/// <summary>
/// Reads the image data bytes from the file and loads them into the Image Bitmap object.
/// Also loads the color map, if any, into the Image Bitmap.
/// </summary>
/// <param name="binReader">A BinaryReader that points the loaded file byte stream.</param>
private void LoadTGAImage(BinaryReader binReader)
{
//************** NOTE *******************
// The memory allocated for Microsoft Bitmaps must be aligned on a 32bit boundary.
// The stride refers to the number of bytes allocated for one scanline of the bitmap.
// In your loop, you copy the pixels one scanline at a time and take into
// consideration the amount of padding that occurs due to memory alignment.
// calculate the stride, in bytes, of the image (32bit aligned width of each image row)
this.intStride = (((int)this.objTargaHeader.Width * (int)this.objTargaHeader.PixelDepth + 31) & ~31) >> 3; // width in bytes
// calculate the padding, in bytes, of the image
// number of bytes to add to make each row a 32bit aligned row
// padding in bytes
this.intPadding = this.intStride - ((((int)this.objTargaHeader.Width * (int)this.objTargaHeader.PixelDepth) + 7) / 8);
// get the image data bytes
byte[] bimagedata = this.LoadImageBytes(binReader);
// get the Pixel format to use with the Bitmap object
TGAPixelFormat pf = this.GetPixelFormat();
// create a Bitmap object using the image Width, Height,
// Stride, PixelFormat and the pointer to the pinned byte array.
this.bmpTargaImage = new RawTGABitmap((int)this.objTargaHeader.Width,
(int)this.objTargaHeader.Height,
bimagedata,
pf);
this.LoadThumbnail(binReader, pf);
/*
// load the color map into the Bitmap, if it exists
if (this.objTargaHeader.ColorMap.Count > 0)
{
// get the Bitmap's current palette
ColorPalette pal = this.bmpTargaImage.Palette;
// loop trough each color in the loaded file's color map
for (int i = 0; i < this.objTargaHeader.ColorMap.Count; i++)
{
// is the AttributesType 0 or 1 bit
if (this.objTargaExtensionArea.AttributesType == 0 ||
this.objTargaExtensionArea.AttributesType == 1)
// use 255 for alpha ( 255 = opaque/visible ) so we can see the image
pal.Entries[i] = Color.FromArgb(255, this.objTargaHeader.ColorMap[i].R, this.objTargaHeader.ColorMap[i].G, this.objTargaHeader.ColorMap[i].B);
else
// use whatever value is there
pal.Entries[i] = this.objTargaHeader.ColorMap[i];
}
// set the new palette back to the Bitmap object
this.bmpTargaImage.Palette = pal;
// set the palette to the thumbnail also, if there is one
if (this.bmpImageThumbnail != null)
{
this.bmpImageThumbnail.Palette = pal;
}
}
*/
// check to see if this is a Black and White (Greyscale)
//if (this.objTargaHeader.PixelDepth == 8 && (this.objTargaHeader.ImageType == ImageType.UNCOMPRESSED_BLACK_AND_WHITE ||
// this.objTargaHeader.ImageType == ImageType.RUN_LENGTH_ENCODED_BLACK_AND_WHITE))
}
/// <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);
}
}
}
}
/// <summary>
/// Creates a new instance of the TargaImage object.
/// </summary>
public TargaImage()
{
this.objTargaFooter = new TargaFooter();
this.objTargaHeader = new TargaHeader();
this.objTargaExtensionArea = new TargaExtensionArea();
this.bmpTargaImage = null;
this.bmpImageThumbnail = null;
}
