Resize image stream dynamically to show image preview #919

CHANGELOG

@@ -3,6 +3,7 @@ KeePassDX(2.9.14)
  * Dark Themes #532 #714
  * Fix binary deduplication #715
  * Fix IconId #901
+ * Resize image stream dynamically to prevent slowdown #919
  * Small changes #795 #900 #903 #909 #914
 
 KeePassDX(2.9.13)

app/src/main/java/com/kunzisoft/keepass/activities/ImageViewerActivity.kt

@@ -34,6 +34,8 @@ import com.kunzisoft.keepass.R
 import com.kunzisoft.keepass.activities.lock.LockingActivity
 import com.kunzisoft.keepass.database.element.Attachment
 import com.kunzisoft.keepass.database.element.Database
+import com.kunzisoft.keepass.tasks.BinaryStreamManager
+import kotlin.math.max
 
 class ImageViewerActivity : LockingActivity() {
 
@@ -51,6 +53,12 @@ class ImageViewerActivity : LockingActivity() {
         val imageView: ImageView = findViewById(R.id.image_viewer_image)
         val progressView: View = findViewById(R.id.image_viewer_progress)
 
+        // Approximately, to not OOM and allow a zoom
+        val mImagePreviewMaxWidth = max(
+                resources.displayMetrics.widthPixels * 2,
+                resources.displayMetrics.heightPixels * 2
+        )
+
         try {
             progressView.visibility = View.VISIBLE
             intent.getParcelableExtra<Attachment>(IMAGE_ATTACHMENT_TAG)?.let { attachment ->
@@ -58,7 +66,11 @@ class ImageViewerActivity : LockingActivity() {
                 supportActionBar?.title = attachment.name
                 supportActionBar?.subtitle = Formatter.formatFileSize(this, attachment.binaryFile.length)
 
-                Attachment.loadBitmap(attachment, Database.getInstance().loadedCipherKey) { bitmapLoaded ->
+                BinaryStreamManager.loadBitmap(
+                        attachment.binaryFile,
+                        Database.getInstance().loadedCipherKey,
+                        mImagePreviewMaxWidth
+                ) { bitmapLoaded ->
                     if (bitmapLoaded == null) {
                         finish()
                     } else {

app/src/main/java/com/kunzisoft/keepass/adapters/EntryAttachmentsItemsAdapter.kt

@@ -32,13 +32,14 @@ import android.widget.TextView
 import androidx.recyclerview.widget.RecyclerView
 import com.kunzisoft.keepass.R
 import com.kunzisoft.keepass.activities.ImageViewerActivity
-import com.kunzisoft.keepass.database.element.Attachment
 import com.kunzisoft.keepass.database.element.Database
 import com.kunzisoft.keepass.database.element.database.CompressionAlgorithm
 import com.kunzisoft.keepass.model.AttachmentState
 import com.kunzisoft.keepass.model.EntryAttachmentState
 import com.kunzisoft.keepass.model.StreamDirection
+import com.kunzisoft.keepass.tasks.BinaryStreamManager
 import com.kunzisoft.keepass.view.expand
+import kotlin.math.max
 
 
 class EntryAttachmentsItemsAdapter(context: Context)
@@ -48,6 +49,11 @@ class EntryAttachmentsItemsAdapter(context: Context)
     var onItemClickListener: ((item: EntryAttachmentState)->Unit)? = null
     var onBinaryPreviewLoaded: ((item: EntryAttachmentState) -> Unit)? = null
 
+    // Approximately
+    private val mImagePreviewMaxWidth = max(
+            context.resources.displayMetrics.widthPixels,
+            context.resources.getDimensionPixelSize(R.dimen.item_file_info_height)
+    )
     private var mTitleColor: Int
 
     init {
@@ -76,7 +82,11 @@ class EntryAttachmentsItemsAdapter(context: Context)
                 if (entryAttachmentState.previewState == AttachmentState.NULL) {
                     entryAttachmentState.previewState = AttachmentState.IN_PROGRESS
                     // Load the bitmap image
-                    Attachment.loadBitmap(entryAttachmentState.attachment, binaryCipherKey) { imageLoaded ->
+                    BinaryStreamManager.loadBitmap(
+                            entryAttachmentState.attachment.binaryFile,
+                            binaryCipherKey,
+                            mImagePreviewMaxWidth
+                    ) { imageLoaded ->
                         if (imageLoaded == null) {
                             entryAttachmentState.previewState = AttachmentState.ERROR
                             visibility = View.GONE

app/src/main/java/com/kunzisoft/keepass/database/element/Attachment.kt

@@ -19,12 +19,10 @@
  */
 package com.kunzisoft.keepass.database.element
 
-import android.graphics.Bitmap
-import android.graphics.BitmapFactory
 import android.os.Parcel
 import android.os.Parcelable
 import com.kunzisoft.keepass.database.element.database.BinaryFile
-import kotlinx.coroutines.*
+
 
 data class Attachment(var name: String,
                       var binaryFile: BinaryFile) : Parcelable {
@@ -68,28 +66,5 @@ data class Attachment(var name: String,
         override fun newArray(size: Int): Array<Attachment?> {
             return arrayOfNulls(size)
         }
-
-        fun loadBitmap(attachment: Attachment,
-                       binaryCipherKey: Database.LoadedKey?,
-                       actionOnFinish: (Bitmap?) -> Unit) {
-            CoroutineScope(Dispatchers.Main).launch {
-                withContext(Dispatchers.IO) {
-                    val asyncResult: Deferred<Bitmap?> = async {
-                        runCatching {
-                            binaryCipherKey?.let { binaryKey ->
-                                var bitmap: Bitmap?
-                                attachment.binaryFile.getUnGzipInputDataStream(binaryKey).use { bitmapInputStream ->
-                                    bitmap = BitmapFactory.decodeStream(bitmapInputStream)
-                                }
-                                bitmap
-                            }
-                        }.getOrNull()
-                    }
-                    withContext(Dispatchers.Main) {
-                        actionOnFinish(asyncResult.await())
-                    }
-                }
-            }
-        }
     }
 }

app/src/main/java/com/kunzisoft/keepass/tasks/BinaryStreamManager.kt

@@ -9,10 +9,15 @@ import com.kunzisoft.keepass.database.element.Database
 import com.kunzisoft.keepass.database.element.database.BinaryFile
 import com.kunzisoft.keepass.stream.readAllBytes
 import com.kunzisoft.keepass.utils.UriUtil
+import kotlinx.coroutines.*
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.io.InputStream
 import java.io.OutputStream
+import kotlin.math.ceil
+import kotlin.math.ln
+import kotlin.math.max
+import kotlin.math.pow
 
 object BinaryStreamManager {
 
@@ -126,6 +131,57 @@ object BinaryStreamManager {
         return Bitmap.createScaledBitmap(this, width, height, true)
     }
 
+    fun loadBitmap(binaryFile: BinaryFile,
+                   binaryCipherKey: Database.LoadedKey?,
+                   maxWidth: Int,
+                   actionOnFinish: (Bitmap?) -> Unit) {
+        CoroutineScope(Dispatchers.Main).launch {
+            withContext(Dispatchers.IO) {
+                val asyncResult: Deferred<Bitmap?> = async {
+                    runCatching {
+                        binaryCipherKey?.let { binaryKey ->
+                            val bitmap: Bitmap? = decodeSampledBitmap(binaryFile,
+                                    binaryKey,
+                                    maxWidth)
+                            bitmap
+                        }
+                    }.getOrNull()
+                }
+                withContext(Dispatchers.Main) {
+                    actionOnFinish(asyncResult.await())
+                }
+            }
+        }
+    }
+
+    private fun decodeSampledBitmap(binaryFile: BinaryFile,
+                                    binaryCipherKey: Database.LoadedKey,
+                                    maxWidth: Int): Bitmap? {
+        // First decode with inJustDecodeBounds=true to check dimensions
+        return BitmapFactory.Options().run {
+            try {
+                inJustDecodeBounds = true
+                binaryFile.getUnGzipInputDataStream(binaryCipherKey).use {
+                    BitmapFactory.decodeStream(it, null, this)
+                }
+                // Calculate inSampleSize
+                var scale = 1
+                if (outHeight > maxWidth || outWidth > maxWidth) {
+                    scale = 2.0.pow(ceil(ln(maxWidth / max(outHeight, outWidth).toDouble()) / ln(0.5))).toInt()
+                }
+                inSampleSize = scale
+
+                // Decode bitmap with inSampleSize set
+                inJustDecodeBounds = false
+                binaryFile.getUnGzipInputDataStream(binaryCipherKey).use {
+                    BitmapFactory.decodeStream(it, null, this)
+                }
+            } catch (e: Exception) {
+                null
+            }
+        }
+    }
+
     private const val DEFAULT_ICON_WIDTH = 64
 
     private val TAG = BinaryStreamManager::class.java.name

app/src/main/res/layout/item_attachment.xml

@@ -31,7 +31,7 @@
     <androidx.appcompat.widget.AppCompatImageView
         android:id="@+id/item_attachment_thumbnail"
         android:layout_width="match_parent"
-        android:layout_height="144dp"
+        android:layout_height="@dimen/image_preview_height"
         android:layout_marginTop="12dp"
         android:layout_centerHorizontal="true"
         android:visibility="gone"

app/src/main/res/values/dimens.xml

@@ -21,6 +21,7 @@
 	<dimen name="default_margin">18dp</dimen>
     <dimen name="image_button_margin">8dp</dimen>
     <dimen name="image_list_margin">12dp</dimen>
+    <dimen name="image_preview_height">144dp</dimen>
     <dimen name="button_margin">6dp</dimen>
     <dimen name="card_view_margin">12dp</dimen>
     <dimen name="card_view_padding">14dp</dimen>

fastlane/metadata/android/en-US/changelogs/58.txt

@@ -2,4 +2,5 @@
  * Dark Themes #532 #714
  * Fix binary deduplication #715
  * Fix IconId #901
+ * Resize image stream dynamically to prevent slowdown #919
  * Small changes #795 #900 #903 #909 #914

fastlane/metadata/android/fr-FR/changelogs/58.txt

@@ -2,4 +2,5 @@
  * Thèmes sombres #532 #714
  * Correction de la duplication des binaires #715
  * Correction IconId #901
+ * Changement de taille dynamique du flux d'image pour prévenir les ralentissements #919
  * Petits changements #795 #900 #903 #909 #914