Don't pack titles that have animations (#435)

bin/packhgrfile.py

@@ -8,12 +8,19 @@ i = open(infile,"rb")
 filedata = i.read()
 i.close
 
-outdata = bytearray(filedata[0:7680])
+# If the file has a JMP in the last screen hole, the
+# game has an animated title, skip packing and copy
+# the file as is instead.
+if(len(filedata) >= 8192 and filedata[8189] == 0x4c):
+  print (infile, "has animation, not packing")
+  outdata = bytearray(filedata[0:8192])
+else:
+  outdata = bytearray(filedata[0:7680])
 
-for h in range(60):
-  oh = h*128+120
-  ih = h*8+7680+(int(h/15)*8)
-  outdata[oh:oh+8] = filedata[ih:ih+8]
+  for h in range(60):
+    oh = h*128+120
+    ih = h*8+7680+(int(h/15)*8)
+    outdata[oh:oh+8] = filedata[ih:ih+8]
 
 o = open(outfile,"wb")
 o.write(outdata)

src/ui.offscreen.a

@@ -100,14 +100,24 @@ LoadGameTitleOffscreen
          jsr   ForceHGRMode
          jsr   GetOffscreenAddress
          sta   @addrhi
+
+         eor   #$1F
+         sta   @poke+2
+         sta   @peek+2               
+@poke    sta   $3FFD                 ; SMC - clear screen hole before load
+
          jsr   LoadFile
          !word kHGRTitleDirectory
 @fname   !word $FDFD                 ; SMC
          !byte $00
 @addrhi  !byte $FD                   ; SMC
 	 
+@peek    lda   $3FFD                 ; SMC
+         cmp   #$4C                  ; Check if screen hole now contains a JMP
+         beq   +                     ; if so, file was not packed, so skip unpack
          jsr   UnpackHGRTitle
-         rts
++        rts
+
 @dhgr
          jsr   BlankDHGR
          +LD16 @fname