You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
2.0 KiB
95 lines
2.0 KiB
3 months ago
|
#ifndef _IMAGES_MATH_H
|
||
|
|
#define _IMAGES_MATH_H
|
||
|
|
|
||
|
|
#ifdef CONFIG_UCW_CLEAN_ABI
|
||
|
|
#define fast_div_tab ucw_fast_div_tab
|
||
|
|
#define fast_sqrt_tab ucw_fast_sqrt_tab
|
||
|
|
#endif
|
||
|
|
|
||
|
|
extern const u32 fast_div_tab[];
|
||
|
|
extern const byte fast_sqrt_tab[];
|
||
|
|
|
||
|
|
static inline uint isqr(int x)
|
||
|
|
{
|
||
|
|
return x * x;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline uint fast_div_u32_u8(uint x, uint y)
|
||
|
|
{
|
||
|
|
return ((u64)(x) * fast_div_tab[y]) >> 32;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline uint fast_sqrt_u16(uint x)
|
||
|
|
{
|
||
|
|
uint y;
|
||
|
|
if (x < (1 << 10) - 3)
|
||
|
|
y = fast_sqrt_tab[(x + 3) >> 2] >> 3;
|
||
|
|
else if (x < (1 << 14) - 28)
|
||
|
|
y = fast_sqrt_tab[(x + 28) >> 6] >> 1;
|
||
|
|
else
|
||
|
|
y = fast_sqrt_tab[x >> 8];
|
||
|
|
return (x < y * y) ? y - 1 : y;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline uint fast_sqrt_u32(uint x)
|
||
|
|
{
|
||
|
|
uint y;
|
||
|
|
if (x < (1 << 16))
|
||
|
|
{
|
||
|
|
if (x < (1 << 10) - 3)
|
||
|
|
y = fast_sqrt_tab[(x + 3) >> 2] >> 3;
|
||
|
|
else if (x < (1 << 14) - 28)
|
||
|
|
y = fast_sqrt_tab[(x + 28) >> 6] >> 1;
|
||
|
|
else
|
||
|
|
y = fast_sqrt_tab[x >> 8];
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (x < (1 << 24))
|
||
|
|
{
|
||
|
|
if (x < (1 << 20))
|
||
|
|
{
|
||
|
|
y = fast_sqrt_tab[x >> 12];
|
||
|
|
y = (fast_div_u32_u8(x, y) >> 3) + (y << 1);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
y = fast_sqrt_tab[x >> 16];
|
||
|
|
y = (fast_div_u32_u8(x, y) >> 5) + (y << 3);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (x < (1 << 28))
|
||
|
|
{
|
||
|
|
if (x < (1 << 26))
|
||
|
|
{
|
||
|
|
y = fast_sqrt_tab[x >> 18];
|
||
|
|
y = (fast_div_u32_u8(x, y) >> 6) + (y << 4);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
y = fast_sqrt_tab[x >> 20];
|
||
|
|
y = (fast_div_u32_u8(x, y) >> 7) + (y << 5);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (x < (1 << 30))
|
||
|
|
{
|
||
|
|
y = fast_sqrt_tab[x >> 22];
|
||
|
|
y = (fast_div_u32_u8(x, y) >> 8) + (y << 6);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
y = fast_sqrt_tab[x >> 24];
|
||
|
|
y = (fast_div_u32_u8(x, y) >> 9) + (y << 7);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return (x < y * y) ? y - 1 : y;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|