Example usage for java.awt.image ComponentColorModel hasAlpha

Introduction

In this page you can find the example usage for java.awt.image ComponentColorModel hasAlpha.

Prototype

public final boolean hasAlpha() 

Source Link

Document

Returns whether or not alpha is supported in this ColorModel .

Usage

From source file:org.geotools.utils.imagemosaic.MosaicIndexBuilder.java

/**
 * This method checks the {@link ColorModel} of the current image with the
 * one of the first image in order to check if they are compatible or not in
 * order to perform a mosaic operation./*from  w  ww  . j av a  2  s  . com*/
 * 
 * <p>
 * It is worth to point out that we also check if, in case we have two index
 * color model image, we also try to suggest whether or not we should do a
 * color expansion.
 * 
 * @param defaultCM
 * @param defaultPalette
 * @param actualCM
 * @return a boolean asking to skip this feature.
 */
private boolean checkColorModels(ColorModel defaultCM, byte[][] defaultPalette, ColorModel actualCM) {

    // /////////////////////////////////////////////////////////////////////
    //
    //
    // ComponentColorModel
    //
    //
    // /////////////////////////////////////////////////////////////////////
    if (defaultCM instanceof ComponentColorModel && actualCM instanceof ComponentColorModel) {
        final ComponentColorModel defCCM = (ComponentColorModel) defaultCM,
                actualCCM = (ComponentColorModel) actualCM;
        return !(defCCM.getNumColorComponents() == actualCCM.getNumColorComponents()
                && defCCM.hasAlpha() == actualCCM.hasAlpha()
                && defCCM.getColorSpace().equals(actualCCM.getColorSpace())
                && defCCM.getTransparency() == actualCCM.getTransparency()
                && defCCM.getTransferType() == actualCCM.getTransferType());
    }
    // /////////////////////////////////////////////////////////////////////
    //
    //
    // IndexColorModel
    //
    //
    // /////////////////////////////////////////////////////////////////////
    if (defaultCM instanceof IndexColorModel && actualCM instanceof IndexColorModel) {
        final IndexColorModel defICM = (IndexColorModel) defaultCM, actualICM = (IndexColorModel) actualCM;
        if (defICM.getNumColorComponents() != actualICM.getNumColorComponents()
                || defICM.hasAlpha() != actualICM.hasAlpha()
                || !defICM.getColorSpace().equals(actualICM.getColorSpace())
                || defICM.getTransferType() != actualICM.getTransferType())
            return true;
        // ///
        //
        // Suggesting expansion in the simplest case
        //
        // ///
        if (defICM.getMapSize() != actualICM.getMapSize()
                || defICM.getTransparency() != actualICM.getTransparency()
                || defICM.getTransferType() != actualICM.getTransferType()
                || defICM.getTransparentPixel() != actualICM.getTransparentPixel()) {
            mustConvertToRGB = true;
            return false;
        }
        // //
        //
        // Now checking palettes to see if we need to do a color convert
        //
        // //
        // get the palette for this color model
        int numBands = actualICM.getNumColorComponents();
        byte[][] actualPalette = new byte[3][actualICM.getMapSize()];
        actualICM.getReds(actualPalette[0]);
        actualICM.getGreens(actualPalette[0]);
        actualICM.getBlues(actualPalette[0]);
        if (numBands == 4)
            actualICM.getAlphas(defaultPalette[0]);
        // compare them
        for (int i = 0; i < defICM.getMapSize(); i++)
            for (int j = 0; j < numBands; j++)
                if (actualPalette[j][i] != defaultPalette[j][i]) {
                    mustConvertToRGB = true;
                    break;
                }
        return false;

    }
    // //
    //
    // if we get here this means that the two color models where completely
    // different, hence skip this feature.
    //
    // //
    return true;
}

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