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sw_engine: data optimization.

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changed alpha channel data type to 32 bits from 8 bits,
since subsequent data operations requires 32 bits values.

this 8 bits (since channel range is up to 255) doesn't helpful
for saving memory size because it would generate additional data casting by compiler.

I compared the binary size and this patch saves about 600bytes.
This commit is contained in:
Hermet Park 2021-06-02 21:15:58 +09:00
parent 6ccebb3234
commit a8a120942e
1 changed files with 1 additions and 1 deletions
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2
src/lib/sw_engine/tvgSwCommon.h
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@ -279,7 +279,7 @@ static inline uint32_t COLOR_INTERPOLATE(uint32_t c1, uint32_t a1, uint32_t c2,
return (c1 |= t); return (c1 |= t);
} }
static inline uint8_t ALPHA_MULTIPLY(uint32_t c, uint32_t a) static inline uint32_t ALPHA_MULTIPLY(uint32_t c, uint32_t a)
{ {
return ((c * a + 0xff) >> 8); return ((c * a + 0xff) >> 8);
} }