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optimization from DCN

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This commit is contained in:
dborth 2010-02-12 07:38:42 +00:00
parent f864d0d4a5
commit 0b0ee1698c
1 changed files with 8 additions and 3 deletions
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11
source/ngc/Metaphrasis.cpp
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@ -274,9 +274,14 @@ uint32_t* Metaphrasis::convertBufferToRGBA8(uint32_t* rgbaBuffer, uint16_t buffe
*/
uint16_t Metaphrasis::convertRGBAToRGB565(uint32_t rgba) {
uint8_t r = (((rgba >> 24) & 0xff) * 31) / 255;
uint8_t g = (((rgba >> 16) & 0xff) * 63) / 255;
uint8_t b = (((rgba >> 8) & 0xff) * 31) / 255;
uint32_t rA = ((rgba >> 24) & 0xff);
uint32_t gA = ((rgba >> 16) & 0xff);
uint32_t bA = ((rgba >> 8) & 0xff);
uint32_t r = ((rA<<5) - rA) / 255;
uint32_t g = ((gA<<6) - gA) / 255;
uint32_t b = ((bA<<5) - bA) / 255;
return (((r << 6) | g ) << 5 ) | b;
}