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PIKApp/app/core/pikahistogram.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimphistogram module Copyright (C) 1999 Jay Cox <jaycox@gimp.org>
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "libpikacolor/pikacolor.h"
#include "core-types.h"
#include "gegl/pika-babl.h"
#include "gegl/pika-gegl-loops.h"
#include "pika-atomic.h"
#include "pika-parallel.h"
#include "pikaasync.h"
#include "pikahistogram.h"
#include "pikawaitable.h"
#define MAX_N_COMPONENTS 4
#define N_DERIVED_CHANNELS 2
#define PIXELS_PER_THREAD \
(/* each thread costs as much as */ 64.0 * 64.0 /* pixels */)
enum
{
PROP_0,
PROP_N_COMPONENTS,
PROP_N_BINS,
PROP_VALUES
};
struct _PikaHistogramPrivate
{
PikaTRCType trc;
gint n_channels;
gint n_bins;
gdouble *values;
PikaAsync *calculate_async;
};
typedef struct
{
/* input */
PikaHistogram *histogram;
GeglBuffer *buffer;
GeglRectangle buffer_rect;
GeglBuffer *mask;
GeglRectangle mask_rect;
/* output */
gint n_components;
gint n_bins;
gdouble *values;
} CalculateContext;
typedef struct
{
PikaAsync *async;
CalculateContext *context;
const Babl *format;
GSList *values_list;
} CalculateData;
/* local function prototypes */
static void pika_histogram_finalize (GObject *object);
static void pika_histogram_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_histogram_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gint64 pika_histogram_get_memsize (PikaObject *object,
gint64 *gui_size);
static gboolean pika_histogram_map_channel (PikaHistogram *histogram,
PikaHistogramChannel *channel);
static void pika_histogram_set_values (PikaHistogram *histogram,
gint n_components,
gint n_bins,
gdouble *values);
static void pika_histogram_calculate_internal (PikaAsync *async,
CalculateContext *context);
static void pika_histogram_calculate_area (const GeglRectangle *area,
CalculateData *data);
static void pika_histogram_calculate_async_callback (PikaAsync *async,
CalculateContext *context);
G_DEFINE_TYPE_WITH_PRIVATE (PikaHistogram, pika_histogram, PIKA_TYPE_OBJECT)
#define parent_class pika_histogram_parent_class
static void
pika_histogram_class_init (PikaHistogramClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaObjectClass *pika_object_class = PIKA_OBJECT_CLASS (klass);
object_class->finalize = pika_histogram_finalize;
object_class->set_property = pika_histogram_set_property;
object_class->get_property = pika_histogram_get_property;
pika_object_class->get_memsize = pika_histogram_get_memsize;
g_object_class_install_property (object_class, PROP_N_COMPONENTS,
g_param_spec_int ("n-components", NULL, NULL,
0, MAX_N_COMPONENTS, 0,
PIKA_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_N_BINS,
g_param_spec_int ("n-bins", NULL, NULL,
256, 1024, 1024,
PIKA_PARAM_READABLE));
/* this is just for notifications */
g_object_class_install_property (object_class, PROP_VALUES,
g_param_spec_boolean ("values", NULL, NULL,
FALSE,
G_PARAM_READABLE));
}
static void
pika_histogram_init (PikaHistogram *histogram)
{
histogram->priv = pika_histogram_get_instance_private (histogram);
}
static void
pika_histogram_finalize (GObject *object)
{
PikaHistogram *histogram = PIKA_HISTOGRAM (object);
pika_histogram_clear_values (histogram, 0);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_histogram_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_histogram_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaHistogram *histogram = PIKA_HISTOGRAM (object);
switch (property_id)
{
case PROP_N_COMPONENTS:
g_value_set_int (value, pika_histogram_n_components (histogram));
break;
case PROP_N_BINS:
g_value_set_int (value, histogram->priv->n_bins);
break;
case PROP_VALUES:
/* return a silly boolean */
g_value_set_boolean (value, histogram->priv->values != NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gint64
pika_histogram_get_memsize (PikaObject *object,
gint64 *gui_size)
{
PikaHistogram *histogram = PIKA_HISTOGRAM (object);
gint64 memsize = 0;
if (histogram->priv->values)
memsize += (histogram->priv->n_channels *
histogram->priv->n_bins * sizeof (gdouble));
return memsize + PIKA_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
/* public functions */
PikaHistogram *
pika_histogram_new (PikaTRCType trc)
{
PikaHistogram *histogram = g_object_new (PIKA_TYPE_HISTOGRAM, NULL);
histogram->priv->trc = trc;
return histogram;
}
/**
* pika_histogram_duplicate:
* @histogram: a %PikaHistogram
*
* Creates a duplicate of @histogram. The duplicate has a reference
* count of 1 and contains the values from @histogram.
*
* Returns: a newly allocated %PikaHistogram
**/
PikaHistogram *
pika_histogram_duplicate (PikaHistogram *histogram)
{
PikaHistogram *dup;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), NULL);
if (histogram->priv->calculate_async)
pika_waitable_wait (PIKA_WAITABLE (histogram->priv->calculate_async));
dup = pika_histogram_new (histogram->priv->trc);
dup->priv->n_channels = histogram->priv->n_channels;
dup->priv->n_bins = histogram->priv->n_bins;
dup->priv->values = g_memdup2 (histogram->priv->values,
sizeof (gdouble) *
dup->priv->n_channels *
dup->priv->n_bins);
return dup;
}
void
pika_histogram_calculate (PikaHistogram *histogram,
GeglBuffer *buffer,
const GeglRectangle *buffer_rect,
GeglBuffer *mask,
const GeglRectangle *mask_rect)
{
CalculateContext context = {};
g_return_if_fail (PIKA_IS_HISTOGRAM (histogram));
g_return_if_fail (GEGL_IS_BUFFER (buffer));
g_return_if_fail (buffer_rect != NULL);
if (histogram->priv->calculate_async)
pika_async_cancel_and_wait (histogram->priv->calculate_async);
context.histogram = histogram;
context.buffer = buffer;
context.buffer_rect = *buffer_rect;
if (mask)
{
context.mask = mask;
if (mask_rect)
context.mask_rect = *mask_rect;
else
context.mask_rect = *gegl_buffer_get_extent (mask);
}
pika_histogram_calculate_internal (NULL, &context);
pika_histogram_set_values (histogram,
context.n_components, context.n_bins,
context.values);
}
PikaAsync *
pika_histogram_calculate_async (PikaHistogram *histogram,
GeglBuffer *buffer,
const GeglRectangle *buffer_rect,
GeglBuffer *mask,
const GeglRectangle *mask_rect)
{
CalculateContext *context;
GeglRectangle rect;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
g_return_val_if_fail (buffer_rect != NULL, NULL);
if (histogram->priv->calculate_async)
pika_async_cancel_and_wait (histogram->priv->calculate_async);
gegl_rectangle_align_to_buffer (&rect, buffer_rect, buffer,
GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
context = g_slice_new0 (CalculateContext);
context->histogram = histogram;
context->buffer = gegl_buffer_new (&rect,
gegl_buffer_get_format (buffer));
context->buffer_rect = *buffer_rect;
pika_gegl_buffer_copy (buffer, &rect, GEGL_ABYSS_NONE,
context->buffer, NULL);
if (mask)
{
if (mask_rect)
context->mask_rect = *mask_rect;
else
context->mask_rect = *gegl_buffer_get_extent (mask);
gegl_rectangle_align_to_buffer (&rect, &context->mask_rect, mask,
GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
context->mask = gegl_buffer_new (&rect, gegl_buffer_get_format (mask));
pika_gegl_buffer_copy (mask, &rect, GEGL_ABYSS_NONE,
context->mask, NULL);
}
histogram->priv->calculate_async = pika_parallel_run_async (
(PikaRunAsyncFunc) pika_histogram_calculate_internal,
context);
pika_async_add_callback (
histogram->priv->calculate_async,
(PikaAsyncCallback) pika_histogram_calculate_async_callback,
context);
return histogram->priv->calculate_async;
}
void
pika_histogram_clear_values (PikaHistogram *histogram,
gint n_components)
{
g_return_if_fail (PIKA_IS_HISTOGRAM (histogram));
if (histogram->priv->calculate_async)
pika_async_cancel_and_wait (histogram->priv->calculate_async);
pika_histogram_set_values (histogram, n_components, 0, NULL);
}
#define HISTOGRAM_VALUE(c,i) (priv->values[(c) * priv->n_bins + (i)])
gdouble
pika_histogram_get_maximum (PikaHistogram *histogram,
PikaHistogramChannel channel)
{
PikaHistogramPrivate *priv;
gdouble max = 0.0;
gint x;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0.0);
priv = histogram->priv;
if (! priv->values ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0.0;
}
if (channel == PIKA_HISTOGRAM_RGB)
{
for (x = 0; x < priv->n_bins; x++)
{
max = MAX (max, HISTOGRAM_VALUE (PIKA_HISTOGRAM_RED, x));
max = MAX (max, HISTOGRAM_VALUE (PIKA_HISTOGRAM_GREEN, x));
max = MAX (max, HISTOGRAM_VALUE (PIKA_HISTOGRAM_BLUE, x));
}
}
else
{
for (x = 0; x < priv->n_bins; x++)
{
max = MAX (max, HISTOGRAM_VALUE (channel, x));
}
}
return max;
}
gdouble
pika_histogram_get_value (PikaHistogram *histogram,
PikaHistogramChannel channel,
gint bin)
{
PikaHistogramPrivate *priv;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0.0);
priv = histogram->priv;
if (! priv->values ||
(bin < 0 || bin >= priv->n_bins) ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0.0;
}
if (channel == PIKA_HISTOGRAM_RGB)
{
gdouble min = HISTOGRAM_VALUE (PIKA_HISTOGRAM_RED, bin);
min = MIN (min, HISTOGRAM_VALUE (PIKA_HISTOGRAM_GREEN, bin));
return MIN (min, HISTOGRAM_VALUE (PIKA_HISTOGRAM_BLUE, bin));
}
else
{
return HISTOGRAM_VALUE (channel, bin);
}
}
gdouble
pika_histogram_get_component (PikaHistogram *histogram,
gint component,
gint bin)
{
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0.0);
if (pika_histogram_n_components (histogram) > 2)
component++;
return pika_histogram_get_value (histogram, component, bin);
}
gint
pika_histogram_n_components (PikaHistogram *histogram)
{
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0);
if (histogram->priv->n_channels > 0)
return histogram->priv->n_channels - N_DERIVED_CHANNELS;
else
return 0;
}
gint
pika_histogram_n_bins (PikaHistogram *histogram)
{
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0);
return histogram->priv->n_bins;
}
gboolean
pika_histogram_has_channel (PikaHistogram *histogram,
PikaHistogramChannel channel)
{
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), FALSE);
switch (channel)
{
case PIKA_HISTOGRAM_VALUE:
return TRUE;
case PIKA_HISTOGRAM_RED:
case PIKA_HISTOGRAM_GREEN:
case PIKA_HISTOGRAM_BLUE:
case PIKA_HISTOGRAM_LUMINANCE:
case PIKA_HISTOGRAM_RGB:
return pika_histogram_n_components (histogram) >= 3;
case PIKA_HISTOGRAM_ALPHA:
return pika_histogram_n_components (histogram) == 2 ||
pika_histogram_n_components (histogram) == 4;
}
g_return_val_if_reached (FALSE);
}
gdouble
pika_histogram_get_count (PikaHistogram *histogram,
PikaHistogramChannel channel,
gint start,
gint end)
{
PikaHistogramPrivate *priv;
gint i;
gdouble count = 0.0;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0.0);
priv = histogram->priv;
if (! priv->values ||
start > end ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0.0;
}
if (channel == PIKA_HISTOGRAM_RGB)
return (pika_histogram_get_count (histogram,
PIKA_HISTOGRAM_RED, start, end) +
pika_histogram_get_count (histogram,
PIKA_HISTOGRAM_GREEN, start, end) +
pika_histogram_get_count (histogram,
PIKA_HISTOGRAM_BLUE, start, end));
start = CLAMP (start, 0, priv->n_bins - 1);
end = CLAMP (end, 0, priv->n_bins - 1);
for (i = start; i <= end; i++)
count += HISTOGRAM_VALUE (channel, i);
return count;
}
gdouble
pika_histogram_get_mean (PikaHistogram *histogram,
PikaHistogramChannel channel,
gint start,
gint end)
{
PikaHistogramPrivate *priv;
gint i;
gdouble mean = 0.0;
gdouble count;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0.0);
priv = histogram->priv;
if (! priv->values ||
start > end ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0.0;
}
start = CLAMP (start, 0, priv->n_bins - 1);
end = CLAMP (end, 0, priv->n_bins - 1);
if (channel == PIKA_HISTOGRAM_RGB)
{
for (i = start; i <= end; i++)
{
gdouble factor = (gdouble) i / (gdouble) (priv->n_bins - 1);
mean += (factor * HISTOGRAM_VALUE (PIKA_HISTOGRAM_RED, i) +
factor * HISTOGRAM_VALUE (PIKA_HISTOGRAM_GREEN, i) +
factor * HISTOGRAM_VALUE (PIKA_HISTOGRAM_BLUE, i));
}
}
else
{
for (i = start; i <= end; i++)
{
gdouble factor = (gdouble) i / (gdouble) (priv->n_bins - 1);
mean += factor * HISTOGRAM_VALUE (channel, i);
}
}
count = pika_histogram_get_count (histogram, channel, start, end);
if (count > 0.0)
return mean / count;
return mean;
}
gdouble
pika_histogram_get_median (PikaHistogram *histogram,
PikaHistogramChannel channel,
gint start,
gint end)
{
PikaHistogramPrivate *priv;
gint i;
gdouble sum = 0.0;
gdouble count;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), -1.0);
priv = histogram->priv;
if (! priv->values ||
start > end ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0.0;
}
start = CLAMP (start, 0, priv->n_bins - 1);
end = CLAMP (end, 0, priv->n_bins - 1);
count = pika_histogram_get_count (histogram, channel, start, end);
if (channel == PIKA_HISTOGRAM_RGB)
{
for (i = start; i <= end; i++)
{
sum += (HISTOGRAM_VALUE (PIKA_HISTOGRAM_RED, i) +
HISTOGRAM_VALUE (PIKA_HISTOGRAM_GREEN, i) +
HISTOGRAM_VALUE (PIKA_HISTOGRAM_BLUE, i));
if (sum * 2 > count)
return ((gdouble) i / (gdouble) (priv->n_bins - 1));
}
}
else
{
for (i = start; i <= end; i++)
{
sum += HISTOGRAM_VALUE (channel, i);
if (sum * 2 > count)
return ((gdouble) i / (gdouble) (priv->n_bins - 1));
}
}
return -1.0;
}
/*
* adapted from GNU ocrad 0.14 : page_image_io.cc : otsu_th
*
* N. Otsu, "A threshold selection method from gray-level histograms,"
* IEEE Trans. Systems, Man, and Cybernetics, vol. 9, no. 1, pp. 62-66, 1979.
*/
gdouble
pika_histogram_get_threshold (PikaHistogram *histogram,
PikaHistogramChannel channel,
gint start,
gint end)
{
PikaHistogramPrivate *priv;
gint i;
gint maxval;
gdouble *hist = NULL;
gdouble *chist = NULL;
gdouble *cmom = NULL;
gdouble hist_max = 0.0;
gdouble chist_max = 0.0;
gdouble cmom_max = 0.0;
gdouble bvar_max = 0.0;
gint threshold = 127;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), -1);
priv = histogram->priv;
if (! priv->values ||
start > end ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0;
}
start = CLAMP (start, 0, priv->n_bins - 1);
end = CLAMP (end, 0, priv->n_bins - 1);
maxval = end - start;
hist = g_newa (gdouble, maxval + 1);
chist = g_newa (gdouble, maxval + 1);
cmom = g_newa (gdouble, maxval + 1);
if (channel == PIKA_HISTOGRAM_RGB)
{
for (i = start; i <= end; i++)
hist[i - start] = (HISTOGRAM_VALUE (PIKA_HISTOGRAM_RED, i) +
HISTOGRAM_VALUE (PIKA_HISTOGRAM_GREEN, i) +
HISTOGRAM_VALUE (PIKA_HISTOGRAM_BLUE, i));
}
else
{
for (i = start; i <= end; i++)
hist[i - start] = HISTOGRAM_VALUE (channel, i);
}
hist_max = hist[0];
chist[0] = hist[0];
cmom[0] = 0;
for (i = 1; i <= maxval; i++)
{
if (hist[i] > hist_max)
hist_max = hist[i];
chist[i] = chist[i-1] + hist[i];
cmom[i] = cmom[i-1] + i * hist[i];
}
chist_max = chist[maxval];
cmom_max = cmom[maxval];
bvar_max = 0;
for (i = 0; i < maxval; ++i)
{
if (chist[i] > 0 && chist[i] < chist_max)
{
gdouble bvar;
bvar = (gdouble) cmom[i] / chist[i];
bvar -= (cmom_max - cmom[i]) / (chist_max - chist[i]);
bvar *= bvar;
bvar *= chist[i];
bvar *= chist_max - chist[i];
if (bvar > bvar_max)
{
bvar_max = bvar;
threshold = start + i;
}
}
}
return threshold;
}
gdouble
pika_histogram_get_std_dev (PikaHistogram *histogram,
PikaHistogramChannel channel,
gint start,
gint end)
{
PikaHistogramPrivate *priv;
gint i;
gdouble dev = 0.0;
gdouble count;
gdouble mean;
g_return_val_if_fail (PIKA_IS_HISTOGRAM (histogram), 0.0);
priv = histogram->priv;
if (! priv->values ||
start > end ||
! pika_histogram_map_channel (histogram, &channel))
{
return 0.0;
}
mean = pika_histogram_get_mean (histogram, channel, start, end);
count = pika_histogram_get_count (histogram, channel, start, end);
if (count == 0.0)
count = 1.0;
for (i = start; i <= end; i++)
{
gdouble value;
if (channel == PIKA_HISTOGRAM_RGB)
{
value = (HISTOGRAM_VALUE (PIKA_HISTOGRAM_RED, i) +
HISTOGRAM_VALUE (PIKA_HISTOGRAM_GREEN, i) +
HISTOGRAM_VALUE (PIKA_HISTOGRAM_BLUE, i));
}
else
{
value = pika_histogram_get_value (histogram, channel, i);
}
dev += value * SQR (((gdouble) i / (gdouble) (priv->n_bins - 1)) - mean);
}
return sqrt (dev / count);
}
/* private functions */
static gboolean
pika_histogram_map_channel (PikaHistogram *histogram,
PikaHistogramChannel *channel)
{
PikaHistogramPrivate *priv = histogram->priv;
if (*channel == PIKA_HISTOGRAM_RGB)
return pika_histogram_n_components (histogram) >= 3;
switch (*channel)
{
case PIKA_HISTOGRAM_ALPHA:
if (pika_histogram_n_components (histogram) == 2)
*channel = 1;
break;
case PIKA_HISTOGRAM_LUMINANCE:
*channel = pika_histogram_n_components (histogram) + 1;
break;
default:
break;
}
return *channel < priv->n_channels;
}
static void
pika_histogram_set_values (PikaHistogram *histogram,
gint n_components,
gint n_bins,
gdouble *values)
{
PikaHistogramPrivate *priv = histogram->priv;
gint n_channels = n_components;
gboolean notify_n_components = FALSE;
gboolean notify_n_bins = FALSE;
if (n_channels > 0)
n_channels += N_DERIVED_CHANNELS;
if (n_channels != priv->n_channels)
{
priv->n_channels = n_channels;
notify_n_components = TRUE;
}
if (n_bins != priv->n_bins)
{
priv->n_bins = n_bins;
notify_n_bins = TRUE;
}
if (values != priv->values)
{
if (priv->values)
g_free (priv->values);
priv->values = values;
}
if (notify_n_components)
g_object_notify (G_OBJECT (histogram), "n-components");
if (notify_n_bins)
g_object_notify (G_OBJECT (histogram), "n-bins");
g_object_notify (G_OBJECT (histogram), "values");
}
static void
pika_histogram_calculate_internal (PikaAsync *async,
CalculateContext *context)
{
CalculateData data;
PikaHistogramPrivate *priv;
const Babl *format;
const Babl *space;
priv = context->histogram->priv;
format = gegl_buffer_get_format (context->buffer);
space = babl_format_get_space (format);
if (babl_format_get_type (format, 0) == babl_type ("u8"))
context->n_bins = 256;
else
context->n_bins = 1024;
switch (pika_babl_format_get_base_type (format))
{
case PIKA_RGB:
case PIKA_INDEXED:
format = pika_babl_format (PIKA_RGB,
pika_babl_precision (PIKA_COMPONENT_TYPE_FLOAT,
priv->trc),
babl_format_has_alpha (format),
space);
break;
case PIKA_GRAY:
format = pika_babl_format (PIKA_GRAY,
pika_babl_precision (PIKA_COMPONENT_TYPE_FLOAT,
priv->trc),
babl_format_has_alpha (format),
space);
break;
default:
if (async)
pika_async_abort (async);
g_return_if_reached ();
}
context->n_components = babl_format_get_n_components (format);
data.async = async;
data.context = context;
data.format = format;
data.values_list = NULL;
gegl_parallel_distribute_area (
&context->buffer_rect, PIXELS_PER_THREAD, GEGL_SPLIT_STRATEGY_AUTO,
(GeglParallelDistributeAreaFunc) pika_histogram_calculate_area,
&data);
if (! async || ! pika_async_is_canceled (async))
{
gdouble *total_values = NULL;
gint n_values = (context->n_components + N_DERIVED_CHANNELS) *
context->n_bins;
GSList *iter;
for (iter = data.values_list; iter; iter = g_slist_next (iter))
{
gdouble *values = iter->data;
if (! total_values)
{
total_values = values;
}
else
{
gint i;
for (i = 0; i < n_values; i++)
total_values[i] += values[i];
g_free (values);
}
}
g_slist_free (data.values_list);
context->values = total_values;
if (async)
pika_async_finish (async, NULL);
}
else
{
g_slist_free_full (data.values_list, g_free);
if (async)
pika_async_abort (async);
}
}
static void
pika_histogram_calculate_area (const GeglRectangle *area,
CalculateData *data)
{
PikaAsync *async;
CalculateContext *context;
GeglBufferIterator *iter;
gdouble *values;
gint n_components;
gint n_bins;
gfloat n_bins_1f;
gfloat temp;
async = data->async;
context = data->context;
n_bins = context->n_bins;
n_components = context->n_components;
values = g_new0 (gdouble, (n_components + N_DERIVED_CHANNELS) * n_bins);
pika_atomic_slist_push_head (&data->values_list, values);
iter = gegl_buffer_iterator_new (context->buffer, area, 0,
data->format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
if (context->mask)
{
GeglRectangle mask_area = *area;
mask_area.x += context->mask_rect.x - context->buffer_rect.x;
mask_area.y += context->mask_rect.y - context->buffer_rect.y;
gegl_buffer_iterator_add (iter, context->mask, &mask_area, 0,
babl_format ("Y float"),
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
}
n_bins_1f = n_bins - 1;
#define VALUE(c,i) (*(temp = (i) * n_bins_1f, \
&values[(c) * n_bins + \
SIGNED_ROUND (SAFE_CLAMP (temp, \
0.0f, \
n_bins_1f))]))
#define CHECK_CANCELED(length) \
G_STMT_START \
{ \
if ((length) % 128 == 0 && async && pika_async_is_canceled (async)) \
{ \
gegl_buffer_iterator_stop (iter); \
\
return; \
} \
} \
G_STMT_END
while (gegl_buffer_iterator_next (iter))
{
const gfloat *data = iter->items[0].data;
gint length = iter->length;
gfloat max;
gfloat luminance;
CHECK_CANCELED (0);
if (context->mask)
{
const gfloat *mask_data = iter->items[1].data;
switch (n_components)
{
case 1:
while (length--)
{
const gdouble masked = *mask_data;
VALUE (0, data[0]) += masked;
data += n_components;
mask_data += 1;
CHECK_CANCELED (length);
}
break;
case 2:
while (length--)
{
const gdouble masked = *mask_data;
const gdouble weight = data[1];
VALUE (0, data[0]) += weight * masked;
VALUE (1, data[1]) += masked;
data += n_components;
mask_data += 1;
CHECK_CANCELED (length);
}
break;
case 3: /* calculate separate value values */
while (length--)
{
const gdouble masked = *mask_data;
VALUE (1, data[0]) += masked;
VALUE (2, data[1]) += masked;
VALUE (3, data[2]) += masked;
max = MAX (data[0], data[1]);
max = MAX (data[2], max);
VALUE (0, max) += masked;
luminance = PIKA_RGB_LUMINANCE (data[0], data[1], data[2]);
VALUE (4, luminance) += masked;
data += n_components;
mask_data += 1;
CHECK_CANCELED (length);
}
break;
case 4: /* calculate separate value values */
while (length--)
{
const gdouble masked = *mask_data;
const gdouble weight = data[3];
VALUE (1, data[0]) += weight * masked;
VALUE (2, data[1]) += weight * masked;
VALUE (3, data[2]) += weight * masked;
VALUE (4, data[3]) += masked;
max = MAX (data[0], data[1]);
max = MAX (data[2], max);
VALUE (0, max) += weight * masked;
luminance = PIKA_RGB_LUMINANCE (data[0], data[1], data[2]);
VALUE (5, luminance) += weight * masked;
data += n_components;
mask_data += 1;
CHECK_CANCELED (length);
}
break;
}
}
else /* no mask */
{
switch (n_components)
{
case 1:
while (length--)
{
VALUE (0, data[0]) += 1.0;
data += n_components;
CHECK_CANCELED (length);
}
break;
case 2:
while (length--)
{
const gdouble weight = data[1];
VALUE (0, data[0]) += weight;
VALUE (1, data[1]) += 1.0;
data += n_components;
CHECK_CANCELED (length);
}
break;
case 3: /* calculate separate value values */
while (length--)
{
VALUE (1, data[0]) += 1.0;
VALUE (2, data[1]) += 1.0;
VALUE (3, data[2]) += 1.0;
max = MAX (data[0], data[1]);
max = MAX (data[2], max);
VALUE (0, max) += 1.0;
luminance = PIKA_RGB_LUMINANCE (data[0], data[1], data[2]);
VALUE (4, luminance) += 1.0;
data += n_components;
CHECK_CANCELED (length);
}
break;
case 4: /* calculate separate value values */
while (length--)
{
const gdouble weight = data[3];
VALUE (1, data[0]) += weight;
VALUE (2, data[1]) += weight;
VALUE (3, data[2]) += weight;
VALUE (4, data[3]) += 1.0;
max = MAX (data[0], data[1]);
max = MAX (data[2], max);
VALUE (0, max) += weight;
luminance = PIKA_RGB_LUMINANCE (data[0], data[1], data[2]);
VALUE (5, luminance) += weight;
data += n_components;
CHECK_CANCELED (length);
}
break;
}
}
}
#undef VALUE
#undef CHECK_CANCELED
}
static void
pika_histogram_calculate_async_callback (PikaAsync *async,
CalculateContext *context)
{
context->histogram->priv->calculate_async = NULL;
if (pika_async_is_finished (async))
{
pika_histogram_set_values (context->histogram,
context->n_components, context->n_bins,
context->values);
}
g_object_unref (context->buffer);
if (context->mask)
g_object_unref (context->mask);
g_slice_free (CalculateContext, context);
}
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