fix(ppm): respect hidden layers when rendering frames

Read both layer-visibility flags and omit disabled layers from rendered images.

Hatenatools/PPM.py

@@ -155,6 +155,7 @@ class PPM:
 		self.RawThumbnail = None
 		self.SoundData = None
 		self.forced_speed = forced_speed
+		self.LayerVisibility = (True, True)
 	def ReadFile(self, path, DecodeThumbnail=False, ReadFrames=True, ReadSound=False):#Load: (thumbnail, frames, sound)
 		f = open(path, "rb")
 		ret = self.Read(f.read(), DecodeThumbnail, ReadFrames, ReadSound)
@@ -199,6 +200,7 @@ class PPM:
 		
 		#read the animation sequence header:
 		self.Looped = data[0x06A6] >> 1 & 0x01 == 1#Unverified?
+		self.LayerVisibility = (not bool(data[0x06A6] & 0x10), not bool(data[0x06A6] & 0x20))
 		AnimationOffset = 0x6a8 + AscDec(data[0x6a0:0x6a4], True)
 		FrameOffsets = [AnimationOffset + AscDec(data[0x06a8+i*4:0x06a8+i*4+4], True) for i in range(self.FrameCount)]
 		
@@ -269,8 +271,8 @@ class PPM:
 		
 		out = np.zeros((256, 192), dtype=">u4")
 		out[:] = Palette[0]
-		out[Frame[1]] = Color2
-		out[Frame[0]] = Color1
+		if self.LayerVisibility[1]: out[Frame[1]] = Color2
+		if self.LayerVisibility[0]: out[Frame[0]] = Color1
 		
 		return out
 	def GetThumbnail(self, force=False):