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_ADD_SUBPIX_H
11#define DRAWING_MODE_ADD_SUBPIX_H
12
13#include "DrawingMode.h"
14#include "GlobalSubpixelSettings.h"
15
16// BLEND_ADD_SUBPIX
17#define BLEND_ADD_SUBPIX(d, r, g, b, a1, a2, a3) \
18{ \
19	pixel32 _p; \
20	_p.data32 = *(uint32*)d; \
21	uint8 rt = min_c(255, _p.data8[2] + (r)); \
22	uint8 gt = min_c(255, _p.data8[1] + (g)); \
23	uint8 bt = min_c(255, _p.data8[0] + (b)); \
24	BLEND_SUBPIX(d, rt, gt, bt, a1, a2, a3); \
25}
26
27
28// blend_solid_hspan_add_subpix
29void
30blend_solid_hspan_add_subpix(int x, int y, unsigned len, const color_type& c,
31	const uint8* covers, agg_buffer* buffer, const PatternHandler* pattern)
32{
33	const int subpixelL = gSubpixelOrderingRGB ? 2 : 0;
34	const int subpixelM = 1;
35	const int subpixelR = gSubpixelOrderingRGB ? 0 : 2;
36	uint8* p = buffer->row_ptr(y) + (x << 2);
37	do {
38		rgb_color color = pattern->ColorAt(x, y);
39		BLEND_ADD_SUBPIX(p, color.red, color.green, color.blue,
40			covers[subpixelL], covers[subpixelM], covers[subpixelR]);
41		covers += 3;
42		p += 4;
43		x++;
44		len -= 3;
45	} while (len);
46}
47
48
49#endif // DRAWING_MODE_ADD_SUBPIX_H
50
51