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gimp/app/base/pixel-processor.c

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/* 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 <pthread.h>
#define IF_THREAD(statement) statement
#else /* !ENABLE_MP */
#define IF_THREAD(statement)
#endif /* ENABLE_MP */
#include <glib-object.h>
#include "base-types.h"
#include "base-config.h"
#include "pixel-processor.h"
#include "pixel-region.h"
#ifdef ENABLE_MP
#include "tile.h"
#endif
typedef void (* p1_func) (gpointer ,
PixelRegion *);
typedef void (* p2_func) (gpointer ,
PixelRegion * ,
PixelRegion *);
typedef void (* p3_func) (gpointer ,
PixelRegion *,
PixelRegion *,
PixelRegion *);
typedef void (* p4_func) (gpointer ,
PixelRegion *,
PixelRegion *,
PixelRegion *,
PixelRegion *);
struct _PixelProcessor
{
gpointer data;
p_func f;
PixelRegionIterator *PRI;
IF_THREAD(pthread_mutex_t mutex;)
gint nthreads;
gint n_regions;
PixelRegion *r[4];
void *progress_report_data;
ProgressReportFunc progress_report_func;
};
IF_THREAD(
static void *
do_parallel_regions (PixelProcessor *p_s)
{
PixelRegion tr[4];
gint n_tiles = 0;
gint i;
gint cont = 1;
pthread_mutex_lock (&p_s->mutex);
if (p_s->nthreads != 0 && p_s->PRI)
p_s->PRI = (PixelRegionIterator*)pixel_regions_process(p_s->PRI);
if (p_s->PRI == NULL)
{
pthread_mutex_unlock (&p_s->mutex);
return NULL;
}
p_s->nthreads++;
do
{
for (i = 0; i < p_s->n_regions; i++)
if (p_s->r[i])
{
memcpy(&tr[i], p_s->r[i], sizeof(PixelRegion));
if (tr[i].tiles)
tile_lock(tr[i].curtile);
}
pthread_mutex_unlock (&p_s->mutex);
n_tiles++;
switch(p_s->n_regions)
{
case 1:
((p1_func)p_s->f)(p_s->data,
p_s->r[0] ? &tr[0] : NULL);
break;
case 2:
((p2_func)p_s->f)(p_s->data,
p_s->r[0] ? &tr[0] : NULL,
p_s->r[1] ? &tr[1] : NULL);
break;
case 3:
((p3_func)p_s->f)(p_s->data,
p_s->r[0] ? &tr[0] : NULL,
p_s->r[1] ? &tr[1] : NULL,
p_s->r[2] ? &tr[2] : NULL);
break;
case 4:
((p4_func)p_s->f)(p_s->data,
p_s->r[0] ? &tr[0] : NULL,
p_s->r[1] ? &tr[1] : NULL,
p_s->r[2] ? &tr[2] : NULL,
p_s->r[3] ? &tr[3] : NULL);
break;
default:
g_message("do_parallel_regions: Bad number of regions %d\n",
p_s->n_regions);
}
pthread_mutex_lock (&p_s->mutex);
for (i = 0; i < p_s->n_regions; i++)
if (p_s->r[i])
{
if (tr[i].tiles)
tile_release(tr[i].curtile, tr[i].dirty);
}
if (p_s->progress_report_func &&
!p_s->progress_report_func(p_s->progress_report_data,
p_s->r[0]->x, p_s->r[0]->y,
p_s->r[0]->w, p_s->r[0]->h))
cont = 0;
}
while (cont && p_s->PRI &&
(p_s->PRI = (PixelRegionIterator*)pixel_regions_process(p_s->PRI)));
p_s->nthreads--;
pthread_mutex_unlock (&p_s->mutex);
return NULL;
}
)
/* 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 *p_s)
{
gint cont = 1;
do
{
switch (p_s->n_regions)
{
case 1:
((p1_func)p_s->f)(p_s->data,
p_s->r[0]);
break;
case 2:
((p2_func)p_s->f)(p_s->data,
p_s->r[0],
p_s->r[1]);
break;
case 3:
((p3_func)p_s->f)(p_s->data,
p_s->r[0],
p_s->r[1],
p_s->r[2]);
break;
case 4:
((p4_func)p_s->f)(p_s->data,
p_s->r[0],
p_s->r[1],
p_s->r[2],
p_s->r[3]);
break;
default:
g_message("do_parallel_regions_single: Bad number of regions %d\n",
p_s->n_regions);
}
if (p_s->progress_report_func)
if (!p_s->progress_report_func (p_s->progress_report_data,
p_s->r[0]->x, p_s->r[0]->y,
p_s->r[0]->w, p_s->r[0]->h))
cont = 0;
}
while (cont && p_s->PRI &&
(p_s->PRI = (PixelRegionIterator*)pixel_regions_process(p_s->PRI)));
return NULL;
}
#define MAX_THREADS 30
static void
pixel_regions_do_parallel (PixelProcessor *p_s)
{
IF_THREAD(
gint nthreads;
nthreads = MIN (base_config->num_processors, MAX_THREADS);
/* make sure we have at least one tile per thread */
nthreads = MIN (nthreads,
(p_s->PRI->region_width * p_s->PRI->region_height)
/ (TILE_WIDTH * TILE_HEIGHT));
if (nthreads > 1)
{
gint i;
pthread_t threads[MAX_THREADS];
pthread_attr_t pthread_attr;
pthread_attr_init (&pthread_attr);
for (i = 0; i < nthreads; i++)
{
pthread_create (&threads[i], &pthread_attr,
(void *(*)(void *)) do_parallel_regions,
p_s);
}
for (i = 0; i < nthreads; i++)
{
gint ret;
if ((ret = pthread_join(threads[i], NULL)))
{
g_printerr ("pixel_regions_do_parallel:: pthread_join returned: %d\n", ret);
}
}
if (p_s->nthreads != 0)
g_printerr ("pixel_regions_do_prarallel: we lost a thread\n");
}
else
)
do_parallel_regions_single (p_s);
}
static PixelProcessor *
pixel_regions_real_process_parallel (p_func f,
gpointer data,
ProgressReportFunc report_func,
gpointer report_data,
gint num_regions,
va_list ap)
{
gint i;
PixelProcessor *p_s;
p_s = g_new (PixelProcessor, 1);
for (i = 0; i < num_regions; i++)
p_s->r[i] = va_arg (ap, PixelRegion *);
switch(num_regions)
{
case 1:
p_s->PRI = (PixelRegionIterator *) pixel_regions_register (num_regions,
p_s->r[0]);
break;
case 2:
p_s->PRI = (PixelRegionIterator *) pixel_regions_register (num_regions,
p_s->r[0],
p_s->r[1]);
break;
case 3:
p_s->PRI = (PixelRegionIterator *) pixel_regions_register (num_regions,
p_s->r[0],
p_s->r[1],
p_s->r[2]);
break;
case 4:
p_s->PRI = (PixelRegionIterator *) pixel_regions_register (num_regions,
p_s->r[0],
p_s->r[1],
p_s->r[2],
p_s->r[3]);
break;
default:
g_message ("pixel_regions_real_process_parallel: Bad number of regions %d\n",
p_s->n_regions);
}
if (!p_s->PRI)
{
pixel_processor_free (p_s);
return NULL;
}
/* Why would we wan't to set dirty_tiles to 0 here? */
/* IF_THREAD(p_s->PRI->dirty_tiles = 0;) */
p_s->f = f;
p_s->data = data;
p_s->n_regions = num_regions;
IF_THREAD (pthread_mutex_init(&(p_s->mutex), NULL);)
p_s->nthreads = 0;
p_s->progress_report_data = report_data;
p_s->progress_report_func = report_func;
pixel_regions_do_parallel (p_s);
if (p_s->PRI)
return p_s;
pixel_processor_free (p_s);
return NULL;
}
void
pixel_regions_process_parallel (p_func f,
gpointer data,
gint num_regions,
...)
{
va_list va;
va_start (va, num_regions);
pixel_regions_real_process_parallel (f, data, NULL, NULL, num_regions, va);
va_end (va);
}
PixelProcessor *
pixel_regions_process_parallel_progress (p_func f,
gpointer data,
ProgressReportFunc progress_func,
gpointer progress_data,
gint num_regions,
...)
{
PixelProcessor *ret;
va_list va;
va_start (va, num_regions);
ret = pixel_regions_real_process_parallel (f, data,
progress_func, progress_data,
num_regions, va);
va_end (va);
return ret;
}
void
pixel_processor_stop (PixelProcessor *pp)
{
if (!pp)
return;
if (pp->PRI)
{
pixel_regions_process_stop (pp->PRI);
pp->PRI = NULL;
}
pixel_processor_free (pp);
}
PixelProcessor *
pixel_processor_cont (PixelProcessor *pp)
{
pixel_regions_do_parallel (pp);
if (pp->PRI)
return pp;
pixel_processor_free (pp);
return NULL;
}
void
pixel_processor_free (PixelProcessor *pp)
{
if (pp->PRI)
pixel_processor_stop (pp);
else
g_free(pp);
}
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