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Diffstat (limited to 'agg/inc/agg_font_cache_manager.h')
-rwxr-xr-x | agg/inc/agg_font_cache_manager.h | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/agg/inc/agg_font_cache_manager.h b/agg/inc/agg_font_cache_manager.h new file mode 100755 index 000000000000..55c4d39db75d --- /dev/null +++ b/agg/inc/agg_font_cache_manager.h @@ -0,0 +1,397 @@ +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// 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_MANAGER_INCLUDED +#define AGG_FONT_CACHE_MANAGER_INCLUDED + +#include <string.h> +#include "agg_array.h" + +namespace agg +{ + + //---------------------------------------------------------glyph_data_type + enum glyph_data_type + { + glyph_data_invalid = 0, + glyph_data_mono = 1, + glyph_data_gray8 = 2, + glyph_data_outline = 3 + }; + + + //-------------------------------------------------------------glyph_cache + struct glyph_cache + { + unsigned glyph_index; + int8u* data; + unsigned data_size; + glyph_data_type data_type; + rect bounds; + double advance_x; + double advance_y; + }; + + + //--------------------------------------------------------------font_cache + class font_cache + { + public: + enum { block_size = 16384-16 }; + + //-------------------------------------------------------------------- + font_cache(const char* font_signature) : + m_allocator(block_size), + m_font_signature(0) + { + m_font_signature = (char*)m_allocator.allocate(strlen(font_signature) + 1); + strcpy(m_font_signature, font_signature); + memset(m_glyphs, 0, sizeof(m_glyphs)); + } + + //-------------------------------------------------------------------- + bool font_is(const char* font_signature) const + { + return strcmp(font_signature, m_font_signature) == 0; + } + + //-------------------------------------------------------------------- + const glyph_cache* 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; + } + + //-------------------------------------------------------------------- + glyph_cache* cache_glyph(unsigned glyph_code, + unsigned glyph_index, + unsigned data_size, + glyph_data_type data_type, + const rect& bounds, + double advance_x, + double advance_y) + { + unsigned msb = (glyph_code >> 8) & 0xFF; + if(m_glyphs[msb] == 0) + { + m_glyphs[msb] = + (glyph_cache**)m_allocator.allocate(sizeof(glyph_cache*) * 256, + sizeof(glyph_cache*)); + memset(m_glyphs[msb], 0, sizeof(glyph_cache*) * 256); + } + + unsigned lsb = glyph_code & 0xFF; + if(m_glyphs[msb][lsb]) return 0; // Already exists, do not overwrite + + glyph_cache* glyph = + (glyph_cache*)m_allocator.allocate(sizeof(glyph_cache), + sizeof(double)); + + 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: + pod_allocator m_allocator; + glyph_cache** m_glyphs[256]; + char* m_font_signature; + }; + + + + + + + + //---------------------------------------------------------font_cache_pool + class font_cache_pool + { + public: + //-------------------------------------------------------------------- + ~font_cache_pool() + { + unsigned i; + for(i = 0; i < m_num_fonts; ++i) + { + delete m_fonts[i]; + } + delete [] m_fonts; + } + + //-------------------------------------------------------------------- + font_cache_pool(unsigned max_fonts=32) : + m_fonts(new font_cache* [max_fonts]), + m_max_fonts(max_fonts), + m_num_fonts(0), + m_cur_font(0) + {} + + + //-------------------------------------------------------------------- + void font(const char* font_signature, bool reset_cache = false) + { + int idx = find_font(font_signature); + if(idx >= 0) + { + if(reset_cache) + { + delete m_fonts[idx]; + m_fonts[idx] = new font_cache(font_signature); + } + m_cur_font = m_fonts[idx]; + } + else + { + if(m_num_fonts >= m_max_fonts) + { + delete m_fonts[0]; + memcpy(m_fonts, + m_fonts + 1, + (m_max_fonts - 1) * sizeof(font_cache*)); + m_num_fonts = m_max_fonts - 1; + } + m_fonts[m_num_fonts] = new font_cache(font_signature); + m_cur_font = m_fonts[m_num_fonts]; + ++m_num_fonts; + } + } + + //-------------------------------------------------------------------- + const font_cache* font() const + { + return m_cur_font; + } + + //-------------------------------------------------------------------- + const glyph_cache* find_glyph(unsigned glyph_code) const + { + if(m_cur_font) return m_cur_font->find_glyph(glyph_code); + return 0; + } + + //-------------------------------------------------------------------- + glyph_cache* cache_glyph(unsigned glyph_code, + unsigned glyph_index, + unsigned data_size, + glyph_data_type data_type, + const rect& bounds, + double advance_x, + double advance_y) + { + if(m_cur_font) + { + return m_cur_font->cache_glyph(glyph_code, + glyph_index, + data_size, + data_type, + bounds, + advance_x, + advance_y); + } + return 0; + } + + + //-------------------------------------------------------------------- + int find_font(const char* font_signature) + { + unsigned i; + for(i = 0; i < m_num_fonts; i++) + { + if(m_fonts[i]->font_is(font_signature)) return int(i); + } + return -1; + } + + private: + font_cache** m_fonts; + unsigned m_max_fonts; + unsigned m_num_fonts; + font_cache* m_cur_font; + }; + + + + + //------------------------------------------------------------------------ + 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; + + //-------------------------------------------------------------------- + font_cache_manager(font_engine_type& engine, unsigned max_fonts=32) : + m_fonts(max_fonts), + m_engine(engine), + m_change_stamp(-1), + m_prev_glyph(0), + m_last_glyph(0) + {} + + //-------------------------------------------------------------------- + const glyph_cache* glyph(unsigned glyph_code) + { + synchronize(); + const glyph_cache* gl = m_fonts.find_glyph(glyph_code); + if(gl) + { + m_prev_glyph = m_last_glyph; + return m_last_glyph = gl; + } + else + { + if(m_engine.prepare_glyph(glyph_code)) + { + m_prev_glyph = m_last_glyph; + m_last_glyph = m_fonts.cache_glyph(glyph_code, + m_engine.glyph_index(), + m_engine.data_size(), + m_engine.data_type(), + m_engine.bounds(), + m_engine.advance_x(), + m_engine.advance_y()); + m_engine.write_glyph_to(m_last_glyph->data); + return m_last_glyph; + } + } + return 0; + } + + //-------------------------------------------------------------------- + void init_embedded_adaptors(const glyph_cache* 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; } + + //-------------------------------------------------------------------- + const glyph_cache* perv_glyph() const { return m_prev_glyph; } + const glyph_cache* last_glyph() const { return m_last_glyph; } + + //-------------------------------------------------------------------- + bool add_kerning(double* x, double* y) + { + if(m_prev_glyph && m_last_glyph) + { + return m_engine.add_kerning(m_prev_glyph->glyph_index, + m_last_glyph->glyph_index, + x, y); + } + return false; + } + + //-------------------------------------------------------------------- + void precache(unsigned from, unsigned to) + { + for(; from <= to; ++from) glyph(from); + } + + //-------------------------------------------------------------------- + void reset_cache() + { + m_fonts.font(m_engine.font_signature(), true); + m_change_stamp = m_engine.change_stamp(); + m_prev_glyph = m_last_glyph = 0; + } + + private: + //-------------------------------------------------------------------- + font_cache_manager(const self_type&); + const self_type& operator = (const self_type&); + + //-------------------------------------------------------------------- + void synchronize() + { + if(m_change_stamp != m_engine.change_stamp()) + { + m_fonts.font(m_engine.font_signature()); + m_change_stamp = m_engine.change_stamp(); + m_prev_glyph = m_last_glyph = 0; + } + } + + font_cache_pool m_fonts; + font_engine_type& m_engine; + int m_change_stamp; + double m_dx; + double m_dy; + const glyph_cache* m_prev_glyph; + const glyph_cache* m_last_glyph; + 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 + |