Merge pull request #64 from Decodatain/image-processing

Enhance image processing settings in AnkiConnect

src/lib/anki-connect/cropper.ts

@@ -1,6 +1,7 @@
 import { showSnackbar } from '$lib/util';
 import { writable } from 'svelte/store';
-import { blobToBase64 } from '.';
+import { blobToBase64, imageResize } from '.';
+import { Settings } from '$lib/settings';
 
 type CropperModal = {
   open: boolean;
@@ -34,7 +35,7 @@ function getRadianAngle(degreeValue: number) {
 
 export type Pixels = { width: number; height: number; x: number; y: number }
 
-export async function getCroppedImg(imageSrc: string, pixelCrop: Pixels, rotation = 0) {
+export async function getCroppedImg(imageSrc: string, pixelCrop: Pixels, settings: Settings, rotation = 0 ) {
   const image = await createImage(imageSrc);
   const canvas = new OffscreenCanvas(image.width, image.height);
   const ctx = canvas.getContext('2d');
@@ -71,8 +72,9 @@ export async function getCroppedImg(imageSrc: string, pixelCrop: Pixels, rotatio
     Math.round(0 - safeArea / 2 + image.width * 0.5 - pixelCrop.x),
     Math.round(0 - safeArea / 2 + image.height * 0.5 - pixelCrop.y)
   );
-
-  const blob = await canvas.convertToBlob({ type: 'image/webp' });
+  
+  await imageResize(canvas, ctx, settings.ankiConnectSettings.widthField, settings.ankiConnectSettings.heightField);
+  const blob = await canvas.convertToBlob({ type: 'image/webp', quality: settings.ankiConnectSettings.qualityField });
 
   return await blobToBase64(blob)
 }

src/lib/anki-connect/index.ts

@@ -1,4 +1,4 @@
-import { settings } from "$lib/settings";
+import { Settings, settings } from "$lib/settings";
 import { showSnackbar } from "$lib/util"
 import { get } from "svelte/store";
 
@@ -50,20 +50,44 @@ export async function blobToBase64(blob: Blob) {
   });
 }
 
-export async function imageToWebp(source: File) {
+export async function imageToWebp(source: File, settings: Settings) {
   const image = await createImageBitmap(source);
   const canvas = new OffscreenCanvas(image.width, image.height);
   const context = canvas.getContext("2d");
 
   if (context) {
     context.drawImage(image, 0, 0);
-    const blob = await canvas.convertToBlob({ type: 'image/webp' });
+    await imageResize(canvas, context, settings.ankiConnectSettings.widthField, settings.ankiConnectSettings.heightField);
+    const blob = await canvas.convertToBlob({ type: 'image/webp', quality: settings.ankiConnectSettings.qualityField });
     image.close();
 
     return await blobToBase64(blob);
   }
 }
 
+export async function imageResize(canvas: OffscreenCanvas,  ctx: OffscreenCanvasRenderingContext2D, maxWidth: number, maxHeight: number): Promise<OffscreenCanvas> {
+  return new Promise((resolve, reject) => {
+    const widthRatio = maxWidth <= 0 ? 1 : maxWidth / canvas.width;
+    const heightRatio = maxHeight <= 0 ? 1 : maxHeight / canvas.height;
+    const ratio = Math.min(1, Math.min(widthRatio, heightRatio));
+
+    if (ratio < 1) {
+        const newWidth = canvas.width * ratio;
+        const newHeight = canvas.height * ratio;
+        createImageBitmap(canvas, { resizeWidth: newWidth, resizeHeight: newHeight, resizeQuality: 'high' })
+            .then((sprite) => {
+                canvas.width = newWidth;
+                canvas.height = newHeight;
+                ctx.drawImage(sprite, 0, 0);
+                resolve(canvas);
+            })
+            .catch((e) => reject(e));
+    } else {
+        resolve(canvas);
+    }
+  });
+}
+
 export async function updateLastCard(imageData: string | null | undefined, sentence?: string) {
   const {
     overwriteImage,

src/lib/components/Reader/Cropper.svelte

@@ -37,7 +37,7 @@
   async function onCrop() {
     if ($cropperStore?.image && pixels) {
       loading = true;
-      const imageData = await getCroppedImg($cropperStore.image, pixels);
+      const imageData = await getCroppedImg($cropperStore.image, pixels, $settings);
       updateLastCard(imageData, $cropperStore.sentence);
       close();
     }

src/lib/components/Reader/QuickActions.svelte

@@ -40,7 +40,7 @@
         showCropper(URL.createObjectURL(src));
       } else {
         promptConfirmation('Add image to last created anki card?', async () => {
-          const imageData = await imageToWebp(src);
+          const imageData = await imageToWebp(src, $settings);
           updateLastCard(imageData);
         });
       }

src/lib/components/Reader/TextBoxes.svelte

@@ -54,7 +54,7 @@
         showCropper(URL.createObjectURL(src), sentence);
       } else {
         promptConfirmation('Add image to last created anki card?', async () => {
-          const imageData = await imageToWebp(src);
+          const imageData = await imageToWebp(src, $settings);
           updateLastCard(imageData, sentence);
         });
       }

src/lib/components/Settings/AnkiConnectSettings.svelte

@@ -13,6 +13,10 @@
   let pictureField = $settings.ankiConnectSettings.pictureField;
   let sentenceField = $settings.ankiConnectSettings.sentenceField;
 
+  let heightField = $settings.ankiConnectSettings.heightField;
+  let widthField = $settings.ankiConnectSettings.widthField;
+  let qualityField = $settings.ankiConnectSettings.qualityField;
+
   let triggerMethod = $settings.ankiConnectSettings.triggerMethod;
 
   const triggerOptions = [
@@ -90,5 +94,40 @@
         />
       </Label>
     </div>
+    <hr>
+    <h4>Quality Settings</h4>
+    <Helper>Allows you to customize the file size stored on your devices</Helper>
+    <div>
+      <Label>Max Height (0 = Ignore; 200 Recommended):</Label>
+      <Input
+        {disabled}
+        type="number"
+        bind:value={heightField}
+        on:change={() => {updateAnkiSetting('heightField', heightField); if (heightField < 0) heightField = 0;}}
+        min={0}
+      />
+    </div>
+    <div>
+      <Label>Max Width (0 = Ignore; 200 Recommended):</Label>
+      <Input
+        {disabled}
+        type="number"
+        bind:value={widthField}
+        on:change={() => {updateAnkiSetting('widthField', widthField); if (widthField < 0) widthField = 0;}}
+        min={0}
+      />
+    </div>
+    <div>
+      <Label>Quality (Between 0 and 1; 0.5 Recommended):</Label>
+      <Input
+        {disabled}
+        type="number"
+        bind:value={qualityField}
+        on:change={() => updateAnkiSetting('qualityField', qualityField)}
+        min={0}
+        max={1} 
+        step="0.1"
+      />
+    </div>
   </div>
 </AccordionItem>

src/lib/settings/settings.ts

@@ -28,6 +28,9 @@ export type AnkiConnectSettings = {
   enabled: boolean;
   pictureField: string;
   sentenceField: string;
+  heightField: number;
+  widthField: number;
+  qualityField: number;
   cropImage: boolean;
   overwriteImage: boolean;
   grabSentence: boolean;
@@ -98,6 +101,9 @@ const defaultSettings: Settings = {
     overwriteImage: true,
     pictureField: 'Picture',
     sentenceField: 'Sentence',
+    heightField: 0,
+    widthField: 0,
+    qualityField: 1,
     triggerMethod: 'both'
   }
 };