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gimp/app/rect_select.c

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/* The GIMP -- an 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include "gdk/gdkkeysyms.h"
#include "appenv.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "edit_selection.h"
#include "floating_sel.h"
#include "rect_select.h"
#include "rect_selectP.h"
#include "selection_options.h"
#include "cursorutil.h"
#include "libgimp/gimpunitmenu.h"
#include "libgimp/gimpintl.h"
#define STATUSBAR_SIZE 128
/* the rectangular selection tool options */
static SelectionOptions *rect_options = NULL;
/* in gimp, ellipses are rectangular, too ;) */
extern SelectionOptions *ellipse_options;
extern void ellipse_select (GimpImage *gimage,
gint x,
gint y,
gint w,
gint h,
SelectOps op,
gboolean antialias,
gboolean feather,
gdouble feather_radius);
static void selection_tool_update_op_state (RectSelect *rect_sel,
gint x,
gint y,
gint state,
GDisplay *gdisp);
/*************************************/
/* Rectangular selection apparatus */
void
rect_select (GimpImage *gimage,
gint x,
gint y,
gint w,
gint h,
SelectOps op,
gboolean feather,
gdouble feather_radius)
{
Channel *new_mask;
/* if applicable, replace the current selection */
if (op == SELECTION_REPLACE)
gimage_mask_clear (gimage);
else
gimage_mask_undo (gimage);
/* if feathering for rect, make a new mask with the
* rectangle and feather that with the old mask
*/
if (feather)
{
new_mask = channel_new_mask (gimage, gimage->width, gimage->height);
channel_combine_rect (new_mask, ADD, x, y, w, h);
channel_feather (new_mask, gimage_get_mask (gimage),
feather_radius,
feather_radius,
op, 0, 0);
channel_delete (new_mask);
}
else if (op == SELECTION_INTERSECT)
{
new_mask = channel_new_mask (gimage, gimage->width, gimage->height);
channel_combine_rect (new_mask, ADD, x, y, w, h);
channel_combine_mask (gimage_get_mask (gimage), new_mask, op, 0, 0);
channel_delete (new_mask);
}
else
channel_combine_rect (gimage_get_mask (gimage), op, x, y, w, h);
}
void
rect_select_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
RectSelect *rect_sel;
gchar select_mode[STATUSBAR_SIZE];
gint x, y;
GimpUnit unit = GIMP_UNIT_PIXEL;
gdouble unit_factor;
gdisp = (GDisplay *) gdisp_ptr;
rect_sel = (RectSelect *) tool->private;
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y, TRUE, 0);
rect_sel->x = x;
rect_sel->y = y;
switch (tool->type)
{
case RECT_SELECT:
rect_sel->fixed_size = rect_options->fixed_size;
rect_sel->fixed_width = rect_options->fixed_width;
rect_sel->fixed_height = rect_options->fixed_height;
unit = rect_options->fixed_unit;
break;
case ELLIPSE_SELECT:
rect_sel->fixed_size = ellipse_options->fixed_size;
rect_sel->fixed_width = ellipse_options->fixed_width;
rect_sel->fixed_height = ellipse_options->fixed_height;
unit = ellipse_options->fixed_unit;
break;
default:
break;
}
switch (unit)
{
case GIMP_UNIT_PIXEL:
break;
case GIMP_UNIT_PERCENT:
rect_sel->fixed_width =
gdisp->gimage->width * rect_sel->fixed_width / 100;
rect_sel->fixed_height =
gdisp->gimage->height * rect_sel->fixed_height / 100;
break;
default:
unit_factor = gimp_unit_get_factor (unit);
rect_sel->fixed_width =
rect_sel->fixed_width * gdisp->gimage->xresolution / unit_factor;
rect_sel->fixed_height =
rect_sel->fixed_height * gdisp->gimage->yresolution / unit_factor;
break;
}
rect_sel->fixed_width = MAX (1, rect_sel->fixed_width);
rect_sel->fixed_height = MAX (1, rect_sel->fixed_height);
rect_sel->w = 0;
rect_sel->h = 0;
rect_sel->center = FALSE;
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
tool->state = ACTIVE;
tool->gdisp_ptr = gdisp_ptr;
switch (rect_sel->op)
{
case SELECTION_MOVE_MASK:
init_edit_selection (tool, gdisp_ptr, bevent, EDIT_MASK_TRANSLATE);
return;
case SELECTION_MOVE:
init_edit_selection (tool, gdisp_ptr, bevent, EDIT_MASK_TO_LAYER_TRANSLATE);
return;
default:
break;
}
/* initialize the statusbar display */
rect_sel->context_id =
gtk_statusbar_get_context_id (GTK_STATUSBAR (gdisp->statusbar), "selection");
switch (rect_sel->op)
{
case SELECTION_ADD:
g_snprintf (select_mode, STATUSBAR_SIZE, _("Selection: ADD"));
break;
case SELECTION_SUB:
g_snprintf (select_mode, STATUSBAR_SIZE, _("Selection: SUBTRACT"));
break;
case SELECTION_INTERSECT:
g_snprintf (select_mode, STATUSBAR_SIZE, _("Selection: INTERSECT"));
break;
case SELECTION_REPLACE:
g_snprintf (select_mode, STATUSBAR_SIZE, _("Selection: REPLACE"));
break;
default:
break;
}
gtk_statusbar_push (GTK_STATUSBAR (gdisp->statusbar),
rect_sel->context_id, select_mode);
draw_core_start (rect_sel->core, gdisp->canvas->window, tool);
}
void
rect_select_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
RectSelect *rect_sel;
GDisplay *gdisp;
gint x1, y1;
gint x2, y2;
gint w, h;
gdisp = (GDisplay *) gdisp_ptr;
rect_sel = (RectSelect *) tool->private;
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), rect_sel->context_id);
draw_core_stop (rect_sel->core, tool);
tool->state = INACTIVE;
/* First take care of the case where the user "cancels" the action */
if (! (bevent->state & GDK_BUTTON3_MASK))
{
x1 = (rect_sel->w < 0) ? rect_sel->x + rect_sel->w : rect_sel->x;
y1 = (rect_sel->h < 0) ? rect_sel->y + rect_sel->h : rect_sel->y;
w = (rect_sel->w < 0) ? -rect_sel->w : rect_sel->w;
h = (rect_sel->h < 0) ? -rect_sel->h : rect_sel->h;
if ((!w || !h) && !rect_sel->fixed_size)
{
/* If there is a floating selection, anchor it */
if (gimage_floating_sel (gdisp->gimage))
floating_sel_anchor (gimage_floating_sel (gdisp->gimage));
/* Otherwise, clear the selection mask */
else
gimage_mask_clear (gdisp->gimage);
gdisplays_flush ();
return;
}
x2 = x1 + w;
y2 = y1 + h;
switch (tool->type)
{
case RECT_SELECT:
rect_select (gdisp->gimage,
x1, y1, (x2 - x1), (y2 - y1),
rect_sel->op,
rect_options->feather,
rect_options->feather_radius);
break;
case ELLIPSE_SELECT:
ellipse_select (gdisp->gimage,
x1, y1, (x2 - x1), (y2 - y1),
rect_sel->op,
ellipse_options->antialias,
ellipse_options->feather,
ellipse_options->feather_radius);
break;
default:
break;
}
/* show selection on all views */
gdisplays_flush ();
}
}
void
rect_select_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
RectSelect *rect_sel;
GDisplay *gdisp;
gchar size[STATUSBAR_SIZE];
gint ox, oy;
gint x, y;
gint w, h, s;
gint tw, th;
gdouble ratio;
gdisp = (GDisplay *) gdisp_ptr;
rect_sel = (RectSelect *) tool->private;
/* needed for immediate cursor update on modifier event */
rect_sel->current_x = mevent->x;
rect_sel->current_y = mevent->y;
if (tool->state != ACTIVE)
return;
if (rect_sel->op == SELECTION_ANCHOR)
{
rect_sel->op = SELECTION_REPLACE;
rect_select_cursor_update (tool, mevent, gdisp_ptr);
}
draw_core_pause (rect_sel->core, tool);
/* Calculate starting point */
if (rect_sel->center)
{
ox = rect_sel->x + rect_sel->w / 2;
oy = rect_sel->y + rect_sel->h / 2;
}
else
{
ox = rect_sel->x;
oy = rect_sel->y;
}
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, TRUE, 0);
if (rect_sel->fixed_size)
{
if (mevent->state & GDK_SHIFT_MASK)
{
ratio = (double)(rect_sel->fixed_height /
(double)rect_sel->fixed_width);
tw = x - ox;
th = y - oy;
/*
* This is probably an inefficient way to do it, but it gives
* nicer, more predictable results than the original agorithm
*/
if ((abs(th) < (ratio * abs(tw))) && (abs(tw) > (abs(th) / ratio)))
{
w = tw;
h = (int)(tw * ratio);
/* h should have the sign of th */
if ((th < 0 && h > 0) || (th > 0 && h < 0))
h = -h;
}
else
{
h = th;
w = (int)(th / ratio);
/* w should have the sign of tw */
if ((tw < 0 && w > 0) || (tw > 0 && w < 0))
w = -w;
}
}
else
{
w = (x - ox > 0 ? rect_sel->fixed_width : -rect_sel->fixed_width);
h = (y - oy > 0 ? rect_sel->fixed_height : -rect_sel->fixed_height);
}
}
else
{
w = (x - ox);
h = (y - oy);
}
/* If the shift key is down, then make the rectangle square (or ellipse circular) */
if ((mevent->state & GDK_SHIFT_MASK) && !rect_sel->fixed_size)
{
s = MAX (abs (w), abs (h));
if (w < 0)
w = -s;
else
w = s;
if (h < 0)
h = -s;
else
h = s;
}
/* If the control key is down, create the selection from the center out */
if (mevent->state & GDK_CONTROL_MASK)
{
if (rect_sel->fixed_size)
{
if (mevent->state & GDK_SHIFT_MASK)
{
rect_sel->x = ox - w;
rect_sel->y = oy - h;
rect_sel->w = w * 2;
rect_sel->h = h * 2;
}
else
{
rect_sel->x = ox - w / 2;
rect_sel->y = oy - h / 2;
rect_sel->w = w;
rect_sel->h = h;
}
}
else
{
w = abs(w);
h = abs(h);
rect_sel->x = ox - w;
rect_sel->y = oy - h;
rect_sel->w = 2 * w + 1;
rect_sel->h = 2 * h + 1;
}
rect_sel->center = TRUE;
}
else
{
rect_sel->x = ox;
rect_sel->y = oy;
rect_sel->w = w;
rect_sel->h = h;
rect_sel->center = FALSE;
}
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), rect_sel->context_id);
if (gdisp->dot_for_dot)
{
g_snprintf (size, STATUSBAR_SIZE, gdisp->cursor_format_str,
_("Selection: "), abs(rect_sel->w), " x ", abs(rect_sel->h));
}
else /* show real world units */
{
gdouble unit_factor = gimp_unit_get_factor (gdisp->gimage->unit);
g_snprintf (size, STATUSBAR_SIZE, gdisp->cursor_format_str,
_("Selection: "),
(gdouble) abs(rect_sel->w) * unit_factor /
gdisp->gimage->xresolution,
" x ",
(gdouble) abs(rect_sel->h) * unit_factor /
gdisp->gimage->yresolution);
}
gtk_statusbar_push (GTK_STATUSBAR (gdisp->statusbar), rect_sel->context_id,
size);
draw_core_resume (rect_sel->core, tool);
}
void
rect_select_draw (Tool *tool)
{
GDisplay *gdisp;
RectSelect *rect_sel;
gint x1, y1;
gint x2, y2;
gdisp = (GDisplay *) tool->gdisp_ptr;
rect_sel = (RectSelect *) tool->private;
x1 = MIN (rect_sel->x, rect_sel->x + rect_sel->w);
y1 = MIN (rect_sel->y, rect_sel->y + rect_sel->h);
x2 = MAX (rect_sel->x, rect_sel->x + rect_sel->w);
y2 = MAX (rect_sel->y, rect_sel->y + rect_sel->h);
gdisplay_transform_coords (gdisp, x1, y1, &x1, &y1, 0);
gdisplay_transform_coords (gdisp, x2, y2, &x2, &y2, 0);
gdk_draw_rectangle (rect_sel->core->win,
rect_sel->core->gc, 0,
x1, y1, (x2 - x1), (y2 - y1));
}
static void
selection_tool_update_op_state (RectSelect *rect_sel,
gint x,
gint y,
gint state,
GDisplay *gdisp)
{
Layer *layer;
Layer *floating_sel;
gint tx, ty;
if (active_tool->state == ACTIVE)
return;
gdisplay_untransform_coords (gdisp, x, y, &tx, &ty, FALSE, FALSE);
layer = gimage_pick_correlate_layer (gdisp->gimage, tx, ty);
floating_sel = gimage_floating_sel (gdisp->gimage);
if (state & GDK_MOD1_MASK &&
!gimage_mask_is_empty (gdisp->gimage))
{
rect_sel->op = SELECTION_MOVE_MASK; /* move just the selection mask */
}
else if (!(state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK)) &&
layer &&
(layer == floating_sel ||
(gdisplay_mask_value (gdisp, x, y) &&
floating_sel == NULL)))
{
rect_sel->op = SELECTION_MOVE; /* move the selection */
}
else if ((state & GDK_SHIFT_MASK) &&
!(state & GDK_CONTROL_MASK))
{
rect_sel->op = SELECTION_ADD; /* add to the selection */
}
else if ((state & GDK_CONTROL_MASK) &&
!(state & GDK_SHIFT_MASK))
{
rect_sel->op = SELECTION_SUB; /* subtract from the selection */
}
else if ((state & GDK_CONTROL_MASK) &&
(state & GDK_SHIFT_MASK))
{
rect_sel->op = SELECTION_INTERSECT; /* intersect with selection */
}
else if (floating_sel)
{
rect_sel->op = SELECTION_ANCHOR; /* anchor the selection */
}
else
{
rect_sel->op = SELECTION_REPLACE; /* replace the selection */
}
}
void
rect_select_oper_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
RectSelect *rect_sel;
rect_sel = (RectSelect *) tool->private;
rect_sel->current_x = mevent->x;
rect_sel->current_y = mevent->y;
selection_tool_update_op_state (rect_sel,
rect_sel->current_x,
rect_sel->current_y,
mevent->state, gdisp_ptr);
}
void
rect_select_modifier_update (Tool *tool,
GdkEventKey *kevent,
gpointer gdisp_ptr)
{
RectSelect *rect_sel;
gint state;
state = kevent->state;
switch (kevent->keyval)
{
case GDK_Alt_L: case GDK_Alt_R:
if (state & GDK_MOD1_MASK)
state &= ~GDK_MOD1_MASK;
else
state |= GDK_MOD1_MASK;
break;
case GDK_Shift_L: case GDK_Shift_R:
if (state & GDK_SHIFT_MASK)
state &= ~GDK_SHIFT_MASK;
else
state |= GDK_SHIFT_MASK;
break;
case GDK_Control_L: case GDK_Control_R:
if (state & GDK_CONTROL_MASK)
state &= ~GDK_CONTROL_MASK;
else
state |= GDK_CONTROL_MASK;
break;
}
rect_sel = (RectSelect *) tool->private;
selection_tool_update_op_state (rect_sel,
rect_sel->current_x,
rect_sel->current_y,
state, gdisp_ptr);
}
void
rect_select_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
RectSelect *rect_sel;
GDisplay *gdisp;
rect_sel = (RectSelect *) tool->private;
gdisp = (GDisplay *) gdisp_ptr;
switch (rect_sel->op)
{
case SELECTION_ADD:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
tool->type,
CURSOR_MODIFIER_PLUS,
FALSE);
break;
case SELECTION_SUB:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
tool->type,
CURSOR_MODIFIER_MINUS,
FALSE);
break;
case SELECTION_INTERSECT:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
tool->type,
CURSOR_MODIFIER_INTERSECT,
FALSE);
break;
case SELECTION_REPLACE:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
tool->type,
CURSOR_MODIFIER_NONE,
FALSE);
break;
case SELECTION_MOVE_MASK:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
tool->type,
CURSOR_MODIFIER_MOVE,
FALSE);
break;
case SELECTION_MOVE:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
MOVE,
CURSOR_MODIFIER_NONE,
FALSE);
break;
case SELECTION_ANCHOR:
gdisplay_install_tool_cursor (gdisp, GIMP_MOUSE_CURSOR,
tool->type,
CURSOR_MODIFIER_ANCHOR,
FALSE);
break;
}
}
void
rect_select_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
RectSelect *rect_sel;
rect_sel = (RectSelect *) tool->private;
switch (action)
{
case PAUSE:
draw_core_pause (rect_sel->core, tool);
break;
case RESUME:
draw_core_resume (rect_sel->core, tool);
break;
case HALT:
draw_core_stop (rect_sel->core, tool);
break;
default:
break;
}
}
static void
rect_select_options_reset (void)
{
selection_options_reset (rect_options);
}
Tool *
tools_new_rect_select (void)
{
Tool * tool;
RectSelect * private;
/* The tool options */
if (! rect_options)
{
rect_options =
selection_options_new (RECT_SELECT, rect_select_options_reset);
tools_register (RECT_SELECT, (ToolOptions *) rect_options);
}
tool = tools_new_tool (RECT_SELECT);
private = g_new0 (RectSelect, 1);
private->core = draw_core_new (rect_select_draw);
private->x = private->y = 0;
private->w = private->h = 0;
private->op = SELECTION_REPLACE;
tool->private = (void *) private;
tool->button_press_func = rect_select_button_press;
tool->button_release_func = rect_select_button_release;
tool->motion_func = rect_select_motion;
tool->modifier_key_func = rect_select_modifier_update;
tool->cursor_update_func = rect_select_cursor_update;
tool->oper_update_func = rect_select_oper_update;
tool->control_func = rect_select_control;
return tool;
}
void
tools_free_rect_select (Tool *tool)
{
RectSelect * rect_sel;
rect_sel = (RectSelect *) tool->private;
draw_core_free (rect_sel->core);
g_free (rect_sel);
}
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