Changeset 44 in xtideuniversalbios for trunk/Assembly_Library/Src/Display/DisplayContext.asm

Timestamp:

Sep 27, 2010, 7:23:36 PM (14 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Spaces can now be generated before format specifier when printing formatted string.
Background character and attribute can now be easily specified before compiling.

File:

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

trunk/Assembly_Library/Src/Display/DisplayContext.asm

@@ -2 +2 @@
 ; Project name  :   Assembly Library
 ; Created date  :   25.6.2010
-; Last update   :   13.8.2010
+; Last update   :   27.9.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for managing display context.
@@ -23 +23 @@
     mov     WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT
     mov     WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], CURSOR_NORMAL
-    mov     BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], MONO_NORMAL
+    mov     BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE
+    mov     BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
 
     xor     ax, ax
@@ -152 +153 @@
 
 ;--------------------------------------------------------------------
-; DisplayContext_SetCharacterOutputFunctionFromAX
+; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInDL
 ;   Parameters:
 ;       AX:     Offset to character output function
-;       DS:     BDA segment (zero)
-;   Returns:
-;       Nothing
-;   Corrupts registers:
-;       Nothing
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-DisplayContext_SetCharacterOutputFunctionFromAX:
+;       DL:     Attribute Flag
+;       DS:     BDA segment (zero)
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+ALIGN JUMP_ALIGN
+DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInDL:
     mov     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
+    and     BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
+    mov     al, dl
+    and     al, FLG_CONTEXT_ATTRIBUTES
+    or      [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], al
     ret
 
@@ -211 +217 @@
     mov     dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
     ret
+
+
+;--------------------------------------------------------------------
+; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
+;   Parameters:
+;       AX:     Offset in bytes from some character to another
+;       DS:     BDA segment (zero)
+;   Returns:
+;       AX:     Offset in characters from some character to another
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------   
+ALIGN JUMP_ALIGN
+DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
+    test    BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
+    jz      SHORT ReturnOffsetInAX
+    sar     ax, 1       ; BYTE count to WORD count
+    ret
+
+;--------------------------------------------------------------------
+; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
+;   Parameters:
+;       AX:     Offset in characters from some character to another
+;       DS:     BDA segment (zero)
+;   Returns:
+;       AX:     Offset in bytes from some character to another
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------   
+ALIGN JUMP_ALIGN
+DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
+    test    BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
+    jz      SHORT ReturnOffsetInAX
+    sal     ax, 1       ; WORD count to BYTE count
+ALIGN JUMP_ALIGN, ret
+ReturnOffsetInAX:
+    ret