2020-08-16 13:39:22 +02:00
|
|
|
|
[sdf] Add common elements for 'sdf' and 'bsdf' renderers.
* src/sdf/ftsdfrend.h (SDF_Rendere_Module, ft_sdf_renderer_class,
ft_bitmap_sdf_renderer_class): New structures.
* src/sdf/ftsdfcommon.h (DEFAULT_SPREAD, MIN_SPREAD_MAX_SPREAD,
USE_SQUARED_DISTANCES): New macros.
(FT_INT_26D6, FT_INT_16D16, FT_26D6_16D16): New macros.
(FT_CALL, VECTOR_LENGTH_16D16): New macros.
(FT_26D6_Vec, FT_16D16_Vec, FT_16D16, FT_26D6, FT_6D10, FT_CBox):
New typedefs.
(square_root): New macro.
* src/sdf/ftsdferrs.h: Add module error setup.
2020-08-17 08:10:57 +02:00
|
|
|
/****************************************************
|
|
|
|
*
|
|
|
|
* This file contains common functions and properties
|
|
|
|
* for both the 'sdf' and 'bsdf' renderers.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
2020-08-16 13:39:22 +02:00
|
|
|
#ifndef FTSDFCOMMON_H_
|
|
|
|
#define FTSDFCOMMON_H_
|
|
|
|
|
[sdf] Add common elements for 'sdf' and 'bsdf' renderers.
* src/sdf/ftsdfrend.h (SDF_Rendere_Module, ft_sdf_renderer_class,
ft_bitmap_sdf_renderer_class): New structures.
* src/sdf/ftsdfcommon.h (DEFAULT_SPREAD, MIN_SPREAD_MAX_SPREAD,
USE_SQUARED_DISTANCES): New macros.
(FT_INT_26D6, FT_INT_16D16, FT_26D6_16D16): New macros.
(FT_CALL, VECTOR_LENGTH_16D16): New macros.
(FT_26D6_Vec, FT_16D16_Vec, FT_16D16, FT_26D6, FT_6D10, FT_CBox):
New typedefs.
(square_root): New macro.
* src/sdf/ftsdferrs.h: Add module error setup.
2020-08-17 08:10:57 +02:00
|
|
|
#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 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 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 )
|
|
|
|
|
|
|
|
|
|
|
|
/* Convenience macro to call a function; it */
|
|
|
|
/* jumps to label `Exit` if an error occurs. */
|
|
|
|
#define FT_CALL( x ) do \
|
|
|
|
{ \
|
|
|
|
error = ( x ); \
|
|
|
|
if ( error != FT_Err_Ok ) \
|
|
|
|
goto Exit; \
|
|
|
|
} while ( 0 )
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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( v ) ( FT_MulFix( v.x, v.x ) + \
|
|
|
|
FT_MulFix( v.y, v.y ) )
|
|
|
|
#else
|
|
|
|
#define VECTOR_LENGTH_16D16( v ) FT_Vector_Length( &v )
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
/**************************************************************************
|
|
|
|
*
|
|
|
|
* 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
|
|
|
|
*
|
|
|
|
* Use this to compute the square root of a 16.16 fixed point number.
|
|
|
|
*/
|
|
|
|
static FT_16D16
|
|
|
|
square_root( FT_16D16 val )
|
|
|
|
{
|
|
|
|
FT_ULong t, q, b, r;
|
|
|
|
|
|
|
|
|
|
|
|
r = val;
|
|
|
|
b = 0x40000000L;
|
|
|
|
q = 0;
|
|
|
|
|
|
|
|
while ( b > 0x40L )
|
|
|
|
{
|
|
|
|
t = q + b;
|
|
|
|
|
|
|
|
if ( r >= t )
|
|
|
|
{
|
|
|
|
r -= t;
|
|
|
|
q = t + b;
|
|
|
|
}
|
|
|
|
|
|
|
|
r <<= 1;
|
|
|
|
b >>= 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
q >>= 8;
|
|
|
|
|
|
|
|
return q;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
FT_END_HEADER
|
2020-08-16 13:39:22 +02:00
|
|
|
|
|
|
|
#endif /* FTSDFCOMMON_H_ */
|
|
|
|
|
|
|
|
/* END */
|