feat: cinematic seasonal atmosphere presets (spring/summer/autumn/winter) - enhances existing light with season tints, sun glow, fog veil

src/utils/exportEngine.ts

@@ -6,6 +6,7 @@ import { Asset } from 'expo-asset';
 import { Recipe, GPSInfo, FrameId } from '../types';
 import { getSkiaColorMatrix, applyExposureGain } from './colorUtils';
 import { TONE_SKSL, getToneUniforms, toneIsActive } from './toneShader';
+import { CINEMA_SKSL, getCinemaUniforms, cinemaIsActive } from './cinemaShader';
 import { drawFrameOnCanvas } from './frameUtils';
 import { patchJpegDpi } from './jpegDpi';
 
@@ -152,6 +153,31 @@ export async function processAndExportPhoto(
       }
     }
 
+    // 3c. Cinema seasonal atmosphere grade (chain: cinema -> tone -> image).
+    //     All-zero uniforms (no recipe.cinema) → skipped entirely.
+    const cinema = getCinemaUniforms(recipe.cinema);
+    let paintShader = toneShader;
+    if (cinema && cinemaIsActive(cinema.flat)) {
+      try {
+        const cinemaEffect = Skia.RuntimeEffect.Make(CINEMA_SKSL);
+        if (cinemaEffect) {
+          const child = toneShader ?? skImage.makeShaderOptions(
+            TileMode.Clamp,
+            TileMode.Clamp,
+            FilterMode.Linear,
+            MipmapMode.None
+          );
+          const cs = cinemaEffect.makeShaderWithChildren(cinema.flat, [child]);
+          if (cs) {
+            paintShader = cs;
+            paint.setShader(paintShader);
+          }
+        }
+      } catch (e) {
+        console.error('[export] CINEMA_SKSL failed - skipped: ' + e);
+      }
+    }
+
     // 4. Denoise / Clarity Image Filters (export-only enhancements)
     let imageFilter = null;
 
@@ -202,7 +228,7 @@ export async function processAndExportPhoto(
     // whole chain (tone → matrix → denoise/clarity) applies — but only when a
     // real shader was built; otherwise plain drawImage (never drawRect on a
     // shader-less paint, which paints solid color).
-    if (toneShader) {
+    if (paintShader) {
       canvas.drawRect(Skia.XYWHRect(0, 0, width, height), paint);
     } else {
       canvas.drawImage(skImage, 0, 0, paint);