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