PIKApp/app/operations/pikaoperationcagetransform.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
*
* pikaoperationcage.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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libpikacolor/pikacolor.h"
#include "libpikamath/pikamath.h"
#include "operations-types.h"
#include "pikaoperationcagetransform.h"
#include "pikacageconfig.h"
#include "pika-intl.h"
enum
{
PROP_0,
PROP_CONFIG,
PROP_FILL,
};
static void pika_operation_cage_transform_finalize (GObject *object);
static void pika_operation_cage_transform_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_operation_cage_transform_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_operation_cage_transform_prepare (GeglOperation *operation);
static gboolean pika_operation_cage_transform_process (GeglOperation *operation,
GeglBuffer *in_buf,
GeglBuffer *aux_buf,
GeglBuffer *out_buf,
const GeglRectangle *roi,
gint level);
static void pika_operation_cage_transform_interpolate_source_coords_recurs
(PikaOperationCageTransform *oct,
GeglBuffer *out_buf,
const GeglRectangle *roi,
PikaVector2 p1_s,
PikaVector2 p1_d,
PikaVector2 p2_s,
PikaVector2 p2_d,
PikaVector2 p3_s,
PikaVector2 p3_d,
gint recursion_depth,
gfloat *coords);
static PikaVector2 pika_cage_transform_compute_destination (PikaCageConfig *config,
gfloat *coef,
GeglSampler *coef_sampler,
PikaVector2 coords);
GeglRectangle pika_operation_cage_transform_get_cached_region (GeglOperation *operation,
const GeglRectangle *roi);
GeglRectangle pika_operation_cage_transform_get_required_for_output (GeglOperation *operation,
const gchar *input_pad,
const GeglRectangle *roi);
GeglRectangle pika_operation_cage_transform_get_bounding_box (GeglOperation *operation);
G_DEFINE_TYPE (PikaOperationCageTransform, pika_operation_cage_transform,
GEGL_TYPE_OPERATION_COMPOSER)
#define parent_class pika_operation_cage_transform_parent_class
static void
pika_operation_cage_transform_class_init (PikaOperationCageTransformClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GeglOperationComposerClass *filter_class = GEGL_OPERATION_COMPOSER_CLASS (klass);
object_class->get_property = pika_operation_cage_transform_get_property;
object_class->set_property = pika_operation_cage_transform_set_property;
object_class->finalize = pika_operation_cage_transform_finalize;
gegl_operation_class_set_keys (operation_class,
"name", "pika:cage-transform",
"categories", "transform",
"description", _("Convert a set of coefficient buffer to a coordinate buffer for the PIKA cage tool"),
NULL);
operation_class->prepare = pika_operation_cage_transform_prepare;
operation_class->get_required_for_output = pika_operation_cage_transform_get_required_for_output;
operation_class->get_cached_region = pika_operation_cage_transform_get_cached_region;
operation_class->get_bounding_box = pika_operation_cage_transform_get_bounding_box;
/* XXX Temporarily disable multi-threading on this operation because
* it is much faster when single-threaded. See bug 787663.
*/
operation_class->threaded = FALSE;
filter_class->process = pika_operation_cage_transform_process;
g_object_class_install_property (object_class, PROP_CONFIG,
g_param_spec_object ("config",
"Config",
"A PikaCageConfig object, that define the transformation",
PIKA_TYPE_CAGE_CONFIG,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_FILL,
g_param_spec_boolean ("fill-plain-color",
_("Fill with plain color"),
_("Fill the original position of the cage with a plain color"),
FALSE,
G_PARAM_READWRITE));
}
static void
pika_operation_cage_transform_init (PikaOperationCageTransform *self)
{
self->format_coords = babl_format_n(babl_type("float"), 2);
}
static void
pika_operation_cage_transform_finalize (GObject *object)
{
PikaOperationCageTransform *self = PIKA_OPERATION_CAGE_TRANSFORM (object);
g_clear_object (&self->config);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_operation_cage_transform_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaOperationCageTransform *self = PIKA_OPERATION_CAGE_TRANSFORM (object);
switch (property_id)
{
case PROP_CONFIG:
g_value_set_object (value, self->config);
break;
case PROP_FILL:
g_value_set_boolean (value, self->fill_plain_color);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_operation_cage_transform_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaOperationCageTransform *self = PIKA_OPERATION_CAGE_TRANSFORM (object);
switch (property_id)
{
case PROP_CONFIG:
if (self->config)
g_object_unref (self->config);
self->config = g_value_dup_object (value);
break;
case PROP_FILL:
self->fill_plain_color = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_operation_cage_transform_prepare (GeglOperation *operation)
{
PikaOperationCageTransform *oct = PIKA_OPERATION_CAGE_TRANSFORM (operation);
PikaCageConfig *config = PIKA_CAGE_CONFIG (oct->config);
gegl_operation_set_format (operation, "input",
babl_format_n (babl_type ("float"),
2 * pika_cage_config_get_n_points (config)));
gegl_operation_set_format (operation, "output",
babl_format_n (babl_type ("float"), 2));
}
static gboolean
pika_operation_cage_transform_process (GeglOperation *operation,
GeglBuffer *in_buf,
GeglBuffer *aux_buf,
GeglBuffer *out_buf,
const GeglRectangle *roi,
gint level)
{
PikaOperationCageTransform *oct = PIKA_OPERATION_CAGE_TRANSFORM (operation);
PikaCageConfig *config = PIKA_CAGE_CONFIG (oct->config);
GeglRectangle cage_bb;
gfloat *coords;
gfloat *coef;
const Babl *format_coef;
GeglSampler *coef_sampler;
PikaVector2 plain_color;
GeglBufferIterator *it;
gint x, y;
gboolean output_set;
PikaCagePoint *point;
guint n_cage_vertices;
/* pre-fill the out buffer with no-displacement coordinate */
it = gegl_buffer_iterator_new (out_buf, roi, 0, NULL,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
cage_bb = pika_cage_config_get_bounding_box (config);
point = &(g_array_index (config->cage_points, PikaCagePoint, 0));
plain_color.x = (gint) point->src_point.x;
plain_color.y = (gint) point->src_point.y;
n_cage_vertices = pika_cage_config_get_n_points (config);
while (gegl_buffer_iterator_next (it))
{
/* iterate inside the roi */
gint n_pixels = it->length;
gfloat *output = it->items[0].data;
x = it->items[0].roi.x; /* initial x */
y = it->items[0].roi.y; /* and y coordinates */
while (n_pixels--)
{
output_set = FALSE;
if (oct->fill_plain_color)
{
if (x > cage_bb.x &&
y > cage_bb.y &&
x < cage_bb.x + cage_bb.width &&
y < cage_bb.y + cage_bb.height)
{
if (pika_cage_config_point_inside (config, x, y))
{
output[0] = plain_color.x;
output[1] = plain_color.y;
output_set = TRUE;
}
}
}
if (!output_set)
{
output[0] = x + 0.5;
output[1] = y + 0.5;
}
output += 2;
/* update x and y coordinates */
x++;
if (x >= (it->items[0].roi.x + it->items[0].roi.width))
{
x = it->items[0].roi.x;
y++;
}
}
}
if (! aux_buf)
return TRUE;
gegl_operation_progress (operation, 0.0, "");
/* pre-allocate memory outside of the loop */
coords = g_slice_alloc (2 * sizeof (gfloat));
coef = g_malloc (n_cage_vertices * 2 * sizeof (gfloat));
format_coef = babl_format_n (babl_type ("float"), 2 * n_cage_vertices);
coef_sampler = gegl_buffer_sampler_new (aux_buf,
format_coef, GEGL_SAMPLER_NEAREST);
/* compute, reverse and interpolate the transformation */
for (y = cage_bb.y; y < cage_bb.y + cage_bb.height - 1; y++)
{
PikaVector2 p1_d, p2_d, p3_d, p4_d;
PikaVector2 p1_s, p2_s, p3_s, p4_s;
p1_s.y = y;
p2_s.y = y+1;
p3_s.y = y+1;
p3_s.x = cage_bb.x;
p4_s.y = y;
p4_s.x = cage_bb.x;
p3_d = pika_cage_transform_compute_destination (config, coef, coef_sampler, p3_s);
p4_d = pika_cage_transform_compute_destination (config, coef, coef_sampler, p4_s);
for (x = cage_bb.x; x < cage_bb.x + cage_bb.width - 1; x++)
{
p1_s = p4_s;
p2_s = p3_s;
p3_s.x = x+1;
p4_s.x = x+1;
p1_d = p4_d;
p2_d = p3_d;
p3_d = pika_cage_transform_compute_destination (config, coef, coef_sampler, p3_s);
p4_d = pika_cage_transform_compute_destination (config, coef, coef_sampler, p4_s);
if (pika_cage_config_point_inside (config, x, y))
{
pika_operation_cage_transform_interpolate_source_coords_recurs (oct,
out_buf,
roi,
p1_s, p1_d,
p2_s, p2_d,
p3_s, p3_d,
0,
coords);
pika_operation_cage_transform_interpolate_source_coords_recurs (oct,
out_buf,
roi,
p1_s, p1_d,
p3_s, p3_d,
p4_s, p4_d,
0,
coords);
}
}
if ((y - cage_bb.y) % 20 == 0)
{
gdouble fraction = ((gdouble) (y - cage_bb.y) /
(gdouble) (cage_bb.height));
/* 0.0 and 1.0 indicate progress start/end, so avoid them */
if (fraction > 0.0 && fraction < 1.0)
{
gegl_operation_progress (operation, fraction, "");
}
}
}
g_object_unref (coef_sampler);
g_free (coef);
g_slice_free1 (2 * sizeof (gfloat), coords);
gegl_operation_progress (operation, 1.0, "");
return TRUE;
}
static void
pika_operation_cage_transform_interpolate_source_coords_recurs (PikaOperationCageTransform *oct,
GeglBuffer *out_buf,
const GeglRectangle *roi,
PikaVector2 p1_s,
PikaVector2 p1_d,
PikaVector2 p2_s,
PikaVector2 p2_d,
PikaVector2 p3_s,
PikaVector2 p3_d,
gint recursion_depth,
gfloat *coords)
{
gint xmin, xmax, ymin, ymax, x, y;
/* Stop recursion if all 3 vertices of the triangle are outside the
* ROI (left/right or above/below).
*/
if (p1_d.x >= roi->x + roi->width &&
p2_d.x >= roi->x + roi->width &&
p3_d.x >= roi->x + roi->width) return;
if (p1_d.y >= roi->y + roi->height &&
p2_d.y >= roi->y + roi->height &&
p3_d.y >= roi->y + roi->height) return;
if (p1_d.x < roi->x &&
p2_d.x < roi->x &&
p3_d.x < roi->x) return;
if (p1_d.y < roi->y &&
p2_d.y < roi->y &&
p3_d.y < roi->y) return;
xmin = xmax = lrint (p1_d.x);
ymin = ymax = lrint (p1_d.y);
x = lrint (p2_d.x);
xmin = MIN (x, xmin);
xmax = MAX (x, xmax);
x = lrint (p3_d.x);
xmin = MIN (x, xmin);
xmax = MAX (x, xmax);
y = lrint (p2_d.y);
ymin = MIN (y, ymin);
ymax = MAX (y, ymax);
y = lrint (p3_d.y);
ymin = MIN (y, ymin);
ymax = MAX (y, ymax);
/* test if there is no more pixel in the triangle */
if (xmin == xmax || ymin == ymax)
return;
/* test if the triangle is implausibly large as manifested by too deep recursion */
if (recursion_depth > 5)
return;
/* test if the triangle is small enough.
*
* if yes, we compute the coefficient of the barycenter for the
* pixel (x,y) and see if a pixel is inside (ie the 3 coef have the
* same sign).
*/
if (xmax - xmin == 1 && ymax - ymin == 1)
{
gdouble a, b, c, denom, x, y;
x = (gdouble) xmin + 0.5;
y = (gdouble) ymin + 0.5;
denom = (p2_d.x - p1_d.x) * p3_d.y + (p1_d.x - p3_d.x) * p2_d.y + (p3_d.x - p2_d.x) * p1_d.y;
a = ((p2_d.x - x) * p3_d.y + (x - p3_d.x) * p2_d.y + (p3_d.x - p2_d.x) * y) / denom;
b = - ((p1_d.x - x) * p3_d.y + (x - p3_d.x) * p1_d.y + (p3_d.x - p1_d.x) * y) / denom;
c = 1.0 - a - b;
/* if a pixel is inside, we compute its source coordinate and
* set it in the output buffer
*/
if ((a > 0 && b > 0 && c > 0) || (a < 0 && b < 0 && c < 0))
{
GeglRectangle rect = { 0, 0, 1, 1 };
gfloat coords[2];
rect.x = xmin;
rect.y = ymin;
coords[0] = (a * p1_s.x + b * p2_s.x + c * p3_s.x);
coords[1] = (a * p1_s.y + b * p2_s.y + c * p3_s.y);
gegl_buffer_set (out_buf,
&rect,
0,
oct->format_coords,
coords,
GEGL_AUTO_ROWSTRIDE);
}
return;
}
else
{
/* we cut the triangle in 4 sub-triangle and treat it recursively */
/*
* /\
* /__\
* /\ /\
* /__\/__\
*
*/
PikaVector2 pm1_d, pm2_d, pm3_d;
PikaVector2 pm1_s, pm2_s, pm3_s;
gint next_depth = recursion_depth + 1;
pm1_d.x = (p1_d.x + p2_d.x) / 2.0;
pm1_d.y = (p1_d.y + p2_d.y) / 2.0;
pm2_d.x = (p2_d.x + p3_d.x) / 2.0;
pm2_d.y = (p2_d.y + p3_d.y) / 2.0;
pm3_d.x = (p3_d.x + p1_d.x) / 2.0;
pm3_d.y = (p3_d.y + p1_d.y) / 2.0;
pm1_s.x = (p1_s.x + p2_s.x) / 2.0;
pm1_s.y = (p1_s.y + p2_s.y) / 2.0;
pm2_s.x = (p2_s.x + p3_s.x) / 2.0;
pm2_s.y = (p2_s.y + p3_s.y) / 2.0;
pm3_s.x = (p3_s.x + p1_s.x) / 2.0;
pm3_s.y = (p3_s.y + p1_s.y) / 2.0;
pika_operation_cage_transform_interpolate_source_coords_recurs (oct,
out_buf,
roi,
p1_s, p1_d,
pm1_s, pm1_d,
pm3_s, pm3_d,
next_depth,
coords);
pika_operation_cage_transform_interpolate_source_coords_recurs (oct,
out_buf,
roi,
pm1_s, pm1_d,
p2_s, p2_d,
pm2_s, pm2_d,
next_depth,
coords);
pika_operation_cage_transform_interpolate_source_coords_recurs (oct,
out_buf,
roi,
pm1_s, pm1_d,
pm2_s, pm2_d,
pm3_s, pm3_d,
next_depth,
coords);
pika_operation_cage_transform_interpolate_source_coords_recurs (oct,
out_buf,
roi,
pm3_s, pm3_d,
pm2_s, pm2_d,
p3_s, p3_d,
next_depth,
coords);
}
}
static PikaVector2
pika_cage_transform_compute_destination (PikaCageConfig *config,
gfloat *coef,
GeglSampler *coef_sampler,
PikaVector2 coords)
{
PikaVector2 result = {0, 0};
gint n_cage_vertices = pika_cage_config_get_n_points (config);
gint i;
PikaCagePoint *point;
gegl_sampler_get (coef_sampler,
coords.x, coords.y, NULL, coef, GEGL_ABYSS_NONE);
for (i = 0; i < n_cage_vertices; i++)
{
point = &g_array_index (config->cage_points, PikaCagePoint, i);
result.x += coef[i] * point->dest_point.x;
result.y += coef[i] * point->dest_point.y;
result.x += coef[i + n_cage_vertices] * point->edge_scaling_factor * point->edge_normal.x;
result.y += coef[i + n_cage_vertices] * point->edge_scaling_factor * point->edge_normal.y;
}
return result;
}
GeglRectangle
pika_operation_cage_transform_get_cached_region (GeglOperation *operation,
const GeglRectangle *roi)
{
GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
"input");
return result;
}
GeglRectangle
pika_operation_cage_transform_get_required_for_output (GeglOperation *operation,
const gchar *input_pad,
const GeglRectangle *roi)
{
GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
"input");
return result;
}
GeglRectangle
pika_operation_cage_transform_get_bounding_box (GeglOperation *operation)
{
GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
"input");
return result;
}