android_view_Surface.cpp revision 3866f0d581ceaa165710feeee9f37fe1b0d7067d 
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/GLConsumer.h>
32
33#include <ui/Rect.h>
34#include <ui/Region.h>
35
36#include <SkCanvas.h>
37#include <SkBitmap.h>
38#include <SkRegion.h>
39
40#include <utils/misc.h>
41#include <utils/Log.h>
42
43#include <ScopedUtfChars.h>
44
45// ----------------------------------------------------------------------------
46
47namespace android {
48
49static const char* const OutOfResourcesException =
50    "android/view/Surface$OutOfResourcesException";
51
52static struct {
53    jclass clazz;
54    jfieldID mNativeObject;
55    jfieldID mGenerationId;
56    jfieldID mCanvas;
57    jfieldID mCanvasSaveCount;
58    jmethodID ctor;
59} gSurfaceClassInfo;
60
61static struct {
62    jfieldID left;
63    jfieldID top;
64    jfieldID right;
65    jfieldID bottom;
66} gRectClassInfo;
67
68static struct {
69    jfieldID mNativeCanvas;
70    jfieldID mSurfaceFormat;
71} gCanvasClassInfo;
72
73// ----------------------------------------------------------------------------
74
75bool android_view_Surface_isInstanceOf(JNIEnv* env, jobject obj) {
76    return env->IsInstanceOf(obj, gSurfaceClassInfo.clazz);
77}
78
79sp<ANativeWindow> android_view_Surface_getNativeWindow(JNIEnv* env, jobject surfaceObj) {
80    return android_view_Surface_getSurface(env, surfaceObj);
81}
82
83sp<Surface> android_view_Surface_getSurface(JNIEnv* env, jobject surfaceObj) {
84    return reinterpret_cast<Surface *>(
85            env->GetIntField(surfaceObj, gSurfaceClassInfo.mNativeObject));
86}
87
88jobject android_view_Surface_createFromISurfaceTexture(JNIEnv* env,
89        const sp<IGraphicBufferProducer>& bufferProducer) {
90    if (bufferProducer == NULL) {
91        return NULL;
92    }
93
94    sp<Surface> surface(new Surface(bufferProducer));
95    if (surface == NULL) {
96        return NULL;
97    }
98
99    jobject surfaceObj = env->NewObject(gSurfaceClassInfo.clazz, gSurfaceClassInfo.ctor, surface.get());
100    if (surfaceObj == NULL) {
101        if (env->ExceptionCheck()) {
102            ALOGE("Could not create instance of Surface from IGraphicBufferProducer.");
103            LOGE_EX(env);
104            env->ExceptionClear();
105        }
106        return NULL;
107    }
108    surface->incStrong(surfaceObj);
109    return surfaceObj;
110}
111
112// ----------------------------------------------------------------------------
113
114static jint nativeCreateFromSurfaceTexture(JNIEnv* env, jobject surfaceObj,
115        jobject surfaceTextureObj) {
116    sp<GLConsumer> st(SurfaceTexture_getSurfaceTexture(env, surfaceTextureObj));
117    if (st == NULL) {
118        jniThrowException(env, "java/lang/IllegalArgumentException",
119                "SurfaceTexture has already been released");
120        return 0;
121    }
122
123    sp<IGraphicBufferProducer> bq = st->getBufferQueue();
124    sp<Surface> surface(new Surface(bq));
125    if (surface == NULL) {
126        jniThrowException(env, OutOfResourcesException, NULL);
127        return 0;
128    }
129
130    surface->incStrong(surfaceObj);
131    return int(surface.get());
132}
133
134static void nativeRelease(JNIEnv* env, jobject surfaceObj, jint nativeObject) {
135    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
136    sur->decStrong(surfaceObj);
137}
138
139static void nativeDestroy(JNIEnv* env, jobject surfaceObj, jint nativeObject) {
140    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
141    sur->decStrong(surfaceObj);
142}
143
144static jboolean nativeIsValid(JNIEnv* env, jobject surfaceObj, jint nativeObject) {
145    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
146    return Surface::isValid(sur) ? JNI_TRUE : JNI_FALSE;
147}
148
149static jboolean nativeIsConsumerRunningBehind(JNIEnv* env, jobject surfaceObj, jint nativeObject) {
150    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
151    if (!Surface::isValid(sur)) {
152        doThrowIAE(env);
153        return JNI_FALSE;
154    }
155    int value = 0;
156    ANativeWindow* anw = static_cast<ANativeWindow*>(sur.get());
157    anw->query(anw, NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND, &value);
158    return value;
159}
160
161static inline SkBitmap::Config convertPixelFormat(PixelFormat format) {
162    /* note: if PIXEL_FORMAT_RGBX_8888 means that all alpha bytes are 0xFF, then
163        we can map to SkBitmap::kARGB_8888_Config, and optionally call
164        bitmap.setIsOpaque(true) on the resulting SkBitmap (as an accelerator)
165    */
166    switch (format) {
167    case PIXEL_FORMAT_RGBX_8888:    return SkBitmap::kARGB_8888_Config;
168    case PIXEL_FORMAT_RGBA_8888:    return SkBitmap::kARGB_8888_Config;
169    case PIXEL_FORMAT_RGBA_4444:    return SkBitmap::kARGB_4444_Config;
170    case PIXEL_FORMAT_RGB_565:      return SkBitmap::kRGB_565_Config;
171    case PIXEL_FORMAT_A_8:          return SkBitmap::kA8_Config;
172    default:                        return SkBitmap::kNo_Config;
173    }
174}
175
176static jobject nativeLockCanvas(JNIEnv* env, jobject surfaceObj, jint nativeObject, jobject dirtyRectObj) {
177    sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
178
179    if (!Surface::isValid(surface)) {
180        doThrowIAE(env);
181        return NULL;
182    }
183
184    // get dirty region
185    Region dirtyRegion;
186    if (dirtyRectObj) {
187        Rect dirty;
188        dirty.left = env->GetIntField(dirtyRectObj, gRectClassInfo.left);
189        dirty.top = env->GetIntField(dirtyRectObj, gRectClassInfo.top);
190        dirty.right = env->GetIntField(dirtyRectObj, gRectClassInfo.right);
191        dirty.bottom = env->GetIntField(dirtyRectObj, gRectClassInfo.bottom);
192        if (!dirty.isEmpty()) {
193            dirtyRegion.set(dirty);
194        }
195    } else {
196        dirtyRegion.set(Rect(0x3FFF, 0x3FFF));
197    }
198
199    Surface::SurfaceInfo info;
200    status_t err = surface->lock(&info, &dirtyRegion);
201    if (err < 0) {
202        const char* const exception = (err == NO_MEMORY) ?
203                OutOfResourcesException :
204                "java/lang/IllegalArgumentException";
205        jniThrowException(env, exception, NULL);
206        return NULL;
207    }
208
209    // Associate a SkCanvas object to this surface
210    jobject canvasObj = env->GetObjectField(surfaceObj, gSurfaceClassInfo.mCanvas);
211    env->SetIntField(canvasObj, gCanvasClassInfo.mSurfaceFormat, info.format);
212
213    SkCanvas* nativeCanvas = reinterpret_cast<SkCanvas*>(
214            env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
215    SkBitmap bitmap;
216    ssize_t bpr = info.s * bytesPerPixel(info.format);
217    bitmap.setConfig(convertPixelFormat(info.format), info.w, info.h, bpr);
218    if (info.format == PIXEL_FORMAT_RGBX_8888) {
219        bitmap.setIsOpaque(true);
220    }
221    if (info.w > 0 && info.h > 0) {
222        bitmap.setPixels(info.bits);
223    } else {
224        // be safe with an empty bitmap.
225        bitmap.setPixels(NULL);
226    }
227    nativeCanvas->setBitmapDevice(bitmap);
228
229    SkRegion clipReg;
230    if (dirtyRegion.isRect()) { // very common case
231        const Rect b(dirtyRegion.getBounds());
232        clipReg.setRect(b.left, b.top, b.right, b.bottom);
233    } else {
234        size_t count;
235        Rect const* r = dirtyRegion.getArray(&count);
236        while (count) {
237            clipReg.op(r->left, r->top, r->right, r->bottom, SkRegion::kUnion_Op);
238            r++, count--;
239        }
240    }
241
242    nativeCanvas->clipRegion(clipReg);
243
244    int saveCount = nativeCanvas->save();
245    env->SetIntField(surfaceObj, gSurfaceClassInfo.mCanvasSaveCount, saveCount);
246
247    if (dirtyRectObj) {
248        const Rect& bounds(dirtyRegion.getBounds());
249        env->SetIntField(dirtyRectObj, gRectClassInfo.left, bounds.left);
250        env->SetIntField(dirtyRectObj, gRectClassInfo.top, bounds.top);
251        env->SetIntField(dirtyRectObj, gRectClassInfo.right, bounds.right);
252        env->SetIntField(dirtyRectObj, gRectClassInfo.bottom, bounds.bottom);
253    }
254
255    return canvasObj;
256}
257
258static void nativeUnlockCanvasAndPost(JNIEnv* env, jobject surfaceObj, jint nativeObject, jobject canvasObj) {
259    jobject ownCanvasObj = env->GetObjectField(surfaceObj, gSurfaceClassInfo.mCanvas);
260    if (!env->IsSameObject(ownCanvasObj, canvasObj)) {
261        doThrowIAE(env);
262        return;
263    }
264
265    sp<Surface> surface(reinterpret_cast<Surface *>(nativeObject));
266    if (!Surface::isValid(surface)) {
267        return;
268    }
269
270    // detach the canvas from the surface
271    SkCanvas* nativeCanvas = reinterpret_cast<SkCanvas*>(
272            env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
273    int saveCount = env->GetIntField(surfaceObj, gSurfaceClassInfo.mCanvasSaveCount);
274    nativeCanvas->restoreToCount(saveCount);
275    nativeCanvas->setBitmapDevice(SkBitmap());
276    env->SetIntField(surfaceObj, gSurfaceClassInfo.mCanvasSaveCount, 0);
277
278    // unlock surface
279    status_t err = surface->unlockAndPost();
280    if (err < 0) {
281        doThrowIAE(env);
282    }
283}
284
285// ----------------------------------------------------------------------------
286
287static jint nativeCopyFrom(JNIEnv* env, jobject surfaceObj,
288        jint nativeObject, jint surfaceControlNativeObj) {
289    /*
290     * This is used by the WindowManagerService just after constructing
291     * a Surface and is necessary for returning the Surface reference to
292     * the caller. At this point, we should only have a SurfaceControl.
293     */
294
295    sp<SurfaceControl> ctrl(reinterpret_cast<SurfaceControl *>(surfaceControlNativeObj));
296    sp<Surface> other(ctrl->getSurface());
297    if (other != NULL) {
298        other->incStrong(surfaceObj);
299    }
300
301    sp<Surface> sur(reinterpret_cast<Surface *>(nativeObject));
302    if (sur != NULL) {
303        sur->decStrong(surfaceObj);
304    }
305
306    return int(other.get());
307}
308
309static jint nativeReadFromParcel(JNIEnv* env, jobject surfaceObj,
310        jint nativeObject, jobject parcelObj) {
311    Parcel* parcel = parcelForJavaObject(env, parcelObj);
312    if (parcel == NULL) {
313        doThrowNPE(env);
314        return 0;
315    }
316    sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
317    if (self != NULL) {
318        self->decStrong(surfaceObj);
319    }
320    sp<Surface> sur(Surface::readFromParcel(*parcel));
321    if (sur != NULL) {
322        sur->incStrong(surfaceObj);
323    }
324    return int(sur.get());
325}
326
327static void nativeWriteToParcel(JNIEnv* env, jobject surfaceObj,
328        jint nativeObject, jobject parcelObj) {
329    Parcel* parcel = parcelForJavaObject(env, parcelObj);
330    if (parcel == NULL) {
331        doThrowNPE(env);
332        return;
333    }
334    sp<Surface> self(reinterpret_cast<Surface *>(nativeObject));
335    Surface::writeToParcel(self, parcel);
336}
337
338// ----------------------------------------------------------------------------
339
340static JNINativeMethod gSurfaceMethods[] = {
341    {"nativeCreateFromSurfaceTexture", "(Landroid/graphics/SurfaceTexture;)I",
342            (void*)nativeCreateFromSurfaceTexture },
343    {"nativeRelease", "(I)V",
344            (void*)nativeRelease },
345    {"nativeDestroy", "(I)V",
346            (void*)nativeDestroy },
347    {"nativeIsValid", "(I)Z",
348            (void*)nativeIsValid },
349    {"nativeIsConsumerRunningBehind", "(I)Z",
350            (void*)nativeIsConsumerRunningBehind },
351    {"nativeLockCanvas", "(ILandroid/graphics/Rect;)Landroid/graphics/Canvas;",
352            (void*)nativeLockCanvas },
353    {"nativeUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
354            (void*)nativeUnlockCanvasAndPost },
355    {"nativeCopyFrom", "(II)I",
356            (void*)nativeCopyFrom },
357    {"nativeReadFromParcel", "(ILandroid/os/Parcel;)I",
358            (void*)nativeReadFromParcel },
359    {"nativeWriteToParcel", "(ILandroid/os/Parcel;)V",
360            (void*)nativeWriteToParcel },
361};
362
363int register_android_view_Surface(JNIEnv* env)
364{
365    int err = AndroidRuntime::registerNativeMethods(env, "android/view/Surface",
366            gSurfaceMethods, NELEM(gSurfaceMethods));
367
368    jclass clazz = env->FindClass("android/view/Surface");
369    gSurfaceClassInfo.clazz = jclass(env->NewGlobalRef(clazz));
370    gSurfaceClassInfo.mNativeObject =
371            env->GetFieldID(gSurfaceClassInfo.clazz, "mNativeObject", "I");
372    gSurfaceClassInfo.mGenerationId =
373            env->GetFieldID(gSurfaceClassInfo.clazz, "mGenerationId", "I");
374    gSurfaceClassInfo.mCanvas =
375            env->GetFieldID(gSurfaceClassInfo.clazz, "mCanvas", "Landroid/graphics/Canvas;");
376    gSurfaceClassInfo.mCanvasSaveCount =
377            env->GetFieldID(gSurfaceClassInfo.clazz, "mCanvasSaveCount", "I");
378    gSurfaceClassInfo.ctor = env->GetMethodID(gSurfaceClassInfo.clazz, "<init>", "(I)V");
379
380    clazz = env->FindClass("android/graphics/Canvas");
381    gCanvasClassInfo.mNativeCanvas = env->GetFieldID(clazz, "mNativeCanvas", "I");
382    gCanvasClassInfo.mSurfaceFormat = env->GetFieldID(clazz, "mSurfaceFormat", "I");
383
384    clazz = env->FindClass("android/graphics/Rect");
385    gRectClassInfo.left = env->GetFieldID(clazz, "left", "I");
386    gRectClassInfo.top = env->GetFieldID(clazz, "top", "I");
387    gRectClassInfo.right = env->GetFieldID(clazz, "right", "I");
388    gRectClassInfo.bottom = env->GetFieldID(clazz, "bottom", "I");
389
390    return err;
391}
392
393};
394