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 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));
}
