purePDF and transparent BitmapData

http://www.fcoss.nl/?research-design-essay Research Design Essay Recently I’ve updated purePDF to a new version fixing one bug which caused problems with PNG images. However when you’re trying to add BitmapData with transparency  to a pdf document you probably get black backgrounds to your images. This is because internaly purePDF converts bitmapdata into 24bit tiff images, so no alpha informations.

This is a script you can use to convert your BitmapData images into transparent pdf ImageElements:

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/**
 * Create a transparent ImageElement
 *
 * An ImageElement with the input bitmapdata RGB informations will be
 * created and an ImageElement will be used as mask ( using the alpha info from the bitmapdata )
 * If the input bitmapdata is not transparent a regular ImageElement will be returned.
 */

protected function createTransparentImageElement( bitmap: BitmapData ): ImageElement
{
        var output: ByteArray = new ByteArray();
        var transparency: ByteArray = new ByteArray();
        var input: ByteArray = bitmap.getPixels( bitmap.rect );
        input.position = 0;
       
        while( input.bytesAvailable ){
                const pixel: uint = input.readInt();
               
                // write the RGB informations
                output.writeByte( (pixel >> 16) & 0xff );
                output.writeByte( (pixel >> 8) & 0xff );
                output.writeByte( (pixel >> 0) & 0xff );
               
                // write the alpha informations
                transparency.writeByte( (pixel >> 24) & 0xff );
        }
       
        output.position = 0;
        transparency.position = 0;
       
        var mask: ImageElement = ImageElement.getRawInstance( bitmap.width, bitmap.height, 1, 8, transparency, null );
        var image: ImageElement = ImageElement.getRawInstance( bitmap.width, bitmap.height, 3, 8, output, null );

        if( bitmap.transparent )
        {
                mask.makeMask();
                image.imageMask = mask;
        }
        return image;
}

and here there’s a demo app: http://bit.ly/dOT2ob

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