public static Tag Read(AsepriteStreamReader reader)
{
//WORD From frame
var fromFrame = reader.WORD();
//WORD To frame
var toFrame = reader.WORD();
//BYTE Loop animation direction
// 0 = Forward
// 1 = Reverse
// 2 = Ping - pong
var loopDirection = (LoopDirections)reader.BYTE();
//BYTE[8] For future(set to zero)
reader.BYTES(8);
//BYTE[3] RGB values of the tag color
var color = reader.BYTES(3);
//BYTE Extra byte(zero)
reader.BYTE();
//STRING Tag name
var name = reader.STRING();
return(new Tag(fromFrame, toFrame, loopDirection, color, name));
}
public static LayerChunk Read(AsepriteStreamReader reader)
{
// WORD Flags:
// 1 = Visible
// 2 = Editable
// 4 = Lock movement
// 8 = Background
// 16 = Prefer linked cels
// 32 = The layer group should be displayed collapsed
// 64 = The layer is a reference layer
var flags = (LayerFlags)reader.WORD();
// WORD Layer type
// 0 = Normal(image) layer
// 1 = Group
var type = (LayerTypes)reader.WORD();
// WORD Layer child level(see NOTE.1)
var childLevel = reader.WORD();
// WORD Default layer width in pixels(ignored)
reader.WORD();
// WORD Default layer height in pixels(ignored)
reader.WORD();
// WORD Blend mode(always 0 for layer set)
// Normal = 0
// Multiply = 1
// Screen = 2
// Overlay = 3
// Darken = 4
// Lighten = 5
// Color Dodge = 6
// Color Burn = 7
// Hard Light = 8
// Soft Light = 9
// Difference = 10
// Exclusion = 11
// Hue = 12
// Saturation = 13
// Color = 14
// Luminosity = 15
// Addition = 16
// Subtract = 17
// Divide = 18
var blendMode = (BlendModes)reader.WORD();
// BYTE Opacity
var opacity = reader.BYTE();
// Note: valid only if file header flags field has bit 1 set
// BYTE[3] For future(set to zero)
reader.BYTES(3);
// STRING Layer name
var name = reader.STRING();
return(new LayerChunk(flags, type, childLevel, blendMode, opacity, name));
}
public static TagsChunk Read(AsepriteStreamReader reader)
{
//WORD Number of tags
var tagCount = reader.WORD();
//BYTE[8] For future(set to zero)
reader.BYTES(8);
//+For each tag
var tags = new Tag[tagCount];
for (int i = 0; i < tagCount; i++)
{
tags[i] = Tag.Read(reader);
}
return(new TagsChunk(tags));
}
public static PaletteEntry Read(AsepriteStreamReader reader, string defaultName)
{
// WORD Entry flags:
// 1 = Has name
bool hasName = reader.FLAG(reader.WORD(), 1);
// BYTE Red(0 - 255)
var r = reader.BYTE();
// BYTE Green(0 - 255)
var g = reader.BYTE();
// BYTE Blue(0 - 255)
var b = reader.BYTE();
// BYTE Alpha(0 - 255)
var a = reader.BYTE();
// +If has name bit in entry flags
// STRING Color name
var name = hasName
? reader.STRING()
: defaultName;
return(new PaletteEntry(r, g, b, a, name));
}
public static CellChunk Read(AsepriteStreamReader reader, ColorDepth colorDepth)
{
// WORD Layer index(see NOTE.2)
var layerIndex = reader.WORD();
// SHORT X position
var xPosition = reader.SHORT();
// SHORT Y position
var yPosition = reader.SHORT();
// BYTE Opacity level
var opacityLevel = reader.BYTE();
// WORD Cel type
var cellType = reader.WORD();
// BYTE[7] For future(set to zero)
reader.BYTES(7);
// +For cel type = 0(Raw Cel)
if (cellType == 0)
{
// WORD Width in pixels
var width = reader.WORD();
// WORD Height in pixels
var height = reader.WORD();
// PIXEL[] Raw pixel data: row by row from top to bottom,
// for each scanline read pixels from left to right.
var depthModifier = 0;
if (colorDepth == ColorDepth.RGBA)
{
depthModifier = 4;
}
else if (colorDepth == ColorDepth.Grayscale)
{
depthModifier = 2;
}
else if (colorDepth == ColorDepth.Indexed)
{
depthModifier = 1;
}
var pixels = reader.BYTES(width * height * depthModifier);
return(new CellChunk(layerIndex, xPosition, yPosition, opacityLevel, cellType,
width, height, pixels));
}
// + For cel type = 1(Linked Cel)
else if (cellType == 1)
{
// WORD Frame position to link with
var linkedFramePosition = reader.WORD();
return(new CellChunk(layerIndex, xPosition, yPosition, opacityLevel, cellType,
linkedFramePosition));
}
// + For cel type = 2(Compressed Image)
else if (cellType == 2)
{
// WORD Width in pixels
var width = reader.WORD();
// WORD Height in pixels
var height = reader.WORD();
// BYTE[] "Raw Cel" data compressed with ZLIB method
var depthModifier = 0;
if (colorDepth == ColorDepth.RGBA)
{
depthModifier = 4;
}
else if (colorDepth == ColorDepth.Grayscale)
{
depthModifier = 2;
}
else if (colorDepth == ColorDepth.Indexed)
{
depthModifier = 1;
}
var count = width * height * depthModifier;
var pixels = new byte[count];
reader.DEFLATE(pixels);
return(new CellChunk(layerIndex, xPosition, yPosition, opacityLevel, cellType, width, height, pixels));
}
else
{
return(new CellChunk(layerIndex, xPosition, yPosition, opacityLevel, cellType));
}
}
public static FrameData Read(AsepriteStreamReader reader, ColorDepth colorDepth)
{
// DWORD Bytes in this frame
var bytesInFrame = reader.DWORD();
// WORD Magic number(always 0xF1FA)
var magicNumber = reader.WORD();
if (magicNumber != 0xF1FA)
{
throw new System.Exception("Invalid Format");
}
// WORD Old field which specifies the number of "chunks"
// in this frame.If this value is 0xFFFF, we might
// have more chunks to read in this frame
// (so we have to use the new field)
var oldNumberOfChunks = reader.WORD();
// WORD Frame duration(in milliseconds)
var frameDuration = reader.WORD();
// BYTE[2] For future(set to zero)
reader.BYTES(2);
// DWORD New field which specifies the number of "chunks"
// in this frame(if this is 0, use the old field)
var newNumberOfChunks = reader.DWORD();
var numberOfChunks = newNumberOfChunks > 0 ? newNumberOfChunks : oldNumberOfChunks;
var chunks = new IChunk[numberOfChunks];
for (int i = 0; i < numberOfChunks; i++)
{
// DWORD Chunk size
var startPos = reader.POS;
var size = reader.DWORD();
// WORD Chunk type
var type = reader.WORD();
// BYTE[] Chunk data
Console.WriteLine($"Reading Chunk Type: {type:X}");
switch (type)
{
case 0x2004:
chunks[i] = LayerChunk.Read(reader);
break;
case 0x2005:
chunks[i] = CellChunk.Read(reader, colorDepth);
break;
case 0x2006:
chunks[i] = CellExtraChunk.Read(reader);
break;
case 0x2018:
chunks[i] = TagsChunk.Read(reader);
break;
case 0x2019:
chunks[i] = PaletteChunk.Read(reader);
break;
case 0x2020:
chunks[i] = UserDataChunk.Read(reader);
break;
case 0x2022:
chunks[i] = SliceChunk.Read(reader);
break;
default:
// ingoring data
reader.BYTES((int)size);
break;
}
reader.POS = startPos + size;
}
return(new FrameData(bytesInFrame, frameDuration, chunks));
}
public static Header Read(AsepriteStreamReader reader)
{
// DWORD File size
var fileSize = reader.DWORD();
// WORD Magic number (0xA5E0)
var magicNumber = reader.WORD();
if (magicNumber != 0xA5E0)
{
throw new System.Exception("Invalid Format");
}
// WORD Frames
var frames = reader.WORD();
// WORD Width in pixels
var width = reader.WORD();
// WORD Height in pixels
var height = reader.WORD();
// WORD Color depth (bits per pixel)
// 32 bpp = RGBA
// 16 bpp = Grayscale
// 8 bpp = Indexed
var colorDepth = (ColorDepth)reader.WORD();
// DWORD Flags:
// 1 = Layer opacity has valid value
var layerOpacityHasValidValue = reader.FLAG(reader.DWORD(), 1);
// WORD Speed (milliseconds between frame, like in FLC files)
// DEPRECATED: You should use the frame duration field
// from each frame header
reader.WORD();
// DWORD Set be 0
reader.DWORD();
// DWORD Set be 0
reader.DWORD();
// BYTE Palette entry (index) which represent transparent color
// in all non-background layers (only for Indexed sprites).
var transparentIndex = reader.BYTE();
// BYTE[3] Ignore these bytes
reader.BYTES(3);
// WORD Number of colors (0 means 256 for old sprites)
reader.WORD();
// BYTE Pixel width (pixel ratio is "pixel width/pixel height").
// If this or pixel height field is zero, pixel ratio is 1:1
var pixelWidth = reader.BYTE();
// BYTE Pixel height
var pixelHeight = reader.BYTE();
byte pixelRatio = 1;
if (pixelHeight > 0 && pixelWidth > 0)
{
pixelRatio = (byte)(pixelWidth / pixelHeight);
}
// SHORT X position of the grid
var xPos = reader.SHORT();
// SHORT Y position of the grid
var yPos = reader.SHORT();
// WORD Grid width (zero if there is no grid, grid size
// is 16x16 on Aseprite by default)
var gridWidth = reader.WORD();
// WORD Grid height (zero if there is no grid)
var gridHeight = reader.WORD();
// BYTE[84] For future (set to zero)
reader.BYTES(84);
return(new Header(
fileSize,
frames,
width,
height,
colorDepth,
layerOpacityHasValidValue,
transparentIndex,
pixelWidth,
pixelHeight,
pixelRatio,
xPos,
yPos,
gridWidth,
gridHeight));
}
