/*
 * Copyright 2005, Stephan Aßmus <superstippi@gmx.de>.
 * Copyright 2008, Andrej Spielmann <andrej.spielmann@seh.ox.ac.uk>.
 * All rights reserved. Distributed under the terms of the MIT License.
 *
 * DrawingMode implementing B_OP_INVERT on B_RGBA32.
 *
 */

#ifndef DRAWING_MODE_INVERT_SUBPIX_H
#define DRAWING_MODE_INVERT_SUBPIX_H

#include "DrawingMode.h"
#include "GlobalSubpixelSettings.h"

// BLEND_INVERT_SUBPIX
#define BLEND_INVERT_SUBPIX(d, a1, a2, a3) \
{ \
        pixel32 _p; \
        _p.data32 = *(uint32*)d; \
        BLEND_SUBPIX(d, 255 - _p.data8[2], 255 - _p.data8[1], 255 - _p.data8[0], \
                                        a1, a2, a3); \
        (void)_p; \
}


// blend_solid_hspan_invert_subpix
void
blend_solid_hspan_invert_subpix(int x, int y, unsigned len, const color_type& c,
        const uint8* covers, agg_buffer* buffer, const PatternHandler* pattern)
{
        uint8* p = buffer->row_ptr(y) + (x << 2);
        const int subpixelL = gSubpixelOrderingRGB ? 2 : 0;
        const int subpixelM = 1;
        const int subpixelR = gSubpixelOrderingRGB ? 0 : 2;
        do {
                if (pattern->IsHighColor(x, y)) {
                        BLEND_INVERT_SUBPIX(p, covers[subpixelL], covers[subpixelM],
                                covers[subpixelR]);
                }
                covers += 3;
                p += 4;
                x++;
                len -= 3;
        } while (len);
}


#endif // DRAWING_MODE_INVERT_SUBPIX_H