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FillMemory::
; Fill bc bytes at hl with a.
push de
ld d, a
.loop
ld a, d
ld [hli], a
dec bc
ld a, b
or c
jr nz, .loop
pop de
ret
UncompressSpriteFromDE::
; Decompress pic at a:de.
ld hl, wSpriteInputPtr
ld [hl], e
inc hl
ld [hl], d
jp UncompressSpriteData
SaveScreenTilesToBuffer2::
hlcoord 0, 0
ld de, wTileMapBackup2
ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
call CopyData
ret
LoadScreenTilesFromBuffer2::
call LoadScreenTilesFromBuffer2DisableBGTransfer
ld a, 1
ldh [hAutoBGTransferEnabled], a
ret
; loads screen tiles stored in wTileMapBackup2 but leaves hAutoBGTransferEnabled disabled
LoadScreenTilesFromBuffer2DisableBGTransfer::
xor a
ldh [hAutoBGTransferEnabled], a
ld hl, wTileMapBackup2
decoord 0, 0
ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
call CopyData
ret
SaveScreenTilesToBuffer1::
hlcoord 0, 0
ld de, wTileMapBackup
ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
jp CopyData
LoadScreenTilesFromBuffer1::
xor a
ldh [hAutoBGTransferEnabled], a
ld hl, wTileMapBackup
decoord 0, 0
ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
call CopyData
ld a, 1
ldh [hAutoBGTransferEnabled], a
ret
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