Add transparency options

src/pages/image/png/convert-jgp-to-png/index.tsx

@@ -1,11 +1,20 @@
 import { Box } from '@mui/material';
 import ToolInputAndResult from 'components/ToolInputAndResult';
 import ToolFileInput from 'components/input/ToolFileInput';
+import CheckboxWithDesc from 'components/options/CheckboxWithDesc';
+import ColorSelector from 'components/options/ColorSelector';
+import TextFieldWithDesc from 'components/options/TextFieldWithDesc';
+import ToolOptions from 'components/options/ToolOptions';
 import ToolFileResult from 'components/result/ToolFileResult';
+import Color from 'color';
 import React, { useState } from 'react';
 import * as Yup from 'yup';
 
-const initialValues = {};
+const initialValues = {
+  enableTransparency: false,
+  color: 'white',
+  similarity: '10'
+};
 const validationSchema = Yup.object({
   // splitSeparator: Yup.string().required('The separator is required')
 });
@@ -13,20 +22,24 @@ export default function ConvertJgpToPng() {
   const [input, setInput] = useState<File | null>(null);
   const [result, setResult] = useState<File | null>(null);
 
-  const onFileInputChange = (file: File): void => {
-    if (!file) return;
-    setInput(file);
-    convertJpgToPng(file);
-  };
-
-  const convertJpgToPng = async (file: File): Promise<void> => {
-    if (!file) return;
+  const compute = async (
+    optionsValues: typeof initialValues,
+    input: any
+  ): Promise<void> => {
+    if (!input) return;
 
+    const processImage = async (
+      file: File,
+      transparencyTransform?: {
+        color: [number, number, number];
+        similarity: number;
+      }
+    ) => {
       const canvas = document.createElement('canvas');
       const ctx = canvas.getContext('2d');
       if (ctx == null) return;
-
       const img = new Image();
+
       img.src = URL.createObjectURL(file);
       await img.decode();
 
@@ -34,6 +47,41 @@ export default function ConvertJgpToPng() {
       canvas.height = img.height;
       ctx.drawImage(img, 0, 0);
 
+      if (transparencyTransform) {
+        const { color, similarity } = transparencyTransform;
+
+        const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+        const data: Uint8ClampedArray = imageData.data;
+
+        const colorDistance = (
+          c1: [number, number, number],
+          c2: [number, number, number]
+        ) => {
+          return Math.sqrt(
+            Math.pow(c1[0] - c2[0], 2) +
+              Math.pow(c1[1] - c2[1], 2) +
+              Math.pow(c1[2] - c2[2], 2)
+          );
+        };
+        const maxColorDistance = Math.sqrt(
+          Math.pow(255, 2) + Math.pow(255, 2) + Math.pow(255, 2)
+        );
+        const similarityThreshold = (similarity / 100) * maxColorDistance;
+
+        for (let i = 0; i < data.length; i += 4) {
+          const currentColor: [number, number, number] = [
+            data[i],
+            data[i + 1],
+            data[i + 2]
+          ];
+          if (colorDistance(currentColor, color) <= similarityThreshold) {
+            data[i + 3] = 0;
+          }
+        }
+
+        ctx.putImageData(imageData, 0, 0);
+      }
+
       canvas.toBlob((blob) => {
         if (blob) {
           const newFile = new File([blob], file.name, {
@@ -44,13 +92,31 @@ export default function ConvertJgpToPng() {
       }, 'image/png');
     };
 
+    if (optionsValues.enableTransparency) {
+      let rgb: [number, number, number];
+      try {
+        //@ts-ignore
+        rgb = Color(optionsValues.color).rgb().array();
+      } catch (err) {
+        return;
+      }
+
+      processImage(input, {
+        color: rgb,
+        similarity: Number(optionsValues.similarity)
+      });
+    } else {
+      processImage(input);
+    }
+  };
+
   return (
     <Box>
       <ToolInputAndResult
         input={
           <ToolFileInput
             value={input}
-            onChange={onFileInputChange}
+            onChange={setInput}
             accept={['image/jpeg']}
             title={'Input JPG'}
           />
@@ -63,6 +129,40 @@ export default function ConvertJgpToPng() {
           />
         }
       />
+      <ToolOptions
+        compute={compute}
+        getGroups={({ values, updateField }) => [
+          {
+            title: 'From color and to color',
+            component: (
+              <Box>
+                <CheckboxWithDesc
+                  key="enableTransparency"
+                  title="PNG Transparency Color"
+                  checked={!!values.enableTransparency}
+                  onChange={(value) => updateField('enableTransparency', value)}
+                  description="Make the color below transparent."
+                />
+                <ColorSelector
+                  value={values.color}
+                  onChange={(val) => updateField('color', val)}
+                  description={'With this color (to color)'}
+                />
+                <TextFieldWithDesc
+                  value={values.similarity}
+                  onOwnChange={(val) => updateField('similarity', val)}
+                  description={
+                    'Match this % of similar. For example, 10% white will match white and a little bit of gray.'
+                  }
+                />
+              </Box>
+            )
+          }
+        ]}
+        initialValues={initialValues}
+        input={input}
+        validationSchema={validationSchema}
+      />
     </Box>
   );
 }