551 lines
18 KiB
C
551 lines
18 KiB
C
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//----------------------------------------------------------------------------
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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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//
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// class renderer_base
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_RENDERER_BASE_INCLUDED
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#define AGG_RENDERER_BASE_INCLUDED
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#include "agg_basics.h"
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#include "agg_rendering_buffer.h"
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namespace agg
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{
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//-----------------------------------------------------------renderer_base
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template<class PixelFormat> class renderer_base
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{
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public:
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typedef PixelFormat pixfmt_type;
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typedef typename pixfmt_type::color_type color_type;
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typedef typename pixfmt_type::row_data row_data;
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//--------------------------------------------------------------------
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renderer_base() : m_ren(0), m_clip_box(1, 1, 0, 0) {}
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renderer_base(pixfmt_type& ren) :
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m_ren(&ren),
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m_clip_box(0, 0, ren.width() - 1, ren.height() - 1)
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{}
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void attach(pixfmt_type& ren)
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{
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m_ren = &ren;
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m_clip_box = rect_i(0, 0, ren.width() - 1, ren.height() - 1);
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}
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//--------------------------------------------------------------------
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const pixfmt_type& ren() const { return *m_ren; }
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pixfmt_type& ren() { return *m_ren; }
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//--------------------------------------------------------------------
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unsigned width() const { return m_ren->width(); }
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unsigned height() const { return m_ren->height(); }
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//--------------------------------------------------------------------
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bool clip_box(int x1, int y1, int x2, int y2)
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{
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rect_i cb(x1, y1, x2, y2);
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cb.normalize();
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if(cb.clip(rect_i(0, 0, width() - 1, height() - 1)))
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{
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m_clip_box = cb;
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return true;
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}
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m_clip_box.x1 = 1;
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m_clip_box.y1 = 1;
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m_clip_box.x2 = 0;
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m_clip_box.y2 = 0;
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return false;
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}
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//--------------------------------------------------------------------
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void reset_clipping(bool visibility)
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{
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if(visibility)
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{
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m_clip_box.x1 = 0;
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m_clip_box.y1 = 0;
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m_clip_box.x2 = width() - 1;
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m_clip_box.y2 = height() - 1;
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}
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else
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{
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m_clip_box.x1 = 1;
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m_clip_box.y1 = 1;
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m_clip_box.x2 = 0;
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m_clip_box.y2 = 0;
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}
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}
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//--------------------------------------------------------------------
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void clip_box_naked(int x1, int y1, int x2, int y2)
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{
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m_clip_box.x1 = x1;
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m_clip_box.y1 = y1;
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m_clip_box.x2 = x2;
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m_clip_box.y2 = y2;
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}
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//--------------------------------------------------------------------
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bool inbox(int x, int y) const
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{
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return x >= m_clip_box.x1 && y >= m_clip_box.y1 &&
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x <= m_clip_box.x2 && y <= m_clip_box.y2;
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}
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//--------------------------------------------------------------------
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const rect_i& clip_box() const { return m_clip_box; }
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int xmin() const { return m_clip_box.x1; }
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int ymin() const { return m_clip_box.y1; }
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int xmax() const { return m_clip_box.x2; }
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int ymax() const { return m_clip_box.y2; }
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//--------------------------------------------------------------------
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const rect_i& bounding_clip_box() const { return m_clip_box; }
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int bounding_xmin() const { return m_clip_box.x1; }
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int bounding_ymin() const { return m_clip_box.y1; }
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int bounding_xmax() const { return m_clip_box.x2; }
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int bounding_ymax() const { return m_clip_box.y2; }
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//--------------------------------------------------------------------
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void clear(const color_type& c)
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{
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unsigned y;
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if(width())
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{
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for(y = 0; y < height(); y++)
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{
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m_ren->copy_hline(0, y, width(), c);
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}
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}
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}
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//--------------------------------------------------------------------
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void copy_pixel(int x, int y, const color_type& c)
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{
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if(inbox(x, y))
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{
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m_ren->copy_pixel(x, y, c);
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}
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}
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//--------------------------------------------------------------------
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void blend_pixel(int x, int y, const color_type& c, cover_type cover)
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{
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if(inbox(x, y))
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{
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m_ren->blend_pixel(x, y, c, cover);
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}
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}
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//--------------------------------------------------------------------
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color_type pixel(int x, int y) const
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{
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return inbox(x, y) ?
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m_ren->pixel(x, y) :
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color_type::no_color();
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}
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//--------------------------------------------------------------------
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void copy_hline(int x1, int y, int x2, const color_type& c)
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{
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if(x1 > x2) { int t = x2; x2 = x1; x1 = t; }
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if(y > ymax()) return;
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if(y < ymin()) return;
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if(x1 > xmax()) return;
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if(x2 < xmin()) return;
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if(x1 < xmin()) x1 = xmin();
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if(x2 > xmax()) x2 = xmax();
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m_ren->copy_hline(x1, y, x2 - x1 + 1, c);
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}
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//--------------------------------------------------------------------
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void copy_vline(int x, int y1, int y2, const color_type& c)
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{
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if(y1 > y2) { int t = y2; y2 = y1; y1 = t; }
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if(x > xmax()) return;
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if(x < xmin()) return;
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if(y1 > ymax()) return;
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if(y2 < ymin()) return;
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if(y1 < ymin()) y1 = ymin();
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if(y2 > ymax()) y2 = ymax();
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m_ren->copy_vline(x, y1, y2 - y1 + 1, c);
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}
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//--------------------------------------------------------------------
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void blend_hline(int x1, int y, int x2,
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const color_type& c, cover_type cover)
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{
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if(x1 > x2) { int t = x2; x2 = x1; x1 = t; }
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if(y > ymax()) return;
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if(y < ymin()) return;
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if(x1 > xmax()) return;
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if(x2 < xmin()) return;
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if(x1 < xmin()) x1 = xmin();
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if(x2 > xmax()) x2 = xmax();
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m_ren->blend_hline(x1, y, x2 - x1 + 1, c, cover);
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}
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//--------------------------------------------------------------------
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void blend_vline(int x, int y1, int y2,
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const color_type& c, cover_type cover)
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{
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if(y1 > y2) { int t = y2; y2 = y1; y1 = t; }
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if(x > xmax()) return;
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if(x < xmin()) return;
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if(y1 > ymax()) return;
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if(y2 < ymin()) return;
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if(y1 < ymin()) y1 = ymin();
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if(y2 > ymax()) y2 = ymax();
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m_ren->blend_vline(x, y1, y2 - y1 + 1, c, cover);
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}
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//--------------------------------------------------------------------
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void copy_bar(int x1, int y1, int x2, int y2, const color_type& c)
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{
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rect_i rc(x1, y1, x2, y2);
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rc.normalize();
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if(rc.clip(clip_box()))
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{
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int y;
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for(y = rc.y1; y <= rc.y2; y++)
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{
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m_ren->copy_hline(rc.x1, y, unsigned(rc.x2 - rc.x1 + 1), c);
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}
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}
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}
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//--------------------------------------------------------------------
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void blend_bar(int x1, int y1, int x2, int y2,
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const color_type& c, cover_type cover)
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{
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rect_i rc(x1, y1, x2, y2);
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rc.normalize();
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if(rc.clip(clip_box()))
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{
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int y;
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for(y = rc.y1; y <= rc.y2; y++)
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{
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m_ren->blend_hline(rc.x1,
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y,
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unsigned(rc.x2 - rc.x1 + 1),
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c,
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cover);
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}
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}
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}
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//--------------------------------------------------------------------
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void blend_solid_hspan(int x, int y, int len,
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const color_type& c,
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const cover_type* covers)
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{
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if(y > ymax()) return;
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if(y < ymin()) return;
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if(x < xmin())
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{
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len -= xmin() - x;
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if(len <= 0) return;
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covers += xmin() - x;
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x = xmin();
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}
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if(x + len > xmax())
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{
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len = xmax() - x + 1;
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if(len <= 0) return;
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}
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m_ren->blend_solid_hspan(x, y, len, c, covers);
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}
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//--------------------------------------------------------------------
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void blend_solid_vspan(int x, int y, int len,
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const color_type& c,
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const cover_type* covers)
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{
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if(x > xmax()) return;
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if(x < xmin()) return;
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if(y < ymin())
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{
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len -= ymin() - y;
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if(len <= 0) return;
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covers += ymin() - y;
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y = ymin();
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}
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if(y + len > ymax())
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{
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len = ymax() - y + 1;
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if(len <= 0) return;
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}
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m_ren->blend_solid_vspan(x, y, len, c, covers);
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}
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//--------------------------------------------------------------------
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void copy_color_hspan(int x, int y, int len, const color_type* colors)
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{
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if(y > ymax()) return;
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if(y < ymin()) return;
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if(x < xmin())
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{
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int d = xmin() - x;
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len -= d;
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if(len <= 0) return;
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colors += d;
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x = xmin();
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}
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if(x + len > xmax())
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{
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len = xmax() - x + 1;
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if(len <= 0) return;
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}
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m_ren->copy_color_hspan(x, y, len, colors);
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}
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//--------------------------------------------------------------------
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void blend_color_hspan(int x, int y, int len,
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const color_type* colors,
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const cover_type* covers,
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cover_type cover = agg::cover_full)
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{
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if(y > ymax()) return;
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if(y < ymin()) return;
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if(x < xmin())
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{
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int d = xmin() - x;
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len -= d;
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if(len <= 0) return;
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if(covers) covers += d;
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colors += d;
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x = xmin();
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}
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if(x + len > xmax())
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{
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len = xmax() - x + 1;
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if(len <= 0) return;
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}
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m_ren->blend_color_hspan(x, y, len, colors, covers, cover);
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}
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//--------------------------------------------------------------------
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void blend_color_vspan(int x, int y, int len,
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const color_type* colors,
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const cover_type* covers,
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cover_type cover = agg::cover_full)
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{
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if(x > xmax()) return;
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if(x < xmin()) return;
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if(y < ymin())
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{
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int d = ymin() - y;
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len -= d;
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if(len <= 0) return;
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if(covers) covers += d;
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colors += d;
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y = ymin();
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}
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if(y + len > ymax())
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{
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len = ymax() - y + 1;
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if(len <= 0) return;
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}
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m_ren->blend_color_vspan(x, y, len, colors, covers, cover);
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}
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//--------------------------------------------------------------------
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rect_i clip_rect_area(rect_i& dst, rect_i& src, int wsrc, int hsrc) const
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{
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rect_i rc(0,0,0,0);
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rect_i cb = clip_box();
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++cb.x2;
|
||
|
|
++cb.y2;
|
||
|
|
|
||
|
|
if(src.x1 < 0)
|
||
|
|
{
|
||
|
|
dst.x1 -= src.x1;
|
||
|
|
src.x1 = 0;
|
||
|
|
}
|
||
|
|
if(src.y1 < 0)
|
||
|
|
{
|
||
|
|
dst.y1 -= src.y1;
|
||
|
|
src.y1 = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(src.x2 > wsrc) src.x2 = wsrc;
|
||
|
|
if(src.y2 > hsrc) src.y2 = hsrc;
|
||
|
|
|
||
|
|
if(dst.x1 < cb.x1)
|
||
|
|
{
|
||
|
|
src.x1 += cb.x1 - dst.x1;
|
||
|
|
dst.x1 = cb.x1;
|
||
|
|
}
|
||
|
|
if(dst.y1 < cb.y1)
|
||
|
|
{
|
||
|
|
src.y1 += cb.y1 - dst.y1;
|
||
|
|
dst.y1 = cb.y1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(dst.x2 > cb.x2) dst.x2 = cb.x2;
|
||
|
|
if(dst.y2 > cb.y2) dst.y2 = cb.y2;
|
||
|
|
|
||
|
|
rc.x2 = dst.x2 - dst.x1;
|
||
|
|
rc.y2 = dst.y2 - dst.y1;
|
||
|
|
|
||
|
|
if(rc.x2 > src.x2 - src.x1) rc.x2 = src.x2 - src.x1;
|
||
|
|
if(rc.y2 > src.y2 - src.y1) rc.y2 = src.y2 - src.y1;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
template<class RenBuf>
|
||
|
|
void copy_from(const RenBuf& src,
|
||
|
|
const rect_i* rect_src_ptr = 0,
|
||
|
|
int dx = 0,
|
||
|
|
int dy = 0)
|
||
|
|
{
|
||
|
|
rect_i rsrc(0, 0, src.width(), src.height());
|
||
|
|
if(rect_src_ptr)
|
||
|
|
{
|
||
|
|
rsrc.x1 = rect_src_ptr->x1;
|
||
|
|
rsrc.y1 = rect_src_ptr->y1;
|
||
|
|
rsrc.x2 = rect_src_ptr->x2 + 1;
|
||
|
|
rsrc.y2 = rect_src_ptr->y2 + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Version with xdst, ydst (absolute positioning)
|
||
|
|
//rect_i rdst(xdst, ydst, xdst + rsrc.x2 - rsrc.x1, ydst + rsrc.y2 - rsrc.y1);
|
||
|
|
|
||
|
|
// Version with dx, dy (relative positioning)
|
||
|
|
rect_i rdst(rsrc.x1 + dx, rsrc.y1 + dy, rsrc.x2 + dx, rsrc.y2 + dy);
|
||
|
|
|
||
|
|
rect_i rc = clip_rect_area(rdst, rsrc, src.width(), src.height());
|
||
|
|
|
||
|
|
if(rc.x2 > 0)
|
||
|
|
{
|
||
|
|
int incy = 1;
|
||
|
|
if(rdst.y1 > rsrc.y1)
|
||
|
|
{
|
||
|
|
rsrc.y1 += rc.y2 - 1;
|
||
|
|
rdst.y1 += rc.y2 - 1;
|
||
|
|
incy = -1;
|
||
|
|
}
|
||
|
|
while(rc.y2 > 0)
|
||
|
|
{
|
||
|
|
m_ren->copy_from(src,
|
||
|
|
rdst.x1, rdst.y1,
|
||
|
|
rsrc.x1, rsrc.y1,
|
||
|
|
rc.x2);
|
||
|
|
rdst.y1 += incy;
|
||
|
|
rsrc.y1 += incy;
|
||
|
|
--rc.y2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
template<class SrcPixelFormatRenderer>
|
||
|
|
void blend_from(const SrcPixelFormatRenderer& src,
|
||
|
|
const rect_i* rect_src_ptr = 0,
|
||
|
|
int dx = 0,
|
||
|
|
int dy = 0,
|
||
|
|
cover_type cover = agg::cover_full)
|
||
|
|
{
|
||
|
|
rect_i rsrc(0, 0, src.width(), src.height());
|
||
|
|
if(rect_src_ptr)
|
||
|
|
{
|
||
|
|
rsrc.x1 = rect_src_ptr->x1;
|
||
|
|
rsrc.y1 = rect_src_ptr->y1;
|
||
|
|
rsrc.x2 = rect_src_ptr->x2 + 1;
|
||
|
|
rsrc.y2 = rect_src_ptr->y2 + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Version with xdst, ydst (absolute positioning)
|
||
|
|
//rect_i rdst(xdst, ydst, xdst + rsrc.x2 - rsrc.x1, ydst + rsrc.y2 - rsrc.y1);
|
||
|
|
|
||
|
|
// Version with dx, dy (relative positioning)
|
||
|
|
rect_i rdst(rsrc.x1 + dx, rsrc.y1 + dy, rsrc.x2 + dx, rsrc.y2 + dy);
|
||
|
|
rect_i rc = clip_rect_area(rdst, rsrc, src.width(), src.height());
|
||
|
|
|
||
|
|
if(rc.x2 > 0)
|
||
|
|
{
|
||
|
|
int incy = 1;
|
||
|
|
if(rdst.y1 > rsrc.y1)
|
||
|
|
{
|
||
|
|
rsrc.y1 += rc.y2 - 1;
|
||
|
|
rdst.y1 += rc.y2 - 1;
|
||
|
|
incy = -1;
|
||
|
|
}
|
||
|
|
while(rc.y2 > 0)
|
||
|
|
{
|
||
|
|
typename SrcPixelFormatRenderer::row_data rw = src.row(rsrc.y1);
|
||
|
|
if(rw.ptr)
|
||
|
|
{
|
||
|
|
int x1src = rsrc.x1;
|
||
|
|
int x1dst = rdst.x1;
|
||
|
|
int len = rc.x2;
|
||
|
|
if(rw.x1 > x1src)
|
||
|
|
{
|
||
|
|
x1dst += rw.x1 - x1src;
|
||
|
|
len -= rw.x1 - x1src;
|
||
|
|
x1src = rw.x1;
|
||
|
|
}
|
||
|
|
if(len > 0)
|
||
|
|
{
|
||
|
|
if(x1src + len-1 > rw.x2)
|
||
|
|
{
|
||
|
|
len -= x1src + len - rw.x2 - 1;
|
||
|
|
}
|
||
|
|
if(len > 0)
|
||
|
|
{
|
||
|
|
m_ren->blend_from(src,
|
||
|
|
x1dst, rdst.y1,
|
||
|
|
x1src, rsrc.y1,
|
||
|
|
len,
|
||
|
|
cover);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
rdst.y1 += incy;
|
||
|
|
rsrc.y1 += incy;
|
||
|
|
--rc.y2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
pixfmt_type* m_ren;
|
||
|
|
rect_i m_clip_box;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|