env->GetByteArrayElements(chunks, NULL);
275    Res_png_9patch* patch = reinterpret_cast<Res_png_9patch*>(storage);
276    Res_png_9patch::deserialize(patch);
277
278    renderer->drawPatch(bitmap, &patch->xDivs[0], &patch->yDivs[0],
279            &patch->colors[0], patch->numXDivs, patch->numYDivs, patch->numColors,
280            left, top, right, bottom, paint);
281
282    env->ReleaseByteArrayElements(chunks, storage, 0);
283}
284
285static void android_view_GLES20Canvas_drawColor(JNIEnv* env, jobject canvas,
286        OpenGLRenderer* renderer, jint color, SkXfermode::Mode mode) {
287    renderer->drawColor(color, mode);
288}
289
290static void android_view_GLES20Canvas_drawRect(JNIEnv* env, jobject canvas,
291        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
292        SkPaint* paint) {
293    renderer->drawRect(left, top, right, bottom, paint);
294}
295
296static void android_view_GLES20Canvas_drawRects(JNIEnv* env, jobject canvas,
297        OpenGLRenderer* renderer, SkRegion* region, SkPaint* paint) {
298    SkRegion::Iterator it(*region);
299    while (!it.done()) {
300        const SkIRect& r = it.rect();
301        renderer->drawRect(r.fLeft, r.fTop, r.fRight, r.fBottom, paint);
302        it.next();
303    }
304}
305
306static void android_view_GLES20Canvas_drawPath(JNIEnv* env, jobject canvas,
307        OpenGLRenderer* renderer, SkPath* path, SkPaint* paint) {
308    renderer->drawPath(path, paint);
309}
310
311static void android_view_GLES20Canvas_drawLines(JNIEnv* env, jobject canvas,
312        OpenGLRenderer* renderer, jfloatArray points, jint offset, jint count, SkPaint* paint) {
313    jfloat* storage = env->GetFloatArrayElements(points, NULL);
314
315    renderer->drawLines(storage + offset, count, paint);
316
317    env->ReleaseFloatArrayElements(points, storage, 0);
318}
319
320// ----------------------------------------------------------------------------
321// Shaders and color filters
322// ----------------------------------------------------------------------------
323
324static void android_view_GLES20Canvas_resetModifiers(JNIEnv* env, jobject canvas,
325        OpenGLRenderer* renderer) {
326    renderer->resetShader();
327    renderer->resetColorFilter();
328    renderer->resetShadow();
329}
330
331static void android_view_GLES20Canvas_setupShader(JNIEnv* env, jobject canvas,
332        OpenGLRenderer* renderer, SkiaShader* shader) {
333    renderer->setupShader(shader);
334}
335
336static void android_view_GLES20Canvas_setupColorFilter(JNIEnv* env, jobject canvas,
337        OpenGLRenderer* renderer, SkiaColorFilter* filter) {
338    renderer->setupColorFilter(filter);
339}
340
341static void android_view_GLES20Canvas_setupShadow(JNIEnv* env, jobject canvas,
342        OpenGLRenderer* renderer, jfloat radius, jfloat dx, jfloat dy, jint color) {
343    renderer->setupShadow(radius, dx, dy, color);
344}
345
346// ----------------------------------------------------------------------------
347// Text
348// ----------------------------------------------------------------------------
349
350static void renderText(OpenGLRenderer* renderer, const jchar* text, int count,
351        jfloat x, jfloat y, int flags, SkPaint* paint) {
352    const jchar *workText;
353    jchar* buffer = NULL;
354    int32_t workBytes;
355    if (TextLayout::prepareText(paint, text, count, flags, &workText, &workBytes, &buffer)) {
356        renderer->drawText((const char*) workText, workBytes, count, x, y, paint);
357        free(buffer);
358    }
359}
360
361static void renderTextRun(OpenGLRenderer* renderer, const jchar* text,
362        jint start, jint count, jint contextCount, jfloat x, jfloat y,
363        int flags, SkPaint* paint) {
364    uint8_t rtl = flags & 0x1;
365    if (rtl) {
366        SkAutoSTMalloc<80, jchar> buffer(contextCount);
367        jchar* shaped = buffer.get();
368        if (TextLayout::prepareRtlTextRun(text, start, count, contextCount, shaped)) {
369            renderer->drawText((const char*) shaped, count << 1, count, x, y, paint);
370        } else {
371            LOGW("drawTextRun error");
372        }
373    } else {
374        renderer->drawText((const char*) (text + start), count << 1, count, x, y, paint);
375    }
376}
377
378static void android_view_GLES20Canvas_drawTextArray(JNIEnv* env, jobject canvas,
379        OpenGLRenderer* renderer, jcharArray text, int index, int count,
380        jfloat x, jfloat y, int flags, SkPaint* paint) {
381    jchar* textArray = env->GetCharArrayElements(text, NULL);
382    renderText(renderer, textArray + index, count, x, y, flags, paint);
383    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
384}
385
386static void android_view_GLES20Canvas_drawText(JNIEnv* env, jobject canvas,
387        OpenGLRenderer* renderer, jstring text, int start, int end,
388        jfloat x, jfloat y, int flags, SkPaint* paint) {
389    const jchar* textArray = env->GetStringChars(text, NULL);
390    renderText(renderer, textArray + start, end - start, x, y, flags, paint);
391    env->ReleaseStringChars(text, textArray);
392}
393
394static void android_view_GLES20Canvas_drawTextRunArray(JNIEnv* env, jobject canvas,
395        OpenGLRenderer* renderer, jcharArray text, int index, int count,
396        int contextIndex, int contextCount, jfloat x, jfloat y, int dirFlags,
397        SkPaint* paint) {
398    jchar* textArray = env->GetCharArrayElements(text, NULL);
399    renderTextRun(renderer, textArray + contextIndex, index - contextIndex,
400            count, contextCount, x, y, dirFlags, paint);
401    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
402 }
403
404static void android_view_GLES20Canvas_drawTextRun(JNIEnv* env, jobject canvas,
405        OpenGLRenderer* renderer, jstring text, int start, int end,
406        int contextStart, int contextEnd, jfloat x, jfloat y, int dirFlags,
407        SkPaint* paint) {
408    const jchar* textArray = env->GetStringChars(text, NULL);
409    jint count = end - start;
410    jint contextCount = contextEnd - contextStart;
411    renderTextRun(renderer, textArray + contextStart, start - contextStart,
412            count, contextCount, x, y, dirFlags, paint);
413    env->ReleaseStringChars(text, textArray);
414}
415
416// ----------------------------------------------------------------------------
417// Display lists
418// ----------------------------------------------------------------------------
419
420static DisplayList* android_view_GLES20Canvas_getDisplayList(JNIEnv* env,
421        jobject canvas, DisplayListRenderer* renderer) {
422    return renderer->getDisplayList();
423}
424
425static OpenGLRenderer* android_view_GLES20Canvas_getDisplayListRenderer(JNIEnv* env,
426        jobject clazz, DisplayListRenderer* renderer) {
427    if (renderer == NULL) {
428        renderer = new DisplayListRenderer;
429    } else {
430        renderer->reset();
431    }
432    return renderer;
433}
434
435static void android_view_GLES20Canvas_destroyDisplayList(JNIEnv* env,
436        jobject clazz, DisplayList* displayList) {
437    delete displayList;
438}
439
440static void android_view_GLES20Canvas_drawDisplayList(JNIEnv* env,
441        jobject canvas, OpenGLRenderer* renderer, DisplayList* displayList) {
442    renderer->drawDisplayList(displayList);
443}
444
445#endif // USE_OPENGL_RENDERER
446
447// ----------------------------------------------------------------------------
448// Common
449// ----------------------------------------------------------------------------
450
451static jboolean android_view_GLES20Canvas_isAvailable(JNIEnv* env, jobject clazz) {
452#ifdef USE_OPENGL_RENDERER
453    return JNI_TRUE;
454#else
455    return JNI_FALSE;
456#endif
457}
458
459// ----------------------------------------------------------------------------
460// JNI Glue
461// ----------------------------------------------------------------------------
462
463const char* const kClassPathName = "android/view/GLES20Canvas";
464
465static JNINativeMethod gMethods[] = {
466    { "nIsAvailable",       "()Z",             (void*) android_view_GLES20Canvas_isAvailable },
467
468#ifdef USE_OPENGL_RENDERER
469    { "nCreateRenderer",    "()I",             (void*) android_view_GLES20Canvas_createRenderer },
470    { "nDestroyRenderer",   "(I)V",            (void*) android_view_GLES20Canvas_destroyRenderer },
471    { "nSetViewport",       "(III)V",          (void*) android_view_GLES20Canvas_setViewport },
472    { "nPrepare",           "(IZ)V",           (void*) android_view_GLES20Canvas_prepare },
473    { "nFinish",            "(I)V",            (void*) android_view_GLES20Canvas_finish },
474    { "nAcquireContext",    "(I)V",            (void*) android_view_GLES20Canvas_acquireContext },
475    { "nReleaseContext",    "(I)V",            (void*) android_view_GLES20Canvas_releaseContext },
476
477    { "nSave",              "(II)I",           (void*) android_view_GLES20Canvas_save },
478    { "nRestore",           "(I)V",            (void*) android_view_GLES20Canvas_restore },
479    { "nRestoreToCount",    "(II)V",           (void*) android_view_GLES20Canvas_restoreToCount },
480    { "nGetSaveCount",      "(I)I",            (void*) android_view_GLES20Canvas_getSaveCount },
481
482    { "nSaveLayer",         "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayer },
483    { "nSaveLayerAlpha",    "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayerAlpha },
484
485    { "nQuickReject",       "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_quickReject },
486    { "nClipRect",          "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_clipRectF },
487    { "nClipRect",          "(IIIIII)Z",       (void*) android_view_GLES20Canvas_clipRect },
488
489    { "nTranslate",         "(IFF)V",          (void*) android_view_GLES20Canvas_translate },
490    { "nRotate",            "(IF)V",           (void*) android_view_GLES20Canvas_rotate },
491    { "nScale",             "(IFF)V",          (void*) android_view_GLES20Canvas_scale },
492
493    { "nSetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_setMatrix },
494    { "nGetMatrix",         "(I)I",            (void*) android_view_GLES20Canvas_getNativeMatrix },
495    { "nGetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_getMatrix },
496    { "nConcatMatrix",      "(II)V",           (void*) android_view_GLES20Canvas_concatMatrix },
497
498    { "nDrawBitmap",        "(II[BFFI)V", (void*) android_view_GLES20Canvas_drawBitmap },
499    { "nDrawBitmap",        "(II[BFFFFFFFFI)V", (void*) android_view_GLES20Canvas_drawBitmapRect },
500    { "nDrawBitmap",        "(II[BII)V", (void*) android_view_GLES20Canvas_drawBitmapMatrix },
501    { "nDrawPatch",         "(II[B[BFFFFI)V", (void*) android_view_GLES20Canvas_drawPatch },
502
503    { "nDrawColor",         "(III)V",          (void*) android_view_GLES20Canvas_drawColor },
504    { "nDrawRect",          "(IFFFFI)V",       (void*) android_view_GLES20Canvas_drawRect },
505    { "nDrawRects",         "(III)V",          (void*) android_view_GLES20Canvas_drawRects },
506    { "nDrawPath",          "(III)V",          (void*) android_view_GLES20Canvas_drawPath },
507    { "nDrawLines",         "(I[FIII)V",       (void*) android_view_GLES20Canvas_drawLines },
508
509    { "nResetModifiers",    "(I)V",            (void*) android_view_GLES20Canvas_resetModifiers },
510    { "nSetupShader",       "(II)V",           (void*) android_view_GLES20Canvas_setupShader },
511    { "nSetupColorFilter",  "(II)V",           (void*) android_view_GLES20Canvas_setupColorFilter },
512    { "nSetupShadow",       "(IFFFI)V",        (void*) android_view_GLES20Canvas_setupShadow },
513
514    { "nDrawText",          "(I[CIIFFII)V",    (void*) android_view_GLES20Canvas_drawTextArray },
515    { "nDrawText",          "(ILjava/lang/String;IIFFII)V",
516            (void*) android_view_GLES20Canvas_drawText },
517
518    { "nDrawTextRun",       "(I[CIIIIFFII)V",  (void*) android_view_GLES20Canvas_drawTextRunArray },
519    { "nDrawTextRun",       "(ILjava/lang/String;IIIIFFII)V",
520            (void*) android_view_GLES20Canvas_drawTextRun },
521
522    { "nGetClipBounds",     "(ILandroid/graphics/Rect;)Z",
523            (void*) android_view_GLES20Canvas_getClipBounds },
524
525    { "nGetDisplayList",  "(I)I",           (void*) android_view_GLES20Canvas_getDisplayList },
526    { "nDestroyDisplayList", "(I)V",           (void*) android_view_GLES20Canvas_destroyDisplayList },
527    { "nGetDisplayListRenderer", "(I)I",     (void*) android_view_GLES20Canvas_getDisplayListRenderer },
528    { "nDrawDisplayList",    "(II)V",          (void*) android_view_GLES20Canvas_drawDisplayList },
529
530#endif
531};
532
533#ifdef USE_OPENGL_RENDERER
534    #define FIND_CLASS(var, className) \
535            var = env->FindClass(className); \
536            LOG_FATAL_IF(! var, "Unable to find class " className); \
537            var = jclass(env->NewGlobalRef(var));
538
539    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
540            var = env->GetMethodID(clazz, methodName, methodDescriptor); \
541            LOG_FATAL_IF(! var, "Unable to find method " methodName);
542#else
543    #define FIND_CLASS(var, className)
544    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor)
545#endif
546
547int register_android_view_GLES20Canvas(JNIEnv* env) {
548    FIND_CLASS(gRectClassInfo.clazz, "android/graphics/Rect");
549    GET_METHOD_ID(gRectClassInfo.set, gRectClassInfo.clazz, "set", "(IIII)V");
550
551    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
552}
553
554};
555