/
photon.go
336 lines (291 loc) · 9.17 KB
/
photon.go
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package photon
import (
"encoding/binary"
"image"
"io"
)
type PhotonFile struct {
PlateX float32
PlateY float32
PlateZ float32
LayerThickness float32
NormalExposureTime float32
BottomExposureTime float32
OffTime float32
BottomLayers uint32
ScreenHeight uint32
ScreenWidth uint32
LightCuringType uint32 // ProjectionType
PreviewImage *image.RGBA
ThumbnailImage *image.RGBA
Layers []Layer
}
type Layer struct {
RawData []byte
AbsoluteHeight float32
ExposureTime float32
PerLayerOffTime float32
}
type binCompatFileHeader struct {
Magic1 uint32 // Always 0x12FD0019
Magic2 uint32 // Always 0x01
PlateX float32
PlateY float32
PlateZ float32
Field_14 uint32
Field_18 uint32
Field_1C uint32
LayerThickness float32
NormalExposureTime float32
BottomExposureTime float32
OffTime float32
BottomLayers uint32
ScreenHeight uint32
ScreenWidth uint32
PreviewHeaderOffset uint32
LayerHeadersOffset uint32
TotalLayers uint32
PreviewThumbnailHeaderOffset uint32
Field_4C uint32
LightCuringType uint32 // ProjectionType
Field_54 uint32
Field_58 uint32
Field_60 uint32
Field_5C uint32
Field_64 uint32
Field_68 uint32
}
type binCompatPreviewHeader struct {
Width uint32
Height uint32
PreviewDataOffset uint32
PreviewDataSize uint32
Field_10 uint64 // Unused, always 0
Field_18 uint64 // Unused, always 0
}
type binCompatLayerHeader struct {
AbsoluteHeight float32
ExposureTime float32
PerLayerOffTime float32 // This is normally set to the file headers OffTime in all layers.
// Most significant bit is seek type
// switch(ImageDataOffset>>31)
// case 0: from start of file (Only seen this one actually being used.)
// case 1: relative (probably...)
ImageDataOffset uint32
ImageDataSize uint32
Field_14 uint64 // Unused, always 0
Field_1C uint64 // Unused, always 0
}
func Decode(rdr io.ReadSeeker) (*PhotonFile, error) {
// Read main file header
var header binCompatFileHeader
err := binary.Read(rdr, binary.LittleEndian, &header)
if err != nil {
return nil, err
}
// Read layers
rdr.Seek(int64(header.LayerHeadersOffset), io.SeekStart)
layerHeaders := make([]binCompatLayerHeader, header.TotalLayers)
err = binary.Read(rdr, binary.LittleEndian, &layerHeaders)
if err != nil {
return nil, err
}
// Read in the preview image data
var previewHeader binCompatPreviewHeader
rdr.Seek(int64(header.PreviewHeaderOffset), io.SeekStart)
err = binary.Read(rdr, binary.LittleEndian, &previewHeader)
if err != nil {
return nil, err
}
previewData := make([]uint16, previewHeader.PreviewDataSize/2)
rdr.Seek(int64(previewHeader.PreviewDataOffset), io.SeekStart)
err = binary.Read(rdr, binary.LittleEndian, &previewData)
if err != nil {
return nil, err
}
previewImg := decodePreview(previewData, previewHeader.Height, previewHeader.Width)
// Read in the thumbnail image data
var thumbnailHeader binCompatPreviewHeader
rdr.Seek(int64(header.PreviewThumbnailHeaderOffset), io.SeekStart)
err = binary.Read(rdr, binary.LittleEndian, &thumbnailHeader)
if err != nil {
return nil, err
}
thumbnailData := make([]uint16, thumbnailHeader.PreviewDataSize/2)
rdr.Seek(int64(thumbnailHeader.PreviewDataOffset), io.SeekStart)
err = binary.Read(rdr, binary.LittleEndian, &thumbnailData)
if err != nil {
return nil, err
}
thumbnailImg := decodePreview(thumbnailData, thumbnailHeader.Height, thumbnailHeader.Width)
var layers []Layer
for _, layer := range layerHeaders {
// Read in the image data
imageData := make([]byte, layer.ImageDataSize)
rdr.Seek(int64(layer.ImageDataOffset), io.SeekStart)
err = binary.Read(rdr, binary.LittleEndian, &imageData)
if err != nil {
return nil, err
}
// Deocode image data
//img := decodeLayerImageData(imageData, header.ScreenHeight, header.ScreenWidth)
layers = append(layers, Layer{
//Image: img,
RawData: imageData,
AbsoluteHeight: layer.AbsoluteHeight,
ExposureTime: layer.ExposureTime,
PerLayerOffTime: layer.PerLayerOffTime,
})
}
return &PhotonFile{
PlateX: header.PlateX,
PlateY: header.PlateY,
PlateZ: header.PlateZ,
LayerThickness: header.LayerThickness,
NormalExposureTime: header.NormalExposureTime,
BottomExposureTime: header.BottomExposureTime,
OffTime: header.OffTime,
BottomLayers: header.BottomLayers,
ScreenHeight: header.ScreenHeight,
ScreenWidth: header.ScreenWidth,
LightCuringType: header.LightCuringType,
PreviewImage: previewImg,
ThumbnailImage: thumbnailImg,
Layers: layers,
}, nil
}
/*
header
previewHeader
previewData
thumbnailHeader
thumbnailData
layer0Header
layer1Header
layer2Header
...
layer9Header
layer0Data
layer1Data
layer2Data
...
layer9Data
*/
// Encodes the data in .photon / .cbddlp file format to the given writer.
func (pf *PhotonFile) EncodeTo(writer io.Writer) error {
err := error(nil)
previewData := U16ToU8Slice(encodePreview(pf.PreviewImage))
thumbnailData := U16ToU8Slice(encodePreview(pf.ThumbnailImage))
/*
previewData, err := ioutil.ReadFile("saved_preview_835x321.bin")
if err != nil {
return err
}
thumbnailData, err := ioutil.ReadFile("saved_thumbnail_199x72.bin")
if err != nil {
return err
}
*/
var layerDatas [][]byte
for i := 0; i < len(pf.Layers); i++ {
layerDatas = append(layerDatas, pf.Layers[i].RawData)
}
// Pre-calculate offsets so that we don't have to fixup the offset fields later.
pos := 0
pos += binary.Size(binCompatFileHeader{})
// Preview offsets
previewHeaderOffset := pos
pos += binary.Size(binCompatPreviewHeader{})
previewDataOffset := pos
pos += len(previewData)
// Thumbnail offsets
thumbnailHeaderOffset := pos
pos += binary.Size(binCompatPreviewHeader{})
thumbnailDataOffset := pos
pos += len(thumbnailData)
// Layer headers offsets
var layerHeaderOffsets []int
for i := 0; i < len(pf.Layers); i++ {
layerHeaderOffsets = append(layerHeaderOffsets, pos)
pos += binary.Size(binCompatLayerHeader{})
}
// Layer data offsets
var layerDataOffsets []int
for i := 0; i < len(pf.Layers); i++ {
layerDataOffsets = append(layerDataOffsets, pos)
pos += len(layerDatas[i])
}
// Start forming and writing the file from here
header := binCompatFileHeader{
Magic1: 0x12FD0019,
Magic2: 0x01,
PlateX: pf.PlateX,
PlateY: pf.PlateY,
PlateZ: pf.PlateZ,
LayerThickness: pf.LayerThickness,
NormalExposureTime: pf.NormalExposureTime,
BottomExposureTime: pf.BottomExposureTime,
OffTime: pf.OffTime,
BottomLayers: pf.BottomLayers,
ScreenHeight: pf.ScreenHeight,
ScreenWidth: pf.ScreenWidth,
PreviewHeaderOffset: uint32(previewHeaderOffset),
LayerHeadersOffset: uint32(layerHeaderOffsets[0]),
TotalLayers: uint32(len(pf.Layers)),
PreviewThumbnailHeaderOffset: uint32(thumbnailHeaderOffset),
LightCuringType: pf.LightCuringType,
}
previewHeader := binCompatPreviewHeader{
Width:/*835, // */ uint32(pf.PreviewImage.Bounds().Max.X),
Height:/*321, //*/ uint32(pf.PreviewImage.Bounds().Max.Y),
PreviewDataOffset: uint32(previewDataOffset),
PreviewDataSize: uint32(len(previewData)),
}
thumbnailHeader := binCompatPreviewHeader{
Width:/*199, //*/ uint32(pf.ThumbnailImage.Bounds().Max.X),
Height:/*72, //*/ uint32(pf.ThumbnailImage.Bounds().Max.Y),
PreviewDataOffset: uint32(thumbnailDataOffset),
PreviewDataSize: uint32(len(thumbnailData)),
}
var layerHeaders []binCompatLayerHeader
for idx, l := range pf.Layers {
layerHeaders = append(layerHeaders, binCompatLayerHeader{
AbsoluteHeight: l.AbsoluteHeight,
ExposureTime: l.ExposureTime,
PerLayerOffTime: l.PerLayerOffTime,
ImageDataOffset: uint32(layerDataOffsets[idx]),
ImageDataSize: uint32(len(layerDatas[idx])),
})
}
err = binary.Write(writer, binary.LittleEndian, header)
if err != nil {
return err
}
err = binary.Write(writer, binary.LittleEndian, previewHeader)
if err != nil {
return err
}
err = binary.Write(writer, binary.LittleEndian, previewData)
if err != nil {
return err
}
err = binary.Write(writer, binary.LittleEndian, thumbnailHeader)
if err != nil {
return err
}
err = binary.Write(writer, binary.LittleEndian, thumbnailData)
if err != nil {
return err
}
err = binary.Write(writer, binary.LittleEndian, layerHeaders)
if err != nil {
return err
}
for _, s := range layerDatas {
err = binary.Write(writer, binary.LittleEndian, s)
if err != nil {
return err
}
}
return nil
}