diff options
Diffstat (limited to 'graphics/scaler/intern.h')
| -rw-r--r-- | graphics/scaler/intern.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/graphics/scaler/intern.h b/graphics/scaler/intern.h index 4addd6d3bd..255cc1a511 100644 --- a/graphics/scaler/intern.h +++ b/graphics/scaler/intern.h @@ -18,9 +18,6 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * - * $URL$ - * $Id$ - * */ #ifndef GRAPHICS_SCALER_INTERN_H @@ -77,6 +74,16 @@ static inline unsigned interpolate16_3_1(unsigned p1, unsigned p2) { } /** + * Interpolate two 16 bit pixels with weights 5 and 3 and 1, i.e., (5*p1+3*p2)/8. + */ +template<typename ColorMask> +static inline unsigned interpolate16_5_3(unsigned p1, unsigned p2) { + const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + (p1 & ColorMask::kLow3Bits) + + ((p2 & ColorMask::kLow2Bits) << 1) + (p2 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits; + return ((p1*5 + p2*3) - lowbits) >> 3; +} + +/** * Interpolate two 16 bit pixels with weights 7 and 1, i.e., (7*p1+p2)/8. */ template<typename ColorMask> |