ImageGear v26.5 - Updated
ImageGear.Core Assembly / ImageGear.Core Namespace / ImGearDIB Class / GetRaster Method
Number of requested row.




In This Topic
    GetRaster Method
    In This Topic
    Returns reference to raw raster store. Should be used to gain direct access to raster pixels.
    Syntax
    'Declaration
     
    Public MustOverride Function GetRaster( _
       ByVal row As Integer _
    ) As ImGearArrayRef
    'Usage
     
    Dim instance As ImGearDIB
    Dim row As Integer
    Dim value As ImGearArrayRef
     
    value = instance.GetRaster(row)
    public abstract ImGearArrayRef GetRaster( 
       int row
    )
    public: abstract ImGearArrayRef GetRaster( 
       int row
    ) 
    public:
    abstract ImGearArrayRef GetRaster( 
       int row
    ) 

    Parameters

    row
    Number of requested row.

    Return Value

    ImGearArrayRef structure instance that refers to the raster raw store.
    Remarks
    May be used to obtain direct access to the pixels in the raster.

    In ImageGear, all rasters are kept and indexed in the normal form: the first raster is the top raster, the last raster is the bottom raster. This differs from BMP and older ImageGear versions, where rasters are stored in reverse mode: from bottom to top.

    Rasters in ImageGear pixel storage are DWORD-aligned.

    Raster size for standard DIBs (not run-ends) in ImageGear can be calculated using the following formula:

    ((Width * BitsPerChannel * ChannelCount + 31) & ~31) / BitsPerChannel

    The +31 and & ~31 indicate DWORD alignment. The raster size is in terms of channel values. To calculate the raster size in terms of bytes, divide by 8 instead of BitsPerChannel.

    See Also