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CalculateConvertSize Method
See Also  Example
Leadtools Namespace > RasterBufferConverter Class : CalculateConvertSize Method



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.
Calculates the size required for output buffer.

Syntax

Visual Basic (Declaration)  
Public Shared Function CalculateConvertSize( _
   ByVal inWidth As Integer, _
   ByVal inBitsPerPixel As Integer, _
   ByVal outWidth As Integer, _
   ByVal outBitsPerPixel As Integer _
) As Integer
Visual Basic (Usage) Copy Code
Dim inWidth As Integer
Dim inBitsPerPixel As Integer
Dim outWidth As Integer
Dim outBitsPerPixel As Integer
Dim value As Integer
 
value = RasterBufferConverter.CalculateConvertSize(inWidth, inBitsPerPixel, outWidth, outBitsPerPixel)
C#  
public static int CalculateConvertSize( 
   int inWidth,
   int inBitsPerPixel,
   int outWidth,
   int outBitsPerPixel
)
C++/CLI  
public:
static int CalculateConvertSize( 
   int inWidth,
   int inBitsPerPixel,
   int outWidth,
   int 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.

Example

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

Visual Basic Copy Code
Public Sub CalculateConvertSizeExample()
 RasterCodecs.Startup()
 Dim codecs As RasterCodecs = New RasterCodecs()
 codecs.ThrowExceptionsOnInvalidImages = True

 Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"
 Dim destFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_4bits.bmp"

 ' Load the image, at 24 bit per pixel.
 Dim srcImage As RasterImage = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1)
 Debug.Assert(srcImage.BitsPerPixel = 24)

 ' Create a new 4-bit image.
 Dim destImage As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, srcImage.Width, srcImage.Height, 4, srcImage.Order, srcImage.ViewPerspective, srcImage.GetPalette(), IntPtr.Zero, 0)
 Debug.Assert(destImage.BitsPerPixel = 4)

 Dim bufferSize As Integer = RasterBufferConverter.CalculateConvertSize(srcImage.Width, srcImage.BitsPerPixel, destImage.Width, destImage.BitsPerPixel)

 ' Allocate the buffer in unmanaged memory
 Dim buffer As IntPtr = Marshal.AllocHGlobal(bufferSize)

 ' Process each row from srcImage to destImage.
 srcImage.Access()
 destImage.Access()

 Dim i As Integer = 0
 Do While i < srcImage.Height
    srcImage.GetRow(i, buffer, srcImage.BytesPerLine)
    RasterBufferConverter.Convert(buffer, srcImage.Width, srcImage.BitsPerPixel, destImage.BitsPerPixel, srcImage.Order, destImage.Order, Nothing, Nothing, 0, 8, 0, RasterConvertBufferFlags.None)
    destImage.SetRow(i, buffer, destImage.BytesPerLine)
    i += 1
 Loop

 destImage.Release()
 srcImage.Release()

 ' Save the destination image back to disk
 codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 4)

 ' Clean up
 Marshal.FreeHGlobal(buffer)
 srcImage.Dispose()
 destImage.Dispose()
 RasterCodecs.Shutdown()
      End Sub
C# Copy Code
public void CalculateConvertSizeExample() 
{ 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"; 
   string destFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_4bits.bmp"; 
 
   // Load the image, at 24 bit per pixel. 
   RasterImage srcImage = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1); 
   Debug.Assert(srcImage.BitsPerPixel == 24); 
 
   // Create a new 4-bit image. 
   RasterImage destImage = new RasterImage( 
      RasterMemoryFlags.Conventional, 
      srcImage.Width, 
      srcImage.Height, 
      4, 
      srcImage.Order, 
      srcImage.ViewPerspective, 
      srcImage.GetPalette(), 
      IntPtr.Zero, 
      0); 
   Debug.Assert(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); 
 
   // 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); 
   srcImage.Dispose(); 
   destImage.Dispose(); 
   RasterCodecs.Shutdown(); 
}

Remarks

You can use this method to calculate the required size of the output buffer for image data conversions.

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also