Image refactors and improvements

app/src/main/java/eu/steffo/twom/composables/avatar/AvatarImage.kt

@@ -11,7 +11,9 @@ import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.tooling.preview.Preview
 
 @Composable
-@Preview(widthDp = 40, heightDp = 40)
+@Preview(name = "Regular", widthDp = 40, heightDp = 40)
+@Preview(name = "Double font scale", widthDp = 40, heightDp = 40, fontScale = 2f)
+@Preview(name = "Quadruple font scale", widthDp = 40, heightDp = 40, fontScale = 4f)
 fun AvatarImage(
     modifier: Modifier = Modifier,
     bitmap: ImageBitmap? = null,

app/src/main/java/eu/steffo/twom/composables/avatar/AvatarPicker.kt

@@ -16,7 +16,9 @@ import eu.steffo.twom.utils.BitmapUtilities
 
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
-@Preview(widthDp = 40, heightDp = 40)
+@Preview(name = "Regular", widthDp = 40, heightDp = 40)
+@Preview(name = "Double font scale", widthDp = 40, heightDp = 40, fontScale = 2f)
+@Preview(name = "Quadruple font scale", widthDp = 40, heightDp = 40, fontScale = 4f)
 fun AvatarPicker(
     modifier: Modifier = Modifier,
     fallbackText: String = "?",
@@ -31,10 +33,7 @@ fun AvatarPicker(
         rememberLauncherForActivityResult(ActivityResultContracts.PickVisualMedia()) ImageSelect@{
             it ?: return@ImageSelect
 
-            val rawBitmap = BitmapUtilities.getRawBitmap(resolver, it) ?: return@ImageSelect
-            val orientation = BitmapUtilities.getOrientation(resolver, it) ?: return@ImageSelect
-
-            val correctedBitmap = BitmapUtilities.squareAndOrient(rawBitmap, orientation)
+            val correctedBitmap = BitmapUtilities.getCorrectedBitmap(resolver, it)
 
             onPick(correctedBitmap)
         }

app/src/main/java/eu/steffo/twom/composables/avatar/AvatarURL.kt

@@ -1,22 +1,14 @@
 package eu.steffo.twom.composables.avatar
 
-import android.graphics.Bitmap
-import android.graphics.BitmapFactory
-import android.util.Log
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.tooling.preview.Preview
-import eu.steffo.twom.composables.matrix.LocalSession
-import java.io.File
 
 @Composable
-@Preview(widthDp = 40, heightDp = 40)
+@Preview(name = "Regular", widthDp = 40, heightDp = 40)
+@Preview(name = "Double font scale", widthDp = 40, heightDp = 40, fontScale = 2f)
+@Preview(name = "Quadruple font scale", widthDp = 40, heightDp = 40, fontScale = 4f)
 fun AvatarURL(
     modifier: Modifier = Modifier,
     url: String? = "",
@@ -24,49 +16,9 @@ fun AvatarURL(
     contentDescription: String = "",
     alpha: Float = 1.0f,
 ) {
-    val session = LocalSession.current
-    var bitmap by remember { mutableStateOf<Bitmap?>(null) }
-
-    LaunchedEffect(session, url) GetAvatar@{
-        if (session == null) {
-            Log.d("AvatarURL", "Not doing anything, session is null.")
-            bitmap = null
-            return@GetAvatar
-        }
-        if (url == null) {
-            Log.d("AvatarURL", "URL is null, not downloading anything.")
-            bitmap = null
-            return@GetAvatar
-        }
-        if (url.isEmpty()) {
-            Log.d("AvatarURL", "URL is a zero-length string, not downloading anything.")
-            bitmap = null
-            return@GetAvatar
-        }
-
-        Log.d("AvatarURL", "Downloading avatar at: $url")
-        lateinit var avatarFile: File
-        try {
-            avatarFile = session.fileService().downloadFile(
-                fileName = "avatar",
-                url = url,
-                mimeType = null,
-                elementToDecrypt = null,
-            )
-        } catch (e: Throwable) {
-            Log.e("AvatarURL", "Unable to download avatar at: $url", e)
-            return@GetAvatar
-        }
-
-        // TODO: Should I check the MIME type? And the size of the image?
-        // FIXME: I feel this might be a race condition...
-        Log.d("AvatarURL", "File for $url is: $avatarFile")
-        bitmap = BitmapFactory.decodeFile(avatarFile.absolutePath)
-    }
-
     AvatarImage(
         modifier = modifier,
-        bitmap = bitmap?.asImageBitmap(),
+        bitmap = bitmapFromMatrixFile(url)?.asImageBitmap(),
         fallbackText = fallbackText,
         contentDescription = contentDescription,
         alpha = alpha,

app/src/main/java/eu/steffo/twom/composables/avatar/AvatarUser.kt

@@ -7,7 +7,9 @@ import org.matrix.android.sdk.api.session.user.model.User
 import org.matrix.android.sdk.api.util.toMatrixItem
 
 @Composable
-@Preview(widthDp = 40, heightDp = 40)
+@Preview(name = "Regular", widthDp = 40, heightDp = 40)
+@Preview(name = "Double font scale", widthDp = 40, heightDp = 40, fontScale = 2f)
+@Preview(name = "Quadruple font scale", widthDp = 40, heightDp = 40, fontScale = 4f)
 fun AvatarUser(
     modifier: Modifier = Modifier,
     user: User? = null,

app/src/main/java/eu/steffo/twom/composables/avatar/AvatarUserId.kt

@@ -12,7 +12,9 @@ import androidx.compose.ui.tooling.preview.Preview
 import eu.steffo.twom.composables.matrix.LocalSession
 
 @Composable
-@Preview(widthDp = 40, heightDp = 40)
+@Preview(name = "Regular", widthDp = 40, heightDp = 40)
+@Preview(name = "Double font scale", widthDp = 40, heightDp = 40, fontScale = 2f)
+@Preview(name = "Quadruple font scale", widthDp = 40, heightDp = 40, fontScale = 4f)
 fun AvatarUserId(
     modifier: Modifier = Modifier,
     userId: String = "",

app/src/main/java/eu/steffo/twom/composables/avatar/bitmapFromMatrixFile.kt

@@ -0,0 +1,76 @@
+package eu.steffo.twom.composables.avatar
+
+import android.graphics.Bitmap
+import android.util.Log
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.platform.LocalContext
+import androidx.core.net.toUri
+import eu.steffo.twom.composables.matrix.LocalSession
+import eu.steffo.twom.utils.BitmapUtilities
+import kotlinx.coroutines.CancellationException
+import org.matrix.android.sdk.api.util.md5
+import java.io.File
+
+const val TAG = "bitmapFromMatrixFile"
+
+@Composable
+fun bitmapFromMatrixFile(url: String? = null): Bitmap? {
+    val session = LocalSession.current
+    val resolver = LocalContext.current.contentResolver
+
+    var bitmap by remember { mutableStateOf<Bitmap?>(null) }
+
+    Log.v(TAG, "Compositing: $url")
+
+    // LaunchedEffect does not behave as expected: sometimes, the effect is cancelled, but not relaunched!
+    LaunchedEffect(session, url) Fetch@{
+        Log.v(TAG, "Launching: $url")
+
+        if (session == null) {
+            Log.d(TAG, "Session is null, clearing bitmap.")
+            bitmap = null
+            return@Fetch
+        }
+        if (url == null) {
+            Log.d(TAG, "URL is null, clearing bitmap.")
+            bitmap = null
+            return@Fetch
+        }
+        if (url.isEmpty()) {
+            Log.d(TAG, "URL is a zero-length string, clearing bitmap.")
+            bitmap = null
+            return@Fetch
+        }
+
+        Log.i(TAG, "Downloading file at: $url")
+        lateinit var avatarFile: File
+        try {
+            avatarFile = session.fileService().downloadFile(
+                fileName = url.md5(),
+                url = url,
+                mimeType = null,
+                elementToDecrypt = null,
+            )
+        } catch (e: CancellationException) {
+            // This makes sure no corrupt image is displayed, at least
+            Log.i(TAG, "Cancelled download of file at: $url", e)
+            bitmap = null
+            return@Fetch
+        } catch (e: Throwable) {
+            Log.e(TAG, "Unable to download file at: $url", e)
+            bitmap = null
+            return@Fetch
+        }
+
+        Log.d(TAG, "File for $url is: $avatarFile")
+
+        bitmap = BitmapUtilities.getCorrectedBitmap(resolver, avatarFile.toUri())
+    }
+
+    return bitmap
+}

app/src/main/java/eu/steffo/twom/utils/BitmapUtilities.kt

@@ -106,6 +106,12 @@ class BitmapUtilities {
             )
         }
 
+        fun getCorrectedBitmap(resolver: ContentResolver, uri: Uri): Bitmap? {
+            val rawBitmap = getRawBitmap(resolver, uri) ?: return null
+            val orientation = getOrientation(resolver, uri) ?: return null
+            return squareAndOrient(rawBitmap, orientation)
+        }
+
         fun bitmapToCache(id: String, bitmap: Bitmap): File {
             val file = File.createTempFile("bitmap_$id", ".jpg")
             file.outputStream().use {