CalculateConvertSize Method

Summary

Calculates the size required for output buffer.

Syntax

C++/CLI

Python

public static int CalculateConvertSize( 
   int inWidth, 
   int inBitsPerPixel, 
   int outWidth, 
   int outBitsPerPixel 
)

public: 
static int CalculateConvertSize(  
   int inWidth, 
   int inBitsPerPixel, 
   int outWidth, 
   int outBitsPerPixel 
)

def CalculateConvertSize(self,inWidth,inBitsPerPixel,outWidth,outBitsPerPixel):

Parameters

inWidth
Width in pixels of the input image data.

inBitsPerPixel
BitsPerPixel of the input image data.

outWidth
Width in pixels of the desired output image data.

outBitsPerPixel
BitsPerPixel of the desired output image data.

Return Value

The size in bytes of the required output buffer.

Remarks

Use this method to calculate the required size of the output buffer for image data conversions.

Example

This example loads an image at 24 bits per pixel, and creates a new image at 4 bits per pixel, and then uses the Convert method to convert data from 24 bits per pixel to 4 bits per pixel.

using Leadtools; 
using Leadtools.Codecs; 
 
 
public void CalculateConvertSizeExample() 
{ 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_4bits.bmp"); 
 
	using (RasterCodecs codecs = new RasterCodecs()) 
	{ 
		codecs.ThrowExceptionsOnInvalidImages = true; 
 
		// Load the image, at 24 bit per pixel. 
		RasterImage srcImage = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1); 
		Assert.IsNotNull(srcImage); 
		Assert.IsTrue(srcImage.BitsPerPixel == 24); 
 
		// Create a new 4-bit image. 
		using (RasterImage destImage = new RasterImage( 
		   RasterMemoryFlags.Conventional, 
		   srcImage.Width, 
		   srcImage.Height, 
		   4, 
		   srcImage.Order, 
		   srcImage.ViewPerspective, 
		   srcImage.GetPalette(), 
		   IntPtr.Zero, 
		   0)) 
		{ 
			Assert.IsNotNull(destImage); 
			Assert.IsTrue(destImage.BitsPerPixel == 4); 
 
			int bufferSize = RasterBufferConverter.CalculateConvertSize( 
			   srcImage.Width, 
			   srcImage.BitsPerPixel, 
			   destImage.Width, 
			   destImage.BitsPerPixel); 
 
			// Allocate the buffer in unmanaged memory 
			IntPtr buffer = Marshal.AllocHGlobal(bufferSize); 
			Assert.IsFalse(buffer == IntPtr.Zero); 
 
			// Process each row from srcImage to destImage. 
			srcImage.Access(); 
			destImage.Access(); 
 
			for (int i = 0; i < srcImage.Height; i++) 
			{ 
				srcImage.GetRow(i, buffer, srcImage.BytesPerLine); 
				RasterBufferConverter.Convert( 
				   buffer, 
				   srcImage.Width, 
				   srcImage.BitsPerPixel, 
				   destImage.BitsPerPixel, 
				   srcImage.Order, 
				   destImage.Order, 
				   null, 
				   null, 
				   0, 
				   8, 
				   0, 
				   RasterConvertBufferFlags.None); 
				destImage.SetRow(i, buffer, destImage.BytesPerLine); 
			} 
 
			destImage.Release(); 
			srcImage.Release(); 
 
			// Save the destination image back to disk 
			codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 4); 
 
			// Clean up 
			Marshal.FreeHGlobal(buffer); 
		} 
	} 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterBufferConverter Class

RasterBufferConverter Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

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