fix: legacy picker for real photo GPS on Android 13+, watermark shows place + capture datetime

App.tsx

@@ -238,6 +238,14 @@ export default function App() {
       allowsEditing: false,
       quality: 1,
       exif: true,
+      // Android 13+ photo picker always returns a redacted cache copy with
+      // assetId=null — EXIF GPS stripped, MediaStore id lost → photo GPS is
+      // unreachable and we'd stamp the device's location instead. The legacy
+      // picker (ACTION_GET_CONTENT → DocumentsUI) hands back a
+      // com.android.providers.media.documents uri, so the MediaStore asset id
+      // survives AND (with ACCESS_MEDIA_LOCATION granted) the file is not
+      // redacted → tier-1 EXIF / tier-2 MediaStore both work.
+      legacy: Platform.OS === 'android' && useGeotag,
     });
 
     if (!result.canceled && result.assets && result.assets.length > 0) {

src/components/Viewfinder.tsx

@@ -24,7 +24,6 @@ import { Lock } from 'lucide-react-native';
 import { Recipe, GPSInfo, FrameId } from '../types';
 import { getSkiaColorMatrix, applyExposureGain } from '../utils/colorUtils';
 import { TONE_SKSL, getToneUniforms } from '../utils/toneShader';
-import { formatCoordinate } from '../utils/locationUtils';
 
 interface ViewfinderProps {
   mode: 'camera' | 'library';
@@ -481,19 +480,10 @@ export default function Viewfinder({
   const renderGPSWatermark = () => {
     if (!useGeotag || !gpsInfo || !customFont) return null;
 
-    const latStr = formatCoordinate(gpsInfo.latitude, 'lat');
-    const lonStr = formatCoordinate(gpsInfo.longitude, 'lon');
     const locationName = gpsInfo.locality || 'STREET VIEW';
-    const timestampStr = new Date(gpsInfo.timestamp).toLocaleDateString('vi-VN');
+    const d = new Date(gpsInfo.timestamp);
-    const sourceTag =
+    const pad = (n: number) => String(n).padStart(2, '0');
-      gpsInfo.source === 'exif'
+    const timestampStr = `${pad(d.getDate())}/${pad(d.getMonth() + 1)}/${d.getFullYear()} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
-        ? 'EXIF'
-        : gpsInfo.source === 'mediaLibrary'
-        ? 'MEDIA LIB'
-        : gpsInfo.source === 'device'
-        ? 'DEVICE GPS'
-        : null;
-    const captionSuffix = sourceTag ? ` | ${sourceTag}` : ' | SS 1/125 f/2.8';
 
     // Baseline above the bottom chrome (shutter rail) so the watermark stays
     // readable; polaroid frames push it further up onto the white area edge.
@@ -502,9 +492,8 @@ export default function Viewfinder({
 
     return (
       <Group>
-        <SkiaText x={xOffset} y={yOffset - 32} text={`📍 ${locationName}`} font={customFont} color="#f59e0b" />
+        <SkiaText x={xOffset} y={yOffset - 16} text={`📍 ${locationName}`} font={customFont} color="#f59e0b" />
-        <SkiaText x={xOffset} y={yOffset - 16} text={`${latStr}, ${lonStr}`} font={customFont} color="#f59e0b" />
+        <SkiaText x={xOffset} y={yOffset} text={timestampStr} font={customFont} color="#f59e0b" />
-        <SkiaText x={xOffset} y={yOffset} text={`${timestampStr}${captionSuffix}`} font={customFont} color="#f59e0b" />
       </Group>
     );
   };

src/utils/exportEngine.ts

@@ -7,7 +7,6 @@ import { Recipe, GPSInfo, FrameId } from '../types';
 import { getSkiaColorMatrix, applyExposureGain } from './colorUtils';
 import { TONE_SKSL, getToneUniforms, toneIsActive } from './toneShader';
 import { drawFrameOnCanvas } from './frameUtils';
-import { formatCoordinate } from './locationUtils';
 import { patchJpegDpi } from './jpegDpi';
 
 export interface ExportResult {
@@ -252,26 +251,16 @@ export async function processAndExportPhoto(
         const textPaint = Skia.Paint();
         textPaint.setColor(Skia.Color('#f59e0b')); // Amber 500
 
-        const latStr = formatCoordinate(gpsInfo.latitude, 'lat');
-        const lonStr = formatCoordinate(gpsInfo.longitude, 'lon');
         const locationName = gpsInfo.locality || 'STREET VIEW';
-        const timestampStr = new Date(gpsInfo.timestamp).toLocaleDateString('vi-VN');
+        const d = new Date(gpsInfo.timestamp);
-        const sourceTag =
+        const pad = (n: number) => String(n).padStart(2, '0');
-          gpsInfo.source === 'exif'
+        const timestampStr = `${pad(d.getDate())}/${pad(d.getMonth() + 1)}/${d.getFullYear()} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
-            ? 'EXIF'
-            : gpsInfo.source === 'mediaLibrary'
-            ? 'MEDIA LIB'
-            : gpsInfo.source === 'device'
-            ? 'DEVICE GPS'
-            : null;
-        const captionSuffix = sourceTag ? ` | ${sourceTag}` : ' | SS 1/125 f/2.8';
 
         const yOffset = height - (frameId === 'polaroid' ? height * 0.15 : fontSize * 1.5);
         const xOffset = frameId === 'polaroid' ? width * 0.08 : fontSize * 1.2;
 
-        canvas.drawText(`📍 ${locationName}`, xOffset, yOffset - fontSize * 2.2, textPaint, font);
+        canvas.drawText(`📍 ${locationName}`, xOffset, yOffset - fontSize * 1.4, textPaint, font);
-        canvas.drawText(`${latStr}, ${lonStr}`, xOffset, yOffset - fontSize * 1.1, textPaint, font);
+        canvas.drawText(timestampStr, xOffset, yOffset, textPaint, font);
-        canvas.drawText(`${timestampStr}${captionSuffix}`, xOffset, yOffset, textPaint, font);
       }
     }