From 7792e62d3c9e3f8b2a27e7e9cbbc8db2c584b682 Mon Sep 17 00:00:00 2001
From: Cosmic Linden <cosmic@lindenlab.com>
Date: Tue, 19 Mar 2024 16:03:57 -0700
Subject: secondlife/viewer-issues#82: Don't allow transparent texture terrain

---
 indra/llimage/llimage.cpp | 22 ++++++++++++++++++++++
 indra/llimage/llimage.h   |  2 ++
 2 files changed, 24 insertions(+)

(limited to 'indra/llimage')

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index acfc254b65..16609b60be 100644
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -990,6 +990,28 @@ void LLImageRaw::verticalFlip()
 }
 
 
+bool LLImageRaw::checkHasTransparentPixels()
+{
+    if (getComponents() != 4)
+    {
+        return false;
+    }
+
+    U8* data = getData();
+    U32 pixels = getWidth() * getHeight();
+
+    // check alpha channel for all 255
+    for (U32 i = 0; i < pixels; ++i)
+    {
+        if (data[i * 4 + 3] != 255)
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 bool LLImageRaw::optimizeAwayAlpha()
 {
     if (getComponents() == 4)
diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h
index fc8d62cc96..93b58b2356 100644
--- a/indra/llimage/llimage.h
+++ b/indra/llimage/llimage.h
@@ -210,6 +210,8 @@ public:
 
 	void verticalFlip();
     
+    // Returns true if the image is not fully opaque
+    bool checkHasTransparentPixels();
     // if the alpha channel is all 100% opaque, delete it
     // returns true if alpha channel was deleted
     bool optimizeAwayAlpha();
-- 
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