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125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//----------------------------------------------------------------------------
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#include "agg_renderer_outline_aa.h"
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namespace agg
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{
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//---------------------------------------------------------------------
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void line_profile_aa::width(double w)
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{
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if(w < 0.0) w = 0.0;
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if(w < m_smoother_width) w += w;
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else w += m_smoother_width;
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w *= 0.5;
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w -= m_smoother_width;
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double s = m_smoother_width;
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if(w < 0.0)
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{
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s += w;
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w = 0.0;
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}
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set(w, s);
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}
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//---------------------------------------------------------------------
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line_profile_aa::value_type* line_profile_aa::profile(double w)
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{
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m_subpixel_width = uround(w * subpixel_scale);
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unsigned size = m_subpixel_width + subpixel_scale * 6;
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if(size > m_profile.size())
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{
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m_profile.resize(size);
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}
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return &m_profile[0];
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}
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//---------------------------------------------------------------------
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void line_profile_aa::set(double center_width, double smoother_width)
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{
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double base_val = 1.0;
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if(center_width == 0.0) center_width = 1.0 / subpixel_scale;
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if(smoother_width == 0.0) smoother_width = 1.0 / subpixel_scale;
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double width = center_width + smoother_width;
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if(width < m_min_width)
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{
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double k = width / m_min_width;
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base_val *= k;
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center_width /= k;
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smoother_width /= k;
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}
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value_type* ch = profile(center_width + smoother_width);
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unsigned subpixel_center_width = unsigned(center_width * subpixel_scale);
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unsigned subpixel_smoother_width = unsigned(smoother_width * subpixel_scale);
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value_type* ch_center = ch + subpixel_scale*2;
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value_type* ch_smoother = ch_center + subpixel_center_width;
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unsigned i;
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unsigned val = m_gamma[unsigned(base_val * aa_mask)];
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ch = ch_center;
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for(i = 0; i < subpixel_center_width; i++)
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{
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*ch++ = (value_type)val;
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}
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for(i = 0; i < subpixel_smoother_width; i++)
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{
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*ch_smoother++ =
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m_gamma[unsigned((base_val -
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base_val *
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(double(i) / subpixel_smoother_width)) * aa_mask)];
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}
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unsigned n_smoother = profile_size() -
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subpixel_smoother_width -
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subpixel_center_width -
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subpixel_scale*2;
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val = m_gamma[0];
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for(i = 0; i < n_smoother; i++)
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{
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*ch_smoother++ = (value_type)val;
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}
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ch = ch_center;
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for(i = 0; i < subpixel_scale*2; i++)
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{
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*--ch = *ch_center++;
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}
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}
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}
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