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      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 
     30 #include <binder/Parcel.h>
     31 
     32 #include <gui/Surface.h>
     33 #include <gui/SurfaceControl.h>
     34 #include <gui/GLConsumer.h>
     35 
     36 #include <ui/Rect.h>
     37 #include <ui/Region.h>
     38 
     39 #include <SkCanvas.h>
     40 #include <SkBitmap.h>
     41 #include <SkRegion.h>
     42 
     43 #include <utils/misc.h>
     44 #include <utils/Log.h>
     45 
     46 #include <ScopedUtfChars.h>
     47 
     48 // ----------------------------------------------------------------------------
     49 
     50 namespace android {
     51 
     52 static const char* const OutOfResourcesException =
     53     "android/view/Surface$OutOfResourcesException";
     54 
     55 static struct {
     56     jclass clazz;
     57     jfieldID mNativeObject;
     58     jfieldID mLock;
     59     jmethodID ctor;
     60 } gSurfaceClassInfo;
     61 
     62 static struct {
     63     jfieldID left;
     64     jfieldID top;
     65     jfieldID right;
     66     jfieldID bottom;
     67 } gRectClassInfo;
     68 
     69 static struct {
     70     jfieldID mFinalizer;
     71     jfieldID mNativeCanvas;
     72     jfieldID mSurfaceFormat;
     73 } gCanvasClassInfo;
     74 
     75 static struct {
     76     jfieldID mNativeCanvas;
     77 } gCanvasFinalizerClassInfo;
     78 
     79 // ----------------------------------------------------------------------------
     80 
     81 // this is just a pointer we use to pass to inc/decStrong
     82 static const void *sRefBaseOwner;
     83 
     84 bool android_view_Surface_isInstanceOf(JNIEnv* env, jobject obj) {
     85     return env->IsInstanceOf(obj, gSurfaceClassInfo.clazz);
     86 }
     87 
     88 sp<ANativeWindow> android_view_Surface_getNativeWindow(JNIEnv* env, jobject surfaceObj) {
     89     return android_view_Surface_getSurface(env, surfaceObj);
     90 }
     91 
     92 sp<Surface> android_view_Surface_getSurface(JNIEnv* env, jobject surfaceObj) {
     93     sp<Surface> sur;
     94     jobject lock = env->GetObjectField(surfaceObj,
     95             gSurfaceClassInfo.mLock);
     96     if (env->MonitorEnter(lock) == JNI_OK) {
     97         sur = reinterpret_cast<Surface *>(
     98                 env->GetIntField(surfaceObj, gSurfaceClassInfo.mNativeObject));
     99         env->MonitorExit(lock);
    100     }
    101     return sur;
    102 }
    103 
    104 jobject android_view_Surface_createFromIGraphicBufferProducer(JNIEnv* env,
    105         const sp<IGraphicBufferProducer>& bufferProducer) {
    106     if (bufferProducer == NULL) {
    107         return NULL;
    108     }
    109 
    110     sp<Surface> surface(new Surface(bufferProducer));
    111     if (surface == NULL) {
    112         return NULL;
    113     }
    114 
    115     jobject surfaceObj = env->NewObject(gSurfaceClassInfo.clazz, gSurfaceClassInfo.ctor, surface.get());
    116     if (surfaceObj == NULL) {
    117         if (env->ExceptionCheck()) {
    118             ALOGE("Could not create instance of Surface from IGraphicBufferProducer.");
    119             LOGE_EX(env);
    120             env->ExceptionClear();
    121         }
    122         return NULL;
    123     }
    124     surface->incStrong(&sRefBaseOwner);
    125     return surfaceObj;
    126 }
    127 
    128 // ----------------------------------------------------------------------------
    129 
    130 static inline bool isSurfaceValid(const sp<Surface>& sur) {
    131     return Surface::isValid(sur);
    132 }
    133 
    134 // ----------------------------------------------------------------------------
    135 
    136 static jint nativeCreateFromSurfaceTexture(JNIEnv* env, jclass clazz,
    137         jobject surfaceTextureObj) {
    138     sp<GLConsumer> st(SurfaceTexture_getSurfaceTexture(env, surfaceTextureObj));
    139     if (st == NULL) {
    140         jniThrowException(env, "java/lang/IllegalArgumentException",
    141                 "SurfaceTexture has already been released");
    142         return 0;
    143     }
    144 
    145     sp<IGraphicBufferProducer> bq = st->getBufferQueue();
    146     sp<Surface> surface(new Surface(bq));
    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_RGBA_4444:    return SkBitmap::kARGB_4444_Config;
    187     case PIXEL_FORMAT_RGB_565:      return SkBitmap::kRGB_565_Config;
    188     case PIXEL_FORMAT_A_8:          return SkBitmap::kA8_Config;
    189     default:                        return SkBitmap::kNo_Config;
    190     }
    191 }
    192 
    193 static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
    194   jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
    195   SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
    196           env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
    197   env->SetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas, (int)newCanvas);
    198   env->SetIntField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int)newCanvas);
    199   SkSafeUnref(previousCanvas);
    200 }
    201 
    202 static void nativeLockCanvas(JNIEnv* env, jclass clazz,
    203         jint nativeObject, jobject canvasObj, jobject dirtyRectObj) {
    204     sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
    205 
    206     if (!isSurfaceValid(surface)) {
    207         doThrowIAE(env);
    208         return;
    209     }
    210 
    211     // get dirty region
    212     Region dirtyRegion;
    213     if (dirtyRectObj) {
    214         Rect dirty;
    215         dirty.left = env->GetIntField(dirtyRectObj, gRectClassInfo.left);
    216         dirty.top = env->GetIntField(dirtyRectObj, gRectClassInfo.top);
    217         dirty.right = env->GetIntField(dirtyRectObj, gRectClassInfo.right);
    218         dirty.bottom = env->GetIntField(dirtyRectObj, gRectClassInfo.bottom);
    219         if (!dirty.isEmpty()) {
    220             dirtyRegion.set(dirty);
    221         }
    222     } else {
    223         dirtyRegion.set(Rect(0x3FFF, 0x3FFF));
    224     }
    225 
    226     ANativeWindow_Buffer outBuffer;
    227     Rect dirtyBounds(dirtyRegion.getBounds());
    228     status_t err = surface->lock(&outBuffer, &dirtyBounds);
    229     dirtyRegion.set(dirtyBounds);
    230     if (err < 0) {
    231         const char* const exception = (err == NO_MEMORY) ?
    232                 OutOfResourcesException :
    233                 "java/lang/IllegalArgumentException";
    234         jniThrowException(env, exception, NULL);
    235         return;
    236     }
    237 
    238     // Associate a SkCanvas object to this surface
    239     env->SetIntField(canvasObj, gCanvasClassInfo.mSurfaceFormat, outBuffer.format);
    240 
    241     SkBitmap bitmap;
    242     ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);
    243     bitmap.setConfig(convertPixelFormat(outBuffer.format), outBuffer.width, outBuffer.height, bpr);
    244     if (outBuffer.format == PIXEL_FORMAT_RGBX_8888) {
    245         bitmap.setIsOpaque(true);
    246     }
    247     if (outBuffer.width > 0 && outBuffer.height > 0) {
    248         bitmap.setPixels(outBuffer.bits);
    249     } else {
    250         // be safe with an empty bitmap.
    251         bitmap.setPixels(NULL);
    252     }
    253 
    254     SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
    255     swapCanvasPtr(env, canvasObj, nativeCanvas);
    256 
    257     SkRegion clipReg;
    258     if (dirtyRegion.isRect()) { // very common case
    259         const Rect b(dirtyRegion.getBounds());
    260         clipReg.setRect(b.left, b.top, b.right, b.bottom);
    261     } else {
    262         size_t count;
    263         Rect const* r = dirtyRegion.getArray(&count);
    264         while (count) {
    265             clipReg.op(r->left, r->top, r->right, r->bottom, SkRegion::kUnion_Op);
    266             r++, count--;
    267         }
    268     }
    269 
    270     nativeCanvas->clipRegion(clipReg);
    271 
    272     if (dirtyRectObj) {
    273         const Rect& bounds(dirtyRegion.getBounds());
    274         env->SetIntField(dirtyRectObj, gRectClassInfo.left, bounds.left);
    275         env->SetIntField(dirtyRectObj, gRectClassInfo.top, bounds.top);
    276         env->SetIntField(dirtyRectObj, gRectClassInfo.right, bounds.right);
    277         env->SetIntField(dirtyRectObj, gRectClassInfo.bottom, bounds.bottom);
    278     }
    279 }
    280 
    281 static void nativeUnlockCanvasAndPost(JNIEnv* env, jclass clazz,
    282         jint nativeObject, jobject canvasObj) {
    283     sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
    284     if (!isSurfaceValid(surface)) {
    285         return;
    286     }
    287 
    288     // detach the canvas from the surface
    289     SkCanvas* nativeCanvas = SkNEW(SkCanvas);
    290     swapCanvasPtr(env, canvasObj, nativeCanvas);
    291 
    292     // unlock surface
    293     status_t err = surface->unlockAndPost();
    294     if (err < 0) {
    295         doThrowIAE(env);
    296     }
    297 }
    298 
    299 // ----------------------------------------------------------------------------
    300 
    301 static jint nativeCreateFromSurfaceControl(JNIEnv* env, jclass clazz,
    302         jint surfaceControlNativeObj) {
    303     /*
    304      * This is used by the WindowManagerService just after constructing
    305      * a Surface and is necessary for returning the Surface reference to
    306      * the caller. At this point, we should only have a SurfaceControl.
    307      */
    308 
    309     sp<SurfaceControl> ctrl(reinterpret_cast<SurfaceControl *>(surfaceControlNativeObj));
    310     sp<Surface> surface(ctrl->getSurface());
    311     if (surface != NULL) {
    312         surface->incStrong(&sRefBaseOwner);
    313     }
    314     return reinterpret_cast<jint>(surface.get());
    315 }
    316 
    317 static jint nativeReadFromParcel(JNIEnv* env, jclass clazz,
    318         jint nativeObject, jobject parcelObj) {
    319     Parcel* parcel = parcelForJavaObject(env, parcelObj);
    320     if (parcel == NULL) {
    321         doThrowNPE(env);
    322         return 0;
    323     }
    324 
    325     sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
    326     sp<IBinder> binder(parcel->readStrongBinder());
    327 
    328     // update the Surface only if the underlying IGraphicBufferProducer
    329     // has changed.
    330     if (self != NULL
    331             && (self->getIGraphicBufferProducer()->asBinder() == binder)) {
    332         // same IGraphicBufferProducer, return ourselves
    333         return int(self.get());
    334     }
    335 
    336     sp<Surface> sur;
    337     sp<IGraphicBufferProducer> gbp(interface_cast<IGraphicBufferProducer>(binder));
    338     if (gbp != NULL) {
    339         // we have a new IGraphicBufferProducer, create a new Surface for it
    340         sur = new Surface(gbp);
    341         // and keep a reference before passing to java
    342         sur->incStrong(&sRefBaseOwner);
    343     }
    344 
    345     if (self != NULL) {
    346         // and loose the java reference to ourselves
    347         self->decStrong(&sRefBaseOwner);
    348     }
    349 
    350     return int(sur.get());
    351 }
    352 
    353 static void nativeWriteToParcel(JNIEnv* env, jclass clazz,
    354         jint nativeObject, jobject parcelObj) {
    355     Parcel* parcel = parcelForJavaObject(env, parcelObj);
    356     if (parcel == NULL) {
    357         doThrowNPE(env);
    358         return;
    359     }
    360     sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
    361     parcel->writeStrongBinder( self != 0 ? self->getIGraphicBufferProducer()->asBinder() : NULL);
    362 }
    363 
    364 // ----------------------------------------------------------------------------
    365 
    366 static JNINativeMethod gSurfaceMethods[] = {
    367     {"nativeCreateFromSurfaceTexture", "(Landroid/graphics/SurfaceTexture;)I",
    368             (void*)nativeCreateFromSurfaceTexture },
    369     {"nativeRelease", "(I)V",
    370             (void*)nativeRelease },
    371     {"nativeIsValid", "(I)Z",
    372             (void*)nativeIsValid },
    373     {"nativeIsConsumerRunningBehind", "(I)Z",
    374             (void*)nativeIsConsumerRunningBehind },
    375     {"nativeLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)V",
    376             (void*)nativeLockCanvas },
    377     {"nativeUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
    378             (void*)nativeUnlockCanvasAndPost },
    379     {"nativeCreateFromSurfaceControl", "(I)I",
    380             (void*)nativeCreateFromSurfaceControl },
    381     {"nativeReadFromParcel", "(ILandroid/os/Parcel;)I",
    382             (void*)nativeReadFromParcel },
    383     {"nativeWriteToParcel", "(ILandroid/os/Parcel;)V",
    384             (void*)nativeWriteToParcel },
    385 };
    386 
    387 int register_android_view_Surface(JNIEnv* env)
    388 {
    389     int err = AndroidRuntime::registerNativeMethods(env, "android/view/Surface",
    390             gSurfaceMethods, NELEM(gSurfaceMethods));
    391 
    392     jclass clazz = env->FindClass("android/view/Surface");
    393     gSurfaceClassInfo.clazz = jclass(env->NewGlobalRef(clazz));
    394     gSurfaceClassInfo.mNativeObject =
    395             env->GetFieldID(gSurfaceClassInfo.clazz, "mNativeSurface", "I");
    396     gSurfaceClassInfo.mLock =
    397             env->GetFieldID(gSurfaceClassInfo.clazz, "mLock", "Ljava/lang/Object;");
    398     gSurfaceClassInfo.ctor = env->GetMethodID(gSurfaceClassInfo.clazz, "<init>", "(I)V");
    399 
    400     clazz = env->FindClass("android/graphics/Canvas");
    401     gCanvasClassInfo.mFinalizer = env->GetFieldID(clazz, "mFinalizer", "Landroid/graphics/Canvas$CanvasFinalizer;");
    402     gCanvasClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
    403     gCanvasClassInfo.mSurfaceFormat = env->GetFieldID(clazz, "mSurfaceFormat", "I");
    404 
    405     clazz = env->FindClass("android/graphics/Canvas$CanvasFinalizer");
    406     gCanvasFinalizerClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
    407 
    408     clazz = env->FindClass("android/graphics/Rect");
    409     gRectClassInfo.left = env->GetFieldID(clazz, "left", "I");
    410     gRectClassInfo.top = env->GetFieldID(clazz, "top", "I");
    411     gRectClassInfo.right = env->GetFieldID(clazz, "right", "I");
    412     gRectClassInfo.bottom = env->GetFieldID(clazz, "bottom", "I");
    413 
    414     return err;
    415 }
    416 
    417 };
    418