77 lines
2.1 KiB
JavaScript
77 lines
2.1 KiB
JavaScript
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const gm = require('gm');
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const logger = require('winston');
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const imageMagick = gm.subClass({ imageMagick: true });
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const { getImageHeightAndWidth } = require('../../../utils/imageProcessing');
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module.exports = function transformImage(path, queryObj) {
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return new Promise((resolve, reject) => {
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let { h: cHeight = null } = queryObj;
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let { w: cWidth = null } = queryObj;
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let { t: transform = null } = queryObj;
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let { x: xOrigin = null } = queryObj;
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let { y: yOrigin = null } = queryObj;
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let oHeight,
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oWidth = null;
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try {
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getImageHeightAndWidth(path).then(hwarr => {
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oHeight = hwarr[0];
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oWidth = hwarr[1];
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// conditional logic here
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if (transform === 'crop') {
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resolve(_cropCenter(path, cWidth, cHeight, oWidth, oHeight));
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} else if (transform === 'stretch') {
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imageMagick(path)
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.resize(cWidth, cHeight, '!')
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.toBuffer(null, (err, buf) => {
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resolve(buf);
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});
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} else {
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// resize scaled
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imageMagick(path)
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.resize(cWidth, cHeight)
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.toBuffer(null, (err, buf) => {
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resolve(buf);
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});
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}
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});
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} catch (e) {
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logger.error(e);
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reject(e);
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}
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});
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};
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function _cropCenter(path, cropWidth, cropHeight, originalWidth, originalHeight) {
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let oAspect = originalWidth / originalHeight;
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let cAspect = cropWidth / cropHeight;
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let resizeX,
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resizeY,
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xpoint,
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ypoint = null;
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if (oAspect >= cAspect) {
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// if crop is narrower aspect than original
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resizeY = cropHeight;
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xpoint = (oAspect * cropHeight) / 2 - cropWidth / 2;
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ypoint = 0;
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} else {
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// if crop is wider aspect than original
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resizeX = cropWidth;
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xpoint = 0;
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ypoint = cropWidth / oAspect / 2 - cropHeight / 2;
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}
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return new Promise((resolve, reject) => {
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try {
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imageMagick(path)
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.resize(resizeX, resizeY)
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.crop(cropWidth, cropHeight, xpoint, ypoint)
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.toBuffer(null, (err, buf) => {
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resolve(buf);
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});
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} catch (e) {
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logger.error(e);
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reject(e);
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}
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});
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}
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