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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#ifndef AGG_FONT_CACHE_MANAGER2_INCLUDED
#define AGG_FONT_CACHE_MANAGER2_INCLUDED
#include <cassert>
#include <exception>
#include <string.h>
#include "agg_array.h"
namespace agg {
namespace fman {
//---------------------------------------------------------glyph_data_type
enum glyph_data_type
{
glyph_data_invalid = 0,
glyph_data_mono = 1,
glyph_data_gray8 = 2,
glyph_data_outline = 3
};
//-------------------------------------------------------------cached_glyph
struct cached_glyph
{
void * cached_font;
unsigned glyph_code;
unsigned glyph_index;
int8u* data;
unsigned data_size;
glyph_data_type data_type;
rect_i bounds;
double advance_x;
double advance_y;
};
//--------------------------------------------------------------cached_glyphs
class cached_glyphs
{
public:
enum block_size_e { block_size = 16384-16 };
//--------------------------------------------------------------------
cached_glyphs()
: m_allocator(block_size)
{ memset(m_glyphs, 0, sizeof(m_glyphs)); }
//--------------------------------------------------------------------
const cached_glyph* find_glyph(unsigned glyph_code) const
{
unsigned msb = (glyph_code >> 8) & 0xFF;
if(m_glyphs[msb])
{
return m_glyphs[msb][glyph_code & 0xFF];
}
return 0;
}
//--------------------------------------------------------------------
cached_glyph* cache_glyph(
void * cached_font,
unsigned glyph_code,
unsigned glyph_index,
unsigned data_size,
glyph_data_type data_type,
const rect_i& bounds,
double advance_x,
double advance_y)
{
unsigned msb = (glyph_code >> 8) & 0xFF;
if(m_glyphs[msb] == 0)
{
m_glyphs[msb] =
(cached_glyph**)m_allocator.allocate(sizeof(cached_glyph*) * 256,
sizeof(cached_glyph*));
memset(m_glyphs[msb], 0, sizeof(cached_glyph*) * 256);
}
unsigned lsb = glyph_code & 0xFF;
if(m_glyphs[msb][lsb]) return 0; // Already exists, do not overwrite
cached_glyph* glyph =
(cached_glyph*)m_allocator.allocate(sizeof(cached_glyph),
sizeof(double));
glyph->cached_font = cached_font;
glyph->glyph_code = glyph_code;
glyph->glyph_index = glyph_index;
glyph->data = m_allocator.allocate(data_size);
glyph->data_size = data_size;
glyph->data_type = data_type;
glyph->bounds = bounds;
glyph->advance_x = advance_x;
glyph->advance_y = advance_y;
return m_glyphs[msb][lsb] = glyph;
}
private:
block_allocator m_allocator;
cached_glyph** m_glyphs[256];
};
//------------------------------------------------------------------------
enum glyph_rendering
{
glyph_ren_native_mono,
glyph_ren_native_gray8,
glyph_ren_outline,
glyph_ren_agg_mono,
glyph_ren_agg_gray8
};
//------------------------------------------------------font_cache_manager
template<class FontEngine> class font_cache_manager
{
public:
typedef FontEngine font_engine_type;
typedef font_cache_manager<FontEngine> self_type;
typedef typename font_engine_type::path_adaptor_type path_adaptor_type;
typedef typename font_engine_type::gray8_adaptor_type gray8_adaptor_type;
typedef typename gray8_adaptor_type::embedded_scanline gray8_scanline_type;
typedef typename font_engine_type::mono_adaptor_type mono_adaptor_type;
typedef typename mono_adaptor_type::embedded_scanline mono_scanline_type;
struct cached_font
{
cached_font(
font_engine_type& engine,
typename FontEngine::loaded_face *face,
double height,
double width,
bool hinting,
glyph_rendering rendering )
: m_engine( engine )
, m_face( face )
, m_height( height )
, m_width( width )
, m_hinting( hinting )
, m_rendering( rendering )
{
select_face();
m_face_height=m_face->height();
m_face_width=m_face->width();
m_face_ascent=m_face->ascent();
m_face_descent=m_face->descent();
m_face_ascent_b=m_face->ascent_b();
m_face_descent_b=m_face->descent_b();
}
double height() const
{
return m_face_height;
}
double width() const
{
return m_face_width;
}
double ascent() const
{
return m_face_ascent;
}
double descent() const
{
return m_face_descent;
}
double ascent_b() const
{
return m_face_ascent_b;
}
double descent_b() const
{
return m_face_descent_b;
}
bool add_kerning( const cached_glyph *first, const cached_glyph *second, double* x, double* y)
{
if( !first || !second )
return false;
select_face();
return m_face->add_kerning(
first->glyph_index, second->glyph_index, x, y );
}
void select_face()
{
m_face->select_instance( m_height, m_width, m_hinting, m_rendering );
}
const cached_glyph *get_glyph(unsigned cp)
{
const cached_glyph *glyph=m_glyphs.find_glyph(cp);
if( glyph==0 )
{
typename FontEngine::prepared_glyph prepared;
select_face();
bool success=m_face->prepare_glyph(cp, &prepared);
if( success )
{
glyph=m_glyphs.cache_glyph(
this,
prepared.glyph_code,
prepared.glyph_index,
prepared.data_size,
prepared.data_type,
prepared.bounds,
prepared.advance_x,
prepared.advance_y );
assert( glyph!=0 );
m_face->write_glyph_to(&prepared,glyph->data);
}
}
return glyph;
}
font_engine_type& m_engine;
typename FontEngine::loaded_face *m_face;
double m_height;
double m_width;
bool m_hinting;
glyph_rendering m_rendering;
double m_face_height;
double m_face_width;
double m_face_ascent;
double m_face_descent;
double m_face_ascent_b;
double m_face_descent_b;
cached_glyphs m_glyphs;
};
//--------------------------------------------------------------------
font_cache_manager(font_engine_type& engine, unsigned max_fonts=32)
:m_engine(engine)
{ }
//--------------------------------------------------------------------
void init_embedded_adaptors(const cached_glyph* gl,
double x, double y,
double scale=1.0)
{
if(gl)
{
switch(gl->data_type)
{
default: return;
case glyph_data_mono:
m_mono_adaptor.init(gl->data, gl->data_size, x, y);
break;
case glyph_data_gray8:
m_gray8_adaptor.init(gl->data, gl->data_size, x, y);
break;
case glyph_data_outline:
m_path_adaptor.init(gl->data, gl->data_size, x, y, scale);
break;
}
}
}
//--------------------------------------------------------------------
path_adaptor_type& path_adaptor() { return m_path_adaptor; }
gray8_adaptor_type& gray8_adaptor() { return m_gray8_adaptor; }
gray8_scanline_type& gray8_scanline() { return m_gray8_scanline; }
mono_adaptor_type& mono_adaptor() { return m_mono_adaptor; }
mono_scanline_type& mono_scanline() { return m_mono_scanline; }
private:
//--------------------------------------------------------------------
font_cache_manager(const self_type&);
const self_type& operator = (const self_type&);
font_engine_type& m_engine;
path_adaptor_type m_path_adaptor;
gray8_adaptor_type m_gray8_adaptor;
gray8_scanline_type m_gray8_scanline;
mono_adaptor_type m_mono_adaptor;
mono_scanline_type m_mono_scanline;
};
}
}
#endif
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