英文:
Is it possible to synchronize the content draw by OpenGL and the position of a View in Android?
问题
在FrameLayout中有两个视图：
- SurfaceView
- View
SurfaceView的内容是在另一个线程中使用OpenGL绘制的：
- 从Java将SurfaceView的Surface发送到C++
- 创建ANativeWindow：ANativeWindow_fromSurface(env, surface);
- 创建surface：eglCreateWindowSurface()
- 其他准备工作并绘制到surface上
- 在主线程中为View设置LayoutParams()
我试图使View的位置与SurfaceView的内容对齐。例如，如果我绘制一个移动的正方形，我希望在正方形移动时将View的位置设置为与正方形匹配。
但是当我尝试时，View在SurfaceView的内容之前移动。
我尝试用TextureView或使用ImageReader提供surface给本地的CustomView替换SurfaceView，但没有成功。
有人有办法实现吗？
英文:
There are 2 views in a FrameLayout:
- SurfaceView
- View
The content of SurfaceView is drawn using OpenGL in another thread:
- Send the Surface of SurfaceView from java to c++
- Create ANativeWindow: ANativeWindow_fromSurface(env, surface);
- Create surface: eglCreateWindowSurface()
- Other preparation stuff and draw to the surface
- setLayoutParams() for the View in the main thread.
I'm trying to make the position of View align with the content of SurfaceView. E.g if I draw a moving square, I want to set the position of View to match the square when it is moving.
But when I try it, the View moves before the content of SurfaceView.
I've tried to replace SurfaceView with a TextureView or a CustomView which uses ImageReader to provide surface to native, but no luck.
Does anyone have an idea how to make it possible?
答案1
得分: 0
我通过使用ImageReader的Surface来完成了这个操作：
- 在绘制之前，将位置和纳秒时间从工作线程发送到主线程。
- 绘制到
ImageReader的Surface上。 - 通过
ImageReader.OnImageAvailableListener获取Image。 - 获取
Image.getTimestamp()的值，这是创建Image时的纳秒时间。将其与之前的纳秒时间进行比较，以获取相应的位置。更新位置并将相应的Image绘制到View上。 - 在
View.onDraw之后，由Choreographer.FrameCallback在屏幕上绘制Image后关闭Image。
英文:
I was able to do it by using a surface from ImageReader:
- Before drawing, send the position and nano time from worker thread to main thread.
- Draw to the
SurfaceofImageReader - Acquire the
ImagefromImageReader.OnImageAvailableListener - Get the
Image.getTimestamp()value, this is nano time when theImageis created. Compare it with nano time from earlier to get the corresponding position. Update the position and draw the correspondingImageto theView. - Close the
Imageafter it is drawn on screen by theChoreographer.FrameCallbackafterView.onDraw.
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