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gimp/app/operations/gimpcageconfig.c

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/* GIMP - The GNU Image Manipulation Program
*
* gimpcageconfig.c
* Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
*
* 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 <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libgimpconfig/gimpconfig.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "operations-types.h"
#include "gimpcageconfig.h"
/*#define DEBUG_CAGE */
/* This DELTA is aimed to not have handle on exact pixel during computation,
* to avoid particular case. It shouldn't be so useful, but it's a double
* safety. */
#define DELTA 0.010309278351
static void gimp_cage_config_finalize (GObject *object);
static void gimp_cage_config_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_cage_config_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_cage_config_compute_scaling_factor (GimpCageConfig *gcc);
static void gimp_cage_config_compute_edges_normal (GimpCageConfig *gcc);
G_DEFINE_TYPE_WITH_CODE (GimpCageConfig, gimp_cage_config,
GIMP_TYPE_SETTINGS,
G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
NULL))
#define parent_class gimp_cage_config_parent_class
#ifdef DEBUG_CAGE
static void
print_cage (GimpCageConfig *gcc)
{
gint i;
GeglRectangle bounding_box;
GimpCagePoint *point;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
bounding_box = gimp_cage_config_get_bounding_box (gcc);
for (i = 0; i < gcc->cage_points->len; i++)
{
point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
g_printerr ("cgx: %.0f cgy: %.0f cvdx: %.0f cvdy: %.0f sf: %.2f normx: %.2f normy: %.2f %s\n",
point->src_point.x + ((gcc->cage_mode==GIMP_CAGE_MODE_CAGE_CHANGE)?gcc->displacement_x:0),
point->src_point.y + ((gcc->cage_mode==GIMP_CAGE_MODE_CAGE_CHANGE)?gcc->displacement_y:0),
point->dest_point.x + ((gcc->cage_mode==GIMP_CAGE_MODE_DEFORM)?gcc->displacement_x:0),
point->dest_point.y + ((gcc->cage_mode==GIMP_CAGE_MODE_DEFORM)?gcc->displacement_y:0),
point->edge_scaling_factor,
point->edge_normal.x,
point->edge_normal.y,
((point->selected) ? "S" : "NS"));
}
g_printerr ("bounding box: x: %d y: %d width: %d height: %d\n", bounding_box.x, bounding_box.y, bounding_box.width, bounding_box.height);
g_printerr ("disp x: %f disp y: %f\n", gcc->displacement_x, gcc->displacement_y);
g_printerr ("done\n");
}
#endif
static void
gimp_cage_config_class_init (GimpCageConfigClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = gimp_cage_config_set_property;
object_class->get_property = gimp_cage_config_get_property;
object_class->finalize = gimp_cage_config_finalize;
}
static void
gimp_cage_config_init (GimpCageConfig *self)
{
/*pre-allocation for 50 vertices for the cage.*/
self->cage_points = g_array_sized_new (FALSE, FALSE, sizeof(GimpCagePoint), 50);
}
static void
gimp_cage_config_finalize (GObject *object)
{
GimpCageConfig *gcc = GIMP_CAGE_CONFIG (object);
g_array_free (gcc->cage_points, TRUE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_cage_config_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_cage_config_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;
}
}
/**
* gimp_cage_config_get_n_points:
* @gcc: the cage config
*
* Returns: the number of points of the cage
*/
guint
gimp_cage_config_get_n_points (GimpCageConfig *gcc)
{
return gcc->cage_points->len;
}
/**
* gimp_cage_config_add_cage_point:
* @gcc: the cage config
* @x: x value of the new point
* @y: y value of the new point
*
* Add a new point in the last index of the polygon of the cage.
* Point is added in both source and destination cage
*/
void
gimp_cage_config_add_cage_point (GimpCageConfig *gcc,
gdouble x,
gdouble y)
{
gimp_cage_config_insert_cage_point (gcc, gcc->cage_points->len, x, y);
}
/**
* gimp_cage_config_insert_cage_point:
* @gcc: the cage config
* @point_number: index where the point will be inserted
* @x: x value of the new point
* @y: y value of the new point
*
* Insert a new point in the polygon of the cage at the given index.
* Point is added in both source and destination cage
*/
void
gimp_cage_config_insert_cage_point (GimpCageConfig *gcc,
gint point_number,
gdouble x,
gdouble y)
{
GimpCagePoint point;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
g_return_if_fail (point_number <= gcc->cage_points->len);
g_return_if_fail (point_number >= 0);
point.src_point.x = x + DELTA;
point.src_point.y = y + DELTA;
point.dest_point.x = x + DELTA;
point.dest_point.y = y + DELTA;
g_array_insert_val (gcc->cage_points, point_number, point);
gimp_cage_config_compute_scaling_factor (gcc);
gimp_cage_config_compute_edges_normal (gcc);
}
/**
* gimp_cage_config_remove_last_cage_point:
* @gcc: the cage config
*
* Remove the last point of the cage, in both source and destination cage
*/
void
gimp_cage_config_remove_last_cage_point (GimpCageConfig *gcc)
{
gimp_cage_config_remove_cage_point (gcc, gcc->cage_points->len - 1);
}
/**
* gimp_cage_config_remove_cage_point:
* @gcc: the cage config
* @point_number: the index of the point to remove
*
* Remove the given point from the cage
*/
void
gimp_cage_config_remove_cage_point (GimpCageConfig *gcc,
gint point_number)
{
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
g_return_if_fail (point_number < gcc->cage_points->len);
g_return_if_fail (point_number >= 0);
if (gcc->cage_points->len > 0)
g_array_remove_index (gcc->cage_points, gcc->cage_points->len - 1);
gimp_cage_config_compute_scaling_factor (gcc);
gimp_cage_config_compute_edges_normal (gcc);
}
/**
* gimp_cage_config_remove_selected_points:
* @gcc: the cage config
*
* Remove all the selected points from the cage
*/
void
gimp_cage_config_remove_selected_points (GimpCageConfig *gcc)
{
gint i;
GimpCagePoint *point;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
for (i = 0; i < gcc->cage_points->len; i++)
{
point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
if (point->selected)
{
g_array_remove_index (gcc->cage_points, i);
i--;
}
}
gimp_cage_config_compute_scaling_factor (gcc);
gimp_cage_config_compute_edges_normal (gcc);
}
/**
* gimp_cage_config_get_point_coordinate:
* @gcc: the cage config
* @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
* @point_number: the index of the point to return
*
* Returns: the real position of the given point, as a GimpVector2
*/
GimpVector2
gimp_cage_config_get_point_coordinate (GimpCageConfig *gcc,
GimpCageMode mode,
gint point_number)
{
GimpVector2 result = { 0.0, 0.0 };
GimpCagePoint *point;
g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), result);
g_return_val_if_fail (point_number < gcc->cage_points->len, result);
g_return_val_if_fail (point_number >= 0, result);
point = &g_array_index (gcc->cage_points, GimpCagePoint, point_number);
if (point->selected)
{
if (mode == GIMP_CAGE_MODE_CAGE_CHANGE)
{
result.x = point->src_point.x + gcc->displacement_x;
result.y = point->src_point.y + gcc->displacement_y;
}
else
{
result.x = point->dest_point.x + gcc->displacement_x;
result.y = point->dest_point.y + gcc->displacement_y;
}
}
else
{
if (mode == GIMP_CAGE_MODE_CAGE_CHANGE)
{
result.x = point->src_point.x;
result.y = point->src_point.y;
}
else
{
result.x = point->dest_point.x;
result.y = point->dest_point.y;
}
}
return result;
}
/**
* gimp_cage_config_add_displacement:
* @gcc: the cage config
* @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
* @point_number: the point of the cage to move
* @x: x displacement value
* @y: y displacement value
*
* Add a displacement for all slected point of the cage.
* This displacement need to be committed to become effective.
*/
void
gimp_cage_config_add_displacement (GimpCageConfig *gcc,
GimpCageMode mode,
gdouble x,
gdouble y)
{
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
gcc->cage_mode = mode;
gcc->displacement_x = x;
gcc->displacement_y = y;
#ifdef DEBUG_CAGE
print_cage (gcc);
#endif
}
/**
* gimp_cage_config_commit_displacement:
* @gcc: the cage config
*
* Apply the displacement to the cage
*/
void
gimp_cage_config_commit_displacement (GimpCageConfig *gcc)
{
gint i;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
for (i = 0; i < gcc->cage_points->len; i++)
{
GimpCagePoint *point;
point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
if (point->selected)
{
if (gcc->cage_mode == GIMP_CAGE_MODE_CAGE_CHANGE)
{
point->src_point.x += gcc->displacement_x;
point->src_point.y += gcc->displacement_y;
point->dest_point.x += gcc->displacement_x;
point->dest_point.y += gcc->displacement_y;
}
else
{
point->dest_point.x += gcc->displacement_x;
point->dest_point.y += gcc->displacement_y;
}
}
}
gimp_cage_config_compute_scaling_factor (gcc);
gimp_cage_config_compute_edges_normal (gcc);
gimp_cage_config_reset_displacement (gcc);
}
/**
* gimp_cage_config_reset_displacement:
* @gcc: the cage config
*
* Set the displacement to zero.
*/
void
gimp_cage_config_reset_displacement (GimpCageConfig *gcc)
{
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
gcc->displacement_x = 0.0;
gcc->displacement_y = 0.0;
}
/**
* gimp_cage_config_get_bounding_box:
* @gcc: the cage config
*
* Compute the bounding box of the source cage
*
* Returns: the bounding box of the source cage, as a GeglRectangle
*/
GeglRectangle
gimp_cage_config_get_bounding_box (GimpCageConfig *gcc)
{
GeglRectangle bounding_box = { 0, 0, 0, 0};
gint i;
GimpCagePoint *point;
g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), bounding_box);
g_return_val_if_fail (gcc->cage_points->len >= 0, bounding_box);
if (gcc->cage_points->len == 0)
return bounding_box;
point = &g_array_index (gcc->cage_points, GimpCagePoint, 0);
if (point->selected)
{
bounding_box.x = point->src_point.x + gcc->displacement_x;
bounding_box.y = point->src_point.y + gcc->displacement_y;
}
else
{
bounding_box.x = point->src_point.x;
bounding_box.y = point->src_point.y;
}
for (i = 1; i < gcc->cage_points->len; i++)
{
gdouble x,y;
point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
if (point->selected)
{
x = point->src_point.x + gcc->displacement_x;
y = point->src_point.y + gcc->displacement_y;
}
else
{
x = point->src_point.x;
y = point->src_point.y;
}
if (x < bounding_box.x)
{
bounding_box.width += bounding_box.x - x;
bounding_box.x = x;
}
if (y < bounding_box.y)
{
bounding_box.height += bounding_box.y - y;
bounding_box.y = y;
}
if (x > bounding_box.x + bounding_box.width)
{
bounding_box.width = x - bounding_box.x;
}
if (y > bounding_box.y + bounding_box.height)
{
bounding_box.height = y - bounding_box.y;
}
}
return bounding_box;
}
/**
* gimp_cage_config_reverse_cage:
* @gcc: the cage config
*
* When using non-simple cage (like a cage in 8), user may want to
* manually inverse inside and outside of the cage. This function
* reverse the cage
*/
void
gimp_cage_config_reverse_cage (GimpCageConfig *gcc)
{
GimpCagePoint temp;
gint i;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
for (i = 0; i < gcc->cage_points->len / 2; i++)
{
temp = g_array_index (gcc->cage_points, GimpCagePoint, i);
g_array_index (gcc->cage_points, GimpCagePoint, i) =
g_array_index (gcc->cage_points, GimpCagePoint, gcc->cage_points->len - i - 1);
g_array_index (gcc->cage_points, GimpCagePoint, gcc->cage_points->len - i - 1) = temp;
}
gimp_cage_config_compute_scaling_factor (gcc);
gimp_cage_config_compute_edges_normal (gcc);
}
/**
* gimp_cage_config_reverse_cage_if_needed:
* @gcc: the cage config
*
* Since the cage need to be defined counter-clockwise to have the
* topological inside in the actual 'physical' inside of the cage,
* this function compute if the cage is clockwise or not, and reverse
* the cage if needed.
*
* This function does not take into account an eventual displacement
*/
void
gimp_cage_config_reverse_cage_if_needed (GimpCageConfig *gcc)
{
gint i;
gdouble sum;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
sum = 0.0;
/* this is a bit crappy, but should works most of the case */
/* we do the sum of the projection of each point to the previous
segment, and see the final sign */
for (i = 0; i < gcc->cage_points->len ; i++)
{
GimpVector2 P1, P2, P3;
gdouble z;
P1 = (g_array_index (gcc->cage_points, GimpCagePoint, i)).src_point;
P2 = (g_array_index (gcc->cage_points, GimpCagePoint, (i+1) % gcc->cage_points->len)).src_point;
P3 = (g_array_index (gcc->cage_points, GimpCagePoint, (i+2) % gcc->cage_points->len)).src_point;
z = P1.x * (P2.y - P3.y) + P2.x * (P3.y - P1.y) + P3.x * (P1.y - P2.y);
sum += z;
}
/* sum > 0 mean a cage defined counter-clockwise, so we reverse it */
if (sum > 0)
{
gimp_cage_config_reverse_cage (gcc);
}
}
/**
* gimp_cage_config_compute_scaling_factor:
* @gcc: the cage config
*
* Update Green Coordinate scaling factor for the destination cage.
* This function does not take into account an eventual displacement.
*/
static void
gimp_cage_config_compute_scaling_factor (GimpCageConfig *gcc)
{
GimpVector2 edge;
gdouble length, length_d;
gint i;
GimpCagePoint *current, *last;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
if (gcc->cage_points->len < 2)
return;
last = &g_array_index (gcc->cage_points, GimpCagePoint, 0);
for (i = 1; i <= gcc->cage_points->len; i++)
{
current = &g_array_index (gcc->cage_points, GimpCagePoint, i % gcc->cage_points->len);
gimp_vector2_sub (&edge,
&(last->src_point),
&(current->src_point));
length = gimp_vector2_length (&edge);
gimp_vector2_sub (&edge,
&(last->dest_point),
&(current->dest_point));
length_d = gimp_vector2_length (&edge);
last->edge_scaling_factor = length_d / length;
last = current;
}
}
/**
* gimp_cage_config_compute_edges_normal:
* @gcc: the cage config
*
* Update edges normal for the destination cage.
* This function does not take into account an eventual displacement.
*/
static void
gimp_cage_config_compute_edges_normal (GimpCageConfig *gcc)
{
GimpVector2 normal;
gint i;
GimpCagePoint *current, *last;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
last = &g_array_index (gcc->cage_points, GimpCagePoint, 0);
for (i = 1; i <= gcc->cage_points->len; i++)
{
current = &g_array_index (gcc->cage_points, GimpCagePoint, i % gcc->cage_points->len);
gimp_vector2_sub (&normal,
&(current->dest_point),
&(last->dest_point));
last->edge_normal = gimp_vector2_normal (&normal);
last = current;
}
}
/**
* gimp_cage_config_point_inside:
* @gcc: the cage config
* @x: x coordinate of the point to test
* @y: y coordinate of the point to test
*
* Check if the given point is inside the cage. This test is done in
* the regard of the topological inside of the source cage.
*
* Returns: TRUE if the point is inside, FALSE if not.
* This function does not take into account an eventual displacement.
*/
gboolean
gimp_cage_config_point_inside (GimpCageConfig *gcc,
gfloat x,
gfloat y)
{
GimpVector2 *last, *current;
gboolean inside = FALSE;
gint i;
g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), FALSE);
last = &((g_array_index (gcc->cage_points, GimpCagePoint, gcc->cage_points->len - 1)).src_point);
for (i = 0; i < gcc->cage_points->len; i++)
{
current = &((g_array_index (gcc->cage_points, GimpCagePoint, i)).src_point);
if ((((current->y <= y) && (y < last->y))
|| ((last->y <= y) && (y < current->y)))
&& (x < (last->x - current->x) * (y - current->y) / (last->y - current->y) + current->x))
{
inside = !inside;
}
last = current;
}
return inside;
}
/**
* gimp_cage_config_select_point:
* @gcc: the cage config
* @point_number: the index of the point to select
*
* Select the given point of the cage, and deselect the others.
*/
void
gimp_cage_config_select_point (GimpCageConfig *gcc,
gint point_number)
{
gint i;
GimpCagePoint *point;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
g_return_if_fail (point_number < gcc->cage_points->len);
g_return_if_fail (point_number >= 0);
for (i = 0; i < gcc->cage_points->len; i++)
{
point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
if (i == point_number)
{
point->selected = TRUE;
}
else
{
point->selected = FALSE;
}
}
}
/**
* gimp_cage_config_select_area:
* @gcc: the cage config
* @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
* @area: the area to select
*
* Select cage's point inside the given area and deselect others
*/
void
gimp_cage_config_select_area (GimpCageConfig *gcc,
GimpCageMode mode,
GeglRectangle area)
{
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
gimp_cage_config_deselect_points (gcc);
gimp_cage_config_select_add_area (gcc, mode, area);
}
/**
* gimp_cage_config_select_add_area:
* @gcc: the cage config
* @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
* @area: the area to select
*
* Select cage's point inside the given area. Already selected point stay selected.
*/
void
gimp_cage_config_select_add_area (GimpCageConfig *gcc,
GimpCageMode mode,
GeglRectangle area)
{
gint i;
GimpCagePoint *point;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
for (i = 0; i < gcc->cage_points->len; i++)
{
point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
if (mode == GIMP_CAGE_MODE_CAGE_CHANGE)
{
if (point->src_point.x >= area.x &&
point->src_point.x <= area.x + area.width &&
point->src_point.y >= area.y &&
point->src_point.y <= area.y + area.height)
{
point->selected = TRUE;
}
}
else
{
if (point->dest_point.x >= area.x &&
point->dest_point.x <= area.x + area.width &&
point->dest_point.y >= area.y &&
point->dest_point.y <= area.y + area.height)
{
point->selected = TRUE;
}
}
}
}
/**
* gimp_cage_config_toggle_point_selection:
* @gcc: the cage config
* @point_number: the index of the point to toggle selection
*
* Toggle the selection of the given cage point
*/
void
gimp_cage_config_toggle_point_selection (GimpCageConfig *gcc,
gint point_number)
{
GimpCagePoint *point;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
g_return_if_fail (point_number < gcc->cage_points->len);
g_return_if_fail (point_number >= 0);
point = &g_array_index (gcc->cage_points, GimpCagePoint, point_number);
point->selected = ! point->selected;
}
/**
* gimp_cage_deselect_points:
* @gcc: the cage config
*
* Deselect all cage points.
*/
void
gimp_cage_config_deselect_points (GimpCageConfig *gcc)
{
gint i;
g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
for (i = 0; i < gcc->cage_points->len; i++)
{
(g_array_index (gcc->cage_points, GimpCagePoint, i)).selected = FALSE;
}
}
/**
* gimp_cage_config_point_is_selected:
* @gcc: the cage config
* @point_number: the index of the point to test
*
* Returns: TRUE if the point is selected, FALSE otherwise.
*/
gboolean
gimp_cage_config_point_is_selected (GimpCageConfig *gcc,
gint point_number)
{
GimpCagePoint *point;
g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), FALSE);
g_return_val_if_fail (point_number < gcc->cage_points->len, FALSE);
g_return_val_if_fail (point_number >= 0, FALSE);
point = &(g_array_index (gcc->cage_points, GimpCagePoint, point_number));
return point->selected;
}
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