componentcolormodel.java

JAVA基本类源代码,大家可以学习学习!

                         "compatible with transferType " + transferType);
        }
        setupLUTs();
    }

    /**
     * Constructs a <CODE>ComponentColorModel</CODE> from the specified 
     * parameters. Color components will be in the specified 
     * <CODE>ColorSpace</CODE>.  The supported transfer types are
     * <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
     * <CODE>DataBuffer.TYPE_INT</CODE>,
     * <CODE>DataBuffer.TYPE_SHORT</CODE>, <CODE>DataBuffer.TYPE_FLOAT</CODE>,
     * and <CODE>DataBuffer.TYPE_DOUBLE</CODE>.  The number of significant
     * bits per color and alpha component will be 8, 16, 32, 16, 32,  or 64,
     * respectively.  The number of color components will be the
     * number of components in the <CODE>ColorSpace</CODE>.  There will be
     * an alpha component if <CODE>hasAlpha</CODE> is <CODE>true</CODE>.
     * If <CODE>hasAlpha</CODE> is true, then 
     * the boolean <CODE>isAlphaPremultiplied</CODE> 
     * specifies how to interpret color and alpha samples in pixel values.  
     * If the boolean is true, color samples are assumed to have been 
     * multiplied by the alpha sample. The <CODE>transparency</CODE> 
     * specifies what alpha values can be represented by this color model.
     * The acceptable <code>transparency</code> values are
     * <CODE>OPAQUE</CODE>, <CODE>BITMASK</CODE> or <CODE>TRANSLUCENT</CODE>.
     * The <CODE>transferType</CODE> is the type of primitive array used
     * to represent pixel values.
     *
     * @param colorSpace       The <CODE>ColorSpace</CODE> associated 
     *                         with this color model.
     * @param hasAlpha         If true, this color model supports alpha.
     * @param isAlphaPremultiplied If true, alpha is premultiplied.
     * @param transparency     Specifies what alpha values can be represented
     *                         by this color model.
     * @param transferType     Specifies the type of primitive array used to
     *                         represent pixel values.
     *
     * @throws IllegalArgumentException If transferType is not one of
     *         <CODE>DataBuffer.TYPE_BYTE</CODE>,
     *         <CODE>DataBuffer.TYPE_USHORT</CODE>,
     *         <CODE>DataBuffer.TYPE_INT</CODE>,
     *         <CODE>DataBuffer.TYPE_SHORT</CODE>,
     *         <CODE>DataBuffer.TYPE_FLOAT</CODE>, or
     *         <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
     *
     * @see ColorSpace
     * @see java.awt.Transparency
     * @since 1.4
     */
    public ComponentColorModel (ColorSpace colorSpace,
                                boolean hasAlpha,
                                boolean isAlphaPremultiplied,
                                int transparency,
                                int transferType) {
        this(colorSpace, null, hasAlpha, isAlphaPremultiplied,
             transparency, transferType);
    }

    private static int bitsHelper(int transferType,
                                  ColorSpace colorSpace,
                                  boolean hasAlpha) {
        int numBits = DataBuffer.getDataTypeSize(transferType);
        int numComponents = colorSpace.getNumComponents();
        if (hasAlpha) {
            ++numComponents;
        }
        return numBits * numComponents;
    }

    private static int[] bitsArrayHelper(int[] origBits,
                                         int transferType,
                                         ColorSpace colorSpace,
                                         boolean hasAlpha) {
        switch(transferType) {
            case DataBuffer.TYPE_BYTE:
            case DataBuffer.TYPE_USHORT:
            case DataBuffer.TYPE_INT:
                if (origBits != null) {
                    return origBits;
                }
                break;
            default:
                break;
        }
        int numBits = DataBuffer.getDataTypeSize(transferType);
        int numComponents = colorSpace.getNumComponents();
        if (hasAlpha) {
            ++numComponents;
        }
        int[] bits = new int[numComponents];
        for (int i = 0; i < numComponents; i++) {
            bits[i] = numBits;
        }
        return bits;
    }

    private void setupLUTs() {
        // REMIND: there is potential to accelerate sRGB, LinearRGB,
        // LinearGray, ICCGray, and non-ICC Gray spaces with non-standard
        // scaling, if that becomes important
        //
        // NOTE: The is_xxx_stdScale and nonStdScale booleans are provisionally
        // set here when this method is called at construction time.  These
        // variables may be set again when initScale is called later.
        // When setupLUTs returns, nonStdScale is true if (the transferType
        // is not float or double) AND (some minimum ColorSpace component
        // value is not 0.0 OR some maximum ColorSpace component value
        // is not 1.0).  This is correct for the calls to
        // getNormalizedComponents(Object, float[], int) from initScale().
        // initScale() may change the value nonStdScale based on the
        // return value of getNormalizedComponents() - this will only
        // happen if getNormalizedComponents() has been overridden by a
        // subclass to make the mapping of min/max pixel sample values
        // something different from min/max color component values.
        if (is_sRGB) {
            is_sRGB_stdScale = true;
            nonStdScale = false;
        } else if (ColorModel.isLinearRGBspace(colorSpace)) {
            // Note that the built-in Linear RGB space has a normalized
            // range of 0.0 - 1.0 for each coordinate.  Usage of these
            // LUTs makes that assumption.
            is_LinearRGB_stdScale = true;
            nonStdScale = false;
            if (transferType == DataBuffer.TYPE_BYTE) {
                tosRGB8LUT = ColorModel.getLinearRGB8TosRGB8LUT();
                fromsRGB8LUT8 = ColorModel.getsRGB8ToLinearRGB8LUT();
            } else {
                tosRGB8LUT = ColorModel.getLinearRGB16TosRGB8LUT();
                fromsRGB8LUT16 = ColorModel.getsRGB8ToLinearRGB16LUT();
            }
        } else if ((colorSpaceType == ColorSpace.TYPE_GRAY) &&
                   (colorSpace instanceof ICC_ColorSpace) &&
                   (colorSpace.getMinValue(0) == 0.0f) &&
                   (colorSpace.getMaxValue(0) == 1.0f)) {
            // Note that a normalized range of 0.0 - 1.0 for the gray
            // component is required, because usage of these LUTs makes
            // that assumption.
            ICC_ColorSpace ics = (ICC_ColorSpace) colorSpace;
            is_ICCGray_stdScale = true;
            nonStdScale = false;
            fromsRGB8LUT16 = ColorModel.getsRGB8ToLinearRGB16LUT();
            if (ColorModel.isLinearGRAYspace(ics)) {
                is_LinearGray_stdScale = true;
                if (transferType == DataBuffer.TYPE_BYTE) {
                    tosRGB8LUT = ColorModel.getGray8TosRGB8LUT(ics);
                } else {
                    tosRGB8LUT = ColorModel.getGray16TosRGB8LUT(ics);
                }
            } else {
                if (transferType == DataBuffer.TYPE_BYTE) {
                    tosRGB8LUT = ColorModel.getGray8TosRGB8LUT(ics);
                    fromLinearGray16ToOtherGray8LUT =
                        ColorModel.getLinearGray16ToOtherGray8LUT(ics);
                } else {
                    tosRGB8LUT = ColorModel.getGray16TosRGB8LUT(ics);
                    fromLinearGray16ToOtherGray16LUT =
                        ColorModel.getLinearGray16ToOtherGray16LUT(ics);
                }
            }
        } else if (needScaleInit) {
            // if transferType is byte, ushort, int, or short and we
            // don't already know the ColorSpace has minVlaue == 0.0f and
            // maxValue == 1.0f for all components, we need to check that
            // now and setup the min[] and diffMinMax[] arrays if necessary.
            nonStdScale = false;
            for (int i = 0; i < numColorComponents; i++) {
                if ((colorSpace.getMinValue(i) != 0.0f) ||
                    (colorSpace.getMaxValue(i) != 1.0f)) {
                    nonStdScale = true;
                    break;
                }
            }
            if (nonStdScale) {
                min = new float[numColorComponents];
                diffMinMax = new float[numColorComponents];
                for (int i = 0; i < numColorComponents; i++) {
                    min[i] = colorSpace.getMinValue(i);
                    diffMinMax[i] = colorSpace.getMaxValue(i) - min[i];
                }
            }
        }
    }

    private void initScale() {
        // This method is called the first time any method which uses
        // pixel sample value to color component value scaling information
        // is called if the transferType supports non-standard scaling
        // as defined above (byte, ushort, int, and short), unless the
        // method is getNormalizedComponents(Object, float[], int) (that
        // method must be overridden to use non-standard scaling).  This
        // method also sets up the noUnnorm boolean variable for these
        // transferTypes.  After this method is called, the nonStdScale
        // variable will be true if getNormalizedComponents() maps a
        // sample value of 0 to anything other than 0.0f OR maps a
        // sample value of 2^^n - 1 (2^^15 - 1 for short transferType)
        // to anything other than 1.0f.  Note that this can be independent
        // of the colorSpace min/max component values, if the
        // getNormalizedComponents() method has been overridden for some
        // reason, e.g. to provide greater dynamic range in the sample
        // values than in the color component values.  Unfortunately,
        // this method can't be called at construction time, since a
        // subclass may still have uninitialized state that would cause
        // getNormalizedComponents() to return an incorrect result.
        needScaleInit = false; // only needs to called once
        if (nonStdScale || signed) {
            // The unnormalized form is only supported for unsigned
            // transferTypes and when the ColorSpace min/max values
            // are 0.0/1.0.  When this method is called nonStdScale is
            // true if the latter condition does not hold.  In addition,
            // the unnormalized form requires that the full range of
            // the pixel sample values map to the full 0.0 - 1.0 range
            // of color component values.  That condition is checked
            // later in this method.
            noUnnorm = true;
        } else {
            noUnnorm = false;
        }
        float[] lowVal, highVal;
        switch (transferType) {
        case DataBuffer.TYPE_BYTE:
            {
                byte[] bpixel = new byte[numComponents];
                for (int i = 0; i < numColorComponents; i++) {
                    bpixel[i] = 0;
                }
                if (supportsAlpha) {
                    bpixel[numColorComponents] =
                        (byte) ((1 << nBits[numColorComponents]) - 1);
                }
                lowVal = getNormalizedComponents(bpixel, null, 0);
                for (int i = 0; i < numColorComponents; i++) {
                    bpixel[i] = (byte) ((1 << nBits[i]) - 1);
                }
                highVal = getNormalizedComponents(bpixel, null, 0);
            }
            break;
        case DataBuffer.TYPE_USHORT:
            {
                short[] uspixel = new short[numComponents];
                for (int i = 0; i < numColorComponents; i++) {
                    uspixel[i] = 0;
                }
                if (supportsAlpha) {
                    uspixel[numColorComponents] =
                        (short) ((1 << nBits[numColorComponents]) - 1);
                }
                lowVal = getNormalizedComponents(uspixel, null, 0);
                for (int i = 0; i < numColorComponents; i++) {
                    uspixel[i] = (short) ((1 << nBits[i]) - 1);
                }
                highVal = getNormalizedComponents(uspixel, null, 0);
            }
            break;
        case DataBuffer.TYPE_INT:
            {
                int[] ipixel = new int[numComponents];
                for (int i = 0; i < numColorComponents; i++) {
                    ipixel[i] = 0;
                }
                if (supportsAlpha) {
                    ipixel[numColorComponents] =
                        ((1 << nBits[numColorComponents]) - 1);
                }
                lowVal = getNormalizedComponents(ipixel, null, 0);
                for (int i = 0; i < numColorComponents; i++) {
                    ipixel[i] = ((1 << nBits[i]) - 1);
                }
                highVal = getNormalizedComponents(ipixel, null, 0);
            }
            break;
        case DataBuffer.TYPE_SHORT:
            {
                short[] spixel = new short[numComponents];
                for (int i = 0; i < numColorComponents; i++) {
                    spixel[i] = 0;
                }
                if (supportsAlpha) {
                    spixel[numColorComponents] = 32767;
                }