public RawTGABitmap(int width, int height, byte[] data, TGAPixelFormat format)
{
Width = width;
Height = height;
Data = data;
Format = format;
}
public RawTGABitmap(int width, int height, byte[] data, TGAPixelFormat format)
{
Width = width;
Height = height;
Data = data;
Format = format;
}
/// <summary>
/// Loads the thumbnail of the loaded image file, if any.
/// </summary>
/// <param name="binReader">A BinaryReader that points the loaded file byte stream.</param>
/// <param name="pfPixelFormat">A PixelFormat value indicating what pixel format to use when loading the thumbnail.</param>
private void LoadThumbnail(BinaryReader binReader, TGAPixelFormat pfPixelFormat)
{
// read the Thumbnail image data into a byte array
// take into account stride has to be a multiple of 4
// use padding to make sure multiple of 4
byte[] data = null;
if (binReader != null && binReader.BaseStream != null && binReader.BaseStream.Length > 0 && binReader.BaseStream.CanSeek == true)
{
if (this.ExtensionArea.PostageStampOffset > 0)
{
// seek to the beginning of the image data using the ImageDataOffset value
binReader.BaseStream.Seek(this.ExtensionArea.PostageStampOffset, SeekOrigin.Begin);
int iWidth = (int)binReader.ReadByte();
int iHeight = (int)binReader.ReadByte();
int iStride = ((iWidth * (int)this.objTargaHeader.PixelDepth + 31) & ~31) >> 3; // width in bytes
int iPadding = iStride - (((iWidth * (int)this.objTargaHeader.PixelDepth) + 7) / 8);
System.Collections.Generic.List<System.Collections.Generic.List<byte>> objRows = new System.Collections.Generic.List<System.Collections.Generic.List<byte>>();
System.Collections.Generic.List<byte> objRow = new System.Collections.Generic.List<byte>();
byte[] padding = new byte[iPadding];
MemoryStream msData = null;
bool blnEachRowReverse = false;
bool blnRowsReverse = false;
using (msData = new MemoryStream())
{
// get the size in bytes of each row in the image
int intImageRowByteSize = iWidth * ((int)this.objTargaHeader.PixelDepth / 8);
// get the size in bytes of the whole image
int intImageByteSize = intImageRowByteSize * iHeight;
// thumbnails are never compressed
for (int i = 0; i < iHeight; i++)
{
for (int j = 0; j < intImageRowByteSize; j++)
{
objRow.Add(binReader.ReadByte());
}
objRows.Add(objRow);
objRow = new System.Collections.Generic.List<byte>();
}
switch (this.objTargaHeader.FirstPixelDestination)
{
case FirstPixelDestination.TOP_LEFT:
break;
case FirstPixelDestination.TOP_RIGHT:
blnRowsReverse = false;
blnEachRowReverse = false;
break;
case FirstPixelDestination.BOTTOM_LEFT:
break;
case FirstPixelDestination.BOTTOM_RIGHT:
case FirstPixelDestination.UNKNOWN:
blnRowsReverse = true;
blnEachRowReverse = false;
break;
}
if (blnRowsReverse == true)
objRows.Reverse();
for (int i = 0; i < objRows.Count; i++)
{
if (blnEachRowReverse == true)
objRows[i].Reverse();
byte[] brow = objRows[i].ToArray();
msData.Write(brow, 0, brow.Length);
msData.Write(padding, 0, padding.Length);
}
data = msData.ToArray();
}
if (data != null && data.Length > 0)
{
this.bmpImageThumbnail = new RawTGABitmap(iWidth, iHeight, data, pfPixelFormat);
}
}
}
}
