[692] | 1 | /***************************************************************************/
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| 2 | /* */
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| 3 | /* ftoutln.h */
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| 4 | /* */
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| 5 | /* Support for the FT_Outline type used to store glyph shapes of */
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| 6 | /* most scalable font formats (specification). */
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| 7 | /* */
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| 8 | /* Copyright 1996-2001, 2002, 2003, 2005 by */
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| 9 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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| 10 | /* */
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| 11 | /* This file is part of the FreeType project, and may only be used, */
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| 12 | /* modified, and distributed under the terms of the FreeType project */
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| 13 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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| 14 | /* this file you indicate that you have read the license and */
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| 15 | /* understand and accept it fully. */
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| 16 | /* */
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| 17 | /***************************************************************************/
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| 18 |
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| 19 |
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| 20 | #ifndef __FTOUTLN_H__
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| 21 | #define __FTOUTLN_H__
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| 22 |
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| 23 |
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| 24 | #include <ft2build.h>
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| 25 | #include FT_FREETYPE_H
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| 26 |
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| 27 | #ifdef FREETYPE_H
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| 28 | #error "freetype.h of FreeType 1 has been loaded!"
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| 29 | #error "Please fix the directory search order for header files"
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| 30 | #error "so that freetype.h of FreeType 2 is found first."
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| 31 | #endif
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| 32 |
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| 33 |
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| 34 | FT_BEGIN_HEADER
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| 35 |
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| 36 |
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| 37 | /*************************************************************************/
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| 38 | /* */
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| 39 | /* <Section> */
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| 40 | /* outline_processing */
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| 41 | /* */
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| 42 | /* <Title> */
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| 43 | /* Outline Processing */
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| 44 | /* */
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| 45 | /* <Abstract> */
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| 46 | /* Functions to create, transform, and render vectorial glyph images. */
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| 47 | /* */
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| 48 | /* <Description> */
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| 49 | /* This section contains routines used to create and destroy scalable */
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| 50 | /* glyph images known as `outlines'. These can also be measured, */
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| 51 | /* transformed, and converted into bitmaps and pixmaps. */
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| 52 | /* */
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| 53 | /* <Order> */
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| 54 | /* FT_Outline */
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| 55 | /* FT_OUTLINE_FLAGS */
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| 56 | /* FT_Outline_New */
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| 57 | /* FT_Outline_Done */
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| 58 | /* FT_Outline_Copy */
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| 59 | /* FT_Outline_Translate */
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| 60 | /* FT_Outline_Transform */
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| 61 | /* FT_Outline_Embolden */
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| 62 | /* FT_Outline_Reverse */
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| 63 | /* FT_Outline_Check */
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| 64 | /* */
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| 65 | /* FT_Outline_Get_CBox */
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| 66 | /* FT_Outline_Get_BBox */
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| 67 | /* */
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| 68 | /* FT_Outline_Get_Bitmap */
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| 69 | /* FT_Outline_Render */
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| 70 | /* */
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| 71 | /* FT_Outline_Decompose */
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| 72 | /* FT_Outline_Funcs */
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| 73 | /* FT_Outline_MoveTo_Func */
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| 74 | /* FT_Outline_LineTo_Func */
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| 75 | /* FT_Outline_ConicTo_Func */
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| 76 | /* FT_Outline_CubicTo_Func */
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| 77 | /* */
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| 78 | /*************************************************************************/
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| 79 |
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| 80 |
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| 81 | /*************************************************************************/
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| 82 | /* */
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| 83 | /* <Function> */
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| 84 | /* FT_Outline_Decompose */
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| 85 | /* */
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| 86 | /* <Description> */
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| 87 | /* Walks over an outline's structure to decompose it into individual */
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| 88 | /* segments and Bezier arcs. This function is also able to emit */
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| 89 | /* `move to' and `close to' operations to indicate the start and end */
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| 90 | /* of new contours in the outline. */
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| 91 | /* */
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| 92 | /* <Input> */
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| 93 | /* outline :: A pointer to the source target. */
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| 94 | /* */
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| 95 | /* func_interface :: A table of `emitters', i.e,. function pointers */
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| 96 | /* called during decomposition to indicate path */
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| 97 | /* operations. */
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| 98 | /* */
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| 99 | /* <InOut> */
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| 100 | /* user :: A typeless pointer which is passed to each */
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| 101 | /* emitter during the decomposition. It can be */
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| 102 | /* used to store the state during the */
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| 103 | /* decomposition. */
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| 104 | /* */
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| 105 | /* <Return> */
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| 106 | /* FreeType error code. 0 means sucess. */
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| 107 | /* */
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| 108 | FT_EXPORT( FT_Error )
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| 109 | FT_Outline_Decompose( FT_Outline* outline,
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| 110 | const FT_Outline_Funcs* func_interface,
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| 111 | void* user );
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| 112 |
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| 113 |
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| 114 | /*************************************************************************/
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| 115 | /* */
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| 116 | /* <Function> */
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| 117 | /* FT_Outline_New */
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| 118 | /* */
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| 119 | /* <Description> */
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| 120 | /* Creates a new outline of a given size. */
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| 121 | /* */
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| 122 | /* <Input> */
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| 123 | /* library :: A handle to the library object from where the */
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| 124 | /* outline is allocated. Note however that the new */
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| 125 | /* outline will NOT necessarily be FREED, when */
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| 126 | /* destroying the library, by FT_Done_FreeType(). */
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| 127 | /* */
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| 128 | /* numPoints :: The maximal number of points within the outline. */
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| 129 | /* */
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| 130 | /* numContours :: The maximal number of contours within the outline. */
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| 131 | /* */
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| 132 | /* <Output> */
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| 133 | /* anoutline :: A handle to the new outline. NULL in case of */
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| 134 | /* error. */
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| 135 | /* */
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| 136 | /* <Return> */
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| 137 | /* FreeType error code. 0 means success. */
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| 138 | /* */
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| 139 | /* <Note> */
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| 140 | /* The reason why this function takes a `library' parameter is simply */
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| 141 | /* to use the library's memory allocator. */
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| 142 | /* */
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| 143 | FT_EXPORT( FT_Error )
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| 144 | FT_Outline_New( FT_Library library,
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| 145 | FT_UInt numPoints,
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| 146 | FT_Int numContours,
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| 147 | FT_Outline *anoutline );
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| 148 |
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| 149 |
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| 150 | FT_EXPORT( FT_Error )
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| 151 | FT_Outline_New_Internal( FT_Memory memory,
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| 152 | FT_UInt numPoints,
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| 153 | FT_Int numContours,
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| 154 | FT_Outline *anoutline );
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| 155 |
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| 156 |
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| 157 | /*************************************************************************/
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| 158 | /* */
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| 159 | /* <Function> */
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| 160 | /* FT_Outline_Done */
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| 161 | /* */
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| 162 | /* <Description> */
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| 163 | /* Destroys an outline created with FT_Outline_New(). */
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| 164 | /* */
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| 165 | /* <Input> */
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| 166 | /* library :: A handle of the library object used to allocate the */
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| 167 | /* outline. */
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| 168 | /* */
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| 169 | /* outline :: A pointer to the outline object to be discarded. */
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| 170 | /* */
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| 171 | /* <Return> */
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| 172 | /* FreeType error code. 0 means success. */
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| 173 | /* */
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| 174 | /* <Note> */
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| 175 | /* If the outline's `owner' field is not set, only the outline */
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| 176 | /* descriptor will be released. */
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| 177 | /* */
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| 178 | /* The reason why this function takes an `library' parameter is */
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| 179 | /* simply to use FT_Free(). */
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| 180 | /* */
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| 181 | FT_EXPORT( FT_Error )
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| 182 | FT_Outline_Done( FT_Library library,
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| 183 | FT_Outline* outline );
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| 184 |
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| 185 |
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| 186 | FT_EXPORT( FT_Error )
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| 187 | FT_Outline_Done_Internal( FT_Memory memory,
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| 188 | FT_Outline* outline );
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| 189 |
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| 190 |
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| 191 | /*************************************************************************/
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| 192 | /* */
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| 193 | /* <Function> */
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| 194 | /* FT_Outline_Check */
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| 195 | /* */
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| 196 | /* <Description> */
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| 197 | /* Check the contents of an outline descriptor. */
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| 198 | /* */
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| 199 | /* <Input> */
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| 200 | /* outline :: A handle to a source outline. */
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| 201 | /* */
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| 202 | /* <Return> */
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| 203 | /* FreeType error code. 0 means success. */
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| 204 | /* */
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| 205 | FT_EXPORT( FT_Error )
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| 206 | FT_Outline_Check( FT_Outline* outline );
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| 207 |
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| 208 |
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| 209 | /*************************************************************************/
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| 210 | /* */
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| 211 | /* <Function> */
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| 212 | /* FT_Outline_Get_CBox */
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| 213 | /* */
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| 214 | /* <Description> */
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| 215 | /* Returns an outline's `control box'. The control box encloses all */
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| 216 | /* the outline's points, including Bezier control points. Though it */
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| 217 | /* coincides with the exact bounding box for most glyphs, it can be */
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| 218 | /* slightly larger in some situations (like when rotating an outline */
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| 219 | /* which contains Bezier outside arcs). */
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| 220 | /* */
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| 221 | /* Computing the control box is very fast, while getting the bounding */
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| 222 | /* box can take much more time as it needs to walk over all segments */
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| 223 | /* and arcs in the outline. To get the latter, you can use the */
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| 224 | /* `ftbbox' component which is dedicated to this single task. */
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| 225 | /* */
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| 226 | /* <Input> */
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| 227 | /* outline :: A pointer to the source outline descriptor. */
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| 228 | /* */
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| 229 | /* <Output> */
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| 230 | /* acbox :: The outline's control box. */
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| 231 | /* */
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| 232 | FT_EXPORT( void )
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| 233 | FT_Outline_Get_CBox( const FT_Outline* outline,
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| 234 | FT_BBox *acbox );
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| 235 |
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| 236 |
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| 237 | /*************************************************************************/
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| 238 | /* */
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| 239 | /* <Function> */
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| 240 | /* FT_Outline_Translate */
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| 241 | /* */
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| 242 | /* <Description> */
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| 243 | /* Applies a simple translation to the points of an outline. */
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| 244 | /* */
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| 245 | /* <InOut> */
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| 246 | /* outline :: A pointer to the target outline descriptor. */
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| 247 | /* */
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| 248 | /* <Input> */
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| 249 | /* xOffset :: The horizontal offset. */
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| 250 | /* */
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| 251 | /* yOffset :: The vertical offset. */
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| 252 | /* */
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| 253 | FT_EXPORT( void )
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| 254 | FT_Outline_Translate( const FT_Outline* outline,
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| 255 | FT_Pos xOffset,
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| 256 | FT_Pos yOffset );
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| 257 |
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| 258 |
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| 259 | /*************************************************************************/
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| 260 | /* */
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| 261 | /* <Function> */
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| 262 | /* FT_Outline_Copy */
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| 263 | /* */
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| 264 | /* <Description> */
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| 265 | /* Copies an outline into another one. Both objects must have the */
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| 266 | /* same sizes (number of points & number of contours) when this */
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| 267 | /* function is called. */
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| 268 | /* */
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| 269 | /* <Input> */
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| 270 | /* source :: A handle to the source outline. */
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| 271 | /* */
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| 272 | /* <Output> */
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| 273 | /* target :: A handle to the target outline. */
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| 274 | /* */
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| 275 | /* <Return> */
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| 276 | /* FreeType error code. 0 means success. */
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| 277 | /* */
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| 278 | FT_EXPORT( FT_Error )
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| 279 | FT_Outline_Copy( const FT_Outline* source,
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| 280 | FT_Outline *target );
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| 281 |
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| 282 |
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| 283 | /*************************************************************************/
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| 284 | /* */
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| 285 | /* <Function> */
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| 286 | /* FT_Outline_Transform */
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| 287 | /* */
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| 288 | /* <Description> */
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| 289 | /* Applies a simple 2x2 matrix to all of an outline's points. Useful */
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| 290 | /* for applying rotations, slanting, flipping, etc. */
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| 291 | /* */
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| 292 | /* <InOut> */
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| 293 | /* outline :: A pointer to the target outline descriptor. */
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| 294 | /* */
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| 295 | /* <Input> */
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| 296 | /* matrix :: A pointer to the transformation matrix. */
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| 297 | /* */
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| 298 | /* <Note> */
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| 299 | /* You can use FT_Outline_Translate() if you need to translate the */
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| 300 | /* outline's points. */
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| 301 | /* */
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| 302 | FT_EXPORT( void )
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| 303 | FT_Outline_Transform( const FT_Outline* outline,
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| 304 | const FT_Matrix* matrix );
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| 305 |
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| 306 |
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| 307 | /*************************************************************************/
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| 308 | /* */
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| 309 | /* <Function> */
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| 310 | /* FT_Outline_Embolden */
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| 311 | /* */
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| 312 | /* <Description> */
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| 313 | /* Emboldens an outline. The new outline will be at most 4 times */
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| 314 | /* `strength' pixels wider and higher. You may think of the left and */
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| 315 | /* bottom borders as unchanged. */
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| 316 | /* */
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| 317 | /* <InOut> */
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| 318 | /* outline :: A handle to the target outline. */
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| 319 | /* */
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| 320 | /* <Input> */
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| 321 | /* strength :: How strong the glyph is emboldened. Expressed in */
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| 322 | /* 26.6 pixel format. */
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| 323 | /* */
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| 324 | /* <Return> */
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| 325 | /* FreeType error code. 0 means success. */
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| 326 | /* */
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| 327 | FT_EXPORT( FT_Error )
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| 328 | FT_Outline_Embolden( FT_Outline* outline,
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| 329 | FT_Pos strength );
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| 330 |
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| 331 |
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| 332 | /*************************************************************************/
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| 333 | /* */
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| 334 | /* <Function> */
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| 335 | /* FT_Outline_Reverse */
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| 336 | /* */
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| 337 | /* <Description> */
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| 338 | /* Reverses the drawing direction of an outline. This is used to */
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| 339 | /* ensure consistent fill conventions for mirrored glyphs. */
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| 340 | /* */
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| 341 | /* <InOut> */
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| 342 | /* outline :: A pointer to the target outline descriptor. */
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| 343 | /* */
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| 344 | /* <Note> */
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| 345 | /* This functions toggles the bit flag `FT_OUTLINE_REVERSE_FILL' in */
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| 346 | /* the outline's `flags' field. */
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| 347 | /* */
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| 348 | /* It shouldn't be used by a normal client application, unless it */
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| 349 | /* knows what it is doing. */
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| 350 | /* */
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| 351 | FT_EXPORT( void )
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| 352 | FT_Outline_Reverse( FT_Outline* outline );
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| 353 |
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| 354 |
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| 355 | /*************************************************************************/
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| 356 | /* */
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| 357 | /* <Function> */
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| 358 | /* FT_Outline_Get_Bitmap */
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| 359 | /* */
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| 360 | /* <Description> */
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| 361 | /* Renders an outline within a bitmap. The outline's image is simply */
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| 362 | /* OR-ed to the target bitmap. */
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| 363 | /* */
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| 364 | /* <Input> */
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| 365 | /* library :: A handle to a FreeType library object. */
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| 366 | /* */
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| 367 | /* outline :: A pointer to the source outline descriptor. */
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| 368 | /* */
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| 369 | /* <Output> */
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| 370 | /* abitmap :: A pointer to the target bitmap descriptor. */
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| 371 | /* */
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| 372 | /* <Return> */
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| 373 | /* FreeType error code. 0 means success. */
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| 374 | /* */
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| 375 | /* <Note> */
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| 376 | /* This function does NOT CREATE the bitmap, it only renders an */
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| 377 | /* outline image within the one you pass to it! */
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| 378 | /* */
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| 379 | /* It will use the raster correponding to the default glyph format. */
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| 380 | /* */
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| 381 | FT_EXPORT( FT_Error )
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| 382 | FT_Outline_Get_Bitmap( FT_Library library,
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| 383 | FT_Outline* outline,
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| 384 | const FT_Bitmap *abitmap );
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| 385 |
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| 386 |
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| 387 | /*************************************************************************/
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| 388 | /* */
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| 389 | /* <Function> */
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| 390 | /* FT_Outline_Render */
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| 391 | /* */
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| 392 | /* <Description> */
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| 393 | /* Renders an outline within a bitmap using the current scan-convert. */
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| 394 | /* This functions uses an FT_Raster_Params structure as an argument, */
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| 395 | /* allowing advanced features like direct composition, translucency, */
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| 396 | /* etc. */
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| 397 | /* */
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| 398 | /* <Input> */
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| 399 | /* library :: A handle to a FreeType library object. */
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| 400 | /* */
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| 401 | /* outline :: A pointer to the source outline descriptor. */
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| 402 | /* */
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| 403 | /* <InOut> */
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| 404 | /* params :: A pointer to a FT_Raster_Params structure used to */
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| 405 | /* describe the rendering operation. */
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| 406 | /* */
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| 407 | /* <Return> */
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| 408 | /* FreeType error code. 0 means success. */
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| 409 | /* */
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| 410 | /* <Note> */
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| 411 | /* You should know what you are doing and how FT_Raster_Params works */
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| 412 | /* to use this function. */
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| 413 | /* */
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| 414 | /* The field `params.source' will be set to `outline' before the scan */
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| 415 | /* converter is called, which means that the value you give to it is */
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| 416 | /* actually ignored. */
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| 417 | /* */
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| 418 | FT_EXPORT( FT_Error )
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| 419 | FT_Outline_Render( FT_Library library,
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| 420 | FT_Outline* outline,
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| 421 | FT_Raster_Params* params );
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| 422 |
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| 423 |
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| 424 | /**************************************************************************
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| 425 | *
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| 426 | * @enum:
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| 427 | * FT_Orientation
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| 428 | *
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| 429 | * @description:
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| 430 | * A list of values used to describe an outline's contour orientation.
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| 431 | *
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| 432 | * The TrueType and Postscript specifications use different conventions
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| 433 | * to determine whether outline contours should be filled or unfilled.
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| 434 | *
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| 435 | * @values:
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| 436 | * FT_ORIENTATION_TRUETYPE ::
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| 437 | * According to the TrueType specification, clockwise contours must
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| 438 | * be filled, and counter-clockwise ones must be unfilled.
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| 439 | *
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| 440 | * FT_ORIENTATION_POSTSCRIPT ::
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| 441 | * According to the Postscript specification, counter-clockwise contours
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| 442 | * must be filled, and clockwise ones must be unfilled.
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| 443 | *
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| 444 | * FT_ORIENTATION_FILL_RIGHT ::
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| 445 | * This is identical to @FT_ORIENTATION_TRUETYPE, but is used to
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| 446 | * remember that in TrueType, everything that is to the right of
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| 447 | * the drawing direction of a contour must be filled.
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| 448 | *
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| 449 | * FT_ORIENTATION_FILL_LEFT ::
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| 450 | * This is identical to @FT_ORIENTATION_POSTSCRIPT, but is used to
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| 451 | * remember that in Postscript, everything that is to the left of
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| 452 | * the drawing direction of a contour must be filled.
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| 453 | */
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| 454 | typedef enum
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| 455 | {
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| 456 | FT_ORIENTATION_TRUETYPE = 0,
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| 457 | FT_ORIENTATION_POSTSCRIPT = 1,
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| 458 | FT_ORIENTATION_FILL_RIGHT = FT_ORIENTATION_TRUETYPE,
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| 459 | FT_ORIENTATION_FILL_LEFT = FT_ORIENTATION_POSTSCRIPT
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| 460 |
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| 461 | } FT_Orientation;
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| 462 |
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| 463 |
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| 464 | /**************************************************************************
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| 465 | *
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| 466 | * @function:
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| 467 | * FT_Outline_Get_Orientation
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| 468 | *
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| 469 | * @description:
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| 470 | * This function analyzes a glyph outline and tries to compute its
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| 471 | * fill orientation (see @FT_Orientation). This is done by computing
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| 472 | * the direction of each global horizontal and/or vertical extrema
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| 473 | * within the outline.
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| 474 | *
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| 475 | * Note that this will return @FT_ORIENTATION_TRUETYPE for empty
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| 476 | * outlines.
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| 477 | *
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| 478 | * @input:
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| 479 | * outline ::
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| 480 | * A handle to the source outline.
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| 481 | *
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| 482 | * @return:
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| 483 | * The orientation.
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| 484 | *
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| 485 | */
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| 486 | FT_EXPORT( FT_Orientation )
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| 487 | FT_Outline_Get_Orientation( FT_Outline* outline );
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| 488 |
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| 489 |
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| 490 | /* */
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| 491 |
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| 492 |
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| 493 | FT_END_HEADER
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| 494 |
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| 495 | #endif /* __FTOUTLN_H__ */
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| 496 |
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| 497 |
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| 498 | /* END */
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