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Provide more macros for flooring, ceiling, and rounding. 

These versions don't produce run-time errors due to integer
overflow.

* include/freetype/internal/ftobjs.h: Include FT_INTERNAL_CALC_H.
(FT_PAD_ROUND_LONG, FT_PAD_CEIL_LONG, FT_PIX_ROUND_LONG,
FT_PIX_CEIL_LONG): New macros.
(FT_PAD_ROUND_INT32, FT_PAD_CEIL_INT32, FT_PIX_ROUND_INT32,
FT_PIX_CEIL_INT32): New macros.
This commit is contained in:
Werner Lemberg 2017-06-09 20:34:28 +02:00
parent faf34d29e2
commit 96d26926d1
2 changed files with 32 additions and 2 deletions
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13
ChangeLog
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@ -1,3 +1,16 @@
2017-06-09 Werner Lemberg <wl@gnu.org>
Provide more macros for flooring, ceiling, and rounding.
These versions don't produce run-time errors due to integer
overflow.
* include/freetype/internal/ftobjs.h: Include FT_INTERNAL_CALC_H.
(FT_PAD_ROUND_LONG, FT_PAD_CEIL_LONG, FT_PIX_ROUND_LONG,
FT_PIX_CEIL_LONG): New macros.
(FT_PAD_ROUND_INT32, FT_PAD_CEIL_INT32, FT_PIX_ROUND_INT32,
FT_PIX_CEIL_INT32): New macros.
2017-06-09 Werner Lemberg <wl@gnu.org>
Remove unused macros.

21
include/freetype/internal/ftobjs.h
View File

@ -36,6 +36,7 @@
#include FT_INTERNAL_AUTOHINT_H
#include FT_INTERNAL_SERVICE_H
#include FT_INTERNAL_PIC_H
#include FT_INTERNAL_CALC_H
#ifdef FT_CONFIG_OPTION_INCREMENTAL
#include FT_INCREMENTAL_H
@ -85,13 +86,29 @@ FT_BEGIN_HEADER
/* we use FT_TYPEOF to suppress signedness compilation warnings */
#define FT_PAD_FLOOR( x, n ) ( (x) & ~FT_TYPEOF( x )( (n)-1 ) )
#define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + ((n)/2), n )
#define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + ((n)-1), n )
#define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + (n)/2, n )
#define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + (n)-1, n )
#define FT_PIX_FLOOR( x ) ( (x) & ~FT_TYPEOF( x )63 )
#define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
#define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
/* specialized versions (for signed values) */
/* that don't produce run-time errors due to integer overflow */
#define FT_PAD_ROUND_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) / 2 ), \
n )
#define FT_PAD_CEIL_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) - 1 ), \
n )
#define FT_PIX_ROUND_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 32 ) )
#define FT_PIX_CEIL_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 63 ) )
#define FT_PAD_ROUND_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) / 2 ), \
n )
#define FT_PAD_CEIL_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) - 1 ), \
n )
#define FT_PIX_ROUND_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 32 ) )
#define FT_PIX_CEIL_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 63 ) )
/*
* character classification functions -- since these are used to parse