Example usage for java.awt CompositeContext CompositeContext

Introduction

In this page you can find the example usage for java.awt CompositeContext CompositeContext.

Prototype

CompositeContext

Source Link

Usage

From source file:main.MapKit.java

@Override
public CompositeContext createContext(ColorModel srcColorModel, ColorModel dstColorModel,
        RenderingHints hints) {/*w ww.j a v  a 2 s .c o m*/
    return new CompositeContext() {
        @Override
        public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {
            if (src.getSampleModel().getDataType() != DataBuffer.TYPE_INT
                    || dstIn.getSampleModel().getDataType() != DataBuffer.TYPE_INT
                    || dstOut.getSampleModel().getDataType() != DataBuffer.TYPE_INT) {
                throw new IllegalStateException("Source and destination must store pixels as INT.");
            }

            int width = Math.min(src.getWidth(), dstIn.getWidth());
            int height = Math.min(src.getHeight(), dstIn.getHeight());

            int[] srcPixel = new int[4];
            int[] dstPixel = new int[4];
            int[] srcPixels = new int[width];
            int[] dstPixels = new int[width];

            for (int y = 0; y < height; y++) {
                src.getDataElements(0, y, width, 1, srcPixels);
                dstIn.getDataElements(0, y, width, 1, dstPixels);

                for (int x = 0; x < width; x++) {
                    // pixels are stored as INT_ARGB
                    // our arrays are [R, G, B, A]
                    int pixel = srcPixels[x];
                    srcPixel[0] = (pixel >> 16) & 0xFF;
                    srcPixel[1] = (pixel >> 8) & 0xFF;
                    srcPixel[2] = (pixel >> 0) & 0xFF;
                    srcPixel[3] = (pixel >> 24) & 0xFF;

                    pixel = dstPixels[x];
                    dstPixel[0] = (pixel >> 16) & 0xFF;
                    dstPixel[1] = (pixel >> 8) & 0xFF;
                    dstPixel[2] = (pixel >> 0) & 0xFF;
                    dstPixel[3] = (pixel >> 24) & 0xFF;

                    int[] result = new int[] { (srcPixel[0] * dstPixel[0]) >> 8,
                            (srcPixel[1] * dstPixel[1]) >> 8, (srcPixel[2] * dstPixel[2]) >> 8,
                            (srcPixel[3] * dstPixel[3]) >> 8 };

                    // mixes the result with the opacity
                    dstPixels[x] = (result[3]) << 24 | (result[0]) << 16 | (result[1]) << 8 | (result[2]);
                }
                dstOut.setDataElements(0, y, width, 1, dstPixels);
            }
        }

        @Override
        public void dispose() {
            // empty
        }
    };
}

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