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Gimp/app/tools/gimptransformtool.c
Ell de8e81f81f app: in GimpTransformGridTool, allow simultaneous forward and backward transforms 
In GimpTransformGridTool, allow performing simultaneous forward
(normal) and backward (corrective) transforms, by having each
transform direction operate on an independent set of parameters.
In other words, whereas the transform-grid tools previously had a
single transform, which could be applied either normally or
correctively using the "direction" tool-option, they now have two
independent transforms, one applied normally and the other
applied correctively, which are toggled using the "direction"
option.  The overall transform is the combination of the backward
transform, followed by the forward transform.

Another way to think about it, is that the tool transforms a source
shape into a destination shape.  The source shape is defined by the
backward transform, and the destination shape is defined by the
forward transform.  Wherewas previously only one of these shapes
could be controlled (the other shape always being the item bounds),
it's now possible to control both shapes in a single transform.
The next commit will allow modifying both shapes simultaneously,
making this even more useful.

Note that since both transforms start off as the identity, using
only one of the transform directions has the same behavior as
before.
2019-02-04 16:48:12 -05:00

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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 "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-undo.h"
#include "core/gimpitem-linked.h"
#include "core/gimplayer.h"
#include "core/gimplayermask.h"
#include "core/gimpprogress.h"
#include "core/gimp-transform-resize.h"
#include "vectors/gimpvectors.h"
#include "display/gimpdisplay.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 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,
GimpItem *item,
GeglBuffer *orig_buffer,
gint orig_offset_x,
gint orig_offset_y,
GimpColorProfile **buffer_profile,
gint *new_offset_x,
gint *new_offset_y);
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)
{
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;
}
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,
GimpItem *active_item,
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 a
* normal drawable, or the selection
*/
/* always clip the selection and unfloated channels
* so they keep their size
*/
if (GIMP_IS_CHANNEL (active_item) &&
! babl_format_has_alpha (gegl_buffer_get_format (orig_buffer)))
clip = GIMP_TRANSFORM_RESIZE_CLIP;
ret = gimp_drawable_transform_buffer_affine (GIMP_DRAWABLE (active_item),
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
{
/* this happens for entire drawables, paths and layer groups */
if (gimp_item_get_linked (active_item))
{
gimp_item_linked_transform (active_item, context,
&tr_tool->transform,
direction,
options->interpolation,
clip,
progress);
}
else
{
/* always clip layer masks so they keep their size
*/
if (GIMP_IS_CHANNEL (active_item))
clip = GIMP_TRANSFORM_RESIZE_CLIP;
gimp_item_transform (active_item, context,
&tr_tool->transform,
direction,
options->interpolation,
clip,
progress);
}
}
if (progress)
gimp_progress_end (progress);
return ret;
}
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);
GimpItem *active_item;
gdouble max_ratio = 0.0;
active_item = gimp_transform_tool_get_active_item (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 *items;
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 &&
! gimp_viewable_get_children (GIMP_VIEWABLE (active_item)))
{
selection_empty = ! gimp_item_bounds (
GIMP_ITEM (gimp_image_get_mask (image)),
&selection_bounds.x, &selection_bounds.y,
&selection_bounds.width, &selection_bounds.height);
}
if (selection_empty && gimp_item_get_linked (active_item))
{
items = gimp_image_item_list_get_list (image,
GIMP_ITEM_TYPE_ALL,
GIMP_ITEM_SET_LINKED);
}
else
{
items = g_list_append (NULL, active_item);
}
for (iter = items; iter; iter = g_list_next (iter))
{
GimpItem *item = iter->data;
GimpTransformResize clip = options->clip;
GeglRectangle orig_bounds;
GeglRectangle new_bounds;
if (GIMP_IS_DRAWABLE (item))
{
if (selection_empty)
{
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);
}
else
{
orig_bounds = selection_bounds;
}
clip = gimp_drawable_transform_get_effective_clip (
GIMP_DRAWABLE (item), NULL, clip);
}
else
{
gimp_item_bounds (item,
&orig_bounds.x, &orig_bounds.y,
&orig_bounds.width, &orig_bounds.height);
clip = GIMP_TRANSFORM_RESIZE_ADJUST;
}
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)
{
max_ratio = MAX (max_ratio,
(gdouble) new_bounds.width /
(gdouble) gimp_image_get_width (image));
}
if (new_bounds.height > orig_bounds.height)
{
max_ratio = MAX (max_ratio,
(gdouble) new_bounds.height /
(gdouble) gimp_image_get_height (image));
}
}
g_list_free (items);
}
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);
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));
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;
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);
g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
{
GimpDrawable *drawable;
gint offset_x;
gint offset_y;
gint x, y;
gint width, height;
drawable = gimp_image_get_active_drawable (image);
gimp_item_get_offset (GIMP_ITEM (drawable), &offset_x, &offset_y);
non_empty = gimp_item_mask_intersect (GIMP_ITEM (drawable),
&x, &y, &width, &height);
tr_tool->x1 = x + offset_x;
tr_tool->y1 = y + offset_y;
tr_tool->x2 = x + width + offset_x;
tr_tool->y2 = y + height + offset_y;
}
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);
}
else
{
/* without selection, test the emptiness of the path bounds :
* if empty, use the canvas bounds
* else use the path bounds
*/
if (! gimp_item_bounds (GIMP_ITEM (gimp_image_get_active_vectors (image)),
&tr_tool->x1, &tr_tool->y1,
&tr_tool->x2, &tr_tool->y2))
{
tr_tool->x1 = 0;
tr_tool->y1 = 0;
tr_tool->x2 = gimp_image_get_width (image);
tr_tool->y2 = gimp_image_get_height (image);
}
}
tr_tool->x2 += tr_tool->x1;
tr_tool->y2 += tr_tool->y1;
}
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));
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);
}
GimpItem *
gimp_transform_tool_get_active_item (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTransformOptions *options;
GimpImage *image;
GimpItem *item = 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->item)
return tr_tool->item;
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
item = GIMP_ITEM (gimp_image_get_active_drawable (image));
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
item = GIMP_ITEM (gimp_image_get_mask (image));
if (gimp_channel_is_empty (GIMP_CHANNEL (item)))
item = NULL;
break;
case GIMP_TRANSFORM_TYPE_PATH:
item = GIMP_ITEM (gimp_image_get_active_vectors (image));
break;
}
return item;
}
GimpItem *
gimp_transform_tool_check_active_item (GimpTransformTool *tr_tool,
GimpDisplay *display,
GError **error)
{
GimpTransformOptions *options;
GimpItem *item;
const gchar *null_message = NULL;
const gchar *locked_message = NULL;
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);
item = gimp_transform_tool_get_active_item (tr_tool, display);
switch (options->type)
{
case GIMP_TRANSFORM_TYPE_LAYER:
null_message = _("There is no layer to transform.");
if (item)
{
if (gimp_item_is_content_locked (item))
locked_message = _("The active layer's pixels are locked.");
else if (gimp_item_is_position_locked (item))
locked_message = _("The active layer's position and size are locked.");
if (! gimp_item_is_visible (item) &&
item != tr_tool->item) /* see bug #759194 */
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("The active 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 the layer."));
return NULL;
}
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
null_message = _("There is no selection to transform.");
if (item)
{
/* cannot happen, so don't translate these messages */
if (gimp_item_is_content_locked (item))
locked_message = "The selection's pixels are locked.";
else if (gimp_item_is_position_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.");
if (item)
{
if (gimp_item_is_content_locked (item))
locked_message = _("The active path's strokes are locked.");
else if (gimp_item_is_position_locked (item))
locked_message = _("The active path's position is locked.");
else if (! gimp_vectors_get_n_strokes (GIMP_VECTORS (item)))
locked_message = _("The active path has no strokes.");
}
break;
}
if (! item)
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, null_message);
if (error)
gimp_widget_blink (options->type_box);
return NULL;
}
if (locked_message)
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, locked_message);
if (error)
gimp_tools_blink_lock_box (display->gimp, item);
return NULL;
}
return item;
}
gboolean
gimp_transform_tool_transform (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTool *tool;
GimpTransformOptions *options;
GimpContext *context;
GimpImage *image;
GimpItem *active_item;
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);
context = GIMP_CONTEXT (options);
image = gimp_display_get_image (display);
g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
active_item = gimp_transform_tool_check_active_item (tr_tool, display,
&error);
if (! active_item)
{
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_viewable_get_children (GIMP_VIEWABLE (active_item)) &&
! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
orig_buffer = gimp_drawable_transform_cut (GIMP_DRAWABLE (active_item),
context,
&orig_offset_x,
&orig_offset_y,
&new_layer);
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
orig_buffer = g_object_ref (gimp_drawable_get_buffer (GIMP_DRAWABLE (active_item)));
break;
case GIMP_TRANSFORM_TYPE_PATH:
break;
}
/* Send the request for the transformation to the tool...
*/
new_buffer = GIMP_TRANSFORM_TOOL_GET_CLASS (tr_tool)->transform (tr_tool,
active_item,
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 (active_item),
new_buffer, buffer_profile,
new_offset_x, new_offset_y,
new_layer);
g_object_unref (new_buffer);
}
break;
case GIMP_TRANSFORM_TYPE_SELECTION:
if (new_buffer)
{
gimp_channel_push_undo (GIMP_CHANNEL (active_item), NULL);
gimp_drawable_set_buffer (GIMP_DRAWABLE (active_item),
FALSE, NULL, new_buffer);
g_object_unref (new_buffer);
}
break;
case GIMP_TRANSFORM_TYPE_PATH:
/* 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);
return TRUE;
}
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