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fixed possible divide by zero in pencil sketch

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git-svn-id: svn://code.dyne.org/veejay/trunk@617 eb8d1916-c9e9-0310-b8de-cf0c9472ead5
This commit is contained in:
Niels Elburg
2006-10-05 17:46:13 +00:00
parent 555607e2f6
commit 3d20bcc55b
1 changed files with 5 additions and 3 deletions
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8
veejay-current/libvje/effects/pencilsketch.c
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@@ -63,9 +63,7 @@ typedef uint8_t (*_pcbcr) (uint8_t a, uint8_t b);
static uint8_t _pcf_lghtn(uint8_t a, uint8_t b, int t_max) static uint8_t _pcf_lghtn(uint8_t a, uint8_t b, int t_max)
{ {
uint8_t p = (a > b ? a : b ); return (a > b ? a : b );
// if( p >= 16 || p <= t_max) p = 16 ; else p = 240;
return p;
} }
static uint8_t _pcf_dneg2(uint8_t a,uint8_t b, int t_max) static uint8_t _pcf_dneg2(uint8_t a,uint8_t b, int t_max)
@@ -86,6 +84,8 @@ typedef uint8_t (*_pcbcr) (uint8_t a, uint8_t b);
static uint8_t _pcf_max(uint8_t a,uint8_t b, int t_max) static uint8_t _pcf_max(uint8_t a,uint8_t b, int t_max)
{ {
int p = ( (b > a) ? b : a); int p = ( (b > a) ? b : a);
if( p <= 0 )
return 0;
p = ( 255 - ((255 - b) * (255 - b)) / p); p = ( 255 - ((255 - b) * (255 - b)) / p);
// if( p >= 16 || p <= t_max) p = 16 ; else p = 240; // if( p >= 16 || p <= t_max) p = 16 ; else p = 240;
return (uint8_t)p; return (uint8_t)p;
@@ -93,6 +93,8 @@ typedef uint8_t (*_pcbcr) (uint8_t a, uint8_t b);
static uint8_t _pcf_pq(uint8_t a,uint8_t b, int t_max) static uint8_t _pcf_pq(uint8_t a,uint8_t b, int t_max)
{ {
if(a <= 0 ) a=16;
if(b <= 0 ) b=16;
int p = 255 - ((255-a) * (255-a)) / a; int p = 255 - ((255-a) * (255-a)) / a;
int q = 255 - ((255-b) * (255-b)) / b; int q = 255 - ((255-b) * (255-b)) / b;
p = ( 255 - ((255-p) * (255 - a)) / q); p = ( 255 - ((255-p) * (255 - a)) / q);