/*
 * 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"

// 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); \
}


// BLEND_INVERT
#define BLEND_INVERT(d, a) \
{ \
	pixel32 _p; \
	_p.data32 = *(uint32*)d; \
	BLEND(d, 255 - _p.data8[2], 255 - _p.data8[1], 255 - _p.data8[0], a); \
}


// ASSIGN_INVERT
#define ASSIGN_INVERT(d) \
{ \
	pixel32 _p; \
	_p.data32 = *(uint32*)d; \
	d[0] = 255 - _p.data8[0]; \
	d[1] = 255 - _p.data8[1]; \
	d[2] = 255 - _p.data8[2]; \
	d[3] = 255; \
}


// blend_hline_invert_subpix
void
blend_hline_invert_subpix(int x, int y, unsigned len, const color_type& c,
	uint8 cover, agg_buffer* buffer, const PatternHandler* pattern)
{
	uint8* p = buffer->row_ptr(y) + (x << 2);
	if(cover == 255) {
		do {
			if (pattern->IsHighColor(x, y)) {
				ASSIGN_INVERT(p);
			}
			x++;
			p += 4;
			len -= 3;
		} while (len);
	} else {
		do {
			if (pattern->IsHighColor(x, y)) {
				BLEND_INVERT(p, cover);
			}
			x++;
			p += 4;
			len -= 3;
		} while (len);
	}
}


// 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);
	do {
		if (pattern->IsHighColor(x, y))
			BLEND_INVERT_SUBPIX(p, covers[2], covers[1], covers[0]);
		covers += 3;
		p += 4;
		x++;
		len -= 3;
	} while (len);
}


#endif // DRAWING_MODE_INVERT_SUBPIX_H