private static ImageFrame ReadImageFrame(Stream stream, byte[] globalColorTable, GraphicControlExtension graphicControlExtension)
{
var imageDescriptor = ImageDescriptor.Read(stream);
var imageFrame = new ImageFrame
{
ImageDescriptor = imageDescriptor,
LocalColorTable = globalColorTable,
GraphicControlExtension = graphicControlExtension
};
if (imageDescriptor.LocalColorTableFlag)
{
imageFrame.LocalColorTable = stream.ReadBytes(imageDescriptor.LocalColorTableSize * 3);
}
imageFrame.ColorDepth = stream.ReadByte();
var lzwDecoder = new LzwDecoder(stream);
var imageData = lzwDecoder.DecodeImageData(imageDescriptor.ImageWidth, imageDescriptor.ImageHeight, imageFrame.ColorDepth);
ApplicationData.Read(stream);
imageFrame.Bitmap = CreateBitmap(
imageData,
imageFrame.GetPalette(),
imageDescriptor.InterlaceFlag,
imageDescriptor.ImageWidth,
imageDescriptor.ImageHeight);
return imageFrame;
}
public GifFrame(Stream inputStream,
LogicalScreenDescriptor lsd,
ColourTable gct,
GraphicControlExtension gce,
GifFrame previousFrame,
GifFrame previousFrameBut1)
: base(inputStream, lsd, gct, gce, previousFrame, previousFrameBut1)
{
}
public void ConvertFrame()
{
for (var i = 0; i < Frames.Count; i++)
{
var index = i;//(int)context;
var colorTable = colorTables[index];
var localColorTableFlag = (byte)(colorTable == globalColorTable ? 0 : 1);
var localColorTableSize = GetColorTableSize(colorTable);
byte transparentColorFlag = 0, transparentColorIndex = 0;
byte max;
var colorIndexes = GetColorIndexes(Frames[index].Texture, scale, colorTable, localColorTableFlag, ref transparentColorFlag, ref transparentColorIndex, out max);
var graphicControlExtension = new GraphicControlExtension(4, 0, (byte)Frames[index].DisposalMethod, 0, transparentColorFlag, (ushort)(100 * Frames[index].Delay), transparentColorIndex);
var imageDescriptor = new ImageDescriptor(0, 0, Width, Height, localColorTableFlag, 0, 0, 0, localColorTableSize);
var minCodeSize = LzwEncoder.GetMinCodeSize(max);
var lzw = LzwEncoder.Encode(colorIndexes, minCodeSize);
var tableBasedImageData = new TableBasedImageData(minCodeSize, lzw);
var tmpBytes = new List <byte>();
tmpBytes.AddRange(graphicControlExtension.GetBytes());
tmpBytes.AddRange(imageDescriptor.GetBytes());
if (localColorTableFlag == 1)
{
tmpBytes.AddRange(ColorTableToBytes(colorTable, localColorTableSize));
}
tmpBytes.AddRange(tableBasedImageData.GetBytes());
encoded.Add(index, tmpBytes);
// encodeProgress.Progress++;
if (encoded.Count == Frames.Count)
{
var globalColorTableSize = GetColorTableSize(globalColorTable);
var logicalScreenDescriptor = new LogicalScreenDescriptor(Width, Height, 1, 7, 0, globalColorTableSize, 0, 0);
var binary = new List <byte>();
binary.AddRange(Encoding.UTF8.GetBytes(header));
binary.AddRange(logicalScreenDescriptor.GetBytes());
binary.AddRange(ColorTableToBytes(globalColorTable, globalColorTableSize));
binary.AddRange(applicationExtension.GetBytes());
binary.AddRange(encoded.OrderBy(j => j.Key).SelectMany(j => j.Value));
binary.Add(0x3B); // GIF Trailer.
bytes = binary.ToArray();
// encodeProgress.Completed = true;
}
// onProgress(encodeProgress);
}
currentStep++;
}
internal static void CheckGraphicControlExtension(GraphicControlExtension ext)
{
Assert.AreEqual(GraphicControlExtension.ExpectedBlockSize,
ext.BlockSize,
"ExpectedBlockSize");
Assert.AreEqual(DelayTime, ext.DelayTime, "DelayTime");
Assert.AreEqual(DisposalMethod, ext.DisposalMethod, "DisposalMethod");
Assert.AreEqual(TransparentColourIndex,
ext.TransparentColourIndex,
"TransparentColourIndex");
Assert.AreEqual(HasTransparentColour, ext.HasTransparentColour, "HasTransparentColour");
Assert.AreEqual(ExpectsUserInput, ext.ExpectsUserInput, "ExpectsUserInput");
}
private static GifFrame DecodeFrame(GraphicControlExtension extension, ImageDescriptor descriptor, byte[] colorIndexes, bool filled, int Width, int Height, Color[] state)
{
var frame = new GifFrame();
var pixels = state;
var transparentIndex = -1;
if (extension != null)
{
frame.Delay = extension.DelayTime / 100f;
frame.DisposalMethod = (DisposalMethod)extension.DisposalMethod;
if (frame.DisposalMethod == DisposalMethod.RestoreToPrevious)
{
pixels = state.ToArray();
}
if (extension.TransparentColorFlag == 1)
{
transparentIndex = extension.TransparentColorIndex;
}
}
for (var y = 0; y < descriptor.ImageHeight; y++)
{
for (var x = 0; x < descriptor.ImageWidth; x++)
{
var colorIndex = colorIndexes[x + y * descriptor.ImageWidth];
var transparent = colorIndex == transparentIndex;
if (transparent && !filled)
{
continue;
}
var color = EmptyColor; //transparent ? EmptyColor : colorTable[colorIndex];
var fx = x + descriptor.ImageLeftPosition;
var fy = Height - y - 1 - descriptor.ImageTopPosition; // Y-flip
pixels[fx + fy * Width] = pixels[fx + fy * Width] = color;
}
}
frame.Texture = new Texture2D(Width, Height);
frame.Texture.SetPixels32(pixels);
// frame.Texture.Apply();
return(frame);
}
static void SetGraphicControlExtension (byte[] gifBytes, ref int byteIndex, ref GifData gifData)
{
GraphicControlExtension gcEx = new GraphicControlExtension ();
// Extension Introducer(1 Byte)
// 0x21
gcEx.extensionIntroducer = gifBytes[byteIndex];
byteIndex++;
// Graphic Control Label(1 Byte)
// 0xf9
gcEx.graphicControlLabel = gifBytes[byteIndex];
byteIndex++;
// Block Size(1 Byte)
// 0x04
gcEx.blockSize = gifBytes[byteIndex];
byteIndex++;
// 1 Byte
{
// Reserved(3 Bits)
// Unused
// Disposal Mothod(3 Bits)
// 0 (No disposal specified)
// 1 (Do not dispose)
// 2 (Restore to background color)
// 3 (Restore to previous)
switch (gifBytes[byteIndex] & 28) { // 0b00011100
case 4: // 0b00000100
gcEx.disposalMethod = 1;
break;
case 8: // 0b00001000
gcEx.disposalMethod = 2;
break;
case 12: // 0b00001100
gcEx.disposalMethod = 3;
break;
default:
gcEx.disposalMethod = 0;
break;
}
// User Input Flag(1 Bit)
// Unknown
// Transparent Color Flag(1 Bit)
gcEx.transparentColorFlag = (gifBytes[byteIndex] & 1) == 1; // 0b00000001
byteIndex++;
}
// Delay Time(2 Bytes)
gcEx.delayTime = BitConverter.ToUInt16 (gifBytes, byteIndex);
byteIndex += 2;
// Transparent Color Index(1 Byte)
gcEx.transparentColorIndex = gifBytes[byteIndex];
byteIndex++;
// Block Terminator(1 Byte)
gcEx.blockTerminator = gifBytes[byteIndex];
byteIndex++;
if (gifData.graphicCtrlExList == null) {
gifData.graphicCtrlExList = new List<GraphicControlExtension> ();
}
gifData.graphicCtrlExList.Add (gcEx);
}
/// <summary>
/// Get disposal method from GraphicControlExtension
/// </summary>
static ushort GetDisposalMethod (GraphicControlExtension? graphicCtrlEx)
{
return graphicCtrlEx != null ? graphicCtrlEx.Value.disposalMethod : (ushort) 2;
}
/// <summary>
/// Get delay seconds from GraphicControlExtension
/// </summary>
static float GetDelaySec (GraphicControlExtension? graphicCtrlEx)
{
// Get delay sec from GraphicControlExtension
float delaySec = graphicCtrlEx != null ? (float) graphicCtrlEx.Value.delayTime / 100f : 0.1f;
// Minimum 0.1 seconds delay (because major browsers have become so...)
if (delaySec < 0.1f) {
delaySec = 0.1f;
}
return delaySec;
}
/// <summary>
/// Get transparent color index from GraphicControlExtension
/// </summary>
static int GetTransparentIndex (GraphicControlExtension? graphicCtrlEx)
{
int transparentIndex = -1;
if (graphicCtrlEx != null && graphicCtrlEx.Value.transparentColorFlag) {
transparentIndex = graphicCtrlEx.Value.transparentColorIndex;
}
return transparentIndex;
}
private void FinishDecoding()
{
// var globalColorTable = parser.LogicalScreenDescriptor.GlobalColorTableFlag == 1 ? GetUnityColors(parser.GlobalColorTable) : null;
//var backgroundColor = globalColorTable?[parser.LogicalScreenDescriptor.BackgroundColorIndex] ?? EmptyColor;
GraphicControlExtension gcExtension = null;
Width = parser.LogicalScreenDescriptor.LogicalScreenWidth;
Height = parser.LogicalScreenDescriptor.LogicalScreenHeight;
state = new Color[Width * Height];
filled = false;
frames = new List <GifFrame>();
for (var j = 0; j < parser.Blocks.Count; j++)
{
if (parser.Blocks[j] is GraphicControlExtension)
{
gcExtension = (GraphicControlExtension)parser.Blocks[j];
}
else if (parser.Blocks[j] is ImageDescriptor)
{
var imageDescriptor = (ImageDescriptor)parser.Blocks[j];
if (imageDescriptor.InterlaceFlag == 1)
{
throw new NotSupportedException("Interlacing is not supported!");
}
// var colorTable = imageDescriptor.LocalColorTableFlag == 1 ? GetUnityColors((ColorTable) parser.Blocks[j + 1]) : globalColorTable;
var colorIndexes = decoded[imageDescriptor];
var frame = DecodeFrame(gcExtension, imageDescriptor, colorIndexes, filled, Width, Height, state);
frames.Add(frame);
//if (frames.Count == 1 && globalColorTable != null)
//{
// if (gcExtension == null || gcExtension.TransparentColorFlag == 0 || gcExtension.TransparentColorIndex != parser.LogicalScreenDescriptor.BackgroundColorIndex)
// {
// backgroundColor = globalColorTable[parser.LogicalScreenDescriptor.BackgroundColorIndex];
// }
//}
switch (frame.DisposalMethod)
{
case DisposalMethod.NoDisposalSpecified:
case DisposalMethod.DoNotDispose:
break;
case DisposalMethod.RestoreToBackgroundColor:
for (var i = 0; i < state.Length; i++)
{
state[i] = EmptyColor;
}
filled = true;
break;
case DisposalMethod.RestoreToPrevious: // 'state' was already copied before decoding current frame
filled = false;
break;
default:
throw new NotSupportedException($"Unknown disposal method: {frame.DisposalMethod}!");
}
}
}
// return new Gif(frames);
}
private static GifFrame DecodeFrame(GraphicControlExtension extension, ImageDescriptor descriptor, TableBasedImageData data, bool filled, int width, int height, Color32[] state, Color32[] colorTable)
{
var colorIndexes = LzwDecoder.Decode(data.ImageData, data.LzwMinimumCodeSize);
return(DecodeFrame(extension, descriptor, colorIndexes, filled, width, height, state, colorTable));
}
/// <summary>
/// Iterator can be used for large GIF-files in order to display progress bar.
/// </summary>
public IEnumerable <List <byte> > EncodeIterator(int scale = 1)
{
if (_free)
{
if (Frames[0].Texture.width > 256 || Frames[0].Texture.height > 256)
{
throw new Exception("The free version has maximum supported size 256x256 px. Please consider buying the Full version of Power GIF.");
}
if (Frames.Count > 20)
{
throw new Exception("The Free version is limited by 20 frames. Please consider buying the Full version of Power GIF.");
}
}
const string header = "GIF89a";
var width = (ushort)(Frames[0].Texture.width * scale);
var height = (ushort)(Frames[0].Texture.height * scale);
var globalColorTable = new List <Color32>();
var applicationExtension = new ApplicationExtension();
var bytes = new List <byte>();
var colorTables = new List <Color32> [Frames.Count];
var distinctColors = new Dictionary <int, List <Color32> >();
var manualResetEvent = new ManualResetEvent(false);
for (var i = 0; i < Frames.Count; i++)
{
var frame = Frames[i];
ThreadPool.QueueUserWorkItem(context =>
{
var distinct = frame.Texture.GetPixels32().Distinct().ToList();
lock (distinctColors)
{
distinctColors.Add((int)context, distinct);
if (distinctColors.Count == Frames.Count)
{
manualResetEvent.Set();
}
}
}, i);
}
manualResetEvent.WaitOne();
for (var i = 0; i < Frames.Count; i++)
{
var colors = distinctColors[i];
var add = colors.Where(j => !globalColorTable.Contains(j)).ToList();
if (globalColorTable.Count + add.Count <= 256)
{
globalColorTable.AddRange(add);
colorTables[i] = globalColorTable;
}
else if (add.Count <= 256) // Introducing local color table
{
colorTables[i] = colors;
}
else
{
throw new Exception($"Frame #{i} contains more than 256 colors!");
}
}
ReplaceTransparentColor(ref globalColorTable);
for (var i = 0; i < Frames.Count; i++)
{
var frame = Frames[i];
var colorTable = colorTables[i];
var localColorTableFlag = (byte)(colorTable == globalColorTable ? 0 : 1);
var localColorTableSize = GetColorTableSize(colorTable);
byte transparentColorFlag = 0, transparentColorIndex = 0;
byte max;
var colorIndexes = GetColorIndexes(frame.Texture, scale, colorTable, localColorTableFlag, ref transparentColorFlag, ref transparentColorIndex, out max);
var graphicControlExtension = new GraphicControlExtension(4, 0, (byte)frame.DisposalMethod, 0, transparentColorFlag, (ushort)(100 * frame.Delay), transparentColorIndex);
var imageDescriptor = new ImageDescriptor(0, 0, width, height, localColorTableFlag, 0, 0, 0, localColorTableSize);
var minCodeSize = LzwEncoder.GetMinCodeSize(max);
var lzw = LzwEncoder.Encode(colorIndexes, minCodeSize);
var tableBasedImageData = new TableBasedImageData(minCodeSize, lzw);
bytes.Clear();
bytes.AddRange(graphicControlExtension.GetBytes());
bytes.AddRange(imageDescriptor.GetBytes());
if (localColorTableFlag == 1)
{
bytes.AddRange(ColorTableToBytes(colorTable, localColorTableSize));
}
bytes.AddRange(tableBasedImageData.GetBytes());
yield return(bytes);
}
yield return(new List <byte> {
0x3B
}); // GIF Trailer.
// Then output GIF header as last iterator element! This way we can build global color table "on fly" instead of expensive building operation.
var globalColorTableSize = GetColorTableSize(globalColorTable);
var logicalScreenDescriptor = new LogicalScreenDescriptor(width, height, 1, 7, 0, globalColorTableSize, 0, 0);
bytes.Clear();
bytes.AddRange(Encoding.UTF8.GetBytes(header));
bytes.AddRange(logicalScreenDescriptor.GetBytes());
bytes.AddRange(ColorTableToBytes(globalColorTable, globalColorTableSize));
bytes.AddRange(applicationExtension.GetBytes());
yield return(bytes);
}
/// <summary>
/// Encode GIF in multiple threads.
/// </summary>
public void EncodeParallel(Action <EncodeProgress> onProgress, int scale = 1) // TODO: Refact.
{
if (_free)
{
throw new Exception("The Free version doesn't support this feature. Please consider buying the Full version of Power GIF.");
}
const string header = "GIF89a";
var width = (ushort)(Frames[0].Texture.width * scale);
var height = (ushort)(Frames[0].Texture.height * scale);
var globalColorTable = new List <Color32>();
var applicationExtension = new ApplicationExtension();
var encoded = new Dictionary <int, List <byte> >();
var encodeProgress = new EncodeProgress {
FrameCount = Frames.Count
};
var colorTables = new List <Color32> [Frames.Count];
var distinctColors = new Dictionary <int, List <Color32> >();
var manualResetEvent = new ManualResetEvent(false);
for (var i = 0; i < Frames.Count; i++)
{
var frame = Frames[i];
ThreadPool.QueueUserWorkItem(context =>
{
var distinct = frame.Texture.GetPixels32().Distinct().ToList();
lock (distinctColors)
{
distinctColors.Add((int)context, distinct);
if (distinctColors.Count == Frames.Count)
{
manualResetEvent.Set();
}
}
}, i);
}
manualResetEvent.WaitOne();
for (var i = 0; i < Frames.Count; i++)
{
var colors = distinctColors[i];
var add = colors.Where(j => !globalColorTable.Contains(j)).ToList();
if (globalColorTable.Count + add.Count <= 256)
{
globalColorTable.AddRange(add);
colorTables[i] = globalColorTable;
}
else if (colors.Count <= 256) // Introduce local color table.
{
colorTables[i] = colors;
}
else
{
onProgress(new EncodeProgress {
Completed = true, Exception = new Exception($"Frame #{i} contains more than 256 colors!")
});
return;
}
}
ReplaceTransparentColor(ref globalColorTable);
for (var i = 0; i < Frames.Count; i++) // Don't use Parallel.For to leave .NET compatibility.
{
ThreadPool.QueueUserWorkItem(context =>
{
var index = (int)context;
var colorTable = colorTables[index];
var localColorTableFlag = (byte)(colorTable == globalColorTable ? 0 : 1);
var localColorTableSize = GetColorTableSize(colorTable);
byte transparentColorFlag = 0, transparentColorIndex = 0;
byte max;
var colorIndexes = GetColorIndexes(Frames[index].Texture, scale, colorTable, localColorTableFlag, ref transparentColorFlag, ref transparentColorIndex, out max);
var graphicControlExtension = new GraphicControlExtension(4, 0, (byte)Frames[index].DisposalMethod, 0, transparentColorFlag, (ushort)(100 * Frames[index].Delay), transparentColorIndex);
var imageDescriptor = new ImageDescriptor(0, 0, width, height, localColorTableFlag, 0, 0, 0, localColorTableSize);
var minCodeSize = LzwEncoder.GetMinCodeSize(max);
var lzw = LzwEncoder.Encode(colorIndexes, minCodeSize);
var tableBasedImageData = new TableBasedImageData(minCodeSize, lzw);
var bytes = new List <byte>();
bytes.AddRange(graphicControlExtension.GetBytes());
bytes.AddRange(imageDescriptor.GetBytes());
if (localColorTableFlag == 1)
{
bytes.AddRange(ColorTableToBytes(colorTable, localColorTableSize));
}
bytes.AddRange(tableBasedImageData.GetBytes());
lock (encoded)
{
encoded.Add(index, bytes);
encodeProgress.Progress++;
if (encoded.Count == Frames.Count)
{
var globalColorTableSize = GetColorTableSize(globalColorTable);
var logicalScreenDescriptor = new LogicalScreenDescriptor(width, height, 1, 7, 0, globalColorTableSize, 0, 0);
var binary = new List <byte>();
binary.AddRange(Encoding.UTF8.GetBytes(header));
binary.AddRange(logicalScreenDescriptor.GetBytes());
binary.AddRange(ColorTableToBytes(globalColorTable, globalColorTableSize));
binary.AddRange(applicationExtension.GetBytes());
binary.AddRange(encoded.OrderBy(j => j.Key).SelectMany(j => j.Value));
binary.Add(0x3B); // GIF Trailer.
encodeProgress.Bytes = binary.ToArray();
encodeProgress.Completed = true;
}
onProgress(encodeProgress);
}
}, i);
}
}
/// <summary>
/// Iterator can be used for large GIF-files in order to display progress bar.
/// </summary>
public static IEnumerable <GifFrame> DecodeIterator(byte[] bytes)
{
var parser = new GifParser(bytes);
var blocks = parser.Blocks;
var width = parser.LogicalScreenDescriptor.LogicalScreenWidth;
var height = parser.LogicalScreenDescriptor.LogicalScreenHeight;
var globalColorTable = parser.LogicalScreenDescriptor.GlobalColorTableFlag == 1 ? GetUnityColors(parser.GlobalColorTable) : null;
//var backgroundColor = globalColorTable?[parser.LogicalScreenDescriptor.BackgroundColorIndex] ?? EmptyColor;
GraphicControlExtension graphicControlExtension = null;
var state = new Color32[width * height];
var filled = false;
for (var j = 0; j < parser.Blocks.Count; j++)
{
if (blocks[j] is GraphicControlExtension)
{
graphicControlExtension = (GraphicControlExtension)blocks[j];
}
else if (blocks[j] is ImageDescriptor)
{
var imageDescriptor = (ImageDescriptor)blocks[j];
if (imageDescriptor.InterlaceFlag == 1)
{
throw new NotSupportedException("Interlacing is not supported!");
}
var colorTable = imageDescriptor.LocalColorTableFlag == 1 ? GetUnityColors((ColorTable)blocks[j + 1]) : globalColorTable;
var data = (TableBasedImageData)blocks[j + 1 + imageDescriptor.LocalColorTableFlag];
var frame = DecodeFrame(graphicControlExtension, imageDescriptor, data, filled, width, height, state, colorTable);
if (_free)
{
if (frame.Texture.width > 256 || frame.Texture.height > 256)
{
throw new Exception("The Free version has maximum supported size 256x256 px. Please consider buying the Full version of Power GIF.");
}
//if (++frames > 20) throw new Exception("The Free version is limited by 20 frames. Please consider buying the Full version of Power GIF.");
}
yield return(frame);
switch (frame.DisposalMethod)
{
case DisposalMethod.NoDisposalSpecified:
case DisposalMethod.DoNotDispose:
break;
case DisposalMethod.RestoreToBackgroundColor:
for (var i = 0; i < state.Length; i++)
{
state[i] = EmptyColor;
}
filled = true;
break;
case DisposalMethod.RestoreToPrevious: // 'state' was already copied before decoding current frame
filled = false;
break;
default:
throw new NotSupportedException($"Unknown disposal method: {frame.DisposalMethod}!");
}
}
}
}
