/// <summary>
/// Display a specific sigle frame - 1 based
/// I frame can be shown immediately, otherwise mulitple frames must be decoded
/// backuo to find the I frame or start with P
/// </summary>
public void DisplayFrame(ushort frame, ushort xPos = 0, ushort yPos = 0, ushort zoom = 1)
{
Console.WriteLine($"Display Frame {frame} - {Data.Name}");
bool displayed = false;
DecodedFrameDef F = DFrames[frame - 1];
if (F.Type == FrameType.I)
{
Display(F.Ifd, xPos, yPos, zoom);
displayed = true;
}
else
{
var look = frame - 1;
while (look >= 0)
{
F = DFrames[look];
if (F.Type == FrameType.I)
{
Console.WriteLine($"starting at frame {look + 1}");
Display(F.Ifd, xPos, yPos, zoom);
displayed = true;
// Show the interveneing frames to get to the desired one
for (var f = look + 1; f < frame; f++)
{
var FF = DFrames[f];
Console.WriteLine($" then frame {f + 1} {FF.Type}");
if (FF.Type == FrameType.P)
{
Display(FF.Pfd, xPos, yPos, zoom);
}
}
look = -1;
}
else
{
look -= 1;
}
}
}
if (!displayed)
{
F = DFrames[frame - 1];
if (F.Type == FrameType.P)
{
Display(F.Pfd, xPos, yPos, zoom);
displayed = true;
}
}
if (displayed)
{
graphics.Show();
}
else
{
Console.WriteLine($"WARNING !! Frame {frame} could not be displayed - {Data.Name}");
}
}
private void LoadFrames()
{
Frames = new List <FrameDef>();
int i = 0;
do
{
string t = Data.FramesHex.Substring(i, 2);
int num = int.Parse(t, NumberStyles.AllowHexSpecifier);
i += 2;
if (Enum.IsDefined(typeof(FrameType), num))
{
FrameType FT = (FrameType)num;
t = Data.FramesHex.Substring(i, 4);
num = int.Parse(t, NumberStyles.AllowHexSpecifier);
i += 4;
int mult = 1;
if (FT == FrameType.P)
{
// how to tell 8bit or 16bit position - if row is the same 6 bytes later then 16bits
if (Data.FramesHex.Substring(i, 2) == Data.FramesHex.Substring(i + 6, 2))
{
mult = 6;
}
else
{
mult = 4;
}
Frames.Add(new FrameDef()
{
Type = FT, Count = (ushort)num, Data = Data.FramesHex.Substring(i, num * mult)
});
}
else if (FT == FrameType.I)
{
mult = 2;
Frames.Add(new FrameDef()
{
Type = FT, Count = (ushort)num, Data = Data.FramesHex.Substring(i, num * mult)
});
}
else if (FT == FrameType.D || FT == FrameType.F)
{
Frames.Add(new FrameDef()
{
Type = FT, Count = (ushort)num, Data = ""
});
}
i += num * mult;
Console.WriteLine($" Frame {Frames.Count} is {FT} {num}");
}
else
{
Console.WriteLine($" WARNING!! Unexpected Frame Type {num:X2}");
i += 4; // ? how many bytes to skip for unknown frame type
}
} while (i < Data.FramesHexLength);
// further decode the frames to remove all the Hex strings
DFrames = new List <DecodedFrameDef>();
foreach (var F in Frames)
{
DecodedFrameDef F2 = new DecodedFrameDef()
{
Type = F.Type, Count = F.Count
};
switch (F.Type)
{
case FrameType.I:
F2.Ifd = GetIFrame(F);
F2.Pfd = null;
break;
case FrameType.P:
F2.Pfd = GetPFrame(F);
F2.Ifd = null;
break;
case FrameType.D:
case FrameType.F:
F2.Ifd = null;
F2.Pfd = null;
break;
}
DFrames.Add(F2);
}
if (Frames.Count == Data.FrameCount)
{
Console.WriteLine($" Loaded {Frames.Count} Frames");
}
else
{
Console.WriteLine($" WARNING !!! - Loaded {Frames.Count} Frames but expected {Data.FrameCount} !!");
}
Frames = null; // GC
}
