| 摘要 |
Luminance value data including data of R, G, and B and data alpha representing transparency, each of 8 bits, and a coefficient expressed by floating-point data are directly applied to an operation unit. The operation unit includes four 8x8 bit multiply unit for multiplying 8-bit data of each component forming the luminance value data by the most significant 8 bits of data of the mantissa of the coefficient. An output of each of the multiply units is shifted by corresponding shifters, whereby data of 8 bits is output for each component. Luminance value data of a format identical to that provided is output from the operation unit. Thus, a multiplier is provided having the operation unit that can carry out luminance calculation at high speed.
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