1 /***************************************************************************/ 2 /* */ 3 /* ftbbox.h */ 4 /* */ 5 /* FreeType exact bbox computation (specification). */ 6 /* */ 7 /* Copyright 1996-2015 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 Bzier arcs are traversed to */ 65 /* extract their extrema. */ 66 /* */ 67 /* <Input> */ 68 /* outline :: A pointer to the source outline. */ 69 /* */ 70 /* <Output> */ 71 /* abbox :: 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 */ 80 /* at a large ppem value (so that the hinting instructions can */ 81 /* properly shift and scale the subglyphs), then extracting the BBox, */ 82 /* which can be 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
