1/*
2 * Copyright 2005, Stephan Aßmus <superstippi@gmx.de>.
3 * Copyright 2008, Andrej Spielmann <andrej.spielmann@seh.ox.ac.uk>.
4 * All rights reserved. Distributed under the terms of the MIT License.
5 *
6 * DrawingMode implementing B_OP_ADD on B_RGBA32.
7 *
8 */
9
10#ifndef DRAWING_MODE_BLEND_SUBPIX_H
11#define DRAWING_MODE_BLEND_SUBPIX_H
12
13#include "DrawingMode.h"
14#include "GlobalSubpixelSettings.h"
15
16
17// BLEND_BLEND_SUBPIX
18#define BLEND_BLEND_SUBPIX(d, r, g, b, a1, a2, a3) \
19{ \
20	pixel32 _p; \
21	_p.data32 = *(uint32*)d; \
22	uint8 bt = (_p.data8[0] + (b)) >> 1; \
23	uint8 gt = (_p.data8[1] + (g)) >> 1; \
24	uint8 rt = (_p.data8[2] + (r)) >> 1; \
25	BLEND_SUBPIX(d, rt, gt, bt, a1, a2, a3); \
26}
27
28
29// blend_solid_hspan_blend_subpix
30void
31blend_solid_hspan_blend_subpix(int x, int y, unsigned len, const color_type& c,
32	const uint8* covers, agg_buffer* buffer, const PatternHandler* pattern)
33{
34	uint8* p = buffer->row_ptr(y) + (x << 2);
35	const int subpixelL = gSubpixelOrderingRGB ? 2 : 0;
36	const int subpixelM = 1;
37	const int subpixelR = gSubpixelOrderingRGB ? 0 : 2;
38	do {
39		rgb_color color = pattern->ColorAt(x, y);
40		BLEND_BLEND_SUBPIX(p, color.red, color.green, color.blue,
41			covers[subpixelL], covers[subpixelM], covers[subpixelR]);
42		covers += 3;
43		p += 4;
44		x++;
45		len -= 3;
46	} while (len);
47}
48
49
50#endif // DRAWING_MODE_BLEND_SUBPIX_H
51
52