add a new upscalingFactor when upscaling images

src/production/renderImageUpscaling.mts

@@ -8,12 +8,12 @@ export async function renderImageUpscaling(
   
   try {
     // note: this converts a base64 PNG to a base64 JPG (which is good, actually!)
-    response.assetUrl = await upscaleImage(response.assetUrl)
+    response.assetUrl = await upscaleImage(response.assetUrl, request.upscalingFactor)
     console.log(`upscaling worked on the first try!`)
   } catch (err) {
     console.error(`upscaling failed the first time.. let's try again..`)
     try {
-      response.assetUrl = await upscaleImage(response.assetUrl)
+      response.assetUrl = await upscaleImage(response.assetUrl, request.upscalingFactor)
       console.log(`upscaling worked on the second try!`)
     } catch (err) {
       console.error(`upscaling failed on the second attempt.. let's keep the low-res image then :|`)

src/types.mts

@@ -303,6 +303,14 @@ export interface RenderRequest {
   width: number
   height: number
 
+  // upscaling factor
+  // 0: no upscaling
+  // 1: no upscaling
+  // 2: 2x larger
+  // 3: 3x larger
+  // 4x: 4x larger, up to 4096x4096 (warning: a PNG of this size can be 50 Mb!)
+  upscalingFactor: number
+
   projection: ProjectionMode
 
   cache: CacheMode

src/utils/parseRenderRequest.mts

@@ -20,6 +20,8 @@ export function parseRenderRequest(request: RenderRequest) {
 
     // but obviously we will treat 0 as the random seed at a later stage
 
+    request.upscaling = getValidNumber(request.upscaling, 0, 4, 0)
+
     request.nbSteps = getValidNumber(request.nbSteps, 5, 50, 10)
 
     if (isVideo) {

src/utils/upscaleImage.mts

@@ -16,9 +16,15 @@ const instances: string[] = [
 //    at processTicksAndRejections (node:internal/process/task_queues:95:5)
 export async function upscaleImage(src: string, factor?: number) {
 
-  // bu default we do a 4X scale
-  const scaleFactor = getValidNumber(factor, 2, 10, 4)
-
+  // by default we do a 2X scale
+  // VideoQuest will use 4X
+  // 4 is really the max/limit, as this can generate PNGs of 50 Mb..
+  const scaleFactor = getValidNumber(factor, 0, 4, 2)
+
+  if (scaleFactor < 2) {
+    return src
+  }
+  
   const instance = instances.shift()
   instances.push(instance)