Changeset 67 in xtideuniversalbios for trunk/Assembly_Library/Src/Display/DisplayPrint.asm

Timestamp:

Dec 9, 2010, 5:14:25 PM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to Assembly Library:

• Forgot to update SI on new File Read and Write functions.
• Screen clearing function now accepts any character and attribute.
• Menu library now accepts CR,LF combination as line feed. Previously only LF,CR worked properly.

File:

• trunk/Assembly_Library/Src/Display/DisplayPrint.asm (modified) (3 diffs)

trunk/Assembly_Library/Src/Display/DisplayPrint.asm

@@ -2 +2 @@
 ; Project name  :   Assembly Library
 ; Created date  :   26.6.2010
-; Last update   :   11.10.2010
+; Last update   :   7.12.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for display output.
@@ -222 +222 @@
 
 ;--------------------------------------------------------------------
-; DisplayPrint_ClearScreen
-;   Parameters:
+; DisplayPrint_ClearScreenWithCharInALandAttributeInAH
+;   Parameters:
+;       AL:     Character to clear with
+;       AH:     Attribute to clear with
 ;       DS:     BDA segment (zero)
 ;       ES:DI:  Ptr to cursor location in video RAM
@@ -232 +234 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-DisplayPrint_ClearScreen:
+DisplayPrint_ClearScreenWithCharInALandAttributeInAH:
     push    di
+    push    cx
+
+    xchg    cx, ax
     xor     ax, ax
-    call    DisplayCursor_SetCoordinatesFromAX
+    call    DisplayCursor_SetCoordinatesFromAX      ; Updates DI
     call    DisplayPage_GetColumnsToALandRowsToAH
-    call    DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
+    mul     ah      ; AX = AL*AH = Characters on screen
+    xchg    cx, ax  ; AX = Char+Attr, CX = WORDs to store
+    rep stosw
+
+    pop     cx
     pop     di
     mov     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di