gstreamer/gst/audiovisualizers/gstdrawhelpers.h

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/* GStreamer
* Copyright (C) <2011> Stefan Sauer <ensonic@users.sf.net>
*
* gstdrawhelpers.h: simple drawing helpers
*
* 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.
*/
/* FIXME: add versions that don't ignore alpha */
#define draw_dot(_vd, _x, _y, _st, _c) G_STMT_START { \
_vd[(_y * _st) + _x] = _c; \
} G_STMT_END
#define draw_line(_vd, _x1, _x2, _y1, _y2, _st, _c) G_STMT_START { \
guint _i, _j, _x, _y; \
gint _dx = _x2 - _x1, _dy = _y2 - _y1; \
gfloat _f; \
\
_j = abs (_dx) > abs (_dy) ? abs (_dx) : abs (_dy); \
for (_i = 0; _i < _j; _i++) { \
_f = (gfloat) _i / (gfloat) _j; \
_x = _x1 + _dx * _f; \
_y = _y1 + _dy * _f; \
draw_dot (_vd, _x, _y, _st, _c); \
} \
} G_STMT_END