Moved the (currently very simplistic) code to check if a display_mode is valid into

it's own (static) method. In case setting the display mode fails, the returned mode
is now checked for validity as well.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21282 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/drawing/AccelerantHWInterface.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2006, Haiku.
+ * Copyright 2001-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -8,7 +8,7 @@
  *		Stephan Aßmus <superstippi@gmx.de>
  */
 
-/**	Accelerant based HWInterface implementation */
+/*!	Accelerant based HWInterface implementation */
 
 
 #include "AccelerantHWInterface.h"
@@ -438,8 +438,7 @@ AccelerantHWInterface::SetMode(const display_mode& mode)
 
 	// some safety checks
 	// TODO: more of those!
-	if (mode.virtual_width < 320
-		|| mode.virtual_height < 200)
+	if (!_IsValidMode(mode))
 		return B_BAD_VALUE;
 
 	// just try to set the mode - we let the graphics driver
@@ -466,6 +465,10 @@ AccelerantHWInterface::SetMode(const display_mode& mode)
 			if (fAccGetDisplayMode(&newMode) != B_OK)
 				return B_ERROR;
 
+			// TODO: check if the mode returned is valid!
+			if (!_IsValidMode(newMode))
+				return B_BAD_DATA;
+
 			// TODO: if the mode switch before fails as well, we must forbid
 			//	any uses of this class!
 			status = B_OK;
@@ -497,7 +500,8 @@ AccelerantHWInterface::SetMode(const display_mode& mode)
 	// update backbuffer if neccessary
 	if (!fBackBuffer || fBackBuffer->Width() != fDisplayMode.virtual_width
 		|| fBackBuffer->Height() != fDisplayMode.virtual_height
-		|| (fDisplayMode.space == B_RGB32 && fBackBuffer != NULL && !HWInterface::IsDoubleBuffered())) {
+		|| (fDisplayMode.space == B_RGB32 && fBackBuffer != NULL
+			&& !HWInterface::IsDoubleBuffered())) {
 		// NOTE: backbuffer is always B_RGBA32, this simplifies the
 		// drawing backend implementation tremendously for the time
 		// being. The color space conversion is handled in CopyBackToFront()

src/servers/app/drawing/HWInterface.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2005-2006, Haiku.
+ * Copyright 2005-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -23,13 +23,19 @@
 #include <unistd.h>
 
 
-HWInterfaceListener::HWInterfaceListener()		{}
-HWInterfaceListener::~HWInterfaceListener()		{}
+HWInterfaceListener::HWInterfaceListener()
+{
+}
+
+
+HWInterfaceListener::~HWInterfaceListener()
+{
+}
 
 
 // #pragma mark - HWInterface
 
-// constructor
+
 HWInterface::HWInterface(bool doubleBuffered)
 	: MultiLocker("hw interface lock"),
 	  fCursorAreaBackup(NULL),
@@ -956,3 +962,15 @@ HWInterface::_NotifyFrameBufferChanged()
 	}
 }
 
+
+/*static*/ bool
+HWInterface::_IsValidMode(const display_mode& mode)
+{
+	// TODO: more of those!
+	if (mode.virtual_width < 320
+		|| mode.virtual_height < 200)
+		return false;
+
+	return true;
+}
+

src/servers/app/drawing/HWInterface.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2005-2006, Haiku.
+ * Copyright 2005-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -180,6 +180,8 @@ class HWInterface : protected MultiLocker {
 
 			void				_NotifyFrameBufferChanged();
 
+	static	bool				_IsValidMode(const display_mode& mode);
+
 			// If we draw the cursor somewhere in the drawing buffer,
 			// we need to backup its contents before drawing, so that
 			// we can restore that area when the cursor needs to be