From 802bf20f08420835c78244deba193e590bcd50de Mon Sep 17 00:00:00 2001
From: Pierre-Yves Nicolas <6371790+pynicolas@users.noreply.github.com>
Date: Wed, 25 Jun 2025 20:58:18 +0200
Subject: [PATCH] Resize the captured image before displaying it

---
 .../org/mydomain/myscan/DocumentDetection.kt  | 19 ++++++++++++++++++-
 .../java/org/mydomain/myscan/MainViewModel.kt |  3 +--
 .../java/org/mydomain/myscan/PdfGeneration.kt | 13 -------------
 3 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/app/src/main/java/org/mydomain/myscan/DocumentDetection.kt b/app/src/main/java/org/mydomain/myscan/DocumentDetection.kt
index 229660a..3962389 100644
--- a/app/src/main/java/org/mydomain/myscan/DocumentDetection.kt
+++ b/app/src/main/java/org/mydomain/myscan/DocumentDetection.kt
@@ -96,8 +96,25 @@ fun extractDocument(originalBitmap: Bitmap, quad: Quad, rotationDegrees: Int): B
     Imgproc.warpPerspective(inputMat, outputMat, transform, outputSize)
 
     val enhanced = enhanceCapturedImage(outputMat)
+    val rotated = rotate(enhanced, rotationDegrees)
+    val resized = resize(rotated, 1500.0)
 
-    return toBitmap(rotate(enhanced, rotationDegrees))
+    return toBitmap(resized)
+}
+
+fun resize(original: Mat, targetMax: Double): Mat {
+    val origSize = original.size()
+    if (max(origSize.width, origSize.height) < targetMax)
+        return original;
+    var targetWidth = targetMax
+    var targetHeight = origSize.height * targetWidth / origSize.width
+    if (origSize.width < origSize.height) {
+        targetHeight = targetMax
+        targetWidth = origSize.width * targetHeight / origSize.height
+    }
+    val result = Mat()
+    Imgproc.resize(original, result, Size(targetWidth, targetHeight), 0.0, 0.0, Imgproc.INTER_AREA)
+    return result
 }
 
 fun rotate(input: Mat, degrees: Int): Mat {
diff --git a/app/src/main/java/org/mydomain/myscan/MainViewModel.kt b/app/src/main/java/org/mydomain/myscan/MainViewModel.kt
index 4e1eca1..4615a9f 100644
--- a/app/src/main/java/org/mydomain/myscan/MainViewModel.kt
+++ b/app/src/main/java/org/mydomain/myscan/MainViewModel.kt
@@ -150,9 +150,8 @@ class MainViewModel(
         if (bitmap == null) {
             return
         }
-        val resized = resizeImage(bitmap)
         val outputStream = ByteArrayOutputStream()
-        resized.compress(Bitmap.CompressFormat.JPEG, quality, outputStream)
+        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream)
         val jpegBytes = outputStream.toByteArray()
         imageRepository.add(jpegBytes)
         _pageIds.value = imageRepository.imageIds()
diff --git a/app/src/main/java/org/mydomain/myscan/PdfGeneration.kt b/app/src/main/java/org/mydomain/myscan/PdfGeneration.kt
index 0b205cc..6ff6ccf 100644
--- a/app/src/main/java/org/mydomain/myscan/PdfGeneration.kt
+++ b/app/src/main/java/org/mydomain/myscan/PdfGeneration.kt
@@ -38,16 +38,3 @@ fun writePdfFromJpegs(jpegs: Sequence<ByteArray>, outputStream: OutputStream) {
         document.save(outputStream)
     }
 }
-
-fun resizeImage(original: Bitmap): Bitmap {
-    val targetMax = 1500
-    if (max(original.width, original.height) < targetMax)
-        return original;
-    var targetWidth = targetMax
-    var targetHeight = original.height * targetWidth / original.width
-    if (original.width < original.height) {
-        targetHeight = targetMax
-        targetWidth = original.width * targetHeight / original.height
-    }
-    return original.scale(targetWidth, targetHeight)
-}