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Add trimOffsetLeft, trimOffsetTop to trim response #914

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Lovell Fuller 2018-10-02 20:16:00 +01:00
parent c431909f35
commit 0725378257
5 changed files with 20 additions and 0 deletions
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1
docs/api-resize.md
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@ -196,6 +196,7 @@ Returns **Sharp**
## trim
Trim "boring" pixels from all edges that contain values similar to the top-left pixel.
The `info` response Object will contain `trimOffsetLeft` and `trimOffsetTop` properties.
### Parameters

1
lib/resize.js
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@ -361,6 +361,7 @@ function extract (options) {
/**
* Trim "boring" pixels from all edges that contain values similar to the top-left pixel.
* The `info` response Object will contain `trimOffsetLeft` and `trimOffsetTop` properties.
* @param {Number} [threshold=10] the allowed difference from the top-left pixel, a number greater than zero.
* @returns {Sharp}
* @throws {Error} Invalid parameters

8
src/pipeline.cc
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@ -102,6 +102,8 @@ class PipelineWorker : public Nan::AsyncWorker {
// Trim
if (baton->trimThreshold > 0.0) {
image = sharp::Trim(image, baton->trimThreshold);
baton->trimOffsetLeft = image.xoffset();
baton->trimOffsetTop = image.yoffset();
}
// Pre extraction
@ -966,6 +968,12 @@ class PipelineWorker : public Nan::AsyncWorker {
Set(info, New("cropOffsetTop").ToLocalChecked(),
New<v8::Int32>(static_cast<int32_t>(baton->cropOffsetTop)));
}
if (baton->trimThreshold > 0.0) {
Set(info, New("trimOffsetLeft").ToLocalChecked(),
New<v8::Int32>(static_cast<int32_t>(baton->trimOffsetLeft)));
Set(info, New("trimOffsetTop").ToLocalChecked(),
New<v8::Int32>(static_cast<int32_t>(baton->trimOffsetTop)));
}
if (baton->bufferOutLength > 0) {
// Pass ownership of output data to Buffer instance

4
src/pipeline.h
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@ -82,6 +82,8 @@ struct PipelineBaton {
int threshold;
bool thresholdGrayscale;
double trimThreshold;
int trimOffsetLeft;
int trimOffsetTop;
double linearA;
double linearB;
double gamma;
@ -177,6 +179,8 @@ struct PipelineBaton {
threshold(0),
thresholdGrayscale(true),
trimThreshold(0.0),
trimOffsetLeft(0),
trimOffsetTop(0),
linearA(1.0),
linearB(0.0),
gamma(0.0),

6
test/unit/trim.js
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@ -16,6 +16,8 @@ describe('Trim borders', function () {
assert.strictEqual('png', info.format);
assert.strictEqual(450, info.width);
assert.strictEqual(322, info.height);
assert.strictEqual(-204, info.trimOffsetLeft);
assert.strictEqual(0, info.trimOffsetTop);
fixtures.assertSimilar(expected, data, done);
});
});
@ -29,6 +31,8 @@ describe('Trim borders', function () {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(300, info.width);
assert.strictEqual(-873, info.trimOffsetLeft);
assert.strictEqual(-554, info.trimOffsetTop);
fixtures.assertSimilar(expected, data, done);
});
});
@ -44,6 +48,8 @@ describe('Trim borders', function () {
assert.strictEqual(32, info.width);
assert.strictEqual(32, info.height);
assert.strictEqual(4, info.channels);
assert.strictEqual(-2, info.trimOffsetLeft);
assert.strictEqual(-2, info.trimOffsetTop);
fixtures.assertSimilar(fixtures.expected('trim-16bit-rgba.png'), data, done);
});
});