aboutsummaryrefslogtreecommitdiff
path: root/graphics/scaler/intern.h
blob: eddc3c7f3ded6eb5f7af59cc37670345b2c465d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#ifndef GRAPHICS_SCALER_INTERN_H
#define GRAPHICS_SCALER_INTERN_H

#include "common/scummsys.h"
#include "graphics/colormasks.h"


/**
 * Interpolate two 16 bit pixel *pairs* at once with equal weights 1.
 * In particular, p1 and p2 can contain two pixels each in the upper
 * and lower halves.
 */
template<typename ColorMask>
static inline uint32 interpolate32_1_1(uint32 p1, uint32 p2) {
	return (((p1 & ColorMask::kHighBitsMask) >> 1) +
	        ((p2 & ColorMask::kHighBitsMask) >> 1) +
	         (p1 & p2 & ColorMask::kLowBitsMask));
}

/**
 * Interpolate two 16 bit pixel *pairs* at once with weights 3 resp. 1.
 * In particular, p1 and p2 can contain two pixels/each in the upper
 * and lower halves.
 */
template<typename ColorMask>
static inline uint32 interpolate32_3_1(uint32 p1, uint32 p2) {
	uint32 x = ((p1 & ColorMask::qhighBits) >> 2) * 3 + ((p2 & ColorMask::qhighBits) >> 2);
	uint32 y = ((p1 & ColorMask::qlowBits) * 3 + (p2 & ColorMask::qlowBits)) >> 2;

	y &= ColorMask::qlowBits;
	return x + y;
}

/**
 * Interpolate two 16 bit pixels with weights 1 and 1, i.e., (p1+p2)/2.
 * See <http://www.slack.net/~ant/info/rgb_mixing.html> for details on how this works.
 */
template<typename ColorMask>
static inline unsigned interpolate16_1_1(unsigned p1, unsigned p2) {
	const unsigned lowbits = (p1 ^ p2) & ColorMask::kLowBits;
	return ((p1 + p2) - lowbits) >> 1;
}

/**
 * Interpolate two 16 bit pixels with weights 3 and 1, i.e., (3*p1+p2)/4.
 */
template<typename ColorMask>
static inline unsigned interpolate16_3_1(unsigned p1, unsigned p2) {
	const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 1) + (p1 & ColorMask::kLow2Bits)
		                   + (p2 & ColorMask::kLow2Bits)) & ColorMask::kLow2Bits;
	return ((p1*3 + p2) - lowbits) >> 2;
}

/**
 * Interpolate two 16 bit pixels with weights 5 and 3 and 1, i.e., (5*p1+3*p2)/8.
 */
template<typename ColorMask>
static inline unsigned interpolate16_5_3(unsigned p1, unsigned p2) {
	const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + (p1 & ColorMask::kLow3Bits)
		                   + ((p2 & ColorMask::kLow2Bits) << 1) + (p2 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
	return ((p1*5 + p2*3) - lowbits) >> 3;
}

/**
 * Interpolate two 16 bit pixels with weights 7 and 1, i.e., (7*p1+p2)/8.
 */
template<typename ColorMask>
static inline unsigned interpolate16_7_1(unsigned p1, unsigned p2) {
	const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + ((p1 & ColorMask::kLow2Bits) << 1) + (p1 & ColorMask::kLow3Bits)
		                   +  (p2 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
	return ((p1*7+p2) - lowbits) >> 3;
}

/**
 * Interpolate three 16 bit pixels with weights 2, 1, and 1, i.e., (2*p1+p2+p3)/4.
 */
template<typename ColorMask>
static inline unsigned interpolate16_2_1_1(unsigned p1, unsigned p2, unsigned p3) {
	p1<<=1;
	const unsigned lowbits = ((p1 & (ColorMask::kLowBits << 1))
		                   +  (p2 & ColorMask::kLow2Bits)
		                   +  (p3 & ColorMask::kLow2Bits)) & ColorMask::kLow2Bits;
	return ((p1+p2+p3) - lowbits) >> 2;
}

/**
 * Interpolate three 16 bit pixels with weights 5, 2, and 1, i.e., (5*p1+2*p2+p3)/8.
 */
template<typename ColorMask>
static inline unsigned interpolate16_5_2_1(unsigned p1, unsigned p2, unsigned p3) {
	p2<<=1;
	const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + (p1 & ColorMask::kLow3Bits)
		                   +  (p2 & (ColorMask::kLow2Bits << 1))
		                   +  (p3 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
	return ((p1*5 + p2 + p3) - lowbits) >> 3;
}

/**
 * Interpolate three 16 bit pixels with weights 6, 1, and 1, i.e., (6*p1+p2+p3)/8.
 */
template<typename ColorMask>
static inline unsigned interpolate16_6_1_1(unsigned p1, unsigned p2, unsigned p3) {
	const unsigned lowbits = (((((p1 & ColorMask::kLowBits) << 1) + (p1 & ColorMask::kLow2Bits)) << 1)
		                   + (p2 & ColorMask::kLow3Bits)
		                   + (p3 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
	return ((p1*6 + p2 + p3) - lowbits) >> 3;
}

/**
 * Interpolate three 16 bit pixels with weights 2, 3, and 3, i.e., (2*p1+3*(p2+p3))/8.
 */
template<typename ColorMask>
static inline unsigned interpolate16_2_3_3(unsigned p1, unsigned p2, unsigned p3) {
	p1 <<= 1;
	const unsigned rb = (p1 & (ColorMask::kRedBlueMask<<1))
		              + ((p2 & ColorMask::kRedBlueMask) + (p3 & ColorMask::kRedBlueMask))*3;
	const unsigned  g = (p1 & (ColorMask::kGreenMask<<1))
		              + ((p2 & ColorMask::kGreenMask) + (p3 & ColorMask::kGreenMask))*3;
	return ((rb & (ColorMask::kRedBlueMask<<3)) | (g & (ColorMask::kGreenMask<<3))) >> 3;
}

/**
 * Interpolate three 16 bit pixels with weights 2, 7, and 7, i.e., (2*p1+7*(p2+p3))/16.
 */
template<typename ColorMask>
static inline unsigned interpolate16_2_7_7(unsigned p1, unsigned p2, unsigned p3) {
	p1 <<= 1;
	const unsigned rb = (p1 & (ColorMask::kRedBlueMask<<1))
		              + ((p2 & ColorMask::kRedBlueMask) + (p3 & ColorMask::kRedBlueMask))*7;
	const unsigned  g = (p1 & (ColorMask::kGreenMask<<1))
		              + ((p2 & ColorMask::kGreenMask) + (p3 & ColorMask::kGreenMask))*7;
	return ((rb & (ColorMask::kRedBlueMask<<4)) | (g & (ColorMask::kGreenMask<<4))) >> 4;
}

/**
 * Interpolate three 16 bit pixels with weights 14, 1, and 1, i.e., (14*p1+p2+p3)/16.
 */
template<typename ColorMask>
static inline unsigned interpolate16_14_1_1(unsigned p1, unsigned p2, unsigned p3) {
	const unsigned rb = (p1&ColorMask::kRedBlueMask)*14
	                  + (p2&ColorMask::kRedBlueMask)
	                  + (p3&ColorMask::kRedBlueMask);
	const unsigned  g = (p1&ColorMask::kGreenMask)*14
	                  + (p2&ColorMask::kGreenMask) + (p3&ColorMask::kGreenMask);
	return ((rb&(ColorMask::kRedBlueMask<<4)) | (g&(ColorMask::kGreenMask<<4))) >> 4;
}

/**
 * Interpolate four 16 bit pixels with weights 1, 1, 1, and 1, i.e., (p1+p2+p3+p4)/4.
 */
template<typename ColorMask>
static inline unsigned interpolate16_1_1_1_1(unsigned p1, unsigned p2, unsigned p3, unsigned p4) {
	const unsigned lowbits = ((p1 & ColorMask::kLow2Bits)
		                   +  (p2 & ColorMask::kLow2Bits)
		                   +  (p3 & ColorMask::kLow2Bits)
		                   +  (p4 & ColorMask::kLow2Bits)) & ColorMask::kLow2Bits;
	return ((p1+p2+p3+p4) - lowbits) >> 2;
}

/**
 * Compare two YUV values (encoded 8-8-8) and check if they differ by more than
 * a certain hard coded threshold. Used by the hq scaler family.
 */
static inline bool diffYUV(int yuv1, int yuv2) {
	static const int Ymask = 0x00FF0000;
	static const int Umask = 0x0000FF00;
	static const int Vmask = 0x000000FF;
	static const int trY   = 0x00300000;
	static const int trU   = 0x00000700;
	static const int trV   = 0x00000006;

	int diff;
	int mask;

	diff = ((yuv1 & Umask) - (yuv2 & Umask));
	mask = diff >> 31; // -1 if value < 0, 0 otherwise
	diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
	if (diff > trU) return true;

	diff = ((yuv1 & Vmask) - (yuv2 & Vmask));
	mask = diff >> 31; // -1 if value < 0, 0 otherwise
	diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
	if (diff > trV) return true;

	diff = ((yuv1 & Ymask) - (yuv2 & Ymask));
	mask = diff >> 31; // -1 if value < 0, 0 otherwise
	diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
	if (diff > trY) return true;

	return false;
/*
	return
	  ( ( ABS((yuv1 & Ymask) - (yuv2 & Ymask)) > trY ) ||
	    ( ABS((yuv1 & Umask) - (yuv2 & Umask)) > trU ) ||
	    ( ABS((yuv1 & Vmask) - (yuv2 & Vmask)) > trV ) );
*/
}

#endif