Retrieves resized data, one line at a time.
public void ResizeBuffer(
int row,
int column,
byte[] buffer,
int bufferOffset,
int bytes
)
Public Overloads Sub ResizeBuffer( _
ByVal row As Integer, _
ByVal column As Integer, _
ByVal buffer() As Byte, _
ByVal bufferOffset As Integer, _
ByVal bytes As Integer _
)
public:
void ResizeBuffer(
int row,
int column,
array<byte>^ buffer,
int bufferOffset,
int bytes
)
row
The number of the row to retrieve. The first row is 0, and the last row is 1 less than the image Height.
column
The column offset within the row to retrieve. The first column offset is 0, and the last column offset is 1 less than the image Width.
buffer
The buffer to hold the image data that this method gets.
bufferOffset
The zero-based index into buffer where retrieving should start.
bytes
The number of bytes to retrieve. Consider the BitsPerPixel, and avoid specifying a number that goes past the end of the row.
You can use the BitsPerPixel property with integer math to calculate the number of bytes needed for a particular number of pixels. For example:
NumberOfBytes = Image.BitsPerPixel * (Image.Width * Image.Height + 7) / 8;
By using this low-level method to get any part of a row, you can write a procedure that accesses a single pixel or a rectangular area within the image.
This method accepts an offset parameter ( column) in pixels and a length ( bytes) in bytes. Therefore, you must consider the BitsPerPixel of the image when specifying these parameters. The following table describes the rules:
BitsPerPixel | Column Offset (in Pixels) | Bytes to Get |
---|---|---|
1 | Must be a multiple of 8 (such as 0,8, or 16). | Can be any number up to the end of the row. Consider that there are 8 pixels per byte. |
4 | Must be an even number (such as 0, 2, or 4). | Can be any number up to the end of the row. Consider that there are 2 pixels per byte. |
8 | Can be any column within the image. | Can be any number up to the end of the row. Consider that there is 1 pixel per byte. |
16 | Can be any column within the image. | Must be a multiple of 2 (such as 2, 4, or 6), because there are 2 bytes per pixel. |
24 | Can be any column within the image. | Must be a multiple of 3 (such as 3, 6, or 9), because there are 3 bytes per pixel. |
32 | Can be any column within the image. | Must be a multiple of 4 (such as 4, 8, or 12), because there are 4 bytes per pixel. |
48 | Can be any column within the image. | Must be a multiple of 6 (such as 6, 12, or 18), because there are 6 bytes per pixel. |
64 | Can be any column within the image. | Must be a multiple of 8 (such as 8, 16, or 24), because there are 8 bytes per pixel. |
Do not pass a value in bytes that goes past the end of the row. The process is faster when rows are retrieved sequentially, either top-down or bottom-up.
For more information, refer to Introduction to Image Processing With LEADTOOLS.
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