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/***************************************************************************/ /* */ /* ftsizes.h */ /* */ /* FreeType size objects management (specification). */ /* */ /* Copyright 1996-2018 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ /*************************************************************************/ /* */ /* Typical application would normally not need to use these functions. */ /* However, they have been placed in a public API for the rare cases */ /* where they are needed. */ /* */ /*************************************************************************/ #ifndef FTSIZES_H_ #define FTSIZES_H_ #include <ft2build.h> #include FT_FREETYPE_H #ifdef FREETYPE_H #error "freetype.h of FreeType 1 has been loaded!" #error "Please fix the directory search order for header files" #error "so that freetype.h of FreeType 2 is found first." #endif FT_BEGIN_HEADER /*************************************************************************/ /* */ /* <Section> */ /* sizes_management */ /* */ /* <Title> */ /* Size Management */ /* */ /* <Abstract> */ /* Managing multiple sizes per face. */ /* */ /* <Description> */ /* When creating a new face object (e.g., with @FT_New_Face), an */ /* @FT_Size object is automatically created and used to store all */ /* pixel-size dependent information, available in the `face->size' */ /* field. */ /* */ /* It is however possible to create more sizes for a given face, */ /* mostly in order to manage several character pixel sizes of the */ /* same font family and style. See @FT_New_Size and @FT_Done_Size. */ /* */ /* Note that @FT_Set_Pixel_Sizes and @FT_Set_Char_Size only */ /* modify the contents of the current `active' size; you thus need */ /* to use @FT_Activate_Size to change it. */ /* */ /* 99% of applications won't need the functions provided here, */ /* especially if they use the caching sub-system, so be cautious */ /* when using these. */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* FT_New_Size */ /* */ /* <Description> */ /* Create a new size object from a given face object. */ /* */ /* <Input> */ /* face :: A handle to a parent face object. */ /* */ /* <Output> */ /* asize :: A handle to a new size object. */ /* */ /* <Return> */ /* FreeType error code. 0~means success. */ /* */ /* <Note> */ /* You need to call @FT_Activate_Size in order to select the new size */ /* for upcoming calls to @FT_Set_Pixel_Sizes, @FT_Set_Char_Size, */ /* @FT_Load_Glyph, @FT_Load_Char, etc. */ /* */ FT_EXPORT( FT_Error ) FT_New_Size( FT_Face face, FT_Size* size ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_Size */ /* */ /* <Description> */ /* Discard a given size object. Note that @FT_Done_Face */ /* automatically discards all size objects allocated with */ /* @FT_New_Size. */ /* */ /* <Input> */ /* size :: A handle to a target size object. */ /* */ /* <Return> */ /* FreeType error code. 0~means success. */ /* */ FT_EXPORT( FT_Error ) FT_Done_Size( FT_Size size ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Activate_Size */ /* */ /* <Description> */ /* Even though it is possible to create several size objects for a */ /* given face (see @FT_New_Size for details), functions like */ /* @FT_Load_Glyph or @FT_Load_Char only use the one that has been */ /* activated last to determine the `current character pixel size'. */ /* */ /* This function can be used to `activate' a previously created size */ /* object. */ /* */ /* <Input> */ /* size :: A handle to a target size object. */ /* */ /* <Return> */ /* FreeType error code. 0~means success. */ /* */ /* <Note> */ /* If `face' is the size's parent face object, this function changes */ /* the value of `face->size' to the input size handle. */ /* */ FT_EXPORT( FT_Error ) FT_Activate_Size( FT_Size size ); /* */ FT_END_HEADER #endif /* FTSIZES_H_ */ /* END */