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Ensure trim op supports image-in-alpha #1597

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Lovell Fuller
2019-11-14 11:29:45 +00:00
parent 833aaead56
commit c41b87303d
7 changed files with 37 additions and 3 deletions
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test/fixtures/image-in-alpha.png vendored Normal file
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Width:  |  Height:  |  Size: 70 KiB

1
test/fixtures/index.js vendored
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@@ -87,6 +87,7 @@ module.exports = {
inputPngTruncated: getPath('truncated.png'), // gm convert 2569067123_aca715a2ee_o.jpg -resize 320x240 saw.png ; head -c 10000 saw.png > truncated.png
inputPngEmbed: getPath('embedgravitybird.png'), // Released to sharp under a CC BY 4.0
inputPngRGBWithAlpha: getPath('2569067123_aca715a2ee_o.png'), // http://www.flickr.com/photos/grizdave/2569067123/ (same as inputJpg)
inputPngImageInAlpha: getPath('image-in-alpha.png'), // https://github.com/lovell/sharp/issues/1597
inputWebP: getPath('4.webp'), // http://www.gstatic.com/webp/gallery/4.webp
inputWebPWithTransparency: getPath('5_webp_a.webp'), // http://www.gstatic.com/webp/gallery3/5_webp_a.webp

15
test/unit/trim.js
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@@ -41,6 +41,21 @@ describe('Trim borders', function () {
});
});
it('single colour PNG where alpha channel provides the image', () =>
sharp(fixtures.inputPngImageInAlpha)
.trim()
.toBuffer({ resolveWithObject: true })
.then(({ data, info }) => {
assert.strictEqual(true, data.length > 0);
assert.strictEqual('png', info.format);
assert.strictEqual(916, info.width);
assert.strictEqual(137, info.height);
assert.strictEqual(4, info.channels);
assert.strictEqual(-6, info.trimOffsetLeft);
assert.strictEqual(-20, info.trimOffsetTop);
})
);
it('16-bit PNG with alpha channel', function (done) {
sharp(fixtures.inputPngWithTransparency16bit)
.resize(32, 32)