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OptimizeBuffer(RasterCodecs,Byte[],Int32,Int32,ImageOptimizerOptions,ImageOptimizerProgress) Method

Summary

Optimizes a supported image format buffer using the passed optimization options.

Syntax

C++

public byte[] OptimizeBuffer(  
   Leadtools.Codecs.RasterCodecs codecs, 
   byte[] buffer, 
   int offset, 
   int length, 
   Leadtools.Imageoptimization.ImageOptimizerOptions options, 
   Leadtools.Imageoptimization.ImageOptimizerProgress progressCallback 
)

Public Overloads Function OptimizeBuffer( _ 
   ByVal codecs As Leadtools.Codecs.RasterCodecs, _ 
   ByVal buffer() As Byte, _ 
   ByVal offset As Integer, _ 
   ByVal length As Integer, _ 
   ByVal options As Leadtools.Imageoptimization.ImageOptimizerOptions, _ 
   ByVal progressCallback As Leadtools.Imageoptimization.ImageOptimizerProgress _ 
) As Byte()

public: 
array<byte>^ OptimizeBuffer(  
   Leadtools.Codecs.RasterCodecs^ codecs, 
   array<byte>^ buffer, 
   int offset, 
   int length, 
   Leadtools.Imageoptimization.ImageOptimizerOptions options, 
   Leadtools.Imageoptimization.ImageOptimizerProgress^ progressCallback 
)

Parameters

codecs
The Leadtools.Codecs.RasterCodecs object used internally in the optimization operation.

buffer
The original image buffer in memory as a System.Byte array. The image format in memory should be one of the following supported formats:

RasterImageFormat.Jpeg, Bits per pixel: 8 for grayscale, 24 for color.
RasterImageFormat.Jpeg411, Bits per pixel: 8 for grayscale, 24 for color.
RasterImageFormat.Jpeg422, Bits per pixel: 8 for grayscale, 24 for color.
RasterImageFormat.ExifJpeg411, Bits per pixel: 24 (color only).
RasterImageFormat.ExifJpeg422, Bits per pixel: 24 (color only).
RasterImageFormat.Gif, Bits per pixel: 1, 2, 3, 4, 5, 6, 7, and 8.
RasterImageFormat.Png, Bits per pixel: 1, 4, 8, 24, 32, 48, and 64.
RasterImageFormat.Bmp, Bits per pixel: 1, 4, 8, 16, 24, and 32.
RasterImageFormat.BmpRle, Bits per pixel: 4, and 8.

offset
The number of bytes to offset the pointer that points to the buffer parameter" so that the data will be read starting from the "Buffer + Offset" position.

length
The length of the image buffer, in bytes, starting from the offset byte.

options
The options used in the optimization process.

progressCallback
Optional callback function that provides information about the progress of the optimization process.

Return Value

A System.Byte array that contains the optimized image buffer in memory.

Remarks

For more information, refer to Image Optimization Using The ImageOptimizer Class.

Example

This example will optimize a Jpg image file then save it into a separate folder

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageOptimization 
Imports Leadtools.Support.Examples 
 
<TestMethod()> _ 
Public Sub TestJpegImageOptimizer() 
   ' Initialize the RasterCodecs class 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   ' The input and output location 
   Dim inputFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg") 
   Dim outputFolder As String = Path.Combine(LEAD_VARS.ImagesDir, "OptimizedImages") 
 
   ' Initialize a new Optimizer object 
   Dim optimizer As ImageOptimizer = New ImageOptimizer() 
 
   ' Optimization Options 
   Dim options As ImageOptimizerOptions = ImageOptimizerOptions.Default 
 
   ' Set custom optimization options 
   options.JpegQualityFactor = 255 
   options.JpegColorSpace = ImageOptimizerJpegColorSpace.JpegColorSpace422 
 
   ' Load the input file into a memory byte array 
   Dim orgBuffer() As Byte = File.ReadAllBytes(inputFileName) 
 
   ' Optimize this buffer 
   Dim optBuffer() As Byte = optimizer.OptimizeBuffer(codecs, orgBuffer, 0, orgBuffer.Length, options, AddressOf OptimizeBufferProgress) 
 
   ' Save this image into the output folder 
   ' Make sure the output folder exists 
   If (Not Directory.Exists(outputFolder)) Then 
      Directory.CreateDirectory(outputFolder) 
   End If 
 
   ' Get the name of the output file from the input file 
   Dim outputFileName As String = Path.Combine(outputFolder, Path.GetFileName(inputFileName)) 
 
   ' Save the optimized buffer to the output file 
   Using fs As FileStream = File.Create(outputFileName) 
      fs.Write(optBuffer, 0, optBuffer.Length) 
   End Using 
 
   ' Compare the original image size with the optimized size 
   Dim orgSize As Long = New FileInfo(inputFileName).Length 
   Dim optSize As Long = New FileInfo(outputFileName).Length 
   Dim percentage As Integer = CType(CType(optSize * 100.0 / orgSize, Double), Integer) 
 
   Dim message As String = String.Format( _ 
      "Original image size: {0} KB{1}Optimized image size: {2} KB{1}Percentage: {3}%", _ 
      orgSize / 1024, Environment.NewLine, optSize / 1024, _ 
      100 - percentage) 
   MessageBox.Show(message) 
 
   'shutdown the RasterCodecs class. 
End Sub 
 
Public Shared Function OptimizeBufferProgress(ByVal percent As Integer) As Boolean 
   'Console.WriteLine(String.Format("{0}%", percent)) 
   Return True 
End Function 
 
Public NotInheritable Class LEAD_VARS 
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageOptimization; 
 
public void TestJpegImageOptimizer( ) 
{ 
   // Initialize the RasterCodecs class 
   RasterCodecs codecs = new RasterCodecs(); 
   // The input and output location 
   string inputFileName = Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg"); 
   string outputFolder = Path.Combine(LEAD_VARS.ImagesDir, "OptimizedImages"); 
 
   // Initialize a new Optimizer object 
   ImageOptimizer optimizer = new ImageOptimizer(); 
 
   // Optimization Options 
   ImageOptimizerOptions options = ImageOptimizerOptions.Default; 
 
   // Set custom optimization options 
   options.JpegQualityFactor = 255; 
   options.JpegColorSpace = ImageOptimizerJpegColorSpace.JpegColorSpace422; 
 
   // Load the input file into a memory byte array 
   byte[] orgBuffer = File.ReadAllBytes(inputFileName); 
 
   // Optimize this buffer 
   byte[] optBuffer = optimizer.OptimizeBuffer(codecs, orgBuffer, 0, orgBuffer.Length, options, OptimizeBufferProgress); 
 
   // Save this image into the output folder 
   // Make sure the output folder exists 
   if(!Directory.Exists(outputFolder)) 
      Directory.CreateDirectory(outputFolder); 
 
   // Get the name of the output file from the input file 
   string outputFileName = Path.Combine(outputFolder, Path.GetFileName(inputFileName)); 
 
   // Save the optimized buffer to the output file 
   using(FileStream fs = File.Create(outputFileName)) 
      fs.Write(optBuffer, 0, optBuffer.Length); 
 
   // Compare the original image size with the optimized size 
   long orgSize = new FileInfo(inputFileName).Length; 
   long optSize = new FileInfo(outputFileName).Length; 
   int percentage = (int)((double)optSize * 100.0 / orgSize); 
 
   string message = string.Format( 
      "Original image size: {0} KB{1}Optimized image size: {2} KB{1}Percentage: {3}%", 
      orgSize / 1024, Environment.NewLine, optSize / 1024, 
      100 - percentage); 
   MessageBox.Show(message); 
 
   //shutdown the RasterCodecs class. 
} 
 
static bool OptimizeBufferProgress(int percent) 
{ 
   Console.WriteLine(string.Format("{0}%", percent)); 
   return true; 
} 
 
static class LEAD_VARS 
{ 
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}