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Bilinear interpolation: Difference between revisions
Updated D entry
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(Updated D entry) |
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Line 54:
<lang d>import grayscale_image;
/// Currently this accepts only a Grayscale image, for simplicity.
Image!Gray rescaleGray(in Image!Gray src, in float scaleX, in float scaleY)
pure nothrow @safe▼
▲pure nothrow
in {
assert(src !is null, "Input Image is null.");
assert(src.nx > 1 && src.ny > 1, "Minimal input image size is 2x2.");
assert(cast(uint)(src.nx * scaleX) > 0, "Output image
assert(cast(uint)(src.
} body {
alias FP = float;
static FP lerp(in FP s, in FP e, in FP t) pure nothrow @safe @nogc {
return s + (e - s) * t;
}
static FP blerp(in FP c00, in FP c10, in FP c01, in FP c11,
in FP tx, in FP ty) pure nothrow @safe @nogc {
return lerp(lerp(c00, c10, tx), lerp(c01, c11, tx), ty);
}
Line 88 ⟶ 84:
immutable gyi = cast(uint)gy;
immutable c00 = src[gxi, gyi ];
immutable c10 = src[gxi + 1, gyi ];
immutable c01 = src[gxi, gyi + 1];
immutable c11 = src[gxi + 1, gyi + 1];
immutable pixel = blerp(c00, c10, c01, c11, gx - gxi, gy - gyi);
result[x, y] = Gray(cast(ubyte)pixel);
}
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