From adbcfabcb1148009ab266b38c09275f6b01ba199 Mon Sep 17 00:00:00 2001
From: Kari Salminen
Date: Sat, 28 Mar 2009 16:07:56 +0000
Subject: Cine::Palette: Add empty() and isValid() functions.

svn-id: r39725
---
 engines/cine/pal.cpp | 11 +++++++++++
 engines/cine/pal.h   |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/engines/cine/pal.cpp b/engines/cine/pal.cpp
index 94c0f59dc0..3341da39c5 100644
--- a/engines/cine/pal.cpp
+++ b/engines/cine/pal.cpp
@@ -208,6 +208,10 @@ Palette &Palette::rotateRight(byte firstIndex, byte lastIndex) {
 	return *this;
 }
 
+bool Palette::empty() const {
+	return _colors.empty();
+}
+
 uint Palette::colorCount() const {
 	return _colors.size();
 }
@@ -222,6 +226,13 @@ Palette &Palette::fillWithBlack() {
 	return *this;
 }
 
+// TODO: Add better heuristic for checking whether the color format is valid
+bool Palette::isValid() const {
+	// Check that the color format has been actually set and not just default constructed.
+	// Also check that the alpha channel is discarded.
+	return _format != Graphics::PixelFormat() && _format.aLoss == 8;
+}
+
 Graphics::PixelFormat Palette::colorFormat() const {
 	return _format;
 }
diff --git a/engines/cine/pal.h b/engines/cine/pal.h
index 1f55a4f73f..f63073763c 100644
--- a/engines/cine/pal.h
+++ b/engines/cine/pal.h
@@ -139,10 +139,14 @@ public:
 	 */
 	Palette &saturatedAddNormalizedGray(Palette& output, byte firstIndex, byte lastIndex, signed grayDividend, signed grayDenominator);
 
+	bool empty() const;
 	uint colorCount() const;
 
 	Palette &fillWithBlack();
 
+	/*! \brief Is the palette valid? (Mostly just checks the color format for correctness) */
+	bool isValid() const;
+
 	/*! \brief The original color format in which this palette was loaded. */
 	Graphics::PixelFormat colorFormat() const;
 
-- 
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