feat(frame): give ROTATE quarter turns plus a fine straighten

src/utils/exportEngine.ts

@@ -9,7 +9,7 @@ import { TONE_SKSL, getToneUniforms, toneIsActive, toneUniformArray } from './to
 import { CINEMA_SKSL, getCinemaUniforms, cinemaIsActive } from './cinemaShader';
 import { drawFrameOnCanvas, polaroidLayout, POLAROID_CARD, POLAROID_WIN_W, wallframeLayout, WALLFRAME_W, WALLFRAME_H, WALLFRAME_LAND_W, WALLFRAME_LAND_H } from './frameUtils';
 import { patchJpegDpi } from './jpegDpi';
-import { rotateSkImage90 } from './skiaImage';
+import { applyPhotoRotation } from './skiaImage';
 
 export interface ExportResult {
   uri: string;
@@ -70,10 +70,12 @@ export interface ExportOptions {
   // visible through the opening, so the file matches the preview. Null /
   // undefined = centered 1x (the historical full-image draw).
   frameWindowZoom?: { s: number; u: number; v: number } | null;
-  // Library FRAME-tab rotation (90 = clockwise). Applied to the decoded source
-  // before the ratio crop, so the frame layout and cover maths see exactly the
-  // orientation the preview showed.
-  photoRotation?: 0 | 90;
+  // Library FRAME-tab rotation: the quarter turn in degrees clockwise
+  // (0/90/180/270) and the fine STRAIGHTEN offset in degrees, applied to the
+  // decoded source before the ratio crop, so the frame layout and cover maths
+  // see exactly the orientation the preview showed.
+  photoRotation?: 0 | 90 | 180 | 270;
+  photoStraighten?: number;
 }
 
 // Lightroom-style "Screen" output sharpen: subtle unsharp mask. A 3x3
@@ -139,7 +141,8 @@ export async function processAndExportPhoto(
     let skImage = skImage0;
     // FRAME-tab rotation first: the pixel-dimension swap then propagates
     // through the ratio crop, frame layout and cover maths unchanged.
-    if (options?.photoRotation === 90) skImage = rotateSkImage90(skImage) ?? skImage;
+    skImage =
+      applyPhotoRotation(skImage, options?.photoRotation, options?.photoStraighten) ?? skImage;
     let width = skImage.width();
     let height = skImage.height();
     // 1b. Aspect-ratio crop (composition): center-largest upright crop of the
@@ -445,7 +448,10 @@ export async function processAndExportPhoto(
       // Card proportions follow the UN-rotated source, so rotating the print
       // inside the frame never resizes the frame (same rule as the viewfinder).
       const frameAspect =
-        ratioWH ?? (options?.photoRotation === 90 ? height / width : width / height);
+        ratioWH ??
+        (options?.photoRotation === 90 || options?.photoRotation === 270
+          ? height / width
+          : width / height);
       const outH = Math.round(
         width * (POLAROID_CARD.sideMargin + POLAROID_CARD.bottomDeck) +
           (width * POLAROID_WIN_W) / frameAspect