public bool extract()
{
while (true)
{
if (!this.readLength(out this.length))
{
// Debug.WriteLine("Failed in reading length: offsetByte = " + this.offsetBytesCompressed + ", offsetBits = " + this.offsetBitsCompressed);
return(false);
}
// Debug.WriteLine("length=" + this.length.ToString());
while (this.width <= this.posCurrent.x + this.length)
{
this.setLineSegment(this.posCurrent, this.width - this.posCurrent.x, this.segments);
this.length -= this.width - this.posCurrent.x;
this.posCurrent.x = 0;
this.posCurrent.y++;
if (this.height <= this.posCurrent.y)
{
return(true);
}
this.segments = this.scanSegmentsActiveNextLine();
}
if (0 < this.length)
{
if (0 <= this.posCurrent.x)
{
this.setLineSegment(this.posCurrent, this.length, this.segments);
}
this.posCurrent.x += this.length;
}
if (!this.readColor(out this.colorCurrent))
{
Debug.WriteLine("Failed in reading color: offsetByte = " + this.offsetBytesCompressed + ", offsetBits = " + this.offsetBitsCompressed);
return(false);
}
// Debug.WriteLine("color=" + this.getStrColor(this.colorCurrent));
YanagisawaPicLightning lightning = null;
if (!this.readLightning(this.posCurrent, out lightning))
{
Debug.WriteLine("Failed in reading lightning: offsetByte = " + this.offsetBytesCompressed + ", offsetBits = " + this.offsetBitsCompressed);
return(false);
}
if (lightning != null)
{
lightning.color = this.colorCurrent.CloneDeep();
// this.drawLightning(lightning); // debug
this.lightnings.Add(lightning);
// Debug.WriteLine("lightning size=" + lightning.numOffsets.ToString());
}
else
{
// Debug.WriteLine("lightning none");
}
}
}
private void drawLightning(YanagisawaPicLightning lightning)
{
var pos = lightning.posStart.CloneDeep();
this.setPixel(pos, lightning.color);
var numOffsets = lightning.numOffsets;
for (var index = 0; index < numOffsets; index++)
{
pos.x += lightning.offsetsX[index];
pos.y++;
this.setPixel(pos, lightning.color);
}
}
private bool readLightning(Pos2 pos, out YanagisawaPicLightning lightning)
{
lightning = new YanagisawaPicLightning(pos);
long value = 0;
if (!this.readBitsCompressed(1, out value))
{
return(false);
}
if (value == 0)
{
return(true);
}
bool needToExit = false;
while (!needToExit)
{
if (!this.readBitsCompressed(2, out value))
{
return(false);
}
var next = value;
switch (next)
{
case 0x0:
if (!this.readBitsCompressed(1, out value))
{
return(false);
}
if (value == 1)
{
if (!this.readBitsCompressed(1, out value))
{
return(false);
}
var next2 = value;
lightning.addOffset(next2 == 0 ? -2 : 2);
}
else
{
needToExit = true;
}
break;
case 0x1:
lightning.addOffset(-1);
break;
case 0x2:
lightning.addOffset(0);
break;
case 0x3:
lightning.addOffset(1);
break;
}
}
return(true);
}