1 /**************************************************************************** 2 * 3 * ftbbox.h 4 * 5 * FreeType exact bbox computation (specification). 6 * 7 * Copyright (C) 1996-2020 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 <freetype/freetype.h> 35 36 #ifdef FREETYPE_H 37 #error "freetype.h of FreeType 1 has been loaded!" 38 #error "Please fix the directory search order for header files" 39 #error "so that freetype.h of FreeType 2 is found first." 40 #endif 41 42 43 FT_BEGIN_HEADER 44 45 46 /************************************************************************** 47 * 48 * @section: 49 * outline_processing 50 * 51 */ 52 53 54 /************************************************************************** 55 * 56 * @function: 57 * FT_Outline_Get_BBox 58 * 59 * @description: 60 * Compute the exact bounding box of an outline. This is slower than 61 * computing the control box. However, it uses an advanced algorithm 62 * that returns _very_ quickly when the two boxes coincide. Otherwise, 63 * the outline Bezier arcs are traversed to extract their extrema. 64 * 65 * @input: 66 * outline :: 67 * A pointer to the source outline. 68 * 69 * @output: 70 * abbox :: 71 * The outline's exact bounding box. 72 * 73 * @return: 74 * FreeType error code. 0~means success. 75 * 76 * @note: 77 * If the font is tricky and the glyph has been loaded with 78 * @FT_LOAD_NO_SCALE, the resulting BBox is meaningless. To get 79 * reasonable values for the BBox it is necessary to load the glyph at a 80 * large ppem value (so that the hinting instructions can properly shift 81 * and scale the subglyphs), then extracting the BBox, which can be 82 * eventually converted back to font units. 83 */ 84 FT_EXPORT( FT_Error ) 85 FT_Outline_Get_BBox( FT_Outline* outline, 86 FT_BBox *abbox ); 87 88 /* */ 89 90 91 FT_END_HEADER 92 93 #endif /* FTBBOX_H_ */ 94 95 96 /* END */ 97 98 99 /* Local Variables: */ 100 /* coding: utf-8 */ 101 /* End: */ 102