splat()

Tile2x2_u8 fl::splat

(

vec2f

xy

)

"Splat" as in "splat pixel rendering" takes a pixel value in float x,y coordinates and "splats" it into a 2x2 tile of pixel values.

Each of the four pixels in the tile is a uint8_t value in the range [0..255] that represents the intensity of the pixel at that point. Tile2x2_u8 splat(vec2f xy);

Definition at line 14 of file splat.cpp.

                           {
    // 1) collect values.
    float x = xy.x;
    float y = xy.y;
 
    // 2) integer cell indices
    int16_t cx = static_cast<int16_t>(floorf(x));
    int16_t cy = static_cast<int16_t>(floorf(y));
 
    // 3) fractional offsets in [0..1)
    float fx = x - cx;
    float fy = y - cy;
 
    // 4) bilinear weights
    float w_ll = (1 - fx) * (1 - fy); // lower‑left
    float w_lr = fx * (1 - fy);       // lower‑right
    float w_ul = (1 - fx) * fy;       // upper‑left
    float w_ur = fx * fy;             // upper‑right
 
    // 5) build Tile2x2_u8 anchored at (cx,cy)
    Tile2x2_u8 out(vec2<int16_t>(cx, cy));
    out.lower_left() = to_uint8(w_ll);
    out.lower_right() = to_uint8(w_lr);
    out.upper_left() = to_uint8(w_ul);
    out.upper_right() = to_uint8(w_ur);
 
    return out;
}

References fl::Tile2x2_u8::lower_left(), fl::Tile2x2_u8::lower_right(), to_uint8(), fl::Tile2x2_u8::upper_left(), fl::Tile2x2_u8::upper_right(), x, xy(), and y.

Referenced by fl::Corkscrew::at_splat(), and fl::XYPathRenderer::at_subpixel().

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