mirror of https://github.com/GNOME/gimp.git
161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "base-types.h"
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#include "paint-funcs/paint-funcs.h"
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#include "pixel-region.h"
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#include "tile-manager.h"
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#include "tile-manager-crop.h"
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/* Crop the buffer to the size of pixels with non-zero transparency */
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TileManager *
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tile_manager_crop (TileManager *tiles,
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gint border)
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{
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PixelRegion region;
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TileManager *new_tiles;
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gint bytes, alpha;
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gint x1, y1, x2, y2;
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gboolean found;
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gboolean empty;
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gpointer pr;
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g_return_val_if_fail (tiles != NULL, NULL);
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bytes = tile_manager_bpp (tiles);
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alpha = bytes - 1;
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/* go through and calculate the bounds */
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x1 = tile_manager_width (tiles);
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y1 = tile_manager_height (tiles);
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x2 = 0;
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y2 = 0;
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pixel_region_init (®ion, tiles, 0, 0, x1, y1, FALSE);
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for (pr = pixel_regions_register (1, ®ion);
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pr != NULL;
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pr = pixel_regions_process (pr))
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{
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const guchar *data = region.data + alpha;
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gint ex = region.x + region.w;
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gint ey = region.y + region.h;
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gint x, y;
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for (y = region.y; y < ey; y++)
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{
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found = FALSE;
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for (x = region.x; x < ex; x++, data += bytes)
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if (*data)
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{
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if (x < x1)
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x1 = x;
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if (x > x2)
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x2 = x;
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found = TRUE;
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}
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if (found)
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{
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if (y < y1)
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y1 = y;
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if (y > y2)
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y2 = y;
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}
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}
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}
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x2 = CLAMP (x2 + 1, 0, tile_manager_width (tiles));
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y2 = CLAMP (y2 + 1, 0, tile_manager_height (tiles));
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empty = (x1 == tile_manager_width (tiles) &&
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y1 == tile_manager_height (tiles));
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if (empty)
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{
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/* If there are no visible pixels, return NULL */
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new_tiles = NULL;
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}
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else if (x1 == 0 && y1 == 0 &&
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x2 == tile_manager_width (tiles) &&
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y2 == tile_manager_height (tiles) &&
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border == 0)
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{
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/* If no cropping, return original buffer */
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new_tiles = tiles;
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}
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else
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{
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/* Otherwise, crop the original area */
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PixelRegion srcPR, destPR;
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gint new_width, new_height;
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new_width = (x2 - x1) + border * 2;
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new_height = (y2 - y1) + border * 2;
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new_tiles = tile_manager_new (new_width, new_height, bytes);
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/* If there is a border, make sure to clear the new tiles first */
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if (border)
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{
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pixel_region_init (&destPR, new_tiles,
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0, 0, new_width, border,
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TRUE);
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clear_region (&destPR);
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pixel_region_init (&destPR, new_tiles,
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0, border, border, (y2 - y1),
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TRUE);
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clear_region (&destPR);
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pixel_region_init (&destPR, new_tiles,
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new_width - border, border, border, (y2 - y1),
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TRUE);
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clear_region (&destPR);
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pixel_region_init (&destPR, new_tiles,
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0, new_height - border, new_width, border,
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TRUE);
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clear_region (&destPR);
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}
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pixel_region_init (&srcPR, tiles,
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x1, y1, (x2 - x1), (y2 - y1), FALSE);
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pixel_region_init (&destPR, new_tiles,
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border, border, (x2 - x1), (y2 - y1), TRUE);
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copy_region (&srcPR, &destPR);
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tile_manager_set_offsets (new_tiles, x1, y1);
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}
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return new_tiles;
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}
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