unit GR32_Backends_Generic;

(* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1 or LGPL 2.1 with linking exception
 *
 * The contents of this file are 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/
 *
 * 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.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * Free Pascal modified version of the GNU Lesser General Public License
 * Version 2.1 (the "FPC modified LGPL License"), in which case the provisions
 * of this license are applicable instead of those above.
 * Please see the file LICENSE.txt for additional information concerning this
 * license.
 *
 * The Original Code is Backend Extension for Graphics32
 *
 * The Initial Developer of the Original Code is
 * Andre Beckedorf - metaException
 * Andre@metaException.de
 *
 * Portions created by the Initial Developer are Copyright (C) 2007-2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * ***** END LICENSE BLOCK ***** *)

interface

{$I GR32.inc}

uses
  SysUtils, Classes, GR32;

type
  { TMemoryBackend }
  { A backend that keeps the backing buffer entirely in memory.}

  TMemoryBackend = class(TCustomBackend)
  protected
    procedure InitializeSurface(NewWidth, NewHeight: Integer; ClearBuffer: Boolean); override;
    procedure FinalizeSurface; override;
  end;

implementation

uses
  System.IOUtils,
  GR32_LowLevel;

{$IFDEF Windows}

var
  TempPath: TFileName;

resourcestring
  RCStrFailedToMapFile = 'Failed to map file';
  RCStrFailedToCreateMapFile = 'Failed to create map file (%s)';
  RCStrFailedToMapViewOfFile = 'Failed to map view of file.';

function GetTempPath: TFileName;
begin
  Result := TPath.GetTempFileName;
end;

{$ENDIF}

{ TMemoryBackend }

procedure TMemoryBackend.InitializeSurface(NewWidth, NewHeight: Integer; ClearBuffer: Boolean);
begin
  GetMem(FBits, NewWidth * NewHeight * 4);
  if ClearBuffer then
    FillLongword(FBits[0], NewWidth * NewHeight, clBlack32);
end;

procedure TMemoryBackend.FinalizeSurface;
begin
  if Assigned(FBits) then
  begin
    FreeMem(FBits);
    FBits := nil;
  end;
end;


end.