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