Home | History | Annotate | Download | only in jni 
      1 /*
      2  * Copyright (C) 2007 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 "Surface"
     18 
     19 #include <stdio.h>
     20 
     21 #include "jni.h"
     22 #include "JNIHelp.h"
     23 #include "android_os_Parcel.h"
     24 #include "android/graphics/GraphicsJNI.h"
     25 
     26 #include <android_runtime/AndroidRuntime.h>
     27 #include <android_runtime/android_view_Surface.h>
     28 #include <android_runtime/android_graphics_SurfaceTexture.h>
     29 #include <android_runtime/Log.h>
     30 
     31 #include <binder/Parcel.h>
     32 
     33 #include <gui/Surface.h>
     34 #include <gui/SurfaceControl.h>
     35 #include <gui/GLConsumer.h>
     36 
     37 #include <ui/Rect.h>
     38 #include <ui/Region.h>
     39 
     40 #include <SkCanvas.h>
     41 #include <SkBitmap.h>
     42 #include <SkRegion.h>
     43 
     44 #include <utils/misc.h>
     45 #include <utils/Log.h>
     46 
     47 #include <ScopedUtfChars.h>
     48 
     49 // ----------------------------------------------------------------------------
     50 
     51 namespace android {
     52 
     53 static const char* const OutOfResourcesException =
     54     "android/view/Surface$OutOfResourcesException";
     55 
     56 static struct {
     57     jclass clazz;
     58     jfieldID mNativeObject;
     59     jfieldID mLock;
     60     jmethodID ctor;
     61 } gSurfaceClassInfo;
     62 
     63 static struct {
     64     jfieldID left;
     65     jfieldID top;
     66     jfieldID right;
     67     jfieldID bottom;
     68 } gRectClassInfo;
     69 
     70 static struct {
     71     jfieldID mFinalizer;
     72     jfieldID mNativeCanvas;
     73     jfieldID mSurfaceFormat;
     74 } gCanvasClassInfo;
     75 
     76 static struct {
     77     jfieldID mNativeCanvas;
     78 } gCanvasFinalizerClassInfo;
     79 
     80 // ----------------------------------------------------------------------------
     81 
     82 // this is just a pointer we use to pass to inc/decStrong
     83 static const void *sRefBaseOwner;
     84 
     85 bool android_view_Surface_isInstanceOf(JNIEnv* env, jobject obj) {
     86     return env->IsInstanceOf(obj, gSurfaceClassInfo.clazz);
     87 }
     88 
     89 sp<ANativeWindow> android_view_Surface_getNativeWindow(JNIEnv* env, jobject surfaceObj) {
     90     return android_view_Surface_getSurface(env, surfaceObj);
     91 }
     92 
     93 sp<Surface> android_view_Surface_getSurface(JNIEnv* env, jobject surfaceObj) {
     94     sp<Surface> sur;
     95     jobject lock = env->GetObjectField(surfaceObj,
     96             gSurfaceClassInfo.mLock);
     97     if (env->MonitorEnter(lock) == JNI_OK) {
     98         sur = reinterpret_cast<Surface *>(
     99                 env->GetIntField(surfaceObj, gSurfaceClassInfo.mNativeObject));
    100         env->MonitorExit(lock);
    101     }
    102     return sur;
    103 }
    104 
    105 jobject android_view_Surface_createFromIGraphicBufferProducer(JNIEnv* env,
    106         const sp<IGraphicBufferProducer>& bufferProducer) {
    107     if (bufferProducer == NULL) {
    108         return NULL;
    109     }
    110 
    111     sp<Surface> surface(new Surface(bufferProducer, true));
    112     if (surface == NULL) {
    113         return NULL;
    114     }
    115 
    116     jobject surfaceObj = env->NewObject(gSurfaceClassInfo.clazz, gSurfaceClassInfo.ctor, surface.get());
    117     if (surfaceObj == NULL) {
    118         if (env->ExceptionCheck()) {
    119             ALOGE("Could not create instance of Surface from IGraphicBufferProducer.");
    120             LOGE_EX(env);
    121             env->ExceptionClear();
    122         }
    123         return NULL;
    124     }
    125     surface->incStrong(&sRefBaseOwner);
    126     return surfaceObj;
    127 }
    128 
    129 // ----------------------------------------------------------------------------
    130 
    131 static inline bool isSurfaceValid(const sp<Surface>& sur) {
    132     return Surface::isValid(sur);
    133 }
    134 
    135 // ----------------------------------------------------------------------------
    136 
    137 static jint nativeCreateFromSurfaceTexture(JNIEnv* env, jclass clazz,
    138         jobject surfaceTextureObj) {
    139     sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surfaceTextureObj));
    140     if (producer == NULL) {
    141         jniThrowException(env, "java/lang/IllegalArgumentException",
    142                 "SurfaceTexture has already been released");
    143         return 0;
    144     }
    145 
    146     sp<Surface> surface(new Surface(producer, true));
    147     if (surface == NULL) {
    148         jniThrowException(env, OutOfResourcesException, NULL);
    149         return 0;
    150     }
    151 
    152     surface->incStrong(&sRefBaseOwner);
    153     return int(surface.get());
    154 }
    155 
    156 static void nativeRelease(JNIEnv* env, jclass clazz, jint nativeObject) {
    157     sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
    158     sur->decStrong(&sRefBaseOwner);
    159 }
    160 
    161 static jboolean nativeIsValid(JNIEnv* env, jclass clazz, jint nativeObject) {
    162     sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
    163     return isSurfaceValid(sur) ? JNI_TRUE : JNI_FALSE;
    164 }
    165 
    166 static jboolean nativeIsConsumerRunningBehind(JNIEnv* env, jclass clazz, jint nativeObject) {
    167     sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
    168     if (!isSurfaceValid(sur)) {
    169         doThrowIAE(env);
    170         return JNI_FALSE;
    171     }
    172     int value = 0;
    173     ANativeWindow* anw = static_cast<ANativeWindow*>(sur.get());
    174     anw->query(anw, NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND, &value);
    175     return value;
    176 }
    177 
    178 static inline SkBitmap::Config convertPixelFormat(PixelFormat format) {
    179     /* note: if PIXEL_FORMAT_RGBX_8888 means that all alpha bytes are 0xFF, then
    180         we can map to SkBitmap::kARGB_8888_Config, and optionally call
    181         bitmap.setIsOpaque(true) on the resulting SkBitmap (as an accelerator)
    182     */
    183     switch (format) {
    184     case PIXEL_FORMAT_RGBX_8888:    return SkBitmap::kARGB_8888_Config;
    185     case PIXEL_FORMAT_RGBA_8888:    return SkBitmap::kARGB_8888_Config;
    186     case PIXEL_FORMAT_RGB_565:      return SkBitmap::kRGB_565_Config;
    187     default:                        return SkBitmap::kNo_Config;
    188     }
    189 }
    190 
    191 static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
    192   jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
    193   SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
    194           env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
    195   env->SetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas, (int)newCanvas);
    196   env->SetIntField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int)newCanvas);
    197   SkSafeUnref(previousCanvas);
    198 }
    199 
    200 static jint nativeLockCanvas(JNIEnv* env, jclass clazz,
    201         jint nativeObject, jobject canvasObj, jobject dirtyRectObj) {
    202     sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
    203 
    204     if (!isSurfaceValid(surface)) {
    205         doThrowIAE(env);
    206         return 0;
    207     }
    208 
    209     Rect dirtyRect;
    210     Rect* dirtyRectPtr = NULL;
    211 
    212     if (dirtyRectObj) {
    213         dirtyRect.left   = env->GetIntField(dirtyRectObj, gRectClassInfo.left);
    214         dirtyRect.top    = env->GetIntField(dirtyRectObj, gRectClassInfo.top);
    215         dirtyRect.right  = env->GetIntField(dirtyRectObj, gRectClassInfo.right);
    216         dirtyRect.bottom = env->GetIntField(dirtyRectObj, gRectClassInfo.bottom);
    217         dirtyRectPtr = &dirtyRect;
    218     }
    219 
    220     ANativeWindow_Buffer outBuffer;
    221     status_t err = surface->lock(&outBuffer, dirtyRectPtr);
    222     if (err < 0) {
    223         const char* const exception = (err == NO_MEMORY) ?
    224                 OutOfResourcesException :
    225                 "java/lang/IllegalArgumentException";
    226         jniThrowException(env, exception, NULL);
    227         return 0;
    228     }
    229 
    230     // Associate a SkCanvas object to this surface
    231     env->SetIntField(canvasObj, gCanvasClassInfo.mSurfaceFormat, outBuffer.format);
    232 
    233     SkBitmap bitmap;
    234     ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);
    235     bitmap.setConfig(convertPixelFormat(outBuffer.format), outBuffer.width, outBuffer.height, bpr);
    236     if (outBuffer.format == PIXEL_FORMAT_RGBX_8888) {
    237         bitmap.setIsOpaque(true);
    238     }
    239     if (outBuffer.width > 0 && outBuffer.height > 0) {
    240         bitmap.setPixels(outBuffer.bits);
    241     } else {
    242         // be safe with an empty bitmap.
    243         bitmap.setPixels(NULL);
    244     }
    245 
    246     SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
    247     swapCanvasPtr(env, canvasObj, nativeCanvas);
    248 
    249     if (dirtyRectPtr) {
    250         nativeCanvas->clipRect( SkRect::Make(reinterpret_cast<const SkIRect&>(dirtyRect)) );
    251     }
    252 
    253     if (dirtyRectObj) {
    254         env->SetIntField(dirtyRectObj, gRectClassInfo.left,   dirtyRect.left);
    255         env->SetIntField(dirtyRectObj, gRectClassInfo.top,    dirtyRect.top);
    256         env->SetIntField(dirtyRectObj, gRectClassInfo.right,  dirtyRect.right);
    257         env->SetIntField(dirtyRectObj, gRectClassInfo.bottom, dirtyRect.bottom);
    258     }
    259 
    260     // Create another reference to the surface and return it.  This reference
    261     // should be passed to nativeUnlockCanvasAndPost in place of mNativeObject,
    262     // because the latter could be replaced while the surface is locked.
    263     sp<Surface> lockedSurface(surface);
    264     lockedSurface->incStrong(&sRefBaseOwner);
    265     return (int) lockedSurface.get();
    266 }
    267 
    268 static void nativeUnlockCanvasAndPost(JNIEnv* env, jclass clazz,
    269         jint nativeObject, jobject canvasObj) {
    270     sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
    271     if (!isSurfaceValid(surface)) {
    272         return;
    273     }
    274 
    275     // detach the canvas from the surface
    276     SkCanvas* nativeCanvas = SkNEW(SkCanvas);
    277     swapCanvasPtr(env, canvasObj, nativeCanvas);
    278 
    279     // unlock surface
    280     status_t err = surface->unlockAndPost();
    281     if (err < 0) {
    282         doThrowIAE(env);
    283     }
    284 }
    285 
    286 // ----------------------------------------------------------------------------
    287 
    288 static jint nativeCreateFromSurfaceControl(JNIEnv* env, jclass clazz,
    289         jint surfaceControlNativeObj) {
    290     /*
    291      * This is used by the WindowManagerService just after constructing
    292      * a Surface and is necessary for returning the Surface reference to
    293      * the caller. At this point, we should only have a SurfaceControl.
    294      */
    295 
    296     sp<SurfaceControl> ctrl(reinterpret_cast<SurfaceControl *>(surfaceControlNativeObj));
    297     sp<Surface> surface(ctrl->getSurface());
    298     if (surface != NULL) {
    299         surface->incStrong(&sRefBaseOwner);
    300     }
    301     return reinterpret_cast<jint>(surface.get());
    302 }
    303 
    304 static jint nativeReadFromParcel(JNIEnv* env, jclass clazz,
    305         jint nativeObject, jobject parcelObj) {
    306     Parcel* parcel = parcelForJavaObject(env, parcelObj);
    307     if (parcel == NULL) {
    308         doThrowNPE(env);
    309         return 0;
    310     }
    311 
    312     sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
    313     sp<IBinder> binder(parcel->readStrongBinder());
    314 
    315     // update the Surface only if the underlying IGraphicBufferProducer
    316     // has changed.
    317     if (self != NULL
    318             && (self->getIGraphicBufferProducer()->asBinder() == binder)) {
    319         // same IGraphicBufferProducer, return ourselves
    320         return int(self.get());
    321     }
    322 
    323     sp<Surface> sur;
    324     sp<IGraphicBufferProducer> gbp(interface_cast<IGraphicBufferProducer>(binder));
    325     if (gbp != NULL) {
    326         // we have a new IGraphicBufferProducer, create a new Surface for it
    327         sur = new Surface(gbp, true);
    328         // and keep a reference before passing to java
    329         sur->incStrong(&sRefBaseOwner);
    330     }
    331 
    332     if (self != NULL) {
    333         // and loose the java reference to ourselves
    334         self->decStrong(&sRefBaseOwner);
    335     }
    336 
    337     return int(sur.get());
    338 }
    339 
    340 static void nativeWriteToParcel(JNIEnv* env, jclass clazz,
    341         jint nativeObject, jobject parcelObj) {
    342     Parcel* parcel = parcelForJavaObject(env, parcelObj);
    343     if (parcel == NULL) {
    344         doThrowNPE(env);
    345         return;
    346     }
    347     sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
    348     parcel->writeStrongBinder( self != 0 ? self->getIGraphicBufferProducer()->asBinder() : NULL);
    349 }
    350 
    351 // ----------------------------------------------------------------------------
    352 
    353 static JNINativeMethod gSurfaceMethods[] = {
    354     {"nativeCreateFromSurfaceTexture", "(Landroid/graphics/SurfaceTexture;)I",
    355             (void*)nativeCreateFromSurfaceTexture },
    356     {"nativeRelease", "(I)V",
    357             (void*)nativeRelease },
    358     {"nativeIsValid", "(I)Z",
    359             (void*)nativeIsValid },
    360     {"nativeIsConsumerRunningBehind", "(I)Z",
    361             (void*)nativeIsConsumerRunningBehind },
    362     {"nativeLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)I",
    363             (void*)nativeLockCanvas },
    364     {"nativeUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
    365             (void*)nativeUnlockCanvasAndPost },
    366     {"nativeCreateFromSurfaceControl", "(I)I",
    367             (void*)nativeCreateFromSurfaceControl },
    368     {"nativeReadFromParcel", "(ILandroid/os/Parcel;)I",
    369             (void*)nativeReadFromParcel },
    370     {"nativeWriteToParcel", "(ILandroid/os/Parcel;)V",
    371             (void*)nativeWriteToParcel },
    372 };
    373 
    374 int register_android_view_Surface(JNIEnv* env)
    375 {
    376     int err = AndroidRuntime::registerNativeMethods(env, "android/view/Surface",
    377             gSurfaceMethods, NELEM(gSurfaceMethods));
    378 
    379     jclass clazz = env->FindClass("android/view/Surface");
    380     gSurfaceClassInfo.clazz = jclass(env->NewGlobalRef(clazz));
    381     gSurfaceClassInfo.mNativeObject =
    382             env->GetFieldID(gSurfaceClassInfo.clazz, "mNativeObject", "I");
    383     gSurfaceClassInfo.mLock =
    384             env->GetFieldID(gSurfaceClassInfo.clazz, "mLock", "Ljava/lang/Object;");
    385     gSurfaceClassInfo.ctor = env->GetMethodID(gSurfaceClassInfo.clazz, "<init>", "(I)V");
    386 
    387     clazz = env->FindClass("android/graphics/Canvas");
    388     gCanvasClassInfo.mFinalizer = env->GetFieldID(clazz, "mFinalizer", "Landroid/graphics/Canvas$CanvasFinalizer;");
    389     gCanvasClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
    390     gCanvasClassInfo.mSurfaceFormat = env->GetFieldID(clazz, "mSurfaceFormat", "I");
    391 
    392     clazz = env->FindClass("android/graphics/Canvas$CanvasFinalizer");
    393     gCanvasFinalizerClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
    394 
    395     clazz = env->FindClass("android/graphics/Rect");
    396     gRectClassInfo.left = env->GetFieldID(clazz, "left", "I");
    397     gRectClassInfo.top = env->GetFieldID(clazz, "top", "I");
    398     gRectClassInfo.right = env->GetFieldID(clazz, "right", "I");
    399     gRectClassInfo.bottom = env->GetFieldID(clazz, "bottom", "I");
    400 
    401     return err;
    402 }
    403 
    404 };
    405