removed pascal code

1 files changed, 0 insertions, 4363 deletions

diff --git a/src/lib/JEDI-SDL/SDL/Pas/sdlutils.pas b/src/lib/JEDI-SDL/SDL/Pas/sdlutils.pas
deleted file mode 100644
index e01f3cdb..00000000
--- a/src/lib/JEDI-SDL/SDL/Pas/sdlutils.pas
+++ /dev/null
@@ -1,4363 +0,0 @@
-unit sdlutils;
-{
-  $Id: sdlutils.pas,v 1.5 2006/11/19 18:56:44 savage Exp $
-
-}
-{******************************************************************************}
-{                                                                              }
-{       Borland Delphi SDL - Simple DirectMedia Layer                          }
-{                SDL Utility functions                                         }
-{                                                                              }
-{                                                                              }
-{ The initial developer of this Pascal code was :                              }
-{ Tom Jones <tigertomjones@gmx.de>                                             }
-{                                                                              }
-{ Portions created by Tom Jones are                                            }
-{ Copyright (C) 2000 - 2001 Tom Jones.                                         }
-{                                                                              }
-{                                                                              }
-{ Contributor(s)                                                               }
-{ --------------                                                               }
-{ Dominique Louis <Dominique@SavageSoftware.com.au>                            }
-{ Róbert Kisnémeth <mikrobi@freemail.hu>                                       }
-{                                                                              }
-{ Obtained through:                                                            }
-{ Joint Endeavour of Delphi Innovators ( Project JEDI )                        }
-{                                                                              }
-{ You may retrieve the latest version of this file at the Project              }
-{ JEDI home page, located at http://delphi-jedi.org                            }
-{                                                                              }
-{ The contents of this file are used with permission, subject to               }
-{ the Mozilla Public License Version 1.1 (the "License"); you may              }
-{ not use this file except in compliance with the License. You may             }
-{ obtain a copy of the License at                                              }
-{ http://www.mozilla.org/MPL/MPL-1.1.html                                      }
-{                                                                              }
-{ Software distributed under the License is distributed on an                  }
-{ "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or               }
-{ implied. See the License for the specific language governing                 }
-{ rights and limitations under the License.                                    }
-{                                                                              }
-{ Description                                                                  }
-{ -----------                                                                  }
-{   Helper functions...                                                        }
-{                                                                              }
-{                                                                              }
-{ Requires                                                                     }
-{ --------                                                                     }
-{   SDL.dll on Windows platforms                                               }
-{   libSDL-1.1.so.0 on Linux platform                                          }
-{                                                                              }
-{ Programming Notes                                                            }
-{ -----------------                                                            }
-{                                                                              }
-{                                                                              }
-{                                                                              }
-{                                                                              }
-{ Revision History                                                             }
-{ ----------------                                                             }
-{               2000 - TJ : Initial creation                                   }
-{                                                                              }
-{   July   13   2001 - DL : Added PutPixel and GetPixel routines.              }
-{                                                                              }
-{   Sept   14   2001 - RK : Added flipping routines.                           }
-{                                                                              }
-{   Sept   19   2001 - RK : Added PutPixel & line drawing & blitting with ADD  }
-{                           effect. Fixed a bug in SDL_PutPixel & SDL_GetPixel }
-{                           Added PSDLRect()                                   }
-{   Sept   22   2001 - DL : Removed need for Windows.pas by defining types here}
-{                           Also removed by poor attempt or a dialog box       }
-{                                                                              }
-{   Sept   25   2001 - RK : Added PixelTest, NewPutPixel, SubPixel, SubLine,   }
-{                           SubSurface, MonoSurface & TexturedSurface          }
-{                                                                              }
-{   Sept   26   2001 - DL : Made change so that it refers to native Pascal     }
-{                           types rather that Windows types. This makes it more}
-{                           portable to Linix.                                 }
-{                                                                              }
-{   Sept   27   2001 - RK : SDLUtils now can be compiled with FreePascal       }
-{                                                                              }
-{   Oct    27   2001 - JF : Added ScrollY function                             }
-{                                                                              }
-{   Jan    21   2002 - RK : Added SDL_ZoomSurface and SDL_WarpSurface          }
-{                                                                              }
-{   Mar    28   2002 - JF : Added SDL_RotateSurface                            }
-{                                                                              }
-{   May    13   2002 - RK : Improved SDL_FillRectAdd & SDL_FillRectSub         }
-{                                                                              }
-{   May    27   2002 - YS : GradientFillRect function                          }
-{                                                                              }
-{   May    30   2002 - RK : Added SDL_2xBlit, SDL_Scanline2xBlit               }
-{                           & SDL_50Scanline2xBlit                             }
-{                                                                              }
-{  June    12   2002 - RK : Added SDL_PixelTestSurfaceVsRect                   }
-{                                                                              }
-{  June    12   2002 - JF : Updated SDL_PixelTestSurfaceVsRect                 }
-{                                                                              }
-{ November  9   2002 - JF : Added Jason's boolean Surface functions            }
-{                                                                              }
-{ December 10   2002 - DE : Added Dean's SDL_ClipLine function                 }
-{                                                                              }
-{    April 26   2003 - SS : Incorporated JF's changes to SDL_ClipLine          }
-{                           Fixed SDL_ClipLine bug for non-zero cliprect x, y  }
-{                           Added overloaded SDL_DrawLine for dashed lines     }
-{                                                                              }
-{******************************************************************************}
-{
-  $Log: sdlutils.pas,v $
-  Revision 1.5  2006/11/19 18:56:44  savage
-  Removed Hints and Warnings.
-
-  Revision 1.4  2004/06/02 19:38:53  savage
-  Changes to SDL_GradientFillRect as suggested by
-  Ángel Eduardo García Hernández.  Many thanks.
-
-  Revision 1.3  2004/05/29 23:11:54  savage
-  Changes to SDL_ScaleSurfaceRect as suggested by
-  Ángel Eduardo García Hernández to fix a colour issue with the function. Many thanks.
-
-  Revision 1.2  2004/02/14 00:23:39  savage
-  As UNIX is defined in jedi-sdl.inc this will be used to check linux compatability as well. Units have been changed to reflect this change.
-
-  Revision 1.1  2004/02/05 00:08:20  savage
-  Module 1.0 release
-
-
-}
-
-interface
-
-{$I jedi-sdl.inc}
-
-uses
-{$IFDEF UNIX}
-  Types,
-{$IFNDEF DARWIN}
-  Xlib,
-{$ENDIF}
-{$ENDIF}
-  SysUtils,
-  sdl;
-
-type
-  TGradientStyle = ( gsHorizontal, gsVertical );
-
-// Pixel procedures
-function SDL_PixelTest( SrcSurface1 : PSDL_Surface; SrcRect1 : PSDL_Rect; SrcSurface2 :
-  PSDL_Surface; SrcRect2 : PSDL_Rect; Left1, Top1, Left2, Top2 : integer ) : Boolean;
-
-function SDL_GetPixel( SrcSurface : PSDL_Surface; x : integer; y : integer ) : Uint32;
-
-procedure SDL_PutPixel( DstSurface : PSDL_Surface; x : integer; y : integer; pixel :
-  Uint32 );
-
-procedure SDL_AddPixel( DstSurface : PSDL_Surface; x : cardinal; y : cardinal; Color :
-  cardinal );
-
-procedure SDL_SubPixel( DstSurface : PSDL_Surface; x : cardinal; y : cardinal; Color :
-  cardinal );
-
-// Line procedures
-procedure SDL_DrawLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal ); overload;
-
-procedure SDL_DrawLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal; DashLength, DashSpace : byte ); overload;
-
-procedure SDL_AddLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal );
-
-procedure SDL_SubLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal );
-
-// Surface procedures
-procedure SDL_AddSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-
-procedure SDL_SubSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-
-procedure SDL_MonoSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect; Color : cardinal );
-
-procedure SDL_TexturedSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect; Texture : PSDL_Surface;
-  TextureRect : PSDL_Rect );
-
-procedure SDL_ZoomSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect; DstSurface : PSDL_Surface; DstRect : PSDL_Rect );
-
-procedure SDL_WarpSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect; DstSurface : PSDL_Surface; UL, UR, LR, LL : PPoint );
-
-// Flip procedures
-procedure SDL_FlipRectH( DstSurface : PSDL_Surface; Rect : PSDL_Rect );
-
-procedure SDL_FlipRectV( DstSurface : PSDL_Surface; Rect : PSDL_Rect );
-
-function PSDLRect( aLeft, aTop, aWidth, aHeight : integer ) : PSDL_Rect;
-
-function SDLRect( aLeft, aTop, aWidth, aHeight : integer ) : TSDL_Rect; overload;
-
-function SDLRect( aRect : TRect ) : TSDL_Rect; overload;
-
-function SDL_ScaleSurfaceRect( SrcSurface : PSDL_Surface; SrcX1, SrcY1, SrcW, SrcH,
-  Width, Height : integer ) : PSDL_Surface;
-
-procedure SDL_ScrollY( DstSurface : PSDL_Surface; DifY : integer );
-
-procedure SDL_ScrollX( DstSurface : PSDL_Surface; DifX : integer );
-
-procedure SDL_RotateDeg( DstSurface, SrcSurface : PSDL_Surface; SrcRect :
-  PSDL_Rect; DestX, DestY, OffsetX, OffsetY : Integer; Angle : Integer );
-
-procedure SDL_RotateRad( DstSurface, SrcSurface : PSDL_Surface; SrcRect :
-  PSDL_Rect; DestX, DestY, OffsetX, OffsetY : Integer; Angle : Single );
-
-function ValidateSurfaceRect( DstSurface : PSDL_Surface; dstrect : PSDL_Rect ) : TSDL_Rect;
-
-// Fill Rect routine
-procedure SDL_FillRectAdd( DstSurface : PSDL_Surface; dstrect : PSDL_Rect; color : UInt32 );
-
-procedure SDL_FillRectSub( DstSurface : PSDL_Surface; dstrect : PSDL_Rect; color : UInt32 );
-
-procedure SDL_GradientFillRect( DstSurface : PSDL_Surface; const Rect : PSDL_Rect; const StartColor, EndColor : TSDL_Color; const Style : TGradientStyle );
-
-// NOTE for All SDL_2xblit... function : the dest surface must be 2x of the source surface!
-procedure SDL_2xBlit( Src, Dest : PSDL_Surface );
-
-procedure SDL_Scanline2xBlit( Src, Dest : PSDL_Surface );
-
-procedure SDL_50Scanline2xBlit( Src, Dest : PSDL_Surface );
-
-//
-function SDL_PixelTestSurfaceVsRect( SrcSurface1 : PSDL_Surface; SrcRect1 :
-  PSDL_Rect; SrcRect2 : PSDL_Rect; Left1, Top1, Left2, Top2 : integer ) :
-  boolean;
-
-// Jason's boolean Surface functions
-procedure SDL_ORSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-
-procedure SDL_ANDSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-
-
-procedure SDL_GTSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-
-procedure SDL_LTSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-
-function SDL_ClipLine( var x1, y1, x2, y2 : Integer; ClipRect : PSDL_Rect ) : boolean;
-
-implementation
-
-uses
-  Math;
-
-function SDL_PixelTest( SrcSurface1 : PSDL_Surface; SrcRect1 : PSDL_Rect; SrcSurface2 :
-  PSDL_Surface; SrcRect2 : PSDL_Rect; Left1, Top1, Left2, Top2 : integer ) : boolean;
-var
-  Src_Rect1, Src_Rect2 : TSDL_Rect;
-  right1, bottom1 : integer;
-  right2, bottom2 : integer;
-  Scan1Start, Scan2Start, ScanWidth, ScanHeight : cardinal;
-  Mod1, Mod2   : cardinal;
-  Addr1, Addr2 : PtrUInt;
-  BPP          : cardinal;
-  Pitch1, Pitch2 : cardinal;
-  TransparentColor1, TransparentColor2 : cardinal;
-  tx, ty       : cardinal;
-// StartTick    : cardinal; // Auto Removed, Unused Variable
-  Color1, Color2 : cardinal;
-begin
-  Result := false;
-  if SrcRect1 = nil then
-  begin
-    with Src_Rect1 do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface1.w;
-      h := SrcSurface1.h;
-    end;
-  end
-  else
-    Src_Rect1 := SrcRect1^;
-  if SrcRect2 = nil then
-  begin
-    with Src_Rect2 do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface2.w;
-      h := SrcSurface2.h;
-    end;
-  end
-  else
-    Src_Rect2 := SrcRect2^;
-  with Src_Rect1 do
-  begin
-    Right1 := Left1 + w;
-    Bottom1 := Top1 + h;
-  end;
-  with Src_Rect2 do
-  begin
-    Right2 := Left2 + w;
-    Bottom2 := Top2 + h;
-  end;
-  if ( Left1 >= Right2 ) or ( Right1 <= Left2 ) or ( Top1 >= Bottom2 ) or ( Bottom1 <=
-    Top2 ) then
-    exit;
-  if Left1 <= Left2 then
-  begin
-    // 1. left, 2. right
-    Scan1Start := Src_Rect1.x + Left2 - Left1;
-    Scan2Start := Src_Rect2.x;
-    ScanWidth := Right1 - Left2;
-    with Src_Rect2 do
-      if ScanWidth > w then
-        ScanWidth := w;
-  end
-  else
-  begin
-    // 1. right, 2. left
-    Scan1Start := Src_Rect1.x;
-    Scan2Start := Src_Rect2.x + Left1 - Left2;
-    ScanWidth := Right2 - Left1;
-    with Src_Rect1 do
-      if ScanWidth > w then
-        ScanWidth := w;
-  end;
-  with SrcSurface1^ do
-  begin
-    Pitch1 := Pitch;
-    Addr1 := PtrUInt( Pixels );
-    inc( Addr1, Pitch1 * UInt32( Src_Rect1.y ) );
-    with format^ do
-    begin
-      BPP := BytesPerPixel;
-      TransparentColor1 := colorkey;
-    end;
-  end;
-  with SrcSurface2^ do
-  begin
-    TransparentColor2 := format.colorkey;
-    Pitch2 := Pitch;
-    Addr2 := PtrUInt( Pixels );
-    inc( Addr2, Pitch2 * UInt32( Src_Rect2.y ) );
-  end;
-  Mod1 := Pitch1 - ( ScanWidth * BPP );
-  Mod2 := Pitch2 - ( ScanWidth * BPP );
-  inc( Addr1, BPP * Scan1Start );
-  inc( Addr2, BPP * Scan2Start );
-  if Top1 <= Top2 then
-  begin
-    // 1. up, 2. down
-    ScanHeight := Bottom1 - Top2;
-    if ScanHeight > Src_Rect2.h then
-      ScanHeight := Src_Rect2.h;
-    inc( Addr1, Pitch1 * UInt32( Top2 - Top1 ) );
-  end
-  else
-  begin
-    // 1. down, 2. up
-    ScanHeight := Bottom2 - Top1;
-    if ScanHeight > Src_Rect1.h then
-      ScanHeight := Src_Rect1.h;
-    inc( Addr2, Pitch2 * UInt32( Top1 - Top2 ) );
-  end;
-  case BPP of
-    1 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          if ( PByte( Addr1 )^ <> TransparentColor1 ) and ( PByte( Addr2 )^ <>
-            TransparentColor2 ) then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1 );
-          inc( Addr2 );
-        end;
-        inc( Addr1, Mod1 );
-        inc( Addr2, Mod2 );
-      end;
-    2 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          if ( PWord( Addr1 )^ <> TransparentColor1 ) and ( PWord( Addr2 )^ <>
-            TransparentColor2 ) then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1, 2 );
-          inc( Addr2, 2 );
-        end;
-        inc( Addr1, Mod1 );
-        inc( Addr2, Mod2 );
-      end;
-    3 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          Color1 := PLongWord( Addr1 )^ and $00FFFFFF;
-          Color2 := PLongWord( Addr2 )^ and $00FFFFFF;
-          if ( Color1 <> TransparentColor1 ) and ( Color2 <> TransparentColor2 )
-            then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1, 3 );
-          inc( Addr2, 3 );
-        end;
-        inc( Addr1, Mod1 );
-        inc( Addr2, Mod2 );
-      end;
-    4 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          if ( PLongWord( Addr1 )^ <> TransparentColor1 ) and ( PLongWord( Addr2 )^ <>
-            TransparentColor2 ) then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1, 4 );
-          inc( Addr2, 4 );
-        end;
-        inc( Addr1, Mod1 );
-        inc( Addr2, Mod2 );
-      end;
-  end;
-end;
-
-procedure SDL_AddPixel( DstSurface : PSDL_Surface; x : cardinal; y : cardinal; Color :
-  cardinal );
-var
-  SrcColor     : cardinal;
-  Addr         : PtrUInt;
-  R, G, B      : cardinal;
-begin
-  if Color = 0 then
-    exit;
-  with DstSurface^ do
-  begin
-    Addr := PtrUInt( Pixels ) + y * Pitch + x * format.BytesPerPixel;
-    SrcColor := PUInt32( Addr )^;
-    case format.BitsPerPixel of
-      8 :
-        begin
-          R := SrcColor and $E0 + Color and $E0;
-          G := SrcColor and $1C + Color and $1C;
-          B := SrcColor and $03 + Color and $03;
-          if R > $E0 then
-            R := $E0;
-          if G > $1C then
-            G := $1C;
-          if B > $03 then
-            B := $03;
-          PUInt8( Addr )^ := R or G or B;
-        end;
-      15 :
-        begin
-          R := SrcColor and $7C00 + Color and $7C00;
-          G := SrcColor and $03E0 + Color and $03E0;
-          B := SrcColor and $001F + Color and $001F;
-          if R > $7C00 then
-            R := $7C00;
-          if G > $03E0 then
-            G := $03E0;
-          if B > $001F then
-            B := $001F;
-          PUInt16( Addr )^ := R or G or B;
-        end;
-      16 :
-        begin
-          R := SrcColor and $F800 + Color and $F800;
-          G := SrcColor and $07C0 + Color and $07C0;
-          B := SrcColor and $001F + Color and $001F;
-          if R > $F800 then
-            R := $F800;
-          if G > $07C0 then
-            G := $07C0;
-          if B > $001F then
-            B := $001F;
-          PUInt16( Addr )^ := R or G or B;
-        end;
-      24 :
-        begin
-          R := SrcColor and $00FF0000 + Color and $00FF0000;
-          G := SrcColor and $0000FF00 + Color and $0000FF00;
-          B := SrcColor and $000000FF + Color and $000000FF;
-          if R > $FF0000 then
-            R := $FF0000;
-          if G > $00FF00 then
-            G := $00FF00;
-          if B > $0000FF then
-            B := $0000FF;
-          PUInt32( Addr )^ := SrcColor and $FF000000 or R or G or B;
-        end;
-      32 :
-        begin
-          R := SrcColor and $00FF0000 + Color and $00FF0000;
-          G := SrcColor and $0000FF00 + Color and $0000FF00;
-          B := SrcColor and $000000FF + Color and $000000FF;
-          if R > $FF0000 then
-            R := $FF0000;
-          if G > $00FF00 then
-            G := $00FF00;
-          if B > $0000FF then
-            B := $0000FF;
-          PUInt32( Addr )^ := R or G or B;
-        end;
-    end;
-  end;
-end;
-
-procedure SDL_SubPixel( DstSurface : PSDL_Surface; x : cardinal; y : cardinal; Color :
-  cardinal );
-var
-  SrcColor     : cardinal;
-  Addr         : PtrUInt;
-  R, G, B      : cardinal;
-begin
-  if Color = 0 then
-    exit;
-  with DstSurface^ do
-  begin
-    Addr := PtrUInt( Pixels ) + y * Pitch + x * format.BytesPerPixel;
-    SrcColor := PUInt32( Addr )^;
-    case format.BitsPerPixel of
-      8 :
-        begin
-          R := SrcColor and $E0 - Color and $E0;
-          G := SrcColor and $1C - Color and $1C;
-          B := SrcColor and $03 - Color and $03;
-          if R > $E0 then
-            R := 0;
-          if G > $1C then
-            G := 0;
-          if B > $03 then
-            B := 0;
-          PUInt8( Addr )^ := R or G or B;
-        end;
-      15 :
-        begin
-          R := SrcColor and $7C00 - Color and $7C00;
-          G := SrcColor and $03E0 - Color and $03E0;
-          B := SrcColor and $001F - Color and $001F;
-          if R > $7C00 then
-            R := 0;
-          if G > $03E0 then
-            G := 0;
-          if B > $001F then
-            B := 0;
-          PUInt16( Addr )^ := R or G or B;
-        end;
-      16 :
-        begin
-          R := SrcColor and $F800 - Color and $F800;
-          G := SrcColor and $07C0 - Color and $07C0;
-          B := SrcColor and $001F - Color and $001F;
-          if R > $F800 then
-            R := 0;
-          if G > $07C0 then
-            G := 0;
-          if B > $001F then
-            B := 0;
-          PUInt16( Addr )^ := R or G or B;
-        end;
-      24 :
-        begin
-          R := SrcColor and $00FF0000 - Color and $00FF0000;
-          G := SrcColor and $0000FF00 - Color and $0000FF00;
-          B := SrcColor and $000000FF - Color and $000000FF;
-          if R > $FF0000 then
-            R := 0;
-          if G > $00FF00 then
-            G := 0;
-          if B > $0000FF then
-            B := 0;
-          PUInt32( Addr )^ := SrcColor and $FF000000 or R or G or B;
-        end;
-      32 :
-        begin
-          R := SrcColor and $00FF0000 - Color and $00FF0000;
-          G := SrcColor and $0000FF00 - Color and $0000FF00;
-          B := SrcColor and $000000FF - Color and $000000FF;
-          if R > $FF0000 then
-            R := 0;
-          if G > $00FF00 then
-            G := 0;
-          if B > $0000FF then
-            B := 0;
-          PUInt32( Addr )^ := R or G or B;
-        end;
-    end;
-  end;
-end;
-// This procedure works on 8, 15, 16, 24 and 32 bits color depth surfaces.
-// In 8 bit color depth mode the procedure works with the default packed
-//  palette (RRRGGGBB). It handles all clipping.
-
-procedure SDL_AddSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-var
-  R, G, B, Pixel1, Pixel2, TransparentColor : cardinal;
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  Bits         : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    Bits := Format.BitsPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case bits of
-    8 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt8( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt8( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel1 and $E0 + Pixel2 and $E0;
-                G := Pixel1 and $1C + Pixel2 and $1C;
-                B := Pixel1 and $03 + Pixel2 and $03;
-                if R > $E0 then
-                  R := $E0;
-                if G > $1C then
-                  G := $1C;
-                if B > $03 then
-                  B := $03;
-                PUInt8( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt8( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    15 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel1 and $7C00 + Pixel2 and $7C00;
-                G := Pixel1 and $03E0 + Pixel2 and $03E0;
-                B := Pixel1 and $001F + Pixel2 and $001F;
-                if R > $7C00 then
-                  R := $7C00;
-                if G > $03E0 then
-                  G := $03E0;
-                if B > $001F then
-                  B := $001F;
-                PUInt16( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt16( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    16 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel1 and $F800 + Pixel2 and $F800;
-                G := Pixel1 and $07E0 + Pixel2 and $07E0;
-                B := Pixel1 and $001F + Pixel2 and $001F;
-                if R > $F800 then
-                  R := $F800;
-                if G > $07E0 then
-                  G := $07E0;
-                if B > $001F then
-                  B := $001F;
-                PUInt16( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt16( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    24 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^ and $00FFFFFF;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^ and $00FFFFFF;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel1 and $FF0000 + Pixel2 and $FF0000;
-                G := Pixel1 and $00FF00 + Pixel2 and $00FF00;
-                B := Pixel1 and $0000FF + Pixel2 and $0000FF;
-                if R > $FF0000 then
-                  R := $FF0000;
-                if G > $00FF00 then
-                  G := $00FF00;
-                if B > $0000FF then
-                  B := $0000FF;
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or ( R or G or B );
-              end
-              else
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or Pixel1;
-            end;
-            inc( SrcAddr, 3 );
-            inc( DestAddr, 3 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    32 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel1 and $FF0000 + Pixel2 and $FF0000;
-                G := Pixel1 and $00FF00 + Pixel2 and $00FF00;
-                B := Pixel1 and $0000FF + Pixel2 and $0000FF;
-                if R > $FF0000 then
-                  R := $FF0000;
-                if G > $00FF00 then
-                  G := $00FF00;
-                if B > $0000FF then
-                  B := $0000FF;
-                PUInt32( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt32( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 4 );
-            inc( DestAddr, 4 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-
-procedure SDL_SubSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-var
-  R, G, B, Pixel1, Pixel2, TransparentColor : cardinal;
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-//{*_ebx, *}{*_esi, *}{*_edi, _esp*} : cardinal; // Auto Removed, Unused Variable (_ebx) // Auto Removed, Unused Variable (_esi) // Auto Removed, Unused Variable (_edi)
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  Bits         : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    Bits := DestSurface.Format.BitsPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case bits of
-    8 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt8( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt8( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel2 and $E0 - Pixel1 and $E0;
-                G := Pixel2 and $1C - Pixel1 and $1C;
-                B := Pixel2 and $03 - Pixel1 and $03;
-                if R > $E0 then
-                  R := 0;
-                if G > $1C then
-                  G := 0;
-                if B > $03 then
-                  B := 0;
-                PUInt8( DestAddr )^ := R or G or B;
-              end;
-            end;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    15 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel2 and $7C00 - Pixel1 and $7C00;
-                G := Pixel2 and $03E0 - Pixel1 and $03E0;
-                B := Pixel2 and $001F - Pixel1 and $001F;
-                if R > $7C00 then
-                  R := 0;
-                if G > $03E0 then
-                  G := 0;
-                if B > $001F then
-                  B := 0;
-                PUInt16( DestAddr )^ := R or G or B;
-              end;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    16 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel2 and $F800 - Pixel1 and $F800;
-                G := Pixel2 and $07E0 - Pixel1 and $07E0;
-                B := Pixel2 and $001F - Pixel1 and $001F;
-                if R > $F800 then
-                  R := 0;
-                if G > $07E0 then
-                  G := 0;
-                if B > $001F then
-                  B := 0;
-                PUInt16( DestAddr )^ := R or G or B;
-              end;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    24 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^ and $00FFFFFF;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^ and $00FFFFFF;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel2 and $FF0000 - Pixel1 and $FF0000;
-                G := Pixel2 and $00FF00 - Pixel1 and $00FF00;
-                B := Pixel2 and $0000FF - Pixel1 and $0000FF;
-                if R > $FF0000 then
-                  R := 0;
-                if G > $00FF00 then
-                  G := 0;
-                if B > $0000FF then
-                  B := 0;
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or ( R or G or B );
-              end;
-            end;
-            inc( SrcAddr, 3 );
-            inc( DestAddr, 3 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    32 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                R := Pixel2 and $FF0000 - Pixel1 and $FF0000;
-                G := Pixel2 and $00FF00 - Pixel1 and $00FF00;
-                B := Pixel2 and $0000FF - Pixel1 and $0000FF;
-                if R > $FF0000 then
-                  R := 0;
-                if G > $00FF00 then
-                  G := 0;
-                if B > $0000FF then
-                  B := 0;
-                PUInt32( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt32( DestAddr )^ := Pixel2;
-            end;
-            inc( SrcAddr, 4 );
-            inc( DestAddr, 4 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-
-procedure SDL_MonoSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect; Color : cardinal );
-var
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-//{*_ebx, *}{*_esi, *}{*_edi, _esp*} : cardinal; // Auto Removed, Unused Variable (_ebx) // Auto Removed, Unused Variable (_esi) // Auto Removed, Unused Variable (_edi)
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  TransparentColor, SrcColor : cardinal;
-  BPP          : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    BPP := DestSurface.Format.BytesPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case BPP of
-    1 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt8( SrcAddr )^;
-            if SrcColor <> TransparentColor then
-              PUInt8( DestAddr )^ := SrcColor;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    2 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt16( SrcAddr )^;
-            if SrcColor <> TransparentColor then
-              PUInt16( DestAddr )^ := SrcColor;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    3 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt32( SrcAddr )^ and $FFFFFF;
-            if SrcColor <> TransparentColor then
-              PUInt32( DestAddr )^ := ( PUInt32( DestAddr )^ and $FFFFFF ) or SrcColor;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    4 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt32( SrcAddr )^;
-            if SrcColor <> TransparentColor then
-              PUInt32( DestAddr )^ := SrcColor;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-// TextureRect.w and TextureRect.h are not used.
-// The TextureSurface's size MUST larger than the drawing rectangle!!!
-
-procedure SDL_TexturedSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect; Texture : PSDL_Surface;
-  TextureRect : PSDL_Rect );
-var
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr, TextAddr : PtrUInt;
-//{*_ebx, *}{*_esi, *}{*_edi, _esp*}: cardinal; // Auto Removed, Unused Variable (_ebx) // Auto Removed, Unused Variable (_esi) // Auto Removed, Unused Variable (_edi)
-  WorkX, WorkY : word;
-  SrcMod, DestMod, TextMod : cardinal;
-SrcColor, TransparentColor{*, TextureColor*} : cardinal; // Auto Removed, Unused Variable (TextureColor)
-  BPP          : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    BPP := DestSurface.Format.BitsPerPixel;
-  end;
-  with Texture^ do
-  begin
-    TextAddr := PtrUInt( Pixels ) + UInt32( TextureRect.y ) * Pitch +
-      UInt32( TextureRect.x ) * Format.BytesPerPixel;
-    TextMod := Pitch - Src.w * Format.BytesPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  SDL_LockSurface( Texture );
-  WorkY := Src.h;
-  case BPP of
-    1 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt8( SrcAddr )^;
-            if SrcColor <> TransparentColor then
-              PUInt8( DestAddr )^ := PUint8( TextAddr )^;
-            inc( SrcAddr );
-            inc( DestAddr );
-            inc( TextAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          inc( TextAddr, TextMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    2 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt16( SrcAddr )^;
-            if SrcColor <> TransparentColor then
-              PUInt16( DestAddr )^ := PUInt16( TextAddr )^;
-            inc( SrcAddr );
-            inc( DestAddr );
-            inc( TextAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          inc( TextAddr, TextMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    3 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt32( SrcAddr )^ and $FFFFFF;
-            if SrcColor <> TransparentColor then
-              PUInt32( DestAddr )^ := ( PUInt32( DestAddr )^ and $FFFFFF ) or ( PUInt32( TextAddr )^ and $FFFFFF );
-            inc( SrcAddr );
-            inc( DestAddr );
-            inc( TextAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          inc( TextAddr, TextMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    4 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            SrcColor := PUInt32( SrcAddr )^;
-            if SrcColor <> TransparentColor then
-              PUInt32( DestAddr )^ := PUInt32( TextAddr )^;
-            inc( SrcAddr );
-            inc( DestAddr );
-            inc( TextAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          inc( TextAddr, TextMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-  SDL_UnlockSurface( Texture );
-end;
-
-procedure SDL_ZoomSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect; DstSurface : PSDL_Surface; DstRect : PSDL_Rect );
-var
-  xc, yc       : cardinal;
-  rx, wx, ry, wy, ry16 : cardinal;
-  color        : cardinal;
-  modx, mody   : cardinal;
-begin
-  // Warning! No checks for surface pointers!!!
-  if srcrect = nil then
-    srcrect := @SrcSurface.clip_rect;
-  if dstrect = nil then
-    dstrect := @DstSurface.clip_rect;
-  if SDL_MustLock( SrcSurface ) then
-    SDL_LockSurface( SrcSurface );
-  if SDL_MustLock( DstSurface ) then
-    SDL_LockSurface( DstSurface );
-  modx := trunc( ( srcrect.w / dstrect.w ) * 65536 );
-  mody := trunc( ( srcrect.h / dstrect.h ) * 65536 );
-  //rx := srcrect.x * 65536;
-  ry := srcrect.y * 65536;
-  wy := dstrect.y;
-  for yc := 0 to dstrect.h - 1 do
-  begin
-    rx := srcrect.x * 65536;
-    wx := dstrect.x;
-    ry16 := ry shr 16;
-    for xc := 0 to dstrect.w - 1 do
-    begin
-      color := SDL_GetPixel( SrcSurface, rx shr 16, ry16 );
-      SDL_PutPixel( DstSurface, wx, wy, color );
-      rx := rx + modx;
-      inc( wx );
-    end;
-    ry := ry + mody;
-    inc( wy );
-  end;
-  if SDL_MustLock( SrcSurface ) then
-    SDL_UnlockSurface( SrcSurface );
-  if SDL_MustLock( DstSurface ) then
-    SDL_UnlockSurface( DstSurface );
-end;
-// Re-map a rectangular area into an area defined by four vertices
-// Converted from C to Pascal by KiCHY
-
-procedure SDL_WarpSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect; DstSurface : PSDL_Surface; UL, UR, LR, LL : PPoint );
-const
-  SHIFTS       = 15; // Extend ints to limit round-off error (try 2 - 20)
-  THRESH       = 1 shl SHIFTS; // Threshold for pixel size value
-  procedure CopySourceToDest( UL, UR, LR, LL : TPoint; x1, y1, x2, y2 : cardinal );
-  var
-    tm, lm, rm, bm, m : TPoint;
-    mx, my     : cardinal;
-    cr         : cardinal;
-  begin
-    // Does the destination area specify a single pixel?
-    if ( ( abs( ul.x - ur.x ) < THRESH ) and
-      ( abs( ul.x - lr.x ) < THRESH ) and
-      ( abs( ul.x - ll.x ) < THRESH ) and
-      ( abs( ul.y - ur.y ) < THRESH ) and
-      ( abs( ul.y - lr.y ) < THRESH ) and
-      ( abs( ul.y - ll.y ) < THRESH ) ) then
-    begin // Yes
-      cr := SDL_GetPixel( SrcSurface, ( x1 shr SHIFTS ), ( y1 shr SHIFTS ) );
-      SDL_PutPixel( DstSurface, ( ul.x shr SHIFTS ), ( ul.y shr SHIFTS ), cr );
-    end
-    else
-    begin // No
-      // Quarter the source and the destination, and then recurse
-      tm.x := ( ul.x + ur.x ) shr 1;
-      tm.y := ( ul.y + ur.y ) shr 1;
-      bm.x := ( ll.x + lr.x ) shr 1;
-      bm.y := ( ll.y + lr.y ) shr 1;
-      lm.x := ( ul.x + ll.x ) shr 1;
-      lm.y := ( ul.y + ll.y ) shr 1;
-      rm.x := ( ur.x + lr.x ) shr 1;
-      rm.y := ( ur.y + lr.y ) shr 1;
-      m.x := ( tm.x + bm.x ) shr 1;
-      m.y := ( tm.y + bm.y ) shr 1;
-      mx := ( x1 + x2 ) shr 1;
-      my := ( y1 + y2 ) shr 1;
-      CopySourceToDest( ul, tm, m, lm, x1, y1, mx, my );
-      CopySourceToDest( tm, ur, rm, m, mx, y1, x2, my );
-      CopySourceToDest( m, rm, lr, bm, mx, my, x2, y2 );
-      CopySourceToDest( lm, m, bm, ll, x1, my, mx, y2 );
-    end;
-  end;
-var
-  _UL, _UR, _LR, _LL : TPoint;
-  Rect_x, Rect_y, Rect_w, Rect_h : integer;
-begin
-  if SDL_MustLock( SrcSurface ) then
-    SDL_LockSurface( SrcSurface );
-  if SDL_MustLock( DstSurface ) then
-    SDL_LockSurface( DstSurface );
-  if SrcRect = nil then
-  begin
-    Rect_x := 0;
-    Rect_y := 0;
-    Rect_w := ( SrcSurface.w - 1 ) shl SHIFTS;
-    Rect_h := ( SrcSurface.h - 1 ) shl SHIFTS;
-  end
-  else
-  begin
-    Rect_x := SrcRect.x;
-    Rect_y := SrcRect.y;
-    Rect_w := ( SrcRect.w - 1 ) shl SHIFTS;
-    Rect_h := ( SrcRect.h - 1 ) shl SHIFTS;
-  end;
-  // Shift all values to help reduce round-off error.
-  _ul.x := ul.x shl SHIFTS;
-  _ul.y := ul.y shl SHIFTS;
-  _ur.x := ur.x shl SHIFTS;
-  _ur.y := ur.y shl SHIFTS;
-  _lr.x := lr.x shl SHIFTS;
-  _lr.y := lr.y shl SHIFTS;
-  _ll.x := ll.x shl SHIFTS;
-  _ll.y := ll.y shl SHIFTS;
-  CopySourceToDest( _ul, _ur, _lr, _ll, Rect_x, Rect_y, Rect_w, Rect_h );
-  if SDL_MustLock( SrcSurface ) then
-    SDL_UnlockSurface( SrcSurface );
-  if SDL_MustLock( DstSurface ) then
-    SDL_UnlockSurface( DstSurface );
-end;
-
-// Draw a line between x1,y1 and x2,y2 to the given surface
-// NOTE: The surface must be locked before calling this!
-
-procedure SDL_DrawLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal );
-var
-  dx, dy, sdx, sdy, x, y, px, py : integer;
-begin
-  dx := x2 - x1;
-  dy := y2 - y1;
-  if dx < 0 then
-    sdx := -1
-  else
-    sdx := 1;
-  if dy < 0 then
-    sdy := -1
-  else
-    sdy := 1;
-  dx := sdx * dx + 1;
-  dy := sdy * dy + 1;
-  x := 0;
-  y := 0;
-  px := x1;
-  py := y1;
-  if dx >= dy then
-  begin
-    for x := 0 to dx - 1 do
-    begin
-      SDL_PutPixel( DstSurface, px, py, Color );
-      y := y + dy;
-      if y >= dx then
-      begin
-        y := y - dx;
-        py := py + sdy;
-      end;
-      px := px + sdx;
-    end;
-  end
-  else
-  begin
-    for y := 0 to dy - 1 do
-    begin
-      SDL_PutPixel( DstSurface, px, py, Color );
-      x := x + dx;
-      if x >= dy then
-      begin
-        x := x - dy;
-        px := px + sdx;
-      end;
-      py := py + sdy;
-    end;
-  end;
-end;
-
-// Draw a dashed line between x1,y1 and x2,y2 to the given surface
-// NOTE: The surface must be locked before calling this!
-
-procedure SDL_DrawLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal; DashLength, DashSpace : byte ); overload;
-var
-  dx, dy, sdx, sdy, x, y, px, py, counter : integer; drawdash : boolean;
-begin
-  counter := 0;
-  drawdash := true; //begin line drawing with dash
-
-  //Avoid invalid user-passed dash parameters
-  if ( DashLength < 1 )
-    then
-    DashLength := 1;
-  if ( DashSpace < 1 )
-    then
-    DashSpace := 0;
-
-  dx := x2 - x1;
-  dy := y2 - y1;
-  if dx < 0 then
-    sdx := -1
-  else
-    sdx := 1;
-  if dy < 0 then
-    sdy := -1
-  else
-    sdy := 1;
-  dx := sdx * dx + 1;
-  dy := sdy * dy + 1;
-  x := 0;
-  y := 0;
-  px := x1;
-  py := y1;
-  if dx >= dy then
-  begin
-    for x := 0 to dx - 1 do
-    begin
-
-      //Alternate drawing dashes, or leaving spaces
-      if drawdash then
-      begin
-        SDL_PutPixel( DstSurface, px, py, Color );
-        inc( counter );
-        if ( counter > DashLength - 1 ) and ( DashSpace > 0 ) then
-        begin
-          drawdash := false;
-          counter := 0;
-        end;
-      end
-      else //space
-      begin
-        inc( counter );
-        if counter > DashSpace - 1 then
-        begin
-          drawdash := true;
-          counter := 0;
-        end;
-      end;
-
-      y := y + dy;
-      if y >= dx then
-      begin
-        y := y - dx;
-        py := py + sdy;
-      end;
-      px := px + sdx;
-    end;
-  end
-  else
-  begin
-    for y := 0 to dy - 1 do
-    begin
-
-      //Alternate drawing dashes, or leaving spaces
-      if drawdash then
-      begin
-        SDL_PutPixel( DstSurface, px, py, Color );
-        inc( counter );
-        if ( counter > DashLength - 1 ) and ( DashSpace > 0 ) then
-        begin
-          drawdash := false;
-          counter := 0;
-        end;
-      end
-      else //space
-      begin
-        inc( counter );
-        if counter > DashSpace - 1 then
-        begin
-          drawdash := true;
-          counter := 0;
-        end;
-      end;
-
-      x := x + dx;
-      if x >= dy then
-      begin
-        x := x - dy;
-        px := px + sdx;
-      end;
-      py := py + sdy;
-    end;
-  end;
-end;
-
-procedure SDL_AddLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal );
-var
-  dx, dy, sdx, sdy, x, y, px, py : integer;
-begin
-  dx := x2 - x1;
-  dy := y2 - y1;
-  if dx < 0 then
-    sdx := -1
-  else
-    sdx := 1;
-  if dy < 0 then
-    sdy := -1
-  else
-    sdy := 1;
-  dx := sdx * dx + 1;
-  dy := sdy * dy + 1;
-  x := 0;
-  y := 0;
-  px := x1;
-  py := y1;
-  if dx >= dy then
-  begin
-    for x := 0 to dx - 1 do
-    begin
-      SDL_AddPixel( DstSurface, px, py, Color );
-      y := y + dy;
-      if y >= dx then
-      begin
-        y := y - dx;
-        py := py + sdy;
-      end;
-      px := px + sdx;
-    end;
-  end
-  else
-  begin
-    for y := 0 to dy - 1 do
-    begin
-      SDL_AddPixel( DstSurface, px, py, Color );
-      x := x + dx;
-      if x >= dy then
-      begin
-        x := x - dy;
-        px := px + sdx;
-      end;
-      py := py + sdy;
-    end;
-  end;
-end;
-
-procedure SDL_SubLine( DstSurface : PSDL_Surface; x1, y1, x2, y2 : integer; Color :
-  cardinal );
-var
-  dx, dy, sdx, sdy, x, y, px, py : integer;
-begin
-  dx := x2 - x1;
-  dy := y2 - y1;
-  if dx < 0 then
-    sdx := -1
-  else
-    sdx := 1;
-  if dy < 0 then
-    sdy := -1
-  else
-    sdy := 1;
-  dx := sdx * dx + 1;
-  dy := sdy * dy + 1;
-  x := 0;
-  y := 0;
-  px := x1;
-  py := y1;
-  if dx >= dy then
-  begin
-    for x := 0 to dx - 1 do
-    begin
-      SDL_SubPixel( DstSurface, px, py, Color );
-      y := y + dy;
-      if y >= dx then
-      begin
-        y := y - dx;
-        py := py + sdy;
-      end;
-      px := px + sdx;
-    end;
-  end
-  else
-  begin
-    for y := 0 to dy - 1 do
-    begin
-      SDL_SubPixel( DstSurface, px, py, Color );
-      x := x + dx;
-      if x >= dy then
-      begin
-        x := x - dy;
-        px := px + sdx;
-      end;
-      py := py + sdy;
-    end;
-  end;
-end;
-
-// flips a rectangle vertically on given surface
-
-procedure SDL_FlipRectV( DstSurface : PSDL_Surface; Rect : PSDL_Rect );
-var
-  TmpRect      : TSDL_Rect;
-  Locked       : boolean;
-  y, FlipLength, RowLength : integer;
-  Row1, Row2   : Pointer;
-  OneRow       : TByteArray; // Optimize it if you wish
-begin
-  if DstSurface <> nil then
-  begin
-    if Rect = nil then
-    begin // if Rect=nil then we flip the whole surface
-      TmpRect := SDLRect( 0, 0, DstSurface.w, DstSurface.h );
-      Rect := @TmpRect;
-    end;
-    FlipLength := Rect^.h shr 1 - 1;
-    RowLength := Rect^.w * DstSurface^.format.BytesPerPixel;
-    if SDL_MustLock( DstSurface ) then
-    begin
-      Locked := true;
-      SDL_LockSurface( DstSurface );
-    end
-    else
-      Locked := false;
-    Row1 := pointer( PtrUInt( DstSurface^.Pixels ) + UInt32( Rect^.y ) *
-      DstSurface^.Pitch );
-    Row2 := pointer( PtrUInt( DstSurface^.Pixels ) + ( UInt32( Rect^.y ) + Rect^.h - 1 )
-      * DstSurface^.Pitch );
-    for y := 0 to FlipLength do
-    begin
-      Move( Row1^, OneRow, RowLength );
-      Move( Row2^, Row1^, RowLength );
-      Move( OneRow, Row2^, RowLength );
-      inc( PtrUInt( Row1 ), DstSurface^.Pitch );
-      dec( PtrUInt( Row2 ), DstSurface^.Pitch );
-    end;
-    if Locked then
-      SDL_UnlockSurface( DstSurface );
-  end;
-end;
-
-// flips a rectangle horizontally on given surface
-
-procedure SDL_FlipRectH( DstSurface : PSDL_Surface; Rect : PSDL_Rect );
-type
-  T24bit = packed array[ 0..2 ] of byte;
-  T24bitArray = packed array[ 0..8191 ] of T24bit;
-  P24bitArray = ^T24bitArray;
-  TLongWordArray = array[ 0..8191 ] of LongWord;
-  PLongWordArray = ^TLongWordArray;
-var
-  TmpRect      : TSDL_Rect;
-  Row8bit      : PByteArray;
-  Row16bit     : PWordArray;
-  Row24bit     : P24bitArray;
-  Row32bit     : PLongWordArray;
-  y, x, RightSide, FlipLength : integer;
-  Pixel        : cardinal;
-  Pixel24      : T24bit;
-  Locked       : boolean;
-begin
-  if DstSurface <> nil then
-  begin
-    if Rect = nil then
-    begin
-      TmpRect := SDLRect( 0, 0, DstSurface.w, DstSurface.h );
-      Rect := @TmpRect;
-    end;
-    FlipLength := Rect^.w shr 1 - 1;
-    if SDL_MustLock( DstSurface ) then
-    begin
-      Locked := true;
-      SDL_LockSurface( DstSurface );
-    end
-    else
-      Locked := false;
-    case DstSurface^.format.BytesPerPixel of
-      1 :
-        begin
-          Row8Bit := pointer( PtrUInt( DstSurface^.pixels ) + UInt32( Rect^.y ) *
-            DstSurface^.pitch );
-          for y := 1 to Rect^.h do
-          begin
-            RightSide := Rect^.w - 1;
-            for x := 0 to FlipLength do
-            begin
-              Pixel := Row8Bit^[ x ];
-              Row8Bit^[ x ] := Row8Bit^[ RightSide ];
-              Row8Bit^[ RightSide ] := Pixel;
-              dec( RightSide );
-            end;
-            inc( PtrUInt( Row8Bit ), DstSurface^.pitch );
-          end;
-        end;
-      2 :
-        begin
-          Row16Bit := pointer( PtrUInt( DstSurface^.pixels ) + UInt32( Rect^.y ) *
-            DstSurface^.pitch );
-          for y := 1 to Rect^.h do
-          begin
-            RightSide := Rect^.w - 1;
-            for x := 0 to FlipLength do
-            begin
-              Pixel := Row16Bit^[ x ];
-              Row16Bit^[ x ] := Row16Bit^[ RightSide ];
-              Row16Bit^[ RightSide ] := Pixel;
-              dec( RightSide );
-            end;
-            inc( PtrUInt( Row16Bit ), DstSurface^.pitch );
-          end;
-        end;
-      3 :
-        begin
-          Row24Bit := pointer( PtrUInt( DstSurface^.pixels ) + UInt32( Rect^.y ) *
-            DstSurface^.pitch );
-          for y := 1 to Rect^.h do
-          begin
-            RightSide := Rect^.w - 1;
-            for x := 0 to FlipLength do
-            begin
-              Pixel24 := Row24Bit^[ x ];
-              Row24Bit^[ x ] := Row24Bit^[ RightSide ];
-              Row24Bit^[ RightSide ] := Pixel24;
-              dec( RightSide );
-            end;
-            inc( PtrUInt( Row24Bit ), DstSurface^.pitch );
-          end;
-        end;
-      4 :
-        begin
-          Row32Bit := pointer( PtrUInt( DstSurface^.pixels ) + UInt32( Rect^.y ) *
-            DstSurface^.pitch );
-          for y := 1 to Rect^.h do
-          begin
-            RightSide := Rect^.w - 1;
-            for x := 0 to FlipLength do
-            begin
-              Pixel := Row32Bit^[ x ];
-              Row32Bit^[ x ] := Row32Bit^[ RightSide ];
-              Row32Bit^[ RightSide ] := Pixel;
-              dec( RightSide );
-            end;
-            inc( PtrUInt( Row32Bit ), DstSurface^.pitch );
-          end;
-        end;
-    end;
-    if Locked then
-      SDL_UnlockSurface( DstSurface );
-  end;
-end;
-
-// Use with caution! The procedure allocates memory for TSDL_Rect and return with its pointer.
-// But you MUST free it after you don't need it anymore!!!
-
-function PSDLRect( aLeft, aTop, aWidth, aHeight : integer ) : PSDL_Rect;
-var
-  Rect         : PSDL_Rect;
-begin
-  New( Rect );
-  with Rect^ do
-  begin
-    x := aLeft;
-    y := aTop;
-    w := aWidth;
-    h := aHeight;
-  end;
-  Result := Rect;
-end;
-
-function SDLRect( aLeft, aTop, aWidth, aHeight : integer ) : TSDL_Rect;
-begin
-  with result do
-  begin
-    x := aLeft;
-    y := aTop;
-    w := aWidth;
-    h := aHeight;
-  end;
-end;
-
-function SDLRect( aRect : TRect ) : TSDL_Rect;
-begin
-  with aRect do
-    result := SDLRect( Left, Top, Right - Left, Bottom - Top );
-end;
-
-procedure SDL_Stretch8( Surface, Dst_Surface : PSDL_Surface; x1, x2, y1, y2, yr, yw,
-  depth : integer );
-var
-  dx, dy, e, d, dx2 : integer;
-  src_pitch, dst_pitch : uint16;
-  src_pixels, dst_pixels : PUint8;
-begin
-  if ( yw >= dst_surface^.h ) then
-    exit;
-  dx := ( x2 - x1 );
-  dy := ( y2 - y1 );
-  dy := dy shl 1;
-  e := dy - dx;
-  dx2 := dx shl 1;
-  src_pitch := Surface^.pitch;
-  dst_pitch := dst_surface^.pitch;
-  src_pixels := PUint8( PtrUInt( Surface^.pixels ) + yr * src_pitch + y1 * depth );
-  dst_pixels := PUint8( PtrUInt( dst_surface^.pixels ) + yw * dst_pitch + x1 *
-    depth );
-  for d := 0 to dx - 1 do
-  begin
-    move( src_pixels^, dst_pixels^, depth );
-    while ( e >= 0 ) do
-    begin
-      inc( src_pixels, depth );
-      e := e - dx2;
-    end;
-    inc( dst_pixels, depth );
-    e := e + dy;
-  end;
-end;
-
-function sign( x : integer ) : integer;
-begin
-  if x > 0 then
-    result := 1
-  else
-    result := -1;
-end;
-
-// Stretches a part of a surface
-
-function SDL_ScaleSurfaceRect( SrcSurface : PSDL_Surface; SrcX1, SrcY1, SrcW, SrcH,
-  Width, Height : integer ) : PSDL_Surface;
-var
-  dst_surface  : PSDL_Surface;
-  dx, dy, e, d, dx2, srcx2, srcy2 : integer;
-  destx1, desty1 : integer;
-begin
-  srcx2 := srcx1 + SrcW;
-  srcy2 := srcy1 + SrcH;
-  result := nil;
-  destx1 := 0;
-  desty1 := 0;
-  dx := abs( integer( Height - desty1 ) );
-  dy := abs( integer( SrcY2 - SrcY1 ) );
-  e := ( dy shl 1 ) - dx;
-  dx2 := dx shl 1;
-  dy := dy shl 1;
-  dst_surface := SDL_CreateRGBSurface( SDL_HWPALETTE, width - destx1, Height -
-    desty1,
-    SrcSurface^.Format^.BitsPerPixel,
-    SrcSurface^.Format^.RMask,
-    SrcSurface^.Format^.GMask,
-    SrcSurface^.Format^.BMask,
-    SrcSurface^.Format^.AMask );
-  if ( dst_surface^.format^.BytesPerPixel = 1 ) then
-    SDL_SetColors( dst_surface, @SrcSurface^.format^.palette^.colors^[ 0 ], 0, 256 );
-  SDL_SetColorKey( dst_surface, sdl_srccolorkey, SrcSurface^.format^.colorkey );
-  if ( SDL_MustLock( dst_surface ) ) then
-    if ( SDL_LockSurface( dst_surface ) < 0 ) then
-      exit;
-  for d := 0 to dx - 1 do
-  begin
-    SDL_Stretch8( SrcSurface, dst_surface, destx1, Width, SrcX1, SrcX2, SrcY1, desty1,
-      SrcSurface^.format^.BytesPerPixel );
-    while e >= 0 do
-    begin
-      inc( SrcY1 );
-      e := e - dx2;
-    end;
-    inc( desty1 );
-    e := e + dy;
-  end;
-  if SDL_MUSTLOCK( dst_surface ) then
-    SDL_UnlockSurface( dst_surface );
-  result := dst_surface;
-end;
-
-procedure SDL_MoveLine( Surface : PSDL_Surface; x1, x2, y1, xofs, depth : integer );
-var
-  src_pixels, dst_pixels : PUint8;
-  i            : integer;
-begin
-  src_pixels := PUint8( PtrUInt( Surface^.pixels ) + Surface^.w * y1 * depth + x2 *
-    depth );
-  dst_pixels := PUint8( PtrUInt( Surface^.pixels ) + Surface^.w * y1 * depth + ( x2
-    + xofs ) * depth );
-  for i := x2 downto x1 do
-  begin
-    move( src_pixels^, dst_pixels^, depth );
-    dec( src_pixels );
-    dec( dst_pixels );
-  end;
-end;
-{ Return the pixel value at (x, y)
-NOTE: The surface must be locked before calling this! }
-
-function SDL_GetPixel( SrcSurface : PSDL_Surface; x : integer; y : integer ) : Uint32;
-var
-  bpp          : UInt32;
-  p            : PInteger;
-begin
-  bpp := SrcSurface.format.BytesPerPixel;
-  // Here p is the address to the pixel we want to retrieve
-  p := Pointer( PtrUInt( SrcSurface.pixels ) + UInt32( y ) * SrcSurface.pitch + UInt32( x ) *
-    bpp );
-  case bpp of
-    1 : result := PUint8( p )^;
-    2 : result := PUint16( p )^;
-    3 :
-      if ( SDL_BYTEORDER = SDL_BIG_ENDIAN ) then
-        result := PUInt8Array( p )[ 0 ] shl 16 or PUInt8Array( p )[ 1 ] shl 8 or
-          PUInt8Array( p )[ 2 ]
-      else
-        result := PUInt8Array( p )[ 0 ] or PUInt8Array( p )[ 1 ] shl 8 or
-          PUInt8Array( p )[ 2 ] shl 16;
-    4 : result := PUint32( p )^;
-  else
-    result := 0; // shouldn't happen, but avoids warnings
-  end;
-end;
-{ Set the pixel at (x, y) to the given value
-  NOTE: The surface must be locked before calling this! }
-
-procedure SDL_PutPixel( DstSurface : PSDL_Surface; x : integer; y : integer; pixel :
-  Uint32 );
-var
-  bpp          : UInt32;
-  p            : PInteger;
-begin
-  bpp := DstSurface.format.BytesPerPixel;
-  p := Pointer( PtrUInt( DstSurface.pixels ) + UInt32( y ) * DstSurface.pitch + UInt32( x )
-    * bpp );
-  case bpp of
-    1 : PUint8( p )^ := pixel;
-    2 : PUint16( p )^ := pixel;
-    3 :
-      if ( SDL_BYTEORDER = SDL_BIG_ENDIAN ) then
-      begin
-        PUInt8Array( p )[ 0 ] := ( pixel shr 16 ) and $FF;
-        PUInt8Array( p )[ 1 ] := ( pixel shr 8 ) and $FF;
-        PUInt8Array( p )[ 2 ] := pixel and $FF;
-      end
-      else
-      begin
-        PUInt8Array( p )[ 0 ] := pixel and $FF;
-        PUInt8Array( p )[ 1 ] := ( pixel shr 8 ) and $FF;
-        PUInt8Array( p )[ 2 ] := ( pixel shr 16 ) and $FF;
-      end;
-    4 :
-      PUint32( p )^ := pixel;
-  end;
-end;
-
-procedure SDL_ScrollY( DstSurface : PSDL_Surface; DifY : integer );
-var
-  r1, r2       : TSDL_Rect;
-  //buffer: PSDL_Surface;
-  YPos         : Integer;
-begin
-  if ( DstSurface <> nil ) and ( DifY <> 0 ) then
-  begin
-    //if DifY > 0 then // going up
-    //begin
-    ypos := 0;
-    r1.x := 0;
-    r2.x := 0;
-    r1.w := DstSurface.w;
-    r2.w := DstSurface.w;
-    r1.h := DifY;
-    r2.h := DifY;
-    while ypos < DstSurface.h do
-    begin
-      r1.y := ypos;
-      r2.y := ypos + DifY;
-      SDL_BlitSurface( DstSurface, @r2, DstSurface, @r1 );
-      ypos := ypos + DifY;
-    end;
-    //end
-    //else
-    //begin // Going Down
-    //end;
-  end;
-end;
-
-{procedure SDL_ScrollY(Surface: PSDL_Surface; DifY: integer);
-var
-  r1, r2: TSDL_Rect;
-  buffer: PSDL_Surface;
-begin
-  if (Surface <> nil) and (Dify <> 0) then
-  begin
-    buffer := SDL_CreateRGBSurface(SDL_HWSURFACE, (Surface^.w - DifY) * 2,
-      Surface^.h * 2,
-      Surface^.Format^.BitsPerPixel, 0, 0, 0, 0);
-    if buffer <> nil then
-    begin
-      if (buffer^.format^.BytesPerPixel = 1) then
-        SDL_SetColors(buffer, @Surface^.format^.palette^.colors^[0], 0, 256);
-      r1 := SDLRect(0, DifY, buffer^.w, buffer^.h);
-      r2 := SDLRect(0, 0, buffer^.w, buffer^.h);
-      SDL_BlitSurface(Surface, @r1, buffer, @r2);
-      SDL_BlitSurface(buffer, @r2, Surface, @r2);
-      SDL_FreeSurface(buffer);
-    end;
-  end;
-end;}
-
-procedure SDL_ScrollX( DstSurface : PSDL_Surface; DifX : integer );
-var
-  r1, r2       : TSDL_Rect;
-  buffer       : PSDL_Surface;
-begin
-  if ( DstSurface <> nil ) and ( DifX <> 0 ) then
-  begin
-    buffer := SDL_CreateRGBSurface( SDL_HWSURFACE, ( DstSurface^.w - DifX ) * 2,
-      DstSurface^.h * 2,
-      DstSurface^.Format^.BitsPerPixel,
-      DstSurface^.Format^.RMask,
-      DstSurface^.Format^.GMask,
-      DstSurface^.Format^.BMask,
-      DstSurface^.Format^.AMask );
-    if buffer <> nil then
-    begin
-      if ( buffer^.format^.BytesPerPixel = 1 ) then
-        SDL_SetColors( buffer, @DstSurface^.format^.palette^.colors^[ 0 ], 0, 256 );
-      r1 := SDLRect( DifX, 0, buffer^.w, buffer^.h );
-      r2 := SDLRect( 0, 0, buffer^.w, buffer^.h );
-      SDL_BlitSurface( DstSurface, @r1, buffer, @r2 );
-      SDL_BlitSurface( buffer, @r2, DstSurface, @r2 );
-      SDL_FreeSurface( buffer );
-    end;
-  end;
-end;
-
-procedure SDL_RotateRad( DstSurface, SrcSurface : PSDL_Surface; SrcRect :
-  PSDL_Rect; DestX, DestY, OffsetX, OffsetY : Integer; Angle : Single );
-var
-  aSin, aCos   : Single;
-  MX, MY, DX, DY, NX, NY, SX, SY, OX, OY, Width, Height, TX, TY, RX, RY, ROX, ROY : Integer;
-  Colour, TempTransparentColour : UInt32;
-  MAXX, MAXY   : Integer;
-begin
-  // Rotate the surface to the target surface.
-  TempTransparentColour := SrcSurface.format.colorkey;
-  {if srcRect.w > srcRect.h then
-  begin
-    Width := srcRect.w;
-    Height := srcRect.w;
-  end
-  else
-  begin
-    Width := srcRect.h;
-    Height := srcRect.h;
-  end; }
-
-  maxx := DstSurface.w;
-  maxy := DstSurface.h;
-  aCos := cos( Angle );
-  aSin := sin( Angle );
-
-  Width := round( abs( srcrect.h * acos ) + abs( srcrect.w * asin ) );
-  Height := round( abs( srcrect.h * asin ) + abs( srcrect.w * acos ) );
-
-  OX := Width div 2;
-  OY := Height div 2; ;
-  MX := ( srcRect.x + ( srcRect.x + srcRect.w ) ) div 2;
-  MY := ( srcRect.y + ( srcRect.y + srcRect.h ) ) div 2;
-  ROX := ( -( srcRect.w div 2 ) ) + Offsetx;
-  ROY := ( -( srcRect.h div 2 ) ) + OffsetY;
-  Tx := ox + round( ROX * aSin - ROY * aCos );
-  Ty := oy + round( ROY * aSin + ROX * aCos );
-  SX := 0;
-  for DX := DestX - TX to DestX - TX + ( width ) do
-  begin
-    Inc( SX );
-    SY := 0;
-    for DY := DestY - TY to DestY - TY + ( Height ) do
-    begin
-      RX := SX - OX;
-      RY := SY - OY;
-      NX := round( mx + RX * aSin + RY * aCos ); //
-      NY := round( my + RY * aSin - RX * aCos ); //
-      // Used for testing only
-     //SDL_PutPixel(DestSurface.SDLSurfacePointer,DX,DY,0);
-      if ( ( DX > 0 ) and ( DX < MAXX ) ) and ( ( DY > 0 ) and ( DY < MAXY ) ) then
-      begin
-        if ( NX >= srcRect.x ) and ( NX <= srcRect.x + srcRect.w ) then
-        begin
-          if ( NY >= srcRect.y ) and ( NY <= srcRect.y + srcRect.h ) then
-          begin
-            Colour := SDL_GetPixel( SrcSurface, NX, NY );
-            if Colour <> TempTransparentColour then
-            begin
-              SDL_PutPixel( DstSurface, DX, DY, Colour );
-            end;
-          end;
-        end;
-      end;
-      inc( SY );
-    end;
-  end;
-end;
-
-procedure SDL_RotateDeg( DstSurface, SrcSurface : PSDL_Surface; SrcRect :
-  PSDL_Rect; DestX, DestY, OffsetX, OffsetY : Integer; Angle : Integer );
-begin
-  SDL_RotateRad( DstSurface, SrcSurface, SrcRect, DestX, DestY, OffsetX, OffsetY, DegToRad( Angle ) );
-end;
-
-function ValidateSurfaceRect( DstSurface : PSDL_Surface; dstrect : PSDL_Rect ) : TSDL_Rect;
-var
-  RealRect     : TSDL_Rect;
-  OutOfRange   : Boolean;
-begin
-  OutOfRange := false;
-  if dstrect = nil then
-  begin
-    RealRect.x := 0;
-    RealRect.y := 0;
-    RealRect.w := DstSurface.w;
-    RealRect.h := DstSurface.h;
-  end
-  else
-  begin
-    if dstrect.x < DstSurface.w then
-    begin
-      RealRect.x := dstrect.x;
-    end
-    else if dstrect.x < 0 then
-    begin
-      realrect.x := 0;
-    end
-    else
-    begin
-      OutOfRange := True;
-    end;
-    if dstrect.y < DstSurface.h then
-    begin
-      RealRect.y := dstrect.y;
-    end
-    else if dstrect.y < 0 then
-    begin
-      realrect.y := 0;
-    end
-    else
-    begin
-      OutOfRange := True;
-    end;
-    if OutOfRange = False then
-    begin
-      if realrect.x + dstrect.w <= DstSurface.w then
-      begin
-        RealRect.w := dstrect.w;
-      end
-      else
-      begin
-        RealRect.w := dstrect.w - realrect.x;
-      end;
-      if realrect.y + dstrect.h <= DstSurface.h then
-      begin
-        RealRect.h := dstrect.h;
-      end
-      else
-      begin
-        RealRect.h := dstrect.h - realrect.y;
-      end;
-    end;
-  end;
-  if OutOfRange = False then
-  begin
-    result := realrect;
-  end
-  else
-  begin
-    realrect.w := 0;
-    realrect.h := 0;
-    realrect.x := 0;
-    realrect.y := 0;
-    result := realrect;
-  end;
-end;
-
-procedure SDL_FillRectAdd( DstSurface : PSDL_Surface; dstrect : PSDL_Rect; color : UInt32 );
-var
-  RealRect     : TSDL_Rect;
-  Addr         : pointer;
-  ModX, BPP    : cardinal;
-  x, y, R, G, B, SrcColor : cardinal;
-begin
-  RealRect := ValidateSurfaceRect( DstSurface, DstRect );
-  if ( RealRect.w > 0 ) and ( RealRect.h > 0 ) then
-  begin
-    SDL_LockSurface( DstSurface );
-    BPP := DstSurface.format.BytesPerPixel;
-    with DstSurface^ do
-    begin
-      Addr := pointer( PtrUInt( pixels ) + UInt32( RealRect.y ) * pitch + UInt32( RealRect.x ) * BPP );
-      ModX := Pitch - UInt32( RealRect.w ) * BPP;
-    end;
-    case DstSurface.format.BitsPerPixel of
-      8 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $E0 + Color and $E0;
-              G := SrcColor and $1C + Color and $1C;
-              B := SrcColor and $03 + Color and $03;
-              if R > $E0 then
-                R := $E0;
-              if G > $1C then
-                G := $1C;
-              if B > $03 then
-                B := $03;
-              PUInt8( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      15 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $7C00 + Color and $7C00;
-              G := SrcColor and $03E0 + Color and $03E0;
-              B := SrcColor and $001F + Color and $001F;
-              if R > $7C00 then
-                R := $7C00;
-              if G > $03E0 then
-                G := $03E0;
-              if B > $001F then
-                B := $001F;
-              PUInt16( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      16 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $F800 + Color and $F800;
-              G := SrcColor and $07C0 + Color and $07C0;
-              B := SrcColor and $001F + Color and $001F;
-              if R > $F800 then
-                R := $F800;
-              if G > $07C0 then
-                G := $07C0;
-              if B > $001F then
-                B := $001F;
-              PUInt16( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      24 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $00FF0000 + Color and $00FF0000;
-              G := SrcColor and $0000FF00 + Color and $0000FF00;
-              B := SrcColor and $000000FF + Color and $000000FF;
-              if R > $FF0000 then
-                R := $FF0000;
-              if G > $00FF00 then
-                G := $00FF00;
-              if B > $0000FF then
-                B := $0000FF;
-              PUInt32( Addr )^ := SrcColor and $FF000000 or R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      32 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $00FF0000 + Color and $00FF0000;
-              G := SrcColor and $0000FF00 + Color and $0000FF00;
-              B := SrcColor and $000000FF + Color and $000000FF;
-              if R > $FF0000 then
-                R := $FF0000;
-              if G > $00FF00 then
-                G := $00FF00;
-              if B > $0000FF then
-                B := $0000FF;
-              PUInt32( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-    end;
-    SDL_UnlockSurface( DstSurface );
-  end;
-end;
-
-procedure SDL_FillRectSub( DstSurface : PSDL_Surface; dstrect : PSDL_Rect; color : UInt32 );
-var
-  RealRect     : TSDL_Rect;
-  Addr         : pointer;
-  ModX, BPP    : cardinal;
-  x, y, R, G, B, SrcColor : cardinal;
-begin
-  RealRect := ValidateSurfaceRect( DstSurface, DstRect );
-  if ( RealRect.w > 0 ) and ( RealRect.h > 0 ) then
-  begin
-    SDL_LockSurface( DstSurface );
-    BPP := DstSurface.format.BytesPerPixel;
-    with DstSurface^ do
-    begin
-      Addr := pointer( PtrUInt( pixels ) + UInt32( RealRect.y ) * pitch + UInt32( RealRect.x ) * BPP );
-      ModX := Pitch - UInt32( RealRect.w ) * BPP;
-    end;
-    case DstSurface.format.BitsPerPixel of
-      8 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $E0 - Color and $E0;
-              G := SrcColor and $1C - Color and $1C;
-              B := SrcColor and $03 - Color and $03;
-              if R > $E0 then
-                R := 0;
-              if G > $1C then
-                G := 0;
-              if B > $03 then
-                B := 0;
-              PUInt8( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      15 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $7C00 - Color and $7C00;
-              G := SrcColor and $03E0 - Color and $03E0;
-              B := SrcColor and $001F - Color and $001F;
-              if R > $7C00 then
-                R := 0;
-              if G > $03E0 then
-                G := 0;
-              if B > $001F then
-                B := 0;
-              PUInt16( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      16 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $F800 - Color and $F800;
-              G := SrcColor and $07C0 - Color and $07C0;
-              B := SrcColor and $001F - Color and $001F;
-              if R > $F800 then
-                R := 0;
-              if G > $07C0 then
-                G := 0;
-              if B > $001F then
-                B := 0;
-              PUInt16( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      24 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $00FF0000 - Color and $00FF0000;
-              G := SrcColor and $0000FF00 - Color and $0000FF00;
-              B := SrcColor and $000000FF - Color and $000000FF;
-              if R > $FF0000 then
-                R := 0;
-              if G > $00FF00 then
-                G := 0;
-              if B > $0000FF then
-                B := 0;
-              PUInt32( Addr )^ := SrcColor and $FF000000 or R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-      32 :
-        begin
-          for y := 0 to RealRect.h - 1 do
-          begin
-            for x := 0 to RealRect.w - 1 do
-            begin
-              SrcColor := PUInt32( Addr )^;
-              R := SrcColor and $00FF0000 - Color and $00FF0000;
-              G := SrcColor and $0000FF00 - Color and $0000FF00;
-              B := SrcColor and $000000FF - Color and $000000FF;
-              if R > $FF0000 then
-                R := 0;
-              if G > $00FF00 then
-                G := 0;
-              if B > $0000FF then
-                B := 0;
-              PUInt32( Addr )^ := R or G or B;
-              inc( PtrUInt( Addr ), BPP );
-            end;
-            inc( PtrUInt( Addr ), ModX );
-          end;
-        end;
-    end;
-    SDL_UnlockSurface( DstSurface );
-  end;
-end;
-
-procedure SDL_GradientFillRect( DstSurface : PSDL_Surface; const Rect : PSDL_Rect; const StartColor, EndColor : TSDL_Color; const Style : TGradientStyle );
-var
-  FBC          : array[ 0..255 ] of Cardinal;
-  // temp vars
-  i, YR, YG, YB, SR, SG, SB, DR, DG, DB : Integer;
-
-  TempStepV, TempStepH : Single;
-  TempLeft, TempTop, TempHeight, TempWidth : integer;
-  TempRect     : TSDL_Rect;
-
-begin
-  // calc FBC
-  YR := StartColor.r;
-  YG := StartColor.g;
-  YB := StartColor.b;
-  SR := YR;
-  SG := YG;
-  SB := YB;
-  DR := EndColor.r - SR;
-  DG := EndColor.g - SG;
-  DB := EndColor.b - SB;
-
-  for i := 0 to 255 do
-  begin
-    FBC[ i ] := SDL_MapRGB( DstSurface.format, YR, YG, YB );
-    YR := SR + round( DR / 255 * i );
-    YG := SG + round( DG / 255 * i );
-    YB := SB + round( DB / 255 * i );
-  end;
-
-  //  if aStyle = 1 then begin
-  TempStepH := Rect.w / 255;
-  TempStepV := Rect.h / 255;
-  TempHeight := Trunc( TempStepV + 1 );
-  TempWidth := Trunc( TempStepH + 1 );
-  TempTop := 0;
-  TempLeft := 0;
-  TempRect.x := Rect.x;
-  TempRect.y := Rect.y;
-  TempRect.h := Rect.h;
-  TempRect.w := Rect.w;
-
-  case Style of
-    gsHorizontal :
-      begin
-        TempRect.h := TempHeight;
-        for i := 0 to 255 do
-        begin
-          TempRect.y := Rect.y + TempTop;
-          SDL_FillRect( DstSurface, @TempRect, FBC[ i ] );
-          TempTop := Trunc( TempStepV * i );
-        end;
-      end;
-    gsVertical :
-      begin
-        TempRect.w := TempWidth;
-        for i := 0 to 255 do
-        begin
-          TempRect.x := Rect.x + TempLeft;
-          SDL_FillRect( DstSurface, @TempRect, FBC[ i ] );
-          TempLeft := Trunc( TempStepH * i );
-        end;
-      end;
-  end;
-end;
-
-procedure SDL_2xBlit( Src, Dest : PSDL_Surface );
-var
-  ReadAddr, WriteAddr, ReadRow, WriteRow : PtrUInt;
-  SrcPitch, DestPitch, x, y : UInt32;
-begin
-  if ( Src = nil ) or ( Dest = nil ) then
-    exit;
-  if ( Src.w shl 1 ) < Dest.w then
-    exit;
-  if ( Src.h shl 1 ) < Dest.h then
-    exit;
-
-  if SDL_MustLock( Src ) then
-    SDL_LockSurface( Src );
-  if SDL_MustLock( Dest ) then
-    SDL_LockSurface( Dest );
-
-  ReadRow := PtrUInt( Src.Pixels );
-  WriteRow := PtrUInt( Dest.Pixels );
-
-  SrcPitch := Src.pitch;
-  DestPitch := Dest.pitch;
-
-  case Src.format.BytesPerPixel of
-    1 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt8( WriteAddr )^ := PUInt8( ReadAddr )^;
-          PUInt8( WriteAddr + 1 )^ := PUInt8( ReadAddr )^;
-          PUInt8( WriteAddr + DestPitch )^ := PUInt8( ReadAddr )^;
-          PUInt8( WriteAddr + DestPitch + 1 )^ := PUInt8( ReadAddr )^;
-          inc( ReadAddr );
-          inc( WriteAddr, 2 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    2 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt16( WriteAddr )^ := PUInt16( ReadAddr )^;
-          PUInt16( WriteAddr + 2 )^ := PUInt16( ReadAddr )^;
-          PUInt16( WriteAddr + DestPitch )^ := PUInt16( ReadAddr )^;
-          PUInt16( WriteAddr + DestPitch + 2 )^ := PUInt16( ReadAddr )^;
-          inc( ReadAddr, 2 );
-          inc( WriteAddr, 4 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    3 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt32( WriteAddr )^ := ( PUInt32( WriteAddr )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          PUInt32( WriteAddr + 3 )^ := ( PUInt32( WriteAddr + 3 )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          PUInt32( WriteAddr + DestPitch )^ := ( PUInt32( WriteAddr + DestPitch )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          PUInt32( WriteAddr + DestPitch + 3 )^ := ( PUInt32( WriteAddr + DestPitch + 3 )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          inc( ReadAddr, 3 );
-          inc( WriteAddr, 6 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    4 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt32( WriteAddr )^ := PUInt32( ReadAddr )^;
-          PUInt32( WriteAddr + 4 )^ := PUInt32( ReadAddr )^;
-          PUInt32( WriteAddr + DestPitch )^ := PUInt32( ReadAddr )^;
-          PUInt32( WriteAddr + DestPitch + 4 )^ := PUInt32( ReadAddr )^;
-          inc( ReadAddr, 4 );
-          inc( WriteAddr, 8 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-  end;
-
-  if SDL_MustLock( Src ) then
-    SDL_UnlockSurface( Src );
-  if SDL_MustLock( Dest ) then
-    SDL_UnlockSurface( Dest );
-end;
-
-procedure SDL_Scanline2xBlit( Src, Dest : PSDL_Surface );
-var
-  ReadAddr, WriteAddr, ReadRow, WriteRow : PtrUInt;
-  SrcPitch, DestPitch, x, y : UInt32;
-begin
-  if ( Src = nil ) or ( Dest = nil ) then
-    exit;
-  if ( Src.w shl 1 ) < Dest.w then
-    exit;
-  if ( Src.h shl 1 ) < Dest.h then
-    exit;
-
-  if SDL_MustLock( Src ) then
-    SDL_LockSurface( Src );
-  if SDL_MustLock( Dest ) then
-    SDL_LockSurface( Dest );
-
-  ReadRow := PtrUInt( Src.Pixels );
-  WriteRow := PtrUInt( Dest.Pixels );
-
-  SrcPitch := Src.pitch;
-  DestPitch := Dest.pitch;
-
-  case Src.format.BytesPerPixel of
-    1 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt8( WriteAddr )^ := PUInt8( ReadAddr )^;
-          PUInt8( WriteAddr + 1 )^ := PUInt8( ReadAddr )^;
-          inc( ReadAddr );
-          inc( WriteAddr, 2 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    2 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt16( WriteAddr )^ := PUInt16( ReadAddr )^;
-          PUInt16( WriteAddr + 2 )^ := PUInt16( ReadAddr )^;
-          inc( ReadAddr, 2 );
-          inc( WriteAddr, 4 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    3 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt32( WriteAddr )^ := ( PUInt32( WriteAddr )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          PUInt32( WriteAddr + 3 )^ := ( PUInt32( WriteAddr + 3 )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          inc( ReadAddr, 3 );
-          inc( WriteAddr, 6 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    4 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          PUInt32( WriteAddr )^ := PUInt32( ReadAddr )^;
-          PUInt32( WriteAddr + 4 )^ := PUInt32( ReadAddr )^;
-          inc( ReadAddr, 4 );
-          inc( WriteAddr, 8 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-  end;
-
-  if SDL_MustLock( Src ) then
-    SDL_UnlockSurface( Src );
-  if SDL_MustLock( Dest ) then
-    SDL_UnlockSurface( Dest );
-end;
-
-procedure SDL_50Scanline2xBlit( Src, Dest : PSDL_Surface );
-var
-  ReadAddr, WriteAddr, ReadRow, WriteRow : PtrUInt;
-  SrcPitch, DestPitch, x, y, Color : UInt32;
-begin
-  if ( Src = nil ) or ( Dest = nil ) then
-    exit;
-  if ( Src.w shl 1 ) < Dest.w then
-    exit;
-  if ( Src.h shl 1 ) < Dest.h then
-    exit;
-
-  if SDL_MustLock( Src ) then
-    SDL_LockSurface( Src );
-  if SDL_MustLock( Dest ) then
-    SDL_LockSurface( Dest );
-
-  ReadRow := PtrUInt( Src.Pixels );
-  WriteRow := PtrUInt( Dest.Pixels );
-
-  SrcPitch := Src.pitch;
-  DestPitch := Dest.pitch;
-
-  case Src.format.BitsPerPixel of
-    8 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          Color := PUInt8( ReadAddr )^;
-          PUInt8( WriteAddr )^ := Color;
-          PUInt8( WriteAddr + 1 )^ := Color;
-          Color := ( Color shr 1 ) and $6D; {%01101101}
-          PUInt8( WriteAddr + DestPitch )^ := Color;
-          PUInt8( WriteAddr + DestPitch + 1 )^ := Color;
-          inc( ReadAddr );
-          inc( WriteAddr, 2 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    15 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          Color := PUInt16( ReadAddr )^;
-          PUInt16( WriteAddr )^ := Color;
-          PUInt16( WriteAddr + 2 )^ := Color;
-          Color := ( Color shr 1 ) and $3DEF; {%0011110111101111}
-          PUInt16( WriteAddr + DestPitch )^ := Color;
-          PUInt16( WriteAddr + DestPitch + 2 )^ := Color;
-          inc( ReadAddr, 2 );
-          inc( WriteAddr, 4 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    16 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          Color := PUInt16( ReadAddr )^;
-          PUInt16( WriteAddr )^ := Color;
-          PUInt16( WriteAddr + 2 )^ := Color;
-          Color := ( Color shr 1 ) and $7BEF; {%0111101111101111}
-          PUInt16( WriteAddr + DestPitch )^ := Color;
-          PUInt16( WriteAddr + DestPitch + 2 )^ := Color;
-          inc( ReadAddr, 2 );
-          inc( WriteAddr, 4 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    24 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          Color := ( PUInt32( WriteAddr )^ and $FF000000 ) or ( PUInt32( ReadAddr )^ and $00FFFFFF );
-          PUInt32( WriteAddr )^ := Color;
-          PUInt32( WriteAddr + 3 )^ := Color;
-          Color := ( Color shr 1 ) and $007F7F7F; {%011111110111111101111111}
-          PUInt32( WriteAddr + DestPitch )^ := Color;
-          PUInt32( WriteAddr + DestPitch + 3 )^ := Color;
-          inc( ReadAddr, 3 );
-          inc( WriteAddr, 6 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-    32 : for y := 1 to Src.h do
-      begin
-        ReadAddr := ReadRow;
-        WriteAddr := WriteRow;
-        for x := 1 to Src.w do
-        begin
-          Color := PUInt32( ReadAddr )^;
-          PUInt32( WriteAddr )^ := Color;
-          PUInt32( WriteAddr + 4 )^ := Color;
-          Color := ( Color shr 1 ) and $7F7F7F7F;
-          PUInt32( WriteAddr + DestPitch )^ := Color;
-          PUInt32( WriteAddr + DestPitch + 4 )^ := Color;
-          inc( ReadAddr, 4 );
-          inc( WriteAddr, 8 );
-        end;
-        inc( PtrUInt( ReadRow ), SrcPitch );
-        inc( PtrUInt( WriteRow ), DestPitch * 2 );
-      end;
-  end;
-
-  if SDL_MustLock( Src ) then
-    SDL_UnlockSurface( Src );
-  if SDL_MustLock( Dest ) then
-    SDL_UnlockSurface( Dest );
-end;
-
-function SDL_PixelTestSurfaceVsRect( SrcSurface1 : PSDL_Surface; SrcRect1 :
-  PSDL_Rect; SrcRect2 : PSDL_Rect; Left1, Top1, Left2, Top2 : integer ) :
-  boolean;
-var
-  Src_Rect1, Src_Rect2 : TSDL_Rect;
-  right1, bottom1 : integer;
-  right2, bottom2 : integer;
-  Scan1Start, {Scan2Start,} ScanWidth, ScanHeight : cardinal;
-  Mod1         : cardinal;
-  Addr1        : PtrUInt;
-  BPP          : cardinal;
-  Pitch1       : cardinal;
-  TransparentColor1 : cardinal;
-  tx, ty       : cardinal;
-// StartTick    : cardinal; // Auto Removed, Unused Variable
-  Color1       : cardinal;
-begin
-  Result := false;
-  if SrcRect1 = nil then
-  begin
-    with Src_Rect1 do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface1.w;
-      h := SrcSurface1.h;
-    end;
-  end
-  else
-    Src_Rect1 := SrcRect1^;
-
-  Src_Rect2 := SrcRect2^;
-  with Src_Rect1 do
-  begin
-    Right1 := Left1 + w;
-    Bottom1 := Top1 + h;
-  end;
-  with Src_Rect2 do
-  begin
-    Right2 := Left2 + w;
-    Bottom2 := Top2 + h;
-  end;
-  if ( Left1 >= Right2 ) or ( Right1 <= Left2 ) or ( Top1 >= Bottom2 ) or ( Bottom1 <= Top2 ) then
-    exit;
-  if Left1 <= Left2 then
-  begin
-    // 1. left, 2. right
-    Scan1Start := Src_Rect1.x + Left2 - Left1;
-    //Scan2Start := Src_Rect2.x;
-    ScanWidth := Right1 - Left2;
-    with Src_Rect2 do
-      if ScanWidth > w then
-        ScanWidth := w;
-  end
-  else
-  begin
-    // 1. right, 2. left
-    Scan1Start := Src_Rect1.x;
-    //Scan2Start := Src_Rect2.x + Left1 - Left2;
-    ScanWidth := Right2 - Left1;
-    with Src_Rect1 do
-      if ScanWidth > w then
-        ScanWidth := w;
-  end;
-  with SrcSurface1^ do
-  begin
-    Pitch1 := Pitch;
-    Addr1 := PtrUInt( Pixels );
-    inc( Addr1, Pitch1 * UInt32( Src_Rect1.y ) );
-    with format^ do
-    begin
-      BPP := BytesPerPixel;
-      TransparentColor1 := colorkey;
-    end;
-  end;
-
-  Mod1 := Pitch1 - ( ScanWidth * BPP );
-
-  inc( Addr1, BPP * Scan1Start );
-
-  if Top1 <= Top2 then
-  begin
-    // 1. up, 2. down
-    ScanHeight := Bottom1 - Top2;
-    if ScanHeight > Src_Rect2.h then
-      ScanHeight := Src_Rect2.h;
-    inc( Addr1, Pitch1 * UInt32( Top2 - Top1 ) );
-  end
-  else
-  begin
-    // 1. down, 2. up
-    ScanHeight := Bottom2 - Top1;
-    if ScanHeight > Src_Rect1.h then
-      ScanHeight := Src_Rect1.h;
-
-  end;
-  case BPP of
-    1 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          if ( PByte( Addr1 )^ <> TransparentColor1 ) then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1 );
-
-        end;
-        inc( Addr1, Mod1 );
-
-      end;
-    2 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          if ( PWord( Addr1 )^ <> TransparentColor1 ) then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1, 2 );
-
-        end;
-        inc( Addr1, Mod1 );
-
-      end;
-    3 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          Color1 := PLongWord( Addr1 )^ and $00FFFFFF;
-
-          if ( Color1 <> TransparentColor1 )
-            then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1, 3 );
-
-        end;
-        inc( Addr1, Mod1 );
-
-      end;
-    4 :
-      for ty := 1 to ScanHeight do
-      begin
-        for tx := 1 to ScanWidth do
-        begin
-          if ( PLongWord( Addr1 )^ <> TransparentColor1 ) then
-          begin
-            Result := true;
-            exit;
-          end;
-          inc( Addr1, 4 );
-
-        end;
-        inc( Addr1, Mod1 );
-
-      end;
-  end;
-end;
-
-procedure SDL_ORSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-var
-{*R, *}{*G, *}{*B, *}Pixel1, Pixel2, TransparentColor : cardinal; // Auto Removed, Unused Variable (R) // Auto Removed, Unused Variable (G) // Auto Removed, Unused Variable (B)
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  Bits         : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    Bits := Format.BitsPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case bits of
-    8 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt8( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt8( DestAddr )^;
-              PUInt8( DestAddr )^ := Pixel2 or Pixel1;
-            end;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    15 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-
-              PUInt16( DestAddr )^ := Pixel2 or Pixel1;
-
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    16 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-
-              PUInt16( DestAddr )^ := Pixel2 or Pixel1;
-
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    24 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^ and $00FFFFFF;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^ and $00FFFFFF;
-
-              PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or Pixel2 or Pixel1;
-            end;
-            inc( SrcAddr, 3 );
-            inc( DestAddr, 3 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    32 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^;
-
-              PUInt32( DestAddr )^ := Pixel2 or Pixel1;
-            end;
-            inc( SrcAddr, 4 );
-            inc( DestAddr, 4 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-
-procedure SDL_ANDSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-var
-{*R, *}{*G, *}{*B, *}Pixel1, Pixel2, TransparentColor : cardinal; // Auto Removed, Unused Variable (R) // Auto Removed, Unused Variable (G) // Auto Removed, Unused Variable (B)
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  Bits         : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    Bits := Format.BitsPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case bits of
-    8 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt8( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt8( DestAddr )^;
-              PUInt8( DestAddr )^ := Pixel2 and Pixel1;
-            end;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    15 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-
-              PUInt16( DestAddr )^ := Pixel2 and Pixel1;
-
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    16 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-
-              PUInt16( DestAddr )^ := Pixel2 and Pixel1;
-
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    24 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^ and $00FFFFFF;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^ and $00FFFFFF;
-
-              PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or Pixel2 and Pixel1;
-            end;
-            inc( SrcAddr, 3 );
-            inc( DestAddr, 3 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    32 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^;
-
-              PUInt32( DestAddr )^ := Pixel2 and Pixel1;
-            end;
-            inc( SrcAddr, 4 );
-            inc( DestAddr, 4 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-
-
-
-procedure SDL_GTSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-var
-  R, G, B, Pixel1, Pixel2, TransparentColor : cardinal;
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  Bits         : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    Bits := Format.BitsPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case bits of
-    8 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt8( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt8( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                if Pixel2 and $E0 > Pixel1 and $E0 then
-                  R := Pixel2 and $E0
-                else
-                  R := Pixel1 and $E0;
-                if Pixel2 and $1C > Pixel1 and $1C then
-                  G := Pixel2 and $1C
-                else
-                  G := Pixel1 and $1C;
-                if Pixel2 and $03 > Pixel1 and $03 then
-                  B := Pixel2 and $03
-                else
-                  B := Pixel1 and $03;
-
-                if R > $E0 then
-                  R := $E0;
-                if G > $1C then
-                  G := $1C;
-                if B > $03 then
-                  B := $03;
-                PUInt8( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt8( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    15 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $7C00 > Pixel1 and $7C00 then
-                  R := Pixel2 and $7C00
-                else
-                  R := Pixel1 and $7C00;
-                if Pixel2 and $03E0 > Pixel1 and $03E0 then
-                  G := Pixel2 and $03E0
-                else
-                  G := Pixel1 and $03E0;
-                if Pixel2 and $001F > Pixel1 and $001F then
-                  B := Pixel2 and $001F
-                else
-                  B := Pixel1 and $001F;
-
-                PUInt16( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt16( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    16 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $F800 > Pixel1 and $F800 then
-                  R := Pixel2 and $F800
-                else
-                  R := Pixel1 and $F800;
-                if Pixel2 and $07E0 > Pixel1 and $07E0 then
-                  G := Pixel2 and $07E0
-                else
-                  G := Pixel1 and $07E0;
-                if Pixel2 and $001F > Pixel1 and $001F then
-                  B := Pixel2 and $001F
-                else
-                  B := Pixel1 and $001F;
-
-                PUInt16( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt16( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    24 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^ and $00FFFFFF;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^ and $00FFFFFF;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $FF0000 > Pixel1 and $FF0000 then
-                  R := Pixel2 and $FF0000
-                else
-                  R := Pixel1 and $FF0000;
-                if Pixel2 and $00FF00 > Pixel1 and $00FF00 then
-                  G := Pixel2 and $00FF00
-                else
-                  G := Pixel1 and $00FF00;
-                if Pixel2 and $0000FF > Pixel1 and $0000FF then
-                  B := Pixel2 and $0000FF
-                else
-                  B := Pixel1 and $0000FF;
-
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or ( R or G or B );
-              end
-              else
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or Pixel1;
-            end;
-            inc( SrcAddr, 3 );
-            inc( DestAddr, 3 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    32 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $FF0000 > Pixel1 and $FF0000 then
-                  R := Pixel2 and $FF0000
-                else
-                  R := Pixel1 and $FF0000;
-                if Pixel2 and $00FF00 > Pixel1 and $00FF00 then
-                  G := Pixel2 and $00FF00
-                else
-                  G := Pixel1 and $00FF00;
-                if Pixel2 and $0000FF > Pixel1 and $0000FF then
-                  B := Pixel2 and $0000FF
-                else
-                  B := Pixel1 and $0000FF;
-
-                PUInt32( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt32( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 4 );
-            inc( DestAddr, 4 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-
-
-procedure SDL_LTSurface( SrcSurface : PSDL_Surface; SrcRect : PSDL_Rect;
-  DestSurface : PSDL_Surface; DestRect : PSDL_Rect );
-var
-  R, G, B, Pixel1, Pixel2, TransparentColor : cardinal;
-  Src, Dest    : TSDL_Rect;
-  Diff         : integer;
-  SrcAddr, DestAddr : PtrUInt;
-  WorkX, WorkY : word;
-  SrcMod, DestMod : cardinal;
-  Bits         : cardinal;
-begin
-  if ( SrcSurface = nil ) or ( DestSurface = nil ) then
-    exit; // Remove this to make it faster
-  if ( SrcSurface.Format.BitsPerPixel <> DestSurface.Format.BitsPerPixel ) then
-    exit; // Remove this to make it faster
-  if SrcRect = nil then
-  begin
-    with Src do
-    begin
-      x := 0;
-      y := 0;
-      w := SrcSurface.w;
-      h := SrcSurface.h;
-    end;
-  end
-  else
-    Src := SrcRect^;
-  if DestRect = nil then
-  begin
-    Dest.x := 0;
-    Dest.y := 0;
-  end
-  else
-    Dest := DestRect^;
-  Dest.w := Src.w;
-  Dest.h := Src.h;
-  with DestSurface.Clip_Rect do
-  begin
-    // Source's right side is greater than the dest.cliprect
-    if Dest.x + Src.w > x + w then
-    begin
-      smallint( Src.w ) := x + w - Dest.x;
-      smallint( Dest.w ) := x + w - Dest.x;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's bottom side is greater than the dest.clip
-    if Dest.y + Src.h > y + h then
-    begin
-      smallint( Src.h ) := y + h - Dest.y;
-      smallint( Dest.h ) := y + h - Dest.y;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-    // Source's left side is less than the dest.clip
-    if Dest.x < x then
-    begin
-      Diff := x - Dest.x;
-      Src.x := Src.x + Diff;
-      smallint( Src.w ) := smallint( Src.w ) - Diff;
-      Dest.x := x;
-      smallint( Dest.w ) := smallint( Dest.w ) - Diff;
-      if smallint( Dest.w ) < 1 then
-        exit;
-    end;
-    // Source's Top side is less than the dest.clip
-    if Dest.y < y then
-    begin
-      Diff := y - Dest.y;
-      Src.y := Src.y + Diff;
-      smallint( Src.h ) := smallint( Src.h ) - Diff;
-      Dest.y := y;
-      smallint( Dest.h ) := smallint( Dest.h ) - Diff;
-      if smallint( Dest.h ) < 1 then
-        exit;
-    end;
-  end;
-  with SrcSurface^ do
-  begin
-    SrcAddr := PtrUInt( Pixels ) + UInt32( Src.y ) * Pitch + UInt32( Src.x ) *
-      Format.BytesPerPixel;
-    SrcMod := Pitch - Src.w * Format.BytesPerPixel;
-    TransparentColor := Format.colorkey;
-  end;
-  with DestSurface^ do
-  begin
-    DestAddr := PtrUInt( Pixels ) + UInt32( Dest.y ) * Pitch + UInt32( Dest.x ) *
-      Format.BytesPerPixel;
-    DestMod := Pitch - Dest.w * Format.BytesPerPixel;
-    Bits := Format.BitsPerPixel;
-  end;
-  SDL_LockSurface( SrcSurface );
-  SDL_LockSurface( DestSurface );
-  WorkY := Src.h;
-  case bits of
-    8 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt8( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt8( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-                if Pixel2 and $E0 < Pixel1 and $E0 then
-                  R := Pixel2 and $E0
-                else
-                  R := Pixel1 and $E0;
-                if Pixel2 and $1C < Pixel1 and $1C then
-                  G := Pixel2 and $1C
-                else
-                  G := Pixel1 and $1C;
-                if Pixel2 and $03 < Pixel1 and $03 then
-                  B := Pixel2 and $03
-                else
-                  B := Pixel1 and $03;
-
-                if R > $E0 then
-                  R := $E0;
-                if G > $1C then
-                  G := $1C;
-                if B > $03 then
-                  B := $03;
-                PUInt8( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt8( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr );
-            inc( DestAddr );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    15 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $7C00 < Pixel1 and $7C00 then
-                  R := Pixel2 and $7C00
-                else
-                  R := Pixel1 and $7C00;
-                if Pixel2 and $03E0 < Pixel1 and $03E0 then
-                  G := Pixel2 and $03E0
-                else
-                  G := Pixel1 and $03E0;
-                if Pixel2 and $001F < Pixel1 and $001F then
-                  B := Pixel2 and $001F
-                else
-                  B := Pixel1 and $001F;
-
-                PUInt16( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt16( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    16 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt16( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt16( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $F800 < Pixel1 and $F800 then
-                  R := Pixel2 and $F800
-                else
-                  R := Pixel1 and $F800;
-                if Pixel2 and $07E0 < Pixel1 and $07E0 then
-                  G := Pixel2 and $07E0
-                else
-                  G := Pixel1 and $07E0;
-                if Pixel2 and $001F < Pixel1 and $001F then
-                  B := Pixel2 and $001F
-                else
-                  B := Pixel1 and $001F;
-
-                PUInt16( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt16( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 2 );
-            inc( DestAddr, 2 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    24 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^ and $00FFFFFF;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^ and $00FFFFFF;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $FF0000 < Pixel1 and $FF0000 then
-                  R := Pixel2 and $FF0000
-                else
-                  R := Pixel1 and $FF0000;
-                if Pixel2 and $00FF00 < Pixel1 and $00FF00 then
-                  G := Pixel2 and $00FF00
-                else
-                  G := Pixel1 and $00FF00;
-                if Pixel2 and $0000FF < Pixel1 and $0000FF then
-                  B := Pixel2 and $0000FF
-                else
-                  B := Pixel1 and $0000FF;
-
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or ( R or G or B );
-              end
-              else
-                PUInt32( DestAddr )^ := PUInt32( DestAddr )^ and $FF000000 or Pixel1;
-            end;
-            inc( SrcAddr, 3 );
-            inc( DestAddr, 3 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-    32 :
-      begin
-        repeat
-          WorkX := Src.w;
-          repeat
-            Pixel1 := PUInt32( SrcAddr )^;
-            if ( Pixel1 <> TransparentColor ) and ( Pixel1 <> 0 ) then
-            begin
-              Pixel2 := PUInt32( DestAddr )^;
-              if Pixel2 > 0 then
-              begin
-
-                if Pixel2 and $FF0000 < Pixel1 and $FF0000 then
-                  R := Pixel2 and $FF0000
-                else
-                  R := Pixel1 and $FF0000;
-                if Pixel2 and $00FF00 < Pixel1 and $00FF00 then
-                  G := Pixel2 and $00FF00
-                else
-                  G := Pixel1 and $00FF00;
-                if Pixel2 and $0000FF < Pixel1 and $0000FF then
-                  B := Pixel2 and $0000FF
-                else
-                  B := Pixel1 and $0000FF;
-
-                PUInt32( DestAddr )^ := R or G or B;
-              end
-              else
-                PUInt32( DestAddr )^ := Pixel1;
-            end;
-            inc( SrcAddr, 4 );
-            inc( DestAddr, 4 );
-            dec( WorkX );
-          until WorkX = 0;
-          inc( SrcAddr, SrcMod );
-          inc( DestAddr, DestMod );
-          dec( WorkY );
-        until WorkY = 0;
-      end;
-  end;
-  SDL_UnlockSurface( SrcSurface );
-  SDL_UnlockSurface( DestSurface );
-end;
-
-// Will clip the x1,x2,y1,x2 params to the ClipRect provided
-
-function SDL_ClipLine( var x1, y1, x2, y2 : Integer; ClipRect : PSDL_Rect ) : boolean;
-var
-  tflag, flag1, flag2 : word;
-  txy, xedge, yedge : Integer;
-  slope        : single;
-
-  function ClipCode( x, y : Integer ) : word;
-  begin
-    Result := 0;
-    if x < ClipRect.x then
-      Result := 1;
-    if x >= ClipRect.w + ClipRect.x then
-      Result := Result or 2;
-    if y < ClipRect.y then
-      Result := Result or 4;
-    if y >= ClipRect.h + ClipRect.y then
-      Result := Result or 8;
-  end;
-
-begin
-  flag1 := ClipCode( x1, y1 );
-  flag2 := ClipCode( x2, y2 );
-  result := true;
-
-  while true do
-  begin
-    if ( flag1 or flag2 ) = 0 then
-      Exit; // all in
-
-    if ( flag1 and flag2 ) <> 0 then
-    begin
-      result := false;
-      Exit; // all out
-    end;
-
-    if flag2 = 0 then
-    begin
-      txy := x1; x1 := x2; x2 := txy;
-      txy := y1; y1 := y2; y2 := txy;
-      tflag := flag1; flag1 := flag2; flag2 := tflag;
-    end;
-
-    if ( flag2 and 3 ) <> 0 then
-    begin
-      if ( flag2 and 1 ) <> 0 then
-        xedge := ClipRect.x
-      else
-        xedge := ClipRect.w + ClipRect.x - 1; // back 1 pixel otherwise we end up in a loop
-
-      slope := ( y2 - y1 ) / ( x2 - x1 );
-      y2 := y1 + Round( slope * ( xedge - x1 ) );
-      x2 := xedge;
-    end
-    else
-    begin
-      if ( flag2 and 4 ) <> 0 then
-        yedge := ClipRect.y
-      else
-        yedge := ClipRect.h + ClipRect.y - 1; // up 1 pixel otherwise we end up in a loop
-
-      slope := ( x2 - x1 ) / ( y2 - y1 );
-      x2 := x1 + Round( slope * ( yedge - y1 ) );
-      y2 := yedge;
-    end;
-
-    flag2 := ClipCode( x2, y2 );
-  end;
-end;
-
-end.
-