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Use bit tricks for HB_DIRECTION_IS_* 

We already depend on the exact values of the direction enum
in HB_DIRECTION_REVERSE(), so we may as well use that.
This commit is contained in:
Behdad Esfahbod 2010-05-12 18:29:25 -04:00
parent 22da7fd94d
commit 1ce4dc95db
1 changed files with 4 additions and 4 deletions
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8
src/hb-common.h
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@ -79,10 +79,10 @@ typedef enum _hb_direction_t {
HB_DIRECTION_BTT HB_DIRECTION_BTT
} hb_direction_t; } hb_direction_t;
#define HB_DIRECTION_IS_HORIZONTAL(dir) ((dir) == HB_DIRECTION_LTR || (dir) == HB_DIRECTION_RTL) #define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 0)
#define HB_DIRECTION_IS_VERTICAL(dir) ((dir) == HB_DIRECTION_TTB || (dir) == HB_DIRECTION_BTT) #define HB_DIRECTION_IS_VERTICAL(dir) ((((unsigned int) (dir)) & ~1U) == 2)
#define HB_DIRECTION_IS_FORWARD(dir) ((dir) == HB_DIRECTION_LTR || (dir) == HB_DIRECTION_TTB) #define HB_DIRECTION_IS_FORWARD(dir) ((((unsigned int) (dir)) & ~2U) == 0)
#define HB_DIRECTION_IS_BACKWARD(dir) ((dir) == HB_DIRECTION_RTL || (dir) == HB_DIRECTION_BTT) #define HB_DIRECTION_IS_BACKWARD(dir) ((((unsigned int) (dir)) & ~2U) == 1)
#define HB_DIRECTION_REVERSE(dir) ((hb_direction_t) (((unsigned int) (dir)) ^ 1)) #define HB_DIRECTION_REVERSE(dir) ((hb_direction_t) (((unsigned int) (dir)) ^ 1))