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{
This demo shows how you can manipulate the data of a TfpgImage
directly.
}
program bitmaptest;
{$mode objfpc}{$H+}
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_imgfmt_bmp,
gui_form;
type
TMainForm = class(TfpgForm)
private
img: TfpgImage;
protected
procedure HandlePaint; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
end;
{ TMainForm }
procedure TMainForm.HandlePaint;
var
i, j: integer;
begin
Canvas.BeginDraw; // activate double buffering in time.
// inherited HandlePaint;
img.Free;
img := TfpgImage.Create;
img.AllocateImage(32, 256, 256);
img.UpdateImage;
// populate the bitmap with pretty colors :-)
for j := 0 to 255 do
for i := 0 to 255 do
PLongWord(img.ImageData)[j * 256 + i] := (i shl 16) or (j shl 8);
Canvas.DrawImage(0, 0, img);
Canvas.EndDraw;
end;
constructor TMainForm.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
SetPosition(100, 100, 256, 256);
WindowTitle := 'fpGUI Bitmap Test';
end;
destructor TMainForm.Destroy;
begin
img.Free;
inherited Destroy;
end;
procedure MainProc;
var
frm: TMainForm;
begin
fpgApplication.Initialize;
frm := TMainForm.Create(nil);
frm.Show;
fpgApplication.Run;
end;
begin
MainProc;
end.
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