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I'll need to write a small help-file eventually.
In the meantime this'll have to do.... :)

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Installation: read INSTALL.txt

Distribution: read REDIST.txt and LIBMNG_DLL.txt

License info: read LICENSE.txt and check NGImages.pas header comments

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Compiler options:

You can toggle the $DEFINE's at the top of NGDefs.inc to enable/disable one or
more of the optional components in the package.

Windows: libmng.dll contains everything to display PNG, JNG, MNG and JPEG files,
as well as handle any zlib functionality.

Linux: libmng.so contains everything to display PNG, JNG & MNG files.
(JPEG and zlib functionality are supplied by their respective libraries)

Turning the options (which is the default) on will hardly increase the size of
your executable! But if you prefer to use other libraries (eg. PNG or JPEG),
you can disable their support here.

Windows: if you are already using the 'standard' TJPEGImage it's a snap to
switch to the implementation in NGImage.pas *and* it will save you about 75KB
on the size of your executable!!!

Note: the PNG decoder in libmng has been reported to be fairly faster than
most other (native) Delphi-based PNG decoders.

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Displaying PNG, JNG, MNG:

// Image1 : TImage;                       // defined on form

procedure Form1.Display;
var NG : TNGImage;
begin
  NG := TNGImage.Create;
  try
    NG.LoadFromFile('somefile.mng');      // select one...
//    NG.LoadFromFile('somefile.png');
//    NG.LoadFromFile('somefile.jng');
    Image1.Picture.Assign(NG);
  finally
    NG.Free;
  end;
end;

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Displaying MNG with status-control:

// Image1 : TImage;                       // defined on form
// BtnPause : TButton;
// BtnPlay : TButton;
// procedure StatusChange(sender: TOBject);

procedure Form1.Display;
var NG : TNGImage;
begin
  NG := TNGImage.Create;
  try
    NG.LoadFromFile('somefile.mng');
    Image1.Picture.Assign(NG);
    TNGImage(Image1.Picture.Graphic).OnStatusChange := StatusChange;
    StatusChange(nil);
  finally
    NG.Free;
  end;
end;

procedure Form1.StatusChange;
begin
  BtnPause.Enabled := TNGImage(Image1.Picture.Graphic).StatusRunning;
  BtnPlay.Enabled := not BtnPause.Enabled;
end;

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Displaying JPEG:

Just use TJPEGImage like you would otherwise

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Writing PNG:

procedure BMP2PNG(Bitmap: TBitmap; Filename: string);
var NG : TNGImage;
begin
  NG := TNGImage.Create;
  try
    NG.Assign (Bitmap);
    NG.SaveToPNGfile (Filename);
  finally
    NG.Free;
  end;
end;

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Writing JNG:

procedure BMP2JNG(Bitmap: TBitmap; Filename: string);
var NG : TNGImage;
begin
  NG := TNGImage.Create;
  try
    NG.Assign(Bitmap);
    NG.SaveToJNGfile(Filename);
  finally
    NG.Free;
  end;
end;

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Writing PNG with alpha:

procedure BMP2PNGA (Bitmap: TBitmap; Color: TColor; Filename: string);
var NG : TNGImage;
begin
  NG := TNGImage.Create;
  try
    NG.Assign(Bitmap);
    NG.SetAlphaColor(Color);           // set single transparent color
//    NG.SetAlphaBitmap(SomeBitmap);     // set complete alpha-channel
    NG.SaveToPNGfile(Filename);
  finally
    NG.Free;
  end;
end;

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Writing JNG with alpha:

procedure BMP2JNGA (Bitmap: TBitmap; Color: TColor; Filename: string);
var NG : TNGImage;
begin
  NG := TNGImage.Create;
  try
    NG.Assign(Bitmap);
    NG.SetAlphaColor(Color);           // set single transparent color
//    NG.SetAlphaBitmap(SomeBitmap);     // set complete alpha-channel
    NG.SaveToJNGfile(Filename);
  finally
    NG.Free;
  end;
end;

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