static GeglRectangle
gimp_operation_cage_coef_calc_get_bounding_box (GeglOperation *operation)
{
GimpOperationCageCoefCalc *occc = GIMP_OPERATION_CAGE_COEF_CALC (operation);
GimpCageConfig *config = GIMP_CAGE_CONFIG (occc->config);
return gimp_cage_config_get_bounding_box (config);
}
static gboolean
gimp_operation_cage_transform_process (GeglOperation *operation,
GeglBuffer *in_buf,
GeglBuffer *aux_buf,
GeglBuffer *out_buf,
const GeglRectangle *roi,
gint level)
{
GimpOperationCageTransform *oct = GIMP_OPERATION_CAGE_TRANSFORM (operation);
GimpCageConfig *config = GIMP_CAGE_CONFIG (oct->config);
GeglRectangle cage_bb;
gfloat *coords;
gfloat *coef;
const Babl *format_coef;
GimpVector2 plain_color;
GeglBufferIterator *it;
gint x, y;
gboolean output_set;
GimpCagePoint *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_BUFFER_WRITE, GEGL_ABYSS_NONE);
cage_bb = gimp_cage_config_get_bounding_box (config);
point = &(g_array_index (config->cage_points, GimpCagePoint, 0));
plain_color.x = (gint) point->src_point.x;
plain_color.y = (gint) point->src_point.y;
n_cage_vertices = gimp_cage_config_get_n_points (config);
while (gegl_buffer_iterator_next (it))
{
/* iterate inside the roi */
gint n_pixels = it->length;
gfloat *output = it->data[0];
x = it->roi->x; /* initial x */
y = it->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 (gimp_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;
output[1] = y;
}
output += 2;
/* update x and y coordinates */
x++;
if (x >= (it->roi->x + it->roi->width))
{
x = it->roi->x;
y++;
}
}
}
oct->progress = 0.0;
g_object_notify (G_OBJECT (oct), "progress");
/* 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);
/* compute, reverse and interpolate the transformation */
for (y = cage_bb.y; y < cage_bb.y + cage_bb.height - 1; y++)
{
GimpVector2 p1_d, p2_d, p3_d, p4_d;
GimpVector2 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 = gimp_cage_transform_compute_destination (config, coef, format_coef, aux_buf, p3_s);
p4_d = gimp_cage_transform_compute_destination (config, coef, format_coef, aux_buf, 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 = gimp_cage_transform_compute_destination (config, coef, format_coef, aux_buf, p3_s);
p4_d = gimp_cage_transform_compute_destination (config, coef, format_coef, aux_buf, p4_s);
if (gimp_cage_config_point_inside (config, x, y))
{
gimp_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);
gimp_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)
{
oct->progress = fraction;
g_object_notify (G_OBJECT (oct), "progress");
}
}
}
g_free (coef);
g_slice_free1 (2 * sizeof (gfloat), coords);
oct->progress = 1.0;
g_object_notify (G_OBJECT (oct), "progress");
return TRUE;
}
