mirror of https://github.com/GNOME/gimp.git
149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995-2001 Spencer Kimball, Peter Mattis, and others
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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 "pixel-region.h"
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#include "pixel-surround.h"
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#include "tile-manager.h"
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#include "tile.h"
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void
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pixel_surround_init (PixelSurround *ps,
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TileManager *tm,
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gint w,
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gint h,
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guchar bg[MAX_CHANNELS])
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{
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gint i;
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for (i = 0; i < MAX_CHANNELS; ++i)
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{
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ps->bg[i] = bg[i];
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}
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ps->tile = NULL;
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ps->mgr = tm;
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ps->bpp = tile_manager_bpp (tm);
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ps->w = w;
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ps->h = h;
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/* make sure buffer is big enough */
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ps->buff_size = w * h * ps->bpp;
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ps->buff = g_new (guchar, ps->buff_size);
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ps->row_stride = 0;
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}
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guchar *
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pixel_surround_lock (PixelSurround *ps,
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gint x,
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gint y)
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{
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gint i, j;
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guchar *k;
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guchar *ptr;
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ps->tile = tile_manager_get_tile (ps->mgr, x, y, TRUE, FALSE);
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i = x % TILE_WIDTH;
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j = y % TILE_HEIGHT;
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/* do we have the whole region? */
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if (ps->tile &&
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(i < (tile_ewidth(ps->tile) - ps->w)) &&
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(j < (tile_eheight(ps->tile) - ps->h)))
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{
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ps->row_stride = tile_ewidth (ps->tile) * ps->bpp;
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/* is this really the correct way? */
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return tile_data_pointer (ps->tile, i, j);
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}
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/* nope, do this the hard way (for now) */
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if (ps->tile)
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{
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tile_release (ps->tile, FALSE);
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ps->tile = 0;
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}
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/* copy pixels, one by one */
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/* no, this is not the best way, but it's much better than before */
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ptr = ps->buff;
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for (j = y; j < y+ps->h; ++j)
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{
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for (i = x; i < x+ps->w; ++i)
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{
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Tile *tile = tile_manager_get_tile (ps->mgr, i, j, TRUE, FALSE);
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if (tile)
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{
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guchar *buff = tile_data_pointer (tile,
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i % TILE_WIDTH,
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j % TILE_HEIGHT);
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for (k = buff; k < buff+ps->bpp; ++k, ++ptr)
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{
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*ptr = *k;
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}
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tile_release (tile, FALSE);
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}
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else
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{
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for (k = ps->bg; k < ps->bg+ps->bpp; ++k, ++ptr)
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{
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*ptr = *k;
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}
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}
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}
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}
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ps->row_stride = ps->w * ps->bpp;
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return ps->buff;
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}
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gint
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pixel_surround_rowstride (PixelSurround *ps)
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{
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return ps->row_stride;
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}
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void
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pixel_surround_release (PixelSurround *ps)
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{
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/* always get new tile (for now), so release the old one */
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if (ps->tile)
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{
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tile_release (ps->tile, FALSE);
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ps->tile = 0;
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}
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}
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void
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pixel_surround_clear (PixelSurround *ps)
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{
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if (ps->buff)
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{
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g_free (ps->buff);
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ps->buff = 0;
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ps->buff_size = 0;
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}
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}
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