createResized(filePath, options) {
const suffix = options.suffix || 'resized';
const interpolation = options.interpolation || 'linear';
const format = options.format || 'png';
const dstPath = this.getPathWithoutExtension(filePath) + `_${suffix}.png`;
return lwip
.openAsync(filePath)
.then(image => {
const width = image.width();
const height = image.height();
const aspectRatio = width / height;
let resizeWidth = width;
let resizeHeight = height;
if (resizeWidth > options.width) {
resizeWidth = options.width;
resizeHeight = resizeWidth / aspectRatio;
} else if (resizeHeight > options.height) {
resizeHeight = options.height;
resizeWidth = resizeHeight * aspectRatio;
}
return image.resizeAsync(resizeWidth, resizeHeight, interpolation);
})
.then(resizedImage => resizedImage.writeFileAsync(dstPath, format))
.then(() => dstPath);
};
createCover(filePath, options) {
const suffix = options.suffix || 'cover';
const interpolation = options.interpolation || 'linear';
const format = options.format || 'png';
const dstPath = this.getPathWithoutExtension(filePath) + `_${suffix}.png`;
return lwip
.openAsync(filePath)
.then(image => image.coverAsync(options.width, options.height, interpolation))
.then(resizedImage => resizedImage.writeFileAsync(dstPath, format))
.then(() => dstPath);
}