From 3fa62291eb9bf1d5a590a375e3fefbd4924b881c Mon Sep 17 00:00:00 2001
From: Joshua Bell <inexorabletash@gmail.com>
Date: Thu, 10 Oct 2024 19:38:17 -0700
Subject: [PATCH] MGTK: Shave 15 bytes by optimizing InflateRect

No functional changes.
---
 mgtk/mgtk.s | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/mgtk/mgtk.s b/mgtk/mgtk.s
index d53de922..eb05d7f6 100644
--- a/mgtk/mgtk.s
+++ b/mgtk/mgtk.s
@@ -10621,13 +10621,34 @@ ydelta     .word
         END_PARAM_BLOCK
 
         ldy     #0
-        sub16in (params::rect),y, params::xdelta, (params::rect),y
+
+        ;; Subtract from x1 and y1; Y is 0...3
+        ldx     #2
+:       sec
+        lda     (params::rect),y
+        sbc     params::xdelta,y
+        sta     (params::rect),y
         iny
-        sub16in (params::rect),y, params::ydelta, (params::rect),y
+        lda     (params::rect),y
+        sbc     params::xdelta,y
+        sta     (params::rect),y
         iny
-        add16in (params::rect),y, params::xdelta, (params::rect),y
+        dex
+        bne     :-
+
+        ;; Add to x1 and y1; Y is 4...7
+        ldx     #2
+:       clc
+        lda     (params::rect),y
+        adc     params::xdelta - 4,y
+        sta     (params::rect),y
+        iny
+        lda     (params::rect),y
+        adc     params::xdelta - 4,y
+        sta     (params::rect),y
         iny
-        add16in (params::rect),y, params::ydelta, (params::rect),y
+        dex
+        bne     :-
 
         rts
 .endproc ; InflateRectImpl