ReadFrames(RasterCodecs,Stream,List<Int32>,Int32,CodecsLoadByteOrder) Method

C#
Visual Basic
Objective-C
Java
C++

public List<CompositeJpxImages> ReadFrames( 
   RasterCodecs codecs,
   Stream stream,
   List<int> frames,
   int bitsPerPixel,
   CodecsLoadByteOrder order
)

'Declaration
 
Public Overloads Function ReadFrames( _
   ByVal codecs As RasterCodecs, _
   ByVal stream As Stream, _
   ByVal frames As List(Of Integer), _
   ByVal bitsPerPixel As Integer, _
   ByVal order As CodecsLoadByteOrder _
) As List(Of CompositeJpxImages)

'Usage
 
Dim instance As Jpeg2000Engine
Dim codecs As RasterCodecs
Dim stream As Stream
Dim frames As List(Of Integer)
Dim bitsPerPixel As Integer
Dim order As CodecsLoadByteOrder
Dim value As List(Of CompositeJpxImages)
 
value = instance.ReadFrames(codecs, stream, frames, bitsPerPixel, order)

public:
List<CompositeJpxImages^>^ ReadFrames( 
   RasterCodecs^ codecs,
   Stream^ stream,
   List<int>^ frames,
   int bitsPerPixel,
   CodecsLoadByteOrder order
)

Parameters

codecs

The Leadtools.Codecs.RasterCodecs object.

stream

A System.IO.Stream containing the image data being loaded.

frames

Frame indices. A list of integers specifying the indices of the frames to be loaded from the stream.

bitsPerPixel

Resulting image pixel depth. If this value is zero [0], the image will have the original file's pixel depth (the image will not be converted).

order

Color order for 16-, 24-, 32-, 48-, and 64-bit images. If the resulting image is less than 16 bits per pixel, this will have no effect since palletized images do not use color order. Valid values are as follows:

Value	Meaning
CodecsLoadByteOrder.Rgb	Red, green, and blue color order in memory
CodecsLoadByteOrder.Bgr	Blue, green, and red color order in memory
CodecsLoadByteOrder.Gray	12- or 16-bit grayscale image. 12- and 16-bit grayscale images are supported only in the Document/Medical Imaging editions.
CodecsLoadByteOrder.RgbOrGray	Load the image as red, green, blue OR as a 12- or 16-bit grayscale image. 12- and 16-bit grayscale images are supported only in the Document/Medical Imaging editions.
CodecsLoadByteOrder.BgrOrGray	Load the image as blue, green, red OR as a 12- or 16-bit grayscale image. 12- and 16-bit grayscale images are supported only in the Document/Medical Imaging editions.
CodecsLoadByteOrder.Romm	ROMM order. ROMM only supports 24- and 48-bit images.
CodecsLoadByteOrder.BgrOrGrayOrRomm	Load the image as red, green, blue OR as a 12- or 16-bit grayscale image OR as ROMM. 12- and 16-bit grayscale images are supported only in the Document/Medical Imaging editions. ROMM only supports 24- and 48-bit color images.

Return Value

The CompositeJpxImages list that this method loads.

All engine boxes will be reset.

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

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Jpeg2000

<TestMethod()> _
Public Sub ReadFramesStreamExample()
   Dim fs As FileStream = File.OpenRead(Path.Combine(LEAD_VARS.ImagesDir, "image1.jpx"))
   ' Load a JPEG 2000 image
   Dim engine As New Jpeg2000Engine()
   Dim fileInfo As Jpeg2000FileInformation = engine.GetFileInformation(fs)
   If (fileInfo.Frame.GetLength(0) < 2) Then
      Return
   End If

   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   Dim frames As New List(Of Integer)
   frames.Add(1)
   Dim images As List(Of CompositeJpxImages) = engine.ReadFrames(codecs, fs, frames, 0, CodecsLoadByteOrder.BgrOrGray)

   '  Clean up
   fs.Close()
   Dim _image As CompositeJpxImages
   For Each _image In images
      _image.ColorImage.Dispose()
      _image.OpacityImage.Dispose()
      _image.PreOpacityImage.Dispose()
   Next _image
   codecs.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;
using Leadtools.Jpeg2000;

[TestMethod]
public void ReadFramesStreamExample()
{
   FileStream fs = File.OpenRead(Path.Combine(LEAD_VARS.ImagesDir, "image1.jpx"));
   // Load a JPEG 2000 image
   Jpeg2000Engine engine = new Jpeg2000Engine();
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   List<int> frames = new List<int>();
   frames.Add(1);
   List<CompositeJpxImages> images = engine.ReadFrames(codecs, fs, frames, 0, CodecsLoadByteOrder.BgrOrGray);
   // Clean up
   fs.Close();
   foreach (CompositeJpxImages image in images)
   {
      if (image.ColorImage != null)
         image.ColorImage.Dispose();

      if (image.OpacityImage != null)
         image.OpacityImage.Dispose();

      if (image.PreOpacityImage != null)
         image.PreOpacityImage.Dispose();
   }
   codecs.Dispose();
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms

Reference

Jpeg2000Engine Class
Jpeg2000Engine Members
Overload List
AppendFrames
Load
LoadComposite
ReadFrames(RasterCodecs,String, List, Int32, CodecsLoadByteOrder)
Save
SaveComposite
Compression Using LEAD and JPEG Formats
File Formats - JPEG And LEAD Compressed
Bitmaps In Memory And In Files
JPEG2000 File Comments
JPEG And LEAD File Comments
Programming with JPEG 2000 Features
JPEG 2000 Boxes