Changeset 11 for trunk/Forms/UFormMain.pas

Timestamp:

Aug 29, 2016, 6:09:30 PM (8 years ago)

Author:

chronos

Message:

• Modified: Slightly optimizied screen drawing.

File:

• trunk/Forms/UFormMain.pas (modified) (2 diffs)

trunk/Forms/UFormMain.pas

@@ -178 +178 @@
 var
   X, Y: Integer;
+  DX, DY: Integer;
   Bitmap: TBitmap;
+  P, PR: PByte;
 begin
   try
@@ -186 +188 @@
 
     if Assigned(VideoDevice.VideoMemory) then begin
-      for Y := 0 to VideoDevice.VideoMode.Size.Y - 1 do
-      for X := 0 to VideoDevice.VideoMode.Size.X - 1 do begin
-        Bitmap.Canvas.Pixels[X, Y] := PInteger(VideoDevice.VideoMemory + X * VideoDevice.VideoMode.GetBytesPerPixel +
-        Y * VideoDevice.VideoMode.GetBytesPerLine)^ and $ffffff;
+      DX := VideoDevice.VideoMode.GetBytesPerPixel;
+      DY := VideoDevice.VideoMode.GetBytesPerLine;
+      P := VideoDevice.VideoMemory;
+      for Y := 0 to VideoDevice.VideoMode.Size.Y - 1 do begin
+        PR := P;
+        for X := 0 to VideoDevice.VideoMode.Size.X - 1 do begin
+          Bitmap.Canvas.Pixels[X, Y] := PInteger(PR)^ and $ffffff;
+          Inc(PR, DX);
+        end;
+        Inc(P, DY);
       end;
     end;