ASTC Interpolation

A method of using a binary logic circuit to interpolate between two endpoint values E0 and E1 for generating an interpolated result P, the values E0 and E1 being formed from low-dynamic range (LDR) colour endpoint values C0 and C1 respectively, the method comprising:

• performing an interpolation between the colour endpoint values C0 and C1 to generate a first intermediate interpolated result C2;
• determining the interpolated result P such that the interpolated result P satisfies the equation P=└((C2<<8)+C2+32)/64┘, or satisfies the equation P=└((C2<<8)+128·64+32)/64┘.

A non-transitory computer readable storage medium having stored thereon a computer readable dataset description of a binary logic circuit for performing an interpolation calculation between two endpoint values E0 and E1 for generating an interpolated result P, the values E0 and E1 being formed from low-dynamic range (LDR) colour endpoint values C0 and C1 respectively, the binary logic circuit being configured to:

• perform an interpolation between the colour endpoint values C0 and C1 to generate a first intermediate interpolated result C2;
• and
• determine the interpolated result P such that the interpolated result P satisfies the equation P=└((C2<<8)+C2+32)/64┘, or satisfies the equation P=└((C2<<8)+128·64+32)/64┘.