586 lines
18 KiB
C++
586 lines
18 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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//
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// Adaptation for 32-bit screen coordinates has been sponsored by
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// Liberty Technology Systems, Inc., visit http://lib-sys.com
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//
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// Liberty Technology Systems, Inc. is the provider of
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// PostScript and PDF technology for software developers.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_SCANLINE_STORAGE_BIN_INCLUDED
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#define AGG_SCANLINE_STORAGE_BIN_INCLUDED
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#include <cstdlib>
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#include <limits>
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#include "agg_array.h"
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namespace agg
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{
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//-----------------------------------------------scanline_storage_bin
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class scanline_storage_bin
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{
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public:
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//---------------------------------------------------------------
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struct span_data
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{
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int32 x;
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int32 len;
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};
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//---------------------------------------------------------------
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struct scanline_data
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{
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int y;
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unsigned num_spans;
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unsigned start_span;
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};
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//---------------------------------------------------------------
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class embedded_scanline
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{
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public:
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//-----------------------------------------------------------
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class const_iterator
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{
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public:
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const_iterator() : m_storage(0) {}
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const_iterator(const embedded_scanline* sl) :
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m_storage(sl->m_storage),
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m_span_idx(sl->m_scanline.start_span)
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{
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m_span = m_storage->span_by_index(m_span_idx);
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}
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const span_data& operator*() const { return m_span; }
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const span_data* operator->() const { return &m_span; }
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void operator ++ ()
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{
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++m_span_idx;
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m_span = m_storage->span_by_index(m_span_idx);
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}
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private:
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const scanline_storage_bin* m_storage;
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unsigned m_span_idx;
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span_data m_span;
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};
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friend class const_iterator;
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//-----------------------------------------------------------
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embedded_scanline(scanline_storage_bin& storage) :
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m_storage(&storage)
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{
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setup(0);
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}
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//-----------------------------------------------------------
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void reset(int, int) {}
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unsigned num_spans() const { return m_scanline.num_spans; }
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int y() const { return m_scanline.y; }
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const_iterator begin() const { return const_iterator(this); }
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//-----------------------------------------------------------
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void setup(unsigned scanline_idx)
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{
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m_scanline_idx = scanline_idx;
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m_scanline = m_storage->scanline_by_index(m_scanline_idx);
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}
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private:
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scanline_storage_bin* m_storage;
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scanline_data m_scanline;
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unsigned m_scanline_idx;
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};
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//---------------------------------------------------------------
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scanline_storage_bin() :
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m_spans(256-2), // Block increment size
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m_scanlines(),
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m_min_x(std::numeric_limits<int>::max()),
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m_min_y(std::numeric_limits<int>::max()),
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m_max_x(std::numeric_limits<int>::min()),
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m_max_y(std::numeric_limits<int>::min()),
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m_cur_scanline(0)
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{
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m_fake_scanline.y = 0;
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m_fake_scanline.num_spans = 0;
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m_fake_scanline.start_span = 0;
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m_fake_span.x = 0;
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m_fake_span.len = 0;
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}
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// Renderer Interface
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//---------------------------------------------------------------
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void prepare()
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{
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m_scanlines.remove_all();
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m_spans.remove_all();
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m_min_x = std::numeric_limits<int>::max();
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m_min_y = std::numeric_limits<int>::max();
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m_max_x = std::numeric_limits<int>::min();
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m_max_y = std::numeric_limits<int>::min();
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m_cur_scanline = 0;
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}
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//---------------------------------------------------------------
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template<class Scanline> void render(const Scanline& sl)
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{
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scanline_data sl_this;
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int y = sl.y();
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if(y < m_min_y) m_min_y = y;
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if(y > m_max_y) m_max_y = y;
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sl_this.y = y;
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sl_this.num_spans = sl.num_spans();
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sl_this.start_span = m_spans.size();
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typename Scanline::const_iterator span_iterator = sl.begin();
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unsigned num_spans = sl_this.num_spans;
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for(;;)
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{
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span_data sp;
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sp.x = span_iterator->x;
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sp.len = (int32)std::abs((int)(span_iterator->len));
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m_spans.add(sp);
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int x1 = sp.x;
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int x2 = sp.x + sp.len - 1;
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if(x1 < m_min_x) m_min_x = x1;
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if(x2 > m_max_x) m_max_x = x2;
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if(--num_spans == 0) break;
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++span_iterator;
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}
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m_scanlines.add(sl_this);
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}
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//---------------------------------------------------------------
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// Iterate scanlines interface
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int min_x() const { return m_min_x; }
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int min_y() const { return m_min_y; }
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int max_x() const { return m_max_x; }
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int max_y() const { return m_max_y; }
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//---------------------------------------------------------------
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bool rewind_scanlines()
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{
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m_cur_scanline = 0;
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return m_scanlines.size() > 0;
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}
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//---------------------------------------------------------------
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template<class Scanline> bool sweep_scanline(Scanline& sl)
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{
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sl.reset_spans();
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for(;;)
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{
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if(m_cur_scanline >= m_scanlines.size()) return false;
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const scanline_data& sl_this = m_scanlines[m_cur_scanline];
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unsigned num_spans = sl_this.num_spans;
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unsigned span_idx = sl_this.start_span;
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do
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{
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const span_data& sp = m_spans[span_idx++];
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sl.add_span(sp.x, sp.len, cover_full);
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}
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while(--num_spans);
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++m_cur_scanline;
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if(sl.num_spans())
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{
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sl.finalize(sl_this.y);
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break;
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}
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}
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return true;
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}
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//---------------------------------------------------------------
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// Specialization for embedded_scanline
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bool sweep_scanline(embedded_scanline& sl)
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{
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do
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{
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if(m_cur_scanline >= m_scanlines.size()) return false;
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sl.setup(m_cur_scanline);
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++m_cur_scanline;
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}
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while(sl.num_spans() == 0);
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return true;
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}
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//---------------------------------------------------------------
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unsigned byte_size() const
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{
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unsigned i;
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unsigned size = sizeof(int32) * 4; // min_x, min_y, max_x, max_y
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for(i = 0; i < m_scanlines.size(); ++i)
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{
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size += sizeof(int32) * 2 + // Y, num_spans
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unsigned(m_scanlines[i].num_spans) * sizeof(int32) * 2; // X, span_len
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}
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return size;
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}
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//---------------------------------------------------------------
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static void write_int32(int8u* dst, int32 val)
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{
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dst[0] = ((const int8u*)&val)[0];
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dst[1] = ((const int8u*)&val)[1];
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dst[2] = ((const int8u*)&val)[2];
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dst[3] = ((const int8u*)&val)[3];
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}
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//---------------------------------------------------------------
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void serialize(int8u* data) const
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{
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unsigned i;
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write_int32(data, min_x()); // min_x
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data += sizeof(int32);
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write_int32(data, min_y()); // min_y
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data += sizeof(int32);
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write_int32(data, max_x()); // max_x
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data += sizeof(int32);
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write_int32(data, max_y()); // max_y
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data += sizeof(int32);
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for(i = 0; i < m_scanlines.size(); ++i)
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{
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const scanline_data& sl_this = m_scanlines[i];
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write_int32(data, sl_this.y); // Y
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data += sizeof(int32);
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write_int32(data, sl_this.num_spans); // num_spans
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data += sizeof(int32);
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unsigned num_spans = sl_this.num_spans;
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unsigned span_idx = sl_this.start_span;
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do
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{
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const span_data& sp = m_spans[span_idx++];
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write_int32(data, sp.x); // X
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data += sizeof(int32);
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write_int32(data, sp.len); // len
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data += sizeof(int32);
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}
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while(--num_spans);
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}
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}
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//---------------------------------------------------------------
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const scanline_data& scanline_by_index(unsigned i) const
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{
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return (i < m_scanlines.size()) ? m_scanlines[i] : m_fake_scanline;
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}
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//---------------------------------------------------------------
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const span_data& span_by_index(unsigned i) const
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{
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return (i < m_spans.size()) ? m_spans[i] : m_fake_span;
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}
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private:
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pod_bvector<span_data, 10> m_spans;
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pod_bvector<scanline_data, 8> m_scanlines;
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span_data m_fake_span;
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scanline_data m_fake_scanline;
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int m_min_x;
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int m_min_y;
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int m_max_x;
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int m_max_y;
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unsigned m_cur_scanline;
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};
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//---------------------------------------serialized_scanlines_adaptor_bin
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class serialized_scanlines_adaptor_bin
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{
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public:
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typedef bool cover_type;
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//--------------------------------------------------------------------
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class embedded_scanline
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{
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public:
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//----------------------------------------------------------------
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class const_iterator
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{
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public:
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struct span
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{
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int32 x;
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int32 len;
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};
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const_iterator() : m_ptr(0) {}
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const_iterator(const embedded_scanline* sl) :
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m_ptr(sl->m_ptr),
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m_dx(sl->m_dx)
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{
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m_span.x = read_int32() + m_dx;
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m_span.len = read_int32();
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}
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const span& operator*() const { return m_span; }
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const span* operator->() const { return &m_span; }
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void operator ++ ()
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{
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m_span.x = read_int32() + m_dx;
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m_span.len = read_int32();
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}
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private:
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int read_int32()
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{
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int32 val;
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((int8u*)&val)[0] = *m_ptr++;
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((int8u*)&val)[1] = *m_ptr++;
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((int8u*)&val)[2] = *m_ptr++;
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((int8u*)&val)[3] = *m_ptr++;
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return val;
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}
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const int8u* m_ptr;
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span m_span;
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int m_dx;
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};
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friend class const_iterator;
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//----------------------------------------------------------------
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embedded_scanline() : m_ptr(0), m_y(0), m_num_spans(0) {}
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//----------------------------------------------------------------
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void reset(int, int) {}
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unsigned num_spans() const { return m_num_spans; }
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int y() const { return m_y; }
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const_iterator begin() const { return const_iterator(this); }
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private:
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//----------------------------------------------------------------
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int read_int32()
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{
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int32 val;
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((int8u*)&val)[0] = *m_ptr++;
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((int8u*)&val)[1] = *m_ptr++;
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((int8u*)&val)[2] = *m_ptr++;
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((int8u*)&val)[3] = *m_ptr++;
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return val;
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}
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public:
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//----------------------------------------------------------------
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void init(const int8u* ptr, int dx, int dy)
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{
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m_ptr = ptr;
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m_y = read_int32() + dy;
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m_num_spans = unsigned(read_int32());
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m_dx = dx;
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}
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private:
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const int8u* m_ptr;
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int m_y;
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unsigned m_num_spans;
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int m_dx;
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};
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public:
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//--------------------------------------------------------------------
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serialized_scanlines_adaptor_bin() :
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m_data(0),
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m_end(0),
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m_ptr(0),
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m_dx(0),
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m_dy(0),
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m_min_x(std::numeric_limits<int>::max()),
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m_min_y(std::numeric_limits<int>::max()),
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m_max_x(std::numeric_limits<int>::min()),
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m_max_y(std::numeric_limits<int>::min())
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{}
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//--------------------------------------------------------------------
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serialized_scanlines_adaptor_bin(const int8u* data, unsigned size,
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double dx, double dy) :
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m_data(data),
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m_end(data + size),
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m_ptr(data),
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m_dx(iround(dx)),
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m_dy(iround(dy)),
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m_min_x(std::numeric_limits<int>::max()),
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m_min_y(std::numeric_limits<int>::max()),
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m_max_x(std::numeric_limits<int>::min()),
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m_max_y(std::numeric_limits<int>::min())
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{}
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//--------------------------------------------------------------------
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void init(const int8u* data, unsigned size, double dx, double dy)
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{
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m_data = data;
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m_end = data + size;
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m_ptr = data;
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m_dx = iround(dx);
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m_dy = iround(dy);
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m_min_x = std::numeric_limits<int>::max();
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m_min_y = std::numeric_limits<int>::max();
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m_max_x = std::numeric_limits<int>::min();
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m_max_y = std::numeric_limits<int>::min();
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}
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private:
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//--------------------------------------------------------------------
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int read_int32()
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{
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int32 val;
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((int8u*)&val)[0] = *m_ptr++;
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((int8u*)&val)[1] = *m_ptr++;
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((int8u*)&val)[2] = *m_ptr++;
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((int8u*)&val)[3] = *m_ptr++;
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return val;
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}
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public:
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// Iterate scanlines interface
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//--------------------------------------------------------------------
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bool rewind_scanlines()
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{
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m_ptr = m_data;
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if(m_ptr < m_end)
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{
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m_min_x = read_int32() + m_dx;
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m_min_y = read_int32() + m_dy;
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m_max_x = read_int32() + m_dx;
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m_max_y = read_int32() + m_dy;
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}
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return m_ptr < m_end;
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}
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//--------------------------------------------------------------------
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int min_x() const { return m_min_x; }
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int min_y() const { return m_min_y; }
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int max_x() const { return m_max_x; }
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int max_y() const { return m_max_y; }
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//--------------------------------------------------------------------
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template<class Scanline> bool sweep_scanline(Scanline& sl)
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{
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sl.reset_spans();
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for(;;)
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{
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if(m_ptr >= m_end) return false;
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int y = read_int32() + m_dy;
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unsigned num_spans = read_int32();
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do
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{
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int x = read_int32() + m_dx;
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int len = read_int32();
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if(len < 0) len = -len;
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sl.add_span(x, unsigned(len), cover_full);
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}
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while(--num_spans);
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if(sl.num_spans())
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{
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sl.finalize(y);
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break;
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}
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}
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return true;
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}
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//--------------------------------------------------------------------
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// Specialization for embedded_scanline
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bool sweep_scanline(embedded_scanline& sl)
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{
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do
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{
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if(m_ptr >= m_end) return false;
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sl.init(m_ptr, m_dx, m_dy);
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// Jump to the next scanline
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//--------------------------
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read_int32(); // Y
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int num_spans = read_int32(); // num_spans
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m_ptr += num_spans * sizeof(int32) * 2;
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}
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while(sl.num_spans() == 0);
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return true;
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}
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private:
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const int8u* m_data;
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const int8u* m_end;
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const int8u* m_ptr;
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int m_dx;
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int m_dy;
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int m_min_x;
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int m_min_y;
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int m_max_x;
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int m_max_y;
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};
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}
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#endif
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