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{
fpGUI - Free Pascal GUI Library
Example: Display BMP file with monochrome mask
Copyright (C) 2000 - 2007 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
}
program MaskTest;
{$ifdef fpc}
{$mode objfpc}{$H+}
{$endif}
uses
Classes, GFXBase, fpGFX, fpImg, BMPReader;
type
TMainWindow = class(TFWindow)
private
Image2, Image4, Image8, Image24, Mask: TFBitmap;
Image2Canvas, Image4Canvas, Image8Canvas,
Image24Canvas, MaskCanvas: TFCanvas;
protected
procedure Paint(Sender: TObject; const ARect: TRect);
public
constructor Create; overload;
destructor Destroy; override;
end;
constructor TMainWindow.Create;
begin
inherited Create(nil, [woWindow]);
// Load and prepare the images
Image2 := CreateImageFromFile(GFScreen, TBMPReader, 'image2.bmp');
Image2Canvas := TFCanvas(GFScreen.CreateBitmapCanvas(Image2.Width, Image2.Height));
Image2Canvas.DrawImage(Image2, Point(0, 0));
Image4 := CreateImageFromFile(GFScreen, TBMPReader, 'image4.bmp');
Image4Canvas := TFCanvas(GFScreen.CreateBitmapCanvas(Image4.Width, Image4.Height));
Image4Canvas.DrawImage(Image4, Point(0, 0));
Image8 := CreateImageFromFile(GFScreen, TBMPReader, 'image8.bmp');
Image8Canvas := TFCanvas(GFScreen.CreateBitmapCanvas(Image8.Width, Image8.Height));
Image8Canvas.DrawImage(Image8, Point(0, 0));
Image24 := CreateImageFromFile(GFScreen, TBMPReader, 'image24.bmp');
Image24Canvas := TFCanvas(GFScreen.CreateBitmapCanvas(Image24.Width, Image24.Height));
Image24Canvas.DrawImage(Image24, Point(0, 0));
// Load and prepare the image mask
Mask := CreateImageFromFile(GFScreen, TBMPReader, 'mask.bmp');
MaskCanvas := TFCanvas(GFScreen.CreateMonoBitmapCanvas(Mask.Width, Mask.Height));
// MaskCanvas := Display.DefaultScreen.CreateMonoBitmap(Mask.Width, Mask.Height);
MaskCanvas.DrawImage(Mask, Point(0, 0));
Title := 'fpImg Blitting Mask Test';
OnPaint := @Paint;
SetClientSize(Size(Image2.Width * 2 + 64, Image2.Height * 2 + 64));
end;
destructor TMainWindow.Destroy;
begin
MaskCanvas.Free;
Mask.Free;
Image24Canvas.Free;
Image24.Free;
Image8Canvas.Free;
Image8.Free;
Image4Canvas.Free;
Image4.Free;
Image2Canvas.Free;
Image2.Free;
inherited Destroy;
end;
procedure TMainWindow.Paint(Sender: TObject; const ARect: TRect);
var
Color: TGfxColor;
r: TRect;
i, x1, y1, x2, y2: Integer;
begin
Color.Red := 0;
Color.Green := 0;
Color.Alpha := 0;
r.Left := ARect.Left;
r.Right := ARect.Right;
for i := ARect.Top to ARect.Bottom - 1 do
begin
Color.Blue := $ffff - (i * $ffff) div Height;
Color.Red := Color.Blue shr 1;
Canvas.SetColor(Color);
r.Top := i;
r.Bottom := i + 1;
Canvas.FillRect(r);
end;
x1 := ClientWidth div 4 - Image2.Width div 2;
y1 := ClientHeight div 4 - Image2.Height div 2;
x2 := x1 + ClientWidth div 2;
y2 := y1 + ClientHeight div 2;
Canvas.SetColor(colWhite);
Canvas.MaskedCopy(Image2Canvas, MaskCanvas, Point(x1, y1));
Canvas.TextOut(Point(x1, y1 + Image2.Height), 'monochrome');
Canvas.MaskedCopy(Image4Canvas, MaskCanvas, Point(x2, y1));
Canvas.TextOut(Point(x2, y1 + Image2.Height), '4bpp palettized');
Canvas.MaskedCopy(Image8Canvas, MaskCanvas, Point(x1, y2));
Canvas.TextOut(Point(x1, y2 + Image2.Height), '8bpp palettized');
Canvas.MaskedCopy(Image24Canvas, MaskCanvas, Point(x2, y2));
Canvas.TextOut(Point(x2, y2 + Image2.Height), '24bpp true color');
end;
var
MainWindow: TMainWindow;
begin
GFApplication.Initialize;
MainWindow := TMainWindow.Create;
MainWindow.Show;
GFApplication.Run;
end.
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