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Comparing cf.schmorp.de/server/utils/cfhq2xa.C (file contents):
Revision 1.1 by root, Sun Apr 1 00:36:35 2007 UTC vs.
Revision 1.16 by root, Sat Nov 17 23:40:05 2018 UTC

1//hq2xa filter 1/*
2//---------------------------------------------------------- 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
5 * Copyright (©) 2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
3//Copyright (C) 2003 MaxSt ( maxst@hiend3d.com ) 6 * Copyright (©) 2003 MaxSt <maxst@hiend3d.com>
4//Copyright (C) 2006 Marc Lehmann <pcg@goof.com> 7 *
5// converted to RGBA, cleaned up 8 * Deliantra is free software: you can redistribute it and/or modify it under
6 9 * the terms of the Affero GNU General Public License as published by the
7//This program is free software; you can redistribute it and/or 10 * Free Software Foundation, either version 3 of the License, or (at your
8//modify it under the terms of the GNU Lesser General Public 11 * option) any later version.
9//License as published by the Free Software Foundation; either 12 *
10//version 2.1 of the License, or (at your option) any later version.
11//
12//This program is distributed in the hope that it will be useful, 13 * This program is distributed in the hope that it will be useful,
13//but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15//Lesser General Public License for more details. 16 * GNU General Public License for more details.
16// 17 *
17//You should have received a copy of the GNU Lesser General Public 18 * You should have received a copy of the Affero GNU General Public License
18//License along with this program; if not, write to the Free Software 19 * and the GNU General Public License along with this program. If not, see
19//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * <http://www.gnu.org/licenses/>.
21 *
22 * The authors can be reached via e-mail to <support@deliantra.net>
23 */
24
25// note: the original code was released under the LGPL version 2.1
20 26
21#include <cstdio> 27#include <cstdio>
22#include <cstring> 28#include <cstring>
23#include <stdlib.h> 29#include <stdlib.h>
24#include <stdint.h> 30#include <stdint.h>
… …
48# define trY 0x30 54# define trY 0x30
49# define trU 0x11 55# define trU 0x11
50# define trV 0x10 56# define trV 0x10
51# define trA 0x40 57# define trA 0x40
52 58
59static int32_t
60udiff (uint32_t a, uint32_t b)
61{
62 return a > b ? a - b : b - a;
63
64}
65
53static inline pixel lerp (pixel c1, int w1, pixel c2, int w2, pixel c3, int w3, int shift) 66static inline pixel lerp (pixel c1, int w1, pixel c2, int w2, pixel c3, int w3, int shift)
54{ 67{
55#if 0 68#if 0
56 if (!(c1 >> Ashift) & Cmask) w1 = 0; 69 if (!(c1 >> Ashift) & Cmask) w1 = 0;
57 if (!(c2 >> Ashift) & Cmask) w2 = 0; 70 if (!(c2 >> Ashift) & Cmask) w2 = 0;
… …
61 int w = w1 + w2 + w3; 74 int w = w1 + w2 + w3;
62 75
63 return ((((c1 >> shift) & Cmask) * w1 + ((c2 >> shift) & Cmask) * w2 + ((c3 >> shift) & Cmask) * w3 + w / 2) / w) << shift; 76 return ((((c1 >> shift) & Cmask) * w1 + ((c2 >> shift) & Cmask) * w2 + ((c3 >> shift) & Cmask) * w3 + w / 2) / w) << shift;
64} 77}
65 78
66inline void lerp (unsigned char *pc, pixel c1, int w1, pixel c2, int w2, pixel c3 = 0, int w3 = 0) 79static inline void lerp (unsigned char *pc, pixel c1, int w1, pixel c2, int w2, pixel c3 = 0, int w3 = 0)
67{ 80{
68 *(pixel *)pc = lerp (c1, w1, c2, w2, c3, w3, Rshift) 81 *(pixel *)pc = lerp (c1, w1, c2, w2, c3, w3, Rshift)
69 | lerp (c1, w1, c2, w2, c3, w3, Gshift) 82 | lerp (c1, w1, c2, w2, c3, w3, Gshift)
70 | lerp (c1, w1, c2, w2, c3, w3, Bshift) 83 | lerp (c1, w1, c2, w2, c3, w3, Bshift)
71 | lerp (c1, w1, c2, w2, c3, w3, Ashift); 84 | lerp (c1, w1, c2, w2, c3, w3, Ashift);
72} 85}
73 86
74inline void Interp1 (unsigned char *pc, pixel c1, pixel c2) 87static inline void Interp1 (unsigned char *pc, pixel c1, pixel c2)
75{ 88{
76 lerp (pc, c1, 3, c2, 1); 89 lerp (pc, c1, 3, c2, 1);
77} 90}
78 91
79inline void Interp2 (unsigned char *pc, pixel c1, pixel c2, pixel c3) 92static inline void Interp2 (unsigned char *pc, pixel c1, pixel c2, pixel c3)
80{ 93{
81 lerp (pc, c1, 2, c2, 1, c3, 1); 94 lerp (pc, c1, 2, c2, 1, c3, 1);
82} 95}
83 96
84inline void Interp5 (unsigned char *pc, pixel c1, pixel c2) 97static inline void Interp5 (unsigned char *pc, pixel c1, pixel c2)
85{ 98{
86 lerp (pc, c1, 1, c2, 1); 99 lerp (pc, c1, 1, c2, 1);
87} 100}
88 101
89inline void Interp6 (unsigned char *pc, pixel c1, pixel c2, pixel c3) 102static inline void Interp6 (unsigned char *pc, pixel c1, pixel c2, pixel c3)
90{ 103{
91 lerp (pc, c1, 5, c2, 2, c3, 1); 104 lerp (pc, c1, 5, c2, 2, c3, 1);
92} 105}
93 106
94inline void Interp7 (unsigned char *pc, pixel c1, pixel c2, pixel c3) 107static inline void Interp7 (unsigned char *pc, pixel c1, pixel c2, pixel c3)
95{ 108{
96 lerp (pc, c1, 6, c2, 1, c3, 1); 109 lerp (pc, c1, 6, c2, 1, c3, 1);
97} 110}
98 111
99inline void Interp9 (unsigned char *pc, pixel c1, pixel c2, pixel c3) 112static inline void Interp9 (unsigned char *pc, pixel c1, pixel c2, pixel c3)
100{ 113{
101 lerp (pc, c1, 2, c2, 3, c2, 3); 114 lerp (pc, c1, 2, c2, 3, c2, 3);
102} 115}
103 116
104inline void Interp10 (unsigned char *pc, pixel c1, pixel c2, pixel c3) 117static inline void Interp10 (unsigned char *pc, pixel c1, pixel c2, pixel c3)
105{ 118{
106 lerp (pc, c1, 14, c2, 1, c3, 1); 119 lerp (pc, c1, 14, c2, 1, c3, 1);
107} 120}
108 121
109#define PIXEL00_0 *((pixel *)(pOut)) = w[5]; 122#define PIXEL00_0 *((pixel *)(pOut)) = w[5];
… …
153#define PIXEL11_61 Interp6(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]); 166#define PIXEL11_61 Interp6(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]);
154#define PIXEL11_70 Interp7(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]); 167#define PIXEL11_70 Interp7(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]);
155#define PIXEL11_90 Interp9(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]); 168#define PIXEL11_90 Interp9(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]);
156#define PIXEL11_100 Interp10(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]); 169#define PIXEL11_100 Interp10(pOut+BpL + sizeof (pixel), w[5], w[6], w[8]);
157 170
158inline pixel RGBAtoYUVA (pixel w) 171static inline pixel RGBAtoYUVA (pixel w)
159{ 172{
160 int r = (w >> Rshift) & Cmask; 173 int r = (w >> Rshift) & Cmask;
161 int g = (w >> Gshift) & Cmask; 174 int g = (w >> Gshift) & Cmask;
162 int b = (w >> Bshift) & Cmask; 175 int b = (w >> Bshift) & Cmask;
163 int a = (w >> Ashift) & Cmask; 176 int a = (w >> Ashift) & Cmask;
… …
170 | (u << Gshift) 183 | (u << Gshift)
171 | (v << Bshift) 184 | (v << Bshift)
172 | (a << Ashift); 185 | (a << Ashift);
173} 186}
174 187
175inline bool Diff (pixel w1, pixel w2) 188static inline bool Diff (pixel w1, pixel w2)
176{ 189{
177 pixel YUV1 = RGBAtoYUVA (w1); 190 pixel YUV1 = RGBAtoYUVA (w1);
178 pixel YUV2 = RGBAtoYUVA (w2); 191 pixel YUV2 = RGBAtoYUVA (w2);
179 192
180 return ((abs (((YUV1 >> Rshift) & Cmask) - ((YUV2 >> Rshift) & Cmask)) > trY) || 193 return ((udiff ((YUV1 >> Rshift) & Cmask, (YUV2 >> Rshift) & Cmask) > trY) ||
181 (abs (((YUV1 >> Gshift) & Cmask) - ((YUV2 >> Gshift) & Cmask)) > trU) || 194 (udiff ((YUV1 >> Gshift) & Cmask, (YUV2 >> Gshift) & Cmask) > trU) ||
182 (abs (((YUV1 >> Bshift) & Cmask) - ((YUV2 >> Bshift) & Cmask)) > trV) || 195 (udiff ((YUV1 >> Bshift) & Cmask, (YUV2 >> Bshift) & Cmask) > trV) ||
183 (abs (((YUV1 >> Ashift) & Cmask) - ((YUV2 >> Ashift) & Cmask)) > trA) ); 196 (udiff ((YUV1 >> Ashift) & Cmask, (YUV2 >> Ashift) & Cmask) > trA) );
184} 197}
185 198
186void 199static void
187hq2x_32 (unsigned char *pIn, unsigned char *pOut, int Xres, int Yres, int BpL, bool wrap) 200hq2x_32 (unsigned char *pIn, unsigned char *pOut, int Xres, int Yres, int BpL, bool wrap)
188{ 201{
189 int i, j, k; 202 int i, j, k;
190 int prevline, nextline; 203 int prevline, nextline;
191 pixel w[10]; 204 pixel w[10];
192 205
193 // +----+----+----+ 206 // +--+--+--+
194 // | | | |
195 // | w1 | w2 | w3 | 207 // |w1|w2|w3|
196 // +----+----+----+ 208 // +--+--+--+
197 // | | | |
198 // | w4 | w5 | w6 | 209 // |w4|w5|w6|
199 // +----+----+----+ 210 // +--+--+--+
200 // | | | |
201 // | w7 | w8 | w9 | 211 // |w7|w8|w9|
202 // +----+----+----+ 212 // +--+--+--+
203 213
204 for (j = 0; j < Yres; j++) 214 for (j = 0; j < Yres; j++)
205 { 215 {
206 if (j > 0) 216 if (j > 0)
207 prevline = -Xres * sizeof (pixel); 217 prevline = -Xres * sizeof (pixel);

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