public static void CopyTo(this ANDROIDIMAGE src, ref MemoryBitmap <System.Numerics.Vector3> dst)
{
if (dst.Width != src.Width || dst.Height != src.Height)
{
dst = default;
}
if (dst.IsEmpty)
{
dst = new MemoryBitmap <System.Numerics.Vector3>(src.Width, src.Height, Pixel.BGR96F.Format);
}
src._CopyYuv445345To(dst.AsSpanBitmap());
}
public void OnImageAvailable(Android.Media.ImageReader imageReader)
{
Android.Media.Image image = null;
Android.Graphics.Bitmap bitmapFromPlane0 = null;
Android.Graphics.Bitmap bitmapToSave = null;
try
{
image = imageReader.AcquireLatestImage();
if (image != null)
{
Android.Media.Image.Plane[] planes = image.GetPlanes();
if (planes.Length > 0)
{
int rowPadding = planes[0].RowStride - planes[0].PixelStride * mWidth;
bitmapFromPlane0 = Android.Graphics.Bitmap.CreateBitmap
(
width: (mWidth + rowPadding / planes[0].PixelStride), // 此处不能直接采用 Width, 否则保存的图片会出现花屏
height: mHeight,
config: Android.Graphics.Bitmap.Config.Argb8888
);
bitmapFromPlane0.CopyPixelsFromBuffer(planes[0].Buffer);
var imagefileInfo = MyAndroidScreenshot.GetScreenshotFileInfo(mImageFileDateTime, mDirName); // 传入目录名称
if (imagefileInfo.Directory.Exists == false)
{
imagefileInfo.Directory.Create();
}
string imageFile = imagefileInfo.FullName;
// bitmapFromPlane0 多增加的长度减至 屏幕的 Width
bitmapToSave = Android.Graphics.Bitmap.CreateBitmap(bitmapFromPlane0, 0, 0, mWidth, mHeight);
using (System.IO.FileStream stream = new System.IO.FileStream(path: imageFile, System.IO.FileMode.CreateNew))
{
bitmapToSave.Compress(Android.Graphics.Bitmap.CompressFormat.Png, 60, stream); // 压缩图片 // TODO 控制图片质量
stream.Flush();
}
// 发送广播
Android.App.Application.Context.SendBroadcast
(
new Android.Content.Intent
(
action: Android.Content.Intent.ActionMediaScannerScanFile,
uri: Android.Net.Uri.FromFile(new Java.IO.File(imageFile))
)
);
System.Diagnostics.Debug.WriteLine("MyImageReaderListener-OnImageAvailable - 成功保存屏幕截图");
}
}
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("MyImageReaderListener-OnImageAvailable - 捕获异常");
System.Diagnostics.Debug.WriteLine(e.GetFullInfo());
System.Diagnostics.Debugger.Break();
}
finally
{
if (bitmapFromPlane0 != null)
{
bitmapFromPlane0.Recycle();
bitmapFromPlane0 = null;
}
if (image != null)
{
image.Close();
image = null;
}
MyAndroidScreenshot.GetInstance().ReleaseAfterScreenCaptureSave();
MyAndroidScreenshot.s_IsRunning.Set(false);
}
}
private static void _CopyYuv445345To(this ANDROIDIMAGE src, SpanBitmap dst)
{
// http://werner-dittmann.blogspot.com/2016/03/solving-some-mysteries-about-androids.html
if (src == null)
{
throw new ArgumentNullException(nameof(src));
}
if (src.Format != ANDROIDGFX.ImageFormatType.Yuv420888)
{
throw new ArgumentNullException(nameof(src.Format));
}
if (dst.PixelFormat != Pixel.BGR24.Format)
{
throw new ArgumentNullException(nameof(dst.PixelFormat));
}
var planes = src.GetPlanes();
var yPlane = planes[0].Buffer;
var uPlane = planes[1].Buffer;
var vPlane = planes[2].Buffer;
int total = yPlane.Capacity();
int uvCapacity = uPlane.Capacity();
int width = planes[0].RowStride;
int yPos = 0;
for (int y = 0; y < src.Height; y++)
{
int uvPos = (y >> 1) * width;
var dstRow = dst.UseScanlineBytes(y);
for (int x = 0; x < width; x++)
{
if (uvPos >= uvCapacity - 1)
{
break;
}
if (yPos >= total)
{
break;
}
int y1 = yPlane.Get(yPos++) & 0xff;
/*
* The ordering of the u (Cb) and v (Cr) bytes inside the planes is a
* bit strange. The _first_ byte of the u-plane and the _second_ byte
* of the v-plane build the u/v pair and belong to the first two pixels
* (y-bytes), thus usual YUV 420 behavior. What the Android devs did
* here (IMHO): just copy the interleaved NV21 U/V data to two planes
* but keep the offset of the interleaving.
*/
int u = (uPlane.Get(uvPos) & 0xff) - 128;
int v = (vPlane.Get(uvPos + 1) & 0xff) - 128;
if ((x & 1) == 1)
{
uvPos += 2;
}
// This is the integer variant to convert YCbCr to RGB, NTSC values.
// formulae found at
// https://software.intel.com/en-us/android/articles/trusted-tools-in-the-new-android-world-optimization-techniques-from-intel-sse-intrinsics-to
// and on StackOverflow etc.
int y1192 = 1192 * y1;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
r = (r < 0) ? 0 : ((r > 262143) ? 262143 : r);
g = (g < 0) ? 0 : ((g > 262143) ? 262143 : g);
b = (b < 0) ? 0 : ((b > 262143) ? 262143 : b);
dstRow[x * 3 + 0] = (Byte)(b >> 10);
dstRow[x * 3 + 1] = (Byte)(g >> 10);
dstRow[x * 3 + 2] = (Byte)(r >> 10);
}
}
}
