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gimp/app/tools/gimpselectiontool.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimpchannel.h"
#include "core/gimperror.h"
#include "core/gimpimage.h"
#include "core/gimpimage-pick-item.h"
#include "core/gimpimage-undo.h"
#include "core/gimppickable.h"
#include "core/gimpundostack.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell-appearance.h"
#include "widgets/gimpwidgets-utils.h"
#include "gimpeditselectiontool.h"
#include "gimpselectiontool.h"
#include "gimpselectionoptions.h"
#include "gimptoolcontrol.h"
#include "gimptools-utils.h"
#include "gimp-intl.h"
static void gimp_selection_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display);
static void gimp_selection_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display);
static void gimp_selection_tool_oper_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display);
static void gimp_selection_tool_cursor_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display);
static void gimp_selection_tool_commit (GimpSelectionTool *sel_tool);
static void gimp_selection_tool_halt (GimpSelectionTool *sel_tool,
GimpDisplay *display);
static gboolean gimp_selection_tool_check (GimpSelectionTool *sel_tool,
GimpDisplay *display,
GError **error);
static void gimp_selection_tool_set_undo_ptr (GimpUndo **undo_ptr,
GimpUndo *undo);
G_DEFINE_TYPE (GimpSelectionTool, gimp_selection_tool, GIMP_TYPE_DRAW_TOOL)
#define parent_class gimp_selection_tool_parent_class
static void
gimp_selection_tool_class_init (GimpSelectionToolClass *klass)
{
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
tool_class->control = gimp_selection_tool_control;
tool_class->modifier_key = gimp_selection_tool_modifier_key;
tool_class->key_press = gimp_edit_selection_tool_key_press;
tool_class->oper_update = gimp_selection_tool_oper_update;
tool_class->cursor_update = gimp_selection_tool_cursor_update;
}
static void
gimp_selection_tool_init (GimpSelectionTool *selection_tool)
{
selection_tool->function = SELECTION_SELECT;
selection_tool->saved_operation = GIMP_CHANNEL_OP_REPLACE;
selection_tool->saved_show_selection = FALSE;
selection_tool->undo = NULL;
selection_tool->redo = NULL;
selection_tool->idle_id = 0;
selection_tool->allow_move = TRUE;
}
static void
gimp_selection_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display)
{
GimpSelectionTool *selection_tool = GIMP_SELECTION_TOOL (tool);
switch (action)
{
case GIMP_TOOL_ACTION_PAUSE:
case GIMP_TOOL_ACTION_RESUME:
break;
case GIMP_TOOL_ACTION_HALT:
gimp_selection_tool_halt (selection_tool, display);
break;
case GIMP_TOOL_ACTION_COMMIT:
gimp_selection_tool_commit (selection_tool);
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
}
static void
gimp_selection_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display)
{
GimpSelectionTool *selection_tool = GIMP_SELECTION_TOOL (tool);
GimpSelectionOptions *options = GIMP_SELECTION_TOOL_GET_OPTIONS (tool);
GdkModifierType extend_mask;
GdkModifierType modify_mask;
extend_mask = gimp_get_extend_selection_mask ();
modify_mask = gimp_get_modify_selection_mask ();
if (key == extend_mask ||
key == modify_mask ||
key == GDK_MOD1_MASK)
{
GimpChannelOps button_op = options->operation;
if (press)
{
if (key == (state & (extend_mask |
modify_mask |
GDK_MOD1_MASK)))
{
/* first modifier pressed */
selection_tool->saved_operation = options->operation;
}
}
else
{
if (! (state & (extend_mask |
modify_mask |
GDK_MOD1_MASK)))
{
/* last modifier released */
button_op = selection_tool->saved_operation;
}
}
if (state & GDK_MOD1_MASK)
{
/* if alt is down, pretend that neither
* shift nor control are down
*/
button_op = selection_tool->saved_operation;
}
else if (state & (extend_mask |
modify_mask))
{
/* else get the operation from the modifier state, but only
* if there is actually a modifier pressed, so we don't
* override the "last modifier released" assignment above
*/
button_op = gimp_modifiers_to_channel_op (state);
}
if (button_op != options->operation)
{
g_object_set (options, "operation", button_op, NULL);
}
}
}
static void
gimp_selection_tool_oper_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display)
{
GimpSelectionTool *selection_tool = GIMP_SELECTION_TOOL (tool);
GimpSelectionOptions *options = GIMP_SELECTION_TOOL_GET_OPTIONS (tool);
GimpImage *image;
GimpChannel *selection;
GimpDrawable *drawable;
GimpLayer *layer;
GimpLayer *floating_sel;
GdkModifierType extend_mask;
GdkModifierType modify_mask;
gboolean move_layer = FALSE;
gboolean move_floating_sel = FALSE;
gboolean selection_empty;
image = gimp_display_get_image (display);
selection = gimp_image_get_mask (image);
drawable = gimp_image_get_active_drawable (image);
layer = gimp_image_pick_layer (image, coords->x, coords->y, NULL);
floating_sel = gimp_image_get_floating_selection (image);
extend_mask = gimp_get_extend_selection_mask ();
modify_mask = gimp_get_modify_selection_mask ();
if (drawable)
{
if (floating_sel)
{
if (layer == floating_sel)
move_floating_sel = TRUE;
}
else if (gimp_item_mask_intersect (GIMP_ITEM (drawable),
NULL, NULL, NULL, NULL))
{
move_layer = TRUE;
}
}
selection_empty = gimp_channel_is_empty (selection);
selection_tool->function = SELECTION_SELECT;
if (selection_tool->allow_move &&
(state & GDK_MOD1_MASK) && (state & modify_mask) && move_layer)
{
/* move the selection */
selection_tool->function = SELECTION_MOVE;
}
else if (selection_tool->allow_move &&
(state & GDK_MOD1_MASK) && (state & extend_mask) && move_layer)
{
/* move a copy of the selection */
selection_tool->function = SELECTION_MOVE_COPY;
}
else if (selection_tool->allow_move &&
(state & GDK_MOD1_MASK) && ! selection_empty)
{
/* move the selection mask */
selection_tool->function = SELECTION_MOVE_MASK;
}
else if (selection_tool->allow_move &&
! (state & (extend_mask | modify_mask)) &&
move_floating_sel)
{
/* move the selection */
selection_tool->function = SELECTION_MOVE;
}
else if ((state & modify_mask) || (state & extend_mask))
{
/* select */
selection_tool->function = SELECTION_SELECT;
}
else if (floating_sel)
{
/* anchor the selection */
selection_tool->function = SELECTION_ANCHOR;
}
gimp_tool_pop_status (tool, display);
if (proximity)
{
const gchar *status = NULL;
gboolean free_status = FALSE;
GdkModifierType modifiers = (extend_mask | modify_mask);
if (! selection_empty)
modifiers |= GDK_MOD1_MASK;
switch (selection_tool->function)
{
case SELECTION_SELECT:
switch (options->operation)
{
case GIMP_CHANNEL_OP_REPLACE:
if (! selection_empty)
{
status = gimp_suggest_modifiers (_("Click-Drag to replace the "
"current selection"),
modifiers & ~state,
NULL, NULL, NULL);
free_status = TRUE;
}
else
{
status = _("Click-Drag to create a new selection");
}
break;
case GIMP_CHANNEL_OP_ADD:
status = gimp_suggest_modifiers (_("Click-Drag to add to the "
"current selection"),
modifiers
& ~(state | extend_mask),
NULL, NULL, NULL);
free_status = TRUE;
break;
case GIMP_CHANNEL_OP_SUBTRACT:
status = gimp_suggest_modifiers (_("Click-Drag to subtract from the "
"current selection"),
modifiers
& ~(state | modify_mask),
NULL, NULL, NULL);
free_status = TRUE;
break;
case GIMP_CHANNEL_OP_INTERSECT:
status = gimp_suggest_modifiers (_("Click-Drag to intersect with "
"the current selection"),
modifiers & ~state,
NULL, NULL, NULL);
free_status = TRUE;
break;
}
break;
case SELECTION_MOVE_MASK:
status = gimp_suggest_modifiers (_("Click-Drag to move the "
"selection mask"),
modifiers & ~state,
NULL, NULL, NULL);
free_status = TRUE;
break;
case SELECTION_MOVE:
status = _("Click-Drag to move the selected pixels");
break;
case SELECTION_MOVE_COPY:
status = _("Click-Drag to move a copy of the selected pixels");
break;
case SELECTION_ANCHOR:
status = _("Click to anchor the floating selection");
break;
default:
g_return_if_reached ();
}
if (status)
gimp_tool_push_status (tool, display, "%s", status);
if (free_status)
g_free ((gchar *) status);
}
}
static void
gimp_selection_tool_cursor_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display)
{
GimpSelectionTool *selection_tool = GIMP_SELECTION_TOOL (tool);
GimpSelectionOptions *options;
GimpToolCursorType tool_cursor;
GimpCursorModifier modifier;
options = GIMP_SELECTION_TOOL_GET_OPTIONS (tool);
tool_cursor = gimp_tool_control_get_tool_cursor (tool->control);
modifier = GIMP_CURSOR_MODIFIER_NONE;
switch (selection_tool->function)
{
case SELECTION_SELECT:
switch (options->operation)
{
case GIMP_CHANNEL_OP_REPLACE:
break;
case GIMP_CHANNEL_OP_ADD:
modifier = GIMP_CURSOR_MODIFIER_PLUS;
break;
case GIMP_CHANNEL_OP_SUBTRACT:
modifier = GIMP_CURSOR_MODIFIER_MINUS;
break;
case GIMP_CHANNEL_OP_INTERSECT:
modifier = GIMP_CURSOR_MODIFIER_INTERSECT;
break;
}
break;
case SELECTION_MOVE_MASK:
modifier = GIMP_CURSOR_MODIFIER_MOVE;
break;
case SELECTION_MOVE:
case SELECTION_MOVE_COPY:
tool_cursor = GIMP_TOOL_CURSOR_MOVE;
break;
case SELECTION_ANCHOR:
modifier = GIMP_CURSOR_MODIFIER_ANCHOR;
break;
}
/* our subclass might have set a BAD modifier, in which case we leave it
* there, since it's more important than what we have to say.
*/
if (gimp_tool_control_get_cursor_modifier (tool->control) ==
GIMP_CURSOR_MODIFIER_BAD ||
! gimp_selection_tool_check (selection_tool, display, NULL))
{
modifier = GIMP_CURSOR_MODIFIER_BAD;
}
gimp_tool_set_cursor (tool, display,
gimp_tool_control_get_cursor (tool->control),
tool_cursor,
modifier);
}
static void
gimp_selection_tool_commit (GimpSelectionTool *sel_tool)
{
/* make sure gimp_selection_tool_halt() doesn't undo the change, if any */
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, NULL);
}
static void
gimp_selection_tool_halt (GimpSelectionTool *sel_tool,
GimpDisplay *display)
{
g_warn_if_fail (sel_tool->change_count == 0);
if (display)
{
GimpTool *tool = GIMP_TOOL (sel_tool);
GimpImage *image = gimp_display_get_image (display);
GimpUndoStack *undo_stack = gimp_image_get_undo_stack (image);
GimpUndo *undo = gimp_undo_stack_peek (undo_stack);
/* if we have an existing selection in the current display, then
* we have already "executed", and need to undo at this point,
* unless the user has done something in the meantime
*/
if (undo && sel_tool->undo == undo)
{
/* prevent this change from halting the tool */
gimp_tool_control_push_preserve (tool->control, TRUE);
gimp_image_undo (image);
gimp_image_flush (image);
gimp_tool_control_pop_preserve (tool->control);
}
/* reset the automatic undo/redo mechanism */
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, NULL);
gimp_selection_tool_set_undo_ptr (&sel_tool->redo, NULL);
}
}
static gboolean
gimp_selection_tool_check (GimpSelectionTool *sel_tool,
GimpDisplay *display,
GError **error)
{
GimpSelectionOptions *options = GIMP_SELECTION_TOOL_GET_OPTIONS (sel_tool);
GimpImage *image = gimp_display_get_image (display);
GimpDrawable *drawable = gimp_image_get_active_drawable (image);
switch (sel_tool->function)
{
case SELECTION_SELECT:
switch (options->operation)
{
case GIMP_CHANNEL_OP_ADD:
case GIMP_CHANNEL_OP_REPLACE:
break;
case GIMP_CHANNEL_OP_SUBTRACT:
if (! gimp_item_bounds (GIMP_ITEM (gimp_image_get_mask (image)),
NULL, NULL, NULL, NULL))
{
g_set_error (error, GIMP_ERROR, GIMP_FAILED,
_("Cannot subtract from an empty selection."));
return FALSE;
}
break;
case GIMP_CHANNEL_OP_INTERSECT:
if (! gimp_item_bounds (GIMP_ITEM (gimp_image_get_mask (image)),
NULL, NULL, NULL, NULL))
{
g_set_error (error, GIMP_ERROR, GIMP_FAILED,
_("Cannot intersect with an empty selection."));
return FALSE;
}
break;
}
break;
case SELECTION_MOVE:
case SELECTION_MOVE_COPY:
if (gimp_viewable_get_children (GIMP_VIEWABLE (drawable)))
{
g_set_error (error, GIMP_ERROR, GIMP_FAILED,
_("Cannot modify the pixels of layer groups."));
return FALSE;
}
else if (gimp_item_is_content_locked (GIMP_ITEM (drawable)))
{
g_set_error (error, GIMP_ERROR, GIMP_FAILED,
_("The active layer's pixels are locked."));
if (error)
gimp_tools_blink_lock_box (display->gimp, GIMP_ITEM (drawable));
return FALSE;
}
break;
default:
break;
}
return TRUE;
}
static void
gimp_selection_tool_set_undo_ptr (GimpUndo **undo_ptr,
GimpUndo *undo)
{
if (*undo_ptr)
{
g_object_remove_weak_pointer (G_OBJECT (*undo_ptr),
(gpointer *) undo_ptr);
}
*undo_ptr = undo;
if (*undo_ptr)
{
g_object_add_weak_pointer (G_OBJECT (*undo_ptr),
(gpointer *) undo_ptr);
}
}
/* public functions */
gboolean
gimp_selection_tool_start_edit (GimpSelectionTool *sel_tool,
GimpDisplay *display,
const GimpCoords *coords)
{
GimpTool *tool;
GimpSelectionOptions *options;
GError *error = NULL;
g_return_val_if_fail (GIMP_IS_SELECTION_TOOL (sel_tool), FALSE);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), FALSE);
g_return_val_if_fail (coords != NULL, FALSE);
tool = GIMP_TOOL (sel_tool);
options = GIMP_SELECTION_TOOL_GET_OPTIONS (sel_tool);
g_return_val_if_fail (gimp_tool_control_is_active (tool->control) == FALSE,
FALSE);
if (! gimp_selection_tool_check (sel_tool, display, &error))
{
gimp_tool_message_literal (tool, display, error->message);
gimp_widget_blink (options->mode_box);
g_clear_error (&error);
return TRUE;
}
switch (sel_tool->function)
{
case SELECTION_MOVE_MASK:
gimp_edit_selection_tool_start (tool, display, coords,
GIMP_TRANSLATE_MODE_MASK, FALSE);
return TRUE;
case SELECTION_MOVE:
case SELECTION_MOVE_COPY:
{
GimpTranslateMode edit_mode;
gimp_tool_control (tool, GIMP_TOOL_ACTION_COMMIT, display);
if (sel_tool->function == SELECTION_MOVE)
edit_mode = GIMP_TRANSLATE_MODE_MASK_TO_LAYER;
else
edit_mode = GIMP_TRANSLATE_MODE_MASK_COPY_TO_LAYER;
gimp_edit_selection_tool_start (tool, display, coords,
edit_mode, FALSE);
return TRUE;
}
default:
break;
}
return FALSE;
}
static gboolean
gimp_selection_tool_idle (GimpSelectionTool *sel_tool)
{
GimpTool *tool = GIMP_TOOL (sel_tool);
GimpDisplayShell *shell = gimp_display_get_shell (tool->display);
gimp_display_shell_set_show_selection (shell, FALSE);
sel_tool->idle_id = 0;
return G_SOURCE_REMOVE;
}
void
gimp_selection_tool_start_change (GimpSelectionTool *sel_tool,
gboolean create,
GimpChannelOps operation)
{
GimpTool *tool;
GimpDisplayShell *shell;
GimpImage *image;
GimpUndoStack *undo_stack;
g_return_if_fail (GIMP_IS_SELECTION_TOOL (sel_tool));
tool = GIMP_TOOL (sel_tool);
g_return_if_fail (tool->display != NULL);
if (sel_tool->change_count++ > 0)
return;
shell = gimp_display_get_shell (tool->display);
image = gimp_display_get_image (tool->display);
undo_stack = gimp_image_get_undo_stack (image);
sel_tool->saved_show_selection =
gimp_display_shell_get_show_selection (shell);
if (create)
{
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, NULL);
}
else
{
GimpUndoStack *redo_stack = gimp_image_get_redo_stack (image);
GimpUndo *undo;
undo = gimp_undo_stack_peek (undo_stack);
if (undo && undo == sel_tool->undo)
{
/* prevent this change from halting the tool */
gimp_tool_control_push_preserve (tool->control, TRUE);
gimp_image_undo (image);
gimp_tool_control_pop_preserve (tool->control);
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, NULL);
/* we will need to redo if the user cancels or executes */
gimp_selection_tool_set_undo_ptr (
&sel_tool->redo,
gimp_undo_stack_peek (redo_stack));
}
/* if the operation is "Replace", turn off the marching ants,
* because they are confusing ...
*/
if (operation == GIMP_CHANNEL_OP_REPLACE)
{
/* ... however, do this in an idle function, to avoid unnecessarily
* restarting the selection if we don't visit the main loop between
* the start_change() and end_change() calls.
*/
sel_tool->idle_id = g_idle_add_full (
G_PRIORITY_HIGH_IDLE,
(GSourceFunc) gimp_selection_tool_idle,
sel_tool, NULL);
}
}
gimp_selection_tool_set_undo_ptr (
&sel_tool->undo,
gimp_undo_stack_peek (undo_stack));
}
void
gimp_selection_tool_end_change (GimpSelectionTool *sel_tool,
gboolean cancel)
{
GimpTool *tool;
GimpDisplayShell *shell;
GimpImage *image;
GimpUndoStack *undo_stack;
g_return_if_fail (GIMP_IS_SELECTION_TOOL (sel_tool));
g_return_if_fail (sel_tool->change_count > 0);
tool = GIMP_TOOL (sel_tool);
g_return_if_fail (tool->display != NULL);
if (--sel_tool->change_count > 0)
return;
shell = gimp_display_get_shell (tool->display);
image = gimp_display_get_image (tool->display);
undo_stack = gimp_image_get_undo_stack (image);
if (cancel)
{
GimpUndoStack *redo_stack = gimp_image_get_redo_stack (image);
GimpUndo *redo = gimp_undo_stack_peek (redo_stack);
if (redo && redo == sel_tool->redo)
{
/* prevent this from halting the tool */
gimp_tool_control_push_preserve (tool->control, TRUE);
gimp_image_redo (image);
gimp_tool_control_pop_preserve (tool->control);
gimp_selection_tool_set_undo_ptr (
&sel_tool->undo,
gimp_undo_stack_peek (undo_stack));
}
else
{
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, NULL);
}
}
else
{
GimpUndo *undo = gimp_undo_stack_peek (undo_stack);
/* save the undo that we got when executing, but only if
* we actually selected something
*/
if (undo && undo != sel_tool->undo)
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, undo);
else
gimp_selection_tool_set_undo_ptr (&sel_tool->undo, NULL);
}
gimp_selection_tool_set_undo_ptr (&sel_tool->redo, NULL);
if (sel_tool->idle_id)
{
g_source_remove (sel_tool->idle_id);
sel_tool->idle_id = 0;
}
else
{
gimp_display_shell_set_show_selection (shell,
sel_tool->saved_show_selection);
}
gimp_image_flush (image);
}
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