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tileset.go
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/
tileset.go
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package transform
import (
"image"
"image/color"
"io"
"github.com/SnareChops/aseprite-loader/ase"
"github.com/SnareChops/aseprite-loader/internal"
"github.com/SnareChops/aseprite-loader/trace"
)
func transformTileset(in io.Reader, out io.Writer) (data internal.Tileset, err error) {
trace.Log("transformTileset")
tileset, err := transform[ase.TilesetChunk](in, out)
if err != nil {
return
}
var name ase.String
name, err = transformString(in, out)
if err != nil {
return
}
data.ID = tileset.ID
data.Name = name.Value
data.Flags = tileset.Flags
data.Width = tileset.Width
data.Height = tileset.Height
data.Index = tileset.Index
if tileset.Flags&0x1 == 0x1 {
var external ase.TilesetExternalData
external, err = transform[ase.TilesetExternalData](in, out)
if err != nil {
return
}
data.ExternalID = external.ID
data.ExternalTilesetID = external.TilesetID
}
if tileset.Flags&0x2 == 0x2 {
var tiles []image.Image
tiles, err = transformTilesetCompressedData(in, out, int(tileset.Width), int(tileset.Height))
if err != nil {
return
}
for _, tile := range tiles {
data.Tiles = append(data.Tiles, internal.Tile{Image: tile})
}
}
return
}
func transformTilesetCompressedData(in io.Reader, out io.Writer, width int, height int) (data []image.Image, err error) {
trace.Log("transformTilesetCompressedData")
var length uint32
length, err = transform[uint32](in, out)
if err != nil {
return
}
var compressed []byte
compressed, err = transformBytes(in, out, length)
if err != nil {
return
}
var pix []byte
pix, err = decompress(compressed)
if err != nil {
return
}
for t := 0; t < len(pix); t += width * height * 4 {
img := image.NewNRGBA(image.Rect(0, 0, width, height))
for i := 0; i < width*height*4; i += 4 {
c := color.NRGBA{pix[t+i], pix[t+i+1], pix[t+i+2], pix[t+i+3]}
img.Set((i/4)%width, (i/4)/width, c)
}
data = append(data, img)
}
return
}