Leadtools.Codecs Namespace > RasterCodecs Class > StartFeedLoad Method : StartFeedLoad(Int32,CodecsLoadByteOrder,Int32,Int32) Method |
Resulting image pixel depth. Valid values are:
Value | Meaning |
---|---|
0 | Keep the original file's pixel depth (Do not convert). |
1 to 8 | The specified bits per pixel in the resulting image. |
12 | 12 bits per pixel in the resulting image. |
16 | 16 bits per pixel in the resulting image. |
24 | 24 bits per pixel in the resulting image. |
32 | 32 bits per pixel in the resulting image. |
48 | 48 bits per pixel in the resulting image. |
64 | 64 bits per pixel in the resulting image. |
The desired color order. Possible values are:
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 only supported 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 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 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 in the Document/Medical Imaging editions only. ROMM only supports 24 and 48-bit color images. |
public void StartFeedLoad( int bitsPerPixel, CodecsLoadByteOrder order, int firstPage, int lastPage )
'Declaration Public Overloads Sub StartFeedLoad( _ ByVal bitsPerPixel As Integer, _ ByVal order As CodecsLoadByteOrder, _ ByVal firstPage As Integer, _ ByVal lastPage As Integer _ )
'Usage Dim instance As RasterCodecs Dim bitsPerPixel As Integer Dim order As CodecsLoadByteOrder Dim firstPage As Integer Dim lastPage As Integer instance.StartFeedLoad(bitsPerPixel, order, firstPage, lastPage)
public void StartFeedLoad( int bitsPerPixel, CodecsLoadByteOrder order, int firstPage, int lastPage )
-(BOOL)startFeedLoad:(unsigned int)bitsPerPixel order:(LTCodecsLoadByteOrder)order firstPage:(unsigned int)firstPage lastPage:(int)lastPage error:(NSError**)outError;
public FeedCallbackThunk startFeedLoad(int bitsPerPixel, CodecsLoadByteOrder order, int firstPage, int lastPage)
function Leadtools.Codecs.RasterCodecs.StartFeedLoad(Int32,CodecsLoadByteOrder,Int32,Int32)( bitsPerPixel , order , firstPage , lastPage )
public: void StartFeedLoad( int bitsPerPixel, CodecsLoadByteOrder order, int firstPage, int lastPage )
Resulting image pixel depth. Valid values are:
Value | Meaning |
---|---|
0 | Keep the original file's pixel depth (Do not convert). |
1 to 8 | The specified bits per pixel in the resulting image. |
12 | 12 bits per pixel in the resulting image. |
16 | 16 bits per pixel in the resulting image. |
24 | 24 bits per pixel in the resulting image. |
32 | 32 bits per pixel in the resulting image. |
48 | 48 bits per pixel in the resulting image. |
64 | 64 bits per pixel in the resulting image. |
The desired color order. Possible values are:
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 only supported 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 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 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 in the Document/Medical Imaging editions only. ROMM only supports 24 and 48-bit color images. |
You must call the FeedLoad(Byte[],Int32,Int32) method to supply buffered data, and you must call StopFeedLoad when the loading is complete.
This file-load process is useful when receiving transmitted images, such as those on the Internet. It works the same way as the Load(String) or LoadAsync(String,LeadRect,Int32,CodecsLoadByteOrder,Int32,Int32,Object) methods, except that your code supplies the image data. The file-load process works as follows:
Whenever it has enough data to do so, the file-load process behaves the same as in the Load(String) or LoadAsync(String,LeadRect,Int32,CodecsLoadByteOrder,Int32,Int32,Object) methods. It allocates and begins loading the image. It calls your LoadImage event handler, if one is specified, whenever it has enough data in its input buffer.
The file-load process updates information in the Leadtools.RasterImage when it has received enough information to do so. The file-load process will make the first call to your event handler whenever this information is available.
CodecsLoadByteOrder.Gray is only valid for 12 and 16-bit grayscale images. Support for 12 and 16-bit grayscale images is only available in the Document/Medical Imaging editions.
This method cannot be used in combination with StartRedirecting.
Imports Leadtools Imports Leadtools.Codecs Imports Leadtools.ImageProcessing Imports Leadtools.ImageProcessing.Color Imports Leadtools.Drawing Public Sub FeedLoadMultiExample() Dim codecs As New RasterCodecs() Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif") Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "FeedLoadMulti.tif") ' Load pages 2 through 5 from the file by reading chunks from the stream codecs.StartFeedLoad(0, CodecsLoadByteOrder.BgrOrGray, 2, 5) Dim fs As FileStream = File.OpenRead(srcFileName) Try Const bufferSize As Integer = 1024 Dim buffer(bufferSize - 1) As Byte Dim read As Integer Do System.Windows.Forms.Application.DoEvents() read = fs.Read(buffer, 0, bufferSize) Console.WriteLine("Feeding {0} bytes", read) If (read > 0) Then codecs.FeedLoad(buffer, 0, read) End If Loop While read > 0 AndAlso Not codecs.IsFeedLoadDone Finally fs.Close() End Try Dim image As RasterImage = codecs.StopFeedLoad() Console.WriteLine("{0} pages loaded", image.PageCount) ' Save the image to disk codecs.Save(image, destFileName, RasterImageFormat.Tif, 1, 1, -1, 1, CodecsSavePageMode.Overwrite) image.Dispose() ' Clean up 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.ImageProcessing; using Leadtools.ImageProcessing.Color; public void FeedLoadMultiExample() { RasterCodecs codecs = new RasterCodecs(); string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif"); string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "FeedLoadMulti.tif"); // Load pages 2 through 5 from the file by reading chunks from the stream codecs.StartFeedLoad(0, CodecsLoadByteOrder.BgrOrGray, 2, 5); using (FileStream fs = File.OpenRead(srcFileName)) { const int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; int read; do { System.Windows.Forms.Application.DoEvents(); read = fs.Read(buffer, 0, bufferSize); Console.WriteLine("Feeding {0} bytes", read); if (read > 0) codecs.FeedLoad(buffer, 0, read); } while (read > 0 && !codecs.IsFeedLoadDone); } RasterImage image = codecs.StopFeedLoad(); Console.WriteLine("{0} pages loaded", image.PageCount); // Save the image to disk codecs.Save(image, destFileName, RasterImageFormat.Tif, 1, 1, -1, 1, CodecsSavePageMode.Overwrite); image.Dispose(); // Clean up codecs.Dispose(); } static class LEAD_VARS { public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; }
RasterCodecsExamples.prototype.FeedLoadMultiExample = function ( ) { Tools.SetLicense ( ) ; with ( Leadtools ) { with ( Leadtools.Codecs ) { var codecs = new RasterCodecs(); var srcFileName = "Assets\\Eye.gif"; var destFileName = "FeedLoadMulti.tif"; var image ; // Load pages 2 through 5 from the file by reading chunks from the stream codecs.startFeedLoad(0, CodecsLoadByteOrder.bgrOrGray, 2, 5); return Tools.AppInstallFolder().getFileAsync(srcFileName).then ( function ( loadFile ) { return loadFile.openAsync(Windows.Storage.FileAccessMode.read)}) .then ( function ( randomAccessStream ) { var bufferSize = 1024; var buffer = new Windows.Storage.Streams.Buffer(bufferSize); return ReadStreamAsync (randomAccessStream, buffer, bufferSize, codecs ) }) .then ( function ( ) { image = codecs.stopFeedLoad(); console.info(image.pageCount, " pages loaded"); // Save the image to disk return Tools.AppLocalFolder().createFileAsync(destFileName)}) .then ( function ( saveFile ) { return codecs.saveAsync(image, LeadStreamFactory.create(saveFile), RasterImageFormat.tif, 1, 1, -1, 1, CodecsSavePageMode.overwrite)}) .then ( function ( ) { image.close(); // Clean up codecs.close(); }); } } } function ReadStreamAsync (randomAccessStream, buffer, bufferSize, codecs ) { var read; return randomAccessStream.readAsync(buffer, bufferSize, Windows.Storage.Streams.InputStreamOptions.none).then(function (readBuffer) { console.info("Feeding " + readBuffer.length + " bytes"); if (readBuffer.length > 0) codecs.feedLoad(ToArray(readBuffer), 0, readBuffer.length); if (readBuffer.length > 0 && !codecs.isFeedLoadDone) return ReadStreamAsync(randomAccessStream, buffer, bufferSize, codecs) }); } function ToArray ( buffer ) { uselessReader = Windows.Storage.Streams.DataReader.fromBuffer(buffer); var array = new Uint8Array(buffer.length); uselessReader.readBytes( array ); uselessReader.close ( ); return array; }
using Leadtools; using Leadtools.Codecs; using Leadtools.ImageProcessing; using Leadtools.ImageProcessing.Color; public async Task FeedLoadMultiExample() { RasterCodecs codecs = new RasterCodecs(); string srcFileName = @"Assets\Eye.gif"; string destFileName = @"FeedLoadMulti.tif"; // Load pages 2 through 5 from the file by reading chunks from the stream codecs.StartFeedLoad(0, CodecsLoadByteOrder.BgrOrGray, 2, 5); StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName); using (IRandomAccessStream randomAccessStream = await loadFile.OpenAsync(FileAccessMode.Read)) { using (Stream memStream = randomAccessStream.AsStream()) { const int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; int read; do { read = memStream.Read(buffer, 0, bufferSize); Debug.WriteLine("Feeding {0} bytes", read); if (read > 0) codecs.FeedLoad(buffer, 0, read); } while (read > 0 && !codecs.IsFeedLoadDone); } } RasterImage image = codecs.StopFeedLoad(); Debug.WriteLine("{0} pages loaded", image.PageCount); // Save the image to disk StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName); await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Tif, 1, 1, -1, 1, CodecsSavePageMode.Overwrite); image.Dispose(); // Clean up codecs.Dispose(); }