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gimp/app/core/gimpdrawable-offset.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 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 <string.h>
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/pixel-region.h"
#include "base/tile-manager.h"
#include "paint-funcs/paint-funcs.h"
#include "gimp.h"
#include "gimpcontext.h"
#include "gimpdrawable.h"
#include "gimpdrawable-offset.h"
#include "gimpimage.h"
#include "gimp-intl.h"
void
gimp_drawable_offset (GimpDrawable *drawable,
GimpContext *context,
gboolean wrap_around,
GimpOffsetType fill_type,
gint offset_x,
gint offset_y)
{
GimpItem *item;
PixelRegion srcPR, destPR;
TileManager *new_tiles;
gint width, height;
gint src_x, src_y;
gint dest_x, dest_y;
guchar fill[MAX_CHANNELS] = { 0 };
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (GIMP_IS_CONTEXT (context));
item = GIMP_ITEM (drawable);
width = gimp_item_width (item);
height = gimp_item_height (item);
if (wrap_around)
{
/* avoid modulo operation on negative values */
while (offset_x < 0)
offset_x += width;
while (offset_y < 0)
offset_y += height;
offset_x %= width;
offset_y %= height;
}
else
{
offset_x = CLAMP (offset_x, -width, width);
offset_y = CLAMP (offset_y, -height, height);
}
if (offset_x == 0 && offset_y == 0)
return;
new_tiles = tile_manager_new (width, height, gimp_drawable_bytes (drawable));
if (offset_x >= 0)
{
src_x = 0;
dest_x = offset_x;
width = CLAMP ((width - offset_x), 0, width);
}
else
{
src_x = -offset_x;
dest_x = 0;
width = CLAMP ((width + offset_x), 0, width);
}
if (offset_y >= 0)
{
src_y = 0;
dest_y = offset_y;
height = CLAMP ((height - offset_y), 0, height);
}
else
{
src_y = -offset_y;
dest_y = 0;
height = CLAMP ((height + offset_y), 0, height);
}
/* Copy the center region */
if (width && height)
{
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
src_x, src_y, width, height, FALSE);
pixel_region_init (&destPR, new_tiles,
dest_x, dest_y, width, height, TRUE);
copy_region (&srcPR, &destPR);
}
/* Copy appropriately for wrap around */
if (wrap_around == TRUE)
{
if (offset_x >= 0 && offset_y >= 0)
{
src_x = gimp_item_width (item) - offset_x;
src_y = gimp_item_height (item) - offset_y;
}
else if (offset_x >= 0 && offset_y < 0)
{
src_x = gimp_item_width (item) - offset_x;
src_y = 0;
}
else if (offset_x < 0 && offset_y >= 0)
{
src_x = 0;
src_y = gimp_item_height (item) - offset_y;
}
else if (offset_x < 0 && offset_y < 0)
{
src_x = 0;
src_y = 0;
}
dest_x = (src_x + offset_x) % gimp_item_width (item);
if (dest_x < 0)
dest_x = gimp_item_width (item) + dest_x;
dest_y = (src_y + offset_y) % gimp_item_height (item);
if (dest_y < 0)
dest_y = gimp_item_height (item) + dest_y;
/* intersecting region */
if (offset_x != 0 && offset_y != 0)
{
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
src_x, src_y,
ABS (offset_x), ABS (offset_y),
FALSE);
pixel_region_init (&destPR, new_tiles,
dest_x, dest_y,
ABS (offset_x), ABS (offset_y),
TRUE);
copy_region (&srcPR, &destPR);
}
/* X offset */
if (offset_x != 0)
{
if (offset_y >= 0)
{
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
src_x, 0, ABS (offset_x),
gimp_item_height (item) - ABS (offset_y),
FALSE);
pixel_region_init (&destPR, new_tiles,
dest_x, dest_y + offset_y,
ABS (offset_x),
gimp_item_height (item) - ABS (offset_y),
TRUE);
}
else if (offset_y < 0)
{
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
src_x, src_y - offset_y,
ABS (offset_x),
gimp_item_height (item) - ABS (offset_y),
FALSE);
pixel_region_init (&destPR, new_tiles,
dest_x, 0,
ABS (offset_x),
gimp_item_height (item) - ABS (offset_y),
TRUE);
}
copy_region (&srcPR, &destPR);
}
/* X offset */
if (offset_y != 0)
{
if (offset_x >= 0)
{
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
0, src_y,
gimp_item_width (item) - ABS (offset_x),
ABS (offset_y), FALSE);
pixel_region_init (&destPR, new_tiles, dest_x + offset_x, dest_y,
gimp_item_width (item) - ABS (offset_x),
ABS (offset_y), TRUE);
}
else if (offset_x < 0)
{
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
src_x - offset_x, src_y,
gimp_item_width (item) - ABS (offset_x),
ABS (offset_y), FALSE);
pixel_region_init (&destPR, new_tiles, 0, dest_y,
gimp_item_width (item) - ABS (offset_x),
ABS (offset_y), TRUE);
}
copy_region (&srcPR, &destPR);
}
}
/* Otherwise, fill the vacated regions */
else
{
if (fill_type == GIMP_OFFSET_BACKGROUND)
{
GimpRGB color;
gimp_context_get_background (context, &color);
gimp_rgb_get_uchar (&color, &fill[0], &fill[1], &fill[2]);
if (gimp_drawable_has_alpha (drawable))
fill[gimp_drawable_bytes (drawable) - 1] = OPAQUE_OPACITY;
}
if (offset_x >= 0 && offset_y >= 0)
{
dest_x = 0;
dest_y = 0;
}
else if (offset_x >= 0 && offset_y < 0)
{
dest_x = 0;
dest_y = gimp_item_height (item) + offset_y;
}
else if (offset_x < 0 && offset_y >= 0)
{
dest_x = gimp_item_width (item) + offset_x;
dest_y = 0;
}
else if (offset_x < 0 && offset_y < 0)
{
dest_x = gimp_item_width (item) + offset_x;
dest_y = gimp_item_height (item) + offset_y;
}
/* intersecting region */
if (offset_x != 0 && offset_y != 0)
{
pixel_region_init (&destPR, new_tiles, dest_x, dest_y,
ABS (offset_x), ABS (offset_y), TRUE);
color_region (&destPR, fill);
}
/* X offset */
if (offset_x != 0)
{
if (offset_y >= 0)
pixel_region_init (&destPR, new_tiles,
dest_x, dest_y + offset_y,
ABS (offset_x),
gimp_item_height (item) - ABS (offset_y),
TRUE);
else if (offset_y < 0)
pixel_region_init (&destPR, new_tiles,
dest_x, 0,
ABS (offset_x),
gimp_item_height (item) - ABS (offset_y),
TRUE);
color_region (&destPR, fill);
}
/* X offset */
if (offset_y != 0)
{
if (offset_x >= 0)
pixel_region_init (&destPR, new_tiles,
dest_x + offset_x,
dest_y,
gimp_item_width (item) - ABS (offset_x),
ABS (offset_y),
TRUE);
else if (offset_x < 0)
pixel_region_init (&destPR, new_tiles,
0, dest_y,
gimp_item_width (item) - ABS (offset_x),
ABS (offset_y),
TRUE);
color_region (&destPR, fill);
}
}
gimp_drawable_set_tiles (drawable, gimp_item_is_attached (item),
_("Offset Drawable"), new_tiles);
tile_manager_unref (new_tiles);
}
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