1 /**************************************************************************** 2 * 3 * ftbbox.h 4 * 5 * FreeType exact bbox computation (specification). 6 * 7 * Copyright 1996-2018 by 8 * David Turner, Robert Wilhelm, and Werner Lemberg. 9 * 10 * This file is part of the FreeType project, and may only be used, 11 * modified, and distributed under the terms of the FreeType project 12 * license, LICENSE.TXT. By continuing to use, modify, or distribute 13 * this file you indicate that you have read the license and 14 * understand and accept it fully. 15 * 16 */ 17 18 19 /************************************************************************** 20 * 21 * This component has a _single_ role: to compute exact outline bounding 22 * boxes. 23 * 24 * It is separated from the rest of the engine for various technical 25 * reasons. It may well be integrated in `ftoutln' later. 26 * 27 */ 28 29 30 #ifndef FTBBOX_H_ 31 #define FTBBOX_H_ 32 33 34 #include <ft2build.h> 35 #include FT_FREETYPE_H 36 37 #ifdef FREETYPE_H 38 #error "freetype.h of FreeType 1 has been loaded!" 39 #error "Please fix the directory search order for header files" 40 #error "so that freetype.h of FreeType 2 is found first." 41 #endif 42 43 44 FT_BEGIN_HEADER 45 46 47 /************************************************************************** 48 * 49 * @section: 50 * outline_processing 51 * 52 */ 53 54 55 /************************************************************************** 56 * 57 * @function: 58 * FT_Outline_Get_BBox 59 * 60 * @description: 61 * Compute the exact bounding box of an outline. This is slower 62 * than computing the control box. However, it uses an advanced 63 * algorithm that returns _very_ quickly when the two boxes 64 * coincide. Otherwise, the outline Bezier arcs are traversed to 65 * extract their extrema. 66 * 67 * @input: 68 * outline :: 69 * A pointer to the source outline. 70 * 71 * @output: 72 * abbox :: 73 * The outline's exact bounding box. 74 * 75 * @return: 76 * FreeType error code. 0~means success. 77 * 78 * @note: 79 * If the font is tricky and the glyph has been loaded with 80 * @FT_LOAD_NO_SCALE, the resulting BBox is meaningless. To get 81 * reasonable values for the BBox it is necessary to load the glyph 82 * at a large ppem value (so that the hinting instructions can 83 * properly shift and scale the subglyphs), then extracting the BBox, 84 * which can be eventually converted back to font units. 85 */ 86 FT_EXPORT( FT_Error ) 87 FT_Outline_Get_BBox( FT_Outline* outline, 88 FT_BBox *abbox ); 89 90 /* */ 91 92 93 FT_END_HEADER 94 95 #endif /* FTBBOX_H_ */ 96 97 98 /* END */ 99 100 101 /* Local Variables: */ 102 /* coding: utf-8 */ 103 /* End: */ 104