Fix rotation for pages migrated from previous versions of the app

app/src/main/java/org/fairscan/app/MainViewModel.kt

@@ -30,7 +30,6 @@ import kotlinx.coroutines.launch
 import org.fairscan.app.data.ImageRepository
 import org.fairscan.app.domain.CapturedPage
 import org.fairscan.app.domain.PageViewKey
-import org.fairscan.app.domain.Rotation
 import org.fairscan.app.ui.NavigationState
 import org.fairscan.app.ui.Screen
 import org.fairscan.app.ui.state.DocumentUiModel
@@ -47,7 +46,7 @@ class MainViewModel(val imageRepository: ImageRepository, launchMode: LaunchMode
         _pages.map { pages ->
             DocumentUiModel(
                 pageKeys = pages.map { p ->
-                    PageViewKey(p.id, p.metadata?.manualRotation?: Rotation.R0)
+                    PageViewKey(p.id, p.manualRotation)
                 }.toImmutableList(),
                 imageLoader = ::getBitmap,
                 thumbnailLoader = ::getThumbnail,

app/src/main/java/org/fairscan/app/data/ImageRepository.kt

@@ -122,8 +122,11 @@ class ImageRepository(
     }
 
     fun pages(): List<ScanPage> =
-        pages.pages().map {
-            ScanPage(it.id, it.toMetadata())
+        pages.pages().mapNotNull {
+            runCatching {
+                val manualRotation = Rotation.fromDegrees(it.manualRotationDegrees)
+                ScanPage(it.id, manualRotation, it.toMetadata())
+            }.getOrNull()
         }
 
     private fun page(id: String): PageV2? = pages.get(id)
@@ -140,7 +143,7 @@ class ImageRepository(
                 id = id,
                 quad = metadata.normalizedQuad.toSerializable(),
                 baseRotationDegrees = metadata.baseRotation.degrees,
-                manualRotationDegrees = metadata.manualRotation.degrees,
+                manualRotationDegrees = Rotation.R0.degrees,
                 isColored = metadata.isColored
             )
         )
@@ -321,13 +324,10 @@ fun NormalizedQuad.toQuad(): Quad =
     )
 
 fun PageV2.toMetadata(): PageMetadata? {
-    return runCatching {
-        if (quad == null || isColored == null) return null
-        PageMetadata(
-            quad.toQuad(),
-            Rotation.fromDegrees(baseRotationDegrees),
-            Rotation.fromDegrees(manualRotationDegrees),
-            isColored
-        )
-    }.getOrNull()
+    if (quad == null || isColored == null) return null
+    return PageMetadata(
+        quad.toQuad(),
+        Rotation.fromDegrees(baseRotationDegrees),
+        isColored
+    )
 }

app/src/main/java/org/fairscan/app/domain/ExportPreparation.kt

@@ -45,8 +45,9 @@ fun jpegsForExport(
         ExportQuality.HIGH -> pages.mapNotNull { page ->
             val sourceJpegBytes = imageRepository.sourceJpegBytes(page.id)
             val pageMetadata = page.metadata
+            val manualRotation = page.manualRotation
             if (sourceJpegBytes != null && pageMetadata != null)
-                prepareJpegForHigh(sourceJpegBytes, pageMetadata, exportQuality)
+                prepareJpegForHigh(sourceJpegBytes, pageMetadata, manualRotation, exportQuality)
             else
                 imageRepository.jpegBytes(page.id)
         }
@@ -73,6 +74,7 @@ fun resizeJpegBytesForMaxPixels(
 fun prepareJpegForHigh(
     sourceJpegBytes: ByteArray,
     pageMetadata: PageMetadata,
+    manualRotation: Rotation,
     exportQuality: ExportQuality,
 ): ByteArray? {
 
@@ -84,7 +86,7 @@ fun prepareJpegForHigh(
     val page = extractDocument(
         decoded,
         quad,
-        pageMetadata.baseRotation.add(pageMetadata.manualRotation).degrees,
+        pageMetadata.baseRotation.add(manualRotation).degrees,
         pageMetadata.isColored,
         exportQuality.maxPixels)
     val outJpegBytes = encodeJpeg(page, exportQuality.jpegQuality)

app/src/main/java/org/fairscan/app/domain/Page.kt

@@ -19,12 +19,12 @@ import org.fairscan.imageprocessing.Quad
 data class PageMetadata(
     val normalizedQuad: Quad,
     val baseRotation: Rotation,
-    val manualRotation: Rotation,
     val isColored: Boolean,
 )
 
 data class ScanPage(
     val id: String,
+    val manualRotation: Rotation,
     val metadata: PageMetadata?,
 )
 

app/src/main/java/org/fairscan/app/ui/screens/camera/CameraScreen.kt

@@ -473,7 +473,7 @@ fun CameraScreenPreviewWithProcessedImage() {
         CapturedPage(
             debugImage("gallica.bnf.fr-bpt6k5530456s-1.jpg"),
             debugImage("gallica.bnf.fr-bpt6k5530456s-1.jpg"),
-            PageMetadata(quad, R0, R0, false))))
+            PageMetadata(quad, R0, false))))
 }
 
 @Preview(showBackground = true, widthDp = 640, heightDp = 320)

app/src/main/java/org/fairscan/app/ui/screens/camera/CameraViewModel.kt

@@ -198,7 +198,7 @@ fun extractDocumentFromBitmap(
     outBgr.release()
     val normalizedQuad = quad.scaledTo(source.width, source.height, 1, 1)
     val baseRotation = Rotation.fromDegrees(rotationDegrees)
-    val metadata = PageMetadata(normalizedQuad, baseRotation, Rotation.R0, isColored)
+    val metadata = PageMetadata(normalizedQuad, baseRotation, isColored)
     return CapturedPage(outBitmap, source, metadata)
 }
 

app/src/test/java/org/fairscan/app/data/ImageRepositoryTest.kt

@@ -38,7 +38,7 @@ class ImageRepositoryTest {
     private var _filesDir: File? = null
 
     val quad1 = Quad(Point(.01, .02), Point(.1, .03), Point(.11, .12), Point(.03, .09))
-    val metadata1 = PageMetadata(quad1, R90, R0, true)
+    val metadata1 = PageMetadata(quad1, R90, true)
 
     fun getFilesDir(): File {
         if (_filesDir == null) {
@@ -73,11 +73,11 @@ class ImageRepositoryTest {
 
         val page = repo.pages().first()
         assertThat(page.id).isEqualTo(id)
+        assertThat(page.manualRotation).isEqualTo(R0)
         val metadata = page.metadata
         assertThat(metadata).isNotNull()
         assertThat(metadata!!.normalizedQuad).isEqualTo(quad1)
         assertThat(metadata.baseRotation).isEqualTo(metadata1.baseRotation)
-        assertThat(metadata.manualRotation).isEqualTo(metadata1.manualRotation)
         assertThat(metadata.isColored).isEqualTo(metadata1.isColored)
     }
 
@@ -192,19 +192,18 @@ class ImageRepositoryTest {
     fun rotate() {
         val repo = repo()
         repo.add(byteArrayOf(101, 102, 103), byteArrayOf(51), metadata1)
-        assertThat(metadata1.manualRotation).isEqualTo(R0)
         assertThat(repo.pages().last().metadata).isEqualTo(metadata1)
         val id = repo.pages().last().id
         repo.rotate(id, true)
-        assertThat(repo.pages().last().metadata).isEqualTo(metadata1.copy(manualRotation = R90))
+        assertThat(repo.pages().last().manualRotation).isEqualTo(R90)
         repo.rotate(id, true)
-        assertThat(repo.pages().last().metadata).isEqualTo(metadata1.copy(manualRotation = R180))
+        assertThat(repo.pages().last().manualRotation).isEqualTo(R180)
         repo.rotate(id, true)
-        assertThat(repo.pages().last().metadata).isEqualTo(metadata1.copy(manualRotation = R270))
+        assertThat(repo.pages().last().manualRotation).isEqualTo(R270)
         repo.rotate(id, true)
-        assertThat(repo.pages().last().metadata).isEqualTo(metadata1.copy(manualRotation = R0))
+        assertThat(repo.pages().last().manualRotation).isEqualTo(R0)
         repo.rotate(id, false)
-        assertThat(repo.pages().last().metadata).isEqualTo(metadata1.copy(manualRotation = R270))
+        assertThat(repo.pages().last().manualRotation).isEqualTo(R270)
     }
 
     @Test
@@ -248,8 +247,21 @@ class ImageRepositoryTest {
             assertThat(metadata).isNotNull()
             assertThat(metadata!!.isColored).isEqualTo(isColored)
         }
+    }
 
-        assertThat(PageV2("1", 42, 0, quad, true).toMetadata()).isNull()
+    @Test
+    fun `pages with invalid metadata should be skipped`() {
+        val bytes = byteArrayOf(105, 106, 107)
+
+        writeDocumentDotJson("""{"version":2, "pages":[{"id":"1", "manualRotationDegrees":90}]}""")
+        File(scanDir(), "1.jpg").writeBytes(byteArrayOf(101))
+        File(scanDir(), "1-90.jpg").writeBytes(bytes)
+        assertThat(repo().imageIds()).containsExactly("1")
+
+        writeDocumentDotJson("""{"version":2, "pages":[{"id":"1", "manualRotationDegrees":42}]}""")
+        File(scanDir(), "1.jpg").writeBytes(byteArrayOf(101))
+        File(scanDir(), "1-42.jpg").writeBytes(bytes)
+        assertThat(repo().imageIds()).isEmpty()
     }
 
     @Test