public static class RasterDefaults
Public MustInherit NotInheritable Class RasterDefaults
@interface LTRasterDefaults : NSObject
public class RasterDefaults
public ref class RasterDefaults abstract sealed
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.
Use GetGlobalMemoryThresholds and SetGlobalMemoryThresholds to modify the conventional memory restrictions used when allocating new RasterImage objects.
using Leadtools;
using Leadtools.Codecs;
using LeadtoolsExamples.Common;
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);
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("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);
}
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
c#[Silverlight C# Example]
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);
}
vb[Silverlight VB Example]
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
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