From fa37aba7688f9234efffacdc5545f44ba2b59c0b Mon Sep 17 00:00:00 2001
From: Pavel Krajcevski <pavel@cs.unc.edu>
Date: Sat, 31 Aug 2013 16:37:58 -0400
Subject: [PATCH] Add comparison operator for pixels

---
 PVRTCEncoder/src/Pixel.cpp | 14 ++++++++++++++
 PVRTCEncoder/src/Pixel.h   |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/PVRTCEncoder/src/Pixel.cpp b/PVRTCEncoder/src/Pixel.cpp
index 8db81f6..d8504a3 100644
--- a/PVRTCEncoder/src/Pixel.cpp
+++ b/PVRTCEncoder/src/Pixel.cpp
@@ -163,5 +163,19 @@ namespace PVRTCC {
     return r;
   }
 
+  bool Pixel::operator==(const Pixel &other) const {
+    uint8 depths[4];
+    other.GetBitDepth(depths);
+
+    bool ok = true;
+    for(int i = 0; i < 4; i++) {
+      ok = ok && m_BitDepth[i] == depths[i];
+
+      uint8 mask = (1 << depths[i]) - 1;
+      const uint8 c = other.Component(i) & mask;
+      ok = ok && (c == (Component(i) & mask));
+    }
+    return ok;
+  }
 
 }  // namespace PVRTCC
diff --git a/PVRTCEncoder/src/Pixel.h b/PVRTCEncoder/src/Pixel.h
index 7c3a488..692eed3 100644
--- a/PVRTCEncoder/src/Pixel.h
+++ b/PVRTCEncoder/src/Pixel.h
@@ -111,6 +111,9 @@ class Pixel {
   // up in the most-significant byte.
   uint32 PackRGBA() const;
 
+  // Tests for equality by comparing the values and the bit depths.
+  bool operator==(const Pixel &) const;
+
  private:
   union {
     struct {