LIBJXL

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parallel_runner.h
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1/* Copyright (c) the JPEG XL Project Authors. All rights reserved.
2 *
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
5 */
6
37#ifndef JXL_PARALLEL_RUNNER_H_
38#define JXL_PARALLEL_RUNNER_H_
39
40#include <stddef.h>
41#include <stdint.h>
42
43#ifdef __cplusplus
44 extern "C" {
45#endif
46
52 typedef int JxlParallelRetCode;
53
57#define JXL_PARALLEL_RET_SUCCESS (0)
58
63#define JXL_PARALLEL_RET_RUNNER_ERROR (-1)
64
83 typedef JxlParallelRetCode (*JxlParallelRunInit)(void* jpegxl_opaque,
84 size_t num_threads);
85
102 typedef void (*JxlParallelRunFunction)(void* jpegxl_opaque, uint32_t value,
103 size_t thread_id);
104
127 typedef JxlParallelRetCode (*JxlParallelRunner)(
128 void* runner_opaque, void* jpegxl_opaque, JxlParallelRunInit init,
129 JxlParallelRunFunction func, uint32_t start_range, uint32_t end_range);
130
131/* The following is an example of a @ref JxlParallelRunner that doesn't use any
132 * multi-threading. Note that this implementation doesn't store any state
133 * between multiple calls of the ExampleSequentialRunner function, so the
134 * runner_opaque value is not used.
135
136 JxlParallelRetCode ExampleSequentialRunner(void* runner_opaque,
137 void* jpegxl_opaque,
138 JxlParallelRunInit init,
139 JxlParallelRunFunction func,
140 uint32_t start_range,
141 uint32_t end_range) {
142 // We only use one thread (the currently running thread).
143 JxlParallelRetCode init_ret = (*init)(jpegxl_opaque, 1);
144 if (init_ret != 0) return init_ret;
145
146 // In case of other initialization error (for example when initializing the
147 // threads) one can return JXL_PARALLEL_RET_RUNNER_ERROR.
148
149 for (uint32_t i = start_range; i < end_range; i++) {
150 // Every call is in the thread number 0. These don't need to be in any
151 // order.
152 (*func)(jpegxl_opaque, i, 0);
153 }
154 return JXL_PARALLEL_RET_SUCCESS;
155 }
156 */
157
158#ifdef __cplusplus
159}
160#endif
161
162#endif /* JXL_PARALLEL_RUNNER_H_ */
163
JxlParallelRunner
JxlParallelRetCode(* JxlParallelRunner)(void *runner_opaque, void *jpegxl_opaque, JxlParallelRunInit init, JxlParallelRunFunction func, uint32_t start_range, uint32_t end_range)
Definition parallel_runner.h:127
JxlParallelRunInit
JxlParallelRetCode(* JxlParallelRunInit)(void *jpegxl_opaque, size_t num_threads)
Definition parallel_runner.h:83
JxlParallelRetCode
int JxlParallelRetCode
Definition parallel_runner.h:52
JxlParallelRunFunction
void(* JxlParallelRunFunction)(void *jpegxl_opaque, uint32_t value, size_t thread_id)
Definition parallel_runner.h:102