/// <summary>
/// Creates an empty <see cref="TgaImage"/> with the given specification.
/// </summary>
/// <param name="width">The width in pixels.</param>
/// <param name="height">The height in pixels.</param>
/// <param name="format">The <see cref="TgaFormat"/> to create the image in.</param>
public TgaImage(int width, int height, TgaFormat format)
{
if (width < 0 || width > ushort.MaxValue)
{
throw new ArgumentOutOfRangeException(nameof(width));
}
if (height < 0 || height > ushort.MaxValue)
{
throw new ArgumentOutOfRangeException(nameof(height));
}
header = new TgaHeader
{
ImageType = 2,
ColorMapSpec = new TgaColorMapSpec {
},
ImageSpec = new TgaImageSpec
{
ImageWidth = (ushort)width,
ImageHeight = (ushort)height,
BitsPerPixel = 16,
AlphaWidthAndDirection = (byte)(format == TgaFormat.Argb4 ? 36 : 32),
}
};
data = new TgaImageData
{
ColorMapData = new byte[0],
ImageId = new byte[0],
PixelData = new byte[width * height * 2],
};
}
/// <summary>
/// Creates a TGA format image from a <see cref="Bitmap"/>.
/// </summary>
/// <param name="bitmap">The <see cref="Bitmap"/> to create the image from.</param>
/// <param name="format">The <see cref="TgaFormat"/> to use.</param>
/// <returns>The converted image's TGA representation.</returns>
public static TgaImage FromBitmap(Bitmap bitmap, TgaFormat format)
{
if (bitmap == null)
{
throw new ArgumentNullException(nameof(bitmap));
}
var img = new TgaImage(bitmap.Width, bitmap.Height, format);
var data = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size),
ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
unsafe
{
byte *scan0 = (byte *)data.Scan0.ToPointer();
for (int y = 0; y < img.Height; ++y)
{
for (int x = 0; x < img.Width; ++x)
{
byte *rawData = scan0 + y * data.Stride + x * 4;
var col = Color.FromArgb(((int *)rawData)[0]);
img.SetPixel(x, y, col);
}
}
}
return(img);
}