/**************************************************************************** * * ftsdfcommon.h * * Auxiliary data for Signed Distance Field support (specification). * * Copyright (C) 2020-2023 by * David Turner, Robert Wilhelm, and Werner Lemberg. * * Written by Anuj Verma. * * 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. * */ /**************************************************** * * This file contains common functions and properties * for both the 'sdf' and 'bsdf' renderers. * */ #ifndef FTSDFCOMMON_H_ #define FTSDFCOMMON_H_ #include <ft2build.h> #include FT_CONFIG_CONFIG_H #include <freetype/internal/ftobjs.h> FT_BEGIN_HEADER /************************************************************************** * * default values (cannot be set individually for each renderer) * */ /* default spread value */ #define DEFAULT_SPREAD … /* minimum spread supported by the renderer */ #define MIN_SPREAD … /* maximum spread supported by the renderer */ #define MAX_SPREAD … /* pixel size in 26.6 */ #define ONE_PIXEL … /************************************************************************** * * common definitions (cannot be set individually for each renderer) * */ /* If this macro is set to 1 the rasterizer uses squared distances for */ /* computation. It can greatly improve the performance but there is a */ /* chance of overflow and artifacts. You can safely use it up to a */ /* pixel size of 128. */ #ifndef USE_SQUARED_DISTANCES #define USE_SQUARED_DISTANCES … #endif /************************************************************************** * * common macros * */ /* convert int to 26.6 fixed-point */ #define FT_INT_26D6( x ) … /* convert int to 16.16 fixed-point */ #define FT_INT_16D16( x ) … /* convert 26.6 to 16.16 fixed-point */ #define FT_26D6_16D16( x ) … /* Convenience macro to call a function; it */ /* jumps to label `Exit` if an error occurs. */ #define FT_CALL( x ) … /* * The macro `VECTOR_LENGTH_16D16` computes either squared distances or * actual distances, depending on the value of `USE_SQUARED_DISTANCES`. * * By using squared distances the performance can be greatly improved but * there is a risk of overflow. */ #if USE_SQUARED_DISTANCES #define VECTOR_LENGTH_16D16 … #else #define VECTOR_LENGTH_16D16( v ) … #endif /************************************************************************** * * common typedefs * */ FT_26D6_Vec; /* with 26.6 fixed-point components */ FT_16D16_Vec; /* with 16.16 fixed-point components */ FT_16D16; /* 16.16 fixed-point representation */ FT_26D6; /* 26.6 fixed-point representation */ FT_SDFFormat; /* format to represent SDF data */ FT_CBox; /* control box of a curve */ FT_LOCAL( FT_16D16 ) square_root( FT_16D16 val ); FT_LOCAL( FT_SDFFormat ) map_fixed_to_sdf( FT_16D16 dist, FT_16D16 max_value ); FT_LOCAL( FT_SDFFormat ) invert_sign( FT_SDFFormat dist ); FT_END_HEADER #endif /* FTSDFCOMMON_H_ */ /* END */
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