public OP2BitmapFile GetImage(int index)
{
artFile.VerifyImageIndexInBounds(index);
ImageMeta imageMeta = artFile.imageMetas[index];
Color[] palette;
if (imageMeta.type.bShadow != 0)
{
// Shadow graphic uses a 2 color palette
palette = new Color[2];
System.Array.Copy(artFile.palettes[imageMeta.paletteIndex].colors, palette, palette.Length);
}
else
{
// Normal graphic
palette = new Color[artFile.palettes[imageMeta.paletteIndex].colors.Length];
System.Array.Copy(artFile.palettes[imageMeta.paletteIndex].colors, palette, palette.Length);
}
// Palette length is always 256 for OP2's master BMP
uint pixelOffset = (uint)(imageMeta.pixelDataOffset + 14 + ImageHeader.SizeInBytes + 256 * Color.SizeInBytes);
int height = (int)System.Math.Abs(imageMeta.height);
int pitch = ImageHeader.CalculatePitch(imageMeta.GetBitCount(), (int)imageMeta.width);
SliceStream pixels = GetPixels(pixelOffset, (uint)(height * pitch));
byte[] pixelContainer = new byte[height * pitch];
pixels.Read(pixelContainer, 0, pixelContainer.Length);
// Outpost 2 stores pixels in normal raster scan order (top-down). This requires a negative height for BMP file format.
if (imageMeta.height > uint.MaxValue)
{
throw new System.Exception("Image height is too large to fit in standard bitmap file format.");
}
return(new OP2BitmapFile(imageMeta, palette, pixelContainer));
}
/// <summary>
/// Constructor from OP2 meta and bitmap data.
/// </summary>
public OP2BitmapFile(ImageMeta meta, Color[] palette, byte[] indexedPixels) : base(meta.GetBitCount(), meta.width, (int)-meta.height, palette, indexedPixels)
{
imageMeta = meta;
}