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psdWriter.spec.ts
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psdWriter.spec.ts
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import * as fs from 'fs';
import * as path from 'path';
import { expect } from 'chai';
import { loadCanvasFromFile, compareBuffers, createCanvas, compareCanvases } from './common';
import { Psd, WriteOptions, ReadOptions } from '../psd';
import { writePsd, writeSignature, getWriterBuffer, createWriter } from '../psdWriter';
import { readPsd, createReader } from '../psdReader';
import { writePsdBuffer } from '../index';
const layerImagesPath = path.join(__dirname, '..', '..', 'test', 'layer-images');
const writeFilesPath = path.join(__dirname, '..', '..', 'test', 'write');
const resultsFilesPath = path.join(__dirname, '..', '..', 'results');
function writeAndRead(psd: Psd, writeOptions: WriteOptions = {}, readOptions: ReadOptions = {}) {
const writer = createWriter();
writePsd(writer, psd, writeOptions);
const buffer = getWriterBuffer(writer);
const reader = createReader(buffer);
return readPsd(reader, { ...readOptions, throwForMissingFeatures: true, logMissingFeatures: true });
}
function tryLoadCanvasFromFile(filePath: string) {
try {
return loadCanvasFromFile(filePath);
} catch {
return undefined;
}
}
function loadPsdFromJSONAndPNGFiles(basePath: string) {
const psd: Psd = JSON.parse(fs.readFileSync(path.join(basePath, 'data.json'), 'utf8'));
psd.canvas = loadCanvasFromFile(path.join(basePath, 'canvas.png'));
psd.children!.forEach((l, i) => {
if (!l.children) {
l.canvas = tryLoadCanvasFromFile(path.join(basePath, `layer-${i}.png`));
if (l.mask) {
l.mask.canvas = loadCanvasFromFile(path.join(basePath, `layer-${i}-mask.png`));
}
}
});
psd.linkedFiles?.forEach(f => {
try {
f.data = fs.readFileSync(path.join(basePath, f.name));
} catch (e) { }
});
return psd;
}
describe('PsdWriter', () => {
it('does not throw if writing psd with empty canvas', () => {
const writer = createWriter();
const psd: Psd = {
width: 300,
height: 200
};
writePsd(writer, psd);
});
it('throws if passed invalid signature', () => {
const writer = createWriter();
for (const s of ['a', 'ab', 'abcde']) {
expect(() => writeSignature(writer, s), s).throw(`Invalid signature: '${s}'`);
}
});
it('throws exception if has layer with both children and canvas properties set', () => {
const writer = createWriter();
const psd: Psd = {
width: 300,
height: 200,
children: [{ children: [], canvas: createCanvas(300, 300) }]
};
expect(() => writePsd(writer, psd)).throw(`Invalid layer, cannot have both 'canvas' and 'children' properties`);
});
it('throws exception if has layer with both children and imageData properties set', () => {
const writer = createWriter();
const psd: Psd = {
width: 300,
height: 200,
children: [{ children: [], imageData: {} as any }]
};
expect(() => writePsd(writer, psd)).throw(`Invalid layer, cannot have both 'imageData' and 'children' properties`);
});
it('throws if psd has invalid width or height', () => {
const writer = createWriter();
const psd: Psd = {
width: -5,
height: 0,
};
expect(() => writePsd(writer, psd)).throw(`Invalid document size`);
});
const fullImage = loadCanvasFromFile(path.join(layerImagesPath, 'full.png'));
const transparentImage = loadCanvasFromFile(path.join(layerImagesPath, 'transparent.png'));
const trimmedImage = loadCanvasFromFile(path.join(layerImagesPath, 'trimmed.png'));
// const croppedImage = loadCanvasFromFile(path.join(layerImagesPath, 'cropped.png'));
// const paddedImage = loadCanvasFromFile(path.join(layerImagesPath, 'padded.png'));
describe('layer left, top, right, bottom handling', () => {
it('handles undefined left, top, right, bottom with layer image the same size as document', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'full-layer-image.png');
expect(layer.left).equal(0);
expect(layer.top).equal(0);
expect(layer.right).equal(300);
expect(layer.bottom).equal(200);
});
it('handles layer image larger than document', () => {
const psd: Psd = {
width: 100,
height: 50,
children: [
{
name: 'test',
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'oversized-layer-image.png');
expect(layer.left).equal(0);
expect(layer.top).equal(0);
expect(layer.right).equal(300);
expect(layer.bottom).equal(200);
});
it('aligns layer image to top left if layer image is smaller than document', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
canvas: trimmedImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(trimmedImage, layer.canvas, 'smaller-layer-image.png');
expect(layer.left).equal(0);
expect(layer.top).equal(0);
expect(layer.right).equal(192);
expect(layer.bottom).equal(68);
});
it('does not trim transparent layer image if trim option is not passed', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
canvas: transparentImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(transparentImage, layer.canvas, 'transparent-layer-image.png');
expect(layer.left).equal(0);
expect(layer.top).equal(0);
expect(layer.right).equal(300);
expect(layer.bottom).equal(200);
});
it('trims transparent layer image if trim option is set', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
canvas: transparentImage,
},
],
};
const result = writeAndRead(psd, { trimImageData: true });
const layer = result.children![0];
compareCanvases(trimmedImage, layer.canvas, 'trimmed-layer-image.png');
expect(layer.left).equal(51);
expect(layer.top).equal(65);
expect(layer.right).equal(243);
expect(layer.bottom).equal(133);
});
it('positions the layer at given left/top offsets', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
left: 50,
top: 30,
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'left-top-layer-image.png');
expect(layer.left).equal(50);
expect(layer.top).equal(30);
expect(layer.right).equal(350);
expect(layer.bottom).equal(230);
});
it('ignores right/bottom values', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
right: 200,
bottom: 100,
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'cropped-layer-image.png');
expect(layer.left).equal(0);
expect(layer.top).equal(0);
expect(layer.right).equal(300);
expect(layer.bottom).equal(200);
});
it('ignores larger right/bottom values', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
right: 400,
bottom: 250,
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'padded-layer-image.png');
expect(layer.left).equal(0);
expect(layer.top).equal(0);
expect(layer.right).equal(300);
expect(layer.bottom).equal(200);
});
it('ignores right/bottom values if they do not match canvas size', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
left: 50,
top: 50,
right: 50,
bottom: 50,
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'empty-layer-image.png');
expect(layer.left).equal(50);
expect(layer.top).equal(50);
expect(layer.right).equal(350);
expect(layer.bottom).equal(250);
});
it('ignores right/bottom values if they amount to negative size', () => {
const psd: Psd = {
width: 300,
height: 200,
children: [
{
name: 'test',
left: 50,
top: 50,
right: 0,
bottom: 0,
canvas: fullImage,
},
],
};
const result = writeAndRead(psd);
const layer = result.children![0];
compareCanvases(fullImage, layer.canvas, 'empty-layer-image.png');
expect(layer.left).equal(50);
expect(layer.top).equal(50);
expect(layer.right).equal(350);
expect(layer.bottom).equal(250);
});
});
// fs.readdirSync(writeFilesPath).filter(f => /group-blend/.test(f)).forEach(f => {
fs.readdirSync(writeFilesPath).filter(f => !/pattern/.test(f)).forEach(f => {
it(`writes PSD file (${f})`, () => {
const basePath = path.join(writeFilesPath, f);
const psd = loadPsdFromJSONAndPNGFiles(basePath);
const before = JSON.stringify(psd, replacer);
const buffer = writePsdBuffer(psd, { generateThumbnail: false, trimImageData: true, logMissingFeatures: true });
const after = JSON.stringify(psd, replacer);
expect(before).equal(after, 'psd object mutated');
fs.mkdirSync(resultsFilesPath, { recursive: true });
fs.writeFileSync(path.join(resultsFilesPath, `${f}.psd`), buffer);
// fs.writeFileSync(path.join(resultsFilesPath, `${f}.bin`), buffer);
const reader = createReader(buffer.buffer);
const result = readPsd(reader, { skipLayerImageData: true, logMissingFeatures: true, throwForMissingFeatures: true });
fs.writeFileSync(path.join(resultsFilesPath, `${f}-composite.png`), result.canvas!.toBuffer());
//compareCanvases(psd.canvas, result.canvas, 'composite image');
const expected = fs.readFileSync(path.join(basePath, 'expected.psd'));
compareBuffers(buffer, expected, `ArrayBufferPsdWriter`, 0);
});
});
});
function replacer(key: string, value: any) {
if (key === 'canvas') {
return '<canvas>';
} else {
return value;
}
}