1 /* 2 * Copyright 2007, Haiku. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Maxim Shemanarev <mcseemagg@yahoo.com> 7 * Stephan Aßmus <superstippi@gmx.de> 8 * Andrej Spielmann, <andrej.spielmann@seh.ox.ac.uk> 9 */ 10 11 //---------------------------------------------------------------------------- 12 // Anti-Grain Geometry - Version 2.4 13 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) 14 // 15 // Permission to copy, use, modify, sell and distribute this software 16 // is granted provided this copyright notice appears in all copies. 17 // This software is provided "as is" without express or implied 18 // warranty, and with no claim as to its suitability for any purpose. 19 // 20 //---------------------------------------------------------------------------- 21 // Contact: mcseem@antigrain.com 22 // mcseemagg@yahoo.com 23 // http://www.antigrain.com 24 //---------------------------------------------------------------------------- 25 26 #ifndef FONT_ENGINE_H 27 #define FONT_ENGINE_H 28 29 #include <SupportDefs.h> 30 31 #include <ft2build.h> 32 #include FT_FREETYPE_H 33 34 #include <agg_scanline_storage_aa.h> 35 #include <agg_scanline_storage_bin.h> 36 #include <agg_scanline_u.h> 37 #include <agg_scanline_bin.h> 38 #include <agg_path_storage_integer.h> 39 #include <agg_rasterizer_scanline_aa.h> 40 #include <agg_conv_curve.h> 41 #include <agg_trans_affine.h> 42 43 #include "agg_scanline_storage_subpix.h" 44 #include "agg_scanline_u_subpix.h" 45 #include "agg_scanline_u_subpix_avrg_filtering.h" 46 47 #include "GlobalSubpixelSettings.h" 48 49 50 enum glyph_rendering { 51 glyph_ren_native_mono, 52 glyph_ren_native_gray8, 53 glyph_ren_outline, 54 glyph_ren_subpix 55 }; 56 57 58 enum glyph_data_type { 59 glyph_data_invalid = 0, 60 glyph_data_mono = 1, 61 glyph_data_gray8 = 2, 62 glyph_data_outline = 3, 63 glyph_data_subpix = 4 64 }; 65 66 67 class FontEngine { 68 public: 69 typedef agg::serialized_scanlines_adaptor_subpix<uint8> SubpixAdapter; 70 typedef agg::serialized_scanlines_adaptor_aa<uint8> Gray8Adapter; 71 typedef agg::serialized_scanlines_adaptor_bin MonoAdapter; 72 typedef agg::scanline_storage_aa8 ScanlineStorageAA; 73 typedef agg::scanline_storage_subpix8 ScanlineStorageSubpix; 74 typedef agg::scanline_storage_bin ScanlineStorageBin; 75 typedef agg::serialized_integer_path_adaptor<int32, 6> PathAdapter; 76 77 FontEngine(); 78 virtual ~FontEngine(); 79 80 bool Init(const char* fontFilePath, 81 unsigned face_index, double size, 82 FT_Encoding char_map, 83 glyph_rendering ren_type, 84 bool hinting, 85 const void* fontFileBuffer = NULL, 86 const long fontFileBufferSize = 0); 87 88 int LastError() const 89 { return fLastError; } 90 unsigned CountFaces() const; 91 bool Hinting() const 92 { return fHinting; } 93 94 95 uint32 GlyphIndexForGlyphCode(uint32 glyphCode) const; 96 bool PrepareGlyph(uint32 glyphIndex); 97 98 uint32 DataSize() const 99 { return fDataSize; } 100 glyph_data_type DataType() const 101 { return fDataType; } 102 const agg::rect_i& Bounds() const 103 { return fBounds; } 104 double AdvanceX() const 105 { return fAdvanceX; } 106 double AdvanceY() const 107 { return fAdvanceY; } 108 double PreciseAdvanceX() const 109 { return fPreciseAdvanceX; } 110 double PreciseAdvanceY() const 111 { return fPreciseAdvanceY; } 112 double InsetLeft() const 113 { return fInsetLeft; } 114 double InsetRight() const 115 { return fInsetRight; } 116 117 void WriteGlyphTo(uint8* data) const; 118 119 120 bool GetKerning(uint32 first, uint32 second, 121 double* x, double* y); 122 123 private: 124 // disallowed stuff: 125 FontEngine(const FontEngine&); 126 const FontEngine& operator=(const FontEngine&); 127 128 int fLastError; 129 bool fLibraryInitialized; 130 FT_Library fLibrary; // handle to library 131 FT_Face fFace; // FreeType font face handle 132 133 glyph_rendering fGlyphRendering; 134 bool fHinting; 135 136 // members needed to generate individual glyphs according 137 // to glyph rendering type 138 uint32 fDataSize; 139 glyph_data_type fDataType; 140 agg::rect_i fBounds; 141 double fAdvanceX; 142 double fAdvanceY; 143 double fPreciseAdvanceX; 144 double fPreciseAdvanceY; 145 double fInsetLeft; 146 double fInsetRight; 147 148 // these members are for caching memory allocations 149 // when rendering glyphs 150 typedef agg::path_storage_integer<int32, 6> PathStorageType; 151 typedef agg::conv_curve<PathStorageType> CurveConverterType; 152 153 PathStorageType fPath; 154 CurveConverterType fCurves; 155 agg::scanline_u8 fScanlineAA; 156 agg::scanline_bin fScanlineBin; 157 #ifdef AVERAGE_BASED_SUBPIXEL_FILTERING 158 agg::scanline_u8_subpix_avrg_filtering fScanlineSubpix; 159 #else 160 agg::scanline_u8_subpix fScanlineSubpix; 161 #endif 162 163 ScanlineStorageAA fScanlineStorageAA; 164 ScanlineStorageBin fScanlineStorageBin; 165 ScanlineStorageSubpix fScanlineStorageSubpix; 166 }; 167 168 169 #endif // FONT_ENGINE_H 170