android_view_Surface.cpp revision b1d90c8f60f71422196c337f1d078b68867f5710 
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 <gui/Surface.h>
31#include <gui/SurfaceControl.h>
32#include <gui/GLConsumer.h>
33
34#include <ui/Rect.h>
35#include <ui/Region.h>
36
37#include <SkCanvas.h>
38#include <SkBitmap.h>
39#include <SkRegion.h>
40
41#include <utils/misc.h>
42#include <utils/Log.h>
43
44#include <ScopedUtfChars.h>
45
46// ----------------------------------------------------------------------------
47
48namespace android {
49
50static const char* const OutOfResourcesException =
51    "android/view/Surface$OutOfResourcesException";
52
53static struct {
54    jclass clazz;
55    jfieldID mNativeObject;
56    jfieldID mCanvas;
57    jmethodID ctor;
58} gSurfaceClassInfo;
59
60static struct {
61    jfieldID left;
62    jfieldID top;
63    jfieldID right;
64    jfieldID bottom;
65} gRectClassInfo;
66
67static struct {
68    jfieldID mFinalizer;
69    jfieldID mNativeCanvas;
70    jfieldID mSurfaceFormat;
71} gCanvasClassInfo;
72
73static struct {
74    jfieldID mNativeCanvas;
75} gCanvasFinalizerClassInfo;
76
77// ----------------------------------------------------------------------------
78
79// this is just a pointer we use to pass to inc/decStrong
80static const void *sRefBaseOwner;
81
82bool android_view_Surface_isInstanceOf(JNIEnv* env, jobject obj) {
83    return env->IsInstanceOf(obj, gSurfaceClassInfo.clazz);
84}
85
86sp<ANativeWindow> android_view_Surface_getNativeWindow(JNIEnv* env, jobject surfaceObj) {
87    return android_view_Surface_getSurface(env, surfaceObj);
88}
89
90sp<Surface> android_view_Surface_getSurface(JNIEnv* env, jobject surfaceObj) {
91    return reinterpret_cast<Surface *>(
92            env->GetIntField(surfaceObj, gSurfaceClassInfo.mNativeObject));
93}
94
95jobject android_view_Surface_createFromIGraphicBufferProducer(JNIEnv* env,
96        const sp<IGraphicBufferProducer>& bufferProducer) {
97    if (bufferProducer == NULL) {
98        return NULL;
99    }
100
101    sp<Surface> surface(new Surface(bufferProducer));
102    if (surface == NULL) {
103        return NULL;
104    }
105
106    jobject surfaceObj = env->NewObject(gSurfaceClassInfo.clazz, gSurfaceClassInfo.ctor, surface.get());
107    if (surfaceObj == NULL) {
108        if (env->ExceptionCheck()) {
109            ALOGE("Could not create instance of Surface from IGraphicBufferProducer.");
110            LOGE_EX(env);
111            env->ExceptionClear();
112        }
113        return NULL;
114    }
115    surface->incStrong(&sRefBaseOwner);
116    return surfaceObj;
117}
118
119// ----------------------------------------------------------------------------
120
121static inline bool isSurfaceValid(const sp<Surface>& sur) {
122    return Surface::isValid(sur);
123}
124
125// ----------------------------------------------------------------------------
126
127static jint nativeCreateFromSurfaceTexture(JNIEnv* env, jclass clazz,
128        jobject surfaceTextureObj) {
129    sp<GLConsumer> st(SurfaceTexture_getSurfaceTexture(env, surfaceTextureObj));
130    if (st == NULL) {
131        jniThrowException(env, "java/lang/IllegalArgumentException",
132                "SurfaceTexture has already been released");
133        return 0;
134    }
135
136    sp<IGraphicBufferProducer> bq = st->getBufferQueue();
137    sp<Surface> surface(new Surface(bq));
138    if (surface == NULL) {
139        jniThrowException(env, OutOfResourcesException, NULL);
140        return 0;
141    }
142
143    surface->incStrong(&sRefBaseOwner);
144    return int(surface.get());
145}
146
147static void nativeRelease(JNIEnv* env, jclass clazz, jint nativeObject) {
148    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
149    sur->decStrong(&sRefBaseOwner);
150}
151
152static void nativeDestroy(JNIEnv* env, jclass clazz, jint nativeObject) {
153    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
154    sur->decStrong(&sRefBaseOwner);
155}
156
157static jboolean nativeIsValid(JNIEnv* env, jclass clazz, jint nativeObject) {
158    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
159    return isSurfaceValid(sur) ? JNI_TRUE : JNI_FALSE;
160}
161
162static jboolean nativeIsConsumerRunningBehind(JNIEnv* env, jclass clazz, jint nativeObject) {
163    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
164    if (!isSurfaceValid(sur)) {
165        doThrowIAE(env);
166        return JNI_FALSE;
167    }
168    int value = 0;
169    ANativeWindow* anw = static_cast<ANativeWindow*>(sur.get());
170    anw->query(anw, NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND, &value);
171    return value;
172}
173
174static inline SkBitmap::Config convertPixelFormat(PixelFormat format) {
175    /* note: if PIXEL_FORMAT_RGBX_8888 means that all alpha bytes are 0xFF, then
176        we can map to SkBitmap::kARGB_8888_Config, and optionally call
177        bitmap.setIsOpaque(true) on the resulting SkBitmap (as an accelerator)
178    */
179    switch (format) {
180    case PIXEL_FORMAT_RGBX_8888:    return SkBitmap::kARGB_8888_Config;
181    case PIXEL_FORMAT_RGBA_8888:    return SkBitmap::kARGB_8888_Config;
182    case PIXEL_FORMAT_RGBA_4444:    return SkBitmap::kARGB_4444_Config;
183    case PIXEL_FORMAT_RGB_565:      return SkBitmap::kRGB_565_Config;
184    case PIXEL_FORMAT_A_8:          return SkBitmap::kA8_Config;
185    default:                        return SkBitmap::kNo_Config;
186    }
187}
188
189static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
190  jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
191  SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
192          env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
193  env->SetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas, (int)newCanvas);
194  env->SetIntField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int)newCanvas);
195  SkSafeUnref(previousCanvas);
196}
197
198static jobject nativeLockCanvas(JNIEnv* env, jobject surfaceObj, jint nativeObject, jobject dirtyRectObj) {
199    sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
200
201    if (!isSurfaceValid(surface)) {
202        doThrowIAE(env);
203        return NULL;
204    }
205
206    // get dirty region
207    Region dirtyRegion;
208    if (dirtyRectObj) {
209        Rect dirty;
210        dirty.left = env->GetIntField(dirtyRectObj, gRectClassInfo.left);
211        dirty.top = env->GetIntField(dirtyRectObj, gRectClassInfo.top);
212        dirty.right = env->GetIntField(dirtyRectObj, gRectClassInfo.right);
213        dirty.bottom = env->GetIntField(dirtyRectObj, gRectClassInfo.bottom);
214        if (!dirty.isEmpty()) {
215            dirtyRegion.set(dirty);
216        }
217    } else {
218        dirtyRegion.set(Rect(0x3FFF, 0x3FFF));
219    }
220
221    ANativeWindow_Buffer outBuffer;
222    Rect dirtyBounds(dirtyRegion.getBounds());
223    status_t err = surface->lock(&outBuffer, &dirtyBounds);
224    dirtyRegion.set(dirtyBounds);
225    if (err < 0) {
226        const char* const exception = (err == NO_MEMORY) ?
227                OutOfResourcesException :
228                "java/lang/IllegalArgumentException";
229        jniThrowException(env, exception, NULL);
230        return NULL;
231    }
232
233    // Associate a SkCanvas object to this surface
234    jobject canvasObj = env->GetObjectField(surfaceObj, gSurfaceClassInfo.mCanvas);
235    env->SetIntField(canvasObj, gCanvasClassInfo.mSurfaceFormat, outBuffer.format);
236
237    SkBitmap bitmap;
238    ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);
239    bitmap.setConfig(convertPixelFormat(outBuffer.format), outBuffer.width, outBuffer.height, bpr);
240    if (outBuffer.format == PIXEL_FORMAT_RGBX_8888) {
241        bitmap.setIsOpaque(true);
242    }
243    if (outBuffer.width > 0 && outBuffer.height > 0) {
244        bitmap.setPixels(outBuffer.bits);
245    } else {
246        // be safe with an empty bitmap.
247        bitmap.setPixels(NULL);
248    }
249
250    SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
251    swapCanvasPtr(env, canvasObj, nativeCanvas);
252
253    SkRegion clipReg;
254    if (dirtyRegion.isRect()) { // very common case
255        const Rect b(dirtyRegion.getBounds());
256        clipReg.setRect(b.left, b.top, b.right, b.bottom);
257    } else {
258        size_t count;
259        Rect const* r = dirtyRegion.getArray(&count);
260        while (count) {
261            clipReg.op(r->left, r->top, r->right, r->bottom, SkRegion::kUnion_Op);
262            r++, count--;
263        }
264    }
265
266    nativeCanvas->clipRegion(clipReg);
267
268    if (dirtyRectObj) {
269        const Rect& bounds(dirtyRegion.getBounds());
270        env->SetIntField(dirtyRectObj, gRectClassInfo.left, bounds.left);
271        env->SetIntField(dirtyRectObj, gRectClassInfo.top, bounds.top);
272        env->SetIntField(dirtyRectObj, gRectClassInfo.right, bounds.right);
273        env->SetIntField(dirtyRectObj, gRectClassInfo.bottom, bounds.bottom);
274    }
275
276    return canvasObj;
277}
278
279static void nativeUnlockCanvasAndPost(JNIEnv* env, jobject surfaceObj, jint nativeObject, jobject canvasObj) {
280    jobject ownCanvasObj = env->GetObjectField(surfaceObj, gSurfaceClassInfo.mCanvas);
281    if (!env->IsSameObject(ownCanvasObj, canvasObj)) {
282        doThrowIAE(env);
283        return;
284    }
285
286    sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
287    if (!isSurfaceValid(surface)) {
288        return;
289    }
290
291    // detach the canvas from the surface
292    SkCanvas* nativeCanvas = SkNEW(SkCanvas);
293    swapCanvasPtr(env, canvasObj, nativeCanvas);
294
295    // unlock surface
296    status_t err = surface->unlockAndPost();
297    if (err < 0) {
298        doThrowIAE(env);
299    }
300}
301
302// ----------------------------------------------------------------------------
303
304static jint nativeCopyFrom(JNIEnv* env, jclass clazz,
305        jint nativeObject, jint surfaceControlNativeObj) {
306    /*
307     * This is used by the WindowManagerService just after constructing
308     * a Surface and is necessary for returning the Surface reference to
309     * the caller. At this point, we should only have a SurfaceControl.
310     */
311
312    sp<SurfaceControl> ctrl(reinterpret_cast<SurfaceControl *>(surfaceControlNativeObj));
313    sp<Surface> other(ctrl->getSurface());
314    if (other != NULL) {
315        other->incStrong(&sRefBaseOwner);
316    }
317
318    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
319    if (sur != NULL) {
320        sur->decStrong(&sRefBaseOwner);
321    }
322
323    return int(other.get());
324}
325
326static jint nativeReadFromParcel(JNIEnv* env, jclass clazz,
327        jint nativeObject, jobject parcelObj) {
328    Parcel* parcel = parcelForJavaObject(env, parcelObj);
329    if (parcel == NULL) {
330        doThrowNPE(env);
331        return 0;
332    }
333    sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
334    if (self != NULL) {
335        self->decStrong(&sRefBaseOwner);
336    }
337    sp<Surface> sur(Surface::readFromParcel(*parcel));
338    if (sur != NULL) {
339        sur->incStrong(&sRefBaseOwner);
340    }
341    return int(sur.get());
342}
343
344static void nativeWriteToParcel(JNIEnv* env, jclass clazz,
345        jint nativeObject, jobject parcelObj) {
346    Parcel* parcel = parcelForJavaObject(env, parcelObj);
347    if (parcel == NULL) {
348        doThrowNPE(env);
349        return;
350    }
351    sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
352    Surface::writeToParcel(self, parcel);
353}
354
355// ----------------------------------------------------------------------------
356
357static JNINativeMethod gSurfaceMethods[] = {
358    {"nativeCreateFromSurfaceTexture", "(Landroid/graphics/SurfaceTexture;)I",
359            (void*)nativeCreateFromSurfaceTexture },
360    {"nativeRelease", "(I)V",
361            (void*)nativeRelease },
362    {"nativeDestroy", "(I)V",
363            (void*)nativeDestroy },
364    {"nativeIsValid", "(I)Z",
365            (void*)nativeIsValid },
366    {"nativeIsConsumerRunningBehind", "(I)Z",
367            (void*)nativeIsConsumerRunningBehind },
368    {"nativeLockCanvas", "(ILandroid/graphics/Rect;)Landroid/graphics/Canvas;",
369            (void*)nativeLockCanvas },
370    {"nativeUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
371            (void*)nativeUnlockCanvasAndPost },
372    {"nativeCopyFrom", "(II)I",
373            (void*)nativeCopyFrom },
374    {"nativeReadFromParcel", "(ILandroid/os/Parcel;)I",
375            (void*)nativeReadFromParcel },
376    {"nativeWriteToParcel", "(ILandroid/os/Parcel;)V",
377            (void*)nativeWriteToParcel },
378};
379
380int register_android_view_Surface(JNIEnv* env)
381{
382    int err = AndroidRuntime::registerNativeMethods(env, "android/view/Surface",
383            gSurfaceMethods, NELEM(gSurfaceMethods));
384
385    jclass clazz = env->FindClass("android/view/Surface");
386    gSurfaceClassInfo.clazz = jclass(env->NewGlobalRef(clazz));
387    gSurfaceClassInfo.mNativeObject =
388            env->GetFieldID(gSurfaceClassInfo.clazz, "mNativeObject", "I");
389    gSurfaceClassInfo.mCanvas =
390            env->GetFieldID(gSurfaceClassInfo.clazz, "mCanvas", "Landroid/graphics/Canvas;");
391    gSurfaceClassInfo.ctor = env->GetMethodID(gSurfaceClassInfo.clazz, "<init>", "(I)V");
392
393    clazz = env->FindClass("android/graphics/Canvas");
394    gCanvasClassInfo.mFinalizer = env->GetFieldID(clazz, "mFinalizer", "Landroid/graphics/Canvas$CanvasFinalizer;");
395    gCanvasClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
396    gCanvasClassInfo.mSurfaceFormat = env->GetFieldID(clazz, "mSurfaceFormat", "I");
397
398    clazz = env->FindClass("android/graphics/Canvas$CanvasFinalizer");
399    gCanvasFinalizerClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
400
401    clazz = env->FindClass("android/graphics/Rect");
402    gRectClassInfo.left = env->GetFieldID(clazz, "left", "I");
403    gRectClassInfo.top = env->GetFieldID(clazz, "top", "I");
404    gRectClassInfo.right = env->GetFieldID(clazz, "right", "I");
405    gRectClassInfo.bottom = env->GetFieldID(clazz, "bottom", "I");
406
407    return err;
408}
409
410};
411