| /* GStreamer |
| * Copyright (C) <2011> Stefan Sauer <ensonic@users.sf.net> |
| * |
| * gstdrawhelpers.h: simple drawing helpers |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, 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_dot_c(_vd, _x, _y, _st, _c) G_STMT_START { \ |
| _vd[(_y * _st) + _x] |= _c; \ |
| } G_STMT_END |
| |
| #define draw_dot_aa(_vd, _x, _y, _st, _c, _f) G_STMT_START { \ |
| guint32 _oc, _c1, _c2, _c3; \ |
| \ |
| _oc = _vd[(_y * _st) + _x]; \ |
| _c3 = (_oc & 0xff) + ((_c & 0xff) * _f); \ |
| _c3 = MIN(_c3, 255); \ |
| _c2 = ((_oc & 0xff00) >> 8) + (((_c & 0xff00) >> 8) * _f); \ |
| _c2 = MIN(_c2, 255); \ |
| _c1 = ((_oc & 0xff0000) >> 16) + (((_c & 0xff0000) >> 16) * _f); \ |
| _c1 = MIN(_c1, 255); \ |
| _vd[(_y * _st) + _x] = (_c1 << 16) | (_c2 << 8) | _c3; \ |
| } 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 |
| |
| #define draw_line_aa(_vd, _x1, _x2, _y1, _y2, _st, _c) G_STMT_START { \ |
| guint _i, _j, _x, _y; \ |
| gint _dx = _x2 - _x1, _dy = _y2 - _y1; \ |
| gfloat _f, _rx, _ry, _fx, _fy; \ |
| \ |
| _j = abs (_dx) > abs (_dy) ? abs (_dx) : abs (_dy); \ |
| for (_i = 0; _i < _j; _i++) { \ |
| _f = (gfloat) _i / (gfloat) _j; \ |
| _rx = _x1 + _dx * _f; \ |
| _ry = _y1 + _dy * _f; \ |
| _x = (guint)_rx; \ |
| _y = (guint)_ry; \ |
| _fx = _rx - (gfloat)_x; \ |
| _fy = _ry - (gfloat)_y; \ |
| \ |
| _f = ((1.0 - _fx) + (1.0 - _fy)) / 2.0; \ |
| draw_dot_aa (_vd, _x, _y, _st, _c, _f); \ |
| \ |
| _f = (_fx + (1.0 - _fy)) / 2.0; \ |
| draw_dot_aa (_vd, (_x + 1), _y, _st, _c, _f); \ |
| \ |
| _f = ((1.0 - _fx) + _fy) / 2.0; \ |
| draw_dot_aa (_vd, _x, (_y + 1), _st, _c, _f); \ |
| \ |
| _f = (_fx + _fy) / 2.0; \ |
| draw_dot_aa (_vd, (_x + 1), (_y + 1), _st, _c, _f); \ |
| } \ |
| } G_STMT_END |
| |
