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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.hwmf.record;

/**
 * The BinaryRasterOperation Enumeration section lists the binary raster-operation codes.
 * Rasteroperation codes define how metafile processing combines the bits from the selected
 * pen with the bits in the destination bitmap.
 *
 * Each raster-operation code represents a Boolean operation in which the values of the pixels in the
 * selected pen and the destination bitmap are combined. Following are the two operands used in these
 * operations.
 *
 * <table>
 * <tr><th>Operand</th><th>Meaning</th></tr>
 * <tr><td>P</td><td>Selected pen</td></tr>
 * <tr><td>D</td><td>Destination bitmap</td></tr>
 * </table>
 *
 * Following are the Boolean operators used in these operations.
 * <table>
 * <tr><th>Operand</th><th>Meaning</th></tr>
 * <tr><td>a</td><td>Bitwise AND</td></tr>
 * <tr><td>n</td><td>Bitwise NOT (inverse)</td></tr>
 * <tr><td>o</td><td>Bitwise OR</td></tr>
 * <tr><td>x</td><td>Bitwise exclusive OR (XOR)</td></tr>
 * </table>
 *
 * All Boolean operations are presented in reverse Polish notation. For example, the following
 * operation replaces the values of the pixels in the destination bitmap with a combination of the pixel
 * values of the pen and the selected brush: DPo.
 *
 * Each raster-operation code is a 32-bit integer whose high-order word is a Boolean operation index and
 * whose low-order word is the operation code. The 16-bit operation index is a zero-extended, 8-bit
 * value that represents all possible outcomes resulting from the Boolean operation on two parameters
 * (in this case, the pen and destination values). For example, the operation indexes for the DPo and
 * DPan operations are shown in the following list.
 *
 * <table>
 * <tr><th>P</th><th>D</th><th>DPo</th><th>DPan</th></tr>
 * <tr><td>0</td><td>0</td><td>0</td><td>1</td></tr>
 * <tr><td>0</td><td>1</td><td>1</td><td>1</td></tr>
 * <tr><td>1</td><td>0</td><td>1</td><td>1</td></tr>
 * <tr><td>1</td><td>1</td><td>1</td><td>0</td></tr>
 * </table>
 *
 */
public enum HwmfBinaryRasterOp {
    /** 0, Pixel is always 0 */
    R2_BLACK(0x0001),
    /** DPon, Pixel is the inverse of the R2_MERGEPEN color. */
    R2_NOTMERGEPEN(0x0002),
    /** DPna, Pixel is a combination of the screen color and the inverse of the pen color. */
    R2_MASKNOTPEN(0x0003),
    /** Pn, Pixel is the inverse of the pen color. */
    R2_NOTCOPYPEN(0x0004),
    /** PDna, Pixel is a combination of the colors common to both the pen and the inverse of the screen. */
    R2_MASKPENNOT(0x0005),
    /** Dn, Pixel is the inverse of the screen color. */
    R2_NOT(0x0006),
    /** DPx, Pixel is a combination of the colors in the pen or in the screen, but not in both. */
    R2_XORPEN(0x0007),
    /** DPan, Pixel is the inverse of the R2_MASKPEN color. */
    R2_NOTMASKPEN(0x0008),
    /** DPa, Pixel is a combination of the colors common to both the pen and the screen. */
    R2_MASKPEN(0x0009),
    /** DPxn, Pixel is the inverse of the R2_XORPEN color. */
    R2_NOTXORPEN(0x000A),
    /** D, Pixel remains unchanged. */
    R2_NOP(0x000B),
    /** DPno, Pixel is a combination of the colors common to both the screen and the inverse of the pen. */
    R2_MERGENOTPEN(0x000C),
    /** P, Pixel is the pen color. */
    R2_COPYPEN(0x000D),
    /** PDno, Pixel is a combination of the pen color and the inverse of the screen color.*/
    R2_MERGEPENNOT(0x000E),
    /** DPo, Pixel is a combination of the pen color and the screen color. */
    R2_MERGEPEN(0x000F),
    /** 1, Pixel is always 1 */
    R2_WHITE(0x0010);

    int opIndex;

    HwmfBinaryRasterOp(int opIndex) {
        this.opIndex=opIndex;
    }

    public static HwmfBinaryRasterOp valueOf(int opIndex) {
        for (HwmfBinaryRasterOp bb : HwmfBinaryRasterOp.values()) {
            if (bb.opIndex == opIndex) {
                return bb;
            }
        }
        return null;
    }

}