putfs

PutFS:
; read the font from flash to RAM
; need to add 3*A to the fontpointer
  ld hl,(FontPointer)
  ld b,0
  ld c,a
  add hl,bc
  add hl,bc
  adc hl,bc     ;add hl,bc won't set the right flags, so use adc
  ld a,(font_ptr_page)
  jp p,+_
  or a
  jr z,+_
  set 6,h
  res 7,h
  inc a
_:
  ld c,3
  ld de,$8005
  call readarc

; get the text position and update it
  ld hl,(textRow)
;  ld b,0 ;B is already 0 from the ReadArc routine
  ld a,h
  cp 24
  ld a,l
  jr c,+_
  ld h,b
  add a,6
_:
  cp 3Bh
  jr c,+_
  sub 3Ch
  jr nc,+_
  add a,6
_:
  ld l,a
; need to advance the x-coord by 1
  inc h
  ld (textRow),hl
  dec h
  ;want A*12+H/2+(gbuf_temp), and we know A < 64
  add a,a
  add a,a
  ;now A*3+(gbuf_temp)+H/2
  ld c,a
  ld a,h
  ld hl,(gbuf_temp)
  add hl,bc
  add hl,bc
  add hl,bc
  ld c,a
  srl c
  add hl,bc
  rra
  ld e,4    ; now DE points to the byte before the char data
  jr nc,put_left
put_right:
  ld c,$0F
  call put_right2
  call put_right2
put_right2:
; read in the byte
  inc de
  ld a,(de)

; check if it needs to be inverted
  bit InvertTextFlag,(iy+UserFlags)
  jr z,$+3
  cpl
  ld b,a      ; back up the byte
  call shift_put_lr
  ld a,b      ;restore the byte
  jr put_lr

put_left:
  ld c,$F0
  call put_left2
  call put_left2
put_left2:
; read in the byte
  inc de
  ld a,(de)

; check if it needs to be inverted
  bit InvertTextFlag,(iy+UserFlags)
  jr z,$+3
  cpl

  ld b,a      ; back up the byte
  call put_lr
  ld a,b      ;restore the byte

shift_put_lr:
; rotate the nibbles
  rrca
  rrca
  rrca
  rrca
put_lr:
; mask the byte
  and c

; OR it to the screen
  or (hl)
  ld (hl),a

; advance the gbuf ptr
  ld a,l
  add a,12
  ld l,a
  ret nc
  inc h
  ret