[692] | 1 | /***************************************************************************/
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| 2 | /* */
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| 3 | /* ftdriver.h */
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| 4 | /* */
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| 5 | /* FreeType font driver interface (specification). */
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| 6 | /* */
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| 7 | /* Copyright 1996-2001, 2002, 2003 by */
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| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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| 9 | /* */
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| 10 | /* This file is part of the FreeType project, and may only be used, */
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| 11 | /* modified, and distributed under the terms of the FreeType project */
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| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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| 13 | /* this file you indicate that you have read the license and */
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| 14 | /* understand and accept it fully. */
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| 15 | /* */
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| 16 | /***************************************************************************/
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| 17 |
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| 18 |
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| 19 | #ifndef __FTDRIVER_H__
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| 20 | #define __FTDRIVER_H__
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| 21 |
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| 22 |
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| 23 | #include <ft2build.h>
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| 24 | #include FT_MODULE_H
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| 25 |
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| 26 |
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| 27 | FT_BEGIN_HEADER
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| 28 |
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| 29 |
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| 30 | typedef FT_Error
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| 31 | (*FT_Face_InitFunc)( FT_Stream stream,
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| 32 | FT_Face face,
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| 33 | FT_Int typeface_index,
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| 34 | FT_Int num_params,
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| 35 | FT_Parameter* parameters );
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| 36 |
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| 37 | typedef void
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| 38 | (*FT_Face_DoneFunc)( FT_Face face );
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| 39 |
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| 40 |
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| 41 | typedef FT_Error
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| 42 | (*FT_Size_InitFunc)( FT_Size size );
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| 43 |
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| 44 | typedef void
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| 45 | (*FT_Size_DoneFunc)( FT_Size size );
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| 46 |
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| 47 |
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| 48 | typedef FT_Error
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| 49 | (*FT_Slot_InitFunc)( FT_GlyphSlot slot );
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| 50 |
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| 51 | typedef void
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| 52 | (*FT_Slot_DoneFunc)( FT_GlyphSlot slot );
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| 53 |
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| 54 |
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| 55 | typedef FT_Error
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| 56 | (*FT_Size_ResetPointsFunc)( FT_Size size,
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| 57 | FT_F26Dot6 char_width,
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| 58 | FT_F26Dot6 char_height,
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| 59 | FT_UInt horz_resolution,
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| 60 | FT_UInt vert_resolution );
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| 61 |
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| 62 | typedef FT_Error
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| 63 | (*FT_Size_ResetPixelsFunc)( FT_Size size,
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| 64 | FT_UInt pixel_width,
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| 65 | FT_UInt pixel_height );
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| 66 |
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| 67 | typedef FT_Error
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| 68 | (*FT_Slot_LoadFunc)( FT_GlyphSlot slot,
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| 69 | FT_Size size,
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| 70 | FT_UInt glyph_index,
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| 71 | FT_Int32 load_flags );
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| 72 |
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| 73 |
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| 74 | typedef FT_UInt
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| 75 | (*FT_CharMap_CharIndexFunc)( FT_CharMap charmap,
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| 76 | FT_Long charcode );
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| 77 |
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| 78 | typedef FT_Long
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| 79 | (*FT_CharMap_CharNextFunc)( FT_CharMap charmap,
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| 80 | FT_Long charcode );
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| 81 |
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| 82 | typedef FT_Error
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| 83 | (*FT_Face_GetKerningFunc)( FT_Face face,
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| 84 | FT_UInt left_glyph,
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| 85 | FT_UInt right_glyph,
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| 86 | FT_Vector* kerning );
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| 87 |
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| 88 |
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| 89 | typedef FT_Error
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| 90 | (*FT_Face_AttachFunc)( FT_Face face,
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| 91 | FT_Stream stream );
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| 92 |
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| 93 |
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| 94 | typedef FT_Error
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| 95 | (*FT_Face_GetAdvancesFunc)( FT_Face face,
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| 96 | FT_UInt first,
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| 97 | FT_UInt count,
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| 98 | FT_Bool vertical,
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| 99 | FT_UShort* advances );
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| 100 |
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| 101 |
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| 102 | /*************************************************************************/
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| 103 | /* */
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| 104 | /* <Struct> */
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| 105 | /* FT_Driver_ClassRec */
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| 106 | /* */
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| 107 | /* <Description> */
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| 108 | /* The font driver class. This structure mostly contains pointers to */
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| 109 | /* driver methods. */
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| 110 | /* */
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| 111 | /* <Fields> */
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| 112 | /* root :: The parent module. */
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| 113 | /* */
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| 114 | /* face_object_size :: The size of a face object in bytes. */
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| 115 | /* */
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| 116 | /* size_object_size :: The size of a size object in bytes. */
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| 117 | /* */
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| 118 | /* slot_object_size :: The size of a glyph object in bytes. */
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| 119 | /* */
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| 120 | /* init_face :: The format-specific face constructor. */
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| 121 | /* */
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| 122 | /* done_face :: The format-specific face destructor. */
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| 123 | /* */
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| 124 | /* init_size :: The format-specific size constructor. */
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| 125 | /* */
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| 126 | /* done_size :: The format-specific size destructor. */
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| 127 | /* */
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| 128 | /* init_slot :: The format-specific slot constructor. */
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| 129 | /* */
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| 130 | /* done_slot :: The format-specific slot destructor. */
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| 131 | /* */
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| 132 | /* set_char_sizes :: A handle to a function used to set the new */
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| 133 | /* character size in points + resolution. Can be */
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| 134 | /* set to 0 to indicate default behaviour. */
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| 135 | /* */
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| 136 | /* set_pixel_sizes :: A handle to a function used to set the new */
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| 137 | /* character size in pixels. Can be set to 0 to */
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| 138 | /* indicate default behaviour. */
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| 139 | /* */
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| 140 | /* load_glyph :: A function handle to load a given glyph image */
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| 141 | /* in a slot. This field is mandatory! */
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| 142 | /* */
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| 143 | /* get_char_index :: A function handle to return the glyph index of */
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| 144 | /* a given character for a given charmap. This */
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| 145 | /* field is mandatory! */
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| 146 | /* */
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| 147 | /* get_kerning :: A function handle to return the unscaled */
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| 148 | /* kerning for a given pair of glyphs. Can be */
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| 149 | /* set to 0 if the format doesn't support */
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| 150 | /* kerning. */
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| 151 | /* */
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| 152 | /* attach_file :: This function handle is used to read */
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| 153 | /* additional data for a face from another */
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| 154 | /* file/stream. For example, this can be used to */
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| 155 | /* add data from AFM or PFM files on a Type 1 */
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| 156 | /* face, or a CIDMap on a CID-keyed face. */
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| 157 | /* */
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| 158 | /* get_advances :: A function handle used to return advance */
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| 159 | /* widths of 'count' glyphs (in font units), */
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| 160 | /* starting at `first'. The `vertical' flag must */
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| 161 | /* be set to get vertical advance heights. The */
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| 162 | /* `advances' buffer is caller-allocated. */
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| 163 | /* Currently not implemented. The idea of this */
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| 164 | /* function is to be able to perform */
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| 165 | /* device-independent text layout without loading */
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| 166 | /* a single glyph image. */
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| 167 | /* */
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| 168 | /* <Note> */
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| 169 | /* Most function pointers, with the exception of `load_glyph' and */
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| 170 | /* `get_char_index' can be set to 0 to indicate a default behaviour. */
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| 171 | /* */
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| 172 | typedef struct FT_Driver_ClassRec_
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| 173 | {
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| 174 | FT_Module_Class root;
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| 175 |
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| 176 | FT_Long face_object_size;
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| 177 | FT_Long size_object_size;
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| 178 | FT_Long slot_object_size;
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| 179 |
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| 180 | FT_Face_InitFunc init_face;
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| 181 | FT_Face_DoneFunc done_face;
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| 182 |
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| 183 | FT_Size_InitFunc init_size;
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| 184 | FT_Size_DoneFunc done_size;
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| 185 |
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| 186 | FT_Slot_InitFunc init_slot;
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| 187 | FT_Slot_DoneFunc done_slot;
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| 188 |
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| 189 | FT_Size_ResetPointsFunc set_char_sizes;
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| 190 | FT_Size_ResetPixelsFunc set_pixel_sizes;
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| 191 |
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| 192 | FT_Slot_LoadFunc load_glyph;
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| 193 |
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| 194 | FT_Face_GetKerningFunc get_kerning;
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| 195 | FT_Face_AttachFunc attach_file;
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| 196 | FT_Face_GetAdvancesFunc get_advances;
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| 197 |
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| 198 | } FT_Driver_ClassRec, *FT_Driver_Class;
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| 199 |
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| 200 |
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| 201 | FT_END_HEADER
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| 202 |
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| 203 | #endif /* __FTDRIVER_H__ */
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| 204 |
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| 205 |
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| 206 | /* END */
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