gst/audiovisualizers/gstdrawhelpers.h

   1 /* GStreamer
   2  * Copyright (C) <2011> Stefan Sauer <ensonic@users.sf.net>
   3  *
   4  * gstdrawhelpers.h: simple drawing helpers
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /* FIXME: add versions that don't ignore alpha */
  22
  23 #define draw_dot(_vd, _x, _y, _st, _c) G_STMT_START {                          \
  24   _vd[(_y * _st) + _x] = _c;                                                   \
  25 } G_STMT_END
  26
  27 #define draw_dot_c(_vd, _x, _y, _st, _c) G_STMT_START {                        \
  28   _vd[(_y * _st) + _x] |= _c;                                                  \
  29 } G_STMT_END
  30
  31 #define draw_dot_aa(_vd, _x, _y, _st, _c, _f)  G_STMT_START {                  \
  32   guint32 _oc, _c1, _c2, _c3;                                                  \
  33                                                                                \
  34   _oc = _vd[(_y * _st) + _x];                                                  \
  35   _c3 = (_oc & 0xff) + ((_c & 0xff) * _f);                                     \
  36   _c3 = MIN(_c3, 255);                                                         \
  37   _c2 = ((_oc & 0xff00) >> 8) + (((_c & 0xff00) >> 8) * _f);                   \
  38   _c2 = MIN(_c2, 255);                                                         \
  39   _c1 = ((_oc & 0xff0000) >> 16) + (((_c & 0xff0000) >> 16) * _f);             \
  40   _c1 = MIN(_c1, 255);                                                         \
  41   _vd[(_y * _st) + _x] = (_c1 << 16) | (_c2 << 8) | _c3;                       \
  42 } G_STMT_END
  43
  44 #define draw_line(_vd, _x1, _x2, _y1, _y2, _st, _c) G_STMT_START {             \
  45   guint _i, _j, _x, _y;                                                        \
  46   gint _dx = _x2 - _x1, _dy = _y2 - _y1;                                       \
  47   gfloat _f;                                                                   \
  48                                                                                \
  49   _j = abs (_dx) > abs (_dy) ? abs (_dx) : abs (_dy);                          \
  50   for (_i = 0; _i < _j; _i++) {                                                \
  51     _f = (gfloat) _i / (gfloat) _j;                                            \
  52     _x = _x1 + _dx * _f;                                                       \
  53     _y = _y1 + _dy * _f;                                                       \
  54     draw_dot (_vd, _x, _y, _st, _c);                                           \
  55   }                                                                            \
  56 } G_STMT_END
  57
  58 #define draw_line_aa(_vd, _x1, _x2, _y1, _y2, _st, _c) G_STMT_START {          \
  59   guint _i, _j, _x, _y;                                                        \
  60   gint _dx = _x2 - _x1, _dy = _y2 - _y1;                                       \
  61   gfloat _f, _rx, _ry, _fx, _fy;                                               \
  62                                                                                \
  63   _j = abs (_dx) > abs (_dy) ? abs (_dx) : abs (_dy);                          \
  64   for (_i = 0; _i < _j; _i++) {                                                \
  65     _f = (gfloat) _i / (gfloat) _j;                                            \
  66     _rx = _x1 + _dx * _f;                                                      \
  67     _ry = _y1 + _dy * _f;                                                      \
  68     _x = (guint)_rx;                                                           \
  69     _y = (guint)_ry;                                                           \
  70     _fx = _rx - (gfloat)_x;                                                    \
  71     _fy = _ry - (gfloat)_y;                                                    \
  72                                                                                \
  73     _f = ((1.0 - _fx) + (1.0 - _fy)) / 2.0;                                    \
  74     draw_dot_aa (_vd, _x, _y, _st, _c, _f);                                    \
  75                                                                                \
  76     _f = (_fx + (1.0 - _fy)) / 2.0;                                            \
  77     draw_dot_aa (_vd, (_x + 1), _y, _st, _c, _f);                              \
  78                                                                                \
  79     _f = ((1.0 - _fx) + _fy) / 2.0;                                            \
  80     draw_dot_aa (_vd, _x, (_y + 1), _st, _c, _f);                              \
  81                                                                                \
  82     _f = (_fx + _fy) / 2.0;                                                    \
  83     draw_dot_aa (_vd, (_x + 1), (_y + 1), _st, _c, _f);                        \
  84   }                                                                            \
  85 } G_STMT_END
  86