PNG to PCL in Delphi 2005

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hdesai24
Posts: 2
Joined: 2012-01-19T14:57:42-07:00
Authentication code: 8675308

PNG to PCL in Delphi 2005

Post by hdesai24 » 2012-01-19T15:06:49-07:00

I am trying to convert PNG to PCL using ImageMagick and it works wonderfully.

There are constraints to copying all ImageMagick dll files, what i am looking out for is just one single dll which exports the "convert" method without having to register itself. This dll should require bare minimum dependent files. Can't go with COM+ objects, is there any non ActiveX dll which i can use in my Delphi 2005 application.

Just want to call loadlibrary and call the method to convert. Any help is appreciated.

hdesai24
Posts: 2
Joined: 2012-01-19T14:57:42-07:00
Authentication code: 8675308

Re: PNG to PCL in Delphi 2005

Post by hdesai24 » 2012-01-25T09:44:40-07:00

Found the solution,

I didn't use ImageMagick since i couldn't go for COM objects, instead this is a all delphi solution.

I had a True Colour PNG Barcode Image which had to be converted to PCL, did the conversion using TPngImage (http://stackoverflow.com/questions/8898 ... equivalent) and GIFImage.pas (http://www.tolderlund.eu/delphi/)

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, pngimage, GIFImage;

var
PNGImg: TPNGObject;
BMPImg, BWImg: TBitmap;
Output: System.Text;

Begin
PNGImg := TPNGObject.Create;
BMPImg := TBitmap.Create;

PNGImg.LoadFromFile('Image.png');
PNGImg.AssignTo(BMPImg);
// Call GifImage Reduce Colours to reduce from RGB to MonoChrome (Black and white)
BWImg := ReduceColors(BMPImg, rmMonochrome, dmNearest, 1, 0);
// Reduce to 1 bit Depth
BWImg.PixelFormat := pf1bit;

AssignFile(output, Output.pcl');
Rewrite(output);
EncodeGraphicAsPCL(BWImg, pclstr);
Write(output, pclstr);
CloseFile(output);
end;

// This one is straight out of http://www.delphigroups.info/2/11/322198.html

Procedure EncodeGraphicAsPCL(aGraphic: TBitmap; var AOutString: string);
const
cGraphicsBegin = #27+'*r0F' + #27+'*t0300R' + #27+'*r1A';
cGraphicsChunk = #27+'*b%dW%s'; // the number of bytes in the chunk must replace "%d"
cGraphicsEnd = #27+'*rB';
var
vNdx: integer;
vtmpLine: string;
vRow: pByteArray;
vBytesInGraphicRow: integer;
i: integer;
x: byte;
begin
AOutString := '';
// Div by 8
vBytesInGraphicRow := (aGraphic.Width div Eight );
// Mod by 8
if (aGraphic.Width mod Eight)>0 then
inc(vBytesInGraphicRow);
for vNdx := 0 to aGraphic.Height - 1 do
begin
vRow := pByteArray(aGraphic.ScanLine[vNdx]);
vtmpLine := '';
for i := 1 to vBytesInGraphicRow do
begin
x := vRow[i-1];
x := NOT x;
vtmpLine := vtmpLine + char(x);
end;
AOutString := AOutString + format(cGraphicsChunk, [vBytesInGraphicRow,
vtmpLine]);
end;
if length(AOutString)>0 then
begin
AOutString := cGraphicsBegin + AOutString + cGraphicsEnd;
end;
end;

End;

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