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BytesPerLine Property

Summary
Gets the expected stride (number of bytes per line).
Syntax
C#
C++/CLI
Python
[CLSCompliantAttribute(false)] 
public uint BytesPerLine { get; set; } 
[CLSCompliantAttribute(false)] 
public: 
property uint BytesPerLine { 
   uint get(); 
   void set (    uint ); 
} 
BytesPerLine # get and set (RasterPaintDibInfo) 

Property Value

This is usually the number of bytes rounded up to a multiple of 4 bytes.

Remarks

The GDI convention is the number of bytes per line is a multiple of 4 bytes and the extra padding data is unused. But it is possible some cards might not want padding so you can use this property to indicate that. You have to calculate this value from the width of the line that is passed as the second parameter to the RasterImagePaintCallbackFunction.GetDibInfoCallback callback.

Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
 
 
 
public void RasterPaintPropertiesExample() 
{ 
    // Create the form  
    RasterPaintDibInfo_Example f = new RasterPaintDibInfo_Example(); 
    f.ShowDialog(); 
} 
 
public void AddCallBack() 
{ 
    // Load the image 
    RasterCodecs codecs = new RasterCodecs(); 
    string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"); 
    image = codecs.Load(srcFileName); 
 
    // Whenever the Leadtools.RasterImage object needs to paint, 
    // it searches through the RasterPaintProperties.PaintCallbacks list until it finds 
    // a compatible RasterPaintCallbacks object. If the list is empty or there is no compatible 
    // RasterPaintCallbacks object, the default paint functions are used. 
    RasterPaintCallbacks cb = new RasterPaintCallbacks(); 
    cb.SetCallback(RasterImagePaintCallbackFunction.GetDibInfoCallback, DibFunctionDelegate); 
    props = RasterPaintProperties.Default; 
    props.PaintDisplayMode = RasterPaintDisplayModeFlags.FastPaint; 
    props.PaintCallbacks.Add(cb); 
    props.PaintEngine = RasterPaintEngine.GdiPlus; 
}        
 
private object DibFunctionDelegate(RasterImage image, object[] args) 
{ 
    // Describe the image data expected by the custom paint callback: 
    // RasterImagePaintCallbackFunction.GetDibInfoCallback. 
    // 
    // Set and use as needed in application, in this case the values are taken from image. 
    // Then return the updated RasterPaintDibInfo  
 
    rasterPaintDibInfo.BitsPerPixel = image.BitsPerPixel; 
    rasterPaintDibInfo.BytesPerLine =  Convert.ToUInt32(image.BytesPerLine); 
    rasterPaintDibInfo.Flags = RasterPaintDibInfoFlags.LowHighBitValid | RasterPaintDibInfoFlags.IgnoreLut; 
    rasterPaintDibInfo.Order = RasterByteOrder.Bgr; 
    rasterPaintDibInfo.ViewPerspective = RasterViewPerspective.RightTop; 
    return rasterPaintDibInfo; 
} 
 
public void RasterImagePainterPaint(PaintEventArgs e) 
{ 
    // Draw the image fit and center on this form 
    LeadRect 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); 
    RasterImagePainter.Paint(image, e.Graphics, LeadRect.Empty, destRect, props); 
} 
 
protected override void OnPaint(PaintEventArgs e) 
{ 
    RasterImagePainterPaint(e); 
 
    base.OnPaint(e); 
} 
 
protected override void OnDoubleClick(EventArgs e) 
{ 
 
    if ((props.PaintDisplayMode & RasterPaintDisplayModeFlags.ScaleToGray) == RasterPaintDisplayModeFlags.ScaleToGray) 
    { 
        Text = "Normal - doubleclick to change."; 
        props.PaintDisplayMode &= ~RasterPaintDisplayModeFlags.ScaleToGray; 
    } 
    else 
    { 
        Text = "ScaleToGray - doubleclick to change."; 
        props.PaintDisplayMode |= RasterPaintDisplayModeFlags.ScaleToGray; 
    } 
 
    Invalidate(); 
 
    base.OnDoubleClick(e); 
} 
 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2023.3.31
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Drawing Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.