Changeset 101 in xtideuniversalbios for trunk/Assembly_Library/Src/Display/DisplayCursor.asm

Timestamp:

Jan 31, 2011, 7:03:22 PM (14 years ago)

Author:

Tomi Tilli

google:author:

aitotat

Message:

Changes to Assembly Library:

• Some minor size optimizations to Display Library.

File:

• trunk/Assembly_Library/Src/Display/DisplayCursor.asm (modified) (4 diffs)

trunk/Assembly_Library/Src/Display/DisplayCursor.asm

@@ -1 @@
-; File name     :   DisplayCursor.asm
 ; Project name  :   Assembly Library
-; Created date  :   26.6.2010
-; Last update   :   15.7.2010
-; Author        :   Tomi Tilli
 ; Description   :   Functions for managing display cursor.
 
@@ -39 +35 @@
 DisplayCursor_SetCoordinatesFromAX:
     xchg    dx, ax
-    call    .ConvertOffsetToAXfromCoordinatesInDX
-    add     ax, [VIDEO_BDA.wPageOffset]             ; AX = Video RAM offset
+    mov     ax, [VIDEO_BDA.wColumns]        ; Column count, 40 or 80
+    mul     dh                              ; AX = Column count * row index
+    xor     dh, dh
+    add     ax, dx                          ; Add column offset
+    shl     ax, 1                           ; Convert to WORD offset
+    add     ax, [VIDEO_BDA.wPageOffset]     ; AX = Video RAM offset
     mov     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
     xchg    di, ax
-    ret
-
-;--------------------------------------------------------------------
-; .ConvertOffsetToAXfromCoordinatesInDX
-;   Parameters:
-;       DL:     Cursor column (X-coordinate)
-;       DH:     Cursor row (Y-coordinate)
-;       DS:     BDA segment (zero)
-;   Returns:
-;       AX:     Offset to cursor location in selected page
-;   Corrupts registers:
-;       Nothing
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-.ConvertOffsetToAXfromCoordinatesInDX:
-    mov     ax, [VIDEO_BDA.wColumns]        ; Column count, 40 or 80
-    mul     dh                              ; AX = Column count * row index
-    add     al, dl                          ; Add column offset
-    adc     ah, 0
-    shl     ax, 1                           ; Convert to WORD offset
     ret
 
@@ -145 +125 @@
     int     BIOS_VIDEO_INTERRUPT_10h
     pop     cx
-ALIGN JUMP_ALIGN, ret
 .Return:
     ret
@@ -175 +154 @@
 ;       AX, DX
 ;--------------------------------------------------------------------
-;ALIGN JUMP_ALIGN
 .SetHardwareCursorCoordinatesFromAX:
     push    bx