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gimp/app/tools/gimptransformtool.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) 1995-2001 Spencer Kimball, Peter Mattis, and others
*
* 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 <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "config/gimpguiconfig.h"
#include "core/gimp.h"
#include "core/gimpdrawable-transform.h"
#include "core/gimperror.h"
#include "core/gimpimage.h"
#include "core/gimpimage-item-list.h"
#include "core/gimpimage-transform.h"
#include "core/gimpimage-undo.h"
#include "core/gimplayer.h"
#include "core/gimplayermask.h"
#include "core/gimpprogress.h"
#include "core/gimp-transform-resize.h"
#include "path/gimppath.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "widgets/gimpmessagedialog.h"
#include "widgets/gimpmessagebox.h"
#include "widgets/gimpwidgets-utils.h"
#include "gimptoolcontrol.h"
#include "gimptools-utils.h"
#include "gimptransformoptions.h"
#include "gimptransformtool.h"
#include "gimp-intl.h"
/* the minimal ratio between the transformed item size and the image size,
* above which confirmation is required.
*/
#define MIN_CONFIRMATION_RATIO 10
/* local function prototypes */
static void gimp_transform_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display);
static gchar * gimp_transform_tool_real_get_undo_desc (GimpTransformTool *tr_tool);
static GimpTransformDirection gimp_transform_tool_real_get_direction (GimpTransformTool *tr_tool);
static GeglBuffer * gimp_transform_tool_real_transform (GimpTransformTool *tr_tool,
GList *objects,
GeglBuffer *orig_buffer,
gint orig_offset_x,
gint orig_offset_y,
GimpColorProfile **buffer_profile,
gint *new_offset_x,
gint *new_offset_y);
static void gimp_transform_tool_halt (GimpTransformTool *tr_tool);
static gboolean gimp_transform_tool_confirm (GimpTransformTool *tr_tool,
GimpDisplay *display);
G_DEFINE_TYPE (GimpTransformTool, gimp_transform_tool, GIMP_TYPE_DRAW_TOOL)
#define parent_class gimp_transform_tool_parent_class
/* private functions */
static void
gimp_transform_tool_class_init (GimpTransformToolClass *klass)
{
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
tool_class->control = gimp_transform_tool_control;
klass->recalc_matrix = NULL;
klass->get_undo_desc = gimp_transform_tool_real_get_undo_desc;
klass->get_direction = gimp_transform_tool_real_get_direction;
klass->transform = gimp_transform_tool_real_transform;
klass->undo_desc = _("Transform");
klass->progress_text = _("Transforming");
}
static void
gimp_transform_tool_init (GimpTransformTool *tr_tool)
{
gimp_matrix3_identity (&tr_tool->transform);
tr_tool->transform_valid = TRUE;
tr_tool->restore_type = FALSE;
}
static void
gimp_transform_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display)
{
GimpTransformTool *tr_tool = GIMP_TRANSFORM_TOOL (tool);
switch (action)
{
case GIMP_TOOL_ACTION_PAUSE:
case GIMP_TOOL_ACTION_RESUME:
break;
case GIMP_TOOL_ACTION_HALT:
gimp_transform_tool_halt (tr_tool);
break;
case GIMP_TOOL_ACTION_COMMIT:
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
}
static gchar *
gimp_transform_tool_real_get_undo_desc (GimpTransformTool *tr_tool)
{
return g_strdup (GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->undo_desc);
}
static GimpTransformDirection
gimp_transform_tool_real_get_direction (GimpTransformTool *tr_tool)
{
GimpTransformOptions *options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
return options->direction;
}
static GeglBuffer *
gimp_transform_tool_real_transform (GimpTransformTool *tr_tool,
GList *objects,
GeglBuffer *orig_buffer,
gint orig_offset_x,
gint orig_offset_y,
GimpColorProfile **buffer_profile,
gint *new_offset_x,
gint *new_offset_y)
{
GimpTransformToolClass *klass = GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool);
GimpTool *tool = GIMP_TOOL (tr_tool);
GimpTransformOptions *options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tool);
GimpContext *context = GIMP_CONTEXT (options);
GeglBuffer *ret = NULL;
GimpTransformResize clip = options->clip;
GimpTransformDirection direction;
GimpProgress *progress;
direction = GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->get_direction (tr_tool);
progress = gimp_progress_start (GIMP_PROGRESS (tool), FALSE,
"%s", klass->progress_text);
while (g_main_context_pending (NULL))
g_main_context_iteration (NULL, FALSE);
if (orig_buffer)
{
/* this happens when transforming a selection cut out of
* normal drawables.
*/
ret = gimp_drawable_transform_buffer_affine (objects->data,
context,
orig_buffer,
orig_offset_x,
orig_offset_y,
&tr_tool->transform,
direction,
options->interpolation,
clip,
buffer_profile,
new_offset_x,
new_offset_y,
progress);
}
else if (g_list_length (objects) == 1 && GIMP_IS_IMAGE (objects->data))
{
/* this happens for images */
gimp_image_transform (objects->data, context,
&tr_tool->transform,
direction,
options->interpolation,
clip,
progress);
}
else
{
GList *items;
/* this happens for entire drawables, paths and layer groups */
g_return_val_if_fail (g_list_length (objects) > 0, NULL);
items = gimp_image_item_list_filter (g_list_copy (objects));
gimp_image_item_list_transform (gimp_item_get_image (objects->data),
items, context,
&tr_tool->transform,
direction,
options->interpolation,
clip,
progress);
g_list_free (items);
}
if (progress)
gimp_progress_end (progress);
return ret;
}
static void
gimp_transform_tool_halt (GimpTransformTool *tr_tool)
{
GimpTransformOptions *options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
tr_tool->x1 = 0;
tr_tool->y1 = 0;
tr_tool->x2 = 0;
tr_tool->y2 = 0;
if (tr_tool->restore_type)
{
g_object_set (options,
"type", tr_tool->saved_type,
NULL);
tr_tool->restore_type = FALSE;
}
}
static gboolean
gimp_transform_tool_confirm (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTransformOptions *options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
GimpDisplayShell *shell = gimp_display_get_shell (display);
GimpImage *image = gimp_display_get_image (display);
GList *selected_objects;
gdouble max_ratio = 0.0;
GimpObject *max_ratio_object = NULL;
selected_objects = gimp_transform_tool_get_selected_objects (tr_tool, display);
if (GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->recalc_matrix)
{
GimpMatrix3 transform;
GimpTransformDirection direction;
GeglRectangle selection_bounds;
gboolean selection_empty = TRUE;
GList *objects = NULL;
GList *iter;
transform = tr_tool->transform;
direction = GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->get_direction (
tr_tool);
if (direction == GIMP_TRANSFORM_BACKWARD)
gimp_matrix3_invert (&transform);
if (options->type == GIMP_TRANSFORM_TYPE_LAYER)
{
for (iter = selected_objects; iter; iter = iter->next)
if (! gimp_viewable_get_children (GIMP_VIEWABLE (iter->data)))
{
if (gimp_item_bounds (GIMP_ITEM (gimp_image_get_mask (image)),
&selection_bounds.x, &selection_bounds.y,
&selection_bounds.width, &selection_bounds.height))
{
selection_empty = FALSE;
break;
}
}
}
if (selection_empty &&
selected_objects &&
GIMP_IS_ITEM (selected_objects->data))
{
objects = gimp_image_item_list_filter (g_list_copy (selected_objects));
g_list_free (selected_objects);
}
else
{
objects = selected_objects;
}
if (options->type == GIMP_TRANSFORM_TYPE_IMAGE)
{
objects = g_list_concat (
objects,
gimp_image_item_list_get_list (image,
GIMP_ITEM_TYPE_ALL,
GIMP_ITEM_SET_ALL));
}
for (iter = objects; iter; iter = g_list_next (iter))
{
GimpObject *object = iter->data;
GimpTransformResize clip = options->clip;
GeglRectangle orig_bounds;
GeglRectangle new_bounds;
gdouble ratio = 0.0;
if (GIMP_IS_DRAWABLE (object))
{
if (selection_empty)
{
GimpItem *item = GIMP_ITEM (object);
gimp_item_get_offset (item, &orig_bounds.x, &orig_bounds.y);
orig_bounds.width = gimp_item_get_width (item);
orig_bounds.height = gimp_item_get_height (item);
clip = gimp_item_get_clip (item, clip);
}
else
{
orig_bounds = selection_bounds;
}
}
else if (GIMP_IS_ITEM (object))
{
GimpItem *item = GIMP_ITEM (object);
gimp_item_bounds (item,
&orig_bounds.x, &orig_bounds.y,
&orig_bounds.width, &orig_bounds.height);
clip = gimp_item_get_clip (item, clip);
}
else
{
GimpImage *image;
g_return_val_if_fail (GIMP_IS_IMAGE (object), FALSE);
image = GIMP_IMAGE (object);
orig_bounds.x = 0;
orig_bounds.y = 0;
orig_bounds.width = gimp_image_get_width (image);
orig_bounds.height = gimp_image_get_height (image);
}
gimp_transform_resize_boundary (&transform, clip,
orig_bounds.x,
orig_bounds.y,
orig_bounds.x + orig_bounds.width,
orig_bounds.y + orig_bounds.height,
&new_bounds.x,
&new_bounds.y,
&new_bounds.width,
&new_bounds.height);
new_bounds.width -= new_bounds.x;
new_bounds.height -= new_bounds.y;
if (new_bounds.width > orig_bounds.width)
{
ratio = MAX (ratio,
(gdouble) new_bounds.width /
(gdouble) gimp_image_get_width (image));
}
if (new_bounds.height > orig_bounds.height)
{
ratio = MAX (ratio,
(gdouble) new_bounds.height /
(gdouble) gimp_image_get_height (image));
}
if (ratio > max_ratio)
{
max_ratio = ratio;
max_ratio_object = object;
}
}
g_list_free (objects);
}
if (max_ratio > MIN_CONFIRMATION_RATIO)
{
GtkWidget *dialog;
gint response;
dialog = gimp_message_dialog_new (_("Confirm Transformation"),
GIMP_ICON_DIALOG_WARNING,
GTK_WIDGET (shell),
GTK_DIALOG_MODAL |
GTK_DIALOG_DESTROY_WITH_PARENT,
gimp_standard_help_func, NULL,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_Transform"), GTK_RESPONSE_OK,
NULL);
gimp_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
if (GIMP_IS_ITEM (max_ratio_object))
{
gimp_message_box_set_primary_text (GIMP_MESSAGE_DIALOG (dialog)->box,
_("Transformation creates "
"a very large item."));
gimp_message_box_set_text (
GIMP_MESSAGE_DIALOG (dialog)->box,
_("Applying the transformation will result "
"in an item that is over %g times larger "
"than the image."),
floor (max_ratio));
}
else
{
gimp_message_box_set_primary_text (GIMP_MESSAGE_DIALOG (dialog)->box,
_("Transformation creates "
"a very large image."));
gimp_message_box_set_text (
GIMP_MESSAGE_DIALOG (dialog)->box,
_("Applying the transformation will enlarge "
"the image by a factor of %g."),
floor (max_ratio));
}
response = gtk_dialog_run (GTK_DIALOG (dialog));
gtk_widget_destroy (dialog);
if (response != GTK_RESPONSE_OK)
return FALSE;
}
return TRUE;
}
/* public functions */
gboolean
gimp_transform_tool_bounds (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTransformOptions *options;
GimpDisplayShell *shell;
GimpImage *image;
gboolean non_empty = TRUE;
g_return_val_if_fail (GIMP_IS_TRANSFORM_TOOL (tr_tool), FALSE);
options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
image = gimp_display_get_image (display);
shell = gimp_display_get_shell (display);
g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
{
GList *drawables;
GList *iter;
gint x = G_MAXINT;
gint y = G_MAXINT;
gint width = G_MININT;
gint height = G_MININT;
drawables = gimp_image_get_selected_drawables (image);
non_empty = FALSE;
for (iter = drawables; iter; iter = iter->next)
{
gint offset_x;
gint offset_y;
gint mask_off_x;
gint mask_off_y;
gint mask_width;
gint mask_height;
gboolean has_pixels;
gimp_item_get_offset (GIMP_ITEM (iter->data), &offset_x,
&offset_y);
/* This is the bounds relatively to the drawable. */
has_pixels = gimp_item_mask_intersect (GIMP_ITEM (iter->data),
&mask_off_x, &mask_off_y,
&mask_width, &mask_height);
if (has_pixels)
non_empty = TRUE;
/* The bounds relatively to the image. */
x = MIN (offset_x + mask_off_x, x);
y = MIN (offset_y + mask_off_y, y);
width = MAX (offset_x + mask_off_x + mask_width, width);
height = MAX (offset_y + mask_off_y + mask_height, height);
}
tr_tool->x1 = x;
tr_tool->y1 = y;
tr_tool->x2 = width;
tr_tool->y2 = height;
g_list_free (drawables);
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
{
gimp_item_bounds (GIMP_ITEM (gimp_image_get_mask (image)),
&tr_tool->x1, &tr_tool->y1,
&tr_tool->x2, &tr_tool->y2);
tr_tool->x2 += tr_tool->x1;
tr_tool->y2 += tr_tool->y1;
}
break;
case GIMP_TRANSFORM_TYPE_PATH:
{
GimpChannel *selection = gimp_image_get_mask (image);
/* if selection is not empty, use its bounds to perform the
* transformation of the path
*/
if (! gimp_channel_is_empty (selection))
{
gimp_item_bounds (GIMP_ITEM (selection),
&tr_tool->x1, &tr_tool->y1,
&tr_tool->x2, &tr_tool->y2);
tr_tool->x2 += tr_tool->x1;
tr_tool->y2 += tr_tool->y1;
}
else
{
GList *iter;
/* without selection, test the emptiness of the path bounds :
* if empty, use the canvas bounds
* else use the path bounds
*/
tr_tool->x1 = G_MAXINT;
tr_tool->y1 = G_MAXINT;
tr_tool->x2 = G_MININT;
tr_tool->y2 = G_MININT;
for (iter = gimp_image_get_selected_paths (image); iter; iter = iter->next)
{
GimpItem *item = iter->data;
gint x;
gint y;
gint width;
gint height;
if (gimp_item_bounds (item, &x, &y, &width, &height))
{
tr_tool->x1 = MIN (tr_tool->x1, x);
tr_tool->y1 = MIN (tr_tool->y1, y);
tr_tool->x2 = MAX (tr_tool->x2, x + width);
tr_tool->y2 = MAX (tr_tool->y2, y + height);
}
}
if (tr_tool->x2 <= tr_tool->x1 || tr_tool->y2 <= tr_tool->y1)
{
tr_tool->x1 = 0;
tr_tool->y1 = 0;
tr_tool->x2 = gimp_image_get_width (image);
tr_tool->y2 = gimp_image_get_height (image);
}
}
}
break;
case GIMP_TRANSFORM_TYPE_IMAGE:
if (! shell->show_all)
{
tr_tool->x1 = 0;
tr_tool->y1 = 0;
tr_tool->x2 = gimp_image_get_width (image);
tr_tool->y2 = gimp_image_get_height (image);
}
else
{
GeglRectangle bounding_box;
bounding_box = gimp_display_shell_get_bounding_box (shell);
tr_tool->x1 = bounding_box.x;
tr_tool->y1 = bounding_box.y;
tr_tool->x2 = bounding_box.x + bounding_box.width;
tr_tool->y2 = bounding_box.y + bounding_box.height;
}
break;
}
return non_empty;
}
void
gimp_transform_tool_recalc_matrix (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
g_return_if_fail (GIMP_IS_TRANSFORM_TOOL (tr_tool));
g_return_if_fail (GIMP_IS_DISPLAY (display));
if (tr_tool->x1 == tr_tool->x2 && tr_tool->y1 == tr_tool->y2)
gimp_transform_tool_bounds (tr_tool, display);
if (GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->recalc_matrix)
GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->recalc_matrix (tr_tool);
}
GList *
gimp_transform_tool_get_selected_objects (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTransformOptions *options;
GimpImage *image;
GList *objects = NULL;
g_return_val_if_fail (GIMP_IS_TRANSFORM_TOOL (tr_tool), NULL);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), NULL);
options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
image = gimp_display_get_image (display);
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
if (tr_tool->objects)
return g_list_copy (tr_tool->objects);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
objects = gimp_image_get_selected_drawables (image);
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
if (! gimp_channel_is_empty (gimp_image_get_mask (image)))
objects = g_list_prepend (NULL, gimp_image_get_mask (image));
break;
case GIMP_TRANSFORM_TYPE_PATH:
objects = g_list_copy (gimp_image_get_selected_paths (image));
break;
case GIMP_TRANSFORM_TYPE_IMAGE:
objects = g_list_prepend (NULL, image);
break;
}
return objects;
}
GList *
gimp_transform_tool_check_selected_objects (GimpTransformTool *tr_tool,
GimpDisplay *display,
GError **error)
{
GimpTransformOptions *options;
GList *objects;
GList *iter;
const gchar *null_message = NULL;
const gchar *locked_message = NULL;
GimpItem *locked_item = NULL;
GimpGuiConfig *config = GIMP_GUI_CONFIG (display->gimp->config);
g_return_val_if_fail (GIMP_IS_TRANSFORM_TOOL (tr_tool), NULL);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
objects = gimp_transform_tool_get_selected_objects (tr_tool, display);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
null_message = _("There is no layer to transform.");
for (iter = objects; iter; iter = iter->next)
{
GimpItem *item = iter->data;
if (gimp_item_is_content_locked (item, &locked_item))
locked_message = _("A selected layer's pixels are locked.");
else if (gimp_item_is_position_locked (item, &locked_item))
locked_message = _("A selected layer's position and size are locked.");
if (! gimp_item_is_visible (item) &&
! config->edit_non_visible &&
! g_list_find (tr_tool->objects, item)) /* see bug #759194 */
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("A selected layer is not visible."));
return NULL;
}
if (! gimp_transform_tool_bounds (tr_tool, display))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("The selection does not intersect with a selected layer."));
return NULL;
}
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
null_message = _("There is no selection to transform.");
for (iter = objects; iter; iter = iter->next)
{
GimpItem *item = iter->data;
/* cannot happen, so don't translate these messages */
if (gimp_item_is_content_locked (item, &locked_item))
locked_message = "The selection's pixels are locked.";
else if (gimp_item_is_position_locked (item, &locked_item))
locked_message = "The selection's position and size are locked.";
}
break;
case GIMP_TRANSFORM_TYPE_PATH:
null_message = _("There is no path to transform.");
for (iter = objects; iter; iter = iter->next)
{
GimpItem *item = iter->data;
if (gimp_item_is_content_locked (item, &locked_item))
locked_message = _("The selected path's strokes are locked.");
else if (gimp_item_is_position_locked (item, &locked_item))
locked_message = _("The selected path's position is locked.");
else if (! gimp_path_get_n_strokes (GIMP_PATH (item)))
locked_message = _("The selected path has no strokes.");
}
break;
case GIMP_TRANSFORM_TYPE_IMAGE:
/* cannot happen, so don't translate this message */
null_message = "There is no image to transform.";
break;
}
if (! objects)
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, null_message);
if (error)
{
gimp_tools_show_tool_options (display->gimp);
gimp_widget_blink (options->type_box);
}
return NULL;
}
if (locked_message)
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, locked_message);
if (error)
{
if (locked_item == NULL)
locked_item = GIMP_ITEM (objects->data);
gimp_tools_blink_lock_box (display->gimp, locked_item);
}
return NULL;
}
return objects;
}
gboolean
gimp_transform_tool_transform (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTool *tool;
GimpTransformOptions *options;
GimpImage *image;
GList *selected_objects;
GeglBuffer *orig_buffer = NULL;
gint orig_offset_x = 0;
gint orig_offset_y = 0;
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *buffer_profile;
gchar *undo_desc = NULL;
gboolean new_layer = FALSE;
GError *error = NULL;
g_return_val_if_fail (GIMP_IS_TRANSFORM_TOOL (tr_tool), FALSE);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), FALSE);
tool = GIMP_TOOL (tr_tool);
options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tool);
image = gimp_display_get_image (display);
g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
selected_objects = gimp_transform_tool_check_selected_objects (tr_tool, display,
&error);
if (! selected_objects)
{
gimp_tool_message_literal (tool, display, error->message);
g_clear_error (&error);
return FALSE;
}
gimp_transform_tool_recalc_matrix (tr_tool, display);
if (! tr_tool->transform_valid)
{
gimp_tool_message_literal (tool, display,
_("The current transform is invalid"));
return FALSE;
}
if (GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->recalc_matrix &&
gimp_matrix3_is_identity (&tr_tool->transform))
{
/* No need to commit an identity transformation! */
return TRUE;
}
if (! gimp_transform_tool_confirm (tr_tool, display))
return FALSE;
gimp_set_busy (display->gimp);
/* We're going to dirty this image, but we want to keep the tool around */
gimp_tool_control_push_preserve (tool->control, TRUE);
undo_desc = GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->get_undo_desc (tr_tool);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_TRANSFORM, undo_desc);
g_free (undo_desc);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
if (! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
orig_buffer = gimp_drawable_transform_cut (
selected_objects,
GIMP_CONTEXT (options),
&orig_offset_x,
&orig_offset_y,
&new_layer);
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
case GIMP_TRANSFORM_TYPE_PATH:
case GIMP_TRANSFORM_TYPE_IMAGE:
break;
}
/* Send the request for the transformation to the tool...
*/
new_buffer = GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->transform (
tr_tool,
selected_objects,
orig_buffer,
orig_offset_x,
orig_offset_y,
&buffer_profile,
&new_offset_x,
&new_offset_y);
if (orig_buffer)
g_object_unref (orig_buffer);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
if (new_buffer)
{
/* paste the new transformed image to the image...also implement
* undo...
*/
gimp_drawable_transform_paste (GIMP_DRAWABLE (selected_objects->data),
new_buffer, buffer_profile,
new_offset_x, new_offset_y,
new_layer, TRUE);
g_object_unref (new_buffer);
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
case GIMP_TRANSFORM_TYPE_PATH:
case GIMP_TRANSFORM_TYPE_IMAGE:
/* Nothing to be done */
break;
}
gimp_image_undo_group_end (image);
/* We're done dirtying the image, and would like to be restarted if
* the image gets dirty while the tool exists
*/
gimp_tool_control_pop_preserve (tool->control);
gimp_unset_busy (display->gimp);
gimp_image_flush (image);
g_list_free (selected_objects);
return TRUE;
}
void
gimp_transform_tool_set_type (GimpTransformTool *tr_tool,
GimpTransformType type)
{
GimpTransformOptions *options;
g_return_if_fail (GIMP_IS_TRANSFORM_TOOL (tr_tool));
options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
if (! tr_tool->restore_type)
tr_tool->saved_type = options->type;
tr_tool->restore_type = FALSE;
g_object_set (options,
"type", type,
NULL);
tr_tool->restore_type = TRUE;
}
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