显示系统[1] 简单的Surface测试程序

最新推荐文章于 2023-05-28 17:31:40 发布

原创最新推荐文章于 2023-05-28 17:31:40 发布 · 606 阅读

0 ·

CC 4.0 BY-SA版权

androidframework 同时被 2 个专栏收录

54 篇文章

订阅专栏

android显示系统

4 篇文章

订阅专栏

本文展示了如何使用Android的SurfaceComposerClient和SurfaceControl进行屏幕尺寸的动态调整。通过创建Surface，设置其层级和大小，然后进行锁屏和解锁操作，实现了屏幕从160x240到320x240的平滑变换。这段代码可作为理解SurfaceFlinger服务和图形缓冲区管理的基础测试示例。

路径： AOSP/android-8.1.0_r1/frameworks/native/services/surfaceflinger/tests/resize

mk文件

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \
	SurfaceTest.cpp

LOCAL_SHARED_LIBRARIES := \
	libcutils \
	libutils \
    libui \
    libgui \
    libbinder

LOCAL_MODULE:= SurfaceTest

LOCAL_MODULE_TAGS := tests

include $(BUILD_EXECUTABLE)

cpp代码

#include <cutils/memory.h>

#include <utils/Log.h>

#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>

#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>
#include <android/native_window.h>

using namespace android;

int main(int argc, char** argv)
{
    // set up the thread-pool
    sp<ProcessState> proc(ProcessState::self());
    ProcessState::self()->startThreadPool();

    // create a client to surfaceflinger
    sp<SurfaceComposerClient> client = new SurfaceComposerClient();
    
    sp<SurfaceControl> surfaceControl = client->createSurface(String8("resize"),
            160, 240, PIXEL_FORMAT_RGB_565, 0);

    sp<Surface> surface = surfaceControl->getSurface();

    SurfaceComposerClient::openGlobalTransaction();
    surfaceControl->setLayer(100000);
    SurfaceComposerClient::closeGlobalTransaction();

    ANativeWindow_Buffer outBuffer;
    surface->lock(&outBuffer, NULL);
    ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);
    android_memset16((uint16_t*)outBuffer.bits, 0xF800, bpr*outBuffer.height);
    surface->unlockAndPost();

    surface->lock(&outBuffer, NULL);
    android_memset16((uint16_t*)outBuffer.bits, 0x07E0, bpr*outBuffer.height);
    surface->unlockAndPost();

    SurfaceComposerClient::openGlobalTransaction();
    surfaceControl->setSize(320, 240);
    SurfaceComposerClient::closeGlobalTransaction();

    
    IPCThreadState::self()->joinThreadPool();
    
    return 0;
}