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LEADTOOLS (Leadtools assembly)
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RasterDefaults Class








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Leadtools Namespace : RasterDefaults Class
Specifies the default extra values used when creating RasterImage objects.
Object Model
Syntax
public static class RasterDefaults 
'Declaration
 

Public MustInherit NotInheritable Class RasterDefaults 
'Usage
 

Dim instance As RasterDefaults
public sealed static class RasterDefaults 
@interface LTRasterDefaults : NSObject
public class RasterDefaults
function Leadtools.RasterDefaults()
public ref class RasterDefaults abstract sealed
Remarks

You can use the RasterDefaults class to specify extra attributes used when creating a RasterImage object.

For example, you can use XResolution and YResolution to set the physical resolution (DPI) of all the RasterImage objects created afterwards.

You can use DitheringMethod to specify the default dithering method to use when converting an image from 64, 48, 32, 24, or 16 bits per pixel to 8 bits per pixel or fewer.

MemoryFlags and MemoryThreshold controls how newly created images use the system memory. The TemporaryDirectory controls where disk-based images are stored.

Example
Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing

      
Public Sub RasterDefaultsExample()
   ' Set the limit for RasterImage object allocations
   Dim threshold As RasterMemoryThreshold = RasterDefaults.MemoryThreshold
   threshold.MaximumGlobalRasterImageMemory = 20 * 1000 * 1024
   RasterDefaults.MemoryThreshold = threshold
   ShowValues()

   ' Create a raster image with current DPI
   Dim image1 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, IntPtr.Zero, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution)

   ' Change the resolution
   Dim xOldResolution As Integer = RasterDefaults.XResolution
   Dim yOldResolution As Integer = RasterDefaults.YResolution
   Dim xNewResolution As Integer = 196
   Dim yNewResolution As Integer = 196
   RasterDefaults.XResolution = xNewResolution
   RasterDefaults.YResolution = yNewResolution
   ShowValues()

   ' Create another raster image
   ' Create a raster image with current DPI
   Dim image2 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, IntPtr.Zero, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution)
   Debug.Assert(image2.XResolution = xNewResolution)
   Debug.Assert(image2.YResolution = yNewResolution)

   ' Reset old values
   RasterDefaults.XResolution = xOldResolution
   RasterDefaults.YResolution = yOldResolution

   image1.Dispose()
   image2.Dispose()
End Sub

Private Sub ShowValues()
   Console.WriteLine("Current defaults:")
   Console.WriteLine("MaximumThreadCount: {0}", RasterDefaults.MaximumThreadCount)
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution)
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution)
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod)
   Console.WriteLine("MemoryFlags: {0}", RasterDefaults.MemoryFlags)

   Dim threshold As RasterMemoryThreshold = RasterDefaults.MemoryThreshold
   Console.WriteLine("MemoryThreshold.TiledThreshold: {0}", threshold.TiledThreshold)
   Console.WriteLine("MemoryThreshold.MaximumConventionalSize: {0}", threshold.MaximumConventionalSize)
   Console.WriteLine("MemoryThreshold.TileSize: {0}", threshold.TileSize)
   Console.WriteLine("MemoryThreshold.ConventionalTiles: {0}", threshold.ConventionalTiles)
   Console.WriteLine("MemoryThreshold.ConventionalBuffers: {0}", threshold.ConventionalBuffers)
   Console.WriteLine("MemoryThreshold.MaximumGlobalRasterImageMemory: {0}", threshold.MaximumGlobalRasterImageMemory)

   Console.WriteLine("TemporaryDirectory: {0}", RasterDefaults.TemporaryDirectory)
End Sub
using Leadtools;
using Leadtools.Codecs;

      
public void RasterDefaultsExample()
{
   // Set the limit for RasterImage object allocations
   RasterMemoryThreshold threshold = RasterDefaults.MemoryThreshold;
   threshold.MaximumGlobalRasterImageMemory = 20 * 1000 * 1024;
   RasterDefaults.MemoryThreshold = threshold;
   ShowValues();

   // Create a raster image with current DPI
   RasterImage image1 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      IntPtr.Zero,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution);

   // Change the resolution
   int xOldResolution = RasterDefaults.XResolution;
   int yOldResolution = RasterDefaults.YResolution;
   int xNewResolution = 196;
   int yNewResolution = 196;
   RasterDefaults.XResolution = xNewResolution;
   RasterDefaults.YResolution = yNewResolution;
   ShowValues();

   // Create another raster image
   // Create a raster image with current DPI
   RasterImage image2 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      IntPtr.Zero,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution);
   Assert.IsTrue(image2.XResolution == xNewResolution);
   Assert.IsTrue(image2.YResolution == yNewResolution);

   // Reset old values
   RasterDefaults.XResolution = xOldResolution;
   RasterDefaults.YResolution = yOldResolution;

   image1.Dispose();
   image2.Dispose();
}

void ShowValues()
{
   Console.WriteLine("Current defaults:");
   Console.WriteLine("MaximumThreadCount: {0}", RasterDefaults.MaximumThreadCount);
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution);
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution);
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod);
   Console.WriteLine("MemoryFlags: {0}", RasterDefaults.MemoryFlags);

   RasterMemoryThreshold threshold = RasterDefaults.MemoryThreshold;
   Console.WriteLine("MemoryThreshold.TiledThreshold: {0}", threshold.TiledThreshold);
   Console.WriteLine("MemoryThreshold.MaximumConventionalSize: {0}", threshold.MaximumConventionalSize);
   Console.WriteLine("MemoryThreshold.TileSize: {0}", threshold.TileSize);
   Console.WriteLine("MemoryThreshold.ConventionalTiles: {0}", threshold.ConventionalTiles);
   Console.WriteLine("MemoryThreshold.ConventionalBuffers: {0}", threshold.ConventionalBuffers);
   Console.WriteLine("MemoryThreshold.MaximumGlobalRasterImageMemory: {0}", threshold.MaximumGlobalRasterImageMemory);

   Console.WriteLine("TemporaryDirectory: {0}", RasterDefaults.TemporaryDirectory);
}
function RasterDefaultsExample()
{
   with ( Leadtools ) 
   {
      Tools.SetLicense();
      ShowValues();

      // Create a raster image with current DPI
      var image1 = new RasterImage(
         RasterMemoryFlags.conventional,
         100,
         100,
         24,
         RasterByteOrder.bgr,
         RasterViewPerspective.topLeft,
         null);

      console.info ("Resolution of created image is " + image1.XResolution + " by " + image1.YResolution + " DPI");

      // Change the resolution
      var xOldResolution = RasterDefaults.xresolution;
      var yOldResolution = RasterDefaults.yresolution;
      var xNewResolution = 196;
      var yNewResolution = 196;
      RasterDefaults.xresolution = xNewResolution;
      RasterDefaults.yresolution = yNewResolution;
      ShowValues();

      // Create another raster image
      // Create a raster image with current DPI
      var image2 = new RasterImage(
         RasterMemoryFlags.conventional,
         100,
         100,
         24,
         RasterByteOrder.bgr,
         RasterViewPerspective.topLeft,
         null);
      console.info("Resolution of created image is " + image2.xresolution + " by " + image2.yresolution + " DPI" );
      console.assert (image2.xresolution == xNewResolution, "image2.XResolution == xNewResolution");
      console.assert (image2.yresolution == yNewResolution, "image2.YResolution == yNewResolution");

      // Reset old values
      RasterDefaults.xresolution = xOldResolution;
      RasterDefaults.yresolution = yOldResolution;

      image1.close();
      image2.close();
   }
}

function ShowValues()
{
   with ( Leadtools ) 
   {
      console.info("Current defaults:");
   
      console.info("XResolution: ", RasterDefaults.xresolution);
      console.info("YResolution: ", RasterDefaults.yresolution);
      console.info("DitheringMethod: ", RasterDefaults.ditheringMethod);
      console.info("MemoryFlags: ", RasterDefaults.memoryFlags);

      var threshold = RasterDefaults.memoryThreshold;
      console.info("MemoryThreshold.TiledThreshold: ", threshold.tiledThreshold);
      console.info("MemoryThreshold.MaximumConventionalSize: ", threshold.maximumConventionalSize);
      console.info("MemoryThreshold.TileSize: ", threshold.tileSize);
      console.info("MemoryThreshold.ConventionalTiles: ", threshold.conventionalTiles);
      console.info("MemoryThreshold.ConventionalBuffers: ", threshold.conventionalBuffers);

      console.info("TemporaryDirectory: ", RasterDefaults.temporaryDirectory);
   }
}
using Leadtools;
using Leadtools.Codecs;

      
public void RasterDefaultsExample()
{
   ShowValues();
   // Create a raster image with current DPI
   RasterImage image1 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null);
   Debug.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution);

   // Change the resolution
   int xOldResolution = RasterDefaults.XResolution;
   int yOldResolution = RasterDefaults.YResolution;
   int xNewResolution = 196;
   int yNewResolution = 196;
   RasterDefaults.XResolution = xNewResolution;
   RasterDefaults.YResolution = yNewResolution;
   ShowValues();

   // Create another raster image
   // Create a raster image with current DPI
   RasterImage image2 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null);
   Debug.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution);
   Assert.IsTrue(image2.XResolution == xNewResolution);
   Assert.IsTrue(image2.YResolution == yNewResolution);

   // Reset old values
   RasterDefaults.XResolution = xOldResolution;
   RasterDefaults.YResolution = yOldResolution;

   image1.Dispose();
   image2.Dispose();
}

void ShowValues()
{
   Debug.WriteLine("Current defaults:");
   //Debug.WriteLine("MaximumThreadCount: {0}", RasterDefaults.MaximumThreadCount);
   Debug.WriteLine("XResolution: {0}", RasterDefaults.XResolution);
   Debug.WriteLine("YResolution: {0}", RasterDefaults.YResolution);
   Debug.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod);
   Debug.WriteLine("MemoryFlags: {0}", RasterDefaults.MemoryFlags);

   RasterMemoryThreshold threshold = RasterDefaults.MemoryThreshold;
   Debug.WriteLine("MemoryThreshold.TiledThreshold: {0}", threshold.TiledThreshold);
   Debug.WriteLine("MemoryThreshold.MaximumConventionalSize: {0}", threshold.MaximumConventionalSize);
   Debug.WriteLine("MemoryThreshold.TileSize: {0}", threshold.TileSize);
   Debug.WriteLine("MemoryThreshold.ConventionalTiles: {0}", threshold.ConventionalTiles);
   Debug.WriteLine("MemoryThreshold.ConventionalBuffers: {0}", threshold.ConventionalBuffers);

   Debug.WriteLine("TemporaryDirectory: {0}", RasterDefaults.TemporaryDirectory);
}
using Leadtools;

public void RasterDefaultsExample()
{
   ShowValues();

   // Create a raster image with current DPI
   RasterImage image1 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      null,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution);

   // Change the resolution
   int xOldResolution = RasterDefaults.XResolution;
   int yOldResolution = RasterDefaults.YResolution;
   int xNewResolution = 196;
   int yNewResolution = 196;
   RasterDefaults.XResolution = xNewResolution;
   RasterDefaults.YResolution = yNewResolution;
   ShowValues();

   // Create another raster image
   // Create a raster image with current DPI
   RasterImage image2 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      null,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution);
   Debug.Assert(image2.XResolution == xNewResolution);
   Debug.Assert(image2.YResolution == yNewResolution);

   // Reset old values
   RasterDefaults.XResolution = xOldResolution;
   RasterDefaults.YResolution = yOldResolution;

   image1.Dispose();
   image2.Dispose();
}

void ShowValues()
{
   Console.WriteLine("Current defaults:");
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution);
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution);
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod);
}
Imports Leadtools

      
Public Sub RasterDefaultsExample()
   ShowValues()
   ' Create a raster image with current DPI
   Dim image1 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution)

   ' Change the resolution
   Dim xOldResolution As Integer = RasterDefaults.XResolution
   Dim yOldResolution As Integer = RasterDefaults.YResolution
   Dim xNewResolution As Integer = 196
   Dim yNewResolution As Integer = 196
   RasterDefaults.XResolution = xNewResolution
   RasterDefaults.YResolution = yNewResolution
   ShowValues()

   ' Create another raster image
   ' Create a raster image with current DPI
   Dim image2 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution)
   Debug.Assert(image2.XResolution = xNewResolution)
   Debug.Assert(image2.YResolution = yNewResolution)

   ' Reset old values
   RasterDefaults.XResolution = xOldResolution
   RasterDefaults.YResolution = yOldResolution

   image1.Dispose()
   image2.Dispose()
End Sub

Private Sub ShowValues()
   Console.WriteLine("Current defaults:")
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution)
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution)
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod)
End Sub
Requirements

Target Platforms

See Also

Reference

RasterDefaults Members
Leadtools Namespace

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