410 lines
14 KiB
C++
410 lines
14 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_FONT_CACHE_MANAGER_INCLUDED
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#define AGG_FONT_CACHE_MANAGER_INCLUDED
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#include <cstring>
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#include "agg_array.h"
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namespace agg
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{
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//---------------------------------------------------------glyph_data_type
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enum glyph_data_type
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{
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glyph_data_invalid = 0,
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glyph_data_mono = 1,
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glyph_data_gray8 = 2,
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glyph_data_outline = 3
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};
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//-------------------------------------------------------------glyph_cache
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struct glyph_cache
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{
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unsigned glyph_index;
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int8u* data;
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unsigned data_size;
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glyph_data_type data_type;
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rect_i bounds;
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double advance_x;
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double advance_y;
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};
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//--------------------------------------------------------------font_cache
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class font_cache
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{
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public:
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enum block_size_e { block_size = 16384-16 };
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//--------------------------------------------------------------------
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font_cache() :
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m_allocator(block_size),
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m_font_signature(0)
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{}
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//--------------------------------------------------------------------
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void signature(const char* font_signature)
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{
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m_font_signature = (char*)m_allocator.allocate(std::strlen(font_signature) + 1);
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std::strcpy(m_font_signature, font_signature);
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std::memset(m_glyphs, 0, sizeof(m_glyphs));
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}
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//--------------------------------------------------------------------
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bool font_is(const char* font_signature) const
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{
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return std::strcmp(font_signature, m_font_signature) == 0;
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}
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//--------------------------------------------------------------------
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const glyph_cache* find_glyph(unsigned glyph_code) const
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{
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unsigned msb = (glyph_code >> 8) & 0xFF;
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if(m_glyphs[msb])
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{
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return m_glyphs[msb][glyph_code & 0xFF];
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}
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return 0;
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}
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//--------------------------------------------------------------------
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glyph_cache* cache_glyph(unsigned glyph_code,
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unsigned glyph_index,
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unsigned data_size,
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glyph_data_type data_type,
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const rect_i& bounds,
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double advance_x,
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double advance_y)
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{
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unsigned msb = (glyph_code >> 8) & 0xFF;
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if(m_glyphs[msb] == 0)
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{
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m_glyphs[msb] =
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(glyph_cache**)m_allocator.allocate(sizeof(glyph_cache*) * 256,
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sizeof(glyph_cache*));
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std::memset(m_glyphs[msb], 0, sizeof(glyph_cache*) * 256);
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}
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unsigned lsb = glyph_code & 0xFF;
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if(m_glyphs[msb][lsb]) return 0; // Already exists, do not overwrite
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glyph_cache* glyph =
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(glyph_cache*)m_allocator.allocate(sizeof(glyph_cache),
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sizeof(double));
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glyph->glyph_index = glyph_index;
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glyph->data = m_allocator.allocate(data_size);
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glyph->data_size = data_size;
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glyph->data_type = data_type;
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glyph->bounds = bounds;
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glyph->advance_x = advance_x;
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glyph->advance_y = advance_y;
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return m_glyphs[msb][lsb] = glyph;
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}
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private:
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block_allocator m_allocator;
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glyph_cache** m_glyphs[256];
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char* m_font_signature;
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};
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//---------------------------------------------------------font_cache_pool
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class font_cache_pool
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{
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public:
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//--------------------------------------------------------------------
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~font_cache_pool()
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{
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unsigned i;
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for(i = 0; i < m_num_fonts; ++i)
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{
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obj_allocator<font_cache>::deallocate(m_fonts[i]);
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}
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pod_allocator<font_cache*>::deallocate(m_fonts, m_max_fonts);
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}
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//--------------------------------------------------------------------
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font_cache_pool(unsigned max_fonts=32) :
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m_fonts(pod_allocator<font_cache*>::allocate(max_fonts)),
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m_max_fonts(max_fonts),
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m_num_fonts(0),
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m_cur_font(0)
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{}
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//--------------------------------------------------------------------
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void font(const char* font_signature, bool reset_cache = false)
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{
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int idx = find_font(font_signature);
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if(idx >= 0)
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{
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if(reset_cache)
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{
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obj_allocator<font_cache>::deallocate(m_fonts[idx]);
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m_fonts[idx] = obj_allocator<font_cache>::allocate();
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m_fonts[idx]->signature(font_signature);
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}
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m_cur_font = m_fonts[idx];
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}
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else
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{
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if(m_num_fonts >= m_max_fonts)
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{
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obj_allocator<font_cache>::deallocate(m_fonts[0]);
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std::memcpy(m_fonts,
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m_fonts + 1,
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(m_max_fonts - 1) * sizeof(font_cache*));
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m_num_fonts = m_max_fonts - 1;
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}
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m_fonts[m_num_fonts] = obj_allocator<font_cache>::allocate();
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m_fonts[m_num_fonts]->signature(font_signature);
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m_cur_font = m_fonts[m_num_fonts];
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++m_num_fonts;
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}
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}
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//--------------------------------------------------------------------
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const font_cache* font() const
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{
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return m_cur_font;
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}
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//--------------------------------------------------------------------
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const glyph_cache* find_glyph(unsigned glyph_code) const
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{
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if(m_cur_font) return m_cur_font->find_glyph(glyph_code);
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return 0;
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}
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//--------------------------------------------------------------------
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glyph_cache* cache_glyph(unsigned glyph_code,
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unsigned glyph_index,
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unsigned data_size,
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glyph_data_type data_type,
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const rect_i& bounds,
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double advance_x,
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double advance_y)
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{
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if(m_cur_font)
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{
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return m_cur_font->cache_glyph(glyph_code,
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glyph_index,
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data_size,
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data_type,
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bounds,
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advance_x,
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advance_y);
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}
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return 0;
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}
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//--------------------------------------------------------------------
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int find_font(const char* font_signature)
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{
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unsigned i;
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for(i = 0; i < m_num_fonts; i++)
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{
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if(m_fonts[i]->font_is(font_signature)) return int(i);
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}
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return -1;
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}
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private:
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font_cache** m_fonts;
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unsigned m_max_fonts;
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unsigned m_num_fonts;
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font_cache* m_cur_font;
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};
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//------------------------------------------------------------------------
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enum glyph_rendering
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{
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glyph_ren_native_mono,
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glyph_ren_native_gray8,
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glyph_ren_outline,
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glyph_ren_agg_mono,
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glyph_ren_agg_gray8
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};
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//------------------------------------------------------font_cache_manager
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template<class FontEngine> class font_cache_manager
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{
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public:
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typedef FontEngine font_engine_type;
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typedef font_cache_manager<FontEngine> self_type;
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typedef typename font_engine_type::path_adaptor_type path_adaptor_type;
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typedef typename font_engine_type::gray8_adaptor_type gray8_adaptor_type;
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typedef typename gray8_adaptor_type::embedded_scanline gray8_scanline_type;
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typedef typename font_engine_type::mono_adaptor_type mono_adaptor_type;
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typedef typename mono_adaptor_type::embedded_scanline mono_scanline_type;
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//--------------------------------------------------------------------
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font_cache_manager(font_engine_type& engine, unsigned max_fonts=32) :
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m_fonts(max_fonts),
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m_engine(engine),
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m_change_stamp(-1),
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m_prev_glyph(0),
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m_last_glyph(0)
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{}
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//--------------------------------------------------------------------
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void reset_last_glyph()
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{
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m_prev_glyph = m_last_glyph = 0;
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}
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//--------------------------------------------------------------------
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const glyph_cache* glyph(unsigned glyph_code)
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{
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synchronize();
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const glyph_cache* gl = m_fonts.find_glyph(glyph_code);
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if(gl)
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{
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m_prev_glyph = m_last_glyph;
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return m_last_glyph = gl;
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}
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else
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{
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if(m_engine.prepare_glyph(glyph_code))
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{
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m_prev_glyph = m_last_glyph;
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m_last_glyph = m_fonts.cache_glyph(glyph_code,
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m_engine.glyph_index(),
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m_engine.data_size(),
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m_engine.data_type(),
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m_engine.bounds(),
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m_engine.advance_x(),
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m_engine.advance_y());
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m_engine.write_glyph_to(m_last_glyph->data);
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return m_last_glyph;
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}
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}
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return 0;
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}
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//--------------------------------------------------------------------
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void init_embedded_adaptors(const glyph_cache* gl,
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double x, double y,
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double scale=1.0)
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{
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if(gl)
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{
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switch(gl->data_type)
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{
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default: return;
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case glyph_data_mono:
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m_mono_adaptor.init(gl->data, gl->data_size, x, y);
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break;
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case glyph_data_gray8:
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m_gray8_adaptor.init(gl->data, gl->data_size, x, y);
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break;
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case glyph_data_outline:
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m_path_adaptor.init(gl->data, gl->data_size, x, y, scale);
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break;
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}
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}
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}
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//--------------------------------------------------------------------
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path_adaptor_type& path_adaptor() { return m_path_adaptor; }
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gray8_adaptor_type& gray8_adaptor() { return m_gray8_adaptor; }
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gray8_scanline_type& gray8_scanline() { return m_gray8_scanline; }
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mono_adaptor_type& mono_adaptor() { return m_mono_adaptor; }
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mono_scanline_type& mono_scanline() { return m_mono_scanline; }
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//--------------------------------------------------------------------
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const glyph_cache* perv_glyph() const { return m_prev_glyph; }
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const glyph_cache* last_glyph() const { return m_last_glyph; }
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//--------------------------------------------------------------------
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bool add_kerning(double* x, double* y)
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{
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if(m_prev_glyph && m_last_glyph)
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{
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return m_engine.add_kerning(m_prev_glyph->glyph_index,
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m_last_glyph->glyph_index,
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x, y);
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}
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return false;
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}
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//--------------------------------------------------------------------
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void precache(unsigned from, unsigned to)
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{
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for(; from <= to; ++from) glyph(from);
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}
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//--------------------------------------------------------------------
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void reset_cache()
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{
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m_fonts.font(m_engine.font_signature(), true);
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m_change_stamp = m_engine.change_stamp();
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m_prev_glyph = m_last_glyph = 0;
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}
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private:
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//--------------------------------------------------------------------
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font_cache_manager(const self_type&);
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const self_type& operator = (const self_type&);
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//--------------------------------------------------------------------
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void synchronize()
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{
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if(m_change_stamp != m_engine.change_stamp())
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{
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m_fonts.font(m_engine.font_signature());
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m_change_stamp = m_engine.change_stamp();
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m_prev_glyph = m_last_glyph = 0;
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}
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}
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font_cache_pool m_fonts;
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font_engine_type& m_engine;
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int m_change_stamp;
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double m_dx;
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double m_dy;
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const glyph_cache* m_prev_glyph;
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const glyph_cache* m_last_glyph;
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path_adaptor_type m_path_adaptor;
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gray8_adaptor_type m_gray8_adaptor;
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gray8_scanline_type m_gray8_scanline;
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mono_adaptor_type m_mono_adaptor;
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mono_scanline_type m_mono_scanline;
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};
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}
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#endif
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