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-rw-r--r--app/operations/gimpoperationcagetransform.c603
1 files changed, 603 insertions, 0 deletions
diff --git a/app/operations/gimpoperationcagetransform.c b/app/operations/gimpoperationcagetransform.c
new file mode 100644
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+++ b/app/operations/gimpoperationcagetransform.c
@@ -0,0 +1,603 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpoperationcage.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 "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationcagetransform.h"
+#include "gimpcageconfig.h"
+
+#include "gimp-intl.h"
+
+enum
+{
+ PROP_0,
+ PROP_CONFIG,
+ PROP_FILL,
+};
+
+
+static void gimp_operation_cage_transform_finalize (GObject *object);
+static void gimp_operation_cage_transform_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_cage_transform_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_cage_transform_prepare (GeglOperation *operation);
+static gboolean gimp_operation_cage_transform_process (GeglOperation *operation,
+ GeglBuffer *in_buf,
+ GeglBuffer *aux_buf,
+ GeglBuffer *out_buf,
+ const GeglRectangle *roi,
+ gint level);
+static void gimp_operation_cage_transform_interpolate_source_coords_recurs
+ (GimpOperationCageTransform *oct,
+ GeglBuffer *out_buf,
+ const GeglRectangle *roi,
+ GimpVector2 p1_s,
+ GimpVector2 p1_d,
+ GimpVector2 p2_s,
+ GimpVector2 p2_d,
+ GimpVector2 p3_s,
+ GimpVector2 p3_d,
+ gint recursion_depth,
+ gfloat *coords);
+static GimpVector2 gimp_cage_transform_compute_destination (GimpCageConfig *config,
+ gfloat *coef,
+ GeglSampler *coef_sampler,
+ GimpVector2 coords);
+GeglRectangle gimp_operation_cage_transform_get_cached_region (GeglOperation *operation,
+ const GeglRectangle *roi);
+GeglRectangle gimp_operation_cage_transform_get_required_for_output (GeglOperation *operation,
+ const gchar *input_pad,
+ const GeglRectangle *roi);
+GeglRectangle gimp_operation_cage_transform_get_bounding_box (GeglOperation *operation);
+
+
+G_DEFINE_TYPE (GimpOperationCageTransform, gimp_operation_cage_transform,
+ GEGL_TYPE_OPERATION_COMPOSER)
+
+#define parent_class gimp_operation_cage_transform_parent_class
+
+
+static void
+gimp_operation_cage_transform_class_init (GimpOperationCageTransformClass *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 = gimp_operation_cage_transform_get_property;
+ object_class->set_property = gimp_operation_cage_transform_set_property;
+ object_class->finalize = gimp_operation_cage_transform_finalize;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:cage-transform",
+ "categories", "transform",
+ "description", _("Convert a set of coefficient buffer to a coordinate buffer for the GIMP cage tool"),
+ NULL);
+
+ operation_class->prepare = gimp_operation_cage_transform_prepare;
+
+ operation_class->get_required_for_output = gimp_operation_cage_transform_get_required_for_output;
+ operation_class->get_cached_region = gimp_operation_cage_transform_get_cached_region;
+ operation_class->get_bounding_box = gimp_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 = gimp_operation_cage_transform_process;
+
+ g_object_class_install_property (object_class, PROP_CONFIG,
+ g_param_spec_object ("config",
+ "Config",
+ "A GimpCageConfig object, that define the transformation",
+ GIMP_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
+gimp_operation_cage_transform_init (GimpOperationCageTransform *self)
+{
+ self->format_coords = babl_format_n(babl_type("float"), 2);
+}
+
+static void
+gimp_operation_cage_transform_finalize (GObject *object)
+{
+ GimpOperationCageTransform *self = GIMP_OPERATION_CAGE_TRANSFORM (object);
+
+ g_clear_object (&self->config);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_cage_transform_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationCageTransform *self = GIMP_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
+gimp_operation_cage_transform_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationCageTransform *self = GIMP_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
+gimp_operation_cage_transform_prepare (GeglOperation *operation)
+{
+ GimpOperationCageTransform *oct = GIMP_OPERATION_CAGE_TRANSFORM (operation);
+ GimpCageConfig *config = GIMP_CAGE_CONFIG (oct->config);
+
+ gegl_operation_set_format (operation, "input",
+ babl_format_n (babl_type ("float"),
+ 2 * gimp_cage_config_get_n_points (config)));
+ gegl_operation_set_format (operation, "output",
+ babl_format_n (babl_type ("float"), 2));
+}
+
+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;
+ GeglSampler *coef_sampler;
+ 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_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
+ 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->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 (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 + 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++)
+ {
+ 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, coef_sampler, p3_s);
+ p4_d = gimp_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 = gimp_cage_transform_compute_destination (config, coef, coef_sampler, p3_s);
+ p4_d = gimp_cage_transform_compute_destination (config, coef, coef_sampler, 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)
+ {
+ 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
+gimp_operation_cage_transform_interpolate_source_coords_recurs (GimpOperationCageTransform *oct,
+ GeglBuffer *out_buf,
+ const GeglRectangle *roi,
+ GimpVector2 p1_s,
+ GimpVector2 p1_d,
+ GimpVector2 p2_s,
+ GimpVector2 p2_d,
+ GimpVector2 p3_s,
+ GimpVector2 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 */
+ /*
+ * /\
+ * /__\
+ * /\ /\
+ * /__\/__\
+ *
+ */
+
+ GimpVector2 pm1_d, pm2_d, pm3_d;
+ GimpVector2 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;
+
+ gimp_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);
+
+ gimp_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);
+
+ gimp_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);
+
+ gimp_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 GimpVector2
+gimp_cage_transform_compute_destination (GimpCageConfig *config,
+ gfloat *coef,
+ GeglSampler *coef_sampler,
+ GimpVector2 coords)
+{
+ GimpVector2 result = {0, 0};
+ gint n_cage_vertices = gimp_cage_config_get_n_points (config);
+ gint i;
+ GimpCagePoint *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, GimpCagePoint, 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
+gimp_operation_cage_transform_get_cached_region (GeglOperation *operation,
+ const GeglRectangle *roi)
+{
+ GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
+ "input");
+
+ return result;
+}
+
+GeglRectangle
+gimp_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
+gimp_operation_cage_transform_get_bounding_box (GeglOperation *operation)
+{
+ GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
+ "input");
+
+ return result;
+}
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