Android 2.3截屏JNI代码

/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #define LOG_TAG "ScreenCapNative-JNI" //#define LOG_NDEBUG 0 #include "JNIHelp.h" #include "jni.h" #include <utils/Log.h> #include <binder/IPCThreadState.h> #include <binder/ProcessState.h> #include <binder/IServiceManager.h> #include <binder/IMemory.h> #include <surfaceflinger/ISurfaceComposer.h> #include <SkImageEncoder.h> #include <SkBitmap.h> namespace android { static void android_ScreenCap_ScreenCapNative_nativeCaptureScreen(JNIEnv* env, jobject obj, jstring file) { const char *file_path = env->GetStringUTFChars(file, NULL); const String16 name("SurfaceFlinger"); sp<ISurfaceComposer> composer; getService(name, &composer); sp<IMemoryHeap> heap; uint32_t w, h; PixelFormat f; status_t err = composer->captureScreen(0, &heap, &w, &h, &f, 0, 0); if (err != NO_ERROR) { LOGE("screen capture failed: %s\n", strerror(-err)); exit(0); } LOGD("screen capture success: w=%u, h=%u, pixels=%p\n", w, h, heap->getBase()); LOGD("saving file as PNG in %s ...\n", file_path); SkBitmap b; b.setConfig(SkBitmap::kARGB_8888_Config, w, h); b.setPixels(heap->getBase()); SkImageEncoder::EncodeFile(file_path, b, SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality); } static JNINativeMethod gScreenCapNativeMethods[] = { /* name, signature, funcPtr */ { "nativeCaptureScreen", "(Ljava/lang/String;)V", (void*) android_ScreenCap_ScreenCapNative_nativeCaptureScreen }, }; int register_android_ScreenCap_ScreenCapNative(JNIEnv* env) { int res = jniRegisterNativeMethods(env, "com/android/ScreenCap/ScreenCapNative", gScreenCapNativeMethods, NELEM(gScreenCapNativeMethods)); LOG_FATAL_IF(res < 0, "Unable to register native methods."); return 0; } extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved) { JNIEnv* env = NULL; jint result = -1; if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) { LOGE("GetEnv failed!"); return result; } LOG_ASSERT(env, "Could not retrieve the env!"); register_android_ScreenCap_ScreenCapNative(env); return JNI_VERSION_1_4; } } /* namespace android */