Start Method

Summary

Sets up information for the ResizeBuffer method.

Syntax

C++/CLI

Python

public void Start( 
   int oldWidth, 
   int oldHeight, 
   int newWidth, 
   int newHeight 
)

public: 
void Start(  
   int oldWidth, 
   int oldHeight, 
   int newWidth, 
   int newHeight 
)

def Start(self,oldWidth,oldHeight,newWidth,newHeight):

Parameters

oldWidth
Specifies the original width of the image.

oldHeight
Specifies the original height of the image.

newWidth
Specifies the new width for the image.

newHeight
Specifies the new height for the image.

Remarks

For more information, refer to Introduction to Image Processing With LEADTOOLS.

Example

using Leadtools; 
using Leadtools.Codecs; 
 
 
public void RasterBufferResizeExample() 
{ 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_resized.bmp"); 
 
	using (RasterCodecs codecs = new RasterCodecs()) 
	{ 
		codecs.ThrowExceptionsOnInvalidImages = true; 
 
		// Load the source image 
		using (RasterImage srcImage = codecs.Load(srcFileName)) 
		{ 
			int destWidth = srcImage.Width / 2; 
			int destHeight = srcImage.Height / 2; 
 
			// Create the destination image 
			using (RasterImage destImage = new RasterImage( 
			   RasterMemoryFlags.Conventional, 
			   destWidth, 
			   destHeight, 
			   srcImage.BitsPerPixel, 
			   srcImage.Order, 
			   srcImage.ViewPerspective, 
			   srcImage.GetPalette(), 
			   IntPtr.Zero, 
			   0)) 
			{ 
 
				// allocate buffer for one scanline from source image 
				byte[] scanLine = new byte[srcImage.BytesPerLine]; 
 
				// resize it 
				RasterBufferResize bufferResize = new RasterBufferResize(); 
 
				// Initialize the resize process. 
				bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height); 
 
				srcImage.Access(); 
				destImage.Access(); 
 
				// Current destination row number 
				int destRow = 0; 
				for (int i = 0; i < srcImage.Height; i++) 
				{ 
					// Get a scanline from the source image and resize it 
					srcImage.GetRow(i, scanLine, 0, srcImage.BytesPerLine); 
					bufferResize.ResizeBuffer(scanLine, 0, i, srcImage.BitsPerPixel); 
 
					// Output as many or as few rows as ResizeBuffer supplies 
					for (int j = 0; j < bufferResize.CopyRepetitions; j++) 
					{ 
						destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3); 
						destRow++; 
					} 
				} 
 
				destImage.Release(); 
				srcImage.Release(); 
 
				bufferResize.Stop(); 
 
				// Save the destination image 
				codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24); 
			} 
		} 
	} 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterBufferResize Class

RasterBufferResize Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies