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28 lines
962 B
C
28 lines
962 B
C
#ifdef WORDS_BIGENDIAN
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#define MAKE_UINT32(u0, u1, u2, u3) (u3 | (u2<<8) | (u1<<16) | (u0<<24))
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#define MASK_UINT32_CHANNEL_0 0xff000000
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#define MASK_UINT32_CHANNEL_1 0x00ff0000
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#define MASK_UINT32_CHANNEL_2 0x0000ff00
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#define MASK_UINT32_CHANNEL_3 0x000000ff
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#else
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#define MAKE_UINT32(u0, u1, u2, u3) (u0 | (u1<<8) | (u2<<16) | (u3<<24))
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#define MASK_UINT32_CHANNEL_0 0x000000ff
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#define MASK_UINT32_CHANNEL_1 0x0000ff00
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#define MASK_UINT32_CHANNEL_2 0x00ff0000
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#define MASK_UINT32_CHANNEL_3 0xff000000
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#endif
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#define SHIFTFORDIV255(a)\
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((((a) >> 8) + a) >> 8)
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/* like (a * b + 127) / 255), but much faster on most platforms */
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#define MULDIV255(a, b, tmp)\
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(tmp = (a) * (b) + 128, SHIFTFORDIV255(tmp))
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#define BLEND(mask, in1, in2, tmp1, tmp2)\
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(MULDIV255(in1, 255 - mask, tmp1) + MULDIV255(in2, mask, tmp2))
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#define PREBLEND(mask, in1, in2, tmp1)\
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(MULDIV255(in1, (255 - mask), tmp1) + in2)
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