# HG changeset patch
# User Laurens Holst <laurens@grauw.nl>
# Date 1595001261 -7200
#      Fri Jul 17 17:54:21 2020 +0200
# Node ID 022a67e61a351186020e3040d6937e5cfd9bf750
# Parent  b17c13dac3567c7e8aa26abbc8cdbd8259446d97
MapView: Manipulate e register directly instead of going through a.

A bit slower on 4bpp, but a bit faster on 8bpp, and no need to preserve a.

diff --git a/src/MapView.asm b/src/MapView.asm
--- a/src/MapView.asm
+++ b/src/MapView.asm
@@ -544,49 +544,49 @@
 ; de = VRAM destination (14-bit | 4000H)
 ; hl = tile pixels
 MapView_DrawRowTile_M: MACRO ?pixels
-	ld a,e
-	MapView_DrawRowTileLine_M ?pixels, a, d
+	MapView_DrawRowTileLine_M ?pixels
 	IF Video_X_BYTE = 2
-	add a,80H
+	set 7,e
 	ELSE
 	inc d
 	ENDIF
-	MapView_DrawRowTileLine_M ?pixels, a, d
+	MapView_DrawRowTileLine_M ?pixels
 	IF Video_X_BYTE = 2
-	add a,80H
+	res 7,e
 	ENDIF
 	inc d
-	MapView_DrawRowTileLine_M ?pixels, a, d
+	MapView_DrawRowTileLine_M ?pixels
 	IF Video_X_BYTE = 2
-	add a,80H
+	set 7,e
 	ELSE
 	inc d
 	ENDIF
-	MapView_DrawRowTileLine_M ?pixels, a, d
-	dec d
-	IF Video_X_BYTE = 2
-	add a,80H + ?pixels / Video_X_BYTE
-	ELSE
+	MapView_DrawRowTileLine_M ?pixels
+	IF Video_X_BYTE = 1
 	dec d
 	dec d
-	add a,?pixels / Video_X_BYTE
 	ENDIF
+	dec d
+	ld a,e
+	add a,(-100H + ?pixels) / Video_X_BYTE
 	ld e,a
 	ENDM
 
 ; c = VDP port 0
 ; hl = tile pixels
-MapView_DrawRowTileLine_M: MACRO ?pixels, ?vramLSB, ?vramMSB
+MapView_DrawRowTileLine_M: MACRO ?pixels
 	inc c
 	di
-	out (c),?vramLSB
+	out (c),e
 	ei
-	out (c),?vramMSB
+	out (c),d
 	dec c
 	REPT ?pixels / Video_X_BYTE
 	outi
 	ENDM
-	REPT (16 - ?pixels) / Video_X_BYTE
-	inc l
+	IF ?pixels != 16
+	ld a,l
+	add a,(16 - ?pixels) / Video_X_BYTE
+	ld l,a
+	ENDIF
 	ENDM
-	ENDM