CombineFastCommand Class

Summary

Combines image data from two images (source and destination), letting you specify the areas to be combined and the operations to be performed when combining the data.

Syntax

Objective-C

C++

Java

public class CombineFastCommand : RasterCommand

Public Class CombineFastCommand  
   Inherits RasterCommand

@interface LTCombineFastCommand : LTRasterCommand

public class CombineFastCommand extends RasterCommand

public ref class CombineFastCommand : public RasterCommand

Remarks

As an example, suppose you use SpatialFilterCommand class to apply an edge detection filter. You can then use this class to combine the resulting image with the original one to produce an image with hard edges.

The CombineFastCommand class works by combining the image in the DestinationImage property with the image passed to the Run method. The DestinationImage will then hold the result of the combine operation.

The CombineFastCommand flags are divided into four groupings: source (SRC) flags, destination (DST) flags, operation (OP) flags, and resulting image (RES) flags. The flags apply only to the defined rectangles (not necessarily the whole image). The flags are applied in the following order:

Operations on the source and destination rectangles are applied. These are implemented at the same time.
Combining operations are performed.
Operations on the resulting rectangle are applied.

You can use a bitwise OR ( ¦ ) to specify one flag from each group.

Group	Flags
Flags that define treatment of the source rectangle	None, SourceNot, Source0, Source1
Flags that define treatment of the destination rectangle	DestinationNot, Destination0, Destination1
Flags that define the operation to use when combining the data	OperationOr, OperationXor, OperationAdd, OperationSubtractSource, OperationSubtractDestination, OperationMultiply, OperationDivideSource, OperationDivideDestination, OperationAverage, OperationMinimum, OperationMaximum
Flags that define treatment of the resulting image rectangle	ResultNot, Result0, Result1, SourceCopy

Certain flags when combined have no meaning:

Setting the flag (RES flags) to either CB_RES_0 or CB_RES_1 will render the rest of the flags useless.
Setting the SRC and DST flags to CB_SRC_0 and CB_DST_0 respectively, then the OP flags (the operation flags) will be useless.
Setting the SRC and DST flags to CB_SRC_1 and CB_DST_1 respectively, then the OP flags (the operation flags) will be useless.
Setting the flag (OP Flags) to CB_OP_ADD or CB_OP_OR or CB_OP_MAX, while setting the (SRC flags) to CB_SRC_1 will make the (DST flags) useless.
Setting the flag (OP Flags) to CB_OP_ADD or CB_OP_OR or CB_OP_MAX, while setting the (DST flags) to CB_SRC_1 will make the (SRC flags) useless.
Setting the flag (OP Flags) to CB_OP_AND or CB_OP_SUBDST or CB_OP_MIN, while setting the (SRC flags) to CB_SRC_0 will make the (DST flags) useless.
Setting the flag (OP Flags) to CB_OP_AND or CB_OP_SUBSRC or CB_OP_MIN, while setting the (DST flags) to CB_SRC_0 will make the (SRC flags) useless.

For more options, like specifying the color plane, use CombineCommand.

For more information, refer to Processing an Image.

Example

The following example loads two images and combines them using an "AND" operation.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void CombineFastCommandExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string srcFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image2.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "CombineFastCommand.bmp"); 
 
	// Load the source images from disk 
	RasterImage srcImage = codecs.Load(srcFileName1); 
	RasterImage destImage = codecs.Load(srcFileName2); 
 
	// Combine them 
	CombineFastCommand command = new CombineFastCommand(); 
 
	// Specify a position in the destination image 
	command.DestinationRectangle = new LeadRect( 
	   destImage.Width / 8, 
	   destImage.Height / 8, 
	   destImage.Width, 
	   destImage.Height); 
	command.SourcePoint = LeadPoint.Empty; 
	command.DestinationImage = destImage; 
	command.Flags = CombineFastCommandFlags.OperationAdd | CombineFastCommandFlags.Destination0; 
	command.Run(srcImage); 
 
	// Save it to disk 
	codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24); 
 
	// Clean Up 
	destImage.Dispose(); 
	srcImage.Dispose(); 
	codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
 
Public Sub CombineFastCommandExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   Dim srcFileName1 As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim srcFileName2 As String = Path.Combine(LEAD_VARS.ImagesDir, "Image2.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "CombineFastCommand.bmp") 
 
   ' Load the source images from disk 
   Dim srcImage As RasterImage = codecs.Load(srcFileName1) 
   Dim destImage As RasterImage = codecs.Load(srcFileName2) 
 
   ' Combine them 
   Dim command As CombineFastCommand = New CombineFastCommand() 
 
   ' Specify a position in the destination image 
   command.DestinationRectangle = New LeadRect(destImage.Width \ 8, destImage.Height \ 8, destImage.Width, destImage.Height) 
   command.SourcePoint = LeadPoint.Empty 
   command.DestinationImage = destImage 
   command.Flags = CombineFastCommandFlags.OperationAdd Or CombineFastCommandFlags.Destination0 
   command.Run(srcImage) 
 
   ' Save it to disk 
   codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24) 
 
   ' Clean Up 
   destImage.Dispose() 
   srcImage.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

CombineFastCommand Members

Leadtools.ImageProcessing Namespace

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