110 lines
3.5 KiB
C#
110 lines
3.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Threading.Tasks;
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using CdgLib.SubCode;
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namespace CdgLib
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{
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public class GraphicsFile : FileStream
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{
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private const int ColourTableSize = 16;
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private const int CdgPacketSize = 24;
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private const int TileHeight = 12;
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private const int TileWidth = 6;
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public const int FullWidth = 300;
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public const int FullHeight = 216;
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private readonly int[] _mColourTable = new int[ColourTableSize];
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private readonly byte[,] _mPixelColours = new byte[FullHeight, FullWidth];
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private long _previousPosition;
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public GraphicsFile(string path, FileMode mode, FileAccess fileAccess) : base(path, mode, fileAccess, FileShare.Read)
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{
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}
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public bool Transparent => true;
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public long Duration => Length/CdgPacketSize*1000/300;
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public async Task<Bitmap> RenderAtTime(long position = -1)
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{
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if (position < 0)
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{
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position = _previousPosition + CdgPacketSize;
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}
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if (position < _previousPosition)
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{
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// Reset();
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}
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//duration of one packet is 1/300 seconds (4 packets per sector, 75 sectors per second)
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//p=t*3/10 t=p*10/3 t=milliseconds, p=packets
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var timeToRender = position - _previousPosition;
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_previousPosition += timeToRender;
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var numberOfSubCodePackets = timeToRender*3/10;
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var subCodePackets = await ReadSubCodeAsync(numberOfSubCodePackets);
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foreach (var subCodePacket in subCodePackets)
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{
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// ProcessPacket(subCodePacket);
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}
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RenderSurface();
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}
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private async Task<IEnumerable<Packet>> ReadSubCodeAsync(long numberOfPackets)
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{
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var subCodePackets = new List<Packet>();
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var buffer = new byte[CdgPacketSize*numberOfPackets];
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var bytesRead = await ReadAsync(buffer, 0, buffer.Length);
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for (var i = 0; i < bytesRead/CdgPacketSize; i++)
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{
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var subCodePacket = new Packet();
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Array.Copy(buffer, i*CdgPacketSize + 0, subCodePacket.Command, 0, 1);
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Array.Copy(buffer, i*CdgPacketSize + 1, subCodePacket.Instruction, 0, 1);
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Array.Copy(buffer, i*CdgPacketSize + 2, subCodePacket.ParityQ, 0, 2);
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Array.Copy(buffer, i*CdgPacketSize + 4, subCodePacket.Data, 0, 16);
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Array.Copy(buffer, i*CdgPacketSize + 20, subCodePacket.ParityP, 0, 4);
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subCodePackets.Add(subCodePacket);
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}
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return subCodePackets;
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}
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private void RenderSurface()
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{
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if (_mPSurface == null)
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return;
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for (var ri = 0; ri <= FullHeight - 1; ri++)
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{
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for (var ci = 0; ci <= FullWidth - 1; ci++)
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{
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if (ri < TileHeight || ri >= FullHeight - TileHeight || ci < TileWidth ||
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ci >= FullWidth - TileWidth)
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{
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// _mPSurface.RgbData[ri, ci] = _mColourTable[_mBorderColourIndex];
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}
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else
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{
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_mPSurface.RgbData[ri, ci] = _mColourTable[_mPixelColours[ri + _mVOffset, ci + _mHOffset]];
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}
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}
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}
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}
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}
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} |