Examples of java.awt.image.BandCombineOp.filter()

java.awt.image.BandCombineOp.filter()
Transforms the Raster using the matrix specified in the constructor. An IllegalArgumentException may be thrown if the number of bands in the source or destination is incompatible with the matrix. See the class comments for more details.
If the destination is null, it will be created with a number of bands equalling the number of rows in the matrix. No exception is thrown if the operation causes a data overflow. @param src The Raster to be filtered. @param dst The Raster in which to store the results of the filter operation. @return The filtered Raster. @throws IllegalArgumentException If the number of bands in the source or destination is incompatible with the matrix.

                matrix[0][0] = 1;
            }


            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
        } else {
            Raster         srcRas = src.getData(wr.getBounds());
            WritableRaster srcWr  = (WritableRaster)srcRas;


            // Divide out alpha if we have it.  We need to do this since

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                dstBI = new BufferedImage(cmna, dstWr, false, null);
            }


            ColorConvertOp op = new ColorConvertOp(null);
            op.filter(srcBI, dstBI);


            // I never have to 'fix' alpha premult since I take
            // it's value from my source....
            if (dstCM.hasAlpha())
                copyBand(srcWr, sm.getNumBands()-1,

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                matrix[3][3] = 1; // Alpha
                break;
            }
            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
            return wr;
        }


        if (srcCM.getColorSpace() ==
            ColorSpace.getInstance(ColorSpace.CS_GRAY)) {

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                matrix[4][1] = 1; // Alpha
                break;
            }
            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
            } catch (Throwable t) {
                t.printStackTrace();
            }
            return wr;
        }

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        // System.out.println("src: " + srcBI.getWidth() + "x" +
        //                    srcBI.getHeight());


        ColorConvertOp op = new ColorConvertOp(dstCM.getColorSpace(),
                                               null);
        dstBI = op.filter(srcBI, null);


        // System.out.println("After filter:");


        WritableRaster wr00 = wr.createWritableTranslatedChild(0,0);
        for (int i=0; i<dstCM.getColorSpace().getNumComponents(); i++)

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                break;
            }


            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
        } else {
            ColorModel dstCM = getColorModel();
            BufferedImage dstBI;


            if (!dstCM.hasAlpha()) {

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             * System.out.println("dst: " + dstBI.getWidth() + "x" +
             *                    dstBI.getHeight());
             */


            ColorConvertOp op = new ColorConvertOp(null);
            op.filter(srcBI, dstBI);


            if (dstCM.hasAlpha())
                copyBand(srcWr, srcSM.getNumBands()-1,
                         wr,    getSampleModel().getNumBands()-1);
        }

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    // Basic checks on output
    BandCombineOp op = new BandCombineOp(matrix, null);
    WritableRaster dst2 = op.createCompatibleDestRaster(src);
    WritableRaster dst = op.filter(src, dst2);
    harness.check(dst, dst2);
    harness.check(dst.getNumBands(), 2);
    
    // A null dst2 should also work
    dst2 = null;

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    harness.check(dst, dst2);
    harness.check(dst.getNumBands(), 2);
    
    // A null dst2 should also work
    dst2 = null;
    dst = op.filter(src, dst2);
    harness.check(dst instanceof WritableRaster);
    harness.check(dst2, null);
    
    // Check first band
    int[] pixels = dst.getSamples(0, 0, 5, 5, 0, (int[])null);

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    // there is one more column in the matrix than there are bands
    // And throw in a check with negative numbers too... why not =)
    matrix = new float[][] {{2, -7, 5},
                            {5, 6, -3}};
    op = new BandCombineOp(matrix, null);
    dst = op.filter(src, dst);
    
    // First band
    pixels = dst.getSamples(0, 0, 5, 5, 0, (int[])null);
    Arrays.fill(expected, 5);
    expected[7] = 130;

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