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comparison mupdf-source/thirdparty/lcms2/plugins/threaded/src/threaded_scheduler.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 //---------------------------------------------------------------------------------
2 //
3 // Little Color Management System, multithreaded extensions
4 // Copyright (c) 1998-2023 Marti Maria Saguer, all rights reserved
5 //
6 //
7 // This program is free software: you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation, either version 3 of the License, or
10 // (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program. If not, see <http://www.gnu.org/licenses/>.
19 //
20 //---------------------------------------------------------------------------------
21
22 #include "threaded_internal.h"
23
24 // The scheduler is responsible to split the work in several portions in a way that each
25 // portion can be calculated by a different thread. All locking is already done by lcms
26 // mutexes, memory should not overlap.
27 void _cmsThrScheduler(struct _cmstransform_struct* CMMcargo,
28 const void* InputBuffer,
29 void* OutputBuffer,
30 cmsUInt32Number PixelsPerLine,
31 cmsUInt32Number LineCount,
32 const cmsStride* Stride)
33 {
34 cmsContext ContextID = cmsGetTransformContextID(CMMcargo);
35 _cmsTransform2Fn worker = _cmsGetTransformWorker(CMMcargo);
36 cmsInt32Number MaxWorkers = _cmsGetTransformMaxWorkers(CMMcargo);
37
38 // flags are not actually being used
39 // cmsUInt32Number flags = _cmsGetTransformWorkerFlags(CMMcargo);
40
41 _cmsWorkSlice master;
42 _cmsWorkSlice* slices;
43 cmsStride FixedStride = *Stride;
44 cmsHANDLE* handles;
45
46 // Count the number of threads needed for this job. MaxWorkers is the upper limit or -1 to auto
47 cmsUInt32Number nSlices = _cmsThrCountSlices(CMMcargo, MaxWorkers, PixelsPerLine, LineCount, &FixedStride);
48
49 // Abort early if no threaded code
50 if (nSlices <= 1) {
51
52 worker(CMMcargo, InputBuffer, OutputBuffer, PixelsPerLine, LineCount, Stride);
53 return;
54 }
55
56 // Setup master thread
57 master.CMMcargo = CMMcargo;
58 master.InputBuffer = InputBuffer;
59 master.OutputBuffer = OutputBuffer;
60 master.PixelsPerLine = PixelsPerLine;
61 master.LineCount = LineCount;
62 master.Stride = &FixedStride;
63
64 // Create memory for the slices
65 slices = (_cmsWorkSlice*)_cmsCalloc(ContextID, nSlices, sizeof(_cmsWorkSlice));
66 handles = (cmsHANDLE*) _cmsCalloc(ContextID, nSlices, sizeof(cmsHANDLE));
67
68 if (slices == NULL || handles == NULL)
69 {
70 if (slices) _cmsFree(ContextID, slices);
71 if (handles) _cmsFree(ContextID, handles);
72
73 // Out of memory in this case only can come from a corruption, but we do the work anyway
74 worker(CMMcargo, InputBuffer, OutputBuffer, PixelsPerLine, LineCount, Stride);
75 return;
76 }
77
78 // All seems ok so far
79 if (_cmsThrSplitWork(&master, nSlices, slices))
80 {
81 // Work is splitted. Create threads
82 cmsUInt32Number i;
83
84 for (i = 1; i < nSlices; i++)
85 {
86 handles[i] = _cmsThrCreateWorker(ContextID, worker, &slices[i]);
87 }
88
89 // Do our portion of work
90 worker(CMMcargo, slices[0].InputBuffer, slices[0].OutputBuffer,
91 slices[0].PixelsPerLine, slices[0].LineCount, slices[0].Stride);
92
93 // Wait until all threads are finished
94 for (i = 1; i < nSlices; i++)
95 {
96 _cmsThrJoinWorker(ContextID, handles[i]);
97 }
98 }
99 else
100 {
101 // Not able to split the work, so don't thread
102 worker(CMMcargo, InputBuffer, OutputBuffer, PixelsPerLine, LineCount, Stride);
103 }
104
105 _cmsFree(ContextID, slices);
106 _cmsFree(ContextID, handles);
107 }
108