GFXprim
2D bitmap graphics library with emphasis on speed and correctness
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gp_get_set_bits.h
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1// SPDX-License-Identifier: LGPL-2.1-or-later
2/*
3 * Copyright (C) 2011 Tomas Gavenciak <gavento@ucw.cz>
4 * Copyright (C) 2011-2024 Cyril Hrubis <metan@ucw.cz>
5 */
6
22#ifndef CORE_GP_GET_SET_BITS_H
23#define CORE_GP_GET_SET_BITS_H
24
34#define GP_GET_BITS(offset, len, val) \
35 (sizeof(val) * 8 <= len ? \
36 (val)>>(offset) : \
37 ((val)>>(offset)) & (((((typeof(val))1)<<(len)) - 1)))
38
48#define GP_GET_BITS4_ALIGNED(offset, len, buf) ({ \
49 uint32_t v; \
50 v = ((uint8_t *)buf)[0]; \
51 v |= ((uint8_t *)buf)[1]<<8; \
52 v |= ((uint8_t *)buf)[2]<<16; \
53 v |= ((uint8_t *)buf)[3]<<24; \
54 \
55 GP_GET_BITS(offset, len, v); \
56})
57
67#define GP_GET_BITS3_ALIGNED(offset, len, buf) ({ \
68 uint32_t v; \
69 v = ((uint8_t *)buf)[0]; \
70 v |= ((uint8_t *)buf)[1]<<8; \
71 v |= ((uint8_t *)buf)[2]<<16; \
72 \
73 GP_GET_BITS(offset, len, v); \
74})
75
85#define GP_GET_BITS2_ALIGNED(offset, len, buf) ({ \
86 uint16_t v; \
87 v = ((uint8_t *)buf)[0]; \
88 v |= ((uint8_t *)buf)[1]<<8; \
89 \
90 GP_GET_BITS(offset, len, v); \
91})
92
102#define GP_GET_BITS1_ALIGNED(offset, len, buf) ({ \
103 uint8_t v; \
104 v = ((uint8_t *)buf)[0]; \
105 \
106 GP_GET_BITS(offset, len, v); \
107})
108
119#define GP_CLEAR_BITS(offset, len, dest) \
120 ((dest) &= ~(((((typeof(dest))1) << (len)) - 1) << (offset)))
121
133#define GP_SET_BITS(offset, len, dest, val) do { \
134 GP_CLEAR_BITS(offset, len, dest); \
135 ((dest) |= ((val)<<(offset))); \
136} while (0)
137
149#define GP_SET_BITS1_ALIGNED(offset, len, dest, val) do { \
150 uint8_t v = ((uint8_t *)dest)[0]; \
151 GP_SET_BITS(offset, len, v, val); \
152 ((uint8_t *)dest)[0] = v; \
153} while (0)
154
166#define GP_SET_BITS2_ALIGNED(offset, len, dest, val) do { \
167 uint16_t v; \
168 v = ((uint8_t *)dest)[0]; \
169 v |= ((uint8_t *)dest)[1]<<8; \
170 \
171 GP_SET_BITS(offset, len, v, val); \
172 \
173 ((uint8_t *)dest)[0] = 0xff & v; \
174 ((uint8_t *)dest)[1] = 0xff & (v >> 8); \
175} while (0)
176
188#define GP_SET_BITS3_ALIGNED(offset, len, dest, val) do { \
189 uint32_t v; \
190 v = ((uint8_t *)dest)[0]; \
191 v |= ((uint8_t *)dest)[1]<<8; \
192 v |= ((uint8_t *)dest)[2]<<16; \
193 \
194 GP_SET_BITS(offset, len, v, val); \
195 \
196 ((uint8_t *)dest)[0] = 0xff & v; \
197 ((uint8_t *)dest)[1] = 0xff & (v >> 8); \
198 ((uint8_t *)dest)[2] = 0xff & (v >> 16); \
199} while (0)
200
212#define GP_SET_BITS4_ALIGNED(offset, len, dest, val) do { \
213 uint32_t v; \
214 v = ((uint8_t *)dest)[0]; \
215 v |= ((uint8_t *)dest)[2]<<16; \
216 v |= ((uint8_t *)dest)[3]<<24; \
217 \
218 GP_SET_BITS(offset, len, v, val); \
219 \
220 ((uint8_t *)dest)[0] = 0xff & v; \
221 ((uint8_t *)dest)[1] = 0xff & (v >> 8); \
222 ((uint8_t *)dest)[2] = 0xff & (v >> 16); \
223 ((uint8_t *)dest)[3] = 0xff & (v >> 24); \
224} while (0)
225
226
227#endif /* CORE_GP_GET_SET_BITS_H */
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