feat: Scaled Bounding Box Dimensions now respect Aspect Ratio (#4463)

## What type of PR is this? (check all applicable)

- [x] Feature


## Have you discussed this change with the InvokeAI team?
- [x] Yes
      
## Description

Scale Before Processing Dimensions now respect the Aspect Ratio that is
locked in. This makes it way easier to control the setting when using it
with locked ratios on the canvas.

invokeai/frontend/web/src/features/canvas/store/canvasSlice.ts

@@ -235,10 +235,18 @@ export const canvasSlice = createSlice({
         state.boundingBoxDimensions.width,
         state.boundingBoxDimensions.height,
       ];
+      const [currScaledWidth, currScaledHeight] = [
+        state.scaledBoundingBoxDimensions.width,
+        state.scaledBoundingBoxDimensions.height,
+      ];
       state.boundingBoxDimensions = {
         width: currHeight,
         height: currWidth,
       };
+      state.scaledBoundingBoxDimensions = {
+        width: currScaledHeight,
+        height: currScaledWidth,
+      };
     },
     setBoundingBoxCoordinates: (state, action: PayloadAction<Vector2d>) => {
       state.boundingBoxCoordinates = floorCoordinates(action.payload);
@@ -788,6 +796,10 @@ export const canvasSlice = createSlice({
           state.boundingBoxDimensions.width / ratio,
           64
         );
+        state.scaledBoundingBoxDimensions.height = roundToMultiple(
+          state.scaledBoundingBoxDimensions.width / ratio,
+          64
+        );
       }
     });
   },

invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/InfillAndScaling/ParamScaledHeight.tsx

@@ -2,6 +2,7 @@ import { createSelector } from '@reduxjs/toolkit';
 import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
 import { defaultSelectorOptions } from 'app/store/util/defaultMemoizeOptions';
 import IAISlider from 'common/components/IAISlider';
+import { roundToMultiple } from 'common/util/roundDownToMultiple';
 import { canvasSelector } from 'features/canvas/store/canvasSelectors';
 import { setScaledBoundingBoxDimensions } from 'features/canvas/store/canvasSlice';
 import { generationSelector } from 'features/parameters/store/generationSelectors';
@@ -12,12 +13,13 @@ const selector = createSelector(
   [generationSelector, canvasSelector],
   (generation, canvas) => {
     const { scaledBoundingBoxDimensions, boundingBoxScaleMethod } = canvas;
-    const { model } = generation;
+    const { model, aspectRatio } = generation;
 
     return {
       model,
       scaledBoundingBoxDimensions,
       isManual: boundingBoxScaleMethod === 'manual',
+      aspectRatio,
     };
   },
   defaultSelectorOptions
@@ -25,7 +27,7 @@ const selector = createSelector(
 
 const ParamScaledHeight = () => {
   const dispatch = useAppDispatch();
-  const { model, isManual, scaledBoundingBoxDimensions } =
+  const { model, isManual, scaledBoundingBoxDimensions, aspectRatio } =
     useAppSelector(selector);
 
   const initial = ['sdxl', 'sdxl-refiner'].includes(model?.base_model as string)
@@ -35,19 +37,33 @@ const ParamScaledHeight = () => {
   const { t } = useTranslation();
 
   const handleChangeScaledHeight = (v: number) => {
+    let newWidth = scaledBoundingBoxDimensions.width;
+    const newHeight = Math.floor(v);
+
+    if (aspectRatio) {
+      newWidth = roundToMultiple(newHeight * aspectRatio, 64);
+    }
+
     dispatch(
       setScaledBoundingBoxDimensions({
-        ...scaledBoundingBoxDimensions,
-        height: Math.floor(v),
+        width: newWidth,
+        height: newHeight,
       })
     );
   };
 
   const handleResetScaledHeight = () => {
+    let resetWidth = scaledBoundingBoxDimensions.width;
+    const resetHeight = Math.floor(initial);
+
+    if (aspectRatio) {
+      resetWidth = roundToMultiple(resetHeight * aspectRatio, 64);
+    }
+
     dispatch(
       setScaledBoundingBoxDimensions({
-        ...scaledBoundingBoxDimensions,
-        height: Math.floor(initial),
+        width: resetWidth,
+        height: resetHeight,
       })
     );
   };

invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/InfillAndScaling/ParamScaledWidth.tsx

@@ -2,6 +2,7 @@ import { createSelector } from '@reduxjs/toolkit';
 import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
 import { defaultSelectorOptions } from 'app/store/util/defaultMemoizeOptions';
 import IAISlider from 'common/components/IAISlider';
+import { roundToMultiple } from 'common/util/roundDownToMultiple';
 import { canvasSelector } from 'features/canvas/store/canvasSelectors';
 import { setScaledBoundingBoxDimensions } from 'features/canvas/store/canvasSlice';
 import { generationSelector } from 'features/parameters/store/generationSelectors';
@@ -12,11 +13,12 @@ const selector = createSelector(
   [canvasSelector, generationSelector],
   (canvas, generation) => {
     const { boundingBoxScaleMethod, scaledBoundingBoxDimensions } = canvas;
-    const { model } = generation;
+    const { model, aspectRatio } = generation;
 
     return {
       model,
       scaledBoundingBoxDimensions,
+      aspectRatio,
       isManual: boundingBoxScaleMethod === 'manual',
     };
   },
@@ -25,7 +27,7 @@ const selector = createSelector(
 
 const ParamScaledWidth = () => {
   const dispatch = useAppDispatch();
-  const { model, isManual, scaledBoundingBoxDimensions } =
+  const { model, isManual, scaledBoundingBoxDimensions, aspectRatio } =
     useAppSelector(selector);
 
   const initial = ['sdxl', 'sdxl-refiner'].includes(model?.base_model as string)
@@ -35,19 +37,33 @@ const ParamScaledWidth = () => {
   const { t } = useTranslation();
 
   const handleChangeScaledWidth = (v: number) => {
+    const newWidth = Math.floor(v);
+    let newHeight = scaledBoundingBoxDimensions.height;
+
+    if (aspectRatio) {
+      newHeight = roundToMultiple(newWidth / aspectRatio, 64);
+    }
+
     dispatch(
       setScaledBoundingBoxDimensions({
-        ...scaledBoundingBoxDimensions,
-        width: Math.floor(v),
+        width: newWidth,
+        height: newHeight,
       })
     );
   };
 
   const handleResetScaledWidth = () => {
+    const resetWidth = Math.floor(initial);
+    let resetHeight = scaledBoundingBoxDimensions.height;
+
+    if (aspectRatio) {
+      resetHeight = roundToMultiple(resetWidth / aspectRatio, 64);
+    }
+
     dispatch(
       setScaledBoundingBoxDimensions({
-        ...scaledBoundingBoxDimensions,
-        width: Math.floor(initial),
+        width: resetWidth,
+        height: resetHeight,
       })
     );
   };