156 lines
4.8 KiB
C++
156 lines
4.8 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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#ifndef AGG_GLYPH_RASTER_BIN_INCLUDED
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#define AGG_GLYPH_RASTER_BIN_INCLUDED
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#include <cstring>
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#include "agg_basics.h"
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namespace agg
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{
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//========================================================glyph_raster_bin
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template<class ColorT> class glyph_raster_bin
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{
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public:
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typedef ColorT color_type;
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//--------------------------------------------------------------------
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struct glyph_rect
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{
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int x1,y1,x2,y2;
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double dx, dy;
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};
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//--------------------------------------------------------------------
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glyph_raster_bin(const int8u* font) :
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m_font(font),
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m_big_endian(false)
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{
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int t = 1;
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if(*(char*)&t == 0) m_big_endian = true;
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std::memset(m_span, 0, sizeof(m_span));
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}
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//--------------------------------------------------------------------
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const int8u* font() const { return m_font; }
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void font(const int8u* f) { m_font = f; }
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//--------------------------------------------------------------------
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double height() const { return m_font[0]; }
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double base_line() const { return m_font[1]; }
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//--------------------------------------------------------------------
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template<class CharT>
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double width(const CharT* str) const
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{
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unsigned start_char = m_font[2];
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unsigned num_chars = m_font[3];
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unsigned w = 0;
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while(*str)
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{
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unsigned glyph = *str;
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const int8u* bits = m_font + 4 + num_chars * 2 +
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value(m_font + 4 + (glyph - start_char) * 2);
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w += *bits;
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++str;
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}
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return w;
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}
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//--------------------------------------------------------------------
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void prepare(glyph_rect* r, double x, double y, unsigned glyph, bool flip)
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{
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unsigned start_char = m_font[2];
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unsigned num_chars = m_font[3];
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m_bits = m_font + 4 + num_chars * 2 +
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value(m_font + 4 + (glyph - start_char) * 2);
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m_glyph_width = *m_bits++;
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m_glyph_byte_width = (m_glyph_width + 7) >> 3;
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r->x1 = int(x);
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r->x2 = r->x1 + m_glyph_width - 1;
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if(flip)
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{
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r->y1 = int(y) - m_font[0] + m_font[1];
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r->y2 = r->y1 + m_font[0] - 1;
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}
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else
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{
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r->y1 = int(y) - m_font[1] + 1;
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r->y2 = r->y1 + m_font[0] - 1;
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}
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r->dx = m_glyph_width;
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r->dy = 0;
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}
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//--------------------------------------------------------------------
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const cover_type* span(unsigned i)
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{
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i = m_font[0] - i - 1;
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const int8u* bits = m_bits + i * m_glyph_byte_width;
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unsigned j;
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unsigned val = *bits;
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unsigned nb = 0;
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for(j = 0; j < m_glyph_width; ++j)
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{
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m_span[j] = (cover_type)((val & 0x80) ? cover_full : cover_none);
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val <<= 1;
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if(++nb >= 8)
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{
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val = *++bits;
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nb = 0;
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}
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}
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return m_span;
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}
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private:
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//--------------------------------------------------------------------
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int16u value(const int8u* p) const
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{
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int16u v;
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if(m_big_endian)
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{
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*(int8u*)&v = p[1];
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*((int8u*)&v + 1) = p[0];
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}
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else
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{
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*(int8u*)&v = p[0];
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*((int8u*)&v + 1) = p[1];
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}
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return v;
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}
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//--------------------------------------------------------------------
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const int8u* m_font;
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bool m_big_endian;
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cover_type m_span[32];
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const int8u* m_bits;
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unsigned m_glyph_width;
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unsigned m_glyph_byte_width;
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};
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}
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#endif
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