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{*****
Copyright (c) 2012 Michał Gawrycki (michal.gawrycki(a.t.)gmsystems.pl
License: modified LGPL (see 'COPYING.modifiedLGPL.txt' in Lazarus directory)
*****}
unit LR_e_img;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LR_Class, Graphics, LazUtf8Classes;
type
TfrImageExport = class(TComponent)
end;
{ TfrImageExportFilter }
TfrImageExportFilter = class(TfrExportFilter)
private
FBmp: TFPImageBitmap;
FCurPage: Integer;
FFileName: String;
FFileExt: String;
FZoom: Extended;
FJQuality: TJPEGQualityRange;
FColor: TColor;
public
constructor Create(AStream: TStream); override;
destructor Destroy; override;
procedure OnBeginDoc; override;
procedure OnEndPage; override;
property Zoom: Extended read FZoom write FZoom;
property JPEGQuality: TJPEGQualityRange read FJQuality write FJQuality;
property BackgroundColor: TColor read FColor write FColor;
end;
implementation
{ TfrImageExportFilter }
constructor TfrImageExportFilter.Create(AStream: TStream);
begin
inherited Create(AStream);
FFileName := TFileStreamUtf8(AStream).FileName;
FFileExt := LowerCase(ExtractFileExt(FFileName));
FFileName := ChangeFileExt(FFileName, '');
FZoom := 1;
FCurPage := 0;
FJQuality := 75;
FColor := clWhite;
if FFileExt = '.jpg' then
FBmp := TJPEGImage.Create
else
if FFileExt = '.png' then
FBmp := TPortableNetworkGraphic.Create
else
FBmp := TBitmap.Create;
end;
destructor TfrImageExportFilter.Destroy;
begin
FBmp.Free;
inherited Destroy;
end;
procedure TfrImageExportFilter.OnBeginDoc;
begin
if FBmp is TJPEGImage then
TJPEGImage(FBmp).CompressionQuality := FJQuality;
end;
procedure TfrImageExportFilter.OnEndPage;
var
TmpVisible: Boolean;
begin
Inc(FCurPage);
FBmp.Clear;
FBmp.SetSize(Round(CurReport.EMFPages[FCurPage - 1]^.PrnInfo.Pgw * FZoom),
Round(CurReport.EMFPages[FCurPage - 1]^.PrnInfo.Pgh * FZoom));
FBmp.Canvas.Brush.Color := FColor;
FBmp.Canvas.Brush.Style := bsSolid;
FBmp.Canvas.FillRect(0, 0, FBmp.Width, FBmp.Height);
TmpVisible := CurReport.EMFPages[FCurPage - 1]^.Visible;
CurReport.EMFPages[FCurPage - 1]^.Visible := True;
CurReport.EMFPages.Draw(FCurPage - 1, FBmp.Canvas, Rect(0, 0, FBmp.Width, FBmp.Height));
CurReport.EMFPages[FCurPage - 1]^.Visible := TmpVisible;
if FCurPage = 1 then
FBmp.SaveToStream(Stream)
else
FBmp.SaveToFile(FFileName + '_' + IntToStr(FCurPage) + FFileExt);
end;
initialization
frRegisterExportFilter(TfrImageExportFilter, 'Bitmap file (*.bmp)', '*.bmp');
frRegisterExportFilter(TfrImageExportFilter, 'JPEG file (*.jpg)', '*.jpg');
frRegisterExportFilter(TfrImageExportFilter, 'PNG file (*.png)', '*.png');
end.
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