GRAPHICS: Ensure that _bufferedOutput is resized when the scale factor changes

graphics/scaler/edge.cpp

@@ -3604,13 +3604,13 @@ void EdgePlugin::internScale(const uint8 *srcPtr, uint32 srcPitch,
 
 uint EdgePlugin::increaseFactor() {
 	if (_factor == 2)
-		++_factor;
+		setFactor(_factor + 1);
 	return _factor;
 }
 
 uint EdgePlugin::decreaseFactor() {
 	if (_factor == 3)
-		--_factor;
+		setFactor(_factor - 1);
 	return _factor;
 }
 

graphics/scaler/hq.cpp

@@ -5067,13 +5067,13 @@ void HQPlugin::scaleIntern(const uint8 *srcPtr, uint32 srcPitch,
 
 uint HQPlugin::increaseFactor() {
 	if (_factor < 3)
-		++_factor;
+		setFactor(_factor + 1);
 	return _factor;
 }
 
 uint HQPlugin::decreaseFactor() {
 	if (_factor > 2)
-		--_factor;
+		setFactor(_factor - 1);
 	return _factor;
 }
 

graphics/scaler/normal.cpp

@@ -205,7 +205,7 @@ void NormalPlugin::scaleIntern(const uint8 *srcPtr, uint32 srcPitch,
 uint NormalPlugin::increaseFactor() {
 #ifdef USE_SCALERS
 	if (_factor < 4)
-		++_factor;
+		setFactor(_factor + 1);
 #endif
 	return _factor;
 }
@@ -213,7 +213,7 @@ uint NormalPlugin::increaseFactor() {
 uint NormalPlugin::decreaseFactor() {
 #ifdef USE_SCALERS
 	if (_factor > 1)
-		--_factor;
+		setFactor(_factor - 1);
 #endif
 	return _factor;
 }

graphics/scaler/scalebit.cpp

@@ -369,13 +369,13 @@ void AdvMamePlugin::scaleIntern(const uint8 *srcPtr, uint32 srcPitch,
 
 uint AdvMamePlugin::increaseFactor() {
 	if (_factor < 4)
-		++_factor;
+		setFactor(_factor + 1);
 	return _factor;
 }
 
 uint AdvMamePlugin::decreaseFactor() {
 	if (_factor > 2)
-		--_factor;
+		setFactor(_factor - 1);
 	return _factor;
 }
 

graphics/scalerplugin.cpp

@@ -60,7 +60,7 @@ void ScalerPluginObject::scale(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstP
 	}
 }
 
-SourceScaler::SourceScaler() : _oldSrc(NULL), _enable(false) {
+SourceScaler::SourceScaler() : _width(0), _height(0), _oldSrc(NULL), _enable(false) {
 }
 
 SourceScaler::~SourceScaler() {
@@ -77,13 +77,27 @@ void SourceScaler::setSource(const byte *src, uint pitch, int width, int height,
 	if (_oldSrc != NULL)
 		delete[] _oldSrc;
 
+	_width = width;
+	_height = height;
 	_padding = padding;
+
 	// Give _oldSrc same pitch
 	int size = (height + padding * 2) * pitch;
 	_oldSrc = new byte[size];
 	memset(_oldSrc, 0, size);
 
-	_bufferedOutput.create(width * _factor, height * _factor, _format);
+	_bufferedOutput.create(_width * _factor, _height * _factor, _format);
+}
+
+uint SourceScaler::setFactor(uint factor) {
+	uint oldFactor = _factor;
+	_factor = factor;
+
+	if (factor != oldFactor && _width != 0 && _height != 0) {
+		_bufferedOutput.create(_width * _factor, _height * _factor, _format);
+	}
+
+	return oldFactor;
 }
 
 void SourceScaler::scaleIntern(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr,

graphics/scalerplugin.h

@@ -167,6 +167,8 @@ public:
 
 	virtual void enableSource(bool enable) final { _enable = enable; }
 
+	virtual uint setFactor(uint factor) final;
+
 protected:
 
 	virtual void scaleIntern(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr,
@@ -186,7 +188,7 @@ protected:
 
 private:
 
-	int _padding;
+	int _width, _height, _padding;
 	bool _enable;
 	byte *_oldSrc;
 	Graphics::Surface _bufferedOutput;