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/****************************************************
*
* This file contain common function and properties
* for both `sdf' and `bsdf' renderer.
*
*/
#ifndef FTSDFCOMMON_H_
#define FTSDFCOMMON_H_
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include <freetype/freetype.h>
FT_BEGIN_HEADER
/**************************************************************************
*
* default values (cannot be set individually for each renderer)
*
*/
/* default spread value */
#define DEFAULT_SPREAD 8
/* minimum spread supported by the renderer. */
#define MIN_SPREAD 2
/* maximum spread supported by the renderer. */
#define MAX_SPREAD 32
/**************************************************************************
*
* common definitions (cannot be set individually for each renderer)
*
*/
/* If it is defined to 1 then the rasterizer will use squared distances */
/* for computation. It can greatly improve the performance but there is */
/* a chance of overflow and artifacts. You can safely use it upto a */
/* pixel size of 128. */
#ifndef USE_SQUARED_DISTANCES
# define USE_SQUARED_DISTANCES 0
#endif
/**************************************************************************
*
* common macros
*
*/
/* convert int to 26.6 fixed point */
#define FT_INT_26D6( x ) ( x * 64 )
/* convert int to 16.16 fixed point */
#define FT_INT_16D16( x ) ( x * 65536 )
/* convert 26.6 to 16.16 fixed point */
#define FT_26D6_16D16( x ) ( x * 1024 )
/* Convenient macro which calls the function */
/* and returns if any error occurs. */
#define FT_CALL( x ) do \
{ \
error = ( x ); \
if ( error != FT_Err_Ok ) \
goto Exit; \
} while ( 0 )
/**************************************************************************
*
* common typedefs
*
*/
typedef FT_Vector FT_26D6_Vec; /* with 26.6 fixed point components */
typedef FT_Vector FT_16D16_Vec; /* with 16.16 fixed point components */
typedef FT_Fixed FT_16D16; /* 16.16 fixed point representation */
typedef FT_Fixed FT_26D6; /* 26.6 fixed point representation */
typedef FT_Short FT_6D10; /* 6.10 fixed point representation */
typedef FT_BBox FT_CBox; /* control box of a curve */
/**************************************************************************
*
* common functions
*
*/
/* Original Algorithm: https://github.com/chmike/fpsqrt */
static FT_16D16
square_root( FT_16D16 val )
{
FT_ULong t, q, b, r;
r = val;
b = 0x40000000;
q = 0;
while( b > 0x40 )
{
t = q + b;
if( r >= t )
{
r -= t;
q = t + b;
}
r <<= 1;
b >>= 1;
}
q >>= 8;
return q;
}
FT_END_HEADER
#endif /* FTSDFCOMMON_H_ */
/* END */
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