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95 lines
2.0 KiB
95 lines
2.0 KiB
2 months ago
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#ifndef _IMAGES_MATH_H
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#define _IMAGES_MATH_H
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#ifdef CONFIG_UCW_CLEAN_ABI
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#define fast_div_tab ucw_fast_div_tab
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#define fast_sqrt_tab ucw_fast_sqrt_tab
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#endif
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extern const u32 fast_div_tab[];
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extern const byte fast_sqrt_tab[];
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static inline uint isqr(int x)
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{
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return x * x;
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}
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static inline uint fast_div_u32_u8(uint x, uint y)
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{
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return ((u64)(x) * fast_div_tab[y]) >> 32;
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}
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static inline uint fast_sqrt_u16(uint x)
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{
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uint y;
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if (x < (1 << 10) - 3)
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y = fast_sqrt_tab[(x + 3) >> 2] >> 3;
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else if (x < (1 << 14) - 28)
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y = fast_sqrt_tab[(x + 28) >> 6] >> 1;
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else
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y = fast_sqrt_tab[x >> 8];
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return (x < y * y) ? y - 1 : y;
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}
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static inline uint fast_sqrt_u32(uint x)
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{
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uint y;
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if (x < (1 << 16))
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{
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if (x < (1 << 10) - 3)
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y = fast_sqrt_tab[(x + 3) >> 2] >> 3;
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else if (x < (1 << 14) - 28)
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y = fast_sqrt_tab[(x + 28) >> 6] >> 1;
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else
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y = fast_sqrt_tab[x >> 8];
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}
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else
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{
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if (x < (1 << 24))
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{
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if (x < (1 << 20))
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{
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y = fast_sqrt_tab[x >> 12];
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y = (fast_div_u32_u8(x, y) >> 3) + (y << 1);
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}
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else
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{
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y = fast_sqrt_tab[x >> 16];
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y = (fast_div_u32_u8(x, y) >> 5) + (y << 3);
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}
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}
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else
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{
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if (x < (1 << 28))
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{
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if (x < (1 << 26))
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{
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y = fast_sqrt_tab[x >> 18];
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y = (fast_div_u32_u8(x, y) >> 6) + (y << 4);
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}
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else
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{
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y = fast_sqrt_tab[x >> 20];
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y = (fast_div_u32_u8(x, y) >> 7) + (y << 5);
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}
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}
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else
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{
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if (x < (1 << 30))
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{
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y = fast_sqrt_tab[x >> 22];
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y = (fast_div_u32_u8(x, y) >> 8) + (y << 6);
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}
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else
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{
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y = fast_sqrt_tab[x >> 24];
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y = (fast_div_u32_u8(x, y) >> 9) + (y << 7);
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}
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}
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}
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}
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return (x < y * y) ? y - 1 : y;
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}
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#endif
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