fn upscale_x(
src: &mut Pixmap,
src_width: u16,
src_height: u16,
edge_mode: EdgeMode,
)Expand description
Horizontal upsampling pass using [0.75, 0.25] interpolation with logical dimensions.
Doubles the logical width using phase-aligned interpolation. Each input pixel generates two output pixels with different weights based on their distance from the downsampled pixel’s center position. Operates in-place by processing backwards to avoid overwriting source data.