bilinearInterpolate()

u8 fl::bilinearInterpolate	(	u8	v00,
		u8	v10,
		u8	v01,
		u8	v11,
		u16	dx,
		u16	dy )

Definition at line 151 of file upscale.cpp.

                                            {
    u16 dx_inv = 256 - dx;
    u16 dy_inv = 256 - dy;
 
    u32 w00 = (u32)dx_inv * dy_inv;
    u32 w10 = (u32)dx * dy_inv;
    u32 w01 = (u32)dx_inv * dy;
    u32 w11 = (u32)dx * dy;
 
    u32 sum = v00 * w00 + v10 * w10 + v01 * w01 + v11 * w11;
 
    // Normalize the result by dividing by 65536 (shift right by 16 bits),
    // with rounding
    u8 result = (u8)((sum + 32768) >> 16);
 
    return result;
}

Referenced by upscaleArbitrary(), and upscaleRectangular().

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