| 274 | } |
| 275 | |
| 276 | void ScaleYCoCg( uint8_t* colorBlock, uint8_t* minColor, uint8_t* maxColor ) |
| 277 | { |
| 278 | int m0 = abs( minColor[0] - 128 ); |
| 279 | int m1 = abs( minColor[1] - 128 ); |
| 280 | int m2 = abs( maxColor[0] - 128 ); |
| 281 | int m3 = abs( maxColor[1] - 128 ); |
| 282 | |
| 283 | if( m1 > m0 ) |
| 284 | m0 = m1; |
| 285 | if( m3 > m2 ) |
| 286 | m2 = m3; |
| 287 | if( m2 > m0 ) |
| 288 | m0 = m2; |
| 289 | |
| 290 | const int s0 = 128 / 2 - 1; |
| 291 | const int s1 = 128 / 4 - 1; |
| 292 | |
| 293 | int mask0 = -( m0 <= s0 ); |
| 294 | int mask1 = -( m0 <= s1 ); |
| 295 | int scale = 1 + ( 1 & mask0 ) + ( 2 & mask1 ); |
| 296 | |
| 297 | minColor[0] = ( minColor[0] - 128 ) * scale + 128; |
| 298 | minColor[1] = ( minColor[1] - 128 ) * scale + 128; |
| 299 | minColor[2] = ( scale - 1 ) << 3; |
| 300 | |
| 301 | maxColor[0] = ( maxColor[0] - 128 ) * scale + 128; |
| 302 | maxColor[1] = ( maxColor[1] - 128 ) * scale + 128; |
| 303 | maxColor[2] = ( scale - 1 ) << 3; |
| 304 | |
| 305 | for( int i = 0; i < 16; i++ ) |
| 306 | { |
| 307 | colorBlock[i * 4 + 0] = ( colorBlock[i * 4 + 0] - 128 ) * scale + 128; |
| 308 | colorBlock[i * 4 + 1] = ( colorBlock[i * 4 + 1] - 128 ) * scale + 128; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | void InsetYCoCgBBox( uint8_t* minColor, uint8_t* maxColor ) |
| 313 | { |