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gimp/app/paint/gimpconvolve.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "paint-types.h"
#include "gegl/gimp-gegl-loops.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpdrawable.h"
#include "core/gimpdynamics.h"
#include "core/gimpimage.h"
#include "core/gimppickable.h"
#include "core/gimpsymmetry.h"
#include "core/gimptempbuf.h"
#include "gimpconvolve.h"
#include "gimpconvolveoptions.h"
#include "gimp-intl.h"
#define FIELD_COLS 4
#define MIN_BLUR 64 /* (8/9 original pixel) */
#define MAX_BLUR 0.25 /* (1/33 original pixel) */
#define MIN_SHARPEN -512
#define MAX_SHARPEN -64
static void gimp_convolve_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
GimpPaintState paint_state,
guint32 time);
static void gimp_convolve_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym);
static void gimp_convolve_calculate_matrix (GimpConvolve *convolve,
GimpConvolveType type,
gint radius_x,
gint radius_y,
gdouble rate);
static gdouble gimp_convolve_sum_matrix (const gfloat *matrix);
G_DEFINE_TYPE (GimpConvolve, gimp_convolve, GIMP_TYPE_BRUSH_CORE)
void
gimp_convolve_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_CONVOLVE,
GIMP_TYPE_CONVOLVE_OPTIONS,
"gimp-convolve",
_("Convolve"),
"gimp-tool-blur");
}
static void
gimp_convolve_class_init (GimpConvolveClass *klass)
{
GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
paint_core_class->paint = gimp_convolve_paint;
}
static void
gimp_convolve_init (GimpConvolve *convolve)
{
gint i;
for (i = 0; i < 9; i++)
convolve->matrix[i] = 1.0;
convolve->matrix_divisor = 9.0;
}
static void
gimp_convolve_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
GimpPaintState paint_state,
guint32 time)
{
switch (paint_state)
{
case GIMP_PAINT_STATE_MOTION:
gimp_convolve_motion (paint_core, drawable, paint_options, sym);
break;
default:
break;
}
}
static void
gimp_convolve_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym)
{
GimpConvolve *convolve = GIMP_CONVOLVE (paint_core);
GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
GimpConvolveOptions *options = GIMP_CONVOLVE_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpDynamics *dynamics = GIMP_BRUSH_CORE (paint_core)->dynamics;
GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
GeglBuffer *paint_buffer;
gint paint_buffer_x;
gint paint_buffer_y;
GimpTempBuf *temp_buf;
GeglBuffer *convolve_buffer;
gdouble fade_point;
gdouble opacity;
gdouble rate;
const GimpCoords *coords;
gint paint_width, paint_height;
gint n_strokes;
gint i;
fade_point = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
coords = gimp_symmetry_get_origin (sym);
opacity = gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_OPACITY,
coords,
paint_options,
fade_point);
if (opacity == 0.0)
return;
gimp_brush_core_eval_transform_dynamics (GIMP_BRUSH_CORE (paint_core),
drawable,
paint_options,
coords);
n_strokes = gimp_symmetry_get_size (sym);
for (i = 0; i < n_strokes; i++)
{
coords = gimp_symmetry_get_coords (sym, i);
gimp_brush_core_eval_transform_symmetry (brush_core, sym, i);
paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
paint_options,
GIMP_LAYER_MODE_NORMAL,
coords,
&paint_buffer_x,
&paint_buffer_y,
&paint_width,
&paint_height);
if (! paint_buffer)
continue;
rate = (options->rate *
gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_RATE,
coords,
paint_options,
fade_point));
gimp_convolve_calculate_matrix (convolve, options->type,
gimp_brush_get_width (brush_core->brush) / 2,
gimp_brush_get_height (brush_core->brush) / 2,
rate);
/* need a linear buffer for gimp_gegl_convolve() */
temp_buf = gimp_temp_buf_new (gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer),
gegl_buffer_get_format (paint_buffer));
convolve_buffer = gimp_temp_buf_create_buffer (temp_buf);
gimp_temp_buf_unref (temp_buf);
gimp_gegl_buffer_copy (
gimp_drawable_get_buffer (drawable),
GEGL_RECTANGLE (paint_buffer_x,
paint_buffer_y,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer)),
GEGL_ABYSS_NONE,
convolve_buffer,
GEGL_RECTANGLE (0, 0, 0, 0));
gimp_gegl_convolve (convolve_buffer,
GEGL_RECTANGLE (0, 0,
gegl_buffer_get_width (convolve_buffer),
gegl_buffer_get_height (convolve_buffer)),
paint_buffer,
GEGL_RECTANGLE (0, 0,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer)),
convolve->matrix, 3, convolve->matrix_divisor,
GIMP_NORMAL_CONVOL, TRUE);
g_object_unref (convolve_buffer);
gimp_brush_core_replace_canvas (brush_core, drawable,
coords,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_paint_options_get_brush_mode (paint_options),
1.0,
GIMP_PAINT_INCREMENTAL);
}
}
static void
gimp_convolve_calculate_matrix (GimpConvolve *convolve,
GimpConvolveType type,
gint radius_x,
gint radius_y,
gdouble rate)
{
/* find percent of tool pressure */
const gdouble percent = MIN (rate / 100.0, 1.0);
convolve->matrix[0] = (radius_x && radius_y) ? 1.0 : 0.0;
convolve->matrix[1] = (radius_y) ? 1.0 : 0.0;
convolve->matrix[2] = (radius_x && radius_y) ? 1.0 : 0.0;
convolve->matrix[3] = (radius_x) ? 1.0 : 0.0;
/* get the appropriate convolution matrix and size and divisor */
switch (type)
{
case GIMP_CONVOLVE_BLUR:
convolve->matrix[4] = MIN_BLUR + percent * (MAX_BLUR - MIN_BLUR);
break;
case GIMP_CONVOLVE_SHARPEN:
convolve->matrix[4] = MIN_SHARPEN + percent * (MAX_SHARPEN - MIN_SHARPEN);
break;
}
convolve->matrix[5] = (radius_x) ? 1.0 : 0.0;
convolve->matrix[6] = (radius_x && radius_y) ? 1.0 : 0.0;
convolve->matrix[7] = (radius_y) ? 1.0 : 0.0;
convolve->matrix[8] = (radius_x && radius_y) ? 1.0 : 0.0;
convolve->matrix_divisor = gimp_convolve_sum_matrix (convolve->matrix);
}
static gdouble
gimp_convolve_sum_matrix (const gfloat *matrix)
{
gdouble sum = 0.0;
gint i;
for (i = 0; i < 9; i++)
sum += matrix[i];
return sum;
}
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