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gimp/app/paint/gimpheal.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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "paint-types.h"
#include "gegl/gimp-gegl-utils.h"
#include "core/gimpbrush.h"
#include "core/gimpdrawable.h"
#include "core/gimpdynamics.h"
#include "core/gimpdynamicsoutput.h"
#include "core/gimperror.h"
#include "core/gimpimage.h"
#include "core/gimppickable.h"
#include "core/gimptempbuf.h"
#include "gimpheal.h"
#include "gimpsourceoptions.h"
#include "gimp-intl.h"
/* NOTES
*
* The method used here is similar to the lighting invariant correctin
* method but slightly different: we do not divide the RGB components,
* but substract them I2 = I0 - I1, where I0 is the sample image to be
* corrected, I1 is the reference pattern. Then we solve DeltaI=0
* (Laplace) with I2 Dirichlet conditions at the borders of the
* mask. The solver is a unoptimized red/black checker Gauss-Siedel
* with an over-relaxation factor of 1.8. It can benefit from a
* multi-grid evaluation of an initial solution before the main
* iteration loop.
*
* I reduced the convergence criteria to 0.1% (0.001) as we are
* dealing here with RGB integer components, more is overkill.
*
* Jean-Yves Couleaud cjyves@free.fr
*/
static gboolean gimp_heal_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
GError **error);
static void gimp_heal_motion (GimpSourceCore *source_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
gdouble opacity,
GimpPickable *src_pickable,
GeglBuffer *src_buffer,
GeglRectangle *src_rect,
gint src_offset_x,
gint src_offset_y,
GeglBuffer *paint_buffer,
gint paint_buffer_x,
gint paint_buffer_y,
gint paint_area_offset_x,
gint paint_area_offset_y,
gint paint_area_width,
gint paint_area_height);
G_DEFINE_TYPE (GimpHeal, gimp_heal, GIMP_TYPE_SOURCE_CORE)
#define parent_class gimp_heal_parent_class
void
gimp_heal_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_HEAL,
GIMP_TYPE_SOURCE_OPTIONS,
"gimp-heal",
_("Heal"),
"gimp-tool-heal");
}
static void
gimp_heal_class_init (GimpHealClass *klass)
{
GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
GimpSourceCoreClass *source_core_class = GIMP_SOURCE_CORE_CLASS (klass);
paint_core_class->start = gimp_heal_start;
source_core_class->motion = gimp_heal_motion;
}
static void
gimp_heal_init (GimpHeal *heal)
{
}
static gboolean
gimp_heal_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
GError **error)
{
GimpSourceCore *source_core = GIMP_SOURCE_CORE (paint_core);
if (! GIMP_PAINT_CORE_CLASS (parent_class)->start (paint_core, drawable,
paint_options, coords,
error))
{
return FALSE;
}
if (! source_core->set_source && gimp_drawable_is_indexed (drawable))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Healing does not operate on indexed layers."));
return FALSE;
}
return TRUE;
}
/* Subtract bottom from top and store in result as a double
*/
static void
gimp_heal_sub (GeglBuffer *top_buffer,
const GeglRectangle *top_rect,
GeglBuffer *bottom_buffer,
const GeglRectangle *bottom_rect,
GeglBuffer *result_buffer,
const GeglRectangle *result_rect)
{
GeglBufferIterator *iter;
const Babl *format = gegl_buffer_get_format (top_buffer);
gint bpp = babl_format_get_bytes_per_pixel (format);
gegl_buffer_set_format (top_buffer, babl_format_n (babl_type ("u8"), bpp));
gegl_buffer_set_format (bottom_buffer, babl_format_n (babl_type ("u8"), bpp));
iter = gegl_buffer_iterator_new (top_buffer, top_rect, 0, NULL,
GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
gegl_buffer_iterator_add (iter, bottom_buffer, bottom_rect, 0, NULL,
GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
gegl_buffer_iterator_add (iter, result_buffer, result_rect, 0,
babl_format_n (babl_type ("double"), bpp),
GEGL_BUFFER_WRITE, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
guchar *t = iter->data[0];
guchar *b = iter->data[1];
gdouble *r = iter->data[2];
gint length = iter->length * bpp;
while (length--)
*r++ = (gdouble) *t++ - (gdouble) *b++;
}
gegl_buffer_set_format (top_buffer, NULL);
gegl_buffer_set_format (bottom_buffer, NULL);
}
/* Add first to second and store in result
*/
static void
gimp_heal_add (GeglBuffer *first_buffer,
const GeglRectangle *first_rect,
GeglBuffer *second_buffer,
const GeglRectangle *second_rect,
GeglBuffer *result_buffer,
const GeglRectangle *result_rect)
{
GeglBufferIterator *iter;
const Babl *format = gegl_buffer_get_format (result_buffer);
gint bpp = babl_format_get_bytes_per_pixel (format);
gegl_buffer_set_format (second_buffer, babl_format_n (babl_type ("u8"), bpp));
gegl_buffer_set_format (result_buffer, babl_format_n (babl_type ("u8"), bpp));
iter = gegl_buffer_iterator_new (first_buffer, first_rect, 0,
babl_format_n (babl_type ("double"), bpp),
GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
gegl_buffer_iterator_add (iter, second_buffer, second_rect, 0, NULL,
GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
gegl_buffer_iterator_add (iter, result_buffer, result_rect, 0, NULL,
GEGL_BUFFER_WRITE, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
gdouble *f = iter->data[0];
guchar *s = iter->data[1];
guchar *r = iter->data[2];
gint length = iter->length * bpp;
while (length--)
{
gdouble tmp = ROUND (*f++ + (gdouble) *s++);
*r++ = (guchar) CLAMP0255 (tmp);
}
}
gegl_buffer_set_format (second_buffer, NULL);
gegl_buffer_set_format (result_buffer, NULL);
}
/* Perform one iteration of the laplace solver for matrix. Store the
* result in solution and return the square of the cummulative error
* of the solution.
*/
static gdouble
gimp_heal_laplace_iteration (gdouble *matrix,
gint height,
gint depth,
gint width,
gdouble *solution,
guchar *mask)
{
const gint rowstride = width * depth;
gint i, j, k, off, offm, offm0, off0;
gdouble tmp, diff;
gdouble err = 0.0;
const gdouble w = 1.80 * 0.25; /* Over-relaxation = 1.8 */
/* we use a red/black checker model of the discretization grid */
/* do reds */
for (i = 0; i < height; i++)
{
off0 = i * rowstride;
offm0 = i * width;
for (j = i % 2; j < width; j += 2)
{
off = off0 + j * depth;
offm = offm0 + j;
if ((0 == mask[offm]) ||
(i == 0) || (i == (height - 1)) ||
(j == 0) || (j == (width - 1)))
{
/* do nothing at the boundary or outside mask */
for (k = 0; k < depth; k++)
solution[off + k] = matrix[off + k];
}
else
{
/* Use Gauss Siedel to get the correction factor then
* over-relax it
*/
for (k = 0; k < depth; k++)
{
tmp = solution[off + k];
solution[off + k] = (matrix[off + k] +
w *
(matrix[off - depth + k] + /* west */
matrix[off + depth + k] + /* east */
matrix[off - rowstride + k] + /* north */
matrix[off + rowstride + k] - 4.0 *
matrix[off+k])); /* south */
diff = solution[off + k] - tmp;
err += diff * diff;
}
}
}
}
/* Do blacks
*
* As we've done the reds earlier, we can use them right now to
* accelerate the convergence. So we have "solution" in the solver
* instead of "matrix" above
*/
for (i = 0; i < height; i++)
{
off0 = i * rowstride;
offm0 = i * width;
for (j = (i % 2) ? 0 : 1; j < width; j += 2)
{
off = off0 + j * depth;
offm = offm0 + j;
if ((0 == mask[offm]) ||
(i == 0) || (i == (height - 1)) ||
(j == 0) || (j == (width - 1)))
{
/* do nothing at the boundary or outside mask */
for (k = 0; k < depth; k++)
solution[off + k] = matrix[off + k];
}
else
{
/* Use Gauss Siedel to get the correction factor then
* over-relax it
*/
for (k = 0; k < depth; k++)
{
tmp = solution[off + k];
solution[off + k] = (matrix[off + k] +
w *
(solution[off - depth + k] + /* west */
solution[off + depth + k] + /* east */
solution[off - rowstride + k] + /* north */
solution[off + rowstride + k] - 4.0 *
matrix[off+k])); /* south */
diff = solution[off + k] - tmp;
err += diff*diff;
}
}
}
}
return err;
}
/* Solve the laplace equation for matrix and store the result in solution.
*/
static void
gimp_heal_laplace_loop (gdouble *matrix,
gint height,
gint depth,
gint width,
gdouble *solution,
guchar *mask)
{
#define EPSILON 0.001
#define MAX_ITER 500
gint i;
/* repeat until convergence or max iterations */
for (i = 0; i < MAX_ITER; i++)
{
gdouble sqr_err;
/* do one iteration and store the amount of error */
sqr_err = gimp_heal_laplace_iteration (matrix, height, depth, width,
solution, mask);
/* copy solution to matrix */
memcpy (matrix, solution, width * height * depth * sizeof (double));
if (sqr_err < EPSILON)
break;
}
}
/* Original Algorithm Design:
*
* T. Georgiev, "Photoshop Healing Brush: a Tool for Seamless Cloning
* http://www.tgeorgiev.net/Photoshop_Healing.pdf
*/
static void
gimp_heal (GeglBuffer *src_buffer,
const GeglRectangle *src_rect,
GeglBuffer *dest_buffer,
const GeglRectangle *dest_rect,
GeglBuffer *mask_buffer,
const GeglRectangle *mask_rect)
{
const Babl *src_format;
const Babl *dest_format;
gint src_bpp;
gint dest_bpp;
gint width;
gint height;
gdouble *i_1;
gdouble *i_2;
GeglBuffer *i_1_buffer;
GeglBuffer *i_2_buffer;
guchar *mask;
src_format = gegl_buffer_get_format (src_buffer);
dest_format = gegl_buffer_get_format (dest_buffer);
src_bpp = babl_format_get_bytes_per_pixel (src_format);
dest_bpp = babl_format_get_bytes_per_pixel (dest_format);
width = gegl_buffer_get_width (src_buffer);
height = gegl_buffer_get_height (src_buffer);
g_return_if_fail (src_bpp == dest_bpp);
i_1 = g_new (gdouble, width * height * src_bpp);
i_2 = g_new (gdouble, width * height * src_bpp);
i_1_buffer =
gegl_buffer_linear_new_from_data (i_1,
babl_format_n (babl_type ("double"),
src_bpp),
GEGL_RECTANGLE (0, 0, width, height),
GEGL_AUTO_ROWSTRIDE,
(GDestroyNotify) g_free, i_1);
i_2_buffer =
gegl_buffer_linear_new_from_data (i_2,
babl_format_n (babl_type ("double"),
src_bpp),
GEGL_RECTANGLE (0, 0, width, height),
GEGL_AUTO_ROWSTRIDE,
(GDestroyNotify) g_free, i_2);
/* substract pattern from image and store the result as a double in i_1 */
gimp_heal_sub (dest_buffer, dest_rect,
src_buffer, src_rect,
i_1_buffer, GEGL_RECTANGLE (0, 0, width, height));
mask = g_new (guchar, mask_rect->width * mask_rect->height);
gegl_buffer_get (mask_buffer, mask_rect, 1.0, babl_format ("Y u8"),
mask, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
/* FIXME: is a faster implementation needed? */
gimp_heal_laplace_loop (i_1, height, src_bpp, width, i_2, mask);
g_free (mask);
/* add solution to original image and store in dest */
gimp_heal_add (i_2_buffer, GEGL_RECTANGLE (0, 0, width, height),
src_buffer, src_rect,
dest_buffer, dest_rect);
g_object_unref (i_1_buffer);
g_object_unref (i_2_buffer);
}
static void
gimp_heal_motion (GimpSourceCore *source_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
gdouble opacity,
GimpPickable *src_pickable,
GeglBuffer *src_buffer,
GeglRectangle *src_rect,
gint src_offset_x,
gint src_offset_y,
GeglBuffer *paint_buffer,
gint paint_buffer_x,
gint paint_buffer_y,
gint paint_area_offset_x,
gint paint_area_offset_y,
gint paint_area_width,
gint paint_area_height)
{
GimpPaintCore *paint_core = GIMP_PAINT_CORE (source_core);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpDynamics *dynamics = GIMP_BRUSH_CORE (paint_core)->dynamics;
GimpDynamicsOutput *hardness_output;
GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
GeglBuffer *src_copy;
GeglBuffer *mask_buffer;
const GimpTempBuf *mask_buf;
gdouble fade_point;
gdouble hardness;
hardness_output = gimp_dynamics_get_output (dynamics,
GIMP_DYNAMICS_OUTPUT_HARDNESS);
fade_point = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
hardness = gimp_dynamics_output_get_linear_value (hardness_output,
coords,
paint_options,
fade_point);
mask_buf = gimp_brush_core_get_brush_mask (GIMP_BRUSH_CORE (source_core),
coords,
GIMP_BRUSH_HARD,
hardness);
/* check that all buffers are of the same size */
if (src_rect->width != gegl_buffer_get_width (paint_buffer) ||
src_rect->height != gegl_buffer_get_height (paint_buffer))
{
/* this generally means that the source point has hit the edge
* of the layer, so it is not an error and we should not
* complain, just don't do anything
*/
return;
}
src_copy =
gegl_buffer_new (GEGL_RECTANGLE (0, 0,
src_rect->width,
src_rect->height),
gimp_drawable_get_format_with_alpha (drawable));
gegl_buffer_copy (src_buffer,
src_rect,
src_copy,
GEGL_RECTANGLE (0, 0,
src_rect->width,
src_rect->height));
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)),
paint_buffer,
GEGL_RECTANGLE (paint_area_offset_x,
paint_area_offset_y,
paint_area_width,
paint_area_height));
mask_buffer = gimp_temp_buf_create_buffer ((GimpTempBuf *) mask_buf);
gimp_heal (src_copy,
GEGL_RECTANGLE (0, 0,
gegl_buffer_get_width (src_copy),
gegl_buffer_get_height (src_copy)),
paint_buffer,
GEGL_RECTANGLE (paint_area_offset_x,
paint_area_offset_y,
paint_area_width,
paint_area_height),
mask_buffer,
GEGL_RECTANGLE (0, 0,
gegl_buffer_get_width (mask_buffer),
gegl_buffer_get_height (mask_buffer)));
g_object_unref (src_copy);
g_object_unref (mask_buffer);
/* replace the canvas with our healed data */
gimp_brush_core_replace_canvas (GIMP_BRUSH_CORE (paint_core), drawable,
coords,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_paint_options_get_brush_mode (paint_options),
hardness,
GIMP_PAINT_INCREMENTAL);
}
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