Feature(UI): add extract masked area from raster layers

invokeai/frontend/web/public/locales/en.json

@@ -2142,6 +2142,7 @@
         "clearCaches": "Clear Caches",
         "recalculateRects": "Recalculate Rects",
         "clipToBbox": "Clip Strokes to Bbox",
+        "extractRegion": "Extract Region",
         "outputOnlyMaskedRegions": "Output Only Generated Regions",
         "addLayer": "Add Layer",
         "duplicate": "Duplicate",

invokeai/frontend/web/src/features/controlLayers/components/InpaintMask/InpaintMaskMenuItems.tsx

@@ -10,6 +10,7 @@ import { CanvasEntityMenuItemsTransform } from 'features/controlLayers/component
 import { InpaintMaskMenuItemsAddModifiers } from 'features/controlLayers/components/InpaintMask/InpaintMaskMenuItemsAddModifiers';
 import { InpaintMaskMenuItemsConvertToSubMenu } from 'features/controlLayers/components/InpaintMask/InpaintMaskMenuItemsConvertToSubMenu';
 import { InpaintMaskMenuItemsCopyToSubMenu } from 'features/controlLayers/components/InpaintMask/InpaintMaskMenuItemsCopyToSubMenu';
+import { InpaintMaskMenuItemsExtractMaskedArea } from 'features/controlLayers/components/InpaintMask/InpaintMaskMenuItemsExtractMaskedArea';
 import { memo } from 'react';
 
 export const InpaintMaskMenuItems = memo(() => {
@@ -24,6 +25,7 @@ export const InpaintMaskMenuItems = memo(() => {
       <InpaintMaskMenuItemsAddModifiers />
       <MenuDivider />
       <CanvasEntityMenuItemsTransform />
+      <InpaintMaskMenuItemsExtractMaskedArea />
       <MenuDivider />
       <CanvasEntityMenuItemsMergeDown />
       <InpaintMaskMenuItemsCopyToSubMenu />

invokeai/frontend/web/src/features/controlLayers/components/InpaintMask/InpaintMaskMenuItemsExtractMaskedArea.tsx

@@ -0,0 +1,152 @@
+import { MenuItem } from '@invoke-ai/ui-library';
+import { logger } from 'app/logging/logger';
+import { useCanvasManager } from 'features/controlLayers/contexts/CanvasManagerProviderGate';
+import { useEntityIdentifierContext } from 'features/controlLayers/contexts/EntityIdentifierContext';
+import { useCanvasIsBusy } from 'features/controlLayers/hooks/useCanvasIsBusy';
+import { canvasToBlob, canvasToImageData } from 'features/controlLayers/konva/util';
+import type { CanvasImageState, Rect } from 'features/controlLayers/store/types';
+import { imageDTOToImageObject } from 'features/controlLayers/store/util';
+import { toast } from 'features/toast/toast';
+import { memo, useCallback } from 'react';
+import { useTranslation } from 'react-i18next';
+import { PiSelectionBackgroundBold } from 'react-icons/pi';
+import { serializeError } from 'serialize-error';
+import { uploadImage } from 'services/api/endpoints/images';
+
+const log = logger('canvas');
+
+export const InpaintMaskMenuItemsExtractMaskedArea = memo(() => {
+  const canvasManager = useCanvasManager();
+  const entityIdentifier = useEntityIdentifierContext('inpaint_mask');
+  const isBusy = useCanvasIsBusy();
+  const { t } = useTranslation();
+
+  const onExtract = useCallback(() => {
+    void (async () => {
+      // The active inpaint mask layer is required to build the mask used for extraction.
+      const maskAdapter = canvasManager.getAdapter(entityIdentifier);
+      if (!maskAdapter) {
+        log.error({ entityIdentifier }, 'Inpaint mask adapter not found when extracting masked area');
+        toast({ status: 'error', title: 'Unable to extract masked area.' });
+        return;
+      }
+
+      try {
+        // Use the mask's bounding box in stage coordinates to constrain the extraction region.
+        const maskPixelRect = maskAdapter.transformer.$pixelRect.get();
+        const maskPosition = maskAdapter.state.position;
+        const rect: Rect = {
+          x: Math.floor(maskPosition.x + maskPixelRect.x),
+          y: Math.floor(maskPosition.y + maskPixelRect.y),
+          width: Math.floor(maskPixelRect.width),
+          height: Math.floor(maskPixelRect.height),
+        };
+
+        // Abort when the canvas is effectively empty—no pixels to extract.
+        if (rect.width <= 0 || rect.height <= 0) {
+          toast({ status: 'warning', title: 'Canvas is empty.' });
+          return;
+        }
+
+        // Gather the visible raster layer adapters so we can composite them into a single bitmap.
+        const rasterAdapters = canvasManager.compositor.getVisibleAdaptersOfType('raster_layer');
+
+        let compositeImageData: ImageData;
+        if (rasterAdapters.length === 0) {
+          // No visible raster layers—create a transparent buffer that matches the canvas bounds.
+          compositeImageData = new ImageData(rect.width, rect.height);
+        } else {
+          // Render the visible raster layers into an offscreen canvas restricted to the canvas bounds.
+          const compositeCanvas = canvasManager.compositor.getCompositeCanvas(rasterAdapters, rect);
+          compositeImageData = canvasToImageData(compositeCanvas);
+        }
+
+        // Render the inpaint mask layer into a canvas so we have the alpha data that defines the mask.
+        const maskCanvas = maskAdapter.getCanvas(rect);
+        const maskImageData = canvasToImageData(maskCanvas);
+
+        if (maskImageData.width !== compositeImageData.width || maskImageData.height !== compositeImageData.height) {
+          // Bail out if the mask and composite buffers disagree on dimensions.
+          log.error(
+            {
+              maskDimensions: { width: maskImageData.width, height: maskImageData.height },
+              compositeDimensions: { width: compositeImageData.width, height: compositeImageData.height },
+            },
+            'Mask and composite dimensions did not match when extracting masked area'
+          );
+          toast({ status: 'error', title: 'Unable to extract masked area.' });
+          return;
+        }
+
+        const compositeArray = compositeImageData.data;
+        const maskArray = maskImageData.data;
+
+        if (!compositeArray || !maskArray) {
+          toast({ status: 'error', title: 'Cannot extract: image or mask data is missing.' });
+          return;
+        }
+
+        const outputArray = new Uint8ClampedArray(compositeArray.length);
+
+        // Apply the mask alpha channel to each pixel in the composite, keeping RGB untouched and only masking alpha.
+        for (let i = 0; i < compositeArray.length; i += 4) {
+          const maskAlpha = (maskArray[i + 3] ?? 0) / 255 || 0;
+          outputArray[i] = compositeArray[i] ?? 0;
+          outputArray[i + 1] = compositeArray[i + 1] ?? 0;
+          outputArray[i + 2] = compositeArray[i + 2] ?? 0;
+          outputArray[i + 3] = Math.round((compositeArray[i + 3] ?? 0) * maskAlpha);
+        }
+
+        // Package the masked pixels into an ImageData and draw them to an offscreen canvas.
+        const outputImageData = new ImageData(outputArray, rect.width, rect.height);
+        const outputCanvas = document.createElement('canvas');
+        outputCanvas.width = rect.width;
+        outputCanvas.height = rect.height;
+        const outputContext = outputCanvas.getContext('2d');
+
+        if (!outputContext) {
+          throw new Error('Failed to create canvas context for masked extraction');
+        }
+
+        outputContext.putImageData(outputImageData, 0, 0);
+
+        // Upload the extracted canvas region as a real image resource and returns image_name
+
+        const blob = await canvasToBlob(outputCanvas);
+
+        const imageDTO = await uploadImage({
+          file: new File([blob], 'inpaint-extract.png', { type: 'image/png' }),
+          image_category: 'general',
+          is_intermediate: true,
+          silent: true,
+        });
+
+        // Convert the uploaded image DTO into the canvas image state to avoid serializing the PNG in client state.
+        const imageState: CanvasImageState = imageDTOToImageObject(imageDTO);
+
+        // Insert the new raster layer so it appears at the top of raster layer goup.
+        const addAfter = canvasManager.stateApi.getRasterLayersState().entities.at(-1)?.id;
+
+        canvasManager.stateApi.addRasterLayer({
+          overrides: {
+            objects: [imageState],
+            position: { x: rect.x, y: rect.y },
+          },
+          isSelected: true,
+          addAfter,
+        });
+      } catch (error) {
+        log.error({ error: serializeError(error as Error) }, 'Failed to extract masked area to raster layer');
+        toast({ status: 'error', title: 'Unable to extract masked area.' });
+      }
+    })();
+  }, [canvasManager, entityIdentifier]);
+
+  return (
+    <MenuItem onClick={onExtract} icon={<PiSelectionBackgroundBold />} isDisabled={isBusy}>
+      {t('controlLayers.extractRegion')}
+    </MenuItem>
+  );
+});
+
+InpaintMaskMenuItemsExtractMaskedArea.displayName = 'InpaintMaskMenuItemsExtractMaskedArea';