| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>CSS Images Module Level 4: parsing gradients with color interpolation methods</title> |
| <link rel="author" title="Sam Weinig" href="mailto:weinig@apple.com"> |
| <link rel="help" href="https://drafts.csswg.org/css-images-4/#gradients"> |
| <link rel="help" href="https://drafts.csswg.org/css-color-4/#color-interpolation-method"> |
| <meta name="assert" content="gradients supports the addition of color-interpolation-method to the grammar"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/support/computed-testcommon.js"></script> |
| </head> |
| <body> |
| <div id="target"></div> |
| <div id="computedStyleTarget"></div> |
| <script> |
| |
| const LINEAR_GRADIENT_SPECIFIERS = [ |
| { input: '30deg' }, |
| { input: 'to right bottom' }, |
| ]; |
| |
| const RADIAL_GRADIENT_SPECIFIERS = [ |
| { input: '50px' }, |
| { input: 'ellipse 50% 40em', output: '50% 640px' }, |
| { input: 'at right center', output: 'at 100% 50%' }, |
| ]; |
| |
| const CONIC_GRADIENT_SPECIFIERS = [ |
| { input: 'from 30deg' }, |
| { input: 'at left 10px top 50em', output: 'at 10px 800px' }, |
| ]; |
| |
| const legacy_stops = "red, blue" |
| const non_legacy_stops = "color(srgb 1 0 0), blue" |
| |
| // getComputedStyle can return different values than input |
| function get_computed_style_value_for_stops(stops) { |
| const div = document.getElementById("computedStyleTarget"); |
| computedColors = []; |
| stops.split(",").forEach(stop => { |
| div.style["color"] = stop; |
| computedColors.push(getComputedStyle(div)["color"]); |
| }); |
| return computedColors.join(", "); |
| } |
| const legacy_stops_computed_style = get_computed_style_value_for_stops(legacy_stops); |
| const non_legacy_stops_computed_style = get_computed_style_value_for_stops(non_legacy_stops); |
| |
| function test_gradients_no_specified_interpolation_method(gradientFunction, specifiers, stops, computed_stops) |
| { |
| for (const specifier of specifiers) { |
| const input = specifier.input |
| const output = specifier.output ? specifier.output : specifier.input |
| test_computed_value(`background-image`, `${gradientFunction}(${input}, ${stops})`, `${gradientFunction}(${output}, ${computed_stops})`) |
| } |
| } |
| |
| function test_gradients(gradientFunction, colorInterpolationMethod, colorInterpolationMethodResult, specifiers, stops, computed_stops) { |
| const resultForNoSpecifierCase = (colorInterpolationMethodResult == "") ? "" : `in ${colorInterpolationMethodResult}, ` |
| test_computed_value(`background-image`, `${gradientFunction}(in ${colorInterpolationMethod}, ${stops})`, `${gradientFunction}(${resultForNoSpecifierCase}${computed_stops})`) |
| |
| for (const specifier of specifiers) { |
| const input = specifier.input |
| const output = specifier.output ? specifier.output : specifier.input |
| const result = colorInterpolationMethodResult == "" ? ", " : ` in ${colorInterpolationMethodResult}, ` |
| test_computed_value(`background-image`, `${gradientFunction}(${input} in ${colorInterpolationMethod}, ${stops})`, `${gradientFunction}(${output}${result}${computed_stops})`) |
| test_computed_value(`background-image`, `${gradientFunction}(in ${colorInterpolationMethod} ${input}, ${stops})`, `${gradientFunction}(${output}${result}${computed_stops})`) |
| } |
| } |
| |
| function test_gradient_with_interpolation_method(gradientFunction, colorInterpolationMethod, colorInterpolationMethodResult, specifiers, stops, computed_stops) { |
| const colorInterpolationMethodResultForLegacyStops = (colorInterpolationMethodResult == "srgb") ? "" : colorInterpolationMethodResult; |
| test_gradients(gradientFunction, colorInterpolationMethod, colorInterpolationMethodResultForLegacyStops, specifiers, legacy_stops, legacy_stops_computed_style); |
| |
| const colorInterpolationMethodResultForNonLegacyStops = (colorInterpolationMethodResult == "oklab") ? "" : colorInterpolationMethodResult; |
| test_gradients(gradientFunction, colorInterpolationMethod, colorInterpolationMethodResultForNonLegacyStops, specifiers, non_legacy_stops, non_legacy_stops_computed_style); |
| } |
| |
| function test_each_interpolation_method(gradientFunction, specifiers) { |
| test_gradients_no_specified_interpolation_method(gradientFunction, specifiers, legacy_stops, legacy_stops_computed_style); |
| test_gradients_no_specified_interpolation_method(gradientFunction, specifiers, non_legacy_stops, non_legacy_stops_computed_style); |
| |
| for (const colorSpace of [ "lab", "oklab", "srgb", "srgb-linear", "xyz", "xyz-d50", "xyz-d65" ]) { |
| const colorInterpolationMethod = colorSpace |
| const colorInterpolationMethodResult = colorSpace == "xyz" ? "xyz-d65" : colorInterpolationMethod |
| |
| test_gradient_with_interpolation_method(gradientFunction, colorInterpolationMethod, colorInterpolationMethodResult, specifiers) |
| } |
| |
| for (const colorSpace of [ "hsl", "hwb", "lch", "oklch" ]) { |
| for (const hueInterpolationMethod of [ "", " shorter hue", " longer hue", " increasing hue", " decreasing hue" ]) { |
| const colorInterpolationMethod = `${colorSpace}${hueInterpolationMethod}` |
| const colorInterpolationMethodResult = hueInterpolationMethod == " shorter hue" ? colorSpace : colorInterpolationMethod |
| |
| test_gradient_with_interpolation_method(gradientFunction, colorInterpolationMethod, colorInterpolationMethodResult, specifiers) |
| } |
| } |
| } |
| |
| test_each_interpolation_method("linear-gradient", LINEAR_GRADIENT_SPECIFIERS) |
| test_each_interpolation_method("radial-gradient", RADIAL_GRADIENT_SPECIFIERS) |
| test_each_interpolation_method("conic-gradient", CONIC_GRADIENT_SPECIFIERS) |
| |
| </script> |
| </body> |
| </html> |
