/// <summary>
/// Decode caption from the input stream
/// </summary>
/// <returns>bitmap of the decoded caption</returns>
public static Bitmap DecodeImage(PcsObject pcs, IList<OdsData> data, List<PaletteInfo> palettes)
{
if (pcs == null || data == null || data.Count == 0)
return new Bitmap(1, 1);
int w = data[0].Size.Width;
int h = data[0].Size.Height;
var bm = new FastBitmap(new Bitmap(w, h));
bm.LockImage();
BluRaySupPalette pal = DecodePalette(palettes);
int index = 0;
int ofs = 0;
int xpos = 0;
byte[] buf = data[0].Fragment.ImageBuffer;
index = 0;
do
{
int b = buf[index++] & 0xff;
if (b == 0 && index < buf.Length)
{
b = buf[index++] & 0xff;
if (b == 0)
{
// next line
ofs = (ofs / w) * w;
if (xpos < w)
ofs += w;
xpos = 0;
}
else
{
int size;
if ((b & 0xC0) == 0x40)
{
if (index < buf.Length)
{
// 00 4x xx -> xxx zeroes
size = ((b - 0x40) << 8) + (buf[index++] & 0xff);
Color c = Color.FromArgb(pal.GetArgb(0));
for (int i = 0; i < size; i++)
PutPixel(bm, ofs++, c);
xpos += size;
}
}
else if ((b & 0xC0) == 0x80)
{
if (index < buf.Length)
{
// 00 8x yy -> x times value y
size = (b - 0x80);
b = buf[index++] & 0xff;
Color c = Color.FromArgb(pal.GetArgb(b));
for (int i = 0; i < size; i++)
PutPixel(bm, ofs++, c);
xpos += size;
}
}
else if ((b & 0xC0) != 0)
{
if (index < buf.Length)
{
// 00 cx yy zz -> xyy times value z
size = ((b - 0xC0) << 8) + (buf[index++] & 0xff);
b = buf[index++] & 0xff;
Color c = Color.FromArgb(pal.GetArgb(b));
for (int i = 0; i < size; i++)
PutPixel(bm, ofs++, c);
xpos += size;
}
}
else
{
// 00 xx -> xx times 0
Color c = Color.FromArgb(pal.GetArgb(0));
for (int i = 0; i < b; i++)
PutPixel(bm, ofs++, c);
xpos += b;
}
}
}
else
{
PutPixel(bm, ofs++, b, pal);
xpos++;
}
} while (index < buf.Length);
bm.UnlockImage();
return bm.GetBitmap();
}
private static Bitmap CropBitmapAndUnlok(FastBitmap bmp, Color backgroundColor)
{
int y = 0;
int x;
Color c = backgroundColor;
int backgroundArgb = backgroundColor.ToArgb();
// Crop top
while (y < bmp.Height && IsBackgroundColor(c, backgroundArgb))
{
c = bmp.GetPixel(0, y);
if (IsBackgroundColor(c, backgroundArgb))
{
for (x = 1; x < bmp.Width; x++)
{
c = bmp.GetPixelNext();
if (c.A != 0 && c.ToArgb() != backgroundArgb)
break;
}
}
if (IsBackgroundColor(c, backgroundArgb))
y++;
}
int minY = y;
if (minY > 3)
minY -= 3;
else
minY = 0;
// Crop left
x = 0;
c = backgroundColor;
while (x < bmp.Width && IsBackgroundColor(c, backgroundArgb))
{
for (y = minY; y < bmp.Height; y++)
{
c = bmp.GetPixel(x, y);
if (!IsBackgroundColor(c, backgroundArgb))
break;
}
if (IsBackgroundColor(c, backgroundArgb))
x++;
}
int minX = x;
if (minX > 3)
minX -= 3;
else
minX -= 0;
// Crop bottom
y = bmp.Height - 1;
c = backgroundColor;
while (y > minY && IsBackgroundColor(c, backgroundArgb))
{
c = bmp.GetPixel(0, y);
if (IsBackgroundColor(c, backgroundArgb))
{
for (x = 1; x < bmp.Width; x++)
{
c = bmp.GetPixelNext();
if (!IsBackgroundColor(c, backgroundArgb))
break;
}
}
if (IsBackgroundColor(c, backgroundArgb))
y--;
}
int maxY = y + 7;
if (maxY >= bmp.Height)
maxY = bmp.Height - 1;
// Crop right
x = bmp.Width - 1;
c = backgroundColor;
while (x > minX && IsBackgroundColor(c, backgroundArgb))
{
for (y = minY; y < bmp.Height; y++)
{
c = bmp.GetPixel(x, y);
if (!IsBackgroundColor(c, backgroundArgb))
break;
}
if (IsBackgroundColor(c, backgroundArgb))
x--;
}
int maxX = x + 7;
if (maxX >= bmp.Width)
maxX = bmp.Width - 1;
bmp.UnlockImage();
Bitmap bmpImage = bmp.GetBitmap();
if (bmpImage.Width > 1 && bmpImage.Height > 1 && maxX - minX > 0 && maxY - minY > 0)
{
Bitmap bmpCrop = bmpImage.Clone(new Rectangle(minX, minY, maxX - minX, maxY - minY), bmpImage.PixelFormat);
return bmpCrop;
}
return (Bitmap)bmpImage.Clone();
}
