C#
VB
C++
Provides support for resizing image data buffers.
public class RasterBufferResize
Public Class RasterBufferResize
public ref class RasterBufferResize
This example will load an image, resizes each line then saves the resized image back to disk.
using Leadtools;
using Leadtools.Codecs;
using LeadtoolsExamples.Common;
public void RasterBufferResizeExample()
{
string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
string destFileName = Path.Combine(ImagesPath.Path, "Image1_resized.bmp");
using (RasterCodecs codecs = new RasterCodecs())
{
codecs.ThrowExceptionsOnInvalidImages = true;
// Load the source image
using (RasterImage srcImage = codecs.Load(srcFileName))
{
int destWidth = srcImage.Width / 2;
int destHeight = srcImage.Height / 2;
// Create the destination image
using (RasterImage destImage = new RasterImage(
RasterMemoryFlags.Conventional,
destWidth,
destHeight,
srcImage.BitsPerPixel,
srcImage.Order,
srcImage.ViewPerspective,
srcImage.GetPalette(),
IntPtr.Zero,
0))
{
// allocate buffer for one scanline from source image
byte[] scanLine = new byte[srcImage.BytesPerLine];
// resize it
RasterBufferResize bufferResize = new RasterBufferResize();
// Initialize the resize process.
bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height);
srcImage.Access();
destImage.Access();
// Current destination row number
int destRow = 0;
for (int i = 0; i < srcImage.Height; i++)
{
// Get a scanline from the source image and resize it
srcImage.GetRow(i, scanLine, 0, srcImage.BytesPerLine);
bufferResize.ResizeBuffer(scanLine, 0, i, srcImage.BitsPerPixel);
// Output as many or as few rows as ResizeBuffer supplies
for (int j = 0; j < bufferResize.CopyRepetitions; j++)
{
destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3);
destRow++;
}
}
destImage.Release();
srcImage.Release();
bufferResize.Stop();
// Save the destination image
codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24);
}
}
}
}
Imports Leadtools
Imports Leadtools.Codecs
Public Sub RasterBufferResizeExample()
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.ThrowExceptionsOnInvalidImages = True
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_resized.bmp")
' Load the source image
Dim srcImage As RasterImage = codecs.Load(srcFileName)
Dim destWidth As Integer = srcImage.Width \ 2
Dim destHeight As Integer = srcImage.Height \ 2
' Create the destination image
Dim destImage As RasterImage = New RasterImage(
RasterMemoryFlags.Conventional,
destWidth, destHeight, srcImage.BitsPerPixel, srcImage.Order,
srcImage.ViewPerspective, srcImage.GetPalette(), IntPtr.Zero, 0)
' allocate buffer for one scanline from source image
Dim scanLine As Byte() = New Byte(srcImage.BytesPerLine - 1) {}
' resize it
Dim bufferResize As RasterBufferResize = New RasterBufferResize()
' Initialize the resize process.
bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height)
srcImage.Access()
destImage.Access()
' Current destination row number
Dim destRow As Integer = 0
Dim i As Integer = 0
Do While i < srcImage.Height
' Get a scanline from the source image and resize it
srcImage.GetRow(i, scanLine, 0, srcImage.BytesPerLine)
bufferResize.ResizeBuffer(scanLine, 0, i, srcImage.BitsPerPixel)
' Output as many or as few rows as ResizeBuffer supplies
Dim j As Integer = 0
Do While j < bufferResize.CopyRepetitions
destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3)
destRow += 1
j += 1
Loop
i += 1
Loop
destImage.Release()
srcImage.Release()
bufferResize.Stop()
' Save the destination image
codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24)
' Clean up
srcImage.Dispose()
destImage.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.Examples;
public void RasterBufferResizeExample(RasterImage srcImage, Stream destStream)
{
RasterCodecs codecs = new RasterCodecs();
codecs.ThrowExceptionsOnInvalidImages = true;
int destWidth = srcImage.Width / 2;
int destHeight = srcImage.Height / 2;
// Create the destination image
RasterImage destImage = new RasterImage(
RasterMemoryFlags.Conventional,
destWidth,
destHeight,
srcImage.BitsPerPixel,
srcImage.Order,
srcImage.ViewPerspective,
srcImage.GetPalette(),
null,
0);
// allocate buffer for one scanline from source image
byte[] scanLine = new byte[srcImage.BytesPerLine];
// resize it
RasterBufferResize bufferResize = new RasterBufferResize();
// Initialize the resize process.
bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height);
srcImage.Access();
destImage.Access();
// Current destination row number
int destRow = 0;
for (int i = 0; i < srcImage.Height; i++)
{
// Get a scanline from the source image and resize it
srcImage.GetRow(i, scanLine, 0, srcImage.BytesPerLine);
bufferResize.ResizeBuffer(scanLine, 0, i, srcImage.BitsPerPixel);
// Output as many or as few rows as ResizeBuffer supplies
for (int j = 0; j < bufferResize.CopyRepetitions; j++)
{
destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3);
destRow++;
}
}
destImage.Release();
srcImage.Release();
bufferResize.Stop();
// Save the destination image
codecs.Save(destImage, destStream, RasterImageFormat.Bmp, 24);
// Clean up
srcImage.Dispose();
destImage.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Public Sub RasterBufferResizeExample(ByVal srcImage As RasterImage, ByVal destStream As Stream)
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.ThrowExceptionsOnInvalidImages = True
Dim destWidth As Integer = srcImage.Width / 2
Dim destHeight As Integer = srcImage.Height / 2
' Create the destination image
Dim destImage As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, destWidth, destHeight, srcImage.BitsPerPixel, srcImage.Order, srcImage.ViewPerspective, srcImage.GetPalette(), Nothing, 0)
' allocate buffer for one scanline from source image
Dim scanLine As Byte() = New Byte(srcImage.BytesPerLine - 1) {}
' resize it
Dim bufferResize As RasterBufferResize = New RasterBufferResize()
' Initialize the resize process.
bufferResize.Start(srcImage.Width, srcImage.Height, destImage.Width, destImage.Height)
srcImage.Access()
destImage.Access()
' Current destination row number
Dim destRow As Integer = 0
Dim i As Integer = 0
Do While i < srcImage.Height
' Get a scanline from the source image and resize it
srcImage.GetRow(i, scanLine, 0, srcImage.BytesPerLine)
bufferResize.ResizeBuffer(scanLine, 0, i, srcImage.BitsPerPixel)
' Output as many or as few rows as ResizeBuffer supplies
Dim j As Integer = 0
Do While j < bufferResize.CopyRepetitions
destImage.SetRow(destRow, scanLine, 0, bufferResize.LineWidth * 3)
destRow += 1
j += 1
Loop
i += 1
Loop
destImage.Release()
srcImage.Release()
bufferResize.Stop()
' Save the destination image
codecs.Save(destImage, destStream, RasterImageFormat.Bmp, 24)
' Clean up
srcImage.Dispose()
destImage.Dispose()
End Sub
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