/* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and /or associated documentation files

 * (the "Materials "), to deal in the Materials without restriction,

 * including without limitation the rights to use, copy, modify, merge,

 * publish, distribute, sublicense, and/or sell copies of the Materials,

 * and to permit persons to whom the Materials are furnished to do so,

 * subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Materials.

 *

 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR

 * THE USE OR OTHER DEALINGS IN THE MATERIALS.

 */

#ifndef __SFMASK_H

#define __SFMASK_H

#include "VG/openvg.h"

#ifndef __RIDEFS_H

#   include "riDefs.h"

#endif

#ifndef __RIIMAGE_H

#   include "riImage.h"

#endif

// Contains implementations of some mask operations that are needed in both the

// pixel-pipeline and the blitter.

namespace OpenVGRI {

RI_INLINE IntegerColor intMaskOperation(RIuint32 coverage, const IntegerColor& d, VGMaskOperation maskOperation);

RI_INLINE IntegerColor intMaskOperation(RIuint32 coverage, const IntegerColor& d, VGMaskOperation maskOperation)

{

    RIuint32 newCoverage;

    switch (maskOperation)

    {

        case VG_SET_MASK:

            // \note This should work approximately if coverage < 256 always.

            // See other cases for proper conversions.

            return IntegerColor(0, 0, 0, coverage); // nop.

            break;

        case VG_UNION_MASK:

        {

            RIuint32 oldCoverage = d.a;

            oldCoverage += (oldCoverage >> 7);

            RIuint32 im = 256 - coverage;

            RIuint32 ip = 256 - oldCoverage;

            newCoverage = 256 - ((im * ip) >> 8);

            break;

        }

        case VG_INTERSECT_MASK:

        {

            RIuint32 oldCoverage = d.a;

            oldCoverage += (oldCoverage >> 7);

            newCoverage = (coverage * oldCoverage) >> 8;

            break;

        }

        default:

        {

            RI_ASSERT(maskOperation == VG_SUBTRACT_MASK);

            RIuint32 im = 256 - coverage;

            RIuint32 oldCoverage = d.a;

            oldCoverage += (oldCoverage >> 7);

            newCoverage = (oldCoverage * im) >> 8;

            break;

        }

    }

    return IntegerColor(0, 0, 0, newCoverage - (newCoverage >> 8));

}

}

#endif