Leadtools.Codecs Namespace > RasterCodecs Class > LoadAsync Method : LoadAsync(ILeadStream,Int32,Int32,Int32,RasterSizeFlags,CodecsLoadByteOrder,Int32,Int32) Method |
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 have no order.
public IAsyncOperation<RasterImage> LoadAsync( ILeadStream stream, int width, int height, int bitsPerPixel, RasterSizeFlags flags, CodecsLoadByteOrder order, int firstPage, int lastPage )
'Declaration Public Overloads Function LoadAsync( _ ByVal stream As ILeadStream, _ ByVal width As Integer, _ ByVal height As Integer, _ ByVal bitsPerPixel As Integer, _ ByVal flags As RasterSizeFlags, _ ByVal order As CodecsLoadByteOrder, _ ByVal firstPage As Integer, _ ByVal lastPage As Integer _ ) As IAsyncOperation(Of RasterImage)
'Usage Dim instance As RasterCodecs Dim stream As ILeadStream Dim width As Integer Dim height As Integer Dim bitsPerPixel As Integer Dim flags As RasterSizeFlags Dim order As CodecsLoadByteOrder Dim firstPage As Integer Dim lastPage As Integer Dim value As IAsyncOperation(Of RasterImage) value = instance.LoadAsync(stream, width, height, bitsPerPixel, flags, order, firstPage, lastPage)
public IAsyncOperation<RasterImage> LoadAsync( ILeadStream stream, int width, int height, int bitsPerPixel, RasterSizeFlags flags, CodecsLoadByteOrder order, int firstPage, int lastPage )
function Leadtools.Codecs.RasterCodecs.LoadAsync(ILeadStream,Int32,Int32,Int32,RasterSizeFlags,CodecsLoadByteOrder,Int32,Int32)( stream , width , height , bitsPerPixel , flags , order , firstPage , lastPage )
public: IAsyncOperation<RasterImage^>^ LoadAsync( ILeadStream^ stream, int width, int height, int bitsPerPixel, RasterSizeFlags flags, CodecsLoadByteOrder order, int firstPage, int lastPage )
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 have no order.
LEADTOOLS will attempt to load corrupted files so you can see at least a portion of the image. For such images, the load methods succeed, but the LoadStatus will return an error code.
Valid values are for the flags parameter are:
Value | Meaning |
---|---|
Leadtools.RasterSizeFlagsRasterSizeFlags.None | Normal resizing |
Leadtools.RasterSizeFlagsRasterSizeFlags.Resample | Linear interpolation resizing |
Leadtools.RasterSizeFlagsRasterSizeFlags.Bicubic | Bicubic interpolation resizing |
Leadtools.RasterSizeFlagsRasterSizeFlags.FavorBlack | Not supported |
Valid values are for the bitsPerPixel parameter 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. |
Valid values are for the order parameter 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. |
Use the CodecsLoadOptions class to set up other load option parameters before calling this method.
Support for 12 and 16-bit grayscale images is only available in the Document/Medical Imaging editions.
For supported formats, refer to Summary of All Supported Image File Formats.
LEADTOOLS loads all PDF files as Raster PDF uncompressed RasterImageFormat.RasPdf, regardless of the compression and color space used when saving the file.
The RasterCodecs class supports loading image files asynchronously using the LoadAsync methods. When calling any of these methods, the caller thread will not be blocked and the method will return instantly with an instance of Leadtools.RasterImage that is in a loading status (RasterImage.IsLoading set to true). You should not use the other properties of this object while the object is in loading status.
When the RasterCodecs object finishes loading the image, the various properties of the Leadtools.RasterImage will be populated with the image information and data and the RasterImage.IsLoading property will be set to false.
Do not poll the RasterImage.IsLoading property to determine whether the image has finished loading. Instead, subscribe to the IAsyncOperation.Completed event to get notification when the LoadAsync(String,LeadRect,Int32,CodecsLoadByteOrder,Int32,Int32,Object) operation has completed and whether any errors occurred.
When this method completes, it returns the image as a Leadtools.RasterImage.
RasterCodecsExamples.prototype.LoadResize2Example = function ( ) { Tools.SetLicense ( ) ; with (Leadtools) { with (Leadtools.Codecs) { var codecs = new RasterCodecs(); var image; var srcFileName = "Assets\\Image1.cmp"; var destFileName = "LoadResize2.bmp"; // We want to load the image as 320/200 var width = 320; var height = 200; var loadFile; return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFilex) { loadFile = loadFilex; return codecs.getInformationAsync(LeadStreamFactory.create(loadFile), true, 1) }) .then(function (info) { // Get the page number to load var pageNumber = info.totalPages; // Load the last page in the specified size return codecs.loadAsync(LeadStreamFactory.create(loadFile), width, height, 0, RasterSizeFlags.resample, CodecsLoadByteOrder.bgrOrGray, pageNumber, pageNumber) }) .then(function (img) { image = img; console.assert(image.width == width, "image.width == width"); console.assert(image.height == height, "image.height == height"); // Save this image back to disk return Tools.AppLocalFolder().createFileAsync(destFileName) }) .then(function (saveFile) { return codecs.saveAsync(image, LeadStreamFactory.create(saveFile), RasterImageFormat.bmp, 24) }) .then(function () { image.close(); // Clean up codecs.close(); }); } } }
using Leadtools; using Leadtools.Codecs; using Leadtools.ImageProcessing; using Leadtools.ImageProcessing.Color; public async Task LoadResize2Example() { RasterCodecs codecs = new RasterCodecs(); string srcFileName = @"Assets\Image1.cmp"; string destFileName = @"LoadResize2.bmp"; StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName); CodecsImageInfo info = await codecs.GetInformationAsync(LeadStreamFactory.Create(loadFile), true, 1); // Get the page number to load int pageNumber = info.TotalPages; // We want to load the image as 320/200 int width = 320; int height = 200; // Load the last page in the specified size RasterImage image = await codecs.LoadAsync( LeadStreamFactory.Create(loadFile), width, height, 0, RasterSizeFlags.Resample, CodecsLoadByteOrder.BgrOrGray, pageNumber, pageNumber); Assert.IsTrue(image.Width == width); Assert.IsTrue(image.Height == height); // Save this image back to disk StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName); await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Bmp, 24); image.Dispose(); // Clean up codecs.Dispose(); }