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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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "appenv.h"
#include "brushes.h"
#include "drawable.h"
#include "errors.h"
#include "floating_sel.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "interface.h"
#include "layer.h"
#include "layers_dialog.h"
#include "paint_core.h"
#include "undo.h"
#include "layer_pvt.h"
#include "tile_manager_pvt.h"
#include "drawable_pvt.h"
/* feathering variables */
double gimage_mask_feather_radius = 5;
int gimage_mask_border_radius = 5;
int gimage_mask_grow_pixels = 1;
int gimage_mask_shrink_pixels = 1;
int gimage_mask_stroking = FALSE;
/* local functions */
static void * gimage_mask_stroke_paint_func (PaintCore *, GimpDrawable *, int);
/* functions */
int
gimage_mask_boundary (gimage, segs_in, segs_out, num_segs_in, num_segs_out)
GImage * gimage;
BoundSeg **segs_in;
BoundSeg **segs_out;
int *num_segs_in;
int *num_segs_out;
{
Layer *layer;
int x1, y1, x2, y2;
if ((layer = gimage_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 */
channel_boundary (gimage_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 (drawable_channel (gimage_active_drawable (gimage)))
{
return channel_boundary (gimage_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 = gimage_get_active_layer (gimage)))
{
int off_x, off_y;
drawable_offsets (GIMP_DRAWABLE(layer), &off_x, &off_y);
x1 = BOUNDS (off_x, 0, gimage->width);
y1 = BOUNDS (off_y, 0, gimage->height);
x2 = BOUNDS (off_x + drawable_width (GIMP_DRAWABLE(layer)), 0, gimage->width);
y2 = BOUNDS (off_y + drawable_height (GIMP_DRAWABLE(layer)), 0, gimage->height);
return channel_boundary (gimage_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;
}
}
int
gimage_mask_bounds (gimage, x1, y1, x2, y2)
GImage *gimage;
int *x1, *y1, *x2, *y2;
{
return channel_bounds (gimage_get_mask (gimage), x1, y1, x2, y2);
}
void
gimage_mask_invalidate (gimage)
GImage *gimage;
{
Layer *layer;
Channel *mask;
/* Turn the current selection off */
gdisplays_selection_visibility (gimage->ID, SelectionOff);
mask = gimage_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 = gimage_get_active_layer (gimage);
if (layer && layer_is_floating_sel (layer))
drawable_update (GIMP_DRAWABLE(layer), 0, 0, GIMP_DRAWABLE(layer)->width, GIMP_DRAWABLE(layer)->height);
}
int
gimage_mask_value (gimage, x, y)
GImage * gimage;
int x, y;
{
return channel_value (gimage_get_mask (gimage), x, y);
}
int
gimage_mask_is_empty (gimage)
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 channel_is_empty (gimage_get_mask (gimage));
}
void
gimage_mask_translate (gimage, off_x, off_y)
GImage *gimage;
int off_x;
int off_y;
{
channel_translate (gimage_get_mask (gimage), off_x, off_y);
}
TileManager *
gimage_mask_extract (gimage, drawable, cut_gimage, keep_indexed)
GImage * gimage;
GimpDrawable *drawable;
int cut_gimage;
int keep_indexed;
{
TileManager * tiles;
Channel * sel_mask;
PixelRegion srcPR, destPR, maskPR;
unsigned char bg[MAX_CHANNELS];
int bytes, type;
int x1, y1, x2, y2;
int off_x, off_y;
int 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 = drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
if (non_empty && (!(x2 - x1) || !(y2 - y1)))
{
message_box ("Unable to cut/copy because the selected\nregion is empty.", NULL, NULL);
return NULL;
}
/* How many bytes in the temp buffer? */
switch (drawable_type (drawable))
{
case RGB_GIMAGE: case RGBA_GIMAGE:
bytes = 4; type = RGB; break;
case GRAY_GIMAGE: case GRAYA_GIMAGE:
bytes = 2; type = GRAY; break;
case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
if (keep_indexed)
{
bytes = 2; type = GRAY;
}
else
{
bytes = 4; type = INDEXED;
}
break;
default:
bytes = 3;
type = RGB;
break;
}
/* get the selection mask */
if (non_empty)
sel_mask = gimage_get_mask (gimage);
else
sel_mask = NULL;
gimage_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);
drawable_offsets (drawable, &off_x, &off_y);
/* Allocate the temp buffer */
tiles = tile_manager_new ((x2 - x1), (y2 - y1), bytes);
tiles->x = x1 + off_x;
tiles->y = y1 + off_y;
/* configure the pixel regions */
pixel_region_init (&srcPR, 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, drawable_cmap (drawable),
bg, type, drawable_has_alpha (drawable), cut_gimage);
if (cut_gimage)
{
/* Clear the region */
channel_clear (gimage_get_mask (gimage));
/* Update the region */
gdisplays_update_area (gimage->ID, tiles->x, tiles->y,
tiles->levels[0].width, tiles->levels[0].height);
/* Invalidate the preview */
drawable_invalidate_preview (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, drawable_cmap (drawable),
bg, type, 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 && drawable_layer (drawable))
{
if (layer_is_floating_sel (drawable_layer (drawable)))
floating_sel_remove (drawable_layer (drawable));
else
gimage_remove_layer (gimage, GIMP_LAYER (drawable));
}
else if (cut_gimage && drawable_layer_mask (drawable))
{
gimage_remove_layer_mask (gimage, GIMP_LAYER_MASK(drawable)->layer, DISCARD);
}
else if (cut_gimage && drawable_channel (drawable))
gimage_remove_channel (gimage, GIMP_CHANNEL(drawable));
}
return tiles;
}
Layer *
gimage_mask_float (gimage, drawable, off_x, off_y)
GImage * gimage;
GimpDrawable* drawable;
int off_x, off_y; /* optional offset */
{
Layer *layer;
Channel *mask = gimage_get_mask (gimage);
TileManager* tiles;
int non_empty;
int x1, y1, x2, y2;
/* Make sure there is a region to float... */
non_empty = drawable_mask_bounds ( (drawable), &x1, &y1, &x2, &y2);
if (! non_empty || (x2 - x1) == 0 || (y2 - y1) == 0)
{
message_box ("Float Selection: No selection to float.", NULL, NULL);
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);
/* Create a new layer from the buffer */
layer = layer_from_tiles (gimage, drawable, tiles, "Floated Layer", OPAQUE_OPACITY, NORMAL);
/* Set the offsets */
GIMP_DRAWABLE(layer)->offset_x = tiles->x + off_x;
GIMP_DRAWABLE(layer)->offset_y = tiles->y + 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 * gimage;
{
channel_clear (gimage_get_mask (gimage));
}
void
gimage_mask_undo (gimage)
GImage *gimage;
{
channel_push_undo (gimage_get_mask (gimage));
}
void
gimage_mask_invert (gimage)
GImage * gimage;
{
channel_invert (gimage_get_mask (gimage));
}
void
gimage_mask_sharpen (gimage)
GImage * gimage;
{
/* No need to play with the selection visibility
* because sharpen will not change the outline
*/
channel_sharpen (gimage_get_mask (gimage));
}
void
gimage_mask_all (gimage)
GImage * gimage;
{
channel_all (gimage_get_mask (gimage));
}
void
gimage_mask_none (gimage)
GImage * gimage;
{
channel_clear (gimage_get_mask (gimage));
}
void
gimage_mask_feather (gimage, feather_radius)
GImage * gimage;
double feather_radius;
{
gimage_mask_feather_radius = feather_radius;
/* push the current mask onto the undo stack--need to do this here because
* channel_feather doesn't do it
*/
channel_push_undo (gimage_get_mask (gimage));
/* feather the region */
channel_feather (gimage_get_mask (gimage),
gimage_get_mask (gimage),
gimage_mask_feather_radius, REPLACE, 0, 0);
}
void
gimage_mask_border (gimage, border_radius)
GImage * gimage;
int border_radius;
{
gimage_mask_border_radius = border_radius;
/* feather the region */
channel_border (gimage_get_mask (gimage),
gimage_mask_border_radius);
}
void
gimage_mask_grow (gimage, grow_pixels)
GImage * gimage;
int grow_pixels;
{
gimage_mask_grow_pixels = grow_pixels;
/* feather the region */
channel_grow (gimage_get_mask (gimage),
gimage_mask_grow_pixels);
}
void
gimage_mask_shrink (gimage, shrink_pixels)
GImage * gimage;
int shrink_pixels;
{
gimage_mask_shrink_pixels = shrink_pixels;
/* feather the region */
channel_shrink (gimage_get_mask (gimage),
gimage_mask_shrink_pixels);
}
void
gimage_mask_layer_alpha (gimage, layer)
GImage *gimage;
Layer *layer;
{
/* extract the layer's alpha channel */
if (drawable_has_alpha (GIMP_DRAWABLE (layer)))
{
/* load the mask with the given layer's alpha channel */
channel_layer_alpha (gimage_get_mask (gimage), layer);
}
else
{
message_box ("The active layer has no alpha channel\nto convert to a selection.", NULL, NULL);
return;
}
}
void
gimage_mask_layer_mask (gimage, layer)
GImage *gimage;
Layer *layer;
{
/* extract the layer's alpha channel */
if (layer->mask)
{
/* load the mask with the given layer's alpha channel */
channel_layer_mask (gimage_get_mask (gimage), layer);
}
else
{
message_box ("The active layer has no mask\nto convert to a selection.", NULL, NULL);
return;
}
}
void
gimage_mask_load (gimage, channel)
GImage *gimage;
Channel *channel;
{
/* Load the specified channel to the gimage mask */
channel_load (gimage_get_mask (gimage), (channel));
}
Channel *
gimage_mask_save (gimage)
GImage *gimage;
{
Channel *new_channel;
new_channel = channel_copy (gimage_get_mask (gimage));
/* saved selections are not visible by default */
GIMP_DRAWABLE(new_channel)->visible = FALSE;
gimage_add_channel (gimage, new_channel, -1);
return new_channel;
}
int
gimage_mask_stroke (gimage, drawable)
GImage *gimage;
GimpDrawable *drawable;
{
BoundSeg *bs_in;
BoundSeg *bs_out;
int num_segs_in;
int num_segs_out;
BoundSeg *stroke_segs;
int num_strokes;
int seg;
int offx, offy;
int i;
if (! gimage_mask_boundary (gimage, &bs_in, &bs_out, &num_segs_in, &num_segs_out))
{
message_box ("No selection to stroke!", NULL, NULL);
return FALSE;
}
stroke_segs = sort_boundary (bs_in, num_segs_in, &num_strokes);
if (num_strokes == 0)
return TRUE;
/* find the drawable offsets */
drawable_offsets (drawable, &offx, &offy);
/* init the paint core */
if (! paint_core_init (&non_gui_paint_core, drawable,
(stroke_segs[0].x1 - offx),
(stroke_segs[0].y1 - offy)))
return FALSE;
/* set the paint core's paint func */
non_gui_paint_core.paint_func = gimage_mask_stroke_paint_func;
gimage_mask_stroking = TRUE;
non_gui_paint_core.startx = non_gui_paint_core.lastx = (stroke_segs[0].x1 - offx);
non_gui_paint_core.starty = non_gui_paint_core.lasty = (stroke_segs[0].y1 - offy);
seg = 0;
for (i = 0; i < num_strokes; i++)
{
while (stroke_segs[seg].x2 != -1)
{
non_gui_paint_core.curx = (stroke_segs[seg].x2 - offx);
non_gui_paint_core.cury = (stroke_segs[seg].y2 - offy);
paint_core_interpolate (&non_gui_paint_core, drawable);
non_gui_paint_core.lastx = non_gui_paint_core.curx;
non_gui_paint_core.lasty = non_gui_paint_core.cury;
seg ++;
}
seg ++;
non_gui_paint_core.startx = non_gui_paint_core.lastx = (stroke_segs[seg].x1 - offx);
non_gui_paint_core.starty = non_gui_paint_core.lasty = (stroke_segs[seg].y1 - offy);
}
/* finish the painting */
paint_core_finish (&non_gui_paint_core, drawable, -1);
/* cleanup */
gimage_mask_stroking = FALSE;
paint_core_cleanup ();
g_free (stroke_segs);
return TRUE;
}
static void *
gimage_mask_stroke_paint_func (paint_core, drawable, state)
PaintCore *paint_core;
GimpDrawable *drawable;
int state;
{
GImage *gimage;
TempBuf * area;
unsigned char col[MAX_CHANNELS];
if (! (gimage = drawable_gimage (drawable)))
return NULL;
gimage_get_foreground (gimage, drawable, col);
/* Get a region which can be used to paint to */
if (! (area = paint_core_get_paint_area (paint_core, drawable)))
return NULL;
/* set the alpha channel */
col[area->bytes - 1] = OPAQUE_OPACITY;
/* color the pixels */
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
/* paste the newly painted canvas to the gimage which is being worked on */
paint_core_paste_canvas (paint_core, drawable, OPAQUE_OPACITY,
(int) (get_brush_opacity () * 255),
get_brush_paint_mode (), SOFT, CONSTANT);
return NULL;
}
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