dnrops
/
gimp
mirror of https://github.com/GNOME/gimp.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
gimp/app/base/pixel-processor.c

362 lines
9.4 KiB
C
Raw Blame History

/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pixel_processor.c: Copyright (C) 1999 Jay Cox <jaycox@earthlink.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#ifdef ENABLE_MP
#include <string.h>
#endif
#include <glib-object.h>
#include "base-types.h"
#include "config/gimpbaseconfig.h"
#include "pixel-processor.h"
#include "pixel-region.h"
#ifdef ENABLE_MP
#include "tile.h"
#endif
static gint num_threads = 0;
typedef void (* p1_func) (gpointer data,
PixelRegion *region1);
typedef void (* p2_func) (gpointer data,
PixelRegion *region1,
PixelRegion *region2);
typedef void (* p3_func) (gpointer data,
PixelRegion *region1,
PixelRegion *region2,
PixelRegion *region3);
typedef void (* p4_func) (gpointer data,
PixelRegion *region1,
PixelRegion *region2,
PixelRegion *region3,
PixelRegion *region4);
typedef struct _PixelProcessor PixelProcessor;
struct _PixelProcessor
{
gpointer data;
PixelProcessorFunc func;
PixelRegionIterator *PRI;
#ifdef ENABLE_MP
GMutex *mutex;
gint num_threads;
#endif
gint num_regions;
PixelRegion *regions[4];
};
#ifdef ENABLE_MP
static void
do_parallel_regions (PixelProcessor *processor)
{
PixelRegion tr[4];
gint n_tiles = 0;
gint i;
g_mutex_lock (processor->mutex);
if (processor->num_threads != 0 && processor->PRI)
processor->PRI = pixel_regions_process (processor->PRI);
if (processor->PRI == NULL)
{
g_mutex_unlock (processor->mutex);
return;
}
processor->num_threads++;
do
{
for (i = 0; i < processor->num_regions; i++)
if (processor->regions[i])
{
memcpy (&tr[i], processor->regions[i], sizeof (PixelRegion));
if (tr[i].tiles)
tile_lock (tr[i].curtile);
}
g_mutex_unlock (processor->mutex);
n_tiles++;
switch(processor->num_regions)
{
case 1:
((p1_func) processor->func) (processor->data,
processor->regions[0] ? &tr[0] : NULL);
break;
case 2:
((p2_func) processor->func) (processor->data,
processor->regions[0] ? &tr[0] : NULL,
processor->regions[1] ? &tr[1] : NULL);
break;
case 3:
((p3_func) processor->func) (processor->data,
processor->regions[0] ? &tr[0] : NULL,
processor->regions[1] ? &tr[1] : NULL,
processor->regions[2] ? &tr[2] : NULL);
break;
case 4:
((p4_func) processor->func) (processor->data,
processor->regions[0] ? &tr[0] : NULL,
processor->regions[1] ? &tr[1] : NULL,
processor->regions[2] ? &tr[2] : NULL,
processor->regions[3] ? &tr[3] : NULL);
break;
default:
g_warning ("do_parallel_regions: Bad number of regions %d\n",
processor->num_regions);
break;
}
g_mutex_lock (processor->mutex);
for (i = 0; i < processor->num_regions; i++)
if (processor->regions[i])
{
if (tr[i].tiles)
tile_release (tr[i].curtile, tr[i].dirty);
}
}
while (processor->PRI &&
(processor->PRI = pixel_regions_process (processor->PRI)));
processor->num_threads--;
g_mutex_unlock (processor->mutex);
}
#endif
/* do_parallel_regions_single is just like do_parallel_regions
* except that all the mutex and tile locks have been removed
*
* If we are processing with only a single thread we don't need to do
* the mutex locks etc. and aditional tile locks even if we were
* configured --with-mp
*/
static gpointer
do_parallel_regions_single (PixelProcessor *processor)
{
do
{
switch (processor->num_regions)
{
case 1:
((p1_func) processor->func) (processor->data,
processor->regions[0]);
break;
case 2:
((p2_func) processor->func) (processor->data,
processor->regions[0],
processor->regions[1]);
break;
case 3:
((p3_func) processor->func) (processor->data,
processor->regions[0],
processor->regions[1],
processor->regions[2]);
break;
case 4:
((p4_func) processor->func) (processor->data,
processor->regions[0],
processor->regions[1],
processor->regions[2],
processor->regions[3]);
break;
default:
g_warning ("do_parallel_regions_single: Bad number of regions %d\n",
processor->num_regions);
}
}
while (processor->PRI &&
(processor->PRI = pixel_regions_process (processor->PRI)));
return NULL;
}
#define MAX_THREADS 16
static void
pixel_regions_do_parallel (PixelProcessor *processor)
{
#ifdef ENABLE_MP
gint nthreads = MIN (num_threads, MAX_THREADS);
/* make sure we have at least one tile per thread */
nthreads = MIN (nthreads,
(processor->PRI->region_width *
processor->PRI->region_height) / (TILE_WIDTH * TILE_HEIGHT));
if (nthreads > 1)
{
GThread *threads[MAX_THREADS];
gint i;
for (i = 0; i < nthreads; i++)
{
GError *error = NULL;
threads[i] = g_thread_create ((GThreadFunc) do_parallel_regions,
processor,
TRUE, &error);
if (! threads[i])
{
g_warning ("cannot create thread: %s\n", error->message);
g_clear_error (&error);
}
}
for (i = 0; i < nthreads; i++)
{
g_thread_join (threads[i]);
}
if (processor->num_threads != 0)
g_printerr ("pixel_regions_do_prarallel: we lost a thread\n");
}
else
#endif
{
do_parallel_regions_single (processor);
}
}
static void
pixel_regions_process_parallel_valist (PixelProcessorFunc func,
gpointer data,
gint num_regions,
va_list ap)
{
PixelProcessor processor = { NULL, };
gint i;
for (i = 0; i < num_regions; i++)
processor.regions[i] = va_arg (ap, PixelRegion *);
switch(num_regions)
{
case 1:
processor.PRI = pixel_regions_register (num_regions,
processor.regions[0]);
break;
case 2:
processor.PRI = pixel_regions_register (num_regions,
processor.regions[0],
processor.regions[1]);
break;
case 3:
processor.PRI = pixel_regions_register (num_regions,
processor.regions[0],
processor.regions[1],
processor.regions[2]);
break;
case 4:
processor.PRI = pixel_regions_register (num_regions,
processor.regions[0],
processor.regions[1],
processor.regions[2],
processor.regions[3]);
break;
default:
g_warning ("pixel_regions_process_parallel:"
"Bad number of regions %d\n", processor.num_regions);
}
if (! processor.PRI)
{
return;
}
processor.func = func;
processor.data = data;
processor.num_regions = num_regions;
#ifdef ENABLE_MP
processor.mutex = g_mutex_new ();
processor.num_threads = 0;
#endif
pixel_regions_do_parallel (&processor);
#ifdef ENABLE_MP
g_mutex_free (processor.mutex);
#endif
}
void
pixel_processor_init (gint num_threads)
{
num_threads = MAX (num_threads, MAX_THREADS);
}
void
pixel_processor_set_num_threads (gint num_threads)
{
num_threads = MAX (num_threads, MAX_THREADS);
}
void
pixel_processor_exit (void)
{
num_threads = 0;
}
void
pixel_regions_process_parallel (PixelProcessorFunc func,
gpointer data,
gint num_regions,
...)
{
va_list va;
va_start (va, num_regions);
pixel_regions_process_parallel_valist (func, data, num_regions, va);
va_end (va);
}
Reference in New Issue View Git Blame Copy Permalink