Examples of javax.media.jai.Warp

javax.media.jai.Warp
A description of an image warp.
The central method of a Warp is warpSparseRect(), which returns the source pixel positions for a specified (subdivided) rectangular region of the output.
As in the Interpolation class, pixel positions are represented using scaled integer coordinates, yielding subpixel accuracy but still allowing the use of integer arithmetic. The degree of precision is set by means of the getSubSampleBitsH() and getSubSampleBitsV parameters to the warpRect() method. @see Interpolation @see WarpAffine @see WarpGrid @see WarpPerspective @see WarpPolynomial @see WarpQuadratic @see WarpCubic @see WarpGeneralPolynomial @see WarpOpImage

        }


        /* Get BorderExtender from hints if any. */
        BorderExtender extender = RIFUtil.getBorderExtenderHint(hints);


        Warp warp = (Warp)args.getObjectParameter(0);
        Interpolation interp = (Interpolation)args.getObjectParameter(1);
        double[] backgroundValues = (double[])args.getObjectParameter(2);


        int filter = -1;
        if (interp instanceof InterpolationNearest)  {

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        // Get BorderExtender from renderHints if any.
        BorderExtender extender = RIFUtil.getBorderExtenderHint(renderHints);


        RenderedImage source = paramBlock.getRenderedSource(0);
        Warp warp = (Warp)paramBlock.getObjectParameter(0);
        Interpolation interp = (Interpolation)paramBlock.getObjectParameter(1);


        double[] backgroundValues = (double[])paramBlock.getObjectParameter(2);


        if (interp instanceof InterpolationNearest) {

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            Interpolation interpNN = interp instanceof InterpolationNearest ?
                interp :
                Interpolation.getInstance(Interpolation.INTERP_NEAREST);


            // Retrieve the Warp object.
            Warp warp = (Warp)pb.getObjectParameter(0);


            // Create the warped ROI.
            ROI dstROI = new ROI(JAI.create("warp", srcROI.getAsImage(),
                                            warp, interpNN));

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/* 60 */     ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);
/*    */ 
/* 64 */     BorderExtender extender = RIFUtil.getBorderExtenderHint(renderHints);
/*    */ 
/* 66 */     RenderedImage source = paramBlock.getRenderedSource(0);
/* 67 */     Warp warp = (Warp)paramBlock.getObjectParameter(0);
/* 68 */     Interpolation interp = (Interpolation)paramBlock.getObjectParameter(1);
/*    */ 
/* 70 */     double[] backgroundValues = (double[])paramBlock.getObjectParameter(2);
/*    */ 
/* 72 */     if ((interp instanceof InterpolationNearest)) {

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/* 110 */         srcROI = srcROI.intersect(new ROIShape(srcBounds));
/*     */       }
/*     */ 
/* 114 */       Interpolation interpNN = (interp instanceof InterpolationNearest) ? interp : Interpolation.getInstance(0);
/*     */ 
/* 119 */       Warp warp = (Warp)pb.getObjectParameter(0);
/*     */ 
/* 122 */       ROI dstROI = new ROI(JAI.create("warp", srcROI.getAsImage(), warp, interpNN));
/*     */ 
/* 126 */       Rectangle dstBounds = op.getBounds();
/*     */

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        final WarpTransform2D inverse = (WarpTransform2D) transform.inverse();
        assertNotNull("WKT formatting test", transform.toString());
        /*
         * Checks Warp properties.
         */
        final Warp warp = transform.getWarp();
        assertTrue("Expected a polynomial warp but got " + Classes.getShortClassName(warp),
                   warp instanceof WarpPolynomial);
        final WarpPolynomial poly = (WarpPolynomial) warp;
        /*
         * Compares transformations to the expected points.

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            if(!srcBounds.contains(srcROI.getBounds())) {
                srcROI = srcROI.intersect(new ROIShape(srcBounds));
            }


            // Retrieve the Warp object.
            Warp warp = (Warp)pb.getObjectParameter(0);


            // Setting constant image to be warped as a ROI
            Rectangle dstBounds = op.getBounds();
            
            // Setting layout of the constant image

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            final float[] yCoeffs   = (float[]) value(Y_COEFFS, values);
            final float   preScaleX = scale( PRE_SCALE_X, values);
            final float   preScaleY = scale( PRE_SCALE_Y, values);
            final float  postScaleX = scale(POST_SCALE_X, values);
            final float  postScaleY = scale(POST_SCALE_Y, values);
            final Warp warp;
            switch (degree) {
                case 1:  warp = new WarpAffine           (xCoeffs, yCoeffs, preScaleX, preScaleY, postScaleX, postScaleY); break;
                case 2:  warp = new WarpQuadratic        (xCoeffs, yCoeffs, preScaleX, preScaleY, postScaleX, postScaleY); break;
                case 3:  warp = new WarpCubic            (xCoeffs, yCoeffs, preScaleX, preScaleY, postScaleX, postScaleY); break;
                default: warp = new WarpGeneralPolynomial(xCoeffs, yCoeffs, preScaleX, preScaleY, postScaleX, postScaleY); break;

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         * delegates the work to a "Crop" operation.
         */
        final String operation;
        final ParameterBlock paramBlk = new ParameterBlock().addSource(sourceImage);
        final Map<String, Object> imageProperties = new HashMap<String, Object>();
        Warp warp = null;
        if (allSteps.isIdentity() || (allSteps instanceof AffineTransform &&
                XAffineTransform.isIdentity((AffineTransform) allSteps, EPS)))
        {
            /*
             * Since there is no interpolation to perform, use the native view (which may be

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             * matches exactly the source rectangle. Checks if the bounding boxes calculated by the
             * Warp object match the expected ones. In the usual case where they do, we are done.
             * Otherwise we assume that the difference is caused by rounding error and we will try
             * progressive empirical adjustment in order to get the rectangles to fit.
             */
            final Warp warp = wb.buildWarp(transform, targetBB);
            if(true) {
                return warp;
            }
            
//            // remainder is disabled for now since it break Geoserver build.

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