From 9a2cd3d85589d0fe0a8d11be4ab52cd68d6bf72a Mon Sep 17 00:00:00 2001
From: Jakub Grzywacz <jakub.grzywacz@swmansion.com>
Date: Wed, 24 Jul 2024 16:27:06 +0200
Subject: [PATCH] fix: color shift in FeColorMatrix on android (#2365)

# Summary

While debugging #2364 I've noticed that color shift in `FeColorMatrix`
on Android is wrong.
On web, elements 5, 10, 15, 20 is a color shift represented by number
where 1 mean full color shift, while on Android it's 255 for full color
shift.

## Test

```tsx
<svg width="180" height="180" viewBox="0 0 180 180">
  <rect width="180" height="180" fill="red" filter="url(#filter)"/>
  <filter id="filter">
    <feColorMatrix type="matrix" values="0 0 0 0 1
                                         0 1 0 0 0
                                         0 0 1 0 0
                                         0 0 0 1 0"/>
  </filter>
</svg>
```
---
 android/src/main/java/com/horcrux/svg/FeColorMatrixView.java | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/android/src/main/java/com/horcrux/svg/FeColorMatrixView.java b/android/src/main/java/com/horcrux/svg/FeColorMatrixView.java
index 532011a9..877ae263 100644
--- a/android/src/main/java/com/horcrux/svg/FeColorMatrixView.java
+++ b/android/src/main/java/com/horcrux/svg/FeColorMatrixView.java
@@ -44,7 +44,7 @@ class FeColorMatrixView extends FilterPrimitiveView {
         float[] rawMatrix = new float[mValues.size()];
 
         for (int i = 0; i < this.mValues.size(); i++) {
-          rawMatrix[i] = (float) this.mValues.getDouble(i);
+          rawMatrix[i] = (float) this.mValues.getDouble(i) * (i % 5 == 4 ? 255 : 1);
         }
 
         colorMatrix.set(rawMatrix);
@@ -88,8 +88,7 @@ class FeColorMatrixView extends FilterPrimitiveView {
       case LUMINANCE_TO_ALPHA:
         colorMatrix.set(
             new float[] {
-              0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.2125f, 0.7154f, 0.0721f, 0, 0, 0, 0, 0,
-              0, 1
+              0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.2125f, 0.7154f, 0.0721f, 0, 0,
             });
         break;
     }