RasterBufferResize Class

C#
Visual Basic
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

public class RasterBufferResize

'Declaration
 
Public Class RasterBufferResize

'Usage
 
Dim instance As RasterBufferResize

public sealed class RasterBufferResize

function Leadtools.RasterBufferResize()

public ref class RasterBufferResize

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

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Imports Leadtools
  Imports Leadtools.Codecs

  Public Sub RasterBufferResizeExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_resized.bmp")

   ' Load the source image
   Dim srcImage As RasterImage = codecs.Load(srcFileName)

   Dim destWidth As Integer = srcImage.Width \ 2
   Dim destHeight As Integer = srcImage.Height \ 2

   ' Create the destination image
   Dim destImage As RasterImage = 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
   Dim scanLine As Byte() = New Byte(srcImage.BytesPerLine - 1) {}

   ' resize it
   Dim bufferResize As RasterBufferResize = New RasterBufferResize()

   ' Initialize the resize process.
   bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height)

   srcImage.Access()
   destImage.Access()

   ' Current destination row number
   Dim destRow As Integer = 0
   Dim i As Integer = 0
   Do While i < srcImage.Height
      ' 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
      Dim j As Integer = 0
      Do While j < bufferResize.CopyRepetitions
         destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3)
         destRow += 1
         j += 1
      Loop
      i += 1
   Loop

   destImage.Release()
   srcImage.Release()

   bufferResize.Stop()

   ' Save the destination image
   codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24)

   ' Clean up
   srcImage.Dispose()
   destImage.Dispose()
End Sub

  Public NotInheritable Class LEAD_VARS
  Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
  End Class

using Leadtools;
using Leadtools.Codecs;

      
public void RasterBufferResizeExample()
{
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
   string destFileName = Path.Combine(ImagesPath.Path, "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);
         }
      }
   }
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Examples;

public void RasterBufferResizeExample(RasterImage srcImage, Stream destStream)
{
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   int destWidth = srcImage.Width / 2;
   int destHeight = srcImage.Height / 2;

   // Create the destination image
   RasterImage destImage = new RasterImage(
      RasterMemoryFlags.Conventional,
      destWidth,
      destHeight,
      srcImage.BitsPerPixel,
      srcImage.Order,
      srcImage.ViewPerspective,
      srcImage.GetPalette(),
      null,
      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, destStream, RasterImageFormat.Bmp, 24);

   // Clean up
   srcImage.Dispose();
   destImage.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs

Public Sub RasterBufferResizeExample(ByVal srcImage As RasterImage, ByVal destStream As Stream)
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   Dim destWidth As Integer = srcImage.Width / 2
   Dim destHeight As Integer = srcImage.Height / 2

   ' Create the destination image
   Dim destImage As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, destWidth, destHeight, srcImage.BitsPerPixel, srcImage.Order, srcImage.ViewPerspective, srcImage.GetPalette(), Nothing, 0)

   ' allocate buffer for one scanline from source image
   Dim scanLine As Byte() = New Byte(srcImage.BytesPerLine - 1){}

   ' resize it
   Dim bufferResize As RasterBufferResize = New RasterBufferResize()

   ' Initialize the resize process.
   bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height)

   srcImage.Access()
   destImage.Access()

   ' Current destination row number
   Dim destRow As Integer = 0
   Dim i As Integer = 0
   Do While i < srcImage.Height
      ' 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
      Dim j As Integer = 0
      Do While j < bufferResize.CopyRepetitions
         destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3)
         destRow += 1
         j += 1
      Loop
      i += 1
   Loop

   destImage.Release()
   srcImage.Release()

   bufferResize.Stop()

   ' Save the destination image
   codecs.Save(destImage, destStream, RasterImageFormat.Bmp, 24)

   ' Clean up
   srcImage.Dispose()
   destImage.Dispose()
End Sub

Target Platforms

Reference

RasterBufferResize Members
Leadtools Namespace