From cda44f292c3bb2264bcfd28d85eb4836a9a7fc4b Mon Sep 17 00:00:00 2001
From: hugova <hugova@kth.se>
Date: Thu, 17 Jul 2025 13:53:56 +0200
Subject: [PATCH] Reduses one CMP instruction in line_up_inv

---
 wip-hugo/routines/line/line_up_inv.s | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/wip-hugo/routines/line/line_up_inv.s b/wip-hugo/routines/line/line_up_inv.s
index 63e1a84..e8929fc 100644
--- a/wip-hugo/routines/line/line_up_inv.s
+++ b/wip-hugo/routines/line/line_up_inv.s
@@ -52,6 +52,8 @@ selfmod:
 end_selfmod:
         JSR pixel_calc ;;only used first pixel. after this relative position is abused
         STA byte_to_paint
+        INY
+        Sub_16 btp_mem_pos, btp_mem_pos + 1, #$01, #$00 ;; Y has always a offset of at least 1
         ;LDY #$00
         LDX dy
 for_y:
@@ -60,11 +62,10 @@ for_y:
         STA (btp_mem_pos), Y
 decrement_y_pos:
         DEY
-        CPY #$ff
         BNE decrement_y_pos_end
 move_8px_up:
-        LDY #$07
-        Sub_16 btp_mem_pos, btp_mem_pos + 1,#$40 , #$01, !
+        LDY #$08
+        Sub_16 btp_mem_pos, btp_mem_pos + 1,#$3F , #$01, !
 decrement_y_pos_end:
         DEX
         BEQ end