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/* Fixed-point arithmetic, no tables.
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#define BILINEAR_INT( TYPE ) { \
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const int X = (x - ix) * VIPS_INTERPOLATE_SCALE; \
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const int Y = (iy - y) * VIPS_INTERPOLATE_SCALE; \
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for( z = 0; z < b; z++ ) { \
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const int top = tp1[z] + \