C# Imaging.WriteableBitmap类代码示例

        private async void ButtonFilePick_Click(object sender, RoutedEventArgs e)
        {
            var picker = new FileOpenPicker();
            picker.ViewMode = PickerViewMode.Thumbnail;
            picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            picker.FileTypeFilter.Add(".jpg");
            picker.FileTypeFilter.Add(".jpeg");
            picker.FileTypeFilter.Add(".png");

            StorageFile file = await picker.PickSingleFileAsync();


            if (file != null)
            {

                ImageProperties imgProp = await file.Properties.GetImagePropertiesAsync();
                var savedPictureStream = await file.OpenAsync(FileAccessMode.Read);

                //set image properties and show the taken photo
                bitmap = new WriteableBitmap((int)imgProp.Width, (int)imgProp.Height);
                await bitmap.SetSourceAsync(savedPictureStream);
                BBQImage.Source = bitmap;
                BBQImage.Visibility = Visibility.Visible;

                (this.DataContext as BBQRecipeViewModel).imageSource = file.Path;
            }
        }

 public Device(WriteableBitmap bmp)
 {
     this.bmp = bmp;
     // The back buffer size is equal to the number of pixels to draw
     // on screen (width*height) * 4 (R,G,B & Alpha values).
     backBuffer = new byte[bmp.PixelWidth * bmp.PixelHeight * 4];
 }

        public FlagFactory()
        {
            /*
             * CurrentPenStyle = 0   不画东西
            * CurrentPenStyle = 1   油画棒风格
            * CurrentPenStyle = 2   水彩风格
            * CurrentPenStyle = 3   印章风格
            * CurrentPenStyle = 4   橡皮擦
             */

            CurrentPenStyle = 0;
            CurrentPenColor = "";
            CurrentOpacity = 100;

            ScreenHeight = Window.Current.Bounds.Height;
            ScreenWidth = Window.Current.Bounds.Width;
            pointerDictionary = new Dictionary<uint, Polyline>();
            MoveOut = false;
            Pressed = false;
            ReleaseAtOut = false;
            IsDragingPic = false;
            DragPic = null;
            IsGetScreenSucccess = false;
            strContent = "";
            PainterHeight = ScreenHeight - 180;
            PainterWidth = ScreenWidth - 80;
            BitmapOutput = new WriteableBitmap((int)PainterWidth,(int)PainterHeight);
        }

        private static unsafe WriteableBitmap ToWriteableBitmap(this BitmapHolder holder)
        {
            var writeableBitmap = new WriteableBitmap(holder.Width, holder.Height);

            using (var stream = writeableBitmap.PixelBuffer.AsStream())
            {
                int length = holder.Pixels.Length;

                var buffer = new byte[length * 4];
                fixed (int* srcPtr = holder.Pixels)
                {
                    var b = 0;
                    for (var i = 0; i < length; i++, b += 4)
                    {
                        var p = srcPtr[i];
                        buffer[b + 3] = (byte)((p >> 24) & 0xff);
                        buffer[b + 2] = (byte)((p >> 16) & 0xff);
                        buffer[b + 1] = (byte)((p >> 8) & 0xff);
                        buffer[b + 0] = (byte)(p & 0xff);
                    }
                    stream.Write(buffer, 0, length * 4);
                }

            }

            return writeableBitmap;
        }

        async Task<string> OCRAsync(byte[] buffer, uint width, uint height)
        {
            var bitmap = new WriteableBitmap((int)width, (int)height);

            var memoryStream = new MemoryStream(buffer);
            await bitmap.SetSourceAsync(memoryStream.AsRandomAccessStream());

            if (bitmap.PixelHeight < 40 ||
                bitmap.PixelHeight > 2600 ||
                bitmap.PixelWidth < 40 ||
                bitmap.PixelWidth > 2600)
                bitmap = await ResizeImage(bitmap, (uint)(bitmap.PixelWidth * .7), (uint)(bitmap.PixelHeight * .7));

            var ocrResult = await ocrEngine.RecognizeAsync((uint)bitmap.PixelHeight, (uint)bitmap.PixelWidth, bitmap.PixelBuffer.ToArray());

            if (ocrResult.Lines != null)
            {
                var extractedText = new StringBuilder();

                foreach (var line in ocrResult.Lines)
                {
                    foreach (var word in line.Words)
                        extractedText.Append(word.Text + " ");
                    extractedText.Append(Environment.NewLine);
                }

                return extractedText.ToString();
            }

            return null;
        }

        protected override void OnNavigatedTo( NavigationEventArgs e )
        {
            base.OnNavigatedTo( e );

            try {
                // Kinectを開く
                kinect = KinectSensor.GetDefault();
                kinect.Open();

                // 表示のためのデータを作成
                depthFrameDesc = kinect.DepthFrameSource.FrameDescription;

                // Depthリーダーを開く
                depthFrameReader = kinect.DepthFrameSource.OpenReader();
                depthFrameReader.FrameArrived += depthFrameReader_FrameArrived;

                // 表示のためのデータ
                depthBitmap = new WriteableBitmap( depthFrameDesc.Width,
                                                   depthFrameDesc.Height );
                ImageDepth.Source = depthBitmap;

                depthBuffer = new ushort[depthFrameDesc.LengthInPixels];
                depthBitmapBuffer = new byte[depthFrameDesc.LengthInPixels * 4];

                depthPoint = new Point( depthFrameDesc.Width / 2,
                                        depthFrameDesc.Height / 2 );
            }
            catch ( Exception ex ) {
                MessageDialog dlg = new MessageDialog(ex.Message);
                dlg.ShowAsync();
            }
        }

        protected override void OnNavigatedTo( NavigationEventArgs e )
        {
            base.OnNavigatedTo( e );

            try {
                // Kinectを開く
                kinect = KinectSensor.GetDefault();
                if ( kinect == null ) {
                    throw new Exception( "Kinectを開けません" );
                }

                kinect.Open();

                // 赤外線画像の情報を取得する
                infraredFrameDesc = kinect.InfraredFrameSource.FrameDescription;

                // 画像化のためのバッファを作成する
                infraredBitmapBuffer = new byte[infraredFrameDesc.LengthInPixels * 4];
                infraredBitmap = new WriteableBitmap(
                    infraredFrameDesc.Width, infraredFrameDesc.Height );
                ImageInfrared.Source = infraredBitmap;

                infraredBuffer = new ushort[infraredFrameDesc.LengthInPixels];

                // 赤外線画像リーダーを開く
                infraredFrameReader = kinect.InfraredFrameSource.OpenReader();
                infraredFrameReader.FrameArrived += infraredFrameReader_FrameArrived;
            }
            catch ( Exception ex ) {
                MessageDialog dlg = new MessageDialog( ex.Message );
                dlg.ShowAsync();
            }
        }

        protected override void OnNavigatedTo( NavigationEventArgs e )
        {
            base.OnNavigatedTo( e );

            try {
                // Kinectを開く
                kinect = KinectSensor.GetDefault();
                if ( kinect == null ) {
                    throw new Exception( "Kinectを開けません" );
                }

                kinect.Open();

                // カラー画像の情報を作成する(BGRAフォーマット)
                colorFrameDesc = kinect.ColorFrameSource.CreateFrameDescription( ColorImageFormat.Bgra );

                colorBitmap = new WriteableBitmap( colorFrameDesc.Width, colorFrameDesc.Height );
                ImageColor.Source = colorBitmap;

                colorBuffer = new byte[colorFrameDesc.Width * colorFrameDesc.Height * colorFrameDesc.BytesPerPixel];

                // カラーリーダーを開く
                colorFrameReader = kinect.ColorFrameSource.OpenReader();
                colorFrameReader.FrameArrived += colorFrameReader_FrameArrived;
            }
            catch ( Exception ex ) {
                MessageDialog dlg = new MessageDialog( ex.Message );
                dlg.ShowAsync();
            }
        }

 public static WriteableBitmap Overlay(WriteableBitmap bmp, WriteableBitmap overlay, Point location)
 {
     var result = bmp.Clone();
     var size = new Size(overlay.PixelWidth, overlay.PixelHeight);
     result.Blit(new Rect(location, size), overlay, new Rect(new Point(0, 0), size), WriteableBitmapExtensions.BlendMode.Alpha);
     return result;
 }

        private async void PageLoaded(object sender, RoutedEventArgs e)
        {
            var bmp = new WriteableBitmap(1024, 768);
            imageControl.Source = bmp;

            device = new RenderDevice(bmp);
            camera = new Camera
            {
                Position = new Vector3(0, 0, 10.0f),
                Target = Vector3.Zero
            };

            var importer = new BabylonImporter();
            var importedMeshes = await importer.LoadFileAsync("model.babylon");

            meshes = new List<Mesh>();
            foreach(var mesh in importedMeshes)
                meshes.Add(mesh);
            foreach(var mesh in importedMeshes)
            {
                var newMesh = new Mesh("MonkeyClone", mesh.Vertices, mesh.Faces);
                newMesh.Position = new Vector3(2.65f, 0, 0);
                meshes.Add(newMesh);
            }

            CompositionTarget.Rendering += Render;
        }

        protected async override void OnNavigatedTo(NavigationEventArgs e)
        {
            StorageFile imgFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/1.jpg"));
            using (IRandomAccessStream streamIn = await imgFile.OpenReadAsync())
            {
                BitmapDecoder decoder = await BitmapDecoder.CreateAsync(BitmapDecoder.JpegDecoderId, streamIn);
                // 获取像素数据
                PixelDataProvider provd = await decoder.GetPixelDataAsync(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, new BitmapTransform(), ExifOrientationMode.IgnoreExifOrientation, ColorManagementMode.DoNotColorManage);
                byte[] srcData = provd.DetachPixelData();
                // 灰度处理
                for (int i = 0; i < srcData.Length; i += 4)
                {
                    double b = srcData[i];
                    double g = srcData[i + 1];
                    double r = srcData[i + 2];

                    double v = (b + g + r) / 3d;

                    srcData[i] = srcData[i + 1] = srcData[i + 2] = Convert.ToByte(v);
                }

                WriteableBitmap wbitmap = new WriteableBitmap((int)decoder.PixelWidth, (int)decoder.PixelHeight);
                srcData.CopyTo(wbitmap.PixelBuffer);
                this.imgGray.Source = wbitmap;
            }
        }

        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            // Choose the back buffer resolution here.
            WriteableBitmap bmp = new WriteableBitmap(640, 480);

            device = new Device(bmp);

            // Image XAML control
            frontBuffer.Source = bmp;

            mesh.Vertices[0] = new Vector3(-1, 1, 1);
            mesh.Vertices[1] = new Vector3(1, 1, 1);
            mesh.Vertices[2] = new Vector3(-1, -1, 1);
            mesh.Vertices[3] = new Vector3(-1, -1, -1);
            mesh.Vertices[4] = new Vector3(-1, 1, -1);
            mesh.Vertices[5] = new Vector3(1, 1, -1);
            mesh.Vertices[6] = new Vector3(1, -1, 1);
            mesh.Vertices[7] = new Vector3(1, -1, -1);

            camera.Position = new Vector3(0, 0, 10.0f);
            camera.Target = Vector3.Zero;

            // Registering to the XAML rendering Loop
            CompositionTarget.Rendering += CompositionTarget_Rendering;
        }

        public static async Task<WriteableBitmap> StorageFileToWriteableBitmapWithDirection(StorageFile file)
        {
            if (file == null)
                return null;
            using (IRandomAccessStream stream = await file.OpenReadAsync())
            {

                // Create a decoder from the stream. With the decoder, we can get 
                // the properties of the image.
                BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);

                PixelDataProvider pix = await decoder.GetPixelDataAsync(
                BitmapPixelFormat.Bgra8,
                BitmapAlphaMode.Straight,
                new BitmapTransform(),
                ExifOrientationMode.RespectExifOrientation,
                ColorManagementMode.DoNotColorManage);

                byte[] pixels = pix.DetachPixelData();
                WriteableBitmap Bmp = new WriteableBitmap((int)decoder.OrientedPixelWidth, (int)decoder.OrientedPixelHeight);
                Stream pixStream = Bmp.PixelBuffer.AsStream();
                pixStream.Write(pixels, 0, (int)(decoder.OrientedPixelWidth * decoder.OrientedPixelHeight * 4));

                return Bmp;
            }
        }

        public async Task<BitmapSource> LoadImageAsync(Stream imageStream, Uri uri)
        {
            if (imageStream == null)
            {
                return null;
            }

            var stream = new InMemoryRandomAccessStream();
            imageStream.CopyTo(stream.AsStreamForWrite());
            stream.Seek(0);

            BitmapImage bitmap = new BitmapImage();
            await bitmap.SetSourceAsync(stream);

            // convert to a writable bitmap so we can get the PixelBuffer back out later...
            // in case we need to edit and/or re-encode the image.
            WriteableBitmap bmp = new WriteableBitmap(bitmap.PixelHeight, bitmap.PixelWidth);
            stream.Seek(0);
            bmp.SetSource(stream);

            List<Byte> allBytes = new List<byte>();
            byte[] buffer = new byte[4000];
            int bytesRead = 0;
            while ((bytesRead = await imageStream.ReadAsync(buffer, 0, 4000)) > 0)
            {
                allBytes.AddRange(buffer.Take(bytesRead));
            }

            DataContainerHelper.Instance.WriteableBitmapToStorageFile(bmp, uri);

            return bmp;
        }

 private static async Task<WriteableBitmap> read()
 {
     using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.Read))
     {
         BitmapDecoder decoder = await BitmapDecoder.CreateAsync(BitmapDecoder.JpegDecoderId, stream);
         uint width = decoder.PixelWidth;
         uint height = decoder.PixelHeight;
         if (angle % 180 != 0)
         {
             width = decoder.PixelHeight;
             height = decoder.PixelWidth;
         }
         Dictionary<int, BitmapRotation> angles = new Dictionary<int, BitmapRotation>()
         {
             { 0, BitmapRotation.None },
             { 90,  BitmapRotation.Clockwise90Degrees },
             { 180,  BitmapRotation.Clockwise180Degrees },
             { 270, BitmapRotation.Clockwise270Degrees },
             { 360, BitmapRotation.None }
         };
         BitmapTransform transform = new BitmapTransform();
         transform.Rotation = angles[angle];
         PixelDataProvider data = await decoder.GetPixelDataAsync(
         BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, transform,
         ExifOrientationMode.IgnoreExifOrientation, ColorManagementMode.DoNotColorManage);
         bitmap = new WriteableBitmap((int)width, (int)height);
         byte[] buffer = data.DetachPixelData();
         using (Stream pixels = bitmap.PixelBuffer.AsStream())
         {
             pixels.Write(buffer, 0, (int)pixels.Length);
         }
     }
     return bitmap;
 }