67 lines
2.0 KiB
C#
67 lines
2.0 KiB
C#
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using System;
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using System.IO;
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using System.Linq;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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public class RTSPPreviewRenderer : IDisposable
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{
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private Canvas _canvas;
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private Image _imageControl;
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private WriteableBitmap _bitmap;
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public bool Adaptive { get; set; } = true;
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public RTSPPreviewRenderer(Canvas canvas)
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{
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_canvas = canvas ?? throw new ArgumentNullException(nameof(canvas));
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_imageControl = new Image();
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_canvas.Children.Add(_imageControl);
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Canvas.SetLeft(_imageControl, 0);
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Canvas.SetTop(_imageControl, 0);
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}
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/// <summary>更新帧到 Canvas</summary>
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public void UpdateFrame(byte[] pixelData, int width, int height)
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{
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if (_bitmap == null || _bitmap.PixelWidth != width || _bitmap.PixelHeight != height)
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{
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_bitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Bgra32, null);
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_imageControl.Source = _bitmap;
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}
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_bitmap.Lock();
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_bitmap.WritePixels(new System.Windows.Int32Rect(0, 0, width, height), pixelData, width * 4, 0);
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_bitmap.AddDirtyRect(new System.Windows.Int32Rect(0, 0, width, height));
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_bitmap.Unlock();
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// 自动适应 Canvas
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if (Adaptive)
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{
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double scaleX = _canvas.ActualWidth / width;
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double scaleY = _canvas.ActualHeight / height;
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double scale = Math.Min(scaleX, scaleY);
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_imageControl.Width = width * scale;
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_imageControl.Height = height * scale;
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Canvas.SetLeft(_imageControl, (_canvas.ActualWidth - _imageControl.Width) / 2);
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Canvas.SetTop(_imageControl, (_canvas.ActualHeight - _imageControl.Height) / 2);
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}
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else
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{
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_imageControl.Width = _canvas.ActualWidth;
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_imageControl.Height = _canvas.ActualHeight;
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Canvas.SetLeft(_imageControl, 0);
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Canvas.SetTop(_imageControl, 0);
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}
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}
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public void Dispose()
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{
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_bitmap = null;
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}
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}
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