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提交 0acb3957 编写于 作者: A andrew0229 提交者： Andrew0229
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fixed 68358adc from https://gitee.com/andrew0229/docs/pulls/10675 

update nativeWindow guidelines
Signed-off-by: Nandrew0229 <zhangzhao62@huawei.com>
上级 45d91f39
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zh-cn/application-dev/napi/native-window-guidelines.md
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## 场景介绍
NativeWindow是`OpenHarmony`**本地平台化窗口**，包括从`Surface`构建`NativeWindow`，从`SurfaceBuffer`构建出`NativeWindowBuffer`的能力，开发者可以通过`NativeWindow`接口进行申请和提交`Buffer`。
NativeWindow是`OpenHarmony`**本地平台化窗口**，表示图形队列的生产者端。接口能力包括从`Surface`构建`NativeWindow`的能力，从`SurfaceBuffer`构建出`NativeWindowBuffer`的能力，开发者可以通过`NativeWindow`接口进行申请和提交`Buffer`。
针对NativeWindow，常见的开发场景如下：
* 通过`Native C++`代码绘制内容并显示在屏幕上
* 在适配EGL层的`eglswapbuffer`接口时，进行提交和申请`Buffer`
* 通过`NativeWindow`提供的`NAPI`接口申请图形`Buffer`，并将生产图形内容写入图形`Buffer`，最终提交`Buffer`到图形队列
* 在适配EGL层的`eglswapbuffer`接口时，进行申请和提交`Buffer`
## 接口说明
| 接口名 | 描述 |
| -------- | -------- |
| OH_NativeWindow_CreateNativeWindowFromSurface (void \*pSurface) | 创建NativeWindow实例，每次调用都会产生一个新的NativeWindow实例。 |
| OH_NativeWindow_DestroyNativeWindow (struct NativeWindow \*window) | 将NativeWindow对象的引用计数减1，当引用计数为0的时候，该NativeWindow对象会被析构掉。 |
| OH_NativeWindow_DestroyNativeWindow (OHNativeWindow \*window) | 将NativeWindow对象的引用计数减1，当引用计数为0的时候，该NativeWindow对象会被析构掉。 |
| OH_NativeWindow_CreateNativeWindowBufferFromSurfaceBuffer (void \*pSurfaceBuffer) | 创建NativeWindowBuffer实例，每次调用都会产生一个新的NativeWindowBuffer实例。 |
| OH_NativeWindow_DestroyNativeWindowBuffer (struct NativeWindowBuffer \*buffer) | 将NativeWindowBuffer对象的引用计数减1，当引用计数为0的时候，该NativeWindowBuffer对象会被析构掉。 |
| OH_NativeWindow_NativeWindowRequestBuffer (struct NativeWindow \*window struct NativeWindowBuffer \*\*buffer, int \*fenceFd) | 通过NativeWindow对象申请一块NativeWindowBuffer，用以内容生产。 |
| OH_NativeWindow_NativeWindowFlushBuffer (struct NativeWindow \*window, struct NativeWindowBuffer \*buffer, int fenceFd, Region region) | 通过NativeWindow将生产好内容的NativeWindowBuffer放回到Buffer队列中，用以内容消费。 |
| OH_NativeWindow_NativeWindowCancelBuffer (struct NativeWindow \*window, struct NativeWindowBuffer \*buffer) | 通过NativeWindow将之前申请出来的NativeWindowBuffer返还到Buffer队列中，供下次再申请。 |
| OH_NativeWindow_NativeWindowHandleOpt (struct NativeWindow \*window, int code,...) | 设置/获取NativeWindow的属性，包括设置/获取宽高、内容格式等。 |
| OH_NativeWindow_GetBufferHandleFromNative (struct NativeWindowBuffer \*buffer) | 通过NativeWindowBuffer获取该buffer的BufferHandle指针。 |
| OH_NativeWindow_DestroyNativeWindowBuffer (OHNativeWindowBuffer \*buffer) | 将NativeWindowBuffer对象的引用计数减1，当引用计数为0的时候，该NativeWindowBuffer对象会被析构掉。 |
| OH_NativeWindow_NativeWindowRequestBuffer (OHNativeWindow \*window, OHNativeWindowBuffer \*\*buffer, int \*fenceFd) | 通过NativeWindow对象申请一块NativeWindowBuffer，用以内容生产。 |
| OH_NativeWindow_NativeWindowFlushBuffer (OHNativeWindow \*window, OHNativeWindowBuffer \*buffer, int fenceFd, Region region) | 通过NativeWindow将生产好内容的NativeWindowBuffer放回到Buffer队列中，用以内容消费。 |
| OH_NativeWindow_NativeWindowAbortBuffer (OHNativeWindow \*window, OHNativeWindowBuffer \*buffer) | 通过NativeWindow将之前申请出来的NativeWindowBuffer返还到Buffer队列中，供下次再申请。 |
| OH_NativeWindow_NativeWindowHandleOpt (OHNativeWindow \*window, int code,...) | 设置/获取NativeWindow的属性，包括设置/获取宽高、内容格式等。 |
| OH_NativeWindow_GetBufferHandleFromNative (OHNativeWindowBuffer \*buffer) | 通过NativeWindowBuffer获取该buffer的BufferHandle指针。 |
| OH_NativeWindow_NativeObjectReference (void \*obj) | 增加一个NativeObject的引用计数。 |
| OH_NativeWindow_NativeObjectUnreference (void \*obj) | 减少一个NativeObject的引用计数，当引用计数减少为0时，该NativeObject将被析构掉。 |
| OH_NativeWindow_GetNativeObjectMagic (void \*obj) | 获取NativeObject的MagicId。 |
| OH_NativeWindow_NativeWindowSetScalingMode (OHNativeWindow \*window, uint32_t sequence, OHScalingMode scalingMode) | 设置NativeWindow的缩放模式。 |
| OH_NativeWindow_NativeWindowSetMetaData(OHNativeWindow \*window, uint32_t sequence, int32_t size, const OHHDRMetaData \*metaData) | 设置NativeWindow的HDR静态元数据。 |
| OH_NativeWindow_NativeWindowSetMetaDataSet(OHNativeWindow \*window, uint32_t sequence, OHHDRMetadataKey key, int32_t size, const uint8_t \*metaData) | 设置NativeWindow的HDR静态元数据集。 |
| OH_NativeWindow_NativeWindowSetTunnelHandle(OHNativeWindow \*window, const OHExtDataHandle \*handle) | 设置NativeWindow的TunnelHandle。 |
详细的接口说明请参考[native_window](../reference/native-apis/_native_window.md)。
## 开发步骤
以下步骤描述了在**OpenHarmony**中如何利用`OH_NativeXComponent`通过`Native C++`代码绘制内容并显示在屏幕上。
以下步骤描述了在**OpenHarmony**中如何使用`NativeWindow`提供的`NAPI`接口，申请图形`Buffer`，并将生产图形内容写入图形`Buffer`后，最终提交`Buffer`到图形队列。
1. **在页面中定义XComponent组件**，在`index.ets`中定义一个`texture`类型的`XComponent`，用于显示内容。
```js
XComponent({ id: 'xcomponentId', type: 'texture', libraryname: 'nativerender'})
.borderColor(Color.Red)
.borderWidth(5)
.onLoad(() => {})
.onDestroy(() => {})
```
2. **获取OH_NativeXComponent实例**。使用 `napi_get_named_property` 接口获取一个`OH_NativeXComponent`实例 `nativeXComponent`，通过注册该实例的回调接口获取`NativeWindow`实例。
1. **获取NativeWindow实例**。例如，使用`Surface`创建`NativeWindow`实例。
```c++
sptr<OHOS::Surface> cSurface = Surface::CreateSurfaceAsConsumer();
sptr<IBufferConsumerListener> listener = new BufferConsumerListenerTest();
cSurface->RegisterConsumerListener(listener);
sptr<OHOS::IBufferProducer> producer = cSurface->GetProducer();
sptr<OHOS::Surface> pSurface = Surface::CreateSurfaceAsProducer(producer);
OHNativeWindow* nativeWindow = OH_NativeWindow_CreateNativeWindow(&pSurface);
```
2. **设置NativeWindowBuffer的属性**。使用`OH_NativeWindow_NativeWindowHandleOpt`设置`NativeWindowBuffer`的属性。
```c++
// 定义 napi instance
napi_value exportInstance = nullptr;
// 定义一个 OH_NativeXComponent 实例
OH_NativeXComponent *nativeXComponent = nullptr;
// 通过 OH_NATIVE_XCOMPONENT_OBJ export 实例
napi_getname_property(env, exports, OH_NATIVE_XCOMPONENT_OBJ, &exportInstance);
// 将 napi instance 转化为 OH_NativeXComponent 实例
napi_unwarp(env, exportInstance, reinterpret_cast<void**>(&nativeXComponent));
// 设置 NativeWindowBuffer 的读写场景
int code = SET_USAGE;
int32_t usage = BUFFER_USAGE_CPU_READ | BUFFER_USAGE_CPU_WRITE | BUFFER_USAGE_MEM_DMA;
int32_t ret = OH_NativeWindow_NativeWindowHandleOpt(nativeWindow, code, usage);
// 设置 NativeWindowBuffer 的宽高
code = SET_BUFFER_GEOMETRY;
int32_t width = 0x100;
int32_t height = 0x100;
ret = OH_NativeWindow_NativeWindowHandleOpt(nativeWindow, code, width, height);
// 设置 NativeWindowBuffer 的步长
code = SET_STRIDE;
int32_t stride = 0x8;
ret = OH_NativeWindow_NativeWindowHandleOpt(nativeWindow, code, stride);
// 设置 NativeWindowBuffer 的格式
code = SET_FORMAT;
int32_t format = PIXEL_FMT_RGBA_8888;
ret = OH_NativeWindow_NativeWindowHandleOpt(nativeWindow, code, format);
```
3. **定义回调函数OnSurfaceCreated**。用于在`Surface`创建时，通过回调函数初始化开发者的渲染环境，例如`Skia`渲染环境。并将要显示的内容写入`NativeWindow`：
3. **从图形队列申请NativeWindowBuffer**。
```c++
struct NativeWindowBuffer* buffer = nullptr;
int fenceFd;
// 通过 OH_NativeWindow_NativeWindowRequestBuffer 获取 NativeWindowBuffer 实例
OH_NativeWindow_NativeWindowRequestBuffer(nativeWindow_, &buffer, &fenceFd);
// 通过 OH_NativeWindow_GetNativeBufferHandleFromNative 获取 buffer 的 handle
BufferHandle* bufferHandle = OH_NativeWindow_GetNativeBufferHandleFromNative(buffer);
```
4. **将生产的内容写入NativeWindowBuffer**。
```c++
void OnSurfaceCreatedCB(NativeXComponent* component, void* window) {
//获取 native window 的宽高
uint64_t width_ = 0, height_ = 0;
OH_NativeXComponent_GetXComponentSize(nativeXComponent, window, &width_, &height_);
// 将void* 转换为 NativeWindow 实例，NativeWindow 定义在 native_window/external_window.h 中
NativeWindow* nativeWindow_ = (NativeWindow*)(window);
// 通过 OH_NativeWindow_NativeWindowHandleOpt 设置或者获取NativeWindow的属性
// 1.通过 SET_USAGE 设置 Native Window 的 usage 属性, 例如：HBM_USE_CPU_READ
OH_NativeWindow_NativeWindowHandleOpt(nativeWindow_, SET_USAGE, HBM_USE_CPU_READ | HBM_USE_CPU_WRITE |HBM_USE_MEM_DMA);
// 2.通过 SET_BUFFER_GEOMETRY 设置 Native Window 的 宽高属性
OH_NativeWindow_NativeWindowHandleOpt(nativeWindow_, SET_BUFFER_GEOMETRY, width_, height_);
// 3.通过 SET_FORMAT 设置 Native Window 的 format 属性, 例如：PIXEL_FMT_RGBA_8888
OH_NativeWindow_NativeWindowHandleOpt(nativeWindow_, SET_FORMAT, PIXEL_FMT_RGBA_8888);
// 4.通过 SET_STRIDE 设置 Native Window 的 stride 属性
OH_NativeWindow_NativeWindowHandleOpt(nativeWindow_, SET_STRIDE, 0x8);
// 通过 OH_NativeWindow_NativeWindowRequestBuffer 获取 NativeWindowBuffer 实例
struct NativeWindowBuffer* buffer = nullptr;
int fenceFd;
OH_NativeWindow_NativeWindowRequestBuffer(nativeWindow_, &buffer, &fenceFd);
// 通过 OH_NativeWindow_GetNativeBufferHandleFromNative 获取 buffer handle
BufferHandle* bufferHandle = OH_NativeWindow_GetNativeBufferHandleFromNative(buffer);
// 通过 BufferHandle 创建Skia Bitmap
SkBitmap bitmap;
SkImageInfo imageInfo = ...
bitmap.setInfo(imageInfo, bufferHandle->stride);
bitmap.setPixels(bufferHandle->virAddr);
//创建 Skia Canvas 并将内容写入native window
...
//写入完成后，通过OH_NativeWindow_NativeWindowFlushBuffer 提交给消费者使用，例如：显示在屏幕上
Region region{nullptr, 0};
OH_NativeWindow_NativeWindowFlushBuffer(nativeWindow_, buffer, fenceFd, region)
auto image = static_cast<uint8_t *>(buffer->sfbuffer->GetVirAddr());
static uint32_t value = 0x00;
value++;
uint32_t *pixel = static_cast<uint32_t *>(image);
for (uint32_t x = 0; x < width; x++) {
for (uint32_t y = 0; y < height; y++) {
*pixel++ = value;
}
}
```
4. **注册回调函数OnSurfaceCreated等**。使用 `OH_NativeXComponent_RegisterCallback` 接口注册上一步中创建的回调函数。
5. **提交NativeWindowBuffer到图形队列**。
```c++
OH_NativeXComponent_Callback &callback_;
callback_->OnSurfaceCreated = OnSurfaceCreatedCB;
callback_->OnSurfaceChanged = OnSurfaceChangedCB;
callback_->OnSurfaceDestroyed = OnSurfaceDestroyedCB;
callback_->DispatchTouchEvent = DispatchTouchEventCB;
OH_NativeXComponent_RegisterCallback(nativeXComponent, callback_)
// 设置刷新区域，如果Region中的Rect为nullptr,或者rectNumber为0，则认为NativeWindowBuffer全部有内容更改。
Region region{nullptr, 0};
// 通过OH_NativeWindow_NativeWindowFlushBuffer 提交给消费者使用，例如：显示在屏幕上。
OH_NativeWindow_NativeWindowFlushBuffer(nativeWindow_, buffer, fenceFd, region);
```
## 相关实例
针对NativeWindow的使用，有以下相关实例可供参考：
- [使用NativeWindow接口获取Buffer](https://gitee.com/openharmony/graphic_graphic_2d/blob/master/rosen/samples/hello_native_window/hello_native_window.cpp)
- [使用NativeWindow接口获取并提交Buffer](https://gitee.com/openharmony/graphic_graphic_2d/blob/master/rosen/samples/hello_native_window/hello_native_window.cpp)
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