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Gimp/app/path/gimppath.c
Jehan 2821dbab58 app: add generic support for less destructive transform tools. 
This commit will make all transform tools run on a link layer cumulate
their transform matrix on top of the previous transform steps. It means
that as long as you don't edit the pixels another way (e.g. with a paint
tool), all your transformations will apply as a single transformation.

For instance it means that applying several transform tool steps on a
monitored link layer will be less destructive than applying the exact
same transformations on the exact same "normal" layer contents.
Even scaling an image to 1x1 then back to a big size will work very
fine!

Note nevertheless the following limitations in current implementation:

* The link layer with transformations will still show as a standard link
  layer. Nothing says it has transformation applied on it right now.
* To drop transformations applied on a link layer, you have to discard
  the link info, then monitor the link again. A specific action in the
  contextual menu could be worth it.
* This should work with all transform tools (scale, rotation, unified,
  perspective, 3D, even Warp…) but it won't work for the Flip tool, nor
  will it work for the Transform actions. I will need to implement
  GimpItem's rotate(), flip() and resize() methods next.
* The layer mask would still be destructively transformed (I have not
  made any tests with layer masks yet, but this should be done next
  too).
* I think that the "scaled-only" property is now meaningless. It is now
  being replaced by the presence of the GimpMatrix3. Nevertheless I have
  still not removed this property.
* The load/save code has not been redone yet to include all these
  changes.

The kind of caveats we'd have to know about (and which are not planned
for change, because it's just how it is):

* Any intermediate interpolation methods are dropped when cumulating
  transform steps. Only the last interpolation is stored. This is
  because anyway the interpolation is only there as the best algorithm
  where we visually see the less quality loss. Applying several
  transformations as a single matrix will always be visually better than
  applying several matrices (whatever the intermediate interpolation
  methods chosen).
* This only works with the "Adjust" clipping method (basically no
  clipping) because 2 transform steps with clipping won't produce the
  same result as the multiplied matrix with clipping. It means that
  applying a transform with clipping will downgrade your link layer to
  being a normal layer.
  The only issue I have with this is how to best convey that clipping is
  a major setting setting here, which disables our less-destructive
  abilities. Right now, people will just have to "know" it.
* Vector link layers in particular will have 2 levels of
  non/less-destructivity transforms. In particular any scaling (both
  through "Scale Image", "Scale Layers" and transform tools — since I
  added code to detect a matrix doing only scaling and optionally
  translation) done **first** will be completely non-destructive since
  we will simply reload the original vector source at the right
  dimensions. Any other kind of transforms will be appended through the
  cumulative matrix, as raster link layers. This also includes scaling
  done **after** other transforms, since we cannot easily move the
  scaling first (matrix multiplication is not commutative). This second
  level of scaling will therefore be *less* destructive, but still
  destructive.
  It is possible eventually to improve the whole thing if we add some
  day the ability to request loading a vector image with a transform
  matrix (it will then be up to each vector format plug-in to support
  this feature or not).

Note: it could be argued that this whole implementation could in fact be
moved over to base layers, since it would allow also less-destructivity
when applying multiple transformations in a row. We would only merge
results once we edit pixels more directly.
But I think that it's not a bad idea to experiment with this new code in
the link layer. Eventually I may likely move this to the parent
GimpLayer if no blocking issues are found.
2025-08-27 11:34:04 +02:00

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimppath.c
* Copyright (C) 2002 Simon Budig <simon@gimp.org>
*
* 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 "path-types.h"
#include "core/gimp.h"
#include "core/gimp-transform-utils.h"
#include "core/gimpbezierdesc.h"
#include "core/gimpchannel-select.h"
#include "core/gimpcontainer.h"
#include "core/gimpcontext.h"
#include "core/gimpdrawable-fill.h"
#include "core/gimpdrawable-stroke.h"
#include "core/gimperror.h"
#include "core/gimpimage.h"
#include "core/gimpimage-undo-push.h"
#include "core/gimpitemstack.h"
#include "core/gimppaintinfo.h"
#include "core/gimpstrokeoptions.h"
#include "paint/gimppaintcore-stroke.h"
#include "paint/gimppaintoptions.h"
#include "gimpanchor.h"
#include "gimppath.h"
#include "gimppath-preview.h"
#include "gimpstroke.h"
#include "gimpvectorlayer.h"
#include "gimpvectorlayeroptions.h"
#include "gimp-intl.h"
enum
{
FREEZE,
THAW,
LAST_SIGNAL
};
static void gimp_path_finalize (GObject *object);
static gint64 gimp_path_get_memsize (GimpObject *object,
gint64 *gui_size);
static gboolean gimp_path_is_attached (GimpItem *item);
static GimpItemTree * gimp_path_get_tree (GimpItem *item);
static gboolean gimp_path_bounds (GimpItem *item,
gdouble *x,
gdouble *y,
gdouble *width,
gdouble *height);
static GimpItem * gimp_path_duplicate (GimpItem *item,
GType new_type);
static void gimp_path_convert (GimpItem *item,
GimpImage *dest_image,
GType old_type);
static void gimp_path_translate (GimpItem *item,
gdouble offset_x,
gdouble offset_y,
gboolean push_undo);
static void gimp_path_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interp_type,
GimpProgress *progress);
static void gimp_path_resize (GimpItem *item,
GimpContext *context,
GimpFillType fill_type,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y);
static void gimp_path_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result);
static void gimp_path_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result);
static void gimp_path_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interp_type,
GimpTransformResize clip_result,
GimpProgress *progress,
gboolean push_undo);
static GimpTransformResize
gimp_path_get_clip (GimpItem *item,
GimpTransformResize clip_result);
static gboolean gimp_path_fill (GimpItem *item,
GimpDrawable *drawable,
GimpFillOptions *fill_options,
gboolean push_undo,
GimpProgress *progress,
GError **error);
static gboolean gimp_path_stroke (GimpItem *item,
GimpDrawable *drawable,
GimpStrokeOptions *stroke_options,
gboolean push_undo,
GimpProgress *progress,
GError **error);
static void gimp_path_to_selection (GimpItem *item,
GimpChannelOps op,
gboolean antialias,
gboolean feather,
gdouble feather_radius_x,
gdouble feather_radius_y);
static void gimp_path_real_freeze (GimpPath *path);
static void gimp_path_real_thaw (GimpPath *path);
static void gimp_path_real_stroke_add (GimpPath *path,
GimpStroke *stroke);
static void gimp_path_real_stroke_remove (GimpPath *path,
GimpStroke *stroke);
static GimpStroke * gimp_path_real_stroke_get (GimpPath *path,
const GimpCoords *coord);
static GimpStroke *gimp_path_real_stroke_get_next (GimpPath *path,
GimpStroke *prev);
static gdouble gimp_path_real_stroke_get_length (GimpPath *path,
GimpStroke *prev);
static GimpAnchor * gimp_path_real_anchor_get (GimpPath *path,
const GimpCoords *coord,
GimpStroke **ret_stroke);
static void gimp_path_real_anchor_delete (GimpPath *path,
GimpAnchor *anchor);
static gdouble gimp_path_real_get_length (GimpPath *path,
const GimpAnchor *start);
static gdouble gimp_path_real_get_distance (GimpPath *path,
const GimpCoords *coord);
static gint gimp_path_real_interpolate (GimpPath *path,
GimpStroke *stroke,
gdouble precision,
gint max_points,
GimpCoords *ret_coords);
static gboolean gimp_path_attached_to_vector_layer_rec
(GimpPath *path,
GList *layers);
static GimpBezierDesc * gimp_path_make_bezier (GimpPath *path);
static GimpBezierDesc * gimp_path_real_make_bezier (GimpPath *path);
G_DEFINE_TYPE (GimpPath, gimp_path, GIMP_TYPE_ITEM)
#define parent_class gimp_path_parent_class
static guint gimp_path_signals[LAST_SIGNAL] = { 0 };
static void
gimp_path_class_init (GimpPathClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
GimpItemClass *item_class = GIMP_ITEM_CLASS (klass);
gimp_path_signals[FREEZE] =
g_signal_new ("freeze",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GimpPathClass, freeze),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
gimp_path_signals[THAW] =
g_signal_new ("thaw",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPathClass, thaw),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
object_class->finalize = gimp_path_finalize;
gimp_object_class->get_memsize = gimp_path_get_memsize;
viewable_class->default_icon_name = "gimp-path";
viewable_class->default_name = _("Path");
viewable_class->get_new_preview = gimp_path_get_new_preview;
item_class->is_attached = gimp_path_is_attached;
item_class->get_tree = gimp_path_get_tree;
item_class->bounds = gimp_path_bounds;
item_class->duplicate = gimp_path_duplicate;
item_class->convert = gimp_path_convert;
item_class->translate = gimp_path_translate;
item_class->scale = gimp_path_scale;
item_class->resize = gimp_path_resize;
item_class->flip = gimp_path_flip;
item_class->rotate = gimp_path_rotate;
item_class->transform = gimp_path_transform;
item_class->get_clip = gimp_path_get_clip;
item_class->fill = gimp_path_fill;
item_class->stroke = gimp_path_stroke;
item_class->to_selection = gimp_path_to_selection;
item_class->rename_desc = C_("undo-type", "Rename Path");
item_class->translate_desc = C_("undo-type", "Move Path");
item_class->scale_desc = C_("undo-type", "Scale Path");
item_class->resize_desc = C_("undo-type", "Resize Path");
item_class->flip_desc = C_("undo-type", "Flip Path");
item_class->rotate_desc = C_("undo-type", "Rotate Path");
item_class->transform_desc = C_("undo-type", "Transform Path");
item_class->fill_desc = C_("undo-type", "Fill Path");
item_class->stroke_desc = C_("undo-type", "Stroke Path");
item_class->to_selection_desc = C_("undo-type", "Path to Selection");
item_class->reorder_desc = C_("undo-type", "Reorder Path");
item_class->raise_desc = C_("undo-type", "Raise Path");
item_class->raise_to_top_desc = C_("undo-type", "Raise Path to Top");
item_class->lower_desc = C_("undo-type", "Lower Path");
item_class->lower_to_bottom_desc = C_("undo-type", "Lower Path to Bottom");
item_class->raise_failed = _("Path cannot be raised higher.");
item_class->lower_failed = _("Path cannot be lowered more.");
klass->freeze = gimp_path_real_freeze;
klass->thaw = gimp_path_real_thaw;
klass->stroke_add = gimp_path_real_stroke_add;
klass->stroke_remove = gimp_path_real_stroke_remove;
klass->stroke_get = gimp_path_real_stroke_get;
klass->stroke_get_next = gimp_path_real_stroke_get_next;
klass->stroke_get_length = gimp_path_real_stroke_get_length;
klass->anchor_get = gimp_path_real_anchor_get;
klass->anchor_delete = gimp_path_real_anchor_delete;
klass->get_length = gimp_path_real_get_length;
klass->get_distance = gimp_path_real_get_distance;
klass->interpolate = gimp_path_real_interpolate;
klass->make_bezier = gimp_path_real_make_bezier;
}
static void
gimp_path_init (GimpPath *path)
{
gimp_item_set_visible (GIMP_ITEM (path), FALSE, FALSE);
path->strokes = g_queue_new ();
path->stroke_to_list = g_hash_table_new (g_direct_hash, g_direct_equal);
path->last_stroke_id = 0;
path->freeze_count = 0;
path->precision = 0.2;
path->bezier_desc = NULL;
path->bounds_valid = FALSE;
}
static void
gimp_path_finalize (GObject *object)
{
GimpPath *path = GIMP_PATH (object);
if (path->bezier_desc)
{
gimp_bezier_desc_free (path->bezier_desc);
path->bezier_desc = NULL;
}
if (path->strokes)
{
g_queue_free_full (path->strokes, (GDestroyNotify) g_object_unref);
path->strokes = NULL;
}
if (path->stroke_to_list)
{
g_hash_table_destroy (path->stroke_to_list);
path->stroke_to_list = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint64
gimp_path_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpPath *path;
GList *list;
gint64 memsize = 0;
path = GIMP_PATH (object);
for (list = path->strokes->head; list; list = g_list_next (list))
memsize += (gimp_object_get_memsize (GIMP_OBJECT (list->data), gui_size) +
sizeof (GList));
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static gboolean
gimp_path_is_attached (GimpItem *item)
{
GimpImage *image = gimp_item_get_image (item);
return (GIMP_IS_IMAGE (image) &&
gimp_container_have (gimp_image_get_paths (image),
GIMP_OBJECT (item)));
}
static GimpItemTree *
gimp_path_get_tree (GimpItem *item)
{
if (gimp_item_is_attached (item))
{
GimpImage *image = gimp_item_get_image (item);
return gimp_image_get_path_tree (image);
}
return NULL;
}
static gboolean
gimp_path_bounds (GimpItem *item,
gdouble *x,
gdouble *y,
gdouble *width,
gdouble *height)
{
GimpPath *path = GIMP_PATH (item);
if (! path->bounds_valid)
{
GimpStroke *stroke;
path->bounds_empty = TRUE;
path->bounds_x1 = path->bounds_x2 = 0.0;
path->bounds_y1 = path->bounds_y2 = 0.0;
for (stroke = gimp_path_stroke_get_next (path, NULL);
stroke;
stroke = gimp_path_stroke_get_next (path, stroke))
{
GArray *stroke_coords;
gboolean closed;
stroke_coords = gimp_stroke_interpolate (stroke, 1.0, &closed);
if (stroke_coords)
{
GimpCoords point;
gint i;
if (path->bounds_empty && stroke_coords->len > 0)
{
point = g_array_index (stroke_coords, GimpCoords, 0);
path->bounds_x1 = path->bounds_x2 = point.x;
path->bounds_y1 = path->bounds_y2 = point.y;
path->bounds_empty = FALSE;
}
for (i = 0; i < stroke_coords->len; i++)
{
point = g_array_index (stroke_coords, GimpCoords, i);
path->bounds_x1 = MIN (path->bounds_x1, point.x);
path->bounds_y1 = MIN (path->bounds_y1, point.y);
path->bounds_x2 = MAX (path->bounds_x2, point.x);
path->bounds_y2 = MAX (path->bounds_y2, point.y);
}
g_array_free (stroke_coords, TRUE);
}
}
path->bounds_valid = TRUE;
}
*x = path->bounds_x1;
*y = path->bounds_y1;
*width = path->bounds_x2 - path->bounds_x1;
*height = path->bounds_y2 - path->bounds_y1;
return ! path->bounds_empty;
}
static GimpItem *
gimp_path_duplicate (GimpItem *item,
GType new_type)
{
GimpItem *new_item;
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_PATH), NULL);
new_item = GIMP_ITEM_CLASS (parent_class)->duplicate (item, new_type);
if (GIMP_IS_PATH (new_item))
{
GimpPath *path = GIMP_PATH (item);
GimpPath *new_path = GIMP_PATH (new_item);
gimp_path_copy_strokes (path, new_path);
}
return new_item;
}
static void
gimp_path_convert (GimpItem *item,
GimpImage *dest_image,
GType old_type)
{
gimp_item_set_size (item,
gimp_image_get_width (dest_image),
gimp_image_get_height (dest_image));
GIMP_ITEM_CLASS (parent_class)->convert (item, dest_image, old_type);
}
static void
gimp_path_translate (GimpItem *item,
gdouble offset_x,
gdouble offset_y,
gboolean push_undo)
{
GimpPath *path = GIMP_PATH (item);
GList *list;
gimp_path_freeze (path);
if (push_undo)
gimp_image_undo_push_path_mod (gimp_item_get_image (item),
_("Move Path"),
path);
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_stroke_translate (stroke, offset_x, offset_y);
}
gimp_path_thaw (path);
}
static void
gimp_path_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation_type,
GimpProgress *progress)
{
GimpPath *path = GIMP_PATH (item);
GimpImage *image = gimp_item_get_image (item);
GList *list;
gimp_path_freeze (path);
if (gimp_item_is_attached (item))
gimp_image_undo_push_path_mod (image, NULL, path);
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_stroke_scale (stroke,
(gdouble) new_width / (gdouble) gimp_item_get_width (item),
(gdouble) new_height / (gdouble) gimp_item_get_height (item));
gimp_stroke_translate (stroke, new_offset_x, new_offset_y);
}
GIMP_ITEM_CLASS (parent_class)->scale (item,
gimp_image_get_width (image),
gimp_image_get_height (image),
0, 0,
interpolation_type, progress);
gimp_path_thaw (path);
}
static void
gimp_path_resize (GimpItem *item,
GimpContext *context,
GimpFillType fill_type,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
GimpPath *path = GIMP_PATH (item);
GimpImage *image = gimp_item_get_image (item);
GList *list;
gimp_path_freeze (path);
if (gimp_item_is_attached (item))
gimp_image_undo_push_path_mod (image, NULL, path);
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_stroke_translate (stroke, offset_x, offset_y);
}
GIMP_ITEM_CLASS (parent_class)->resize (item, context, fill_type,
gimp_image_get_width (image),
gimp_image_get_height (image),
0, 0);
gimp_path_thaw (path);
}
static void
gimp_path_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
GimpPath *path = GIMP_PATH (item);
GList *list;
GimpMatrix3 matrix;
gimp_matrix3_identity (&matrix);
gimp_transform_matrix_flip (&matrix, flip_type, axis);
gimp_path_freeze (path);
gimp_image_undo_push_path_mod (gimp_item_get_image (item),
_("Flip Path"),
path);
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_stroke_transform (stroke, &matrix, NULL);
}
gimp_path_thaw (path);
}
static void
gimp_path_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
GimpPath *path = GIMP_PATH (item);
GList *list;
GimpMatrix3 matrix;
gimp_matrix3_identity (&matrix);
gimp_transform_matrix_rotate (&matrix, rotate_type, center_x, center_y);
gimp_path_freeze (path);
gimp_image_undo_push_path_mod (gimp_item_get_image (item),
_("Rotate Path"),
path);
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_stroke_transform (stroke, &matrix, NULL);
}
gimp_path_thaw (path);
}
static void
gimp_path_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
GimpTransformResize clip_result,
GimpProgress *progress,
gboolean push_undo)
{
GimpPath *path = GIMP_PATH (item);
GimpMatrix3 local_matrix;
GQueue strokes;
GList *list;
gimp_path_freeze (path);
if (push_undo)
gimp_image_undo_push_path_mod (gimp_item_get_image (item),
_("Transform Path"),
path);
local_matrix = *matrix;
if (direction == GIMP_TRANSFORM_BACKWARD)
gimp_matrix3_invert (&local_matrix);
g_queue_init (&strokes);
while (! g_queue_is_empty (path->strokes))
{
GimpStroke *stroke = g_queue_peek_head (path->strokes);
g_object_ref (stroke);
gimp_path_stroke_remove (path, stroke);
gimp_stroke_transform (stroke, &local_matrix, &strokes);
g_object_unref (stroke);
}
path->last_stroke_id = 0;
for (list = strokes.head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_path_stroke_add (path, stroke);
g_object_unref (stroke);
}
g_queue_clear (&strokes);
gimp_path_thaw (path);
}
static GimpTransformResize
gimp_path_get_clip (GimpItem *item,
GimpTransformResize clip_result)
{
return GIMP_TRANSFORM_RESIZE_ADJUST;
}
static gboolean
gimp_path_fill (GimpItem *item,
GimpDrawable *drawable,
GimpFillOptions *fill_options,
gboolean push_undo,
GimpProgress *progress,
GError **error)
{
GimpPath *path = GIMP_PATH (item);
if (g_queue_is_empty (path->strokes))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Not enough points to fill"));
return FALSE;
}
return gimp_drawable_fill_path (drawable, fill_options,
path, push_undo, error);
}
static gboolean
gimp_path_stroke (GimpItem *item,
GimpDrawable *drawable,
GimpStrokeOptions *stroke_options,
gboolean push_undo,
GimpProgress *progress,
GError **error)
{
GimpPath *path = GIMP_PATH (item);
gboolean retval = FALSE;
if (g_queue_is_empty (path->strokes))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Not enough points to stroke"));
return FALSE;
}
switch (gimp_stroke_options_get_method (stroke_options))
{
case GIMP_STROKE_LINE:
retval = gimp_drawable_stroke_path (drawable, stroke_options,
path, push_undo, error);
break;
case GIMP_STROKE_PAINT_METHOD:
{
GimpPaintInfo *paint_info;
GimpPaintCore *core;
GimpPaintOptions *paint_options;
gboolean emulate_dynamics;
paint_info = gimp_context_get_paint_info (GIMP_CONTEXT (stroke_options));
core = g_object_new (paint_info->paint_type, NULL);
paint_options = gimp_stroke_options_get_paint_options (stroke_options);
emulate_dynamics = gimp_stroke_options_get_emulate_dynamics (stroke_options);
retval = gimp_paint_core_stroke_path (core, drawable,
paint_options,
emulate_dynamics,
path, push_undo, error);
g_object_unref (core);
}
break;
default:
g_return_val_if_reached (FALSE);
}
return retval;
}
static void
gimp_path_to_selection (GimpItem *item,
GimpChannelOps op,
gboolean antialias,
gboolean feather,
gdouble feather_radius_x,
gdouble feather_radius_y)
{
GimpPath *path = GIMP_PATH (item);
GimpImage *image = gimp_item_get_image (item);
gimp_channel_select_path (gimp_image_get_mask (image),
GIMP_ITEM_GET_CLASS (item)->to_selection_desc,
path,
op, antialias,
feather, feather_radius_x, feather_radius_x,
TRUE);
}
static void
gimp_path_real_freeze (GimpPath *path)
{
/* release cached bezier representation */
if (path->bezier_desc)
{
gimp_bezier_desc_free (path->bezier_desc);
path->bezier_desc = NULL;
}
/* invalidate bounds */
path->bounds_valid = FALSE;
}
static void
gimp_path_real_thaw (GimpPath *path)
{
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (path));
}
/* public functions */
GimpPath *
gimp_path_new (GimpImage *image,
const gchar *name)
{
GimpPath *path;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
path = GIMP_PATH (gimp_item_new (GIMP_TYPE_PATH,
image, name,
0, 0,
gimp_image_get_width (image),
gimp_image_get_height (image)));
return path;
}
GimpPath *
gimp_path_get_parent (GimpPath *path)
{
g_return_val_if_fail (GIMP_IS_PATH (path), NULL);
return GIMP_PATH (gimp_viewable_get_parent (GIMP_VIEWABLE (path)));
}
void
gimp_path_freeze (GimpPath *path)
{
g_return_if_fail (GIMP_IS_PATH (path));
path->freeze_count++;
if (path->freeze_count == 1)
g_signal_emit (path, gimp_path_signals[FREEZE], 0);
}
void
gimp_path_thaw (GimpPath *path)
{
g_return_if_fail (GIMP_IS_PATH (path));
g_return_if_fail (path->freeze_count > 0);
path->freeze_count--;
if (path->freeze_count == 0)
g_signal_emit (path, gimp_path_signals[THAW], 0);
}
void
gimp_path_copy_strokes (GimpPath *src_path,
GimpPath *dest_path)
{
g_return_if_fail (GIMP_IS_PATH (src_path));
g_return_if_fail (GIMP_IS_PATH (dest_path));
gimp_path_freeze (dest_path);
g_queue_free_full (dest_path->strokes, (GDestroyNotify) g_object_unref);
dest_path->strokes = g_queue_new ();
g_hash_table_remove_all (dest_path->stroke_to_list);
dest_path->last_stroke_id = 0;
gimp_path_add_strokes (src_path, dest_path);
gimp_path_thaw (dest_path);
}
void
gimp_path_add_strokes (GimpPath *src_path,
GimpPath *dest_path)
{
GList *stroke;
g_return_if_fail (GIMP_IS_PATH (src_path));
g_return_if_fail (GIMP_IS_PATH (dest_path));
gimp_path_freeze (dest_path);
for (stroke = src_path->strokes->head;
stroke != NULL;
stroke = g_list_next (stroke))
{
GimpStroke *newstroke = gimp_stroke_duplicate (stroke->data);
g_queue_push_tail (dest_path->strokes, newstroke);
/* Also add to {stroke: GList node} map */
g_hash_table_insert (dest_path->stroke_to_list,
newstroke,
g_queue_peek_tail_link (dest_path->strokes));
dest_path->last_stroke_id++;
gimp_stroke_set_id (newstroke,
dest_path->last_stroke_id);
}
gimp_path_thaw (dest_path);
}
void
gimp_path_stroke_add (GimpPath *path,
GimpStroke *stroke)
{
g_return_if_fail (GIMP_IS_PATH (path));
g_return_if_fail (GIMP_IS_STROKE (stroke));
gimp_path_freeze (path);
GIMP_PATH_GET_CLASS (path)->stroke_add (path, stroke);
gimp_path_thaw (path);
}
static void
gimp_path_real_stroke_add (GimpPath *path,
GimpStroke *stroke)
{
/*
* Don't prepend into path->strokes. See ChangeLog 2003-05-21
* --Mitch
*/
g_queue_push_tail (path->strokes, g_object_ref (stroke));
/* Also add to {stroke: GList node} map */
g_hash_table_insert (path->stroke_to_list,
stroke,
g_queue_peek_tail_link (path->strokes));
path->last_stroke_id++;
gimp_stroke_set_id (stroke, path->last_stroke_id);
}
void
gimp_path_stroke_remove (GimpPath *path,
GimpStroke *stroke)
{
g_return_if_fail (GIMP_IS_PATH (path));
g_return_if_fail (GIMP_IS_STROKE (stroke));
gimp_path_freeze (path);
GIMP_PATH_GET_CLASS (path)->stroke_remove (path, stroke);
gimp_path_thaw (path);
}
static void
gimp_path_real_stroke_remove (GimpPath *path,
GimpStroke *stroke)
{
GList *list = g_hash_table_lookup (path->stroke_to_list, stroke);
if (list)
{
g_queue_delete_link (path->strokes, list);
g_hash_table_remove (path->stroke_to_list, stroke);
g_object_unref (stroke);
}
}
gint
gimp_path_get_n_strokes (GimpPath *path)
{
g_return_val_if_fail (GIMP_IS_PATH (path), 0);
return g_queue_get_length (path->strokes);
}
GimpStroke *
gimp_path_stroke_get (GimpPath *path,
const GimpCoords *coord)
{
g_return_val_if_fail (GIMP_IS_PATH (path), NULL);
return GIMP_PATH_GET_CLASS (path)->stroke_get (path, coord);
}
static GimpStroke *
gimp_path_real_stroke_get (GimpPath *path,
const GimpCoords *coord)
{
GimpStroke *minstroke = NULL;
gdouble mindist = G_MAXDOUBLE;
GList *list;
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
GimpAnchor *anchor = gimp_stroke_anchor_get (stroke, coord);
if (anchor)
{
gdouble dx = coord->x - anchor->position.x;
gdouble dy = coord->y - anchor->position.y;
if (mindist > dx * dx + dy * dy)
{
mindist = dx * dx + dy * dy;
minstroke = stroke;
}
}
}
return minstroke;
}
GimpStroke *
gimp_path_stroke_get_by_id (GimpPath *path,
gint id)
{
GList *list;
g_return_val_if_fail (GIMP_IS_PATH (path), NULL);
for (list = path->strokes->head; list; list = g_list_next (list))
{
if (gimp_stroke_get_id (list->data) == id)
return list->data;
}
return NULL;
}
GimpStroke *
gimp_path_stroke_get_next (GimpPath *path,
GimpStroke *prev)
{
g_return_val_if_fail (GIMP_IS_PATH (path), NULL);
return GIMP_PATH_GET_CLASS (path)->stroke_get_next (path, prev);
}
static GimpStroke *
gimp_path_real_stroke_get_next (GimpPath *path,
GimpStroke *prev)
{
if (! prev)
{
return g_queue_peek_head (path->strokes);
}
else
{
GList *stroke = g_hash_table_lookup (path->stroke_to_list, prev);
g_return_val_if_fail (stroke != NULL, NULL);
return stroke->next ? stroke->next->data : NULL;
}
}
gdouble
gimp_path_stroke_get_length (GimpPath *path,
GimpStroke *stroke)
{
g_return_val_if_fail (GIMP_IS_PATH (path), 0.0);
g_return_val_if_fail (GIMP_IS_STROKE (stroke), 0.0);
return GIMP_PATH_GET_CLASS (path)->stroke_get_length (path, stroke);
}
static gdouble
gimp_path_real_stroke_get_length (GimpPath *path,
GimpStroke *stroke)
{
g_return_val_if_fail (GIMP_IS_PATH (path), 0.0);
g_return_val_if_fail (GIMP_IS_STROKE (stroke), 0.0);
return gimp_stroke_get_length (stroke, path->precision);
}
GimpAnchor *
gimp_path_anchor_get (GimpPath *path,
const GimpCoords *coord,
GimpStroke **ret_stroke)
{
g_return_val_if_fail (GIMP_IS_PATH (path), NULL);
return GIMP_PATH_GET_CLASS (path)->anchor_get (path, coord,
ret_stroke);
}
static GimpAnchor *
gimp_path_real_anchor_get (GimpPath *path,
const GimpCoords *coord,
GimpStroke **ret_stroke)
{
GimpAnchor *minanchor = NULL;
gdouble mindist = -1;
GList *list;
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
GimpAnchor *anchor = gimp_stroke_anchor_get (stroke, coord);
if (anchor)
{
gdouble dx = coord->x - anchor->position.x;
gdouble dy = coord->y - anchor->position.y;
if (mindist > dx * dx + dy * dy || mindist < 0)
{
mindist = dx * dx + dy * dy;
minanchor = anchor;
if (ret_stroke)
*ret_stroke = stroke;
}
}
}
return minanchor;
}
void
gimp_path_anchor_delete (GimpPath *path,
GimpAnchor *anchor)
{
g_return_if_fail (GIMP_IS_PATH (path));
g_return_if_fail (anchor != NULL);
GIMP_PATH_GET_CLASS (path)->anchor_delete (path, anchor);
}
static void
gimp_path_real_anchor_delete (GimpPath *path,
GimpAnchor *anchor)
{
}
void
gimp_path_anchor_select (GimpPath *path,
GimpStroke *target_stroke,
GimpAnchor *anchor,
gboolean selected,
gboolean exclusive)
{
GList *list;
for (list = path->strokes->head; list; list = g_list_next (list))
{
GimpStroke *stroke = list->data;
gimp_stroke_anchor_select (stroke,
stroke == target_stroke ? anchor : NULL,
selected, exclusive);
}
}
gdouble
gimp_path_get_length (GimpPath *path,
const GimpAnchor *start)
{
g_return_val_if_fail (GIMP_IS_PATH (path), 0.0);
return GIMP_PATH_GET_CLASS (path)->get_length (path, start);
}
static gdouble
gimp_path_real_get_length (GimpPath *path,
const GimpAnchor *start)
{
g_printerr ("gimp_path_get_length: default implementation\n");
return 0;
}
gdouble
gimp_path_get_distance (GimpPath *path,
const GimpCoords *coord)
{
g_return_val_if_fail (GIMP_IS_PATH (path), 0.0);
return GIMP_PATH_GET_CLASS (path)->get_distance (path, coord);
}
static gdouble
gimp_path_real_get_distance (GimpPath *path,
const GimpCoords *coord)
{
g_printerr ("gimp_path_get_distance: default implementation\n");
return 0;
}
gint
gimp_path_interpolate (GimpPath *path,
GimpStroke *stroke,
gdouble precision,
gint max_points,
GimpCoords *ret_coords)
{
g_return_val_if_fail (GIMP_IS_PATH (path), 0);
return GIMP_PATH_GET_CLASS (path)->interpolate (path, stroke,
precision, max_points,
ret_coords);
}
static gint
gimp_path_real_interpolate (GimpPath *path,
GimpStroke *stroke,
gdouble precision,
gint max_points,
GimpCoords *ret_coords)
{
g_printerr ("gimp_path_interpolate: default implementation\n");
return 0;
}
gboolean
gimp_path_attached_to_vector_layer (GimpPath *path,
GimpImage *image)
{
GList *layers;
GList *list;
g_return_val_if_fail (GIMP_IS_PATH (path), FALSE);
g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
layers = gimp_image_get_layer_iter (image);
for (list = layers; list; list = g_list_next (list))
{
if (GIMP_IS_VECTOR_LAYER (list->data))
{
GimpVectorLayer *vector_layer = GIMP_VECTOR_LAYER (list->data);
if (vector_layer->options &&
vector_layer->options->path &&
(path == vector_layer->options->path))
return TRUE;
}
if (gimp_viewable_get_children (GIMP_VIEWABLE (list->data)))
{
GimpContainer *container;
GList *iter2;
container = gimp_viewable_get_children (GIMP_VIEWABLE (list->data));
iter2 =
gimp_item_stack_get_item_iter (GIMP_ITEM_STACK (container));
if (gimp_path_attached_to_vector_layer_rec (path, iter2))
return TRUE;
}
}
return FALSE;
}
static gboolean
gimp_path_attached_to_vector_layer_rec (GimpPath *path,
GList *layers)
{
GList *list;
for (list = layers; list; list = g_list_next (list))
{
if (GIMP_IS_VECTOR_LAYER (list->data))
{
GimpVectorLayer *vector_layer = GIMP_VECTOR_LAYER (list->data);
if (vector_layer->options &&
vector_layer->options->path &&
(path == vector_layer->options->path))
return TRUE;
}
if (gimp_viewable_get_children (GIMP_VIEWABLE (list->data)))
{
GimpContainer *container;
GList *iter2;
container = gimp_viewable_get_children (GIMP_VIEWABLE (list->data));
iter2 =
gimp_item_stack_get_item_iter (GIMP_ITEM_STACK (container));
if (gimp_path_attached_to_vector_layer_rec (path, iter2))
return TRUE;
}
}
return FALSE;
}
const GimpBezierDesc *
gimp_path_get_bezier (GimpPath *path)
{
g_return_val_if_fail (GIMP_IS_PATH (path), NULL);
if (! path->bezier_desc)
{
path->bezier_desc = gimp_path_make_bezier (path);
}
return path->bezier_desc;
}
static GimpBezierDesc *
gimp_path_make_bezier (GimpPath *path)
{
return GIMP_PATH_GET_CLASS (path)->make_bezier (path);
}
static GimpBezierDesc *
gimp_path_real_make_bezier (GimpPath *path)
{
GimpStroke *stroke;
GArray *cmd_array;
GimpBezierDesc *ret_bezdesc = NULL;
cmd_array = g_array_new (FALSE, FALSE, sizeof (cairo_path_data_t));
for (stroke = gimp_path_stroke_get_next (path, NULL);
stroke;
stroke = gimp_path_stroke_get_next (path, stroke))
{
GimpBezierDesc *bezdesc = gimp_stroke_make_bezier (stroke);
if (bezdesc)
{
cmd_array = g_array_append_vals (cmd_array, bezdesc->data,
bezdesc->num_data);
gimp_bezier_desc_free (bezdesc);
}
}
if (cmd_array->len > 0)
ret_bezdesc = gimp_bezier_desc_new ((cairo_path_data_t *) cmd_array->data,
cmd_array->len);
g_array_free (cmd_array, FALSE);
return ret_bezdesc;
}
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