From de7926e46f0a761fe23a132f8beca503a754a392 Mon Sep 17 00:00:00 2001
From: Thiago Pisani <pisani.thiago@gmail.com>
Date: Thu, 4 Jun 2020 13:12:08 -0300
Subject: [PATCH] Add support for image trimming

---
 index.js | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/index.js b/index.js
index 00f8127..c0c2d21 100644
--- a/index.js
+++ b/index.js
@@ -21,6 +21,7 @@ function Thumbor(securityKey, thumborServerUrl) {
   this.valignValue = null;
   this.cropValues = null;
   this.meta = false;
+  this.trimValue = null;
   this.filtersCalls = [];
 }
 
@@ -34,6 +35,9 @@ Thumbor.prototype = {
   CENTER: 'center',
   LEFT: 'left',
 
+  TOP_LEFT: 'top-left',
+  BOTTOM_RIGHT: 'bottom-right',
+
   /**
    * Set path of image
    * @param {String} imagePath [description]
@@ -75,6 +79,10 @@ Thumbor.prototype = {
       parts.push('meta');
     }
 
+    if (this.trimValue) {
+      parts.push(this.trimValue);
+    }
+
     if (this.cropValues) {
       parts.push(
         this.cropValues.left +
@@ -130,6 +138,34 @@ Thumbor.prototype = {
 
     return parts;
   },
+  /**
+   * Removes surrounding space in images using top-left pixel color unless specified otherwise.
+   * Overrides any previous call to `trim`.
+   * @param {String} orientation 'top-left', 'bottom-right'
+   * @param {Integer} tolerance between 0 and 442
+   */
+  trim: function(orientation, tolerance) {
+    var trimOpts = ['trim'];
+
+    if (orientation !== undefined) {
+      if (orientation === this.TOP_LEFT || orientation === this.BOTTOM_RIGHT) {
+        trimOpts.push(orientation);
+      } else {
+        throw new Error('Orientation must be top-left or bottom-right.');
+      }
+    }
+
+    if (tolerance !== undefined) {
+      if (tolerance > 0 && tolerance < 442) {
+        trimOpts.push(tolerance);
+      } else {
+        throw new Error('Tolerance must be between 0 and 442.');
+      }
+    }
+
+    this.trimValue = trimOpts.join(':');
+    return this;
+  },
   /**
    * Resize the image to the specified dimensions. Overrides any previous call
    * to `fitIn` or `resize`.