C#
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public static void PaintRegionBuffer(RasterImage image,Graphics graphics,LeadRect srcRect,LeadRect srcClipRect,LeadRect destRect,LeadRect destClipRect,IntPtr buffer,int row,int count,RasterPaintProperties properties)
image
The source image.
graphics
The destination System.Drawing.Graphics object 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 graphics object.
The coordinates in the destRect object are relative to the graphics object. 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 System.Drawing.Graphics object. You can pass Rectangle.Empty to use the default, which matches the System.Drawing.Graphics object. 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 by using a negative value (-lines), as explained in Speeding Up 1-Bit Documents.
properties
Options for the display.
This method works like PaintBuffer(RasterImage,Graphics,LeadRect,LeadRect,LeadRect,LeadRect,Byte[],Int32,Int32,Int32,RasterPaintProperties), except that only the image region is painted.
using Leadtools;using Leadtools.Codecs;using Leadtools.Drawing;using Leadtools.ImageProcessing;public void PaintRegionBufferExample(){PaintRegionBufferForm f = new PaintRegionBufferForm();f.ShowDialog();}class PaintRegionBufferForm : Form{private RasterImage image;public PaintRegionBufferForm(){// Load the imageRasterCodecs codecs = new RasterCodecs();string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");image = codecs.Load(srcFileName);// add a region to the imageimage.AddEllipseToRegion(RasterRegionXForm.Default,new LeadRect(image.Width / 4, image.Height / 4, image.Width / 2, image.Height / 2),RasterRegionCombineMode.Set);Text = "PaintRegionBuffer 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.PaintRegionBuffer(image, e.Graphics, LeadRect.Empty, LeadRect.Empty, destRect, LeadRect.Empty, buffer, 0, row, 1, RasterPaintProperties.Default);Thread.Sleep(20);}image.Release();base.OnPaint(e);}}static class LEAD_VARS{public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";}