ResizeBuffer(byte[],int,int,int) Method (original) (raw)
Summary
Resizes a buffer to the new size specified with the Start method.
Syntax
Parameters
buffer
The buffer containing the original scanline to be resized.
bufferOffset
Zero-based index into the buffer.
row
Current row of the original bitmap.
bitsPerPixel
Bits per pixel, which is the same for the original and the resized bitmap.
Remarks buffer contains the buffer containing a line from the original image to be resized. Your code must allocate the buffer and copy the data into it before calling this method.
The same buffer holds the data before and after it is resized. Therefore, the buffer must be big enough to hold whichever is larger. (The original line is larger when reducing an image; the resulting line is larger when enlarging the image.)
Before calling this function, you must call the Start method.
When all lines have been processed, you must call the Stop method.
For more information, refer to Introduction to Image Processing With LEADTOOLS.
Example
using Leadtools;
using Leadtools.Codecs;
public void RasterBufferResizeExample()
{
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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);
}
}
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
Leadtools Assembly