1 /**************************************************************************** 2 * 3 * ftbbox.h 4 * 5 * FreeType exact bbox computation (specification). 6 * 7 * Copyright (C) 1996-2019 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 than 62 * computing the control box. However, it uses an advanced algorithm 63 * that returns _very_ quickly when the two boxes coincide. Otherwise, 64 * the outline Bezier arcs are traversed to extract their extrema. 65 * 66 * @input: 67 * outline :: 68 * A pointer to the source outline. 69 * 70 * @output: 71 * abbox :: 72 * The outline's exact bounding box. 73 * 74 * @return: 75 * FreeType error code. 0~means success. 76 * 77 * @note: 78 * If the font is tricky and the glyph has been loaded with 79 * @FT_LOAD_NO_SCALE, the resulting BBox is meaningless. To get 80 * reasonable values for the BBox it is necessary to load the glyph at a 81 * large ppem value (so that the hinting instructions can properly shift 82 * and scale the subglyphs), then extracting the BBox, which can be 83 * eventually converted back to font units. 84 */ 85 FT_EXPORT( FT_Error ) 86 FT_Outline_Get_BBox( FT_Outline* outline, 87 FT_BBox *abbox ); 88 89 /* */ 90 91 92 FT_END_HEADER 93 94 #endif /* FTBBOX_H_ */ 95 96 97 /* END */ 98 99 100 /* Local Variables: */ 101 /* coding: utf-8 */ 102 /* End: */