limage - xcf/paths.go

     1  package xcf
     2  
     3  import "errors"
     4  
     5  type paths struct {
     6  	aIndex uint32
     7  	paths  []path
     8  }
     9  
    10  type path struct {
    11  	name   string
    12  	linked bool
    13  	//state   byte
    14  	closed bool
    15  	//version uint32
    16  	tattoo uint32
    17  	points []pathPoint
    18  }
    19  
    20  type pathPoint struct {
    21  	control bool
    22  	x, y    float64
    23  }
    24  
    25  func (d *reader) ReadPaths() paths {
    26  	var p paths
    27  	p.aIndex = d.ReadUint32()
    28  	n := d.ReadUint32()
    29  	p.paths = make([]path, n)
    30  	for i := uint32(0); i < n; i++ {
    31  		p.paths[i].name = d.ReadString()
    32  		p.paths[i].linked = d.ReadBoolProperty()
    33  		state := d.ReadUint8()
    34  		p.paths[i].closed = d.ReadBoolProperty()
    35  		if p.paths[i].closed {
    36  			if state != 4 {
    37  				d.SetError(ErrInconsistantClosedState)
    38  				return p
    39  			}
    40  		} else {
    41  			if state != 2 {
    42  				d.SetError(ErrInconsistantClosedState)
    43  				return p
    44  			}
    45  		}
    46  		np := d.ReadUint32()
    47  		v := d.ReadUint32()
    48  		if v < 1 || v > 3 {
    49  			d.SetError(ErrUnknownPathsVersion)
    50  			return p
    51  		}
    52  		if v == 2 || v == 3 {
    53  			d.SkipUint32()
    54  		}
    55  		if v == 3 {
    56  			p.paths[i].tattoo = d.ReadUint32()
    57  		}
    58  		p.paths[i].points = make([]pathPoint, np)
    59  		for j := uint32(0); j < np; j++ {
    60  			p.paths[i].points[j].control = d.ReadBoolProperty()
    61  			if v == 1 {
    62  				p.paths[i].points[j].x = float64(d.ReadInt32())
    63  				p.paths[i].points[j].y = float64(d.ReadInt32())
    64  			} else {
    65  				p.paths[i].points[j].x = float64(d.ReadFloat32())
    66  				p.paths[i].points[j].y = float64(d.ReadFloat32())
    67  			}
    68  		}
    69  	}
    70  	return p
    71  }
    72  
    73  // Errors
    74  var (
    75  	ErrInconsistantClosedState = errors.New("inconsistant closed state")
    76  	ErrUnknownPathsVersion     = errors.New("unknown paths version")
    77  )
    78