Examples of java.awt.image.renderable.RenderContext

java.awt.image.renderable.RenderContext
A RenderContext encapsulates the information needed to produce a specific rendering from a RenderableImage. It contains the area to be rendered specified in rendering-independent terms, the resolution at which the rendering is to be performed, and hints used to control the rendering process.
Users create RenderContexts and pass them to the RenderableImage via the createRendering method. Most of the methods of RenderContexts are not meant to be used directly by applications, but by the RenderableImage and operator classes to which it is passed.
The AffineTransform parameter passed into and out of this class are cloned. The RenderingHints and Shape parameters are not necessarily cloneable and are therefore only reference copied. Altering RenderingHints or Shape instances that are in use by instances of RenderContext may have undesired side effects.

        
        background = new PadRable8Bit(background, r2d, PadMode.ZERO_PAD);


        
        RenderedImage ri = background.createRendering
            (new RenderContext(renderContext.getTransform(), r2d, 
                               renderContext.getRenderingHints()));
        // System.out.println("RI: [" + ri.getMinX() + ", " 
        //                    + ri.getMinY() + ", " +
        //                    + ri.getWidth() + ", " +
        //                    + ri.getHeight() + "]");

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        // Get our sources image...
        // System.out.println("UnOpt: " + filter);
        AffineTransform at = g2d.getTransform();
        RenderedImage ri = filter.createRendering
            (new RenderContext(at, g2d.getClip(), g2d.getRenderingHints()));


        if (ri == null)
            return;


        g2d.setTransform(IDENTITY);

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        RenderedImage ri = null;
        if (arect.intersects(srect) == true) {
            srect = (Rectangle2D)srect.clone();
            Rectangle2D.intersect(srect, arect, srect);
            
            RenderContext srcRC = new RenderContext(usr2dev, srect, rh);
            ri = src.createRendering(srcRC);


            // System.out.println("Pad filt: " + src + " R: " +
            //                    src.getBounds2D());
        }

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        rh.put(RenderingHintsKeyExt.KEY_COLORSPACE, 
               ColorSpaceHintKey.VALUE_COLORSPACE_ALPHA_CONVERT);


        RenderedImage ri;
        ri = getSource().createRendering(new RenderContext(at, aoi, rh));
        if (ri == null)
            return null;


        CachableRed cr = RenderedImageCachableRed.wrap(ri);

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        at = usr2dev;
        rcAT = new AffineTransform(at.getScaleX(), at.getShearY(),
                                   at.getShearX(), at.getScaleY(),
                                   0, 0);


        RenderContext rc = new RenderContext(rcAT, null, renderingHints);
            
        RenderedImage ri = rootFilter.createRendering(rc);
        if (ri == null)
            return null;

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        at = usr2dev;
        rcAT = new AffineTransform(at.getScaleX(), at.getShearY(),
                                   at.getShearX(), at.getScaleY(),
                                   0, 0);


        RenderContext rc = new RenderContext(rcAT, null, renderingHints);
            
        RenderedImage ri = rootFilter.createRendering(rc);
        if (ri == null)
            return null;

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            AffineTransform invAt = AffineTransform.getScaleInstance
                (1/sx, 1/sy);
            aoi = invAt.createTransformedShape(aoi);
        }


        return f.createRendering(new RenderContext(at, aoi, rh));
    }

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        // We only want it's alpha channel...
        rh.put(RenderingHintsKeyExt.KEY_COLORSPACE, 
               ColorSpaceHintKey.VALUE_COLORSPACE_ALPHA);


        RenderedImage ri;
        ri = getSource().createRendering(new RenderContext(at, aoi, rh));
        
        if(ri == null){
            return null;
        }

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        AffineTransform resAt = new AffineTransform(sx/scaleX, shy/scaleX,
                                                    shx/scaleY, sy/scaleY,
                                                    tx, ty);


        RenderedImage ri;
        ri = getSource().createRendering(new RenderContext(srcAt, r, rh));
        if (ri == null)
            return null;


        // org.apache.batik.test.gvt.ImageDisplay.printImage
        //     ("Padded Image", ri,

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        g2d.setPaint(Color.white);
        g2d.fill(devShape);
        g2d.dispose();


        RenderedImage ri;
        ri = getSource().createRendering(new RenderContext(usr2dev, rect, rh));


        CachableRed cr, clipCr;
        cr = RenderedImageCachableRed.wrap(ri);
        clipCr = new BufferedImageCachableRed(bi, devR.x, devR.y);
        CachableRed ret = new MultiplyAlphaRed(cr, clipCr);

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