116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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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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