Remove now-unnecessary shift in draw_rect

Document new requirement that rectangle height is at least 1
2023-03-19 17:19:18 +02:00 · 2023-03-19 17:18:55 +02:00
1 changed files with 2 additions and 3 deletions
--- a/ponydos.asm
+++ b/ponydos.asm
@ -129,7 +129,7 @@ mainloop:
 ; in:
 ;  bx = width of input buffer
 ;  cx = width of rectangle
-;  dx = height of rectangle
+;  dx = height of rectangle (must be at least 1)
 ;  ds:si = beginning of source data
 ;  di = X
 ;  bp = Y
@ -153,12 +153,11 @@ draw_rect:

 	; Convert widths to bytes
 	shl bx, 1
-	shl cx, 1

 	.loop:
 		; Copy a row
 		pusha
-		rep movsb
+		rep movsw
 		popa

 		; Move to the next row in the input buffer
Author	SHA1	Message	Date
Juhani Krekelä	ce07a23355	Remove now-unnecessary shift in draw_rect	2023-03-19 17:19:18 +02:00
Juhani Krekelä	6e4974de3f	Document new requirement that rectangle height is at least 1	2023-03-19 17:18:55 +02:00