98 lines
3.4 KiB
Rust
98 lines
3.4 KiB
Rust
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#![allow(dead_code, unused_imports, unused_variables, unused_macros, unreachable_patterns, unused_assignments, clippy::cfg)]
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use hcie_blend::BlendMode;
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#[test]
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fn test_normal_zero_opacity_identity() {
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let dst = [128, 64, 32, 200];
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let src = [255, 0, 0, 255];
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let result = hcie_blend::blend_pixels(dst, src, BlendMode::Normal, 0.0);
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assert_eq!(result, dst, "opacity=0 should return dst unchanged");
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}
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#[test]
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fn test_normal_full_opacity() {
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let dst = [100, 100, 100, 255];
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let src = [200, 50, 80, 255];
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let result = hcie_blend::blend_pixels(dst, src, BlendMode::Normal, 1.0);
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assert_eq!(result, src, "Normal+opacity=1 should output src");
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}
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#[test]
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fn test_opacity_zero_no_mutation_for_all_modes() {
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let dst = [128, 64, 32, 255];
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let src = [255, 0, 0, 255];
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for mode in BlendMode::ALL {
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if *mode == BlendMode::PassThrough { continue; }
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let result = hcie_blend::blend_pixels(dst, src, *mode, 0.0);
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assert_eq!(result, dst, "opacity=0 should return dst unchanged for {:?}", mode);
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}
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}
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#[rstest::rstest]
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#[case(BlendMode::Multiply, [200, 100, 50, 255], [100, 100, 100, 255])]
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#[case(BlendMode::Screen, [200, 100, 50, 255], [100, 100, 100, 255])]
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#[case(BlendMode::Difference, [100, 200, 50, 255], [100, 150, 150, 255])]
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#[case(BlendMode::Darken, [100, 200, 50, 255], [100, 100, 150, 255])]
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#[case(BlendMode::Lighten, [100, 200, 50, 255], [150, 200, 150, 255])]
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fn test_specific_blend_modes(
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#[case] mode: BlendMode,
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#[case] src: [u8; 4],
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#[case] dst: [u8; 4],
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) {
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let result = hcie_blend::blend_pixels(dst, src, mode, 1.0);
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assert!(
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result[3] > 0 || (src[3] == 0 && dst[3] == 0),
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"Blend result should have valid alpha for {:?}, got {:?}",
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mode, result
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);
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}
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#[test]
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fn test_transparent_src_normal() {
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let dst = [128, 64, 32, 200];
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let src = [0, 0, 0, 0];
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let result = hcie_blend::blend_pixels(dst, src, BlendMode::Normal, 1.0);
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assert_eq!(result, dst, "fully transparent src should leave dst unchanged");
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}
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#[test]
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fn test_all_modes_produce_valid_alpha() {
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let dst = [100, 150, 200, 255];
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let src = [50, 100, 200, 128];
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for mode in BlendMode::ALL {
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if *mode == BlendMode::PassThrough { continue; }
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let _result = hcie_blend::blend_pixels(dst, src, *mode, 0.5);
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// u8 values are always valid (0-255)
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}
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}
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#[test]
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fn test_multiply_darkens() {
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let dst = [200, 200, 200, 255];
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let src = [100, 100, 100, 255];
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let result = hcie_blend::blend_pixels(dst, src, BlendMode::Multiply, 1.0);
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assert!(result[0] <= 100, "Multiply should darken red channel");
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}
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#[test]
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fn test_screen_lightens() {
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let dst = [100, 100, 100, 255];
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let src = [200, 200, 200, 255];
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let result = hcie_blend::blend_pixels(dst, src, BlendMode::Screen, 1.0);
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assert!(result[0] > 100, "Screen should lighten red channel");
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}
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proptest::proptest! {
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#[test]
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fn identity_at_zero_opacity(dr: u8, dg: u8, db: u8, da: u8,
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sr: u8, sg: u8, sb: u8, sa: u8) {
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let dst = [dr, dg, db, if da == 0 { 1 } else { da }];
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let src = [sr, sg, sb, if sa == 0 { 1 } else { sa }];
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for mode in BlendMode::ALL {
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if *mode == BlendMode::PassThrough { continue; }
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let result = hcie_blend::blend_pixels(dst, src, *mode, 0.0);
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proptest::prop_assert_eq!(result, dst, "opacity=0 identity failed for {:?}", mode);
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}
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}
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}
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