GOB: Add Pixel::isValid() and ConstPixel::isValid()

svn-id: r55573

2 files changed, 12 insertions, 0 deletions

diff --git a/engines/gob/surface.cpp b/engines/gob/surface.cpp
index d621ce5a97..58482a6424 100644
--- a/engines/gob/surface.cpp
+++ b/engines/gob/surface.cpp
@@ -103,6 +103,10 @@ void Pixel::set(uint32 p) {
 		*((uint16 *) _vidMem) = (uint16) p;
 }
 
+bool Pixel::isValid() const {
+	return (_vidMem >= _min) && (_vidMem < _max);
+}
+
 
 ConstPixel::ConstPixel(const byte *vidMem, uint8 bpp, const byte *min, const byte *max) :
 	_vidMem(vidMem), _bpp(bpp), _min(min), _max(max) {
@@ -157,6 +161,10 @@ uint32 ConstPixel::get() const {
 	return 0;
 }
 
+bool ConstPixel::isValid() const {
+	return (_vidMem >= _min) && (_vidMem < _max);
+}
+
 
 Surface::Surface(uint16 width, uint16 height, uint8 bpp, byte *vidMem) :
 	_width(width), _height(height), _bpp(bpp), _vidMem(vidMem) {
diff --git a/engines/gob/surface.h b/engines/gob/surface.h
index b8426989f3..a8d52c7b36 100644
--- a/engines/gob/surface.h
+++ b/engines/gob/surface.h
@@ -49,6 +49,8 @@ public:
 	uint32 get() const;
 	void set(uint32 p);
 
+	bool isValid() const;
+
 private:
 	byte *_vidMem;
 	byte *_min, *_max;
@@ -71,6 +73,8 @@ public:
 
 	uint32 get() const;
 
+	bool isValid() const;
+
 private:
 	const byte *_vidMem;
 	const byte *_min, *_max;