86b89cf62a
Add gimp-parallel.[cc,h], which provides a set of parallel
algorithms.
These currently include:
- gimp_parallel_distribute(): Calls a callback function in
parallel on multiple threads, passing it the current thread
index, and the total number of threads. Allows specifying the
maximal number of threads used.
- gimp_parallel_distribute_range(): Splits a range of integers
between multiple threads, passing the sub-range to a callback
function. Allows specifying the minimal sub-range size.
- gimp_parallel_distribute_area(): Splits a rectangular area
between multiple threads, passing the sub-area to a callback
function. Allows specifying the minimal sub-area.
The callback function is passed using an appropriately-typed
function pointer, and a user-data pointer. Additionally, when used
in a C++ file, each of the above functions has an overloaded
template version, taking the callback through a generic parameter,
without a user-data pointer, which allows using function objects.
113 lines
4.7 KiB
C++
113 lines
4.7 KiB
C++
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimp-parallel.h
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* Copyright (C) 2018 Ell
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GIMP_PARALLEL_H__
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#define __GIMP_PARALLEL_H__
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typedef void (* GimpParallelDistributeFunc) (gint i,
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gint n,
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gpointer user_data);
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typedef void (* GimpParallelDistributeRangeFunc) (gsize offset,
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gsize size,
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gpointer user_data);
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typedef void (* GimpParallelDistributeAreaFunc) (const GeglRectangle *area,
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gpointer user_data);
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void gimp_parallel_init (Gimp *gimp);
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void gimp_parallel_exit (Gimp *gimp);
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void gimp_parallel_distribute (gint max_n,
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GimpParallelDistributeFunc func,
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gpointer user_data);
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void gimp_parallel_distribute_range (gsize size,
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gsize min_sub_size,
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GimpParallelDistributeRangeFunc func,
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gpointer user_data);
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void gimp_parallel_distribute_area (const GeglRectangle *area,
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gsize min_sub_area,
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GimpParallelDistributeAreaFunc func,
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gpointer user_data);
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#ifdef __cplusplus
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extern "C++"
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{
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template <class ParallelDistributeFunc>
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inline void
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gimp_parallel_distribute (gint max_n,
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ParallelDistributeFunc func)
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{
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gimp_parallel_distribute (max_n,
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[] (gint i,
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gint n,
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gpointer user_data)
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{
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ParallelDistributeFunc func_copy (
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*(const ParallelDistributeFunc *) user_data);
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func_copy (i, n);
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}, &func);
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}
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template <class ParallelDistributeRangeFunc>
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inline void
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gimp_parallel_distribute_range (gsize size,
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gsize min_sub_size,
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ParallelDistributeRangeFunc func)
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{
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gimp_parallel_distribute_range (size, min_sub_size,
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[] (gsize offset,
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gsize size,
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gpointer user_data)
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{
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ParallelDistributeRangeFunc func_copy (
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*(const ParallelDistributeRangeFunc *) user_data);
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func_copy (offset, size);
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}, &func);
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}
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template <class ParallelDistributeAreaFunc>
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inline void
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gimp_parallel_distribute_area (const GeglRectangle *area,
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gsize min_sub_area,
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ParallelDistributeAreaFunc func)
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{
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gimp_parallel_distribute_area (area, min_sub_area,
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[] (const GeglRectangle *area,
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gpointer user_data)
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{
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ParallelDistributeAreaFunc func_copy (
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*(const ParallelDistributeAreaFunc *) user_data);
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func_copy (area);
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}, &func);
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}
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}
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#endif /* __cplusplus */
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#endif /* __GIMP_PARALLEL_H__ */
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