SurfaceTexture.cpp revision f09263e957a3f132899458fc5afe859ba9d62d2e 
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 "SurfaceTexture"
18
19#include <stdio.h>
20
21#include <gui/SurfaceTexture.h>
22#include <gui/SurfaceTextureClient.h>
23
24#include <android_runtime/AndroidRuntime.h>
25
26#include <utils/Log.h>
27#include <utils/misc.h>
28
29#include "jni.h"
30#include "JNIHelp.h"
31
32// ----------------------------------------------------------------------------
33
34namespace android {
35
36static const char* const OutOfResourcesException =
37    "android/graphics/SurfaceTexture$OutOfResourcesException";
38static const char* const IllegalStateException = "java/lang/IllegalStateException";
39const char* const kSurfaceTextureClassPathName = "android/graphics/SurfaceTexture";
40
41struct fields_t {
42    jfieldID  surfaceTexture;
43    jmethodID postEvent;
44};
45static fields_t fields;
46
47// ----------------------------------------------------------------------------
48
49static void SurfaceTexture_setSurfaceTexture(JNIEnv* env, jobject thiz,
50        const sp<SurfaceTexture>& surfaceTexture)
51{
52    SurfaceTexture* const p =
53        (SurfaceTexture*)env->GetIntField(thiz, fields.surfaceTexture);
54    if (surfaceTexture.get()) {
55        surfaceTexture->incStrong(thiz);
56    }
57    if (p) {
58        p->decStrong(thiz);
59    }
60    env->SetIntField(thiz, fields.surfaceTexture, (int)surfaceTexture.get());
61}
62
63sp<SurfaceTexture> SurfaceTexture_getSurfaceTexture(JNIEnv* env, jobject thiz)
64{
65    sp<SurfaceTexture> surfaceTexture(
66        (SurfaceTexture*)env->GetIntField(thiz, fields.surfaceTexture));
67    return surfaceTexture;
68}
69
70sp<ANativeWindow> android_SurfaceTexture_getNativeWindow(
71        JNIEnv* env, jobject thiz)
72{
73    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
74    sp<SurfaceTextureClient> surfaceTextureClient(surfaceTexture != NULL ?
75            new SurfaceTextureClient(surfaceTexture) : NULL);
76    return surfaceTextureClient;
77}
78
79bool android_SurfaceTexture_isInstanceOf(JNIEnv* env, jobject thiz)
80{
81    jclass surfaceTextureClass = env->FindClass(kSurfaceTextureClassPathName);
82    return env->IsInstanceOf(thiz, surfaceTextureClass);
83}
84
85// ----------------------------------------------------------------------------
86
87class JNISurfaceTextureContext : public SurfaceTexture::FrameAvailableListener
88{
89public:
90    JNISurfaceTextureContext(JNIEnv* env, jobject weakThiz, jclass clazz);
91    virtual ~JNISurfaceTextureContext();
92    virtual void onFrameAvailable();
93
94private:
95    static JNIEnv* getJNIEnv(bool* needsDetach);
96    static void detachJNI();
97
98    jobject mWeakThiz;
99    jclass mClazz;
100};
101
102JNISurfaceTextureContext::JNISurfaceTextureContext(JNIEnv* env,
103        jobject weakThiz, jclass clazz) :
104    mWeakThiz(env->NewGlobalRef(weakThiz)),
105    mClazz((jclass)env->NewGlobalRef(clazz))
106{}
107
108JNIEnv* JNISurfaceTextureContext::getJNIEnv(bool* needsDetach) {
109    *needsDetach = false;
110    JNIEnv* env = AndroidRuntime::getJNIEnv();
111    if (env == NULL) {
112        JavaVMAttachArgs args = {JNI_VERSION_1_4, NULL, NULL};
113        JavaVM* vm = AndroidRuntime::getJavaVM();
114        int result = vm->AttachCurrentThread(&env, (void*) &args);
115        if (result != JNI_OK) {
116            ALOGE("thread attach failed: %#x", result);
117            return NULL;
118        }
119        *needsDetach = true;
120    }
121    return env;
122}
123
124void JNISurfaceTextureContext::detachJNI() {
125    JavaVM* vm = AndroidRuntime::getJavaVM();
126    int result = vm->DetachCurrentThread();
127    if (result != JNI_OK) {
128        ALOGE("thread detach failed: %#x", result);
129    }
130}
131
132JNISurfaceTextureContext::~JNISurfaceTextureContext()
133{
134    bool needsDetach = false;
135    JNIEnv* env = getJNIEnv(&needsDetach);
136    if (env != NULL) {
137        env->DeleteGlobalRef(mWeakThiz);
138        env->DeleteGlobalRef(mClazz);
139    } else {
140        ALOGW("leaking JNI object references");
141    }
142    if (needsDetach) {
143        detachJNI();
144    }
145}
146
147void JNISurfaceTextureContext::onFrameAvailable()
148{
149    bool needsDetach = false;
150    JNIEnv* env = getJNIEnv(&needsDetach);
151    if (env != NULL) {
152        env->CallStaticVoidMethod(mClazz, fields.postEvent, mWeakThiz);
153    } else {
154        ALOGW("onFrameAvailable event will not posted");
155    }
156    if (needsDetach) {
157        detachJNI();
158    }
159}
160
161// ----------------------------------------------------------------------------
162
163static void SurfaceTexture_classInit(JNIEnv* env, jclass clazz)
164{
165    fields.surfaceTexture = env->GetFieldID(clazz,
166            ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I");
167    if (fields.surfaceTexture == NULL) {
168        ALOGE("can't find android/graphics/SurfaceTexture.%s",
169                ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID);
170    }
171
172    fields.postEvent = env->GetStaticMethodID(clazz, "postEventFromNative",
173            "(Ljava/lang/Object;)V");
174    if (fields.postEvent == NULL) {
175        ALOGE("can't find android/graphics/SurfaceTexture.postEventFromNative");
176    }
177}
178
179static void SurfaceTexture_init(JNIEnv* env, jobject thiz, jint texName,
180        jobject weakThiz, jboolean allowSynchronous)
181{
182    sp<SurfaceTexture> surfaceTexture(new SurfaceTexture(texName, allowSynchronous));
183    if (surfaceTexture == 0) {
184        jniThrowException(env, OutOfResourcesException,
185                "Unable to create native SurfaceTexture");
186        return;
187    }
188    SurfaceTexture_setSurfaceTexture(env, thiz, surfaceTexture);
189
190    jclass clazz = env->GetObjectClass(thiz);
191    if (clazz == NULL) {
192        jniThrowRuntimeException(env,
193                "Can't find android/graphics/SurfaceTexture");
194        return;
195    }
196
197    sp<JNISurfaceTextureContext> ctx(new JNISurfaceTextureContext(env, weakThiz,
198            clazz));
199    surfaceTexture->setFrameAvailableListener(ctx);
200}
201
202static void SurfaceTexture_finalize(JNIEnv* env, jobject thiz)
203{
204    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
205    surfaceTexture->setFrameAvailableListener(0);
206    SurfaceTexture_setSurfaceTexture(env, thiz, 0);
207}
208
209static void SurfaceTexture_setDefaultBufferSize(
210        JNIEnv* env, jobject thiz, jint width, jint height)
211{
212    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
213    surfaceTexture->setDefaultBufferSize(width, height);
214}
215
216static void SurfaceTexture_updateTexImage(JNIEnv* env, jobject thiz)
217{
218    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
219    status_t err = surfaceTexture->updateTexImage();
220    if (err == INVALID_OPERATION) {
221        jniThrowException(env, IllegalStateException, "Unable to update texture contents (see "
222                "logcat for details)");
223    } else if (err < 0) {
224        jniThrowRuntimeException(env, "Error during updateTexImage (see logcat for details)");
225    }
226    err = surfaceTexture->doGLFenceWait();
227    if (err != NO_ERROR) {
228        jniThrowRuntimeException(env, "Error waiting for fence (see logcat for details)");
229    }
230}
231
232static jint SurfaceTexture_detachFromGLContext(JNIEnv* env, jobject thiz)
233{
234    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
235    return surfaceTexture->detachFromContext();
236}
237
238static jint SurfaceTexture_attachToGLContext(JNIEnv* env, jobject thiz, jint tex)
239{
240    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
241    return surfaceTexture->attachToContext((GLuint)tex);
242}
243
244static void SurfaceTexture_getTransformMatrix(JNIEnv* env, jobject thiz,
245        jfloatArray jmtx)
246{
247    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
248    float* mtx = env->GetFloatArrayElements(jmtx, NULL);
249    surfaceTexture->getTransformMatrix(mtx);
250    env->ReleaseFloatArrayElements(jmtx, mtx, 0);
251}
252
253static jlong SurfaceTexture_getTimestamp(JNIEnv* env, jobject thiz)
254{
255    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
256    return surfaceTexture->getTimestamp();
257}
258
259static void SurfaceTexture_release(JNIEnv* env, jobject thiz)
260{
261    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
262    surfaceTexture->abandon();
263}
264
265// ----------------------------------------------------------------------------
266
267static JNINativeMethod gSurfaceTextureMethods[] = {
268    {"nativeClassInit",            "()V",   (void*)SurfaceTexture_classInit },
269    {"nativeInit",                 "(ILjava/lang/Object;Z)V", (void*)SurfaceTexture_init },
270    {"nativeFinalize",             "()V",   (void*)SurfaceTexture_finalize },
271    {"nativeSetDefaultBufferSize", "(II)V", (void*)SurfaceTexture_setDefaultBufferSize },
272    {"nativeUpdateTexImage",       "()V",   (void*)SurfaceTexture_updateTexImage },
273    {"nativeDetachFromGLContext",  "()I",   (void*)SurfaceTexture_detachFromGLContext },
274    {"nativeAttachToGLContext",    "(I)I",   (void*)SurfaceTexture_attachToGLContext },
275    {"nativeGetTransformMatrix",   "([F)V", (void*)SurfaceTexture_getTransformMatrix },
276    {"nativeGetTimestamp",         "()J",   (void*)SurfaceTexture_getTimestamp },
277    {"nativeRelease",              "()V",   (void*)SurfaceTexture_release },
278};
279
280int register_android_graphics_SurfaceTexture(JNIEnv* env)
281{
282    int err = 0;
283    err = AndroidRuntime::registerNativeMethods(env, kSurfaceTextureClassPathName,
284            gSurfaceTextureMethods, NELEM(gSurfaceTextureMethods));
285    return err;
286}
287
288} // namespace android
289