Catch Pixelmatch error for mismatched images sizes #59
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Add try/catch to handle image size mismatch errors Update error message to reflect mismatch error & not log non-existent diff path
revert formatting
index.js
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| if(e.message !== IMAGE_SIZE_ERROR) console.error(e) | ||
| reject({ | ||
| errorPixelCount, | ||
| errorPixelCount: Math.abs((baseImg.data.length - tmpImg.data.length) / 4), |
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Is this correct? 🤔 Can you explain this?
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ah I see, this is virtual here basically.. Can you rewrite this to make this clearer to something like this:
} catch (e) {
if(e.message === IMAGE_SIZE_ERROR) {
return reject(...);
}
reject(e);
}Currently this would swallow other errors, I think?
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image.data.length is the number of pixels x 4 (for RGBA channels); within the version of Pixelmatch this is using, it verifies that the image data is exactly width x height x 4.
Taking the absolute value will return a positive count of differing pixels, regardless of which image is smaller.
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The change around rejection is sound, and I think the error should be logged so the user can see what unexpected behaviour is there
| data.fullDiffPath = diffPath? path.join(__dirname, diffPath) : null; | ||
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| if(reason.diffPath === null){ | ||
| data.error = `Image sizes do not match ${errorPixelCount} pixels differ - img: ${tmpPath}`; |
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| data.error = `Image sizes do not match ${errorPixelCount} pixels differ - img: ${tmpPath}`; | |
| data.error = `Image sizes do not match - ${errorPixelCount} pixels differ - img: ${tmpPath}`; |
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This is just copying the formatting of the existing error message
2 participants
Throw error on size match error & reflect same in error message