com.blockether.spel.visual-diff — com.blockether/spel 0.5.10

Pixel-level screenshot comparison using the pixelmatch algorithm. Runs inside Playwright's Canvas API — no AWT/ImageIO dependency, GraalVM native-image safe.

Based on pixelmatch by Mapbox (ISC license): https://github.com/mapbox/pixelmatch

compare-screenshot-files clj

(compare-screenshot-files baseline-path current-path & opts)

Compare two PNG screenshot files. See compare-screenshots for options.

compare-screenshots clj

(compare-screenshots baseline
                     current
                     &
                     {:keys [threshold include-aa alpha diff-path]
                      :or {threshold 0.1 include-aa false alpha 0.1}})

Compare two PNG screenshots pixel-by-pixel using the pixelmatch algorithm (YIQ NTSC color space with anti-aliasing detection).

Runs the comparison inside Playwright's Canvas API — no AWT/ImageIO, GraalVM native-image safe.

baseline and current are PNG byte arrays (as returned by page/screenshot).

Options: :threshold — matching threshold 0.0-1.0 (default 0.1, lower = stricter) :include-aa — count anti-aliased pixels as diff (default false) :alpha — opacity of original image in diff (default 0.1) :diff-path — optional path to save the diff image PNG

Returns: {:matched true/false :diff-count number of different pixels :total-pixels total pixel count :diff-percent percentage of different pixels (2 decimal places) :width comparison width :height comparison height :diff-image diff PNG as byte[] :baseline-dimensions {:width w :height h} :current-dimensions {:width w :height h} :dimension-mismatch true/false}