65 lines
2.3 KiB
Rust
65 lines
2.3 KiB
Rust
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//! Regression coverage for optimized Normal-blend adjustment compositing.
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//!
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//! **Purpose:** Verifies that bypassing the generic blend dispatcher preserves
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//! exact RGB output for opaque and partially opaque adjustments.
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//! **Logic & Workflow:** Builds a one-pixel base and Curves layer, composites
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//! through the public tiled path, and compares deterministic channel values.
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//! **Side Effects / Dependencies:** Allocates only one-pixel protocol layers.
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use hcie_blend::Adjustment;
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use hcie_composite::tiled::composite_tiled;
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use hcie_protocol::Layer;
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use hcie_tile::TiledLayer;
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/// Builds a Curves adjustment whose lookup tables map selected input channels.
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///
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/// **Arguments:** `opacity` controls the layer-level adjustment mix.
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/// **Returns:** A one-pixel adjustment layer. **Side Effects / Dependencies:** None.
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fn curves_layer(opacity: f32) -> Layer {
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let mut lut_r: Vec<u8> = (0..=255).map(|value| value as u8).collect();
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let mut lut_g = lut_r.clone();
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let mut lut_b = lut_r.clone();
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lut_r[10] = 100;
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lut_g[20] = 110;
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lut_b[30] = 120;
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let mut layer = Layer::new_transparent("Curves", 1, 1);
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layer.adjustment = Some(Adjustment::Curves {
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lut_r,
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lut_g,
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lut_b,
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});
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layer.opacity = opacity;
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layer
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}
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/// Confirms a fully opaque Normal adjustment assigns the LUT result exactly.
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#[test]
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fn opaque_normal_adjustment_matches_lookup_result() {
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let base = Layer::from_rgba("Base", 1, 1, vec![10, 20, 30, 255]);
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let adjustment = curves_layer(1.0);
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let tiles = vec![
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Some(TiledLayer::from_dense(&base.pixels, 1, 1)),
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Some(TiledLayer::from_dense(&adjustment.pixels, 1, 1)),
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];
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let output = composite_tiled(&[base, adjustment], &tiles, 1, 1);
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assert_eq!(output, vec![100, 110, 120, 255]);
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}
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/// Confirms partial opacity retains the previous rounded interpolation behavior.
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#[test]
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fn partial_normal_adjustment_preserves_rounded_interpolation() {
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let base = Layer::from_rgba("Base", 1, 1, vec![10, 20, 30, 255]);
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let adjustment = curves_layer(0.5);
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let tiles = vec![
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Some(TiledLayer::from_dense(&base.pixels, 1, 1)),
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Some(TiledLayer::from_dense(&adjustment.pixels, 1, 1)),
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];
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let output = composite_tiled(&[base, adjustment], &tiles, 1, 1);
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assert_eq!(output, vec![55, 65, 75, 255]);
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}
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