From 17587adf52cd06d9521e54f0855918a7fe057080 Mon Sep 17 00:00:00 2001
From: ArthurKun <16458204+ArthurKun21@users.noreply.github.com>
Date: Fri, 31 Jan 2025 18:55:52 +0800
Subject: [PATCH] convert to nullable mat

---
 .../github/fate_grand_automata/imaging/DroidCvPattern.kt  | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/app/src/main/java/io/github/fate_grand_automata/imaging/DroidCvPattern.kt b/app/src/main/java/io/github/fate_grand_automata/imaging/DroidCvPattern.kt
index eaac85f25..d6965d16b 100644
--- a/app/src/main/java/io/github/fate_grand_automata/imaging/DroidCvPattern.kt
+++ b/app/src/main/java/io/github/fate_grand_automata/imaging/DroidCvPattern.kt
@@ -75,7 +75,7 @@ class DroidCvPattern(
         target.tag = tag
     }
 
-    private fun match(template: Pattern): Mat {
+    private fun match(template: Pattern): Mat? {
         val result = Mat()
         if (template is DroidCvPattern) {
             if (template.width <= width && template.height <= height) {
@@ -85,18 +85,18 @@ class DroidCvPattern(
                     result,
                     Imgproc.TM_CCOEFF_NORMED
                 )
+                return result
             } else {
                 Timber.v("Skipped matching $template: Region out of bounds")
             }
         }
-
-        return result
+        return null  
     }
 
     override fun findMatches(template: Pattern, similarity: Double) = sequence {
         val result = match(template)
 
-        result.use {
+        result?.use {
             while (true) {
                 val minMaxLocResult = Core.minMaxLoc(it)
                 val score = minMaxLocResult.maxVal