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/* This file is an image processing operation for GEGL | ||
* | ||
* GEGL is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU Lesser General Public | ||
* License as published by the Free Software Foundation; either | ||
* version 3 of the License, or (at your option) any later version. | ||
* | ||
* GEGL 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 | ||
* Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public | ||
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>. | ||
* | ||
* Copyright 1997 Spencer Kimball | ||
* Copyright 2011 Hans Lo <[email protected]> | ||
*/ | ||
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#include "config.h" | ||
#include <glib/gi18n-lib.h> | ||
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#ifdef GEGL_CHANT_PROPERTIES | ||
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gegl_chant_double (mask_radius, _("Mask Radius"), 0.0, 50.0, 10.0, | ||
_("Mask Radius")) | ||
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gegl_chant_double (sharpness, _("Sharpness"), 0.0, 1.0, 0.5, | ||
_("Sharpness")) | ||
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gegl_chant_double (black, _("Percent Black"), 0.0, 1.0, 0.2, | ||
_("Percent Black")) | ||
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gegl_chant_double (white, _("Percent White"), 0.0, 1.0, 0.2, | ||
_("Percent White")) | ||
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#else | ||
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#define GEGL_CHANT_TYPE_AREA_FILTER | ||
#define GEGL_CHANT_C_FILE "photocopy.c" | ||
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#include "gegl-chant.h" | ||
#include <stdio.h> | ||
#include <math.h> | ||
#include <stdlib.h> | ||
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#define THRESHOLD 0.75 | ||
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static void prepare (GeglOperation *operation) | ||
{ | ||
GeglChantO *o; | ||
GeglOperationAreaFilter *op_area; | ||
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op_area = GEGL_OPERATION_AREA_FILTER (operation); | ||
o = GEGL_CHANT_PROPERTIES (operation); | ||
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gegl_operation_set_format (operation, "input", | ||
babl_format ("RGBA float")); | ||
gegl_operation_set_format (operation, "output", | ||
babl_format ("RGBA float")); | ||
} | ||
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static gboolean | ||
process (GeglOperation *operation, | ||
GeglBuffer *input, | ||
GeglBuffer *output, | ||
const GeglRectangle *result, | ||
gint level) | ||
{ | ||
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation); | ||
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GeglNode *gegl, *image, *write1, *write2, *grey, *blur1, *blur2; | ||
GeglBuffer *dest1 = gegl_buffer_new(result, babl_format ("Y float")); | ||
GeglBuffer *dest2 = gegl_buffer_new(result, babl_format ("Y float")); | ||
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gegl = gegl_node_new(); | ||
image = gegl_node_new_child(gegl, | ||
"operation", "gegl:buffer-source", | ||
"buffer", input, | ||
NULL); | ||
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grey = gegl_node_new_child(gegl, | ||
"operation", "gegl:grey", | ||
NULL); | ||
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blur1 = gegl_node_new_child(gegl, | ||
"operation", "gegl:gaussian-blur", | ||
"std_dev_x", 1.0 - o->sharpness, | ||
"std_dev_y", 1.0 - o->sharpness, | ||
NULL); | ||
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blur2 = gegl_node_new_child(gegl, | ||
"operation", "gegl:gaussian-blur", | ||
"std_dev_x", o->mask_radius, | ||
"std_dev_y", o->mask_radius, | ||
NULL); | ||
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write1 = gegl_node_new_child(gegl, | ||
"operation", "gegl:buffer-sink", | ||
"buffer", &dest1, NULL); | ||
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write2 = gegl_node_new_child(gegl, | ||
"operation", "gegl:buffer-sink", | ||
"buffer", &dest2, NULL); | ||
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gegl_node_link_many (image, grey, blur1, write1, NULL); | ||
gegl_node_process (write1); | ||
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gegl_node_link_many (image, grey, blur2, write2, NULL); | ||
gegl_node_process (write2); | ||
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GeglSampler *sampler1 = gegl_buffer_sampler_new (dest1, | ||
babl_format ("Y float"), | ||
GEGL_SAMPLER_CUBIC); | ||
GeglSampler *sampler2 = gegl_buffer_sampler_new (dest2, | ||
babl_format ("Y float"), | ||
GEGL_SAMPLER_CUBIC); | ||
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gfloat *dst_buf = g_slice_alloc (result->width * result->height * 1 * sizeof(gfloat)); | ||
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gint n_pixels = result->width * result->height; | ||
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gfloat pixel1, pixel2; | ||
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gfloat *out_pixel = dst_buf; | ||
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gint x = result->x; /* initial x */ | ||
gint y = result->y; /* and y coordinates */ | ||
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gdouble diff; | ||
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while (n_pixels--) | ||
{ | ||
gegl_sampler_get (sampler1, | ||
x, | ||
y, | ||
NULL, | ||
&pixel1); | ||
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gegl_sampler_get (sampler2, | ||
x, | ||
y, | ||
NULL, | ||
&pixel2); | ||
diff = pixel1/pixel2; | ||
if (diff < THRESHOLD) | ||
{ | ||
*out_pixel = 1.0; | ||
} | ||
else | ||
{ | ||
*out_pixel = pixel1; | ||
} | ||
out_pixel += 1; | ||
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/* update x and y coordinates */ | ||
x++; | ||
if (x>=result->x + result->width) | ||
{ | ||
x=result->x; | ||
y++; | ||
} | ||
} | ||
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gegl_buffer_set (output, result, 0, babl_format ("Y float"), dst_buf, GEGL_AUTO_ROWSTRIDE); | ||
g_slice_free1 (result->width * result->height * 1 * sizeof(gfloat), dst_buf); | ||
g_object_unref (sampler1); | ||
g_object_unref (sampler2); | ||
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g_object_unref (gegl); | ||
return TRUE; | ||
} | ||
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static gdouble | ||
compute_ramp (guchar *dest1, | ||
guchar *dest2, | ||
gint length, | ||
gdouble pct, | ||
gint under_threshold) | ||
{ | ||
gint hist[2000]; | ||
gdouble diff; | ||
gint count; | ||
gint i; | ||
gint sum; | ||
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memset (hist, 0, sizeof (int) * 2000); | ||
count = 0; | ||
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for (i = 0; i < length; i++) | ||
{ | ||
if (*dest2 != 0) | ||
{ | ||
diff = (gdouble) *dest1 / (gdouble) *dest2; | ||
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if (under_threshold) | ||
{ | ||
if (diff < THRESHOLD) | ||
{ | ||
hist[(int) (diff * 1000)] += 1; | ||
count += 1; | ||
} | ||
} | ||
else | ||
{ | ||
if (diff >= THRESHOLD && diff < 2.0) | ||
{ | ||
hist[(int) (diff * 1000)] += 1; | ||
count += 1; | ||
} | ||
} | ||
} | ||
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dest1++; | ||
dest2++; | ||
} | ||
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if (pct == 0.0 || count == 0) | ||
return (under_threshold ? 1.0 : 0.0); | ||
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sum = 0; | ||
for (i = 0; i < 2000; i++) | ||
{ | ||
sum += hist[i]; | ||
if (((gdouble) sum / (gdouble) count) > pct) | ||
{ | ||
if (under_threshold) | ||
return (THRESHOLD - (gdouble) i / 1000.0); | ||
else | ||
return ((gdouble) i / 1000.0 - THRESHOLD); | ||
} | ||
} | ||
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return (under_threshold ? 0.0 : 1.0); | ||
} | ||
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static void | ||
gegl_chant_class_init (GeglChantClass *klass) | ||
{ | ||
GeglOperationClass *operation_class; | ||
GeglOperationFilterClass *filter_class; | ||
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operation_class = GEGL_OPERATION_CLASS (klass); | ||
filter_class = GEGL_OPERATION_FILTER_CLASS (klass); | ||
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operation_class->prepare = prepare; | ||
filter_class->process = process; | ||
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gegl_operation_class_set_keys (operation_class, | ||
"categories" , "artistic", | ||
"name" , "gegl:photocopy", | ||
"description", _("Photocopy effect"), | ||
NULL); | ||
} | ||
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#endif |