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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 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"
#include <gegl.h>
#include "paint-types.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimppickable.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,
GimpPaintState paint_state,
guint32 time);
static void gimp_convolve_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options);
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,
GimpPaintState paint_state,
guint32 time)
{
switch (paint_state)
{
case GIMP_PAINT_STATE_MOTION:
gimp_convolve_motion (paint_core, drawable, paint_options);
break;
default:
break;
}
}
static void
gimp_convolve_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
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);
GimpImage *image;
TempBuf *area;
PixelRegion srcPR;
PixelRegion destPR;
PixelRegion tempPR;
guchar *buffer;
gdouble opacity;
gdouble rate;
gint bytes;
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (gimp_drawable_is_indexed (drawable))
return;
opacity = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
if (opacity == 0.0)
return;
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options);
if (! area)
return;
rate = options->rate;
rate *= gimp_paint_options_get_dynamic_rate (paint_options,
&paint_core->cur_coords);
gimp_convolve_calculate_matrix (convolve, options->type,
brush_core->brush->mask->width / 2,
brush_core->brush->mask->height / 2,
rate);
/* configure the source pixel region */
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
area->x, area->y, area->width, area->height, FALSE);
if (gimp_drawable_has_alpha (drawable))
{
bytes = srcPR.bytes;
buffer = g_malloc (area->height * bytes * area->width);
pixel_region_init_data (&tempPR, buffer,
bytes, bytes * area->width,
0, 0, area->width, area->height);
copy_region (&srcPR, &tempPR);
}
else
{
/* note: this particular approach needlessly convolves the totally-
opaque alpha channel. A faster approach would be to keep
tempPR the same number of bytes as srcPR, and extend the
paint_core_replace_canvas API to handle non-alpha images. */
bytes = srcPR.bytes + 1;
buffer = g_malloc (area->height * bytes * area->width);
pixel_region_init_data (&tempPR, buffer,
bytes, bytes * area->width,
0, 0, area->width, area->height);
add_alpha_region (&srcPR, &tempPR);
}
/* Convolve the region */
pixel_region_init_data (&tempPR, buffer,
bytes, bytes * area->width,
0, 0, area->width, area->height);
pixel_region_init_temp_buf (&destPR, area,
0, 0, area->width, area->height);
convolve_region (&tempPR, &destPR,
convolve->matrix, 3, convolve->matrix_divisor,
GIMP_NORMAL_CONVOL, TRUE);
g_free (buffer);
gimp_brush_core_replace_canvas (brush_core, drawable,
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_BLUR_CONVOLVE:
convolve->matrix[4] = MIN_BLUR + percent * (MAX_BLUR - MIN_BLUR);
break;
case GIMP_SHARPEN_CONVOLVE:
convolve->matrix[4] = MIN_SHARPEN + percent * (MAX_SHARPEN - MIN_SHARPEN);
break;
case GIMP_CUSTOM_CONVOLVE:
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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