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gimp/app/gimage_mask.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 <gtk/gtk.h>
#include "apptypes.h"
#include "boundary.h"
#include "drawable.h"
#include "floating_sel.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "gimpchannel.h"
#include "gimpimage.h"
#include "gimplayer.h"
#include "gimplayermask.h"
#include "gimprc.h"
#include "paint_funcs.h"
#include "pixel_region.h"
#include "tile_manager.h"
#include "undo.h"
#include "tools/paint_core.h"
#include "tools/paint_options.h"
#include "tools/tools.h"
#include "pdb/procedural_db.h"
#include "libgimp/gimpintl.h"
/* local variables */
static int gimage_mask_stroking = FALSE;
/* functions */
gboolean
gimage_mask_boundary (GImage *gimage,
BoundSeg **segs_in,
BoundSeg **segs_out,
gint *num_segs_in,
gint *num_segs_out)
{
GimpDrawable *d;
GimpLayer *layer;
gint x1, y1;
gint x2, y2;
if ((layer = gimp_image_floating_sel (gimage)))
{
/* If there is a floating selection, then
* we need to do some slightly different boundaries.
* Instead of inside and outside boundaries being defined
* by the extents of the layer, the inside boundary (the one
* that actually marches and is black/white) is the boundary of
* the floating selection. The outside boundary (doesn't move,
* is black/gray) is defined as the normal selection mask
*/
/* Find the selection mask boundary */
gimp_channel_boundary (gimp_image_get_mask (gimage),
segs_in, segs_out,
num_segs_in, num_segs_out,
0, 0, 0, 0);
/* Find the floating selection boundary */
*segs_in = floating_sel_boundary (layer, num_segs_in);
return TRUE;
}
/* Otherwise, return the boundary...if a channel is active */
else if ((d = gimp_image_active_drawable (gimage)) &&
GIMP_IS_CHANNEL (d))
{
return gimp_channel_boundary (gimp_image_get_mask (gimage),
segs_in, segs_out,
num_segs_in, num_segs_out,
0, 0, gimage->width, gimage->height);
}
/* if a layer is active, we return multiple boundaries based on the extents */
else if ((layer = gimp_image_get_active_layer (gimage)))
{
gint off_x, off_y;
gimp_drawable_offsets (GIMP_DRAWABLE(layer), &off_x, &off_y);
x1 = CLAMP (off_x, 0, gimage->width);
y1 = CLAMP (off_y, 0, gimage->height);
x2 = CLAMP (off_x + gimp_drawable_width (GIMP_DRAWABLE(layer)), 0,
gimage->width);
y2 = CLAMP (off_y + gimp_drawable_height (GIMP_DRAWABLE(layer)), 0,
gimage->height);
return gimp_channel_boundary (gimp_image_get_mask (gimage),
segs_in, segs_out,
num_segs_in, num_segs_out,
x1, y1, x2, y2);
}
else
{
*segs_in = NULL;
*segs_out = NULL;
*num_segs_in = 0;
*num_segs_out = 0;
return FALSE;
}
}
gboolean
gimage_mask_bounds (GImage *gimage,
gint *x1,
gint *y1,
gint *x2,
gint *y2)
{
return gimp_channel_bounds (gimp_image_get_mask (gimage), x1, y1, x2, y2);
}
void
gimage_mask_invalidate (GImage *gimage)
{
GimpLayer *layer;
GimpChannel *mask;
/* Turn the current selection off */
gdisplays_selection_visibility (gimage, SelectionOff);
mask = gimp_image_get_mask (gimage);
mask->boundary_known = FALSE;
/* If there is a floating selection, update it's area...
* we need to do this since this selection mask can act as an additional
* mask in the composition of the floating selection
*/
layer = gimp_image_get_active_layer (gimage);
if (layer && gimp_layer_is_floating_sel (layer))
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
}
gint
gimage_mask_value (GImage *gimage,
gint x,
gint y)
{
return gimp_channel_value (gimp_image_get_mask (gimage), x, y);
}
gboolean
gimage_mask_is_empty (GImage *gimage)
{
/* in order to allow stroking of selections, we need to pretend here
* that the selection mask is empty so that it doesn't mask the paint
* during the stroke operation.
*/
if (gimage_mask_stroking)
return TRUE;
else
return gimp_channel_is_empty (gimp_image_get_mask (gimage));
}
void
gimage_mask_translate (GImage *gimage,
gint off_x,
gint off_y)
{
gimp_channel_translate (gimp_image_get_mask (gimage), off_x, off_y);
}
TileManager *
gimage_mask_extract (GImage *gimage,
GimpDrawable *drawable,
gboolean cut_gimage,
gboolean keep_indexed,
gboolean add_alpha)
{
TileManager *tiles;
GimpChannel *sel_mask;
PixelRegion srcPR, destPR, maskPR;
guchar bg[MAX_CHANNELS];
gint bytes, type;
gint x1, y1;
gint x2, y2;
gint off_x, off_y;
gboolean non_empty;
if (!drawable)
return NULL;
/* If there are no bounds, then just extract the entire image
* This may not be the correct behavior, but after getting rid
* of floating selections, it's still tempting to "cut" or "copy"
* a small layer and expect it to work, even though there is no
* actual selection mask
*/
non_empty = gimp_drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
if (non_empty && (!(x2 - x1) || !(y2 - y1)))
{
g_message (_("Unable to cut/copy because the selected\n"
"region is empty."));
return NULL;
}
/* How many bytes in the temp buffer? */
switch (gimp_drawable_type (drawable))
{
case RGB_GIMAGE: case RGBA_GIMAGE:
bytes = add_alpha ? 4 : drawable->bytes;
type = RGB;
break;
case GRAY_GIMAGE: case GRAYA_GIMAGE:
bytes = add_alpha ? 2 : drawable->bytes;
type = GRAY;
break;
case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
if (keep_indexed)
{
bytes = add_alpha ? 2 : drawable->bytes;
type = GRAY;
}
else
{
bytes = add_alpha ? 4 : drawable->bytes;
type = INDEXED;
}
break;
default:
bytes = 3;
type = RGB;
break;
}
/* get the selection mask */
if (non_empty)
sel_mask = gimp_image_get_mask (gimage);
else
sel_mask = NULL;
gimp_image_get_background (gimage, drawable, bg);
/* If a cut was specified, and the selection mask is not empty,
* push an undo
*/
if (cut_gimage && non_empty)
drawable_apply_image (drawable, x1, y1, x2, y2, NULL, FALSE);
gimp_drawable_offsets (drawable, &off_x, &off_y);
/* Allocate the temp buffer */
tiles = tile_manager_new ((x2 - x1), (y2 - y1), bytes);
tile_manager_set_offsets (tiles, x1 + off_x, y1 + off_y);
/* configure the pixel regions */
pixel_region_init (&srcPR, gimp_drawable_data (drawable),
x1, y1, (x2 - x1), (y2 - y1), cut_gimage);
pixel_region_init (&destPR, tiles, 0, 0, (x2 - x1), (y2 - y1), TRUE);
/* If there is a selection, extract from it */
if (non_empty)
{
pixel_region_init (&maskPR, GIMP_DRAWABLE(sel_mask)->tiles,
(x1 + off_x), (y1 + off_y), (x2 - x1), (y2 - y1),
FALSE);
extract_from_region (&srcPR, &destPR, &maskPR,
gimp_drawable_cmap (drawable),
bg, type,
gimp_drawable_has_alpha (drawable), cut_gimage);
if (cut_gimage)
{
/* Clear the region */
gimp_channel_clear (gimp_image_get_mask (gimage));
/* Update the region */
gdisplays_update_area (gimage,
x1 + off_x, y1 + off_y,
(x2 - x1), (y2 - y1));
/* Invalidate the preview */
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (drawable));
}
}
/* Otherwise, get the entire active layer */
else
{
/* If the layer is indexed...we need to extract pixels */
if (type == INDEXED && !keep_indexed)
extract_from_region (&srcPR, &destPR, NULL,
gimp_drawable_cmap (drawable),
bg, type,
gimp_drawable_has_alpha (drawable), FALSE);
/* If the layer doesn't have an alpha channel, add one */
else if (bytes > srcPR.bytes)
add_alpha_region (&srcPR, &destPR);
/* Otherwise, do a straight copy */
else
copy_region (&srcPR, &destPR);
/* If we're cutting, remove either the layer (or floating selection),
* the layer mask, or the channel
*/
if (cut_gimage && GIMP_IS_LAYER (drawable))
{
if (gimp_layer_is_floating_sel (GIMP_LAYER (drawable)))
floating_sel_remove (GIMP_LAYER (drawable));
else
gimp_image_remove_layer (gimage, GIMP_LAYER (drawable));
}
else if (cut_gimage && GIMP_IS_LAYER_MASK (drawable))
{
gimp_image_remove_layer_mask (gimage,
gimp_layer_mask_get_layer (GIMP_LAYER_MASK (drawable)),
DISCARD);
}
else if (cut_gimage && GIMP_IS_CHANNEL (drawable))
gimp_image_remove_channel (gimage, GIMP_CHANNEL (drawable));
}
return tiles;
}
GimpLayer *
gimage_mask_float (GImage *gimage,
GimpDrawable *drawable,
gint off_x, /* optional offset */
gint off_y)
{
GimpLayer *layer;
GimpChannel *mask = gimp_image_get_mask (gimage);
TileManager *tiles;
gboolean non_empty;
gint x1, y1;
gint x2, y2;
/* Make sure there is a region to float... */
non_empty = gimp_drawable_mask_bounds ( (drawable), &x1, &y1, &x2, &y2);
if (! non_empty || (x2 - x1) == 0 || (y2 - y1) == 0)
{
g_message (_("Float Selection: No selection to float."));
return NULL;
}
/* Start an undo group */
undo_push_group_start (gimage, FLOAT_MASK_UNDO);
/* Cut the selected region */
tiles = gimage_mask_extract (gimage, drawable, TRUE, FALSE, TRUE);
/* Create a new layer from the buffer */
layer = gimp_layer_new_from_tiles (gimage,
gimp_drawable_type_with_alpha (drawable),
tiles,
_("Floated Layer"),
OPAQUE_OPACITY, NORMAL_MODE);
/* Set the offsets */
tile_manager_get_offsets (tiles, &x1, &y1);
GIMP_DRAWABLE (layer)->offset_x = x1 + off_x;
GIMP_DRAWABLE (layer)->offset_y = y1 + off_y;
/* Free the temp buffer */
tile_manager_destroy (tiles);
/* Add the floating layer to the gimage */
floating_sel_attach (layer, drawable);
/* End an undo group */
undo_push_group_end (gimage);
/* invalidate the gimage's boundary variables */
mask->boundary_known = FALSE;
return layer;
}
void
gimage_mask_clear (GImage *gimage)
{
gimp_channel_clear (gimp_image_get_mask (gimage));
}
void
gimage_mask_undo (GImage *gimage)
{
gimp_channel_push_undo (gimp_image_get_mask (gimage));
}
void
gimage_mask_invert (GImage *gimage)
{
gimp_channel_invert (gimp_image_get_mask (gimage));
}
void
gimage_mask_sharpen (GImage *gimage)
{
/* No need to play with the selection visibility
* because sharpen will not change the outline
*/
gimp_channel_sharpen (gimp_image_get_mask (gimage));
}
void
gimage_mask_all (GImage *gimage)
{
gimp_channel_all (gimp_image_get_mask (gimage));
}
void
gimage_mask_none (GImage *gimage)
{
gimp_channel_clear (gimp_image_get_mask (gimage));
}
void
gimage_mask_feather (GImage *gimage,
gdouble feather_radius_x,
gdouble feather_radius_y)
{
/* push the current mask onto the undo stack--need to do this here because
* gimp_channel_feather doesn't do it
*/
gimp_channel_push_undo (gimp_image_get_mask (gimage));
/* feather the region */
gimp_channel_feather (gimp_image_get_mask (gimage),
gimp_image_get_mask (gimage),
feather_radius_x,
feather_radius_y,
CHANNEL_OP_REPLACE, 0, 0);
}
void
gimage_mask_border (GImage *gimage,
gint border_radius_x,
gint border_radius_y)
{
/* feather the region */
gimp_channel_border (gimp_image_get_mask (gimage),
border_radius_x,
border_radius_y);
}
void
gimage_mask_grow (GImage *gimage,
int grow_pixels_x,
int grow_pixels_y)
{
/* feather the region */
gimp_channel_grow (gimp_image_get_mask (gimage),
grow_pixels_x,
grow_pixels_y);
}
void
gimage_mask_shrink (GImage *gimage,
gint shrink_pixels_x,
gint shrink_pixels_y,
gboolean edge_lock)
{
/* feather the region */
gimp_channel_shrink (gimp_image_get_mask (gimage),
shrink_pixels_x,
shrink_pixels_y,
edge_lock);
}
void
gimage_mask_layer_alpha (GimpImage *gimage,
GimpLayer *layer)
{
/* extract the layer's alpha channel */
if (gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)))
{
/* load the mask with the given layer's alpha channel */
gimp_channel_layer_alpha (gimp_image_get_mask (gimage), layer);
}
else
{
g_message (_("The active layer has no alpha channel\n"
"to convert to a selection."));
return;
}
}
void
gimage_mask_layer_mask (GimpImage *gimage,
GimpLayer *layer)
{
/* extract the layer's alpha channel */
if (gimp_layer_get_mask (layer))
{
/* load the mask with the given layer's alpha channel */
gimp_channel_layer_mask (gimp_image_get_mask (gimage), layer);
}
else
{
g_message (_("The active layer has no mask\n"
"to convert to a selection."));
return;
}
}
void
gimage_mask_load (GImage *gimage,
GimpChannel *channel)
{
/* Load the specified channel to the gimage mask */
gimp_channel_load (gimp_image_get_mask (gimage), (channel));
}
GimpChannel *
gimage_mask_save (GImage *gimage)
{
GimpChannel *new_channel;
new_channel = gimp_channel_copy (gimp_image_get_mask (gimage));
/* saved selections are not visible by default */
GIMP_DRAWABLE(new_channel)->visible = FALSE;
gimp_image_add_channel (gimage, new_channel, -1);
return new_channel;
}
gboolean
gimage_mask_stroke (GImage *gimage,
GimpDrawable *drawable)
{
BoundSeg *bs_in;
BoundSeg *bs_out;
gint num_segs_in;
gint num_segs_out;
BoundSeg *stroke_segs;
gint num_strokes;
gint seg;
gint offx, offy;
gint i;
gdouble *stroke_points;
gint cpnt;
Argument *return_vals;
gint nreturn_vals;
if (! gimage_mask_boundary (gimage, &bs_in, &bs_out,
&num_segs_in, &num_segs_out))
{
g_message (_("No selection to stroke!"));
return FALSE;
}
stroke_segs = sort_boundary (bs_in, num_segs_in, &num_strokes);
if (num_strokes == 0)
return TRUE;
/* find the drawable offsets */
gimp_drawable_offsets (drawable, &offx, &offy);
gimage_mask_stroking = TRUE;
/* Start an undo group */
undo_push_group_start (gimage, PAINT_CORE_UNDO);
seg = 0;
cpnt = 0;
/* Largest array required (may be used in segments!) */
stroke_points = g_malloc (sizeof (gdouble) * 2 * (num_segs_in + 4));
/* we offset all coordinates by 0.5 to align the brush with the path */
stroke_points[cpnt++] = (gdouble)(stroke_segs[0].x1 - offx + 0.5);
stroke_points[cpnt++] = (gdouble)(stroke_segs[0].y1 - offy + 0.5);
for (i = 0; i < num_strokes; i++)
{
while ((stroke_segs[seg].x1 != -1 ||
stroke_segs[seg].x2 != -1 ||
stroke_segs[seg].y1 != -1 ||
stroke_segs[seg].y2 != -1))
{
stroke_points[cpnt++] = (gdouble)(stroke_segs[seg].x2 - offx + 0.5);
stroke_points[cpnt++] = (gdouble)(stroke_segs[seg].y2 - offy + 0.5);
seg ++;
}
/* Close the stroke points up */
stroke_points[cpnt++] = stroke_points[0];
stroke_points[cpnt++] = stroke_points[1];
/* Stroke with the correct tool */
return_vals =
procedural_db_run_proc (tool_active_PDB_string (),
&nreturn_vals,
PDB_DRAWABLE, gimp_drawable_get_ID (drawable),
PDB_INT32, (gint32) cpnt,
PDB_FLOATARRAY, stroke_points,
PDB_END);
if (return_vals && return_vals[0].value.pdb_int == PDB_SUCCESS)
{
/* Not required */
/*gdisplays_flush ();*/
}
else
g_message (_("Paintbrush operation failed."));
procedural_db_destroy_args (return_vals, nreturn_vals);
cpnt = 0;
seg ++;
stroke_points[cpnt++] = (gdouble)(stroke_segs[seg].x1 - offx + 0.5);
stroke_points[cpnt++] = (gdouble)(stroke_segs[seg].y1 - offy + 0.5);
}
/* cleanup */
gimage_mask_stroking = FALSE;
g_free (stroke_points);
g_free (stroke_segs);
/* End an undo group */
undo_push_group_end (gimage);
return TRUE;
}
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