1 /*
2 * Copyright (C) 2014 Peter Olsson
3 *
4 * Copyright (C) 2003 Maxim Stepin ( maxst@hiend3d.com )
5 *
6 * Copyright (C) 2010 Cameron Zemek ( grom@zeminvaders.net)
7 * Copyright (C) 2011 Francois Gannaz <mytskine@gmail.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #ifndef __HQX_COMMON_H_
25 #define __HQX_COMMON_H_
26
27 #include <stdlib.h>
28 #include <stdint.h>
29
30 #define MASK_2 0x0000FF00
31 #define MASK_13 0x00FF00FF
32 #define MASK_RGB 0x00FFFFFF
33 #define MASK_ALPHA 0xFF000000
34
35 #define Ymask 0x00FF0000
36 #define Umask 0x0000FF00
37 #define Vmask 0x000000FF
38 #define trY 0x00300000
39 #define trU 0x00000700
40 #define trV 0x00000006
41
42 /* RGB to YUV lookup table (now a pointer) */
43 extern uint32_t* RGBtoYUV;
44
rgb_to_yuv(uint32_t c)45 static inline uint32_t rgb_to_yuv(uint32_t c)
46 {
47 // Mask against MASK_RGB to discard the alpha channel
48 return RGBtoYUV[MASK_RGB & c];
49 }
50
51 /* Test if there is difference in color */
yuv_diff(uint32_t yuv1,uint32_t yuv2)52 static inline int yuv_diff(uint32_t yuv1, uint32_t yuv2) {
53 return (( abs(static_cast<int>(yuv1 & Ymask) - static_cast<int>(yuv2 & Ymask)) > trY ) ||
54 ( abs(static_cast<int>(yuv1 & Umask) - static_cast<int>(yuv2 & Umask)) > trU ) ||
55 ( abs(static_cast<int>(yuv1 & Vmask) - static_cast<int>(yuv2 & Vmask)) > trV ) );
56 }
57
Diff(uint32_t c1,uint32_t c2)58 static inline int Diff(uint32_t c1, uint32_t c2)
59 {
60 return yuv_diff(rgb_to_yuv(c1), rgb_to_yuv(c2));
61 }
62
63 /* Interpolate functions */
Interpolate_2(uint32_t c1,int w1,uint32_t c2,int w2,int s)64 static inline uint32_t Interpolate_2(uint32_t c1, int w1, uint32_t c2, int w2, int s)
65 {
66 if (c1 == c2) {
67 return c1;
68 }
69 return
70 (((((c1 & MASK_ALPHA) >> 24) * w1 + ((c2 & MASK_ALPHA) >> 24) * w2) << (24-s)) & MASK_ALPHA) +
71 ((((c1 & MASK_2) * w1 + (c2 & MASK_2) * w2) >> s) & MASK_2) +
72 ((((c1 & MASK_13) * w1 + (c2 & MASK_13) * w2) >> s) & MASK_13);
73 }
74
Interpolate_3(uint32_t c1,int w1,uint32_t c2,int w2,uint32_t c3,int w3,int s)75 static inline uint32_t Interpolate_3(uint32_t c1, int w1, uint32_t c2, int w2, uint32_t c3, int w3, int s)
76 {
77 return
78 (((((c1 & MASK_ALPHA) >> 24) * w1 + ((c2 & MASK_ALPHA) >> 24) * w2 + ((c3 & MASK_ALPHA) >> 24) * w3) << (24-s)) & MASK_ALPHA) +
79 ((((c1 & MASK_2) * w1 + (c2 & MASK_2) * w2 + (c3 & MASK_2) * w3) >> s) & MASK_2) +
80 ((((c1 & MASK_13) * w1 + (c2 & MASK_13) * w2 + (c3 & MASK_13) * w3) >> s) & MASK_13);
81 }
82
Interp1(uint32_t c1,uint32_t c2)83 static inline uint32_t Interp1(uint32_t c1, uint32_t c2)
84 {
85 //(c1*3+c2) >> 2;
86 return Interpolate_2(c1, 3, c2, 1, 2);
87 }
88
Interp2(uint32_t c1,uint32_t c2,uint32_t c3)89 static inline uint32_t Interp2(uint32_t c1, uint32_t c2, uint32_t c3)
90 {
91 //(c1*2+c2+c3) >> 2;
92 return Interpolate_3(c1, 2, c2, 1, c3, 1, 2);
93 }
94
Interp3(uint32_t c1,uint32_t c2)95 static inline uint32_t Interp3(uint32_t c1, uint32_t c2)
96 {
97 //(c1*7+c2)/8;
98 return Interpolate_2(c1, 7, c2, 1, 3);
99 }
100
Interp4(uint32_t c1,uint32_t c2,uint32_t c3)101 static inline uint32_t Interp4(uint32_t c1, uint32_t c2, uint32_t c3)
102 {
103 //(c1*2+(c2+c3)*7)/16;
104 return Interpolate_3(c1, 2, c2, 7, c3, 7, 4);
105 }
106
Interp5(uint32_t c1,uint32_t c2)107 static inline uint32_t Interp5(uint32_t c1, uint32_t c2)
108 {
109 //(c1+c2) >> 1;
110 return Interpolate_2(c1, 1, c2, 1, 1);
111 }
112
Interp6(uint32_t c1,uint32_t c2,uint32_t c3)113 static inline uint32_t Interp6(uint32_t c1, uint32_t c2, uint32_t c3)
114 {
115 //(c1*5+c2*2+c3)/8;
116 return Interpolate_3(c1, 5, c2, 2, c3, 1, 3);
117 }
118
Interp7(uint32_t c1,uint32_t c2,uint32_t c3)119 static inline uint32_t Interp7(uint32_t c1, uint32_t c2, uint32_t c3)
120 {
121 //(c1*6+c2+c3)/8;
122 return Interpolate_3(c1, 6, c2, 1, c3, 1, 3);
123 }
124
Interp8(uint32_t c1,uint32_t c2)125 static inline uint32_t Interp8(uint32_t c1, uint32_t c2)
126 {
127 //(c1*5+c2*3)/8;
128 return Interpolate_2(c1, 5, c2, 3, 3);
129 }
130
Interp9(uint32_t c1,uint32_t c2,uint32_t c3)131 static inline uint32_t Interp9(uint32_t c1, uint32_t c2, uint32_t c3)
132 {
133 //(c1*2+(c2+c3)*3)/8;
134 return Interpolate_3(c1, 2, c2, 3, c3, 3, 3);
135 }
136
Interp10(uint32_t c1,uint32_t c2,uint32_t c3)137 static inline uint32_t Interp10(uint32_t c1, uint32_t c2, uint32_t c3)
138 {
139 //(c1*14+c2+c3)/16;
140 return Interpolate_3(c1, 14, c2, 1, c3, 1, 4);
141 }
142
143 #endif
144