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gimp/app/core/gimpchannel.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 <string.h>
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/boundary.h"
#include "base/gimplut.h"
#include "base/lut-funcs.h"
#include "base/pixel-processor.h"
#include "base/pixel-region.h"
#include "base/tile.h"
#include "base/tile-manager.h"
#include "paint-funcs/paint-funcs.h"
#include "gimpimage.h"
#include "gimpimage-projection.h"
#include "gimpimage-undo-push.h"
#include "gimpchannel.h"
#include "gimplayer.h"
#include "gimpparasitelist.h"
#include "libgimp/gimpintl.h"
static void gimp_channel_class_init (GimpChannelClass *klass);
static void gimp_channel_init (GimpChannel *channel);
static void gimp_channel_finalize (GObject *object);
static gsize gimp_channel_get_memsize (GimpObject *object);
static GimpItem * gimp_channel_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha);
static void gimp_channel_push_undo (GimpChannel *mask,
const gchar *undo_desc);
static void gimp_channel_validate (TileManager *tm,
Tile *tile);
static GimpDrawableClass * parent_class = NULL;
GType
gimp_channel_get_type (void)
{
static GType channel_type = 0;
if (! channel_type)
{
static const GTypeInfo channel_info =
{
sizeof (GimpChannelClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_channel_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpChannel),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_channel_init,
};
channel_type = g_type_register_static (GIMP_TYPE_DRAWABLE,
"GimpChannel",
&channel_info, 0);
}
return channel_type;
}
static void
gimp_channel_class_init (GimpChannelClass *klass)
{
GObjectClass *object_class;
GimpObjectClass *gimp_object_class;
GimpItemClass *item_class;
object_class = G_OBJECT_CLASS (klass);
gimp_object_class = GIMP_OBJECT_CLASS (klass);
item_class = GIMP_ITEM_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_channel_finalize;
gimp_object_class->get_memsize = gimp_channel_get_memsize;
item_class->duplicate = gimp_channel_duplicate;
item_class->default_name = _("Channel");
item_class->rename_desc = _("Rename Channel");
}
static void
gimp_channel_init (GimpChannel *channel)
{
gimp_rgba_set (&channel->color, 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
channel->show_masked = FALSE;
/* Selection mask variables */
channel->boundary_known = FALSE;
channel->segs_in = NULL;
channel->segs_out = NULL;
channel->num_segs_in = 0;
channel->num_segs_out = 0;
channel->empty = FALSE;
channel->bounds_known = FALSE;
channel->x1 = 0;
channel->y1 = 0;
channel->x2 = 0;
channel->y2 = 0;
}
static void
gimp_channel_finalize (GObject *object)
{
GimpChannel *channel;
channel = GIMP_CHANNEL (object);
if (channel->segs_in)
{
g_free (channel->segs_in);
channel->segs_in = NULL;
}
if (channel->segs_out)
{
g_free (channel->segs_out);
channel->segs_out = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gsize
gimp_channel_get_memsize (GimpObject *object)
{
GimpChannel *channel;
gsize memsize = 0;
channel = GIMP_CHANNEL (object);
memsize += channel->num_segs_in * sizeof (BoundSeg);
memsize += channel->num_segs_out * sizeof (BoundSeg);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object);
}
static GimpItem *
gimp_channel_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha)
{
GimpChannel *channel;
GimpItem *new_item;
GimpChannel *new_channel;
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_DRAWABLE), NULL);
if (g_type_is_a (new_type, GIMP_TYPE_CHANNEL))
add_alpha = FALSE;
new_item = GIMP_ITEM_CLASS (parent_class)->duplicate (item, new_type,
add_alpha);
if (! GIMP_IS_CHANNEL (new_item))
return new_item;
channel = GIMP_CHANNEL (item);
new_channel = GIMP_CHANNEL (new_item);
/* set the channel color and opacity */
new_channel->color = channel->color;
new_channel->show_masked = channel->show_masked;
/* selection mask variables */
new_channel->bounds_known = channel->bounds_known;
new_channel->empty = channel->empty;
new_channel->x1 = channel->x1;
new_channel->y1 = channel->y1;
new_channel->x2 = channel->x2;
new_channel->y2 = channel->y2;
return new_item;
}
static void
gimp_channel_push_undo (GimpChannel *mask,
const gchar *undo_desc)
{
GimpImage *gimage;
gimage = gimp_item_get_image (GIMP_ITEM (mask));
g_return_if_fail (gimage != NULL);
gimp_image_undo_push_mask (gimage, undo_desc, mask);
mask->boundary_known = FALSE;
/* invalidate the preview */
GIMP_DRAWABLE (mask)->preview_valid = FALSE;
}
static void
gimp_channel_validate (TileManager *tm,
Tile *tile)
{
/* Set the contents of the tile to empty */
memset (tile_data_pointer (tile, 0, 0),
TRANSPARENT_OPACITY, tile_size (tile));
}
/* public functions */
GimpChannel *
gimp_channel_new (GimpImage *gimage,
gint width,
gint height,
const gchar *name,
const GimpRGB *color)
{
GimpChannel *channel;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (color != NULL, NULL);
channel = g_object_new (GIMP_TYPE_CHANNEL, NULL);
gimp_drawable_configure (GIMP_DRAWABLE (channel),
gimage,
0, 0, width, height,
GIMP_GRAY_IMAGE, name);
/* set the channel color and opacity */
channel->color = *color;
channel->show_masked = TRUE;
/* selection mask variables */
channel->x2 = width;
channel->y2 = height;
return channel;
}
GimpChannel *
gimp_channel_new_from_component (GimpImage *gimage,
GimpChannelType type,
const gchar *name,
const GimpRGB *color)
{
GimpChannel *channel;
TileManager *projection;
PixelRegion src;
PixelRegion dest;
gint width;
gint height;
gint pixel = -1;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (color != NULL, NULL);
switch (type)
{
case GIMP_RED_CHANNEL: pixel = RED_PIX; break;
case GIMP_GREEN_CHANNEL: pixel = GREEN_PIX; break;
case GIMP_BLUE_CHANNEL: pixel = BLUE_PIX; break;
case GIMP_GRAY_CHANNEL: pixel = GRAY_PIX; break;
case GIMP_INDEXED_CHANNEL: pixel = INDEXED_PIX; break;
case GIMP_ALPHA_CHANNEL:
switch (gimp_image_base_type (gimage))
{
case GIMP_RGB: pixel = ALPHA_PIX; break;
case GIMP_GRAY: pixel = ALPHA_G_PIX; break;
case GIMP_INDEXED: pixel = ALPHA_I_PIX; break;
}
break;
}
g_return_val_if_fail (pixel != -1, NULL);
projection = gimp_image_projection (gimage);
width = tile_manager_width (projection);
height = tile_manager_height (projection);
channel = gimp_channel_new (gimage, width, height, name, color);
pixel_region_init (&src, projection,
0, 0, width, height, FALSE);
pixel_region_init (&dest, GIMP_DRAWABLE (channel)->tiles,
0, 0, width, height, TRUE);
copy_component (&src, &dest, pixel);
return channel;
}
void
gimp_channel_set_color (GimpChannel *channel,
const GimpRGB *color)
{
g_return_if_fail (GIMP_IS_CHANNEL (channel));
g_return_if_fail (color != NULL);
if (gimp_rgba_distance (&channel->color, color) > 0.0001)
{
channel->color = *color;
gimp_drawable_update (GIMP_DRAWABLE (channel),
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height);
}
}
void
gimp_channel_get_color (const GimpChannel *channel,
GimpRGB *color)
{
g_return_if_fail (GIMP_IS_CHANNEL (channel));
g_return_if_fail (color != NULL);
*color = channel->color;
}
gdouble
gimp_channel_get_opacity (const GimpChannel *channel)
{
g_return_val_if_fail (GIMP_IS_CHANNEL (channel), GIMP_OPACITY_TRANSPARENT);
return channel->color.a;
}
void
gimp_channel_set_opacity (GimpChannel *channel,
gdouble opacity)
{
g_return_if_fail (GIMP_IS_CHANNEL (channel));
opacity = CLAMP (opacity, GIMP_OPACITY_TRANSPARENT, GIMP_OPACITY_OPAQUE);
channel->color.a = opacity;
}
gboolean
gimp_channel_get_show_masked (GimpChannel *channel)
{
g_return_val_if_fail (GIMP_IS_CHANNEL (channel), FALSE);
return channel->show_masked;
}
void
gimp_channel_set_show_masked (GimpChannel *channel,
gboolean show_masked)
{
g_return_if_fail (GIMP_IS_CHANNEL (channel));
if (show_masked != channel->show_masked)
{
channel->show_masked = show_masked ? TRUE : FALSE;
gimp_drawable_update (GIMP_DRAWABLE (channel),
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height);
}
}
void
gimp_channel_scale (GimpChannel *channel,
gint new_width,
gint new_height,
GimpInterpolationType interpolation_type)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
g_return_if_fail (GIMP_IS_CHANNEL (channel));
if (new_width == 0 || new_height == 0)
return;
/* Update the old channel position */
gimp_drawable_update (GIMP_DRAWABLE (channel),
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height);
/* Allocate the new channel */
new_tiles = tile_manager_new (new_width, new_height, 1);
/* Configure the pixel regions */
pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height,
FALSE);
pixel_region_init (&destPR, new_tiles,
0, 0,
new_width, new_height,
TRUE);
/* Sclae the channel */
scale_region (&srcPR, &destPR, interpolation_type);
/* Push the channel on the undo stack */
gimp_image_undo_push_channel_mod (gimp_item_get_image (GIMP_ITEM (channel)),
_("Scale Channel"),
channel);
/* Configure the new channel */
GIMP_DRAWABLE (channel)->tiles = new_tiles;
GIMP_DRAWABLE (channel)->width = new_width;
GIMP_DRAWABLE (channel)->height = new_height;
/* bounds are now unknown */
channel->bounds_known = FALSE;
/* Update the new channel position */
gimp_drawable_update (GIMP_DRAWABLE (channel),
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height);
gimp_viewable_size_changed (GIMP_VIEWABLE (channel));
}
void
gimp_channel_resize (GimpChannel *channel,
gint new_width,
gint new_height,
gint offx,
gint offy)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
guchar bg = 0;
gint clear;
gint w, h;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (channel));
if (new_width == 0 || new_height == 0)
return;
x1 = CLAMP (offx, 0, new_width);
y1 = CLAMP (offy, 0, new_height);
x2 = CLAMP ((offx + GIMP_DRAWABLE (channel)->width), 0, new_width);
y2 = CLAMP ((offy + GIMP_DRAWABLE (channel)->height), 0, new_height);
w = x2 - x1;
h = y2 - y1;
if (offx > 0)
{
x1 = 0;
x2 = offx;
}
else
{
x1 = -offx;
x2 = 0;
}
if (offy > 0)
{
y1 = 0;
y2 = offy;
}
else
{
y1 = -offy;
y2 = 0;
}
/* Update the old channel position */
gimp_drawable_update (GIMP_DRAWABLE (channel),
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height);
/* Configure the pixel regions */
pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
x1, y1, w, h, FALSE);
/* Determine whether the new channel needs to be initially cleared */
if ((new_width > GIMP_DRAWABLE (channel)->width) ||
(new_height > GIMP_DRAWABLE (channel)->height) ||
(x2 || y2))
clear = TRUE;
else
clear = FALSE;
/* Allocate the new channel, configure dest region */
new_tiles = tile_manager_new (new_width, new_height, 1);
/* Set to black (empty--for selections) */
if (clear)
{
pixel_region_init (&destPR, new_tiles,
0, 0,
new_width, new_height,
TRUE);
color_region (&destPR, &bg);
}
/* copy from the old to the new */
pixel_region_init (&destPR, new_tiles, x2, y2, w, h, TRUE);
if (w && h)
copy_region (&srcPR, &destPR);
/* Push the channel on the undo stack */
gimp_image_undo_push_channel_mod (gimp_item_get_image (GIMP_ITEM (channel)),
_("Resize Channel"),
channel);
/* Configure the new channel */
GIMP_DRAWABLE (channel)->tiles = new_tiles;
GIMP_DRAWABLE (channel)->width = new_width;
GIMP_DRAWABLE (channel)->height = new_height;
/* bounds are now unknown */
channel->bounds_known = FALSE;
/* update the new channel area */
gimp_drawable_update (GIMP_DRAWABLE (channel),
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height);
gimp_viewable_size_changed (GIMP_VIEWABLE (channel));
}
/******************************/
/* selection mask functions */
/******************************/
GimpChannel *
gimp_channel_new_mask (GimpImage *gimage,
gint width,
gint height)
{
GimpRGB black = { 0.0, 0.0, 0.0, 0.5 };
GimpChannel *new_channel;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
/* Create the new channel */
new_channel = gimp_channel_new (gimage, width, height,
_("Selection Mask"), &black);
/* Set the validate procedure */
tile_manager_set_validate_proc (GIMP_DRAWABLE (new_channel)->tiles,
gimp_channel_validate);
return new_channel;
}
gboolean
gimp_channel_boundary (GimpChannel *mask,
BoundSeg **segs_in,
BoundSeg **segs_out,
gint *num_segs_in,
gint *num_segs_out,
gint x1,
gint y1,
gint x2,
gint y2)
{
gint x3, y3, x4, y4;
PixelRegion bPR;
g_return_val_if_fail (GIMP_IS_CHANNEL (mask), FALSE);
g_return_val_if_fail (segs_in != NULL, FALSE);
g_return_val_if_fail (segs_out != NULL, FALSE);
g_return_val_if_fail (num_segs_in != NULL, FALSE);
g_return_val_if_fail (num_segs_out != NULL, FALSE);
if (! mask->boundary_known)
{
/* free the out of date boundary segments */
if (mask->segs_in)
g_free (mask->segs_in);
if (mask->segs_out)
g_free (mask->segs_out);
if (gimp_channel_bounds (mask, &x3, &y3, &x4, &y4))
{
pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles,
x3, y3, (x4 - x3), (y4 - y3), FALSE);
mask->segs_out = find_mask_boundary (&bPR, &mask->num_segs_out,
IgnoreBounds,
x1, y1,
x2, y2);
x1 = MAX (x1, x3);
y1 = MAX (y1, y3);
x2 = MIN (x2, x4);
y2 = MIN (y2, y4);
if (x2 > x1 && y2 > y1)
{
pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, FALSE);
mask->segs_in = find_mask_boundary (&bPR, &mask->num_segs_in,
WithinBounds,
x1, y1,
x2, y2);
}
else
{
mask->segs_in = NULL;
mask->num_segs_in = 0;
}
}
else
{
mask->segs_in = NULL;
mask->segs_out = NULL;
mask->num_segs_in = 0;
mask->num_segs_out = 0;
}
mask->boundary_known = TRUE;
}
*segs_in = mask->segs_in;
*segs_out = mask->segs_out;
*num_segs_in = mask->num_segs_in;
*num_segs_out = mask->num_segs_out;
return TRUE;
}
gint
gimp_channel_value (GimpChannel *mask,
gint x,
gint y)
{
Tile *tile;
gint val;
g_return_val_if_fail (GIMP_IS_CHANNEL (mask), 0);
/* Some checks to cut back on unnecessary work */
if (mask->bounds_known)
{
if (mask->empty)
return 0;
else if (x < mask->x1 || x >= mask->x2 || y < mask->y1 || y >= mask->y2)
return 0;
}
else
{
if (x < 0 || x >= GIMP_DRAWABLE (mask)->width ||
y < 0 || y >= GIMP_DRAWABLE (mask)->height)
return 0;
}
tile = tile_manager_get_tile (GIMP_DRAWABLE (mask)->tiles, x, y, TRUE, FALSE);
val = *(guchar *) (tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT));
tile_release (tile, FALSE);
return val;
}
gboolean
gimp_channel_bounds (GimpChannel *mask,
gint *x1,
gint *y1,
gint *x2,
gint *y2)
{
PixelRegion maskPR;
guchar *data, *data1;
gint x, y;
gint ex, ey;
gint tx1, tx2, ty1, ty2;
gint minx, maxx;
gpointer pr;
g_return_val_if_fail (GIMP_IS_CHANNEL (mask), FALSE);
g_return_val_if_fail (x1 != NULL, FALSE);
g_return_val_if_fail (y1 != NULL, FALSE);
g_return_val_if_fail (x2 != NULL, FALSE);
g_return_val_if_fail (y2 != NULL, FALSE);
/* if the mask's bounds have already been reliably calculated... */
if (mask->bounds_known)
{
*x1 = mask->x1;
*y1 = mask->y1;
*x2 = mask->x2;
*y2 = mask->y2;
return ! mask->empty;
}
/* go through and calculate the bounds */
tx1 = GIMP_DRAWABLE (mask)->width;
ty1 = GIMP_DRAWABLE (mask)->height;
tx2 = 0;
ty2 = 0;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, FALSE);
for (pr = pixel_regions_register (1, &maskPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
data1 = data = maskPR.data;
ex = maskPR.x + maskPR.w;
ey = maskPR.y + maskPR.h;
/* only check the pixels if this tile is not fully within the currently
computed bounds */
if (maskPR.x < tx1 || ex > tx2 ||
maskPR.y < ty1 || ey > ty2)
{
/* Check upper left and lower right corners to see if we can
avoid checking the rest of the pixels in this tile */
if (data[0] && data[maskPR.rowstride*(maskPR.h - 1) + maskPR.w - 1])
{
if (maskPR.x < tx1)
tx1 = maskPR.x;
if (ex > tx2)
tx2 = ex;
if (maskPR.y < ty1)
ty1 = maskPR.y;
if (ey > ty2)
ty2 = ey;
}
else
{
for (y = maskPR.y; y < ey; y++, data1 += maskPR.rowstride)
{
for (x = maskPR.x, data = data1; x < ex; x++, data++)
{
if (*data)
{
minx = x;
maxx = x;
for (; x < ex; x++, data++)
if (*data)
maxx = x;
if (minx < tx1)
tx1 = minx;
if (maxx > tx2)
tx2 = maxx;
if (y < ty1)
ty1 = y;
if (y > ty2)
ty2 = y;
}
}
}
}
}
}
tx2 = CLAMP (tx2 + 1, 0, GIMP_DRAWABLE (mask)->width);
ty2 = CLAMP (ty2 + 1, 0, GIMP_DRAWABLE (mask)->height);
if (tx1 == GIMP_DRAWABLE (mask)->width && ty1 == GIMP_DRAWABLE (mask)->height)
{
mask->empty = TRUE;
mask->x1 = 0;
mask->y1 = 0;
mask->x2 = GIMP_DRAWABLE (mask)->width;
mask->y2 = GIMP_DRAWABLE (mask)->height;
}
else
{
mask->empty = FALSE;
mask->x1 = tx1;
mask->y1 = ty1;
mask->x2 = tx2;
mask->y2 = ty2;
}
mask->bounds_known = TRUE;
*x1 = tx1;
*x2 = tx2;
*y1 = ty1;
*y2 = ty2;
return !mask->empty;
}
gboolean
gimp_channel_is_empty (GimpChannel *mask)
{
PixelRegion maskPR;
guchar *data;
gint x, y;
gpointer pr;
g_return_val_if_fail (GIMP_IS_CHANNEL (mask), FALSE);
if (mask->bounds_known)
return mask->empty;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, FALSE);
for (pr = pixel_regions_register (1, &maskPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
/* check if any pixel in the mask is non-zero */
data = maskPR.data;
for (y = 0; y < maskPR.h; y++)
for (x = 0; x < maskPR.w; x++)
if (*data++)
{
pixel_regions_process_stop (pr);
return FALSE;
}
}
/* The mask is empty, meaning we can set the bounds as known */
if (mask->segs_in)
g_free (mask->segs_in);
if (mask->segs_out)
g_free (mask->segs_out);
mask->empty = TRUE;
mask->segs_in = NULL;
mask->segs_out = NULL;
mask->num_segs_in = 0;
mask->num_segs_out = 0;
mask->bounds_known = TRUE;
mask->boundary_known = TRUE;
mask->x1 = 0;
mask->y1 = 0;
mask->x2 = GIMP_DRAWABLE (mask)->width;
mask->y2 = GIMP_DRAWABLE (mask)->height;
return TRUE;
}
void
gimp_channel_add_segment (GimpChannel *mask,
gint x,
gint y,
gint width,
gint value)
{
PixelRegion maskPR;
guchar *data;
gint val;
gint x2;
gpointer pr;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
/* check horizontal extents... */
x2 = x + width;
x2 = CLAMP (x2, 0, GIMP_DRAWABLE (mask)->width);
x = CLAMP (x, 0, GIMP_DRAWABLE (mask)->width);
width = x2 - x;
if (!width)
return;
if (y < 0 || y > GIMP_DRAWABLE (mask)->height)
return;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
x, y, width, 1, TRUE);
for (pr = pixel_regions_register (1, &maskPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
data = maskPR.data;
width = maskPR.w;
while (width--)
{
val = *data + value;
if (val > 255)
val = 255;
*data++ = val;
}
}
}
void
gimp_channel_sub_segment (GimpChannel *mask,
gint x,
gint y,
gint width,
gint value)
{
PixelRegion maskPR;
guchar *data;
gint val;
gint x2;
gpointer pr;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
/* check horizontal extents... */
x2 = x + width;
x2 = CLAMP (x2, 0, GIMP_DRAWABLE (mask)->width);
x = CLAMP (x, 0, GIMP_DRAWABLE (mask)->width);
width = x2 - x;
if (! width)
return;
if (y < 0 || y > GIMP_DRAWABLE (mask)->height)
return;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
x, y, width, 1, TRUE);
for (pr = pixel_regions_register (1, &maskPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
data = maskPR.data;
width = maskPR.w;
while (width--)
{
val = *data - value;
if (val < 0)
val = 0;
*data++ = val;
}
}
}
void
gimp_channel_combine_rect (GimpChannel *mask,
GimpChannelOps op,
gint x,
gint y,
gint w,
gint h)
{
gint x2, y2;
PixelRegion maskPR;
guchar color;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
y2 = y + h;
x2 = x + w;
x = CLAMP (x, 0, GIMP_DRAWABLE (mask)->width);
y = CLAMP (y, 0, GIMP_DRAWABLE (mask)->height);
x2 = CLAMP (x2, 0, GIMP_DRAWABLE (mask)->width);
y2 = CLAMP (y2, 0, GIMP_DRAWABLE (mask)->height);
if (x2 - x <= 0 || y2 - y <= 0)
return;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
x, y, x2 - x, y2 - y, TRUE);
if (op == GIMP_CHANNEL_OP_ADD || op == GIMP_CHANNEL_OP_REPLACE)
color = OPAQUE_OPACITY;
else
color = TRANSPARENT_OPACITY;
color_region (&maskPR, &color);
/* Determine new boundary */
if (mask->bounds_known && (op == GIMP_CHANNEL_OP_ADD) && !mask->empty)
{
if (x < mask->x1)
mask->x1 = x;
if (y < mask->y1)
mask->y1 = y;
if ((x + w) > mask->x2)
mask->x2 = (x + w);
if ((y + h) > mask->y2)
mask->y2 = (y + h);
}
else if (op == GIMP_CHANNEL_OP_REPLACE || mask->empty)
{
mask->empty = FALSE;
mask->x1 = x;
mask->y1 = y;
mask->x2 = x + w;
mask->y2 = y + h;
}
else
mask->bounds_known = FALSE;
mask->x1 = CLAMP (mask->x1, 0, GIMP_DRAWABLE (mask)->width);
mask->y1 = CLAMP (mask->y1, 0, GIMP_DRAWABLE (mask)->height);
mask->x2 = CLAMP (mask->x2, 0, GIMP_DRAWABLE (mask)->width);
mask->y2 = CLAMP (mask->y2, 0, GIMP_DRAWABLE (mask)->height);
}
void
gimp_channel_combine_ellipse (GimpChannel *mask,
GimpChannelOps op,
gint x,
gint y,
gint w,
gint h,
gboolean antialias)
{
gint i, j;
gint x0, x1, x2;
gint val, last;
gfloat a_sqr, b_sqr, aob_sqr;
gfloat w_sqr, h_sqr;
gfloat y_sqr;
gfloat t0, t1;
gfloat r;
gfloat cx, cy;
gfloat rad;
gfloat dist;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (!w || !h)
return;
a_sqr = (w * w / 4.0);
b_sqr = (h * h / 4.0);
aob_sqr = a_sqr / b_sqr;
cx = x + w / 2.0;
cy = y + h / 2.0;
for (i = y; i < (y + h); i++)
{
if (i >= 0 && i < GIMP_DRAWABLE (mask)->height)
{
/* Non-antialiased code */
if (!antialias)
{
y_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
rad = sqrt (a_sqr - a_sqr * y_sqr / (double) b_sqr);
x1 = ROUND (cx - rad);
x2 = ROUND (cx + rad);
switch (op)
{
case GIMP_CHANNEL_OP_ADD:
case GIMP_CHANNEL_OP_REPLACE:
gimp_channel_add_segment (mask, x1, i, (x2 - x1), 255);
break;
case GIMP_CHANNEL_OP_SUBTRACT:
gimp_channel_sub_segment (mask, x1, i, (x2 - x1), 255);
break;
default:
g_warning ("Only ADD, REPLACE, and SUBTRACT are valid for channel_combine!");
break;
}
}
/* antialiasing */
else
{
x0 = x;
last = 0;
h_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
for (j = x; j < (x + w); j++)
{
w_sqr = (j + 0.5 - cx) * (j + 0.5 - cx);
if (h_sqr != 0)
{
t0 = w_sqr / h_sqr;
t1 = a_sqr / (t0 + aob_sqr);
r = sqrt (t1 + t0 * t1);
rad = sqrt (w_sqr + h_sqr);
dist = rad - r;
}
else
dist = -1.0;
if (dist < -0.5)
val = 255;
else if (dist < 0.5)
val = (int) (255 * (1 - (dist + 0.5)));
else
val = 0;
if (last != val && last)
{
switch (op)
{
case GIMP_CHANNEL_OP_ADD:
case GIMP_CHANNEL_OP_REPLACE:
gimp_channel_add_segment (mask, x0, i, j - x0, last);
break;
case GIMP_CHANNEL_OP_SUBTRACT:
gimp_channel_sub_segment (mask, x0, i, j - x0, last);
break;
default:
g_warning ("Only ADD, REPLACE, and SUBTRACT are valid for channel_combine!");
break;
}
}
if (last != val)
{
x0 = j;
last = val;
/* because we are symetric accross the y axis we can
skip ahead a bit if we are inside the ellipse*/
if (val == 255 && j < cx)
j = cx + (cx - j) - 1;
}
}
if (last)
{
switch (op)
{
case GIMP_CHANNEL_OP_ADD:
case GIMP_CHANNEL_OP_REPLACE:
gimp_channel_add_segment (mask, x0, i, j - x0, last);
break;
case GIMP_CHANNEL_OP_SUBTRACT:
gimp_channel_sub_segment (mask, x0, i, j - x0, last);
break;
default:
g_warning ("Only ADD, REPLACE, and SUBTRACT are valid for channel_combine!");
break;
}
}
}
}
}
/* Determine new boundary */
if (mask->bounds_known && (op == GIMP_CHANNEL_OP_ADD) && !mask->empty)
{
if (x < mask->x1)
mask->x1 = x;
if (y < mask->y1)
mask->y1 = y;
if ((x + w) > mask->x2)
mask->x2 = (x + w);
if ((y + h) > mask->y2)
mask->y2 = (y + h);
}
else if (op == GIMP_CHANNEL_OP_REPLACE || mask->empty)
{
mask->empty = FALSE;
mask->x1 = x;
mask->y1 = y;
mask->x2 = x + w;
mask->y2 = y + h;
}
else
mask->bounds_known = FALSE;
mask->x1 = CLAMP (mask->x1, 0, GIMP_DRAWABLE (mask)->width);
mask->y1 = CLAMP (mask->y1, 0, GIMP_DRAWABLE (mask)->height);
mask->x2 = CLAMP (mask->x2, 0, GIMP_DRAWABLE (mask)->width);
mask->y2 = CLAMP (mask->y2, 0, GIMP_DRAWABLE (mask)->height);
}
static void
gimp_channel_combine_sub_region_add (gpointer unused,
PixelRegion *srcPR,
PixelRegion *destPR)
{
guchar *src, *dest;
gint x, y, val;
src = srcPR->data;
dest = destPR->data;
for (y = 0; y < srcPR->h; y++)
{
for (x = 0; x < srcPR->w; x++)
{
val = dest[x] + src[x];
if (val > 255)
dest[x] = 255;
else
dest[x] = val;
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
static void
gimp_channel_combine_sub_region_sub (gpointer unused,
PixelRegion *srcPR,
PixelRegion *destPR)
{
guchar *src, *dest;
gint x, y;
src = srcPR->data;
dest = destPR->data;
for (y = 0; y < srcPR->h; y++)
{
for (x = 0; x < srcPR->w; x++)
{
if (src[x] > dest[x])
dest[x] = 0;
else
dest[x]-= src[x];
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
static void
gimp_channel_combine_sub_region_intersect (gpointer unused,
PixelRegion *srcPR,
PixelRegion *destPR)
{
guchar *src, *dest;
gint x, y;
src = srcPR->data;
dest = destPR->data;
for (y = 0; y < srcPR->h; y++)
{
for (x = 0; x < srcPR->w; x++)
{
dest[x] = MIN (dest[x], src[x]);
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
void
gimp_channel_combine_mask (GimpChannel *mask,
GimpChannel *add_on,
GimpChannelOps op,
gint off_x,
gint off_y)
{
PixelRegion srcPR, destPR;
gint x1, y1, x2, y2;
gint w, h;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
g_return_if_fail (GIMP_IS_CHANNEL (add_on));
x1 = CLAMP (off_x, 0, GIMP_DRAWABLE (mask)->width);
y1 = CLAMP (off_y, 0, GIMP_DRAWABLE (mask)->height);
x2 = CLAMP (off_x + GIMP_DRAWABLE (add_on)->width, 0,
GIMP_DRAWABLE (mask)->width);
y2 = CLAMP (off_y + GIMP_DRAWABLE (add_on)->height, 0,
GIMP_DRAWABLE (mask)->height);
w = (x2 - x1);
h = (y2 - y1);
pixel_region_init (&srcPR, GIMP_DRAWABLE (add_on)->tiles,
(x1 - off_x), (y1 - off_y), w, h, FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
x1, y1, w, h, TRUE);
switch (op)
{
case GIMP_CHANNEL_OP_ADD:
case GIMP_CHANNEL_OP_REPLACE:
pixel_regions_process_parallel ((p_func)
gimp_channel_combine_sub_region_add,
NULL, 2, &srcPR, &destPR);
break;
case GIMP_CHANNEL_OP_SUBTRACT:
pixel_regions_process_parallel ((p_func)
gimp_channel_combine_sub_region_sub,
NULL, 2, &srcPR, &destPR);
break;
case GIMP_CHANNEL_OP_INTERSECT:
pixel_regions_process_parallel ((p_func)
gimp_channel_combine_sub_region_intersect,
NULL, 2, &srcPR, &destPR);
break;
default:
g_warning ("%s: unknown operation type\n", G_GNUC_PRETTY_FUNCTION);
break;
}
mask->bounds_known = FALSE;
}
void
gimp_channel_feather (GimpChannel *mask,
gdouble radius_x,
gdouble radius_y,
gboolean push_undo)
{
PixelRegion srcPR;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (push_undo)
gimp_channel_push_undo (mask, _("Feather Channel"));
pixel_region_init (&srcPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
gimp_drawable_width (GIMP_DRAWABLE (mask)),
gimp_drawable_height (GIMP_DRAWABLE (mask)),
FALSE);
gaussian_blur_region (&srcPR, radius_x, radius_y);
mask->bounds_known = FALSE;
}
void
gimp_channel_sharpen (GimpChannel *mask,
gboolean push_undo)
{
PixelRegion maskPR;
GimpLut *lut;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (push_undo)
gimp_channel_push_undo (mask, _("Sharpen Channel"));
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, TRUE);
lut = threshold_lut_new (0.5, 1);
pixel_regions_process_parallel ((p_func) gimp_lut_process_inline,
lut, 1, &maskPR);
gimp_lut_free (lut);
mask->bounds_known = FALSE;
}
void
gimp_channel_clear (GimpChannel *mask,
gboolean push_undo)
{
PixelRegion maskPR;
guchar bg = TRANSPARENT_OPACITY;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (push_undo)
gimp_channel_push_undo (mask, _("Clear Channel"));
if (mask->bounds_known && !mask->empty)
{
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
mask->x1, mask->y1,
(mask->x2 - mask->x1), (mask->y2 - mask->y1), TRUE);
color_region (&maskPR, &bg);
}
else
{
/* clear the mask */
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, TRUE);
color_region (&maskPR, &bg);
}
/* we know the bounds */
mask->bounds_known = TRUE;
mask->empty = TRUE;
mask->x1 = 0;
mask->y1 = 0;
mask->x2 = GIMP_DRAWABLE (mask)->width;
mask->y2 = GIMP_DRAWABLE (mask)->height;
}
void
gimp_channel_all (GimpChannel *mask,
gboolean push_undo)
{
PixelRegion maskPR;
guchar bg = OPAQUE_OPACITY;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (push_undo)
gimp_channel_push_undo (mask, _("Fill Channel"));
/* clear the mask */
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, TRUE);
color_region (&maskPR, &bg);
/* we know the bounds */
mask->bounds_known = TRUE;
mask->empty = FALSE;
mask->x1 = 0;
mask->y1 = 0;
mask->x2 = GIMP_DRAWABLE (mask)->width;
mask->y2 = GIMP_DRAWABLE (mask)->height;
}
void
gimp_channel_invert (GimpChannel *mask,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (push_undo)
gimp_channel_push_undo (mask, _("Invert Channel"));
if (mask->bounds_known && mask->empty)
{
gimp_channel_all (mask, FALSE);
}
else
{
PixelRegion maskPR;
GimpLut *lut;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, TRUE);
lut = invert_lut_new (1);
pixel_regions_process_parallel ((p_func) gimp_lut_process_inline, lut,
1, &maskPR);
gimp_lut_free (lut);
mask->bounds_known = FALSE;
}
}
void
gimp_channel_border (GimpChannel *mask,
gint radius_x,
gint radius_y,
gboolean push_undo)
{
PixelRegion bPR;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (radius_x < 0 || radius_y < 0)
return;
if (! gimp_channel_bounds (mask, &x1, &y1, &x2, &y2))
return;
if (gimp_channel_is_empty (mask))
return;
if (x1 - radius_x < 0)
x1 = 0;
else
x1 -= radius_x;
if (x2 + radius_x > GIMP_DRAWABLE (mask)->width)
x2 = GIMP_DRAWABLE (mask)->width;
else
x2 += radius_x;
if (y1 - radius_y < 0)
y1 = 0;
else
y1 -= radius_y;
if (y2 + radius_y > GIMP_DRAWABLE (mask)->height)
y2 = GIMP_DRAWABLE (mask)->height;
else
y2 += radius_y;
if (push_undo)
gimp_channel_push_undo (mask, _("Border Channel"));
pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles, x1, y1,
(x2-x1), (y2-y1), TRUE);
border_region (&bPR, radius_x, radius_y);
mask->bounds_known = FALSE;
}
void
gimp_channel_grow (GimpChannel *mask,
gint radius_x,
gint radius_y,
gboolean push_undo)
{
PixelRegion bPR;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (radius_x == 0 && radius_y == 0)
return;
if (radius_x <= 0 && radius_y <= 0)
{
gimp_channel_shrink (mask, -radius_x, -radius_y, FALSE, push_undo);
return;
}
if (radius_x < 0 || radius_y < 0)
return;
if (! gimp_channel_bounds (mask, &x1, &y1, &x2, &y2))
return;
if (gimp_channel_is_empty (mask))
return;
if (x1 - radius_x > 0)
x1 = x1 - radius_x;
else
x1 = 0;
if (y1 - radius_y > 0)
y1 = y1 - radius_y;
else
y1 = 0;
if (x2 + radius_x < GIMP_DRAWABLE (mask)->width)
x2 = x2 + radius_x;
else
x2 = GIMP_DRAWABLE (mask)->width;
if (y2 + radius_y < GIMP_DRAWABLE (mask)->height)
y2 = y2 + radius_y;
else
y2 = GIMP_DRAWABLE (mask)->height;
if (push_undo)
gimp_channel_push_undo (mask, _("Grow Channel"));
/* need full extents for grow, not! */
pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles, x1, y1, (x2 - x1),
(y2 - y1), TRUE);
fatten_region (&bPR, radius_x, radius_y);
mask->bounds_known = FALSE;
}
void
gimp_channel_shrink (GimpChannel *mask,
gint radius_x,
gint radius_y,
gboolean edge_lock,
gboolean push_undo)
{
PixelRegion bPR;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (radius_x == 0 && radius_y == 0)
return;
if (radius_x <= 0 && radius_y <= 0)
{
gimp_channel_grow (mask, -radius_x, -radius_y, push_undo);
return;
}
if (radius_x < 0 || radius_y < 0)
return;
if (! gimp_channel_bounds (mask, &x1, &y1, &x2, &y2))
return;
if (gimp_channel_is_empty (mask))
return;
if (x1 > 0)
x1--;
if (y1 > 0)
y1--;
if (x2 < GIMP_DRAWABLE (mask)->width)
x2++;
if (y2 < GIMP_DRAWABLE (mask)->height)
y2++;
if (push_undo)
gimp_channel_push_undo (mask, _("Shrink Channel"));
pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles, x1, y1, (x2 - x1),
(y2 - y1), TRUE);
thin_region (&bPR, radius_x, radius_y, edge_lock);
mask->bounds_known = FALSE;
}
void
gimp_channel_translate (GimpChannel *mask,
gint off_x,
gint off_y,
gboolean push_undo)
{
GimpChannel *tmp_mask = NULL;
gint width, height;
PixelRegion srcPR, destPR;
guchar empty = TRANSPARENT_OPACITY;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
if (push_undo)
gimp_channel_push_undo (mask, _("Translate Channel"));
gimp_channel_bounds (mask, &x1, &y1, &x2, &y2);
x1 = CLAMP ((x1 + off_x), 0, GIMP_DRAWABLE (mask)->width);
y1 = CLAMP ((y1 + off_y), 0, GIMP_DRAWABLE (mask)->height);
x2 = CLAMP ((x2 + off_x), 0, GIMP_DRAWABLE (mask)->width);
y2 = CLAMP ((y2 + off_y), 0, GIMP_DRAWABLE (mask)->height);
width = x2 - x1;
height = y2 - y1;
/* make sure width and height are non-zero */
if (width != 0 && height != 0)
{
/* copy the portion of the mask we will keep to a
* temporary buffer
*/
tmp_mask = gimp_channel_new_mask (gimp_item_get_image (GIMP_ITEM (mask)),
width, height);
pixel_region_init (&srcPR, GIMP_DRAWABLE (mask)->tiles,
x1 - off_x, y1 - off_y, width, height, FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (tmp_mask)->tiles,
0, 0, width, height, TRUE);
copy_region (&srcPR, &destPR);
}
/* clear the mask */
pixel_region_init (&srcPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width,
GIMP_DRAWABLE (mask)->height, TRUE);
color_region (&srcPR, &empty);
if (width != 0 && height != 0)
{
/* copy the temp mask back to the mask */
pixel_region_init (&srcPR, GIMP_DRAWABLE (tmp_mask)->tiles,
0, 0, width, height, FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
x1, y1, width, height, TRUE);
copy_region (&srcPR, &destPR);
/* free the temporary mask */
g_object_unref (tmp_mask);
}
/* calculate new bounds */
if (width == 0 || height == 0)
{
mask->empty = TRUE;
mask->x1 = 0;
mask->y1 = 0;
mask->x2 = GIMP_DRAWABLE (mask)->width;
mask->y2 = GIMP_DRAWABLE (mask)->height;
}
else
{
mask->x1 = x1;
mask->y1 = y1;
mask->x2 = x2;
mask->y2 = y2;
}
}
void
gimp_channel_load (GimpChannel *mask,
GimpChannel *channel,
gboolean push_undo)
{
PixelRegion srcPR, destPR;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
g_return_if_fail (GIMP_IS_CHANNEL (channel));
if (push_undo)
gimp_channel_push_undo (mask, _("Channel Load"));
/* copy the channel to the mask */
pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height, FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (channel)->width,
GIMP_DRAWABLE (channel)->height, TRUE);
copy_region (&srcPR, &destPR);
mask->bounds_known = FALSE;
}
void
gimp_channel_layer_alpha (GimpChannel *mask,
GimpLayer *layer,
gboolean push_undo)
{
PixelRegion srcPR, destPR;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)));
if (push_undo)
gimp_channel_push_undo (mask, _("Channel from Alpha"));
/* clear the mask if it is not already known to be empty */
if (! (mask->bounds_known && mask->empty))
gimp_channel_clear (mask, FALSE);
x1 = CLAMP (GIMP_DRAWABLE (layer)->offset_x, 0, GIMP_DRAWABLE (mask)->width);
y1 = CLAMP (GIMP_DRAWABLE (layer)->offset_y, 0, GIMP_DRAWABLE (mask)->height);
x2 = CLAMP (GIMP_DRAWABLE (layer)->offset_x + GIMP_DRAWABLE (layer)->width,
0, GIMP_DRAWABLE (mask)->width);
y2 = CLAMP (GIMP_DRAWABLE( layer)->offset_y + GIMP_DRAWABLE (layer)->height,
0, GIMP_DRAWABLE (mask)->height);
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
(x1 - GIMP_DRAWABLE (layer)->offset_x),
(y1 - GIMP_DRAWABLE (layer)->offset_y),
(x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
x1, y1, (x2 - x1), (y2 - y1), TRUE);
extract_alpha_region (&srcPR, NULL, &destPR);
mask->bounds_known = FALSE;
}
void
gimp_channel_layer_mask (GimpChannel *mask,
GimpLayer *layer,
gboolean push_undo)
{
PixelRegion srcPR, destPR;
gint x1, y1, x2, y2;
g_return_if_fail (GIMP_IS_CHANNEL (mask));
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_layer_get_mask (layer));
if (push_undo)
gimp_channel_push_undo (mask, _("Channel from Mask"));
/* clear the mask if it is not already known to be empty */
if (! (mask->bounds_known && mask->empty))
gimp_channel_clear (mask, FALSE);
x1 = CLAMP (GIMP_DRAWABLE (layer)->offset_x, 0, GIMP_DRAWABLE (mask)->width);
y1 = CLAMP (GIMP_DRAWABLE (layer)->offset_y, 0, GIMP_DRAWABLE (mask)->height);
x2 = CLAMP (GIMP_DRAWABLE (layer)->offset_x + GIMP_DRAWABLE (layer)->width,
0, GIMP_DRAWABLE (mask)->width);
y2 = CLAMP (GIMP_DRAWABLE (layer)->offset_y + GIMP_DRAWABLE (layer)->height,
0, GIMP_DRAWABLE (mask)->height);
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer->mask)->tiles,
(x1 - GIMP_DRAWABLE (layer)->offset_x),
(y1 - GIMP_DRAWABLE (layer)->offset_y),
(x2 - x1), (y2 - y1),
FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
x1, y1,
(x2 - x1), (y2 - y1),
TRUE);
copy_region (&srcPR, &destPR);
mask->bounds_known = FALSE;
}
void
gimp_channel_invalidate_bounds (GimpChannel *channel)
{
g_return_if_fail (GIMP_IS_CHANNEL (channel));
channel->bounds_known = FALSE;
}
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