[aandrejevic] 59690: [NTVDM] Optimize screen clearing by implementing it as a helper function in vga.c.

Author: aandrejevic
Date: Sat Aug 10 19:30:14 2013
New Revision: 59690

URL: http://svn.reactos.org/svn/reactos?rev=59690&view=rev
Log:
[NTVDM]
Optimize screen clearing by implementing it as a helper function in vga.c.

Modified:
    branches/ntvdm/subsystems/ntvdm/bios.c
    branches/ntvdm/subsystems/ntvdm/vga.c
    branches/ntvdm/subsystems/ntvdm/vga.h

Modified: branches/ntvdm/subsystems/ntvdm/bios.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/bios.c?re...
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/bios.c	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/bios.c	[iso-8859-1] Sat Aug 10 19:30:14 2013
@@ -255,31 +255,6 @@
     }
 }

-static VOID BiosClearScreen(VOID)
-{
-    INT i;
-    BYTE PlaneMask;
-
-    /* Save the plane write register */
-    VgaWritePort(VGA_SEQ_INDEX, VGA_SEQ_MASK_REG);
-    PlaneMask = VgaReadPort(VGA_SEQ_DATA);
-
-    /* Write to all planes */
-    VgaWritePort(VGA_SEQ_DATA, 0x0F);
-
-    /* Clear the screen */
-    for (i = VgaGetVideoBaseAddress();
-         i < VgaGetVideoLimitAddress();
-         i += sizeof(DWORD))
-    {
-        DWORD Zero = 0;
-        VgaWriteMemory(i, (LPVOID)&Zero, sizeof(DWORD));
-    }
-
-    /* Restore the plane write register */
-    VgaWritePort(VGA_SEQ_DATA, PlaneMask);
-}
-
 /* PUBLIC FUNCTIONS ***********************************************************/

BYTE BiosGetVideoMode(VOID)
@@ -654,7 +629,7 @@
         case 0x00:
         {
             BiosSetVideoMode(LOBYTE(Eax));
-            BiosClearScreen();
+            VgaClearMemory();

break;
         }

Modified: branches/ntvdm/subsystems/ntvdm/vga.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/vga.c?rev...
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/vga.c	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/vga.c	[iso-8859-1] Sat Aug 10 19:30:14 2013
@@ -1021,6 +1021,11 @@
     }
 }

+VOID VgaClearMemory(VOID)
+{
+    ZeroMemory(VgaMemory, sizeof(VgaMemory));
+}
+
 VOID VgaInitialize(HANDLE TextHandle)
 {
     INT i, j;

Modified: branches/ntvdm/subsystems/ntvdm/vga.h
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/vga.h?rev...
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/vga.h	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/vga.h	[iso-8859-1] Sat Aug 10 19:30:14 2013
@@ -193,6 +193,7 @@
 VOID VgaWriteMemory(DWORD Address, LPBYTE Buffer, DWORD Size);
 BYTE VgaReadPort(WORD Port);
 VOID VgaWritePort(WORD Port, BYTE Data);
+VOID VgaClearMemory(VOID);
 VOID VgaInitialize(HANDLE TextHandle);

#endif // _VGA_H_