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public static void PaintBuffer(RasterImage image,IntPtr hdc,LeadRect srcRect,LeadRect srcClipRect,LeadRect destRect,LeadRect destClipRect,IntPtr buffer,int row,int count,RasterPaintProperties properties)
image
The source image.
hdc
The destination Windows device context handle where the image data will be displayed.
srcRect
A Leadtools.LeadRect object that specifies the part of the image to use as the display source.
The coordinates in the srcRect rectangle are relative to the image. You can pass Rectangle.Empty to use the default, which matches the image.
srcClipRect
A Leadtools.LeadRect object specifies the portion of the display source to paint. Generally, this is used for updating the display when part of the source image has changed.
The coordinates in the srcClipRect rectangle are relative to the image. You can pass Rectangle.Empty to use the default, which matches the image
destRect
A Leadtools.LeadRect object that determines how the source rectangle is scaled and how the image is positioned in the destination hdc handle.
The coordinates in the destRect object are relative to the hdc handle. There is no default for this parameter. You must specify the Leadtools.LeadRect object.
destClipRect
A Leadtools.LeadRect object that specifies the portion of the display rectangle to paint. Generally, this is used for updating changes in the display surface, such as when a user moves another window, uncovering a part of the image that had been covered up.
The coordinates in the destClipRect are relative to the device context handle. You can pass Rectangle.Empty to use the default, which matches the device context handle. In most cases, however, you should use the rectangle returned by the .NET PaintEventArgs.ClipRectangle or Windows WM_PAINT message.
buffer
Pointer to the unmanaged memory buffer that contains the image data to paint
row
The first row to paint. The painted portion of any row may be limited by the rectangle parameters.
count
The number of rows to paint. The painted portion of any row may be limited by the rectangle parameters.
If the image data in buffer is compressed 1-bit data, you can specify the number of lines as a negative value (-lines), as explained in Speeding Up 1-Bit Documents.
properties
Options for the display.
If the hdc handle has fewer colors than the image, this method dithers the output to that display surface without affecting the actual image data.
If destRect is larger or smaller than the image's actual dimensions, then the image will be scaled to fit destRect.
If the image data in buffer is compressed 1-bit data, you can specify the number of lines as a negative value (- row), as explained in Speeding Up 1-Bit Documents.
The following properties are used from this Leadtools.RasterImage:
Except for the buffer specifications, this method uses source and destination rectangles the same as Paint(RasterImage,Graphics,LeadRect,RasterPaintProperties). For a complete explanation, refer to Paint(RasterImage,Graphics,LeadRect,RasterPaintProperties).
You can call PaintBuffer(RasterImage,Graphics,LeadRect,LeadRect,LeadRect,LeadRect,Byte[],Int32,Int32,Int32,RasterPaintProperties) from a callback procedure to paint an image while it is being loaded.
For more information, refer to the following:
using Leadtools;using Leadtools.Codecs;using Leadtools.Drawing;using Leadtools.ImageProcessing;public void PaintBufferExample(){PaintBufferForm f = new PaintBufferForm();f.ShowDialog();}class PaintBufferForm : Form{private RasterImage image;public PaintBufferForm(){// Load the imageRasterCodecs codecs = new RasterCodecs();string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");image = codecs.Load(srcFileName);Text = "PaintBuffer Example";}protected override void Dispose(bool disposing){// Clean upif (disposing){image.Dispose();}base.Dispose(disposing);}protected override void OnPaint(PaintEventArgs e){// Draw the image fit and center on this formLeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom);destRect = RasterImage.CalculatePaintModeRectangle(image.ImageWidth,image.ImageHeight,destRect,RasterPaintSizeMode.Fit,RasterPaintAlignMode.Center,RasterPaintAlignMode.Center);byte[] buffer = new byte[image.BytesPerLine];image.Access();for (int row = 0; row < image.Height; row++){image.GetRow(row, buffer, 0, image.BytesPerLine);RasterImagePainter.PaintBuffer(image, e.Graphics, LeadRect.Empty, LeadRect.Empty, destRect, LeadRect.Empty, buffer, 0, row, 1, RasterPaintProperties.Default);Thread.Sleep(10);}image.Release();base.OnPaint(e);}}static class LEAD_VARS{public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";}