/// <summary>
/// This will decode a bitmap array, or if data is not an array, return an array with the single bitmap element
/// </summary>
/// <param name="data">Data</param>
/// <returns>Array of <see cref="DecodedBitmap" />, one per bitmap, null if the bitmap could not be decoded</returns>
public static DecodedBitmap[] DecodeBitmap(byte[] data)
{
long pos = 0;
BitmapArrayHeader bitmapArrayHeader;
byte[] buffer = new byte[Marshal.SizeOf(typeof(BitmapInfoHeader))];
List <DecodedBitmap> bitmaps = new List <DecodedBitmap>();
do
{
Array.Copy(data, pos, buffer, 0, buffer.Length);
bitmapArrayHeader = BigEndianMarshal.ByteArrayToStructureLittleEndian <BitmapArrayHeader>(buffer);
long remaining;
if (bitmapArrayHeader.Type == TYPE_BITMAP_ARRAY)
{
remaining = bitmapArrayHeader.Size - Marshal.SizeOf(typeof(BitmapArrayHeader));
pos += Marshal.SizeOf(typeof(BitmapArrayHeader));
}
else
{
remaining = 1;
pos = 0;
bitmapArrayHeader.Next = 0;
}
while (remaining > 0)
{
buffer = new byte[Marshal.SizeOf(typeof(BitmapInfoHeader))];
Array.Copy(data, pos, buffer, 0, buffer.Length);
BitmapInfoHeader bitmapFileHeader =
BigEndianMarshal.ByteArrayToStructureLittleEndian <BitmapInfoHeader>(buffer);
// Stop at unknown header
if (bitmapFileHeader.Fix != 12)
{
break;
}
// Multiplanes not supported
if (bitmapFileHeader.Planes != 1)
{
break;
}
// TODO: Non paletted?
pos += Marshal.SizeOf(typeof(BitmapInfoHeader));
Rgb[] palette = new Rgb[1 << bitmapFileHeader.BitsPerPlane];
buffer = new byte[Marshal.SizeOf(typeof(Rgb))];
for (int i = 0; i < palette.Length; i++)
{
Array.Copy(data, pos, buffer, 0, buffer.Length);
pos += buffer.Length;
palette[i] = BigEndianMarshal.ByteArrayToStructureLittleEndian <Rgb>(buffer);
}
remaining -= bitmapFileHeader.Fix;
// rgb[1];
remaining -= 1;
// TODO (Optimize): Calculate real data length considering that every line is word-aligned (2-byte)
long dataLength = 0;
for (int y = 0; y < bitmapFileHeader.Y; y++)
{
int x = 0;
while (x < bitmapFileHeader.X)
{
for (int k = 8 - bitmapFileHeader.BitsPerPlane; k >= 0;
k -= (int)bitmapFileHeader.BitsPerPlane)
{
x++;
}
dataLength++;
}
dataLength += dataLength % 2;
}
buffer = new byte[dataLength];
Array.Copy(data, bitmapFileHeader.Offset, buffer, 0, buffer.Length);
DecodedBitmap bitmap = DecodeBitmap(bitmapFileHeader, palette, buffer);
// Mask palette
int[] argbPalette = new int[palette.Length];
for (int c = 0; c < palette.Length; c++)
{
argbPalette[c] = (palette[c].Red << 16) + (palette[c].Green << 8) + palette[c].Blue;
}
// First image, then mask
if (bitmapFileHeader.Type == TYPE_ICON || bitmapFileHeader.Type == TYPE_POINTER)
{
int[] icon = new int[bitmap.Width * bitmap.Height / 2];
int[] mask = new int[bitmap.Width * bitmap.Height / 2];
Array.Copy(bitmap.Pixels, 0, icon, 0, icon.Length);
Array.Copy(bitmap.Pixels, icon.Length, mask, 0, mask.Length);
bitmap.Pixels = new int[bitmap.Width * bitmap.Height / 2];
bitmap.Height /= 2;
for (int px = 0; px < bitmap.Pixels.Length; px++)
{
bitmap.Pixels[px] = icon[px] + (mask[px] == argbPalette[0] ? VISIBLE : 0);
}
}
// We got the mask, now we need to read the color
else if (bitmapFileHeader.Type == TYPE_COLOR_ICON || bitmapFileHeader.Type == TYPE_COLOR_POINTER)
{
DecodedBitmap mask = bitmap;
buffer = new byte[Marshal.SizeOf(typeof(BitmapInfoHeader))];
Array.Copy(data, pos, buffer, 0, buffer.Length);
bitmapFileHeader = BigEndianMarshal.ByteArrayToStructureLittleEndian <BitmapInfoHeader>(buffer);
// Stop at unknown header
if (bitmapFileHeader.Size != Marshal.SizeOf(typeof(BitmapInfoHeader)))
{
break;
}
// Multiplanes not supported
if (bitmapFileHeader.Planes != 1)
{
break;
}
// TODO: Non paletted?
pos += bitmapFileHeader.Size;
palette = new Rgb[1 << bitmapFileHeader.BitsPerPlane];
buffer = new byte[Marshal.SizeOf(typeof(Rgb))];
for (int i = 0; i < palette.Length; i++)
{
Array.Copy(data, pos, buffer, 0, buffer.Length);
pos += buffer.Length;
palette[i] = BigEndianMarshal.ByteArrayToStructureLittleEndian <Rgb>(buffer);
}
remaining -= bitmapFileHeader.Fix;
// rgb[1];
remaining -= 1;
// TODO (Optimize): Calculate real data length considering that every line is word-aligned (2-byte)
dataLength = 0;
for (int y = 0; y < bitmapFileHeader.Y; y++)
{
int x = 0;
while (x < bitmapFileHeader.X)
{
for (int k = 8 - bitmapFileHeader.BitsPerPlane; k >= 0;
k -= (int)bitmapFileHeader.BitsPerPlane)
{
x++;
}
dataLength++;
}
dataLength += dataLength % 2;
}
buffer = new byte[dataLength];
Array.Copy(data, bitmapFileHeader.Offset, buffer, 0, buffer.Length);
bitmap = DecodeBitmap(bitmapFileHeader, palette, buffer);
for (int px = 0; px < bitmap.Pixels.Length; px++)
{
bitmap.Pixels[px] = bitmap.Pixels[px] +
(mask.Pixels[px + bitmapFileHeader.X * bitmapFileHeader.Y] ==
argbPalette[0]
? VISIBLE
: 0);
}
}
// Not an icon, all pixels are visible
else
{
for (int px = 0; px < bitmap.Pixels.Length; px++)
{
bitmap.Pixels[px] = bitmap.Pixels[px] + VISIBLE;
}
}
// Need to reverse first all pixels then by line
int[] pixels = bitmap.Pixels.Reverse().ToArray();
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
bitmap.Pixels[y * bitmap.Width + (bitmap.Width - x - 1)] = pixels[y * bitmap.Width + x];
}
}
bitmaps.Add(bitmap);
}
pos = bitmapArrayHeader.Next;
}while(bitmapArrayHeader.Next != 0);
return(bitmaps.ToArray());
}
// TODO: Mask is not correctly decoded on XGA icons (20x20 and 40x40)...
static DecodedBitmap DecodeBitmap(BitmapInfoHeader header, IList <Rgb> palette, byte[] data)
{
DecodedBitmap bitmap = new DecodedBitmap
{
BitsPerPixel = header.BitsPerPlane,
Height = header.Y,
Width = header.X,
XHotspot = header.XHotspot,
YHostpot = header.YHostpot,
Pixels = new int[header.X * header.Y]
};
switch (header.Type)
{
case TYPE_ICON:
bitmap.Type = "Icon";
break;
case TYPE_BITMAP:
bitmap.Type = "Bitmap";
break;
case TYPE_POINTER:
bitmap.Type = "Pointer";
break;
case TYPE_COLOR_ICON:
bitmap.Type = "Color Icon";
break;
case TYPE_COLOR_POINTER:
bitmap.Type = "Color Pointer";
break;
default: return(null);
}
int[] argbPalette = new int[palette.Count];
for (int c = 0; c < palette.Count; c++)
{
argbPalette[c] = (palette[c].Red << 16) + (palette[c].Green << 8) + palette[c].Blue;
}
long pos = 0;
for (int y = 0; y < bitmap.Height; y++)
{
int x = 0;
while (x < bitmap.Width)
{
for (int k = (int)(8 - bitmap.BitsPerPixel); k >= 0; k -= (int)bitmap.BitsPerPixel)
{
bitmap.Pixels[y * bitmap.Width + x] =
argbPalette[(data[pos] >> k) & ((1 << (int)bitmap.BitsPerPixel) - 1)];
x++;
if (x == bitmap.Width)
{
break;
}
}
pos++;
}
pos += pos % 2;
}
return(bitmap);
}